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Dissertations / Theses on the topic 'Turning machine'
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Song, Sukhan. "Intelligent machining control for turning process /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.
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Wang, Zhanchen. "Chatter analysis of machine tool systems in turning processes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ63715.pdf.
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Van, den Berg Gideon. "Hidden Markov models for tool wear monitoring in turning operations." Diss., Pretoria : [s.n.], 2004. http://upetd.up.ac.za/thesis/available/etd-05302005-114238/.
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Ulmer, Bernard C. Jr. "Fabrication and calibration of an open architecture diamond turning machine." Thesis, Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/17120.
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Chiou, Yunshun. "Acoustic emission dynamics in turning with tool wear and chatter." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/17990.
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Cheng, Hsiang-Nan, and Hsiang-Nan Cheng. "Diamond Turning Properties of Plastic Optical Materials." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/625700.
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With sub-micrometric form accuracy and nanometer scale surface roughness, the diamond turning process provides a great solution of fast prototyping optical systems with aspheric or freeform surfaces. On the other hand, with relatively lower cost and lighter weight, optical plastics are now widely used in consumer products. To study and optimize the cutting parameters of the diamond turning process on optical plastics, a series of tests with different cutting parameters settings are conducted on seven different optical plastic materials: E48R, OKP1, OKP4, OKP4HT, PC, PMMA, and Rexolite 1422. The relationship between the surface roughness and optical plastic materials is found, and the optimized cutting parameters are recommended.
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Knuefermann, Markus M. W. "Machining surfaces of optical quality by hard turning." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/131.
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The main aim of this work was the machining by hard turning of surfaces with optical surface quality. A numerical target had been set as a surface roughness Ra = 10nm. It has been shown that achieving roughness of that magnitude by hard turning is possible. Individual work pieces exhibited the desired surface properties for short lengths at a time, but it proved to be very difficult to achieve these surfaces consistently and over longer cuts. The factors influencing the surface roughness were identified as tool defects and machine vibration in addition to the standard cutting parameters and choice of cutting tool. A model of surface generation in hard turning has been developed and good correlation between simulated and experimentally determined surface roughnesses was achieved. By introducing a material partition equation which determines the proportional contribution of material removal mechanisms in the undeformed chip a comprehensive method for assessing the contributing factors in material removal was developed. While it has been shown that surfaces in hard turning are almost exclusively generated by chip removal and plastic deformation the developed model is versatile enough to include elastic deformation of the work piece. With the help of the model of surface generation in hard turning it has been possible to attribute magnitudes of the influencing factors with respect to the cutting parameters such as feed rate and tool corner radius, and the main disturbances - tool defects and machine vibration. From this conclusions were drawn on the requirements for machine tools and cutting tools, which will need to be realised to make ultra-precision hard turning of surfaces of optical quality a feasible manufacturing process.
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Atmadi, Alexander. "Cutting fluid aerosol from splash in turning : analysis for environmentally conscious machining." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19603.
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Dubovský, Dávid. "Analýza rizik nástrojářské dílny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232113.
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This master`s thesis deals with a hazard analysis of selected machinery according to an actual legislative documents in Slovakia, which were taken over from Europien Union directives. The thesis is focused on exploring legislation related to the safety of toolroom workshop in the Czech Republic and Germany. Because of that was done the recherché of harmonized standards in these countries. Subsequently is made the identification of hazards under recherched standards and assessment of control system based on the performance level of the system. In the end are all obtained data evaluated and the precautionary measures are suggested. With taking care of economic factors are finally proposed the possibilities of the elimination of risks.
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Dawson, Ty Grant. "Effects of cutting parameters and tool wear in hard turning." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17816.
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Medaska, Michael Kenneth. "The measurement of temperatures and forces in a turning operation with cutting fluid." Thesis, Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/15983.
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Park, Jong-Suh. "The Prediction of Chatter Stability in Hard Turning." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5235.
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Despite a large demand from industry, a realistic chatter modeling for hard turning has not been available due to the complexity of the problem, which is mainly caused by flank wear and nonlinearity in hard turning. This thesis attempts to develop chatter models for predicting chatter stability conditions in hard turning with the considerations of the effects of flank wear and nonlinearity. First, a linear model is developed by introducing non-uniform load distribution on a tool tip to account for the flank wear effect. Second, a nonlinear model is developed by further incorporating nonlinearity in the structure and cutting force. Third, stability analysis based on the root locus method and the describing function approach is conducted to determine a critical stability parameter. Fourth, to validate the models, a series of experiment is carried out to determine the stability limits as well as certain characteristic parameters for facing and straight turning. From these, it is shown that the nonlinear model provides more accurate predictions than the linear model, especially in the high-speed range. Furthermore, the stabilizing effect due to flank wear is confirmed through a series of experiments. Fifth, to fully account for the validity of linear and nonlinear models, an empirical model is proposed to fit in with the experimental stability limits in the full range of cutting speed. The proposed linear and nonlinear chatter models will help to improve the productivity in many manufacturing processes. In addition, chatter experimental data will be useful to develop other chatter models in hard turning.
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Ma, David Chih-Yan. "Design and implementation of a rotary fast tool servo for a turning machine." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9594.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.Includes bibliographical references (p. 149-151).
In this thesis we describe the design and implementation of a rotary fast tool servo (RFTS) in a machine tool for turning ophthalmic lenses. To machine nonrotationally symmetric lenses, the cutting tool on the RFTS must move synchronously with the spindle rotation. Therefore, to cut a lens at high spindle speeds, the cutting tool must be capable of extremely high accelerations. In our design we mount the cutting tool at the end of a rotary arm. This allows us to achieve higher accelerations and lower vibrations than conventional fast tool servos. This thesis describes the development of the RFTS, including component selection and testing. We also detail the design and fabrication of the RFTS that is installed in a prototype turning machine.
by David Chih-Yan Ma.
S.M.
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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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Åkesson, Henrik. "Analysis of Structural Dynamic Properties and Active Vibration Control Concerning Machine Tools and a Turbine Application." Doctoral thesis, Karlskrona : Blekinge Institute of Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00452.
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Vibration in metal cutting is a common problem in the manufacturing industry, especially when long and slender tool holders or boring bars are involved in the manufacturing process. Vibration has a detrimental effect on machining. In particular the surface finish is likely to suffer, but tool life is also most likely to be reduced. Tool vibration also results in loud noise that may disturb the working environment. The first part of this thesis describes the development of a robust and manually adjustable analog controller capable of actively controlling boring bar vibrations related to internal turning. This controller is compared with an adaptive digital feedback filtered-x LMS controller and it displays similar performance with a vibration attenuation of up to 50 dB. A thorough experimental investigation of the influence of the clamping properties on the dynamic properties of clamped boring bars is also carried out in second part of the thesis. In relation to this, it is demonstrated that the number of clamping screws, the clamping screw diameter size, the screw tightening torque and the order the screws are tightened, have a significant influence on a clamped boring bar’s eigenfrequencies as well as on its mode shape orientation in the cutting speed - cutting depth plane. Also, an initial investigation of nonlinear dynamic properties of clamped boring bars was carried out. Furthermore, vibration in milling has also been studied in relation to millingtool holders with a long overhang. A basic investigation concerning the spatial dynamic properties of the tool holders of milling machines, both when not cutting and during cutting, has been carried out. Also, active control of milling tool holder vibration has been investigated and a first prototype of an active milling tool holder was implemented and tested. The challenge of transferring electrical power while maintaining good signal quality to and from a rotating object is addressed and a solution to this is proposed. Finally, vibration is also a problem for the hydroelectric power industry. In Sweden, hydroelectric power plants stand for approximately half of Sweden’s electrical power production and are also considered to be a so-called green source of energy. When renovating water turbines in small-scale hydroelectric power plants and modifying them to optimize efficiency, it is not uncommon that disturbing vibrations occur in the power plant. These vibrations have a negative influence on the production capacity and will wear various components quickly. Occasionally, these vibrations may cause severe damage to the power plant. To identify this vibration problem, experimental modal analysis and operating deflection shape analysis were utilized. To reduce the vibration problem, active control using inertial mass actuators was investigated. Preliminary results indicate a significant attenuation of the vibrations.
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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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Santos, Raphael Galdino dos. "Desenvolvimento de um método para minimizar vibrações em operações de torneamento variando dinamicamente a área de corte." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18156/tde-24092015-091753/.
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O aumento da produtividade é sem dúvida um dos maiores desafios para a indústria de manufatura. Neste sentido, a vibração tem se apresentado ao longo das últimas décadas como um dos principais limitantes para a melhoria da produtividade, especialmente em operações de usinagem. Nos últimos anos muitas pesquisas foram conduzidas com o objetivo de suprimir ou minimizar os efeitos causados pelo fenômeno de vibrações regenerativas ou chatter. Este trabalho contribui propondo o desenvolvimento de um método para minimizar os efeitos da vibração em operações de torneamento por meio da variação dinâmica de parâmetros de corte relacionados com a área da seção de corte. No presente estudo optou-se pela operação de torneamento cilíndrico e a atuação dinâmica na profundidade de usinagem. Uma análise teórica e uma verificação das condições técnicas necessárias para a aplicação do método proposto são apresentadas. Além disso, simulações numéricas foram realizadas para verificação dos modelos analíticos e correlação com os ensaios práticos. Finalmente, utilizou-se o método em um processo de usinagem real e os resultados demonstram que é possível minimizar consideravelmente os efeitos do fenômeno de chatter variando dinamicamente a profundidade de usinagem sem afetar a qualidade final da peça usinada.Improve productivity is with no doubts one of the greatest challenges for manufacturing industries nowadays. In that way, chatter vibrations has been arisen in last decades as a major limiting issue for productivity, especially on machining operations. In the last years many investigations has been carried out to suppress or minimize chatter vibrations effects on machining. In this work a development of a method to minimize chatters vibrations on turning operations by dynamically variation of cross section of the chip is proposed. Cylindrical turning operation was selected as the main target for this study and depth of cut as the parameter to be dynamically varied. A theoretical and essentials technical features analyses to apply the proposed method on a market machine tool are. Furthermore, numerical simulations were performed to validate and correlate analytical model to practical experiments. Finally, the proposed model was applied on real machining process and the results show that it is possible to substantially minimize the chatter vibration phenomenon by dynamically variation on depth of cut without affect the surface finishing.
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Skládaný, Jakub. "Volba řezných nástrojů, podmínek a obráběcího stroje pro soustružení cívek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-241670.
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The purpose of work is to provide a manufacturing processes, cutting and machine tools for machining of small parts. The proposals are designed for high volume production with a maximum productivity. The first half is largely nature of the search, which analyzes issue of tools and machines for production of rotary parts. Further proposals are developed manufacturing processes for different types of machines including multi-spindle lathes. The main result of this work is to determine appropriate type of machine for the production of specified parts.
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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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Janošek, Martin. "Technologie výroby pouzdra zpožďovače." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230016.
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In this master´s thesis is after first part, which is study explosions and detonators work, solutions to technology of production case of delay. First is anatomize technology of construction where is solve the form of stock and material from which the case of delay should be produce. Next capitol is about the ways of production of this part. The output of the thesis is complete production processes at all levels of detonators and selection of machine according to technical and economical aspects.
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Varhaník, Matúš. "Obrábění těžkoobrobitelných materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-379004.
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General perspective of this diploma thesis was aimed at machining of hard-to-machine materials. Theoretical part contains division and specification of these types of materials. Ways of classification and evaluation were also listed. Causes of worsened machinability were defined with the design of possible technological solutions, which eliminates these features. The main target of experimental part was turning nickel-based superalloy Inconel® 718 with the purpose of increase process productivity. Knowledge about appropriate types of cutting tool material and his coating were necessary for process optimization. It was achieved by replacing reference cutting tool material (coated carbide inserts) with SiAlON ceramic. Cutting tool edge was tested with an intention to discover appropriate deal between tool life and volume of material removed. Measured cutting forces, generated by machining of reference and optimize technology, were processed by using simulation software. Total deformation of workpiece material was statistically evaluated. The conclusion of diploma thesis is technical-economic evaluation of both options.
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Papadakis, Ktistakis Iosif. "An Autonomous Intelligent Robotic Wheelchair to Assist People in Need: Standing-up, Turning-around and Sitting-down." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1546469803313219.
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Johansson, Linda. "Robots and Moral Agency." Licentiate thesis, KTH, Filosofi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32400.
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Machine ethics is a field of applied ethics that has grown rapidly in the last decade. Increasingly advanced autonomous robots have expanded the focus of machine ethics from issues regarding the ethical development and use of technology by humans to a focus on ethical dimensions of the machines themselves. This thesis contains two essays, both about robots in some sense, representing these different perspectives of machine ethics. The first essay, “Is it Morally Right to use UAVs in War?” concerns an example of robots today, namely the unmanned aerial vehicles (UAVs) used in war, and the ethics surrounding the use of such robots. In this essay it is argued that UAVs might affect how the laws of war (LOW) are interpreted, and that there might be need for additional rules surrounding the use of UAVs. This represents the more traditional approach of machine ethics, focusing on the decisions of humans regarding the use of such robots. The second essay, “The Functional Morality of Robots”, concerns the robots of the future – the potential moral agency of robots. The suggestion in this essay is that robots should be considered moral agents if they can pass a moral version of the Turing Test. This represents the new focus of machine ethics: machine morality, or more precisely, machine agency.QC 20110414
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Pavlék, Radim. "Brousící jednotka k svislému soustruhu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-264922.
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This diploma thesis solves grinding box unit for vertical boring and turning machine for ČKD Blansko. For fixing is used standard fixing system used in ČKD Blansko. Spindle is drived by engine placed in slide ram. Engine can be also used for milling box unit. Grinding box unit must stand operating load. Using of automatic balancing system is also solved in this project.
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Osambo, Okoko. "An exploratory investigation into the feasibility of turning the student identification card into a debit card: The case for the University of the Western Cape." University of Western Cape, 2003. http://hdl.handle.net/11394/7756.
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Magister Commercii - MComThis study investigates the financial, marketing as well as technological feasibility of turning the current University of Western Cape (UWC) Student ID Card into a more featured debit card called the "Hoop Kaarf'. This debit card will offer the functionality of access to secure UWC areas, the purchase and use of photocopying credits, the purchase of printing credits, taking out library books; and identification, as the old student card does. It will also have the added functionality of replacing cash when paying for vending machines, cafés, takeaways, shops, supermarkets and withdrawing money from ATMs, at UWC, within South Africa and outside the country.
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Crolet, Arnaud. "Contribution à l'étude de l'influence du comportement vibratoire du système "pièce - outil - machine" sur la qualité de surface obtenue en tournage de superfinition." Thesis, Vandoeuvre-les-Nancy, INPL, 2008. http://www.theses.fr/2008INPL040N/document.
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Le tournage de superfinition est très spécifique avec une profondeur de passe de l’ordre de 0.05mm et une avance de 0.05mm/tour et permet d’obtenir des surfaces dont la précision et la rugosité sont équivalents à ce que l’on pourrait obtenir par rectification. Cependant, ce procédé est fortement influencé par les caractéristiques dynamiques du système usinant. Le but de nos travaux est de comprendre comment les caractéristiques dynamiques du système Pièce / Outil / Machine (P.O.M.) influencent la qualité de surface obtenue en superfinition à l’outil coupant. Dans un premier temps, nous avons défini, en nous appuyant sur la méthode normalisée du Couple Outil Matière (C.O.M.), des conditions de coupe acceptables et stables. Ensuite, une analyse fréquentielle nous a permis d’identifier trois éléments du système P.O.M. comme sources de vibrations remarquables, à savoir la machine elle-même, la fréquence de rotation de la broche et l’outil utilisé. Puis, nous avons mis en place une démarche expérimentale lourde afin d’évaluer l’influence des sources identifiées sur des critères d’état de surface et sur les vibrations mesurées au niveau de l’outil coupant. Enfin nous avons abordé l’étude des corrélations existantes entre les vibrations et l’état de surface généré en tournage de superfinitionThe superfinishing in turning is very specific, depth of cut about 0.05mm and feed in the order of 0.05mm/rev and allows to produce surfaces with precision and roughness equivalent to grinding process. However, this process is strongly influenced by the dynamic characteristics of the machining system. The aim of our work is to understand how dynamic characteristics of the Part/Tool/Machine (P.T.M.) system influence the surface quality obtained in superfinishing with cutting tool. Initially, we defined acceptable and stable cutting conditions by using the standardized method of the Couple tool-matterial. Then, a frequential analysis enabled us to identify three remarkable sources of vibrations in the P.T.M. system that are the machine tool, the spindle frequency and the tool. Then, we set up an experimental study in order to evaluate the influence of the identified sources of vibrations on surface quality and on the vibrations measured on the cutting tool. Finally we studied the correlations between the vibrations and the surface quality obtained by superfinishing turning
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Zouhar, Michal. "Brousící hlava úhlová pro svislý soustruh." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-264915.
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My diploma thesis solves project of grinding angle box unit for vertical boring and turning machine which extends technological possibilities of vertical lathe SKD 40/47D. The submitter ČKD Blansko Holding, a.s. demanded to work out assembly drawing, 3 construction drawings and necessary calculations. Spindle drive of grinding unit is implemeted by the aid of engine which is deposit in the sliding machine. Chucking equipment is realised with standart system which is used by ČKD Blansko.
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Ondráček, Ivo. "Atypické využití karuselového soustruhu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378855.
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The first part of the diploma thesis deals with a brief research of turning operations and the characteristic of vertical lathes with description of individual parts. There are described possibilities and a typical vertical lathe assortment and also representatives of Czech manufacturers of vertical lathes. In the second part, the thesis deals with elaboration of the design technology production of the selected component, including the NC program. First, a component and material is selected, a semi-finished product is designed, suitable machines and tools are selected and finally a technological process of production is developed. The conclusion of the thesis contains the technical–economic evaluation, where the total costs of production are solved.
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Macek, Robin. "Vývoj multifunkčního obráběcího centra." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417575.
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This diploma thesis deals with the design of a selected structural part of multi-tasking machine tool. The solved construction part is the design of a turning table with the possibility of positioning with specified parameters. The research part is focused on CNC machine tools, multi-tasking machine tools and individual parts of turning tables with possible positioning. In a design part, the design of design variants of possible solutions is made and the choice of the design solution is made with the help of multicriteria analysis. Subsequently, the selected design solution is processed with the help of the necessary technical calculations. The result of the work is then a 3D model and the required drawing documentation.
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Frangoudis, Constantinos. "Controlling the dynamic characteristics of machining systems through consciously designed joint interfaces." Licentiate thesis, KTH, Maskin- och processteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-146306.
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The precision of machining systems is ever increasing in order to keep up with components’ accuracy requirements. At the same time product variants areincreasing and order quantities are decreasing, which introduces high demands on the capability of machining systems. The machining system is an interaction between the machine tool structure, the process and the control system and is defined in terms of capability by the positional, static, dynamic and thermal accuracy. So far, the control of the machining system, in terms of static and dynamic stability is process based which is often translated into sub-optimum process parameters and therefore low productivity.This thesis proposes a new approach for control of the machining systemwhich is based on the capability to control the structural properties of themachine tool and as a result, controlling the outcome of the machining process.The control of the structural properties is realized by carefully designed Joint Interface Modules (JIMS). These modules allow for control of the stiffness and damping of the structure, as a result of tuning the contact conditions on the interface of the JIM; this is performed by control of the pre-load on the interface,by treatment of the interface with damping enhancing materials, or both. The thesis consists of a presentation of the motivation behind this work, the theoretical basis on which the proposed concept is based and a part describing the experimental investigations carried out. Two prototype JIMs, one for a milling process and one for a turning process were used in the experimental investigations that constitute the case studies for examining the validity of the proposed concept and demonstrating its applicability in a real production environment.QC 20140611
EU FP7 POPJIM
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Tatíček, Jiří. "Návrh vřeteníku odhrotovacího stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232058.
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The aim of this thesis is design of deburring machine, focusing on the headstock, capable of aligning the front side and chamfering at the round bars. At the beginning is a short research design nodes, used in the construction of machine tools. As part of the work was done and the measurement of cutting forces to determine the load while standing. Work also includes a series of calculations to justify the use of selected components. The outcome of the work is also a 3D model.
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Chen, Shenjian. "Contribution to a technologically oriented turning system." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334441.
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Pifer, Mark T. "Application of thin film PRTD's for the monitoring of cutting tool temperature during turning." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-08182009-040521/.
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Holík, David. "Optimalizace procesu soustružení zohledňující mechanické a vykonove vlastnosti stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229709.
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Manufacturing companies are increasingly compelled to optimize their machining processes for various reasons, such as improved cost effectiveness, tighter regulations and marketing advantages. Increasing energy costs in particular shift the reduction of energy consumption and the cost effectiveness of the production method more into the focus of corporate strategy. This is done by using the example of a turning process for the production of a tapered roller bearing. The main goal of this thesis can be identified as a detailed investigation of the energy consumption of certain turning machine. Further, different optimization approaches regarding energy efficiency are introduced taking under consideration tooling costs and machining time.
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Munoz, Raul E. "Finite element modelling (including material grain refinement prediction) when turning advanced aerospace alloys." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5844/.
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The overall aim of the project/research was to develop finite element modelling/process simulation capability to predict workpiece surface integrity following machining of advanced aerospace alloys. The modelling work employed the general-purpose commercial finite element (FE) software ABAQUS, due to its robust solver for handling complex, dynamic non-linear problems as well as the facility to define custom algorithms/subroutines. Both 2D and 3D fully coupled thermo-mechanical FE models were formulated to simulate the orthogonal turning of Ti-6Al-4V titanium alloy and Inconel 718 nickel based superalloy. The performance of various material models and associated damage criteria were assessed, with high strain rate (up to ~ 6000 s\(^-\)\(^1\)) / temperature (up to ~ 850°C) flow stress data for Inconel 718 obtained from compression tests using SHPB and Gleeble systems. In addition to evaluating the influence of operating conditions on response measures such as cutting forces, temperatures and chip morphology, the FE models were extended to enable prediction of grain size distribution due to dynamic recrystallisation (DRX) of workpiece microstructure following machining. This was accomplished by developing a VUMAT user customised subroutine that included material constitutive modelling, damage initiation/propagation as well as a novel material model to predict workpiece grain refinement due to DRX.
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Hassan, Nurhafizzah. "Development of a dynamic model for vibration during turning operation and numerical studies." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/18233/.
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Turning operation is a very popular process in producing round parts. Vibration and chatter noise are major issues during turning operation and also for other machining processes. Some of the effects of vibration and chatter are short tool life span, tool damage, inaccurate dimension, poor surface finish and unacceptable noise. The basic dynamic model of turning operation should include a rotating work piece excited by a force that moves in the longitudinal direction. Dynamic interaction between a rotating work piece and moving cutting forces can excite vibration and chatter noise under certain conditions. This is a very complicated dynamic problem. Vibration and chatter in machining is one example of moving load problems as the cutter travels along the rotating work-piece. These moving cutting forces depend on a number of factors and regenerative chatter is the widely accepted mechanism and model of cutting forces which then introduce time delays in a dynamic model. In this investigation, the work piece is modelled as a rotating Rayleigh beam and the cutting force as a moving load with time delay based on the regenerative mechanism. The mathematical model developed considers work piece and cutting tools both as a flexible. Without doubt, this dynamic model of vibration of work piece in turning operation is more realistic than previous ones as the dynamic model has multiple-degrees-of-freedom and considers the vibration of the cutter with regenerative chatter. It is found that the cutting force model of regenerative chatter which introduces time delay in a dynamic model leads to interesting dynamic behaviour in the vibration of rotating beams and a sufficient number of modes must be included to sufficiently represent the dynamic behaviour. The effects of depth of cut, cutting speed and rotational speed on the vibration and chatter occurrence are obtained and examined. Simulated numerical examples are presented. These three different parameters are vital and definitely influence the dynamic response of deflection in the y and z directions. The depth of cut is seen to be the most influential on the magnitude of the deflection. In addition, higher cutting speed combined with high depth of cut promotes chatter and produces a beating phenomenon whereas rotational speeds have a moderate influence on the dynamic response. Furthermore, several turning experiments are conducted that demonstrate vibration and chatter in the machining operations. There is fairly good qualitative agreement between the numerical results and the experimental ones.
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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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Pernica, Jan. "Projekt lehké obrobny v TOS Kuřim - OS, a.s. - soustružnické pracoviště." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227972.
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Master's thesis deals with the design layout of the workplace in light machinery production in TOS Kuřim-OS, as. On this workplace is turning rotating parts are manufactured in the weight of 250 kg. Proposals arrangement based on how the current state and the methodology of the design layout. It is also based on the use of machines and parameters, security principles and the possibility of new premises. To evaluate the best options are proposed criteria, which are determined by the most appropriate solution. For the chosen variant is created by the project, which includes the cost of setting up an evaluation, documentation and the benefits that arise from this option for the workplace.
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Li, Lei. "Investigation of the Optical Effects of Single Point Diamond Machined Surfaces and the Applications of Micro Machining." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1252435737.
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Kinc, Jiří. "Využití vysokotlakého chlazení na dlouhotočných automatech." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231129.
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The thesis describe high-pressure cooling system and present experiment, when is using this cooling technology for turning cylindrical workpiece to long-turn machines. Workpiece manufactured using high-pressure cooling system is compares with Workpiece manufactured using low-pressure cooling system. Results are analyzed, evaluated and plotted in a single graphical relationships. The thesis is completed the analysis, discussion and recommendations regarding the using of high-pressure cooling.
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Matsumoto, Hidekasu. "Uma contribuição ao estudo do processo de torneamento de aços endurecidos." [s.n.], 1998. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264206.
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Orientador: Anselmo Eduardo DinizTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-07-23T21:54:22Z (GMT). No. of bitstreams: 1 Matsumoto_Hidekasu_D.pdf: 9333077 bytes, checksum: 51f227c51103bc62610f0c64d486742b (MD5) Previous issue date: 1998
Resumo: Neste trabalho procurou-se estudar a viabilidade de se tornear aços no estado endurecido utilizando máquinas de projeto mecânico convencional (sem mancais hidrostáticos e com um certo desgaste) comandadas numericamente, com a finalidade substituir as operações de retificação. Para tanto, usinou-se dois tipos de corpos de prova, de aço ABNT 52100 temperado e revenido com dureza média de 60 HRc (Rockwell C), com ferramentas de corte de PCBN (65% de CBN) e cerâmica mista ('Al IND. 2¿ 'O IND. 3¿ + TiC) encontradas no mercado. Monitorou-se os ensaios via corrente do motor principal e emissão acústica, com a finalidade de determinar o momento da substituição da ferramenta de corte. Após a análise dos resultados, chegou-se às seguintes conclusões: a) é possível substituir as operações de retificação por torneamento com máquina de projeto mecânico convencional, uma vez que se obteve qualidade IT5 e rugosidade menor que Ra = 0,6 'mu¿m, com vidas das ferramentas suficientemente longas para determinadas aplicações; b) os métodos de análise dos sinais de emissão acústica e corrente do motor utilizados, não se mostraram adequados para indicar o momento da troca da ferramenta; c) em geral, a ferramenta cerâmica apresentou vida média maior que a ferramenta de PCBN, porém com uma dispersão também maior
Abstract: The main goal of this work is to study the feasibility of turning hardened steels using a lathe with a conventional mechanical design (without hydrostatic bearings), aiming to replace grinding operations. For this purpose, two kinds of quenched and tempered 52100 steel workpieces were machined, with average hardness of 60 HRc, using PCBN (65% of CBN) and mixed ceramic ('Al IND 2¿¿O IND. 3¿ + TiC) tools. Both the electrical current of the main motor and the acoustic emission were monitored, aiming to automatically establish the moment to replace the tool. After the result analyses, the following conclusions were drawn: a) it is possible to replace grinding operations by turning with a conventional mechanical design lathe, since the workpiece quality obtained was within IT5 and the surface roughness was below Ra = 0.6 ' 'mu¿m, with tool life long enough for this kind of applications; b) the tool life monitoring through acoustic emission and electrical current of the main motor did not show to be suitable to establish the moment to replace the tool; c) in general, mixed ceramic tool had longer average toollife than PCBN tool, but presented larger scatter
Doutorado
Materiais e Processos de Fabricação
Doutor em Engenharia Mecânica
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Pinheiro, José Antonio. "Desenvolvimento de um controlador PID para aplicação em uma mesa angular rotativa." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18146/tde-19012011-105359/.
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Trata do desenvolvimento de um controlador Proporcional-Integral-Derivativo (PID) para uma Mesa Angular Rotativa (MAR) destinada à usinagem de ultraprecisão. O sistema de controle tem como objetivo efetuar posicionamento angular de alta resolução e repetibilidade antes e durante a usinagem de ultraprecisão, propiciando fabricar peças complexas através de torneamento. A MAR faz uso de elementos como mancais de flexão, atuadores piezelétricos, juntamente com o sistema de controle PID. A estratégia de controle é baseada na aquisição de dados na plataforma de desenvolvimento LabVIEW®, para gerar curvas tensão de saída do tesatronic versus deslocamento da MAR e no processamento dos sinais adquiridos ao longo do microposicionamento da MAR em tempo real para realimentação de posição. Constatou-se que o sistema suporta deslocamentos da MAR correspondendo a expansão do atuador piezelétrico de até 24 µm com freqüência de acionamento de até 3 Hz. O uso de filtro Chebyshev provocou atraso na resposta e forte instabilidade no sistema. Conclui-se que para a melhora do desempenho do sistema em termos de freqüência pode ser conseguida através do uso de filtro do tipo FIR (Finite Impulse Response).A Micro Tilt Stage (MTS) was developed in the Precision Engineering Laboratory (University of São Paulo) to be used in commercial diamond turning machines. The MTS has the aim of positioning workpieces angularly with high resolution and repeatability before and during ultraprecision machining. The use of flexural bearings and piezoelectric actuators together with a PID control system provided improved dynamic performance. The control strategy is based on data acquisition using LabView to create standard curves and perform the correction of positioning errors. Experimental tests are performed with displacement of the (MTS), up to 24 µm, with frequency, up to 3 Hz. The use of a Chebyshev filter caused a delay and a strong instability in the system. In conclusion, in order to improve the performance of the system in terms of frequency, the use of a FIR filter (Finite Impulse Response) may be indicated.
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Pomikálek, Adam. "Mobilní soustružnické obráběcí centrum se svislou osou obrobku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443775.
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The subject of this diploma thesis is the conceptual design of a mobile lathe centre with a vertical workpiece axis. First, a search in the field of mobile lathes, stationary lathes and methods of their transport is performed. Then, from the described transport machine options, the most suitable transport variant is selected, thanks to which variants of the mobile machine solution are created. Subsequently, the design of the winning variant is fully adapted to the method of transport using containers. Emphasis is placed on simple construction, maximum use of the transport packaging in the machine frame and easy assembly of the machine customer. For these reasons, the machine frame must consist of two containers. Finally, the assembly and adjustment of the machine tool are solved in combination with the verification of the functionality of the proposed concept.
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Ta-WeiYeh and 葉大維. "Turning Tool Monitoring using Machine Vision." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/17723114952472988617.
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碩士國立成功大學
資訊工程學系
104
In recent years of Industry 4.0, Automation machinery production is currently the most basic request. The purpose of this thesis is to establish an online real-time capturing dynamic rotating tool image for image geometric analysis, and implement measurement tool automation. After the completion of the detection, correcting tool data and repairing to cut. This thesis is to capture dynamic rotating tool to detect. Two types of back light detection and frontlight detection are not the same functions. In the backlight, the camera capture rotating tool , then using pre-processing and cumulative methods, binary and ROI (region of interest) to find tool images. Then using line Hough transform to deburr tool image and find the tool radius measurement, tool length measurement, the spindle inclination detectors, tool breakage detection and tool wear detection. In the frontlight, using SIFT to stitch expanded view of tool, then expect to make some tool surface detection. If tool image has a blur situation from high speed rotation, using Wiener filter to recover. Finally, collecting some results and expect the tool detection to be better and further development in the future.
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Weng, Jeng-yi, and 翁正一. "Nonlinear Dynamic Analysis of Turning Machine." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/16367326362573350894.
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碩士義守大學
機械與自動化工程學系碩士班
97
This thesis is to make use of analysis to come to emulation to slice to pare the tool on board knife to has in the process of slicing to pare in, vibrate produce it not the influence and analysis of the line dynamic state system. Also get the system basic dynamic state track by the number emulation of Runge-Kutta method. Again further with Phase Diagram、Power Spectrum、Bifurcation Diagram、Poincarè section four kinds of diagrams are shown to analyze the dynamic state characteristic of the emulation system. End again by maximum Lyapunov exponent. To whether system gets into mentally dense exercise to make nearer substantial evidence of proof. Tool machine while slicing pare, because of work piece quantity lack of impartiality of unbalance power and non- line sexually slice to pare power a bottom a creation to synchronously vibrate, cent the flap, quasi- period vibration and mentally dense exercise etc. the complexity respond to, through the dissimilarity turn soon compare number imitate result after we also find just under the not- line factor function slice to pare to exercise a track to accept irregular now confusion exercise, the dynamic state which slices to pare system responds to in spite of at under the assumption of the day labor piece or the short work piece all the sentence have rather abundant of non- period characteristic. Also at Phase Diagram、Power Spectrum all present equal mess and irregularly the non- period vibrate phenomenon.
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Wang, Ming-jun, and 王銘君. "Parallel Turning Machine Scheduling with Limited Power Load." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/02975429293028069508.
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碩士逢甲大學
工業工程與系統管理學系
101
Power has become indispensable part of modern life in 21st century, and overuse of energy often results in severe climate change and environmental pollution. In classical production scheduling problems for parallel machines, jobs are known and unchanged. However, energy issues are seldom considered for such the problems in most of the literatures. In this study, selection of proper machining parameters under an electrical load constrained in a shop floor is addressed for the parallel machine scheduling problem. The objective of the scheduling problem is to minimize makespan. A simple heuristic is proposed to determine the proper machining parameter for each turning operation. After setting the machining parameters for all the jobs, the processing times are then constant, a genetic algorithm (GA)-based approach is developed for solving this parallel machine scheduling problem.
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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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碩士崑山科技大學
機械工程研究所
102
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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Scheffer, Cornelius. "Monitoring of tool wear in turning operations using vibration measurements." Diss., 2000. http://hdl.handle.net/2263/30483.
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This study investigates the use of vibration and strain measurements on machine tools in order to identify the propagating wear of the selected tools. Two case studies are considered, one of which was conducted in the plant of a South African piston manufacturer. The purpose of the ftrst case study was to investigate the feasibility of vibration monitoring to identify tool wear, before attempting to implement a monitoring system in the manufacturing plant. During this case study, data from a turning process was recorded using two accelerometers coupled to a PL202 real time FFT analyser. Features indicative of tool wear were extracted from the sensor signals, and then used as inputs to a Self-Organising Map (SOM). The SOM is a type of neural network based on unsupervised learning, and can be used to classify the input data into regions corresponding to new and worn tools. It was also shown that the SOM can also be used very efficiently with discrete variables. One of the main contributions of the second case study was the fact that a unique type of tool was investigated, namely a synthetic diamond tool specifically used for the manufacturing of aluminium pistons. Data from the manufacturing of pistons was recorded with two piezoelectric strain sensors and a single accelerometer, all coupled to a DSPT Siglab analyser. A large number of features indicative of tool wear were automatically extracted from different parts of the original signals. These included features from time and frequency domain data, time series model coefficients as features and features extracted from wavelet packet analysis. A correlation coefficient approach was used to auto-lJUltically select the best features indicative of the progressive wear of the diamond tools. The SOM was once again used to identify the tool state. Some of the advantages of using different map sizes on the SOM were also demonstrated. A near 100% correct classification of the tool wear data was obtained by training the SOM with two independent data sets, and testing it with a third independent data set. It was also shown that the monitoring strategy proposed in the second case study can be fully automated and can be implemented on-line if the manufacturer wishes to. Some of the contributions of this study are the use of the SOM for tool wear classification, and conclusions regarding the wear modes of the synthetic diamond tools.Dissertation (M Eng (Mechanical Engineering))--University of Pretoria, 2006.
Mechanical and Aeronautical Engineering
unrestricted
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Chen, Po-Cheng, and 陳柏丞. "Research on the on-machine measurement and error compensation by using turning and milling complex machines." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/965m43.
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碩士國立高雄應用科技大學
模具系碩士在職專班
106
The measurement of conventional manufacturing process is a offline measurement. The machined workpiece must be removed from the process and inspected by independent inspection machine. If the workpiece dimensional errors were found, and it will be machined once again. The surface quality and the dimensional accuracy of the workpiece were be affected by the passes between machining and measurement. A series of machining and measurement processes cause time consuming. In this study, the turn-milling technology was used in this machining process. The tool path of the hexagon punch was generated by CNC macro programming. The measurement process was inserted into the machining cycles. At the end of the first cycle, the touch probe measured the geometry of the hexagon punch. If the size of hexagon punch was not correct, and the tool offset of the controller will be updated automatically. Until the size of hexagon punch was correct, and then this cycle will be stop. The dimensional accuracy of the workpiece were compared between on-machine measuring (OMM) in turn-milling machine and coordinate measuring machine (CMM). The dimensional accuracy of the workpiece with OMM could be achieved in ± 10 μm. Although, the measurement of CMM was accurate than OMM, but the OMM was efficiency and less time-consuming than CMM. This on-machining measuring with touch-trigger probe in turn-milling machine could improve the dimensional accuracy of the workpiece effectively.
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HSIANG, WEI-KAI, and 向韋愷. "Study of an Integrated Virtual Reality Milling and Turning Machine Motion Simulation System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/90799470333585367223.
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碩士國立高雄應用科技大學
機械與精密工程研究所
101
Multi-axis machine tools and mill-turn machine tools have been used in aerospace, molding, biomedical, automobile industry and other manufacturing industries with complex surfaces, and play an important role. However, due to the expensive price, the demand of manufacturers use CAD/CAM software to simulate the actual machining process also increased, so applying virtual reality technology to the virtual machine tool machining simulation system development has gradually been paid great attention resulting in the development of machine tool manufacturers in recent years. Because the structure and motion of multi-axis machine tools and mill-turn machine tools are complicated, operation and training the high cost equipment is a burden, for general education institutions, it has also negative influences for machine tool builders willing to participate in multi-axis machine tools and mill-turn machine tools development. In addition, the majority of users and learners do not really understand the operation of multi-axis and mill-turn machine tools, and using NC code correctly in the actual machine, therefore collision by inexperienced person might happen with high risk. In summary, this research made use of Visual Studio C # programming language and integrated EON Virtual Reality technology, converting the actual machine drawing files designed in SolidWorks and developed PCNC (Personal Computer Numeric Control) framework. With real-time monitoring of processing center, integrated several virtual machine tool controller’s human-machine interface in different virtual machines, accomplished realistic machine motion simulation system to assist the expensive machinery teaching and training; its functions of teaching and training systems include selecting a different configuration of virtual machine tools and virtual controller panel, simulating machine motion and controller panel operation, NC programming machining operations and machining motion simulation, verification of the machining processing before actual machining, and collision detection. Finally, the author expects this system can be used to assist learning and can enhance users’ and learners’ understanding of CNC machine tools, to fully understanding the advanced operation of the real machine tools.