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1
Hede, Brian P. "Condition monitoring of tools in CNC turning." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/14320.
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The metal cutting industry today is highly automated and, as a step towards Europe's ability to compete on the world market, an increased level of automation can be expected in the future. Therefore, much attention has been paid to the use of automated monitoring systems within the maintenance strategies designed to prevent breakdown. This research focuses on the condition monitoring of cutting tools in CNC turning, using airborne acoustic emission, (AAE). A structured approach for overcoming the problems associated with changing cutting parameters is presented with good results. A reverse and novel approach in estimating gradual tool wear in longitudinal roughing has been made by predicting cutting parameters directly from the acoustics emitted from the process. Using the RMS as a representation of the energy in the signal, where the spectral distributions are working as divisional operators, it has been possible to accurately extract a representation of feed rate, depth of cut and cutting speed from the signal. Using a simplified relationship to estimate tangential cutting force, a virtual force can be calculated and related to a certain amount of flank wear using non-linear regression. Furthermore, this research presents a monitoring solution where disturbances are eliminated by recognising the sound signatures where it, afterwards, is possible to evaluate the reliability of the wear decision. This is done by describing irregularities in the signal , where surface parameters used on a sound waveform, combined in a neural network, has been used to trigger outputs for several defined classes of disturbances. An investigation of the two wear types flank and crater wear, has been conducted and is has been concluded, that although crater wear has an effect on the AAE, it is difficult to recognise this. AAE has shown to an efficient tool to detect flank wear, where a direct relationship is shown between the changes in the cutting parameters, tool wear and AAE. This approach has resulted in a precise monitoring so lution, where flank wear can be estimated within an error of I0%.
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Kučera, David. "CNC obrábění rotační součásti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417437.
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The diploma thesis concerns CNC machining of rotary part. The first part briefly introduces options of multipurpose CNC machines and robotized workplaces. The main body of the thesis analyses two production departments; one of them operated by a robotic manipulator. The conclusion summarises the accomplished results of the thesis.
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Mladenov, Dimitar M. "Assessment and compensation of errors in CNC turning." Thesis, University of Manchester, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488224.
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Dvořák, Kamil. "Výroba součásti na CNC soustruhu MORI SEIKI NL2000." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228214.
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A technology of a polishing jig which is made on a CNC lathe with the use of the GibbsCAM system. On the 3D model of the part a NC code of the program is made. This code is imported into the machine and verified for single production. After the production measurement is done. Economic evaluation of the production is calculated for the workpiece price.
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Mešina, Matej. "Možnosti systému Sinumerik 840D sl. při programování CNC obráběcích strojů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399364.
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The thesis deals with the design and production technology of the front hub for a mountain bike. The research focuses primarily on the various control systems of CNC machining apparatuses. The second chapter is devoted to the elemental differentiation of hubs, the concept of personal design of the hub, and the characteristics of the materials for its production and its verification using the FEM analysis. The third chapter deals with the design of a workpiece, instruments and the manufacturing process itself. The design of an NC program constructed in the SinuTrain 4.8. software is dealt with in the fourth chapter. The last part is devoted to the technical and economic evaluation of the proposed solution.
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Podloucký, Milan. "Konstrukce malého CNC soustruhu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230138.
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The aim of this master thesis is construction a small CNC lathe ideal for small series of mostly minor workpieces or for learning needs. In the first part of the work is carried out general literature search containing turning technology, tools for turning and the allocation of turning machines. There is also retrieval of small lathes located not only in our market. Based on research are selected technical parameters of the machine and carried out construction calculations. Also included is a 3D model of the entire assembly and assembly drawings of machine nodes.
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Vostřel, Jan. "CNC soustružení tvarových součástí z korozivzdorné oceli." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229259.
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This diploma thesis is focused on a CNC turning operation of form parts made of stainless steels. The first part of the diploma thesis is focused on a theoretical analysis of stainless steels material characteristics. The second part is focused on a concept of experiment of complex form experimental stainless steel components. In this thesis the new CNC technology is defined in a new operation system Sinumerik 840D/ShopTurn V06.04 with an application for a new multi-purpose turning centre SP280SY. The final part comprehends technical documentation, CNC programs of shaped components, their verification and overall photographic documentation.
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Hernandez, Manuel. "Process Optimization Towards the Development of an Automated CNC Monitoring System for a Simultaneous Turning and Boring Operation." Master's thesis, University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5298.
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Manufacturing operations generate revenue by adding value to material through machine work and the cost associated with part production hinders the maximum profit available. In order to remain competitive, companies invest in research to maximize profit and reduce waste of manufacturing operations. This results in cheaper products for the customer without sacrificing quality. The purpose of this research was to identify machine settings of an Okuma LC 40 Turning Center and optimize the cost of machining in terms of tool cost and energy consumption while maintaining part quality at a productive cycle time. Studying the relationship between energy consumption, tool life, and cycle time with the speed and feed settings through statistical Analysis of Variance (ANOVA) method will allow the production plant to make profitable financial decisions concerning simultaneous turning operation of forged chrome-alloy steel. The project was divided into three phases; the first phase began with a literature survey of sensors used in current manufacturing research and the adaptation of our sensors to the Okuma LC 40 turning center. Then, phase II used design of experiments to identify spindle speed and feedrate settings that optimize multiple responses related to the turning process. The result was a saving in energy consumption (kWh) by 11.8%, a saving in cutting time by 13.2% for a total cost reduction from $1.15 per tool pass to $1.075 per tool pass. Furthermore, this work provides the foundation for phase III to develop an intelligent monitoring system to provide real-time information about the state of the machine and tool. For a monitoring system to be implemented in production, it should utilize cost effective sensors and be nonintrusive to the cutting operation.<br>ID: 031001516; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Title from PDF title page (viewed August 16, 2013).; Thesis (M.S.M.E.)--University of Central Florida, 2012.; Includes bibliographical references (p. 58-60).<br>M.S.M.E.<br>Masters<br>Mechanical and Aerospace Engineering<br>Engineering and Computer Science<br>Mechanical Engineering; Mechanical Systems
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Novotný, Michal. "Technologie CNC výroby součásti z hliníkové slitiny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231248.
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The diploma thesis Technology of CNC production of aluminium alloy part is based on the particular specification of the company FP cz s.r.o. The core of the work lies in the proposal of production technology of the given part made from aluminium alloy which is machined by two universal CNC lathes with operating system FANUC. There is an introduction to the issue of characteristics and machinability of aluminium and its alloys because of coherence of the thesis. Practical part is focusing on the particular proposal of production technology which consists of the casting analysis, method of clamping on the chosen machines, choice of tools and verification of the production. There can be achieved effective production and significant time reduction with proposed technology.
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Kubášek, Pavel. "Technologie výroby zápustky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230790.
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The aim of the master´s thesis is to adjust the technology of machining of a die on the CNC lathe so that the total time for the production of a die could be reduced significantly and in this way also the production costs. The analyse of the technology of the machining of the inner part of the die is carried out and a change in the machining of this part is suggested. The new technology is elaborated in two variants when the CAD/CAM system is used for the creation of a programme in a variant and the machining cycles in the other. The technical and economical evaluation is performed at the end of the thesis.
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Hampl, Petr. "Návrh technologie součásti "kryt vstřikovače" v podmínkách malé strojírenské firmy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230365.
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Processing completely producting technological documentation for production part “INJECTOR COVER” for firm BM SERVICE (formerly ČKD Hradec Králové), including time schedule production of parts (parts which past welding and machining create demanded component part) and calculation production costs. Solving production process is concepted in two variation (actual and forecast study) for machines which are sorted from existing machinery and from now proposed machines. Estimation is designed for firm conditions introducing to the production with view for qualifications of workers, convention in firm and equipment.
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Paseka, Petr. "Výroba rotační součásti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241659.
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The master thesis is about creating technological process of production of a rotational part. The specified part is crankshaft and it is a new contract in manufacturing company. The goal is to design a CNC technology and verify the technology in production. There are used turning, milling and drilling methods in the machining process. There is a hexagon presssed in to the part, which requires a special preparation. Production requires the involvement of co-operation for nitriding surface treatment of the shaft. In the end a selling price is determined.
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Caha, Tomáš. "Volba a optimalizace řezných podmínek pro progresivní výrobní technologie." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231106.
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This thesis contents theoretical description of methods for choosing and optimization of cutting conditions for progressive machining technologies. Especially it is concerned on CNC machining. The aim of experimental part of work is to set cutting conditions and simultaneously to achieve the most economical solution under current production conditions of the company. The product must also comply with required quality, roughness of the surface and geometrical precision.
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Vencl, Petr. "Výroba hnací hřídele mlecího válce." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241906.
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This master’s thesis deals with production of grinding roller driveshaft in Bühler CZ s.r.o. in Žamberk. In the first part the attention is focused on analysis of current technology. Following chapters of thesis are focused on innovations to existing production technology, for example a technological test, CNC programming realization, machine times calculations or creating of technical documentation to ensure production of rotating part. The last chapter of the thesis focuses on economical assessment.
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Pokladník, Robert. "Návrh technologie součásti alternátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229900.
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This Diploma thesis deals with design technology of alternator claw pole. The technology is designed to achieve low production costs. The purpose is to prevent the transfer of manufacturing contract to countries with cheap manpower and low production costs. Technology design is done by selecting billets to the processing and economic evaluation. The dominant technology is a cutting operation that is performed on numerically controlled machines.
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Renuka, Shivaswaroop R. "Development of models of CNC machines - EMCO VMC100 and EMCO TURN120P in virtual NC." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178046654.
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Lučaník, Aleš. "Návrh a výroba příruby náboje zadního kola formule pomocí technologie CAD/CAM a dílenského CNC programování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230972.
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This master's thesis deals with design and machining of the flange hub rear wheel of the formula by using CAD/CAM technology and CNC workshop programming. The introductory part provides theoretical description and characteristic of turning and milling technology. Further work describes aluminium alloys with focus on material which was used as a blank for machined workpiece. The practical part deals with design of flange in CAD software Autodesk Inventor, design of turning strategies in system ShopTurn and design of milling strategies in software PowerMILL. The final part of this thesis specifies realization of manufacturing on CNC lathe and CNC machining center in company BOSCH DIESEL s.r.o. in Jihlava. Last chapter is focused on techno-economic aspects of manufacturing.
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Slavík, Daniel. "Možnosti systému Sinumerik při programování rotační strojní součásti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231372.
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This diploma thesis deals with a manufacture of rotating mechanical component on CNC lathe machine with Sinumerik control system. At first the chosen component is briefly described and then NC program is created in Sinutrain Operate 4.5 system. Afterwards the program is verified by simulation. Within the diploma thesis a technological documentation is elaborated that contains a new technological course of manufacture and a manufacture drawing of the component. The final part of this thesis is focused on technical-economic evaluation of newly designed manufacture with verification of cutting conditions and required output of the CNC machine. The outcome of the thesis defines an hour rate of CNC lathe and price of component that regards to newly presented manufacture.
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Horák, Vítězslav. "Konstrukce frézovací hlavy pro CNC soustruh s nastavitelným sklonem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417456.
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This thesis deals with design of CNC lathe milling head with B axis. Thesis includes research in CNC turning machines, their tool systems and overview of manufacturers of milling B axis. It also includes calculation of machining forces, design of spindle and design of B axis including necessary calculations. Part of this thesis is also 3D model and assembly drawing, 2 manufacturing drawings and list of items.
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Lánc, Kryštof. "Návrh technologie výroby rotační součásti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417074.
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The thesis is focused on concept of manufacturing technology for rotary part in case of mass production. The main aim was established suitable manufacturing technology for rotary part, choosing lathe machine, cutting tools and creating of NC program. The part of diploma thesis contains configuration of lathe machine in software Sinumerik. Document includes also the basic rules for developing NC program for two channels lathe.
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Soukupová, Veronika. "Optimalizace obráběcího procesu s průmyslovou aplikací na obráběcím centru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-432721.
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Tato diplomová práce byla vypracována v průmyslovém kontextu, během stáže ve firmě Metso. Zlepšení obráběcího procesu zajišťovacích šroubů bylo cílem této práce, aby byla umožněna budoucí automatizace zakládání obrobku do stroje. Zlepšení bylo zhodnoceno na základě úrovně autonomie během obrábění, eliminace neprogramovaných zastavení stroje operátorem a dostačujícího odvodu třísek. Implementace automatických systému do číslicově řízeného obráběcího centra umožňuje zvýšení produktivity. Před automatizováním obráběcího procesu však musí být proces optimalizován. Zejména dostatečná fragmentace třísek a jejich evakuace jsou klíčové. Dlouhé nedělené třísky můžou poškodit systémy jako například automatický měnič nástrojů, dopravník třísek nebo průmyslového robota. Dostatečná lámavost třísek může být zaručena správným výběrem technologie a strategie obrábění, výběrem řezného nástroje a řezných podmínek pro daný materiál obrobku.
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Almeida, Sergio Luis Rabelo de. "Modulo computacional, baseado em redes neurais, para a força de corte e para a rugosidade, em torneamento." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264227.
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Orientador: Olivio Novaski<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-07T14:11:27Z (GMT). No. of bitstreams: 1
Almeida_SergioLuisRabelode_D.pdf: 2212505 bytes, checksum: b547ce8e7c1a1faea1a6c7468054f32f (MD5)
Previous issue date: 2006<br>Resumo: Os softwares CAM existentes hoje no mercado permitem facilmente automatizar a geração de programas em linguagem CNC a partir de um modelo CAD. As trajetórias da ferramenta são calculadas respeitando-se a geometria final da peça. No entanto, estes programas, em geral, não disponibilizam recursos para corretamente estimar os parâmetros de usinagem (velocidade de corte, avanço, profundidade de usinagem), bem como sua influência em grandezas relevantes ao processo, como a força de corte e a rugosidade. Cria-se, assim, um descompasso com a realidade fisica do processo. Adicionalmente, tais programas não foram desenvolvidos com abordagem didática, possuindo pré-requisitos (interface CAD, domínio de idioma estrangeiro etc.) que dificultam ao estudante o fácil aprendizado de processos de usinagem a CNC. Este trabalho busca então abordar estes problemas vivenciados por escolas técnicas, desenvolvendo um módulo computacional, acoplado a um software CNC didático comercial para torneamento, que permita a predição de esforços de usinagem e rugosidade em tempo de programação CNC. Optou-se pela técnica da rede neural como núcleo, uma vez que permite aproximações bastante satisfatórias do processo de torneamento. Os resultados indicam que os modelos de rede neurais adotados (perceptron multi-camadas e função de base radial) aproximam de forma satisfatória o comportamento da força de corte e rugosidade, em função dos parâmetros de usinagem escolhidos (velocidade de corte, avanço e profundidade de corte) em uma série de casos de uso, utilizando-se o módulo computacional desenvolvido<br>Abstract: The majority of CAM software in the market allows the user to easily create the CNC program through CAD models. The tool paths are ca1culated in respect to the final piece geometry. However, these software do not permit, as part of their functionality, to estimate the cutting parameters (cutting speed, feed and depth of cut), as well as their influence in process variables such as cutting force and roughness. There is, in that sense, a gap between the geometrical and physical scenario of the machining process. Additionally, such software were not developed with didactical requirements, which makes difficult to the students the learning of the machining concepts using the CNC technology. The CAD and the foreign language interface are examples of such fact. This work targets to approach these remarks which are particularly common among the Technical Schools, developing a computational module, embedded in a commercial CNC didactic software, capable of predicting cutting forces (in roughing) and surface roughness (in finishing) at programming time. It was used a neural network technique as the base core, since it allows good estimative of turning process. The results indicate that the ANN topologies (Multilayer Perpectron and Radial Basis function) correlate satisfactorily with the experimental behavior of the cutting force and roughness regarding the input parameters chosen (cutting speed, feed and depth of cut) for different cases using the software prototype<br>Doutorado<br>Materiais e Processos de Fabricação<br>Doutor em Engenharia Mecânica
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Chen, Wei-Bin, and 陳維彬. "Multi-Tip Turning Tool Structure with CNC control." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/76766009813219996696.
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碩士<br>崑山科技大學<br>機械工程研究所<br>101<br>A CNC controlled Multi-Tip Tool Structure for fast turning process is presented in this study, to prolong overall tool life as well as to shorten machining time, it can also improve the quality of the process, especially for high-volume production. This Multi-Tip Lathe Tool structure can be installed in conventional lathe or CNC controlled automatic turning machines.
The main concept is to arrange more than one toll in radial direction, designed for easy installation and assembly. The tool tips are driven by a cam mechanism for adjustment of distance to the central axis. Installed on traditional lathe, it is suitable to machine cylindrical work-piece, especially for long and thin geometry. Instead of one cutting edge in regular turning process, several cutting tools are used simultaneously in this assembly. With this arrangement, radial cutting forces are balanced with each other and the steady or follower rests in a regular lathe can be eliminated, for long and thin work pieces.
Moreover, from the Multi-Tip Lathe Tool concept, the "Cutting-Force Balancing Follower-Rest with Automatic Adjustment” has been created. In the structure, a number of radial distributed rollers are arranged to balance the cutting force especially for cutting long and thin work-piece.
With the application of servo control technology, the mechanism is integrated into a CNC cutting machine. LabVIEW (National Instruments Corporation) is used to program the PLC control system, to achieve precise intelligent machining.
After repeated study/design/simulation/optimization/improvement/experiment, and through the digital control for work-pieces with predetermined shapes (cylindrical, steps, taper and curvature), the quality of the new mechanism is compared to traditional single tip tool cutting. The feasibility of the new structure has been proved, with stability, accuracy and surface finishing.
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Lin, Shi-Bin, and 林仕斌. "Development of Automatic Follower for CNC Turning Machine." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/41672942461509556917.
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碩士<br>崑山科技大學<br>機械工程研究所<br>102<br>Lathes are extensively used for machining in traditional process. Machine power generated has placed labor power during the process of industrial growth, because the structure of machinery is more stable. Turning process uses the component of rotation, cutting tool of straight-line motion and curvilinear motion to process and change its shape and size. After processing it will fit the requirement of design.
This research provides speedy turning technology and improves new type of tool carring structure. To keep the technology more precise and efficient, this new automatic tool carrier can enhance stability of component process, and reduce abrasion of cutting tools.
The creative structure includes a set of tool carrier and a follower. The main concept combines a cutting tool and a follower to turn into a simple structure. The distance between lathe tool and axle center is adjustable by slide structure. The whole mechanism fits traditional lathe to machine cylindrical component.
With this arrangement, radial cutting forces are balanced with each other and the steady or follower rests in a regular lathe can be eliminated, for long and thin work pieces. Make the tooling structure more compact and more feasible for multi-head CNC lathe or combo machining.
Experiment results confirmed the advantages of the innovative design to machine long-thin work pieces with stability as well as longer tooling life.
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Pan, Chang-Hsin, and 潘昌鑫. "GENERAL FUZZY OPTIMIZATION ON MULTI-OBJECTIVE CNC FINISH TURNING." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/85604064275037209811.
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碩士<br>大同大學<br>機械工程學系(所)<br>96<br>The issue of making parameter optimization of multi-objective CNC finish turning system regulation usually has highly complex non-linear relations, and the interactions are complex between the parameter and objective. Existing optimization research studied by a projection of the specific state, and more needed to make it by a large amount of repetitive operation and equipment. Because making parameter optimization of multi-objective CNC finish turning system regulation is really difficult, this paper chose multi-objective CNC finish turning system regulation to be topic, took cutting speed, cutting depth, feed rate and tool nose runoff as the factors of cutting, combined fuzzy linguistic analysis and “Technique for Order Preference by Similarity to Ideal Solution” (TOPSIS), and discussed the control parameter to influence of surface roughness, tool wearing, material removal rate, cutting noise (spreading objective) with FAHP. Utilize the linguistic inference way and operate without equipment to develop a set of general optimization mechanisms.
First, this research constructed the relativity stratum of quality and factor, analyzed multiple quality weight objectively by FAHP. Based on Fuzzy theory further, set up the linguistic rules for specific objective. After defuzzification by center of gravity method based on the definition of trapezoid membership function, this research got the quantization value of quality. Applied to the Taguchi orthogonal arrays further, obtained quality data by the experiment of linguistic and the one of turning. And then using TOPSIS was applied to combine multi-objective and to obtain the rank value. This research used TOPSIS to combine the general full factorial data done by Yi-Zhe Weng and Te-Chih Huang.To manifese, analyze, compare and correct the “scheme of general fuzzy optimization” on multi-objective CNC finish turning, this research strengthened the feasibility of the fuzzy linguistic analysis to the multi-objective optimization, and then discussed the application value of spreading objective.
The results shown that, the different is small between optimization parameter members of the linguistic experiment (The rank is NO.8) and turning experiment. Besides, the objective of surface roughness surpasses 38.7% and tool wear is better 7.9%. It represents close to actual experiment and proves that there are pretty good quality characteristics. Accord with and study the anticipated direction. After this section, this paper discusses popularizing quality. Because of increasing objective also simultaneously increasing the whole fuzzy scope, the rank is backwardness to 33. But still have good quality characteristics. In summary, this research presses most close to the actual demand in order to consider three objectives, and is able to be as a set of basis mechanism of economy and prospect “general optimization of multi-objective”. Without operating the equipment, this research provides not only to lower costs, to promote quality effectively, but to encourage positively competitiveness and development in CNC finish industry.
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Wang, Tzu-Kuei, and 王子癸. "Using CADD Software to Generate CNC Turning Programs Automatically." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/87586287575674384645.
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碩士<br>國立臺灣師範大學<br>工業教育學系<br>84<br>The main purpose of the study is to develop an interface
using a Computer Aided Design & Drawing (CADD) software for
transfering the lathe workpiece geometry into word address NC
codes automatically. A personal computer is connected to a CNC
lathe to archieve the integration of Computer Aided Design (CAD)
and Computer Aided Manufacturing (CAM). In this study,
AutoCAD for Windows R12 software is chosen as the working
platform. The program developed in the research is written in
AutoLISP language supported by AutoCAD. Dialog Control Language
（DCL） provided by AutoCAD system is also used for designing
the user''s interface. Four workpieces are designed based on
the characteristics of the lathe cutting. These workpieces
formed as the software test module. NC lathe parts programs are
generated automatically.The tool path stimulation and actual
cutting on the NC machine are used to check the correctness of
the research. The results of the test was promissing. It
demonstrated a compatible quality with the commercial CAD/CAM
software.Keywords：CNC Lathe, Numerical Control, CAD/CAM
integration, AutoCAD, tool path generation.
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Lee, Soo-Yen. "In-process tool condition monitoring systems in CNC turning operations /." 2006.
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Kuo, Keng-Tong, and 郭耿東. "Optimal Parameter Design of CNC Turning Tool Steel Using Taguchi Approach." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/89241069445632927394.
Full textAbstract:
碩士<br>國立高雄第一科技大學<br>機械與自動化工程所<br>91<br>Abstract
The tool steel is widely applied to mold and die, it is a kind of hardly cutting materials. The turning is usually used to machine columnar shape mold parts. That is important to select parameter before machining process, and it will directly affect product quality after machining process, if we can finish parameter design work quickly and exactly that will not only reduce manufacture time but also improve product quality.
The research use Taguchi method, take two different hardness tool steels (SKD11 and SKD61) to make Turning experiment with CNC lathe, then use precision measuring instruments to measure and record three quality characteristics (Section Area, Surface Roughness, and Roundness) results, apply parameter design with models of Section Area vs. Section Area Single Dynamic Quality Characteristic and Minimum Quality Loss Multiple Quality Characteristic, expect to rise the Geometric Accuracy of workpiece.
Experimental results showed that Taguchi method provides a simple, systematic, and efficient methodology for the optimization of the turning parameters. Turning with the optimization of Section Area vs. Section Area Dynamic Quality Characteristic model, the variation range reduces to 37.87%, and the Surface Roughness of workpiece are much better than initial condition. The result of Minimum Quality Loss Multiple Quality Characteristic model will be widely used to signal and multiple quality characteristic turning process. For much useful, the study have written operating interface program with Visual Basic software for that, it is helpful to get the optimum turning condition quickly and exactly for different quality intended.
Mold manufactures can refer above multiple quality characteristic model to establish computer parameter design database, the useful technical database will let the parameter design work become easily, quickly, and exactly. Furthermore effectively rise mold quality and reduce manufacture time in the same cost.
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Sanghi, Deepak. "Generalized process plan optimization problem for four-axis CNC turning centers." 1997. http://catalog.hathitrust.org/api/volumes/oclc/37558835.html.
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Thesis (M.S.)--University of Wisconsin--Madison, 1997.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 172-176).
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Chiou, Hwang-Sheng, and 邱煌昇. "Adaptive and Fuzzy Logic Control for C-axis of CNC Turning Centers." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/74059127620548941051.
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碩士<br>國立中興大學<br>機械工程學系<br>85<br>In this thesis, we consider the controller design for the
precision position and low-speed operation of the C-axis of a
CNC turning center. When the spindle system is undergoing slow
speed motion, serious effectsof nonlinear friction and
transmission flexibility might dominate its control design. Two
kinds of control strategy are suggested. First, usual PD
controller with feedforward disturbance compensation using on-
line disturbance estimators is proposed. For improving the
transient performanceof set point control, a fuzzy logic system
for brake control is further suggested. Second, a stable
adaptive control with fuzzy tuning adaptation gains , based on
Lyapunov stability theory, is proposed for improvingperformance.
The proposed strategies are well tested via computer
simulations.In the Simulations, AC induction motor drived C-axis
including mechanical transmission flexibility and dynamic
friction model, suggested by Canudasde Wit et al. in 1995, is
considered. The critical speed of a C-axis thatrepresents
system's lower performance bound can be greatly lowered usingthe
proposed adaptive control with fuzzy tuning adaptation gains.
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Kuo, Nai-hung, and 郭乃宏. "Optimal Parameter Design of CNC Turning Tool Steel Using Taguchi Dynamic Method." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/40648614969330159117.
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碩士<br>國立高雄第一科技大學<br>機械與自動化工程所<br>91<br>For manufactures making mold and die, knowing the date of delivery and accurate size of the product can produce profits and create competition. However, there are many different characteristics of tool steels. The turning process will be impacted by chip obstacle and tool wear, causing the quality of the items to be unstable and have size mistakes. Our study uses the dynamic characteristic of the Taguchi method to develop a high dimensional accuracy for the CNC turning tool process, and a two-phase parameter design for the best manufacturing result.
The optimization of creating high dimensional accuracy in the CNC turning tool process is designed dimension vs. dimension ideal in the function model. It''s choices in coolant, cutting speed, feed, death of cutting, tool material, chip breaker, nose radius, insert shape for control factors and be experimented by an L18 orthogonal array. The often used tool materials of SKD-11 and SKD-61 are the error factors in this process. The CNC turning process system uses four different diameters for the input signal. According to the result of the experiment, the most important of impact factors are the tool material and the feed. The optimization of turning process descreases the variation range to 45.6%. It shows that surface roughness in the workpiece are much better than in the initial situation. It is the best in terms of process item accuracies and improves roughness of the surface. It has proved that the mold and die manufacturing quality can be improved.
The two-phase parameter design establishes the ideal functions for double signals, input volume removal vs. machining time and dimension vs. dimension. The first step of seeking machining time robust quality, and the second step of making changes in product size, will give the best size accuracy. According to the experiment result, the feed and cutting speed will impact the machining time. Also choosing a resistant variation referencing parameters, the assembling of resistant variation, and regressive the data of workpiece, can make increase the accuracy of the workpiece. It also can have the machining time robust and for size accuracy of workpiece.
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Huang, Wei-Cheng, and 黃偉誠. "Research on the Surface Finish of Al-6061T6 on a CNC Turning Machine." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/e5jg9s.
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碩士<br>國立臺灣科技大學<br>機械工程系<br>105<br>The purpose of this research is to study the surface finishing processes on the CNC turning machine for Al-6061T6, to improve its surface roughness. In order to improve surface roughness, the Taguchi’s L9 matrix experiments have been carried out to determine the suitable combination of the process parameters. By using S/N Ratio, the ANOVA analysis and the verification tests, the appropriate ball burnishing and ball polishing process parameters have been determined. According to the experimental results, the determined appropriate ball burnishing parameters were as follows : burnishing force of 60 N, feed rate of 0.05 mm/rev, spindle speed of 180 rpm and use of machine oil (cst68 @ 40ﾟC) as lubricant. The turned surface roughness of the test specimen could be improved from Ra 1.0 μm to Ra 0.147 μm. The appropriate ball polishing parameters were as follows : depth of penetration of 100 μm (1.59N), feed rate of 0.02 mm/rev, polishing speed of 15,000 rpm and spindle speed of 60 rpm. The burnished surface roughness could be improved from Ra 0.147 μm to Ra 0.097 μm. Applying these suitable parameters to the taper workpiece, the surface roughness of Ra 0.09 μm could be obtained.
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Huang, Wei-Xiang, and 黃暐翔. "A Piezoelectric Actuated Vibration-Assisted Chip Breaking Tool Design for CNC Turning Process." Thesis, 2019. http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5311067%22.&searchmode=basic.
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碩士<br>國立中興大學<br>機械工程學系所<br>107<br>In the mechanical manufacturing industry, turning is the most extensive and important process. In the traditional turning process, the tool is still in continuous contact with the workpiece. It’s difficult for the cutting fluid to enter the cutting interface. It will cause higher heat load and mechanical load on the tool. Then it will reduce tool life. In addition, the chips generated by the machining are wound around the workpiece or the tool. This situation will not only affect the surface accuracy of the workpiece but also cause danger. In order to improve the above phenomenon. A vibration-assisted-machining method has appeared, which not only solves the problem of swarf but also improves the processing efficiency. The vibration-assisted-machining method has been proven to reduce average cutting force, improve tool life, and improve workpiece surface quality and accuracy compared to conventional turning.
The purpose of this study was to develop a vibration-assisted chip breaker tool holder with a simple structure and low cost. The concept of the device is to design the interior of the turning tool holder. The piezoelectric actuator is used as the vibration source and placed inside the tool holder to vibrate. The tool holder can reach its own resonance frequency, so that the tool nose can reciprocate in the Z direction. Then achieve the chip breaking effect.
This paper designs a variety of single axial vibrating tool holder with a simple structure and no additional device to significantly reduce costs. Analyze the designs by FEA-Ansys. Then compare their advantages and disadvantages. To find the best design direction. It is expected that this research will improve the development of vibration-assisted processing, making it more popular in the industry.
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AKHTAR, MD JAMIL. "OPTIMISATION OF CUTTING PARAMETERS DURING CNC TURNING OF AISI 304 AUSTENITIC STAINLESS STEEL." Thesis, 2017. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16012.
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In this study, the effect of important parameters of machinability like material removal rate and surface roughness were studied. optimization of machining parameters in turning of AISI 304 austenitic stainless steel using cemented carbide tools. During the experiment, process parameters such as speed, feed and depth of cut are used to explore their effect on the surface roughness (Ra) and Material Removal Rate(MRR) of the work piece. The experiments have been conducted using Orthogonal Array(OA) (Taguchi) design in the Design of Experiments (DOE) on Computer Numerical Controlled (CNC) lathe. Further, the analysis of variance (ANOVA) was used to analyze the influence of process parameters and their interaction during machining. From the analysis, it is observed that the Speed is the most significant factor that influences the surface roughness followed by feed and Depth of cut. The optimum cutting speed the impact of cutting speed, Feed and Depth of cut on Material Removal Rate(MRR) and surface roughness have been studied during turning an AISI 304 austenitic stainless steel using cemented carbide cutting tools.
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HUANG, SHIH-HUNG, and 黃士紘. "The Application of Visual Inspection Technology in Identification and Classification for CNC Turning Blades." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/847m2b.
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碩士<br>崑山科技大學<br>電機工程研究所<br>107<br>This thesis is aimed at the turning blades commonly used in CNC lathes, and designs an automatic detection method through the image processing technology. In order to reduce the production costs, this method is used to recognize the CNC turning blade type and inspect the blade abrasion.
The automatic detection method is mainly designed via the following five steps. Firstly, the contrast of the original image is improved by using histogram enhancement, and the homogenization filtering is used to reduce the sharper parts of the image. Secondly, five major image processing techniques including color filtering, binarization, median filtering, disconnection, and Sobel edge detection are used to process the image. The third step, the threshold value is set to determine the type of blade. The fourth step, the individual image of the blades is dealt with the image processing technology described in the second step. The fifth step, circle the tip wear point and set the threshold to judge whether the blade could reused.
This thesis uses 9 different blades for the classification testing and two blades for the abrasion inspection to illustrate the practicality and effectiveness of the automatic detection method. The experimental results show that the success rate of detecting blade types can reach 100%. The success rate of detecting 80-degree large blade wear identification can reach 98%, and the success rate of detecting 80-degree small blade wear identification can reach 100%. It can be seen that the automatic detection technology of CNC turning blade proposed in this thesis has considerable practicability.
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SINGH, DEVENDRA. "EFFECT OF NOSE RADIUS ON SURFACE ROUGHNESS IN CNC TURNING USING DESIGN OF EXPERIMENTS." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14781.
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The present work is concerned with an experimental study of turning of Aluminium 6061
alloy on computer numerical control(CNC) machine with cutting inserts having different tool
nose radii. Turning of aluminium 6061 is carried out at three different nose radius, those are
0.4 mm, 0.8 mm and 1.2 mm. Our objective of the ensuing study was to determine the effect
of cutting parameters viz. cutting speed, feed and depth of cut; and one of tool geometry
parameter that is nose radius on the surface roughness of the machined material that is
aluminium 6061 using Response Surface Methodology. The primary objective is to find the
optimum machining parameters so as to minimize the surface roughness in the chosen
domain of the performed experiments. A full-factorial Central Composite Design (CCD) is
used to design an experimental matrix. Talysurf surtronic 3+ is used to measure average
value of surface roughness. For analysis the data was compiled into MINITAB ®17. The
relationship between the machining parameters (speed, feed, depth of cut and nose radius)
and the response variable (surface roughness) were modelled and analysed using the
Response Surface Methodology (RSM). Analysis of Variance (ANOVA) is being used to
investigate the significance of these machine parameters on the response of the factor, and to
generate a regression equation for the response as dependent variable, depending on
parameters which are independent variables, through the help of a quadratic model. ANOVA
is also used to generate main effects and interaction plots which are studied along with
contour and 3-D surface plots. Results showed that feed is the most effective factor affecting
the surface roughness, closely followed by nose radius, cutting speed. The optimum settings
for carrying out the machining were obtained from Response Surface Optimizer.
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SAAD, ABU. "STUDY OF SURFACE ROUGHNESS & RESIDUAL STRESSES IN CNC TURNING USING TAGUCHI AND GENETIC ALGORITHM." Thesis, 2020. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18360.
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To remain competitive, the mechanical manufacturing industries are challenged on a regular
basis for having better productivity and good quality products. The required shape, size and
finished ferrous and non-ferrous products are conventionally developed by turning the
preformed blanks with the aid of cutting tools that have moved in a machine tool past the work
piece. Within a real production system, turning process is one of the simple and frequently
applied metal removal process among different cutting processes. The surface roughness of the
machined components is one of the most important characteristics of quality of product which
refers to the variation from the nominal surface. In many applications, surface roughness plays a
vital role, such as highly precise fits, fastener holes, artistic requirements and components
subject to dynamic loading. Roughness of the surface imposes one of the most major constraint
in the choice of cutting parameters and machine tools in process development. A variety of
factors such as feed rate, working material properties, hardness, uneven built-up edge, cutting
speed, DOC, cutting distance, tool nose radius and cutting edge angles, consistency of the
machine tool and configuration of workpiece, chatter, and use of cutting fluids have been found
to affect surface finish in turning in varying amounts.
Residual stresses have important part to play in machined component performance. Component
characteristics affected by residual stress include fatigue life, resistance to corrosion and portion
distortion. Residual stresses are improved the functional conduct of machined components.
Because of all this, it is required to understand residual stresses conveyed by
machining. Research efforts were made up of experimental results, theoretical simulation,
simulation of finite elements and different combinations of those efforts. The aims of the current
research are as follows: 1. To study the effect of surface roughness and residual stresses on CNC
machine by changing the various input factors i.e. CS, FR, DOC. 2. To research the impact of
process variables such as CS, FR and DOC on surface roughness and residual stress while CNC
turning of the super alloy Inconel718 super alloy.
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Chalermdamrichai, Vatin. "A hybrid computer-intelligent, user-interactive, process plan optimizer for four-axis CNC turning centers." 1999. http://www.library.wisc.edu/databases/connect/dissertations.html.
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Chen, Ching-An, and 陳清安. "A Research on Integrated Turning CAM System & PC-Based CNC Controller Development and Application." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/70537894033283373710.
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碩士<br>國立勤益科技大學<br>機械工程系<br>99<br>This research studies the development of a graphic-aided turning system combined a PC-Based CNC turning controller. On the CNC controller, an intelligent graphic user guided interface, a CAM computer-aided manufacturing planning system, cutting simulation and a cutting knowledge database are added.
This system improve the convenience of CNC machine operation, lower the barriers for users to master; decrease the need for skilled CNC operators, increase the differentiation and intelligence of machine tools, and raise the value and gross margin of machine.
Standard CNC controllers are the majority in the CNC machine tool market. They are generally operated by users who edit the NC codes directly on the controllers. While programming the NC codes in the factory, the users may have to leave for some part profile dimensions needed or related data. They are forced to go back and forth between the office and shop floor, resulting a lot of waste of time .
Moreover, some manufacturers are using CAD/CAM software to edit NC codes in the offices, and then transmit the NC codes to the controllers for execution. The staff on the shop floor and the staff programming the NC codes belong to different units, creating difficulties in communication and programming modification.
In the field of graphic-guided interfaces, there are some well-known manufacturers of controllers, such as MAZAK and FANUC, which are the leading providers of controllers. However, there is currently no system in Taiwan. In recent years, due to fierce global competitions, the differentiation strategy for machine tool products will be the direction in the future, and the intelligence of CNC controllers is a key point.
This research develops the graphics-guided operations interface. Firstly let skillful factory workers and machinery processing experts find out the most commonly used graphs, secondly set the required graphics in the machining process templates and set conditions in advance on the controller, thirdly the CNC operators only need to fill in the simple work piece graphic data, and then the software can generate NC codes to manufacture products, so the technical staff can get rids of a scene of hustle and bustle.
The result of this study is a more intuitive and simple-to-operate intelligent graphics-guided system. It can assist the workers on the factory production lines in editing NC codes, improve utilization rate of the machine, increase revenue and productivity of the enterprise, and bring benefits to the society.
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Hung, Yu-peng, and 洪毓鵬. "A differential evolution algorithm for optimizing cutting conditions and tool replacements for a CNC turning center." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/89077005065988551493.
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碩士<br>逢甲大學<br>工業工程與系統管理學研究所<br>98<br>Most of the literatures for the machining economics problems had focused on single cutting operation. However, in reality completing a single product usually requires more than one operation. More importantly, the technology of the machine tools has been well developed so that a single computer numerical control (CNC) machining center is capable of performing multiple operations, even simultaneously with multiple spindles and cutting tools. When several operations are performed in a CNC turning center, various tools are used for the cutting operations. Determining the tool lives for the cutting tools under different machining conditions is arduous for the shop-floor operators. The operators usually replace the tools by their experiences or the cutting tool handbooks. Frequent tool replacements may cause some waste on tool utilization, while seldom tool replacements may risk of making parts with poor quality. In this study, a complicated mathematical model in which different turning-related operations (turning, drilling, and cutting off) with proper constraints are considered is presented. A differential evolution approach is proposed to optimize the cutting conditions of these operations considering the economical tool replacement strategies.
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Hong, Shi-Han, and 洪詩函. "Research on the Surface Finish of STAVAX Using Homemade Polishing Ball on a CNC Turning Center." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/sr37rm.
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碩士<br>國立臺灣科技大學<br>機械工程系<br>106<br>Abstract
The purpose of this research is to study the surface finishing processes on the CNC turning center for STAVAX, to improve its surface roughness. The process parameters adopted the best ball burnishing parameters and ball polishing processing parameters obtained in the previous study. This study investigated the influence of five types of homemade polishing balls on the surface roughness. The best process parameters have been applied to the produced parts on the turning center.
The process parameters based on experimental results of the hexahedron as the test piece, the Type E (particle size 3 μm, concentration 40%) polishing ball has the highest surface roughness improvement value; and the best ball polishing sequence and the pass combination are: Type E(particle size 3 μm, concentration 40%) - Type C(particle size 1μm, concentration 30%) - Type B(particle size 0.3 μm, concentration 20%) - Type A(particle size 0.05 μm, concentration 20%), which improves surface roughness from Ra 0.22 μm to Ra 0.023 μm.
By applying these suitable parameters to the cam-shaped and keyway workpiece, the surface roughness form Ra 0.21 μm to Ra 0.023 μm and Ra 0.206 μm to Ra 0.02 μm could be obtained.
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KESARWANI, SONI. "TO STUDY THE EFFECT OF DIFFERENT REINFORCEM VARIOUS PARAMETERS IN ALUMINUM MATRIX COMPOSITE DURING CNC TURNING." Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16725.
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Metal matrix composites are emerging as advance engineering and structural materials and their demand are continuously growing in various sector with higher pace. Among all the metals matrix composite, aluminum matrix composite are coming out as a tough potential competitor for the conventional materials for having large number of applications in aerospace , manufacturing ,transportation ,defence ,sports and count goes on. Handpicking AMC over other metals is due to its ductility ,toughness ,strength and being less expensive .In this study, Aluminum Metal Matrix composite (AMC) has been fabricated using aluminum alloy Al 6063 T6 as base matrix material as aluminum characterizes the property of being light weight ,durable and strengthening it by adding two different type of reinforcements-one is hard ceramic particle Boron Carbide (B4C) which the third hardest material known and the other is a natural one-Egg shell powder which is easily accessible.B4C & Egg shell have been incorporated in the aluminium melt with the micro size of 104µm by creating vortex. Stir casting technique has been used to synthesize aluminum metal matrix composite because of being simple, cost-effective , convenient to use ,suitable for mass production and one of the proven process. Solidified composites were subjected to CNC turning in which process parameters like cutting speed, feed rate and depth of cut were kept constant for all. Evaluation of MRR, surface roughness, residual stress and temperature between tool-work piece interface were considered as responses. The experimental study revealed that MRR of hybrid and egg shell AMC’s were maximum. Analyzing surface roughness Ra through surface responses graph, minimum Ra was recorded for Hybrid AMC.Base alloy showed up a higher value for residual stress. Temperature measurement for Hybrid composite was recorded as maximum among all the AMC’s and base alloy.
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Lin, You-Ren, and 林宥任. "A new strategy of real-time thermal error compensation for CNC turning center using adaptive RBF network." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/82357002505491363752.
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碩士<br>大葉大學<br>機械工程研究所碩士班<br>93<br>The factors that influence the machining accuracy of Computer Numerical Control (CNC) machine tool mainly come from the geometric errors and structural thermal deformation during cutting. Therefore there are more attention on thermal error compensation technology on CNC machine tool. Although real-time thermal error compensation technique have been successfully demonstrated in laboratory, there are still some major problem before application, such as optimal thermal sensor point, control machine technique and expensive.
In the research, the on-line measurement system found by using LT02S displacement gauge for turning spindle. It is convenient to obtain radial and axial thermal drift information on spindle in machining. The model of thermal deformation established by cutting parameters with radial basis function network(RBFN).The method not only get dynamic data of thermal deformation on line, but it is unnecessary to find the optimal position of thermal sensors and place it. Therefore the way of founding the model of thermal drift will achieve the objects of economy and rapid.
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Lai, Ming-Yuan, and 賴明源. "Optimization and Implementation of Dynamic Material Removal Rate Control for a Turning Tool on a CNC Lathe." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/81041350801808953337.
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碩士<br>大同大學<br>機械工程研究所<br>90<br>Optimizing the machining profit or cost of an individual cutting tool has become important for computer numerical controlled (CNC) machining industry. The mathematical models to achieve the optimal material removal rate (MRR) control of a cutting tool during machining are established in this study. This paper not only applies MRR into the objective functions mathematically, but also implements Calculus of Variations to resolve the cutting rate control problems comprehensively. In addition, the dynamic solutions for the control of MRR are proposed and the decision criteria for selecting the optimal solutions are recommended.The versatility of this study is furthermore exemplified through a numerical illustration from the real-world industry with BORLAND C++ BUILDER. It is shown that the theoretical and simulated results are in good agreement. With this study, the manufacturing planning, machining profit/cost estimating, and even the contract negotiation can be then further approached. Furthermore, the implementation of dynamic MRR control and the analysis of surface roughness for the numerical case are experimentally performed on an ECOCA PC-3807 CNC lathe with VERDURE PA-100 controller. The machined parts are found to reach well surface roughness for finish turning. Therefore, the adaptability and applicability of the dynamic machining model are furthermore guaranteed. This study definitely provides an efficient tool of controlling the machining rate for production engineers in today’s manufacturing with profound insight.
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Chang, Ching-Shui, and 張清水. "An Investigation on Optimization Parameters of Roughness and Roundness by Boring with a CNC Turning Machine Center." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/77972538788527004960.
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碩士<br>國立屏東科技大學<br>機械工程系所<br>104<br>In this study a CNC turning machine center is used for boring S45C carbon steel, the characteristics of surface roughness and the hole roundness are investigated respectively. In addition, the optimum parameters are obtained by using single objective quality analysis with conducting arranged experiments. An orthogonal array of Taguchi method is used to arrange the boring parameters, including spindle speed, feed rate, cutting amount of workpiece. The measurements of surface roughness and the hole roundness are conducted. The results showed that a 1.2468μm for surface roughness amount with milling and a 1.2174μm for surface roughness amount with turning and a 2.702μm for roundness amount with milling and a 2.128μm for roundness amount with turning are found by selecting optimum parameters in single objective quality analysis respectively. Therefore this leads to a conclusion that use a turning and milling combined machine tool can ensure the precision and handle several processes during operation. It can also raise the productivity. The achievement of this research can be used as reference in boring related research and industrial applications.
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Uquillas, Daniel Alberto Reyes, and Daniel Alberto Reyes Uquillas. "Tool Holder Sensor Design and Implementation using Strain Gauges to Measure Cutting Forces in CNC Turning Machines." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/s3m597.
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碩士<br>國立臺北科技大學<br>機電整合研究所<br>103<br>Cutting forces in machining operation are of great importance. There is a need to measure these forces by a simple and low cost solution. The present work covers the design and construction of a sensor to measure cutting forces generated in turning with a CNC lathe by attaching strain gauges directly inside of the tool holder, one on each side of the rectangular shank, to measure strain and estimate these forces.
The design and implementation of the sensor consisted of three parts: The tool holder modification to attach the strain gauges, where a static analysis was done to find the best location to place them. The signal conditioning part in which a PCB was fabricated. This PCB holds the circuit for acquiring the signal and consists of a ½ Wheatstone bridge, an amplification stage, and a filter and offset stage. The third part is the data acquisition, where a NI cDAQ 9171 with an analog input module 9215 was used to capture the conditioned signal into the PC.
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Huang, Sheng-Fong, and 黃聖峰. "Analysis on structure strength and rigidity for CNC lathe of a simultaneous turning with multiple cutting-tool." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/77wxa8.
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碩士<br>國立虎尾科技大學<br>機械與電腦輔助工程系碩士班<br>104<br>Because domestic and foreign machinery manufacturing industry is facing fierce competition, development of complex, simultaneous machining with multiple cutting-tool and intelligent machine tools has become a new trend in the global machine tool development in recent years. Simultaneous processing technique could be overlapped such that machining time of parts may be reduced and the production efficiency can be enhanced consequently. However, due to design space limitation and cost consideration, the turret is usually replaced by a multiple cutting-tool post for a small and simultaneous turning machine. Therefore, it is hard to cover the structure rigidity and fluent movement of feeding mechanism in this multiple cutting-tool post structure in order to satisfy the requirement of dynamic rigidity under the maximum elongation of a simultaneous turning with multiple cutting-tool.
In this paper, the machining quality of a simultaneous turning can be enhanced through the improvement both of the structure static and dynamic rigidities. First, for analysis reality, a turning experiment was carried out and the cutting forces were obtained as a boundary condition for stress and strain FEM analysis model. Next, the numerical and experimental modal analyses are performed for a CNC lathe of a simultaneous turning with multiple cutting-tool, and the natural frequency, damping ratio and mode shape of the structure are investigated consequently. At last, according to the above analyses in static and dynamic rigidities, the width of tool shank is widened to enhance the structure static rigidity based on a cantilever beam-deflection theory. Moreover, with reference to a column structure in the C-type machine-tool, increasing the supporting area at lower-half portion of the spindle, lowering the weight of structure and adding some reinforcement ribs at the same time to improve the dynamic rigidity. With the modification of tool shank width in consideration of cost factor, the FEM analysis results show that the maximum total displacement, maximum equivalent stress and strain are decreased about 26%, 38%, and 35%, respectively, in contrast to the dynamic rigidity is not improved significantly. In the final design improvement version, both the static and dynamic rigidities may be improved effectively, the maximum total displacement, maximum effective stress and strain are decreased about 30%, 38% and 35%, respectively. Under the maximum rotational speed of 5000rpm (83Hz) in this CNC lathe, the corresponding natural frequencies of the first-mode to third-mode were increased about 11%, 14% and 2%, respectively.
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PATHAK, VERSHA. "OPTIMIZING THE MACHINING PARAMETERS FOR SURFACE ROUGHNESS IN CNC TURNING OF HYBRID METAL MATRIX (Al-RHAGSA) COMPOSITES." Thesis, 2018. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16593.
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In manufacturing industries, for determining the quality, surface finish of a product is very important. This study focuses on analyzing cutting parameters based on Taguchi method, a powerful tool to design optimization for quality, is used to minimize surface roughness. Taguchi method of design of experiments, the signal-to-noise (S:N) ratio, analysis of variance (ANOVA) and regression analysis are employed to investigate the cutting characteristics of three different metal matrix composites in varying proportion of reinforcements i.e. MMC (Al 7075-2%RHA2%GSA), MMC (Al7075-3.5%RHA-3.5%GSA) and MMC (Al7075-5%RHA-5%GSA) using carbide cutting tools. Different cutting parameters have different influence on the surface finish. The cutting speed, feed and depth of cut are considered using the suitable range recommended; which were 50.57m/min, 72.25m/min and 93.93m/min for cutting speed, 0.10mm/rev, 0.14mm/rev and 0.18mm/rev for feed and lastly 0.20mm, 0.35mm and 0.5mm for depth of cut. The specimen was turned under different level of parameters and was measured the surface roughness using a Taylor Hobson’s Surtronic 3+. According to the ANOVA analysis, feed is the dominant factor by 55.073% for MMC (Al7075-2%RHA-2%GSA) and depth of cut is the dominant factor by 28.056% for MMC (Al7075-3.5%RHA-3.5%GSA) and feed is the dominant factor by 55.073 for MMC (Al7075-5%RHA-5%GSA). The optimum cutting parameters which produce minimum surface roughness for MMC (Al7075-2%RHA-2%GSA) are 50.57m/min, 0.10mm/rev and 0.20mm. The optimum cutting parameters which produce minimum surface roughness for MMC (Al7075-3.5%RHA-3.5%GSA) are 93.93m/min, 0.10mm/rev and 0.50mm. The optimum cutting parameters which produce minimum surface roughness for MMC (Al7075-5%RHA-5%GSA) are 50.57m/min, 0.18mm/rev and 0.50mm. From tensile test it is concluded that in MMC (Al7075RHA-GSA), as the percentage of reinforcement increases up to certain value tensile strength decreases after this increase in reinforcement will improve tensile strength. From hardness test it is concluded that metal matrix composites (Al-RHA-GSA) have higher hardness value than pure Al 7075 alloy and as the percentage of reinforcement increases, hardness value also increases.
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Chen, Mei-Hui, and 陳美惠. "An experimental and numerical study of thermal balance optimal design for a CNC horizontal turning center spindle head." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/42173098885887473602.
Full textAbstract:
碩士<br>國立中興大學<br>機械工程學系所<br>105<br>The design of the advanced turning center machine tools is becoming more and more complicated due to the increasing demand on function, cutting speed and cutting quality. The requirement for high rigidity, light weight and thermal stability of the machine tool is increasing, while for a both fast tapping and heavy duty cutting a stable and long term high processing accuracy are needed to be achieved. In the past, most machine tool designers elaborated static and modal analyses in the machine structural design, and relied on the empirical guideline for the cooling system design and compensation techniques for mitigating thermal errors of the machine tools. In recent years, however, emerging numbers of advanced machine tool manufacturers have been applying multi-physics analysis to assist the design and development of the machine utilized for and thermal stability optimizations such as the Thermo-Friendly design concept. Therefore, the development of the analysis and optimal design ability that combines the structural rigidity, dynamic characteristics and thermal deformation stability is essential to the competitiveness of modern machine tool designers.
In this thesis, experimental and numerical studies of the heat transfer and thermal deformations for a real computer numerical control (CNC) horizontal turning center were conducted. In the simulation section, a multi-physics model based on the fluid dynamics, heat transfer and thermo-elasticity of the spindle head region including the structure and air flow inside the enclosure was established using a finite element method software (ANSYS Fluent). Experimental measurements of the spindle head temperature and the cutting point deformation are used to verify and correct the simulation model of the basic case.
The results of the analyses thus provide the insights for the thermal characteristics of the machine. The simulation model in conjunction with an optimization analysis was thus used for improving the thermal error, for the machine with the information of critical locations and parameters for temperature monitoring and control that corresponds to the Thermal Balance concept. Based on the analyzed results, the design of the cooling fan circulation of the spindle head region was proposed and experimentally tested. It is shown that the appropriate design for the location of the fan can effectively improve the thermal deformation of the spindle head and therefore improve the precision of machining.
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YAN, PEI-SHAN, and 顏珮珊. "Study on a Virtual Reality CNC Milling and Turning Machine Tool Operation Simulation and Human Machine Interface Integration System." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/96344600804762379645.
Full textAbstract:
碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>102<br>The configurations of CNC machine tool have evolved in these years resulting in more and more fruitful functionalities not only on the three-axis machines but also on the contemporary five-axis machine tool. Therefore, the operation efficiency of machining has been enhanced a lot and becomes more important although their structures are becoming more and more complicated.
However, CNC machines are expensive. This financial burden has caused obstacles of an education institution in introducing sufficient real machine tool in cultivating novice students through hand-on operation practices. To the worse, the course hours of on-site practices had been cut resulting in bigger gap between the capability expectations of the industry and the education institution. Furthermore, the small-to-medium sized industry just could not afford to use the production machine tools in training inexperienced employees because the utilization rate of the machine will be reduced and the risk of collision will be higher.
In order to improve the above problems, this study adopted off-the-shelf drawing software to create virtual controller panel based on real controllers such as Advantech-LNC, SYNTEC, and FANUC, etc. The 3D geometry of real CNC machines were also constructed by using 3D CAD software Solidwork, and the virtual machine tool were created by the virtual reality software EON. A virtual machine tool was then integrated based on the completed virtual controller panels and the virtual machine tools by the Microsoft Visual studio. The developed system could then be operated in both manual data input mode and in automatic mode. General desktop and lap top computer could be used in installing the developed system so as to facilitate more novice students to learn the basic operation of a CNC machine without being afraid of collision risk and the high maintenance cost it might incur.
Keywords: Virtual Machine, Virtual Controller, NC Program