To see the other types of publications on this topic, follow the link: Machining methods.
Dissertations / Theses on the topic 'Machining methods'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Machining methods.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Hussein, Wessam Mahmoud Elbestawi Mohamed A. A. Veldhuis Stephen C. "Machining process monitoring using multivariate latent variable methods." *McMaster only, 2007.
Find full text
2
Asante, James Nathaniel. "Analysis methods for machining fixtures with multiple point contacts." Related electronic resource: Current Research at SU : database of SU dissertations, recent titles available full text, 2008. http://wwwlib.umi.com/cr/syr/main.
Full text
3
Rashid, Asif Bin. "An Experimental and Theoretical Study of Developing Methods for Machining Ceramic Materials by Electrical Discharge Machining (EDM) Process." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami159426017923493.
Full text
4
Fayad, Ramzi. "Predictive tool monitoring system for metal machining using aritificial intelligence methods." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.433992.
Full text
5
Nguyen, Thai. "Development of New Cooling Methods for Grinding." University of Sydney, 2005. http://hdl.handle.net/2123/1689.
Full textAbstract:
Doctor of PhilosophyThis research aimed to develop new cooling methods to replace, or at least minimise, the use of currently used grinding coolants which are known to be harmful to the environment. The methods used involved the application of a cold air and vegetable oil mist mixture (CAOM), and the use of liquid nitrogen as cooling media. Allied research focused on the development of a segmented grinding wheel equipped with a coolant chamber. The feasibility of a grinding system using CAOM was assessed on the surface grinding of plain carbon steel 1045. It was found that at low material removal rates, ground surfaces were obtained with a quality comparable to that from grinding with a conventional coolant in association with a reduction of grinding forces. There was no significant difference in the subsurface hardness of the components using CAOM, although the latter method showed a stronger dependence of surface residual stresses on the depth of cut due to the limit in cooling capacity of CAOM. The effects of using liquid nitrogen as a cooling medium on the microstructure of quenchable steel were explored. It was found that a martensite layer was induced on the ground surface. The microstructure featured a dispersion of very fine carbides within the martensite lattice, resulting in a remarkable increase in hardness and high compressive residual stresses within the layer. The topography of the ground surfaces indicated that the material was predominantly removed by brittle fracture. Furthermore surface oxidisation was suppressed. In the interest of coolant minimisation, a segmented wheel equipped with a pressurized coolant chamber was developed. A higher quality ground surface was obtained in conjunction with a coolant saving of up to 70%. In addition, the adhesion of ground chips on the wheel surface largely disappeared. Furthermore, surface tensile residual stresses caused by thermal deformation were minimised. The mechanism of coolant disintegration to form mists using this type of wheel system was studied. The Weber theory for Newtonian jet instability was applied to quantitatively determine the contribution of coolant flow rate to mist and ligament modes. A semi-analytical model was then developed to predict the mist flow rate by taking into account both grinding parameters and coolant properties. The model prediction was in agreement with experimental measurements. Based on the principles of fluid motion and the mechanisms of spin-off and splash, analytical models for both conventional and segmented wheels were established to provide a physical understanding of the mechanisms of coolant penetration into the grinding zone. Coolant minimisation was evident using the segmented wheel where the coolant pumping power into the grinding zone increased with wheel speed, but for the conventional wheel it decreased. A quantitative analysis was developed that accounted for the coolant properties and system design characteristics governing the penetration mechanism revealed by the theory established above. In conjunction with the mist formation analysis, the developed model offers a practical guideline for the optimal use of grinding coolants in achieving a balance between the demands of productivity and care for the environment.
6
Lebeck, Matthew Victor. "Predictive methods applied to the vibratory response of machining structural steel and weldments." Thesis, Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/16021.
Full text
7
Bringmann, Bernhard. "Improving geometric calibration methods for multi-axis machining centers by examining error interdependencies effects /." Düsseldorf : VDI-Verl, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=015962642&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Full text
8
Qi, Qiang. "INVESTIGATION OF POLISHING METHODS AND SURFACE ANALYSIS AFTER MACHINING AISI 4140 ALLOY STEEL." UKnowledge, 2017. https://uknowledge.uky.edu/me_etds/107.
Full textAbstract:
AISI 4140 alloy steel has been a very common material to be investigated in automotive and aerospace industries for several decades. AISI 4140 alloy steel is chromium, molybdenum, and manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. The functional performance is largely determined by the surface states after machining.
The aim of the present study is to explore the polishing methods and surface analysis after machining AISI 4140 alloy steel in different cutting speeds and cooling conditions. The surface analysis includes surface roughness, hardness and residual stresses. Compared to traditional polishing, an innovative experimental work was conducted on electro-polishing technology for removing surface layer before subsurface residual stress measurement.
The results of this work show that the electro-polishing method is a significant approach for the residual stress analysis. High cutting speed and cooling conditions can improve the surface quality to achieve lower surface roughness, higher microhardness and more compressive residual stresses after machining AISI 4140 alloy steel.
9
Gärdek, Harald, and Boubker Ouaha. "A State of the Art Report and Comparison with Conventional Methods of Abrasive Waterjet Machining Technology." Thesis, KTH, Tillämpad maskinteknik (KTH Södertälje), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170080.
Full text
10
Kunhart, Josef. "Nasazení nekonvenční metody vodního paprsku do technologického procesu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228635.
Full textAbstract:
In terms of needs of practice, material slicing is one of the first operations at manufacture or fabrication. During the slicing process different conventional and non-conventional methods are used. Among the basic non-conventional methods is water jet cutting of two types: Abrasive Water Jet cutting (AWJ) and Water Jet Machining (WJM). This method is used in the technological process also for cutting devices of unique shapes and diverse materials
11
Lemaster, Richard L. "Development of an Optical Profilometer and the Related Advanced Signal Processing Methods for Monitoring Surface Quality of Wood Machining Applications." NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-09282004-152158/.
Full textAbstract:
The research described here provides the technology and theory to quantify surface quality for a variety of wood and wood-based products. This technology provides a means of monitoring trends in surface quality which can be used to discriminate between Agood@ products and Abad@ products (the methods described in this research are not intended to provide ?grading? of individual workpieces) as well as provide information to the machine operator as to the source of poor quality machined surfaces. The analysis can be done either on-line at industrial speeds or off-line as a periodic quality control tool. Although the surface quality can be quantifiably measured, the determination of the best feature from the surface profile (root mean square, peak amplitude, average wavelength, frequency content, Joint Time and Frequency Analysis (JTFA) and Wavelet Analysis results, etc.) for the quantification of surface Adefects@ is highly dependent on the application. This research consisted of three broad areas: (1) determination of an optimal hardware configuration for both laboratory and industrial surface scans of wood products, (2) determination of the optimal set of surface descriptors as well as the development of advanced signal processing techniques such as the wavelet transform to accurately describe the quality of a surface as well as provide information to the machine operator on the cause of the loss of surface quality, and (3) development of a software interface to distill the advanced signal processing techniques into a readily obtainable and readable format for the machine operator as well as provide assistance for process decisions.
12
Gašpar, Daniel. "Automatizace pracoviště elektroerozivního obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230538.
Full textAbstract:
The aim of this thesis is the analysis of the current state in the workplace EDM and suggestion of the automation workplace in tool making "KASKO forms" including techno-economic assessment of the current and suggested solutions on the selected product and quantification of payback period.
13
Koen, Devan. "Investigation of novel cooling methods to enhance aerospace component manufacturing practices." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/18058.
Full textAbstract:
Thesis (MScEng)--Stellenbosch University, 2011.ENGLISH ABSTRACT: The aerospace industry actively pursues innovation, especially in materials and their use in new applications, to improve their aircraft as well as their competitive position. Ti-6Al-4V has been available now for more than 50 years. Yet, in the new generation of aircraft using structural composites, a dramatic increase in the proportion of Ti-6Al-4V will be seen along with emerging application in automotive and chemical industries. This material possesses superior material properties compared to conventional materials such as steel and aluminium, although it is at the expense of machinability. Researchers are therefore actively searching for improved cutting technologies to improve production rates for Ti-6Al-4V. At higher cutting speeds than the industry norm of 60 - 90 m/min, machining becomes a challenge, resulting in low productivity on titanium parts. The limiting factor in the machining of Ti-6Al-4V is high tool temperatures of the order of 1000oC, caused by its resistance to absorb heat and good mechanical strength at elevated temperatures. The result is extreme temperatures that are concentrated on the cutting edge of the tool. The challenge to improve the tool life is therefore focused on removing heat from the insert. Liquid nitrogen was identified as a good candidate as coolant with the additional advantage of being environmentally friendly. The research presented investigates the use of a gravity feed enclosed liquid nitrogen cooling system to improve the tool life of the cutting inserts. The liquid nitrogen is contained on the insert rake face by means of a tool cap. To improve the effectiveness of the cooling method, a polycrystalline diamond (PCD) insert was used. This insert has a considerably higher thermal conductivity that aids in cooling the cutting edge. Tungsten carbide inserts are used for benchmark testing. The round tungsten carbide inserts with conventional cooling performed exceptionally well for machining titanium compared to square inserts, yielding exceptional tool life improvements while significantly increasing the material removal rate. Positive results were recorded with the liquid nitrogen cooling system when used with the polycrystalline diamond cutting insert. A number of far reaching performance issues are identified relating to the design of the tool cap that hindered clear scientific outputs. From a research perspective, the project makes a contribution to the knowledge base in this field. Additionally a new approach in cooling was investigated, resulting in clear indications of design changes required.
AFRIKAANSE OPSOMMING: Die lugvaart industrie streef aktief innovasie na, veral op die gebied van materiale en hul gebruike, om hul vliegtuie en kompeterende posisie in die mark te verbeter. Ti-6Al-4V is al vir meer as 50 jaar beskikbaar. ‘n Drastiese verhoging in die aanvraag na Ti-6Al-4V deur die lugvaart, motor en chemiese industrieë word verwag wanneer die volgende geslag vliegtuie wat koolstofvesel as strukturele materiaal begin gebruik, in produksie gaan. Die materiaal het beter materiaaleienskappe as konvensionele materiale soos staal en aluminium, maar dit kom egter teen die prys van masjieneerbaarheid. Ti-6Al-4V se masjienering bo die industrie norm van 60 – 90m/min is ‘n groot uitdaging. Navorsers soek daarom deurentyd na verbeterde sny tegnologieë om die produksie tempo van Ti-6Al-4V te verbeter. Die beperkende faktor vir Ti-6Al-4V masjienering is die temperatuur wat genereer word. Die weerstand van die materiaal om hitte te absorbeer en sy goeie meganiese eienskappe veroorsaak dat temperature in die beitel 1000oC bereik. Hierdie temperature word egter op die snykant van die beitel gekonsentreer. Die uitdaging is dus om hierdie temperature in die beitel te beheer. Vloeibare stikstof is geïdentifiseer as ‘n goeie kandidaat vir verkoeling met die bykomende voordeel dat dit omgewingsvriendelik is. Die navorsing wat hier uiteengesit word, ondersoek die gebruik van ‘n geslote kamer beitelverkoelingstelsel wat deur gravitasie met vloeibare stikstof voorsien word om die beitel leeftyd te verbeter. Die oppervlak van die beitel word in hierdie konsep direk aan die vloeibare stikstof blootgestel. Om die effektiwiteit van die stelsel te verbeter word van PCD beitels gebruik gemaak. Die beitel se verbeterde hittegeleidingsvermoë help om die beitel se snykant koel te hou. Tungstenkarbied beitels word gebruik om ‘n standaard te stel vir eksperimentele analise. Die ronde tungstenkarbied beitels en konvensionele verkoeling het verstommend goed presteer vir Ti-6A-4V masjienering in vergelyking met vierkantige beitels. Die materiaalverwyderingstempo is aansienlik verhoog sonder om die beitel se leeftyd in te boet. Positiewe resultate is waargeneem met die vloeibare stikstof sisteem saam met die PCD beitels. ‘n Aantal verreikende uitdagings is geïdentifiseer wat suiwer wetenskaplike afleidings bemoeilik. Hierdie probleme kan almal aan die ontwerp van die toerusting toegeskryf word. Die werk lewer egter steeds ‘n bydrae tot die kennis in die veld. ‘n Bykomende benadering vir verkoeling is ondersoek wat duidelik ontwerp-veranderings aandui.
14
Novák, Martin. "KONTROLA POVRCHOVÝCH VAD BROUŠENÝCH POVRCHŮ." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227941.
Full textAbstract:
This diploma is focused on analyse existing method usable for detection surface defects of grindling surface. Also suggests and practically testing new method for detection surface defects of grindling surface
15
Irshad, Muhammad Aatif. "The effect of prior austenite grain size on the machinability of a pre-hardened mold steel. : Measurement of average grain size using experimental methods and empirical models." Thesis, Karlstads universitet, Avdelningen för maskin- och materialteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-8777.
Full textAbstract:
The use of pre-hardened mold steels has increased appreciably over the years; more than 80% of the plastic mold steels are used in pre-hardened condition. These steels are delivered to the customer in finished state i.e. there is no need of any post treatment. With hardness around ~40HRC, they have properties such as good polishability, good weldability, corrosion resistance and thermal conductivity. Machinability is a very important parameter in pre-hardened mold steels as it has a direct impact on the cost of the mold. In normal machining operations involving intricate or near net shapes, machining constitutes around 60% of the total mold cost. Efforts are underway to explore every possible way to reduce costs associated with machining and to make production more economical. All the possible parameters which are considered to affect the machinability are being investigated by the researchers. This thesis work focuses on the effect of prior austenite grain size on the machinability of pre-hardened mold steel (Uddeholm Nimax). Austenitizing temperatures and holding times were varied to obtain varying grain sized microstructures in different samples of the same material. As it was difficult to delineate prior-austenite grain boundaries, experimental and empirical methods were employed to obtain reference values. These different grain sized samples were thereafter subjected to machining tests, using two sets of cutting parameters. Maximum flank wear depth=0.2mm was defined for one series of test which were more akin to rough machining, and machining length of 43200mm or maximum wear depth=0.2mm were defined for second series of tests which were similar to finishing machining. The results were obtained after careful quantative and qualitative analysis of cutting tools. The results obtained for Uddeholm Nimax seemed to indicate that larger grain sized material was easier to machine. However, factors such as retained austenite content and work hardening on machined surface, which lead to degradation of machining operations were also taken into consideration. Uddeholm Nimax showed better machinability in large grained samples as retained austenite(less than 2%) content was minimal in the large grained sample. Small grained sample in Uddeholm Nimax had a higher retained austenite (7+2%) which resulted in degradation of machining operation and a lesser cutting tool life.
16
Uličný, Roman. "Technologie výroby dílu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402533.
Full textAbstract:
This work deals with the production technology of the plastic part for battery modules. First chapter contains analyzis of fundamental methods of machining, where are general informations about technologies which are used in the company with which one is work cooperated. In the second chapter is solved description of manufactured part and its technological aspects for the production. Next chapter is dedicated for introducing the company and its technological possibilities for the manufacturing. The rest part of the work is dedicated for designing production of the semi-finished product and clamping of the semi-finished product. With the selected variant is solved production technology of the part, where are indicated technological solutions of each operations and production process. In the end is realized technological-economic valorization, where is solved service of more machines and judged cost for production of designed variants.
17
Yurtseven, Saygin. "Analysis Of The Influence Of Non-machining Process Parameters On Product Quality By Experimental Design And Statistical Analysis." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1026863/index.pdf.
Full textAbstract:
This thesis illustrates analysis of the influence of the non-machining processes on product quality by experimental design and statistical analysis. For the analysis objectivedishwasher production in Arcelik Dishwasher plant is examined. Sheet metal forming processes of dishwasher production constitutes the greatest portion of production cost and using the Pareto analysis technique
four pieces among twenty six pieces are determined to be investigated. These four pieces are the U Sheet, L Sheet, Inner Door and Side Panel of the dishwasher. By the help of the flow diagrams production process of the determined pieces are defined. Brainstorming technique and cause&
effect diagrams are used to determine which non-machining process parameters can cause pieces to be scrapped. These parameters are used as control factors in experimental design. Taguchi&
#8217
s L16(215) orthogonal array, Taguchi&
#8217
s L16(215) orthogonal array using S/N transformation and 28-4 fractional factorial design are used on purpose. With repetitions and confirmation experiments the effective parameters are determined and optimum level of these parameters are defined for the improvements on scrap quantity and quality of production.
18
Gvizd, Michal. "Kamerový systém při drátové elektroerozi." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231985.
Full textAbstract:
The thesis discusses an unconventional technology of wire-cut electro discharge machining. In the beginning there is a description of the basic principle, the fundamentals of electro discharge machining and its technological application. Further chapters characterise the wire-cut electro discharge machining, the wire electrodes used, the main parts of the machine, the cutting conditions and the advantages of this technology. The practical part is focused on the possibilities of the camera system during the production on a wire cutting machine and the comparison of nowaday´s machines in the manufacture of precise cutting tools in the middle-sized tool-room.
19
Kresa, Jakub. "Studie obrábění keramických materiálů broušením." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231435.
Full textAbstract:
This thesis is focused on ceramics materials in terms of their partition, properties, structure, manufacture and methods of their possible machining. The first part of this thesis is devoted to the distribution of ceramics materials, their structure, properties, and methods of production. Currently, ceramics materials are increasingly used in structural (engineering) applications therefore we deal with methods of effective machining of ceramic materials, to achieve part of the required shape, dimensions and surface quality. The evaluation of ceramic grinding test from the point of view of cutting forces and surface quality of the machined faces are presented in the last part of the thesis. The tested materials have been provided by company SEEIF Ceramics a.s.
20
Šrenk, Jakub. "Návrh a realizace CO2 Laseru s výkonem do 100W." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444270.
Full textAbstract:
This work is focused on the problematics of small CO2 lasers and their possible use for commercial production. The first part describes devices available on the market and evaluation of their parameters. The practical part specifies the parameters that arise from the potential use of technology. Based on these parameters, design of the machine and its complete mechanical design are elaborated. Furthermore, the experimental part deals with the design of structural components, control system, electrical systems and in general a complex technical-technological solution of the equipment, including economic evaluation of the design. Part of the work is also the construction of the machine itself, including activation, adjustment and debugging for the considered production. The constructed machine was subject to testing to ensure required quality of production.
21
Колесник, Виталий Александрович. "Технологическое обеспечение качества при сверлении цилиндрических отверстий в пакетах "углепластик/титановый сплав"." Thesis, НТУ "ХПИ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21494.
Full textAbstract:
Диссертация на соискание ученой степени кандидата технических наук по специальности 05.02.08 – технология машиностроения. – Национальный технический университет "Харьковский политехнический институт", 2016 г.
Диссертация посвящена решению проблеме снижения технологической себестоимости формирования цилиндрических отверстий в пакетах углепластик/ титановый сплав. Основная идея работы заключается в научном обосновании однопроходной технологии обработки пакетов углепластик/ титановый сплав, обеспечивающей формирование отверстий на уровне конструкторских требований. Для исследования влияния технологических параметров (V, S) на показатели размерной точности и качества отверстий в пакетах углепластик / титановый сплав были выполнены измерения осевой силы и температуры на вращающейся сверле методом искусственной термопары по средствам беспроводной измерительной системы. Аппроксимируя, методом наименьших квадратов, результаты экспериментальных исследований получены математические модели влияния технологических факторов (скоростей резания от 15 до 65 м/мин и подаче от 0,02 до 0,08 мм/об) на осевую силу, температуру резания, размерную точность, расслаивание и шероховатость поверхности в отверстиях пакета углепластик/ титановый сплав. Полученные результаты позволили установить сочетание скорости резания и подачи, которые позволят обеспечить обработку отверстий по H9 по наименьшей технологической себестоимости.Thesis for scientific degree of Candidate of Technical sciences on specialty 05.02.08 – Mechanical engineering technologies. – National Technical University "Kharkiv Polytechnic Institute", 2016. Dissertation is devoted to solving the problem of reducing the cost of the process of formation of cylindrical holes in CFRP / Titanium alloy stacks. The basic idea is scientific substantiation single-pass stacks processing technology CFRP / titanium alloy that ensures the formation of holes at the level of design requirements. These mathematical relationships influence of cutting speed and feed on the cutting temperature, surface roughness and precision holes and tool wear, which allowed to investigate its effect on the nature and mechanisms of quality indicators of the holes in stacks. The results allow us to establish the combination of cutting speed, feed that will ensure that the holes on the H9 at the lowest cost technology.
22
Колесник, Віталій Олександрович. "Технологічне забезпечення якості при свердлінні циліндричних отворів в пакетах "вуглепластик/титановий сплав"." Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21493.
Full textAbstract:
Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.02.08 – технологія машинобудування. – Національний технічний університет "Харківський політехнічний інститут", 2016 р.
Дисертація присвячена вирішенню проблемі зниження технологічної собівартості формування циліндричних отворів в пакетах вуглепластик/ титановий сплав. Основна ідея роботи полягає у науковому обґрунтуванні однопрохідної технології обробки пакетів вуглепластик/ титановий сплав, яка б забезпечувала формування отворів на рівні конструкторських вимог. Одержані регресійні математичні моделі впливу швидкості різання та подачі на температуру різання, шорсткість та точність отворів та зношення різального інструменту, що дозволило дослідити її вплив на характер і механізми формування якісних показників отворів у пакетах. Отримані результати дозволяють встановити поєднання швидкості різання, подачі, які дозволять забезпечити виконання отворів по H9 за найменшою технологічною собівартістю.Thesis for scientific degree of Candidate of Technical sciences on specialty 05.02.08 – Mechanical engineering technologies. – National Technical University "Kharkiv Polytechnic Institute", 2016. Dissertation is devoted to solving the problem of reducing the cost of the process of formation of cylindrical holes in CFRP / Titanium alloy stacks. The basic idea is scientific substantiation single-pass stacks processing technology CFRP / titanium alloy that ensures the formation of holes at the level of design requirements. These mathematical relationships influence of cutting speed and feed on the cutting temperature, surface roughness and precision holes and tool wear, which allowed to investigate its effect on the nature and mechanisms of quality indicators of the holes in stacks. The results allow us to establish the combination of cutting speed, feed that will ensure that the holes on the H9 at the lowest cost technology.
23
Filípek, Timotej. "Obrábění těžkoobrobitelných materiálů dokončovacími technologiemi." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444264.
Full textAbstract:
The Master‘s thesis focuses on processing of hard-to-machine materials by the finishing machining methods. The first chapter comprises division and characteristics of finishing technologies in the field of machining processes. The chapter following includes division and characteristics of the hard-to-machine materials. The experimental part – another significant part of the thesis – is focused on grinding of mostly bearing rings made of hard-to-machine materials. The aim of the experimental part is to compare and subsequently assess the use of various kinds of grinding wheels in the grinding process of a given workpiece material. Several parameters are examined from the technological and economic point of view. The assessment of the experimental part provides an overview on the advantages and disadvantages of the use of the grinding wheels in the grinding process of a given material for large-scale production. The conclusion is a summary of the results obtained in the experimental part.
24
Pattavanitch, Jitti. "Numerical and experimental investigations into electrochemical machining." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/numerical-and-experimental-investigations-into-electrochemical-machining(dc33039b-cbad-4a65-8660-3a0abc72f465).html.
Full textAbstract:
This thesis presents numerical and experimental investigations into Electrochemical Machining (ECM). The aim is to develop a computer program to predict the shape of a workpiece machined by the ECM process. The program is able to simulate various applications of EC machining which are drilling, milling, turning and shaped tube electrochemical drilling (STED). The program has been developed in a MATLAB environment. In this present work, EC-drilling, EC-milling and EC-turning are analysed as three-dimensional problems whereas STED is simulated in two-dimensions. Experiments have been carried out to verify the accuracy of the predicted results in the cases of EC-milling and EC-turning. The ECM modeller is based on the boundary element method (BEM) and uses Laplace's equation to determine the current distribution at nodes on the workpiece surface. In 3D, the surfaces of the tool and the workpiece are discretised into continuous linear triangular element types whereas in 2D, the boundaries of the tool and workpiece are discretised into linear elements. The ECM modeller is completely self-contained, i.e. it does not rely on any other commercial package. The program contains modules to automatically discretize the surfaces/boundaries of the tool and workpiece. Since the simulation of the ECM process is a temporal problem, several time steps are required to obtain the final workpiece shape. At the end of each time step, the shape of the workpiece is calculated using Faraday's laws. However, the workpiece's shape changes with progressing time steps causing the elements to become stretched and distorted. Mesh refinement techniques are built in the ECM modeller, and these subdivide the mesh automatically when necessary.The effect of time step on the predicted 3D shape of a hole in EC-drilling is investigated. The effect of discontinuity in the slope between neighbouring elements is also studied. Results obtained from the ECM modeller are compared with 2D analytical results to verify the accuracy that can be obtained from the ECM modeller. Milling features ranging from a simple slot to a pocket with a complex protrusion were machined in order to determine the feasibility of the EC milling process. These features were machined on a 3-axes CNC machine converted to permit EC milling. The effect of tool geometry, tool feed rate, applied voltage and step-over distances on the dimensions, shape and surface finish of the machined features were investigated. A pocket with a human shape protrusion was machined using two different types of tool paths, namely contour-parallel and zig-zag. Both types resulted in the base surface of the pocket being concave and the final dimensions of the pockets are compared with the design drawing to determine the effect of tool path type on the accuracy of machining. The ECM modeller was used to simulate the machining of a thin-walled turned component. The machining parameters, i.e. initial gap, rotational speed, and applied voltage, were specified by the collaborating company. Since only a small amount of material had to be removed from the thin-walled component, the tool was held stationary i.e. a feed in the radial or longitudinal direction was not required. By taking advantage of the axi-symmetric nature of a turned component, only a sector of the component was analysed thereby reducing the computing time considerably. The accuracy of the modeller was verified by comparing the predicted time to machine the thin-walled component with the actual machining time. The initial investigations in STED were both experimental and numerical in nature and they studied the effect of applied voltage, tool feed rate and electrolyte pressure on the dimensions of the holes. Later investigations were numerical and an iterative methodology has been developed to calculate a set of feed rates which could machine a specified turbulator shape.
25
Jašíček, Radek. "Projekt výrobní linky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254310.
Full textAbstract:
This thesis describes the methods and procedures used in designing production lines, focusing on the production line for machining of train wheels. The thesis also describes the basic types of railway wheels, their design and important design elements. It also deals with the complete manufacturing process of train wheel from material selection through the technological processes of forming, heat treatment, mechanical tests, machining and non-destructive testing and measuring. Suitable equipment for the construction of automatic lines for machining, inspection and measurement of train wheels is selected according to the specified parameters of the wheel types, manufacturing productivity and production shop dimensions, These devices include vertical machining center, single-purpose machine for grease outlet drilling, device for ultrasonic inspection, magnetic particle inspecton device, measuring station and train wheel balancing machine. Several variants of the production line including detailed specification of manipulation cycle times is created. These variants are mutually compared and evaluated to find the optimal solution.
26
Reams, Michael Lee Anthony. "An expedient method for performance evaluation of machining fixtures." Thesis, Georgia Institute of Technology, 1996. http://hdl.handle.net/1853/18925.
Full text
27
Lau, Pak Fai. "CNC machining accuracy enhancement by tool path compensation method /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202005%20LAU.
Full text
28
Pavézka, Vladimír. "Analýza dokončovacích způsobů obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229963.
Full textAbstract:
This eleborate study is aimed at analysis of complete methods machining. There are characterized particular methods and their effect on the surface´s quality of machined area in this study. Concluding part of the study includes practical demonstration of machining by using cemented carbide-tipped tool and polycrystalline diamond and evaluation of this demonstration.
29
Yeow, Jee Leong. "Prediction of machined parts distortion by the finite element method." Thesis, University of Salford, 2001. http://usir.salford.ac.uk/43017/.
Full textAbstract:
To manufacture a high precision component, the aircraft industry in particular, employs computer numerical control machining to produce the aircraft components. However, it has often been found that problems of distortion occur when thin and slender components are manufactured this way. It is believed that the distortion arises due to the re-distribution of the residual stress field that was present in the original component in addition to the effects of cutting forces and temperatures that were induced during the machining process. At present, the process to produce a component with acceptable tolerance limits is one of trial and error. This often consumes a lot of time and produces considerable material wastage. The finite element method has been used to develop a methodology to model the actual machining process that produced the aircraft component. The finite element model that has been developed so far was able to demonstrate the effects of redistribution of the residual stresses on the distortion of the final machined component. It was found that the final component distorted differently when the materials were simply removed from a solid billet with different material removal sequences. A preliminary investigation on the effects of cutting temperature and forces has also been made. The investigation showed that such effects could not be totally ignored as they significantly affect the distortion of the final component. In addition to modelling the machining process, a methodology has also been developed to introduce and simulate the clamps and machine worktable that are part of the machining process. Although there is a considerable amount of work relating to modelling machining processes, there has not been any previous attempt to address the problem as a whole as described in this thesis. It is hope that the work undertaken here would be able to provide a stepping-stone to such attempts in future. However, further experimental data would be required to complement a more refined model in the attempt to accurately predict the distortion in machined components. It is believed that it would be possible to then extend the developed methodology to minimise the distortion by changing the machining sequence and the shape of the material to be removed. This would reduce the timescales involved to correct the problems of distortion and eliminate material wastage.
30
Brym, Radek. "Trendy vývoje obrábění vodním paprskem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228165.
Full textAbstract:
In diploma thesis there is elaborated the analysis of assumed development of water jet technology and there is analyzed the level of water jet method in production. There are introduced the possibilities of new applications of water jet machining and the possibilities of it’s future development. There is think over the enlargement of this method in next 5 years. Simultaneously there is solved the question of techno economic operation severity of this technology.
31
Ekmekci, Bulent. "Theoretical And Experimental Investigation Of Residual Stresses In Electric Discharge Machining." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1138189/index.pdf.
Full textAbstract:
Electric Discharge Machining (EDM) is a process for eroding and removing material by transient action of electric sparks on electrically conductive materials immersed in a dielectric liquid and separated by a small gap. A spark-eroded surface is a surface with matt appearance and random distribution of overlapping craters. It is mechanically hard and stressed close to ultimate tensile strength of the material and sometimes covered with a network of micro cracks. The violent nature of the process leads a unique structure on the machined surface and generates residual stresses due mainly to the non-homogeneity of heat flow and metallurgical transformations.
An extensive experimental study is presented to explore the surface and sub-surface characteristics together with the residual stresses induced by the process. Layer removal method is used to measure the residual stress profile in function of depth beneath. A finite element based model is proposed to determine residual stresses and compared with the experimental results.
The residual stress pattern is found to be unchanged with respect to machining parameters. Thus, a unit amplitude shape function representing change in curvature with respect to removal depth is proposed. The proposed form is found as a special form of Gauss Distribution, which is the sum of two Gaussian peaks, with the same amplitude and pulse width but opposite center location that is represented by three constant coefficients. In each case, agreement with the proposed form is established with experimental results. Results have shown that these coefficients have a power functional dependency with respect to released energy.
32
Narayanan, O. H. "Solutions to some shape problems in electrochemical machining using the boundary element method." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488032.
Full textAbstract:
This work aims to show that the Boundary Element Method (BEM) is ideally suited for two-dimensionaL prediction of workpiece shapes for given tooling, and evaluation of tool profiles for known workpiece forms in Electrochemical Machining (ECM). A critical review of existing techniques for modelling ECM is presented which is followed by a resume of BEM. A few 'static' potential problems are analysed using BEM programs with constant, linear and quadratic elements before concentrating upon the two. ECM shape probLems. A number of complex-shaped tool profiles are used for simuLated ECM ceLLs. The effects of boundary mesh and time step size, eLement type and method of moving the work boundary upon accuracy of the resulting work profile are examined. The capabilities of the BEM based model to cater for over-potential and variable eLectrolyte conductivity conditions are also considered. Computed work shapes are shown to correlate well with exact and experimental solutions obtained from various sources. In some cases, BEM is shown to be superior to other established numerical techniques. Evaluation of tool profiles in this work is limited to fully conducting profiles only. It is iterative in nature and uses the approximate cos θ method to initiate the. procedure. Subsequent iterations employ formulations developed herein to correct tool profile to satisfy work boundary conditions. Effects of element type and merits of specifying different boundary conditions on the work surface are assessed. Computed tool profiles, when used in the machining model, are shown to yield desired workpiece shapes. Finally, general conclusions and a few suggestions for 'future research complete the thesis.
33
Wang, Nan. "Tool path generation method for 5-axis NC machining with flat-end cutter /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?MECH%202009%20WANG.
Full text
34
Liou, Jiann-Haw. "Study of stress developments in axi-symmetric products fabricated by forging and machining /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9737869.
Full text
35
Barrios, André Nozomu Sadoyama. "Metodologia para estimativas de fluxo de calor na peça em operações de fresamento." Universidade Tecnológica Federal do Paraná, 2018. http://repositorio.utfpr.edu.br/jspui/handle/1/3147.
Full textAbstract:
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Um dos processos de usinagem com maior emprego na indústria é o fresamento. O estudo da área térmica no fresamento é um desafio, por ser um processo em que o corte ocorre numa região bem específica de difícil acesso para sua correta mensuração. Uma das soluções para análise da temperatura no processo de usinagem é a utilização de modelos térmicos resolvidos por métodos matemáticos que trazem boas estimativas. Atualmente, além dos softwares desenvolvidos no ambiente acadêmico, existem também ferramentas computacionais disponíveis no mercado. Entretanto, os softwares comerciais apresentam código de programação fechado o que dificulta estudos mais específicos para casos particulares. Por meio de busca em vários autores, tanto em trabalhos no contexto de torneamento quanto para fresamento, notou-se que a utilização do método de resolução inversa por Gauss-Newton para estimativas de fluxo de calor ainda é muito restrita. Nos trabalhos de Braghini Junior (2002) e do próprio autor em Barrios (2013) este método foi implementado, porém a metodologia foi para estimativas apenas do fluxo de calor médio, desprezando a variação do fluxo de calor em função do deslocamento da ferramenta pelo tempo. O objetivo deste trabalho é desenvolver uma nova metodologia para realizar estimativas de fluxo de calor na peça em operações de usinagem por fresamento considerando os efeitos do deslocamento da ferramenta em função do tempo utilizando o método de Gauss-Newton. Para isso foi necessário desenvolver um Simulador Térmico de Usinagem por Fresamento (STUF), analisar os efeitos das variáveis adotadas no simulador e por fim realizar estimativas de fluxo de calor por meio dos dados de temperatura experimental de usinagem. Foram criadas duas interfaces para o STUF, sendo uma interface para as estimativas de fluxo de calor e uma interface para as estimativas de temperatura na peça. Para este fim, o Matlab® foi utilizado como ambiente computacional e como linguagem de programação para as simulações. Os efeitos das variáveis no simulador como o coeficiente convectivo (h), refino de malha, passo do tempo (Δt), geometria da peça, temperatura experimental e análise de erro foram analisados. Foi possível realizar estimativas de fluxo de calor e temperatura na peça por meio do estudo de caso 1, utilizando os dados experimentais de Braghini (2002), estudo de caso 2, por meio dos dados experimentais de Barrios (2013), e estudo de caso 3, por meio dos dados experimentais proposto por este trabalho. Essa nova metodologia empregada por meio do STUF permitiu a identificação do fluxo de calor máximo na peça, possibilitou a geração de resultados de temperaturas estimadas com bons ajustes com as temperaturas experimentais com R² médio de 0,85 para estudo de caso 1 e R² de 0,95 para estudo de caso 2. O estudo de caso 3 apresentou muitos ruídos, porém foram possíveis as estimativas.
One of the most widely used machining processes in the industry is milling. The study of the thermal area in the milling is a challenge, because it is a process in which the cutting occurs in a very specific region of difficult access for its correct measurement. One of the solutions for the analysis of the temperature in the machining process is the use of thermal models solved by mathematical methods that bring good estimates. Currently, besides the software developed in the academic environment, there are also computational tools available in the market. However, commercial software presents closed programming code which makes it difficult to study more specifically for particular cases. Through the search of several authors, both in work in the context of turning and in milling, it was noticed that the use of the inverse resolution method by Gauss-Newton for estimates of heat flow is still very restricted. In the works by Braghini Junior (2002) and by the author himself in Barrios (2013) this method was implemented, but the methodology was only for estimates of the average heat flux, neglecting the variation of the heat flow as a function of the time displacement of the tool . The objective of this work is to develop a new methodology for estimating the heat flux in the part in milling operations considering the effects of tool displacement as a function of time using the GaussNewton method. For this, it was necessary to develop a Thermal Simulator for Machining by Milling (STUF), to analyze the effects of the variables adopted in the simulator and finally to make estimates of heat flux through the experimental temperature data of machining. Two interfaces were created for the STUF, being an interface for the estimations of heat flow and an interface for the temperature estimates in the part. For this purpose, Matlab® was used as a computational environment and as a programming language for simulations. The effects of the variables in the simulator, such as the convective coefficient (h), mesh refining, time step (Δt), part geometry, experimental temperature and error analysis were analyzed. It was possible to estimate heat flux and temperature in the piece by means of the case study 1, using the Braghini (2002) experimental data, case study 2, through the experimental data of Barrios (2013), and case study 3, through the experimental data proposed by this work. This new methodology used by the STUF allowed the identification of the maximum heat flux in the part, allowed the generation of estimated temperature results with good adjustments with the experimental temperatures with mean R² of 0.85 for case study 1 and R² of 0,95 for case study 2. Case study 3 presented many noises, but estimates were possible.
36
Long, Craig Stephen. "Optimal structural design for a planar parallel platform for machining." Diss., Pretoria : [S.n], 2002. http://upetd.up.ac.za/thesis/available/etd-11302005-093541/.
Full text
37
Harmon, Aaron. "Development of learning objectives for an undergraduate electrical discharge machining technology course using the Delphi technique /." View online, 2009. http://repository.eiu.edu/theses/docs/32211131566692.pdf.
Full text
38
Jurán, Antonín. "Efektivní obrábění nových konstrukčních keramických materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228424.
Full textAbstract:
The objective of this diploma thesis are new design materials in a view of their structure, properties, manufacture,partitions, applications and possibili-ties of effective machining them Ceramics are used in the field of design applications more often than before. They are in form of compact parts and in form of thin coatings on the surface of metal parts. Fast development of constructive applications requires the same progress rate of machining ma-chines innovations and development of new methods of effective machining these materials, too. The aim is to produce parts of demanded shapes, dimensions and surface quality at affordable costs. Ceramics guarantee long terming durability and reliability. The evaluation of ceramics grinding tests from the point of view of cutting forces and surface quality of the machined faces are presented in the last part of the diploma thesis.
39
Alan, Salih. "Development Of A Fast Analytical Method For Prediction Of Part Dynamics In Machining Stability Analysis." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12611096/index.pdf.
Full textAbstract:
The objective of this study is to develop and implement practical and accurate methods for prediction of the workpiece dynamics during a complete machining cycle of the workpiece, so that FRFs of the workpiece can be used in chatter stability analysis. For this purpose, a structural modification method is used since it is an efficient tool for updating FRFs due to structural modifications. The removed mass is considered as a structural modification to the finished workpiece in order to determine the FRFs at different stages of the process. The method is implemented in a computer code and demonstrated on representative parts such as turbine blades. The predictions are compared and verified with the data obtained using FEA. The FRFs are used in chatter stability analyses, and the effect of part dynamics on stability is studied.
40
Costa, Gonçalo José Rodrigues. "Experimental investigation of EDM parameters on machining AIMg10 15%SiC composite based on Taguchi method." Master's thesis, Universidade de Aveiro, 2013. http://hdl.handle.net/10773/11347.
Full textAbstract:
Mestrado em Engenharia MecânicaO objetivo do estudo é investigar os efeitos da corrente de pico, servo voltagem, pulso on-time e pulso off-time na perfuração por electroerosão da liga de Alumínio Magnésio reforçado com carbonetos de silício e determinar a sua influência num grupo de parâmetros de saída, que incluem a taxa de remoção de material, desgaste do elétrodo, sobre corte radial e conicidade. Para melhor entender o problema experimental e todas as questões que este inclui, em primeiro lugar, foi feita uma revisão da literatura que abrange todos os princípios, tecnologias e aplicações do processo de electroerosão. Os dados para esta pesquisa foram recolhidos no laboratório de tecnologias não convencionais na "Gheorghe Asachi" Universidade Técnica de Iasi. O design de experiencias foi escolhido através do metodo Taguchi, nomeadamente o array L9. O primeiro objetivo desta pesquisa é encontrar a combinação ideal dos níveis de parâmetros através do método de Taguchi. O segundo objetivo é encontrar a contribuição da cada parâmetro de entrada para cada parâmetro de saída usando o método de análise estatística Análise da Variância. Objetivo final é desenvolver um modelo matemático para prever os valores de saída experimentais, através do software GW-Basic. Os resultados mostraram que os parâmetros com uma maior influência sobre a taxa de remoção de material e desgaste dos elétrodos foram a servo voltagem e corrente de pico, com 49% e 24% em relação ao primeiro parâmetro e 84% e 10% em relação ao segundo. O sobre corte radial foi mais influenciado pela corrente de pico e pelo pulso on-time, com 29% e 35%. Relativamente a conicidade, os parâmetros com mais influência foram corrente de pico e o pulso on-time, com 47% e 33% em termos de contribuição. Além disso, os níveis de combinação ótima de parâmetros associadas com a taxa de remoção de material, desgaste dos elétrodos, sobre corte radial e conicidade foram também obtidos. As respostas em estudo podem ser previstas usando os modelos matemáticos com um erro médio de 2% para a taxa de remoção de material, 16% para o desgaste do elétrodo, de 2% para sobre corte radial e 2% para a conicidade.
The purpose of this study is to investigate the effects of peak current, servo voltage, pulse on− time and pulse off − time on electrical discharge drilling of an aluminum magnesium reinforced with particles of silicone carbide and determine their influence on a range of output parameters such as material removal ratio, electrodewear,radial over cut and taper. To better understand the experimental problem and all issues that it includes, firstly, was done a literature review that covers all the electrical discharge machining principals, technologies and applications.The data for this research was collected on the “non conventional“ machining technologies laboratory at “Gheorghe Asachi” Technical University of Iasi. The design of experiments was chosen by Taguchi method, namely, orthogonal array L9.The first goal of this research is to find the optimum parameter level combination through the Taguchi method. The second goal is to find the contribution of the each parameter for each output using the statistic method Analysis of variance. Final goal was to find a mathematical model to predict the experimental output values, through a software GW-Basic. The results shows that the parameters with more influence on material removal ratio and electrode wear responses were servo voltage and peak current, with 49% and 24% regarding the first output and 84% and 10% the second. Radial over cut was more influenced by peak current and pulse on-time, with 29% and 35%, concerning the taper, the parameters with more influence were also peak current and pulse on-time but with 47% and 33% of contribution. In addition, the optimal combination levels of machining parameters associated with material removal rate, electrode wear, radial over cut and taper were also drawn. Responses in study can be predicted using the Mathematical models with a average error of 2% for material removal rate, 16% for electrode wear, 2% for radial over cut and 2% for taper.
41
Івченко, О. В. "Система автоматизованого розрахунку прогнозованих обсягів енерговитрат при проектуванні технологічного процесу обробки деталей." Master's thesis, Сумський державний університет, 2020. https://essuir.sumdu.edu.ua/handle/123456789/82137.
Full textAbstract:
Кваліфікаційна робота магістра становить 97 сторінок, в тому числі 29 рисунків, сім таблиць, бібліографії з 30 джерел на трьох сторінках, одного додатку на восьми аркушах.
Виходячи з актуальності й ступеня наукової розробки проблеми, метою дослідження є підвищення енергетичної ефективності технологічних процесів механічної обробки металів шляхом впровадження системи автоматизованого розрахунку прогнозованих обсягів енерговитрат при його проектуванні на основі розроблення універсального методу обчислення значень питомого показника споживання енергії під час проектування операцій механічної обробки металів різанням.
Об’єкт дослідження: процедура проектування технологічного процесу механічної обробки деталей.
Предмет дослідження: методи обчислення значень питомого показника споживання енергії під час виконання операцій механічної обробки металів різанням.
Наукова новизна отриманих результатів. Вперше запропоновані теоретичні основи універсального методу обчислення значень питомого показника споживання енергії під час виконання операцій механічної обробки металів різанням, які базується на прямих випробуваннях верстатів та визначення ККД устатковання за електроспоживанням під час зміни різних факторів технологічного процесу. Це дозволяє провести нормування обчислень енергетичної ефективності технологічного процесу механічної обробки металу за показником сумарної потужності процесу оброблення.
Практичне значення отриманих результатів: запропоновано рекомендації щодо впровадження системи автоматизованого розрахунку прогнозованих обсягів енерговитрат при проектуванні технологічного процесу обробки деталей.Квалификационная работа магистра составляет 97 страниц, в том числе 29 рисунков, семь таблиц, библиографии из 30 источников на трех страницах, одного приложения на восьми листах. Исходя из актуальности и степени научной разработки проблемы, целью исследования является повышение энергетической эффективности технологических процессов механической обработки металлов путем внедрения системы автоматизированного расчета прогнозируемых объемов энергозатрат при его проектировании на основе разработки универсального метода вычисления значений удельного показателя потребления энергии при проектировании операций механической обработки металлов резанием . Объект исследования: процедура проектирования технологического процесса механической обработки деталей. Предмет исследования: методы вычисления значений удельного показателя потребления энергии во время выполнения операций механической обработки металлов резанием. Научная новизна полученных результатов. Впервые предложены теоретические основы универсального метода вычисления значений удельного показателя потребления энергии во время выполнения операций механической обработки металлов резанием, которые базируется на прямых испытаниях станков и определения КПД оборудования по электропотреблением при изменении различных факторов технологического процесса. Это позволяет провести нормирование вычислений энергетической эффективности технологического процесса механической обработки металла по показателю суммарной мощности процесса обработки. Практическое значение полученных результатов: предложены рекомендации по внедрению системы автоматизированного расчета прогнозируемых объемов энергозатрат при проектировании технологического процесса обработки деталей.
The master's thesis is 97 pages, including 29 figures, seven tables, bibliographies from 30 sources on three pages, one appendix on eight sheets. Based on the relevance and degree of scientific development of the problem, the aim of the study is to increase energy efficiency of technological processes of metal machining by introducing a system of automated calculation of projected energy consumption in its design based on the development of a universal method of calculating specific energy consumption. . Object of research: the procedure for designing the technological process of machining parts. Subject of research: methods of calculating the values of specific energy consumption during the operations of machining of metals by cutting. Scientific novelty of the obtained results. For the first time the theoretical bases of the universal method of calculation of values of specific indicator of energy consumption during performance of operations of mechanical processing of metals by cutting which are based on direct tests of machines and definition of efficiency of the equipment on power consumption at change of various factors of technological process are offered. This allows the rationing of calculations of energy efficiency of the technological process of metal machining according to the total power of the processing. Practical significance of the obtained results: recommendations for the introduction of a system of automated calculation of the projected volumes of energy consumption in the design of the technological process of processing parts are proposed.
42
Bowes, David Christian. "Numerical modelling of ti6A14V machining : a combinded FEA and unified mechanics of cutting approach." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80353.
Full textAbstract:
Thesis (MScEng)--Stellenbosch University, 2013.ENGLISH ABSTRACT: In this study, Ti6Al4V machining is modelled using finite element analysis of orthogonal machining. Orthogonal turning tests are conducted for the verification of FE models in terms of machining forces, temperatures, and chip geometry. Milling force predictions are made using the "unified" mechanics of cutting model which is applied to ball nose milling for this study. The model makes use of orthogonal cutting data, collected from the turning tests, to model milling forces. Model predictions are compared with test data from slot milling tests for verification. Finally a hybrid form of the "‘unified"’ model is presented in which orthogonal data, obtained from the FE simulations, is used to model ball nose milling operations.
AFRIKAANSE OPSOMMING: In hierdie studie word titaanmasjinering (Ti6Al4V) gemodelleer deur gebruik te maak van eindige element analise van ortogonale masjinering. Ortogonale draai toetse word uitgevoer om eindige element (FE) modelle te verifieer in terme van masjineringskragte, temperatuur en spaandergeometrie. Freeskragte word voorspel deur gebruik te maak van die "Unified Mechanics of Cutting" model wat toegepas word op ’n balneusfrees operasie in hierdie studie. Die model maak gebruik van ortogonale snydata, versamel gedurende snytoetse, om die freeskragte te modelleer. Die model word vervolgens vergelyk met die toetsdata afkomstig van die freestoetse vir verifikasie. Ten slotte word ’n hibriede weergawe van die model aangebied waarin ortogonale data verkry word van die FE simulasie om balneus freesoperasies te simuleer.
43
Madola, Ondrej. "NÁVRH KŘÍDLA PRO LETOUN KATEGORIE CS LSA." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231206.
Full textAbstract:
The aim of the thesis is design and technological design of wing with significant reduction manual work and number of preparations in preparing part of structures. The first part of the work is to explanation the issues and machining metal parts forming wings and also the use of CAD systems. The next section describes several design proposals wings, strength test and compare price and weight of main girders with breams made of L-profiles. Followed by the technological process of production individual part design and control hems of sheet metal part design. The conclusion is dedicated to building assembler wings.
44
Liang, Hong. "Minimum error tool path generation method and an interpolator design technique for ultra-precision multiaxis CNC machining." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0021/NQ43585.pdf.
Full text
45
Tan, Wei Yung. "Developing an improved production planning method for a machining cell using an active-nondelay hybrid scheduling technique." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62509.
Full textAbstract:
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 61).
We examine the production planning and scheduling of a job shop environment of a machining cell in a manufacturing facility. This thesis addresses the scheduling limitations in the machining cell that can result in unbalanced loading and idling of machines as well as longer manufacturing lead times. A method was developed to use Microsoft Project 2007 as a tool to enable dynamic production planning and control in the shop floor. In order for a proper model to be set up, relevant observations were made and required data collected. In Microsoft Project, work orders were scheduled using an active-nondelay hybrid scheduling technique. This technique resulted in short makespan with high machine utilization, low average waiting time, and low WIP. Simulated manufacturing lead times were also reduced to an average of 1.5 weeks compared to current manufacturing lead times of about 3 - 4 weeks, showing significant improvement. Further observations revealed that machine utilizations could not be balanced further than what was achieved without changing the machine routings of the components. Alternatively, if process times on the bottleneck machine could be reduced, more balanced loads could be achieved as well. If recommendations to the company were implemented, we expect that there will be an increase in the overall machining cell output capacity and a reduction in overall manufacturing lead times and WIP levels due to shorter processing times, higher machine utilizations, and better production planning.
by Wei Yung Tan.
M.Eng.
46
Al-Zkeri, Ibrahim Abdullah. "Finite element modeling of hard turning." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1181928433.
Full text
47
Sartkulvanich, Partchapol. "Determination of material properties for use in FEM simulations of machining and roller burnishing." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1167412216.
Full text
48
LIN, LI-DE, and 林立德. "Efficient Error Description Methods for Contour Machining." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/71335667242776059896.
Full text
49
Sun, En Ding, and 孫彥鼎. "Study of Properties and Machining Methods of High Toughness Ceramics." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/57783507887418581580.
Full textAbstract:
碩士長庚大學
機械工程學系
103
Generally speaking, ceramic materials have attractive characteristics such as high hardness, good corrosion resistance, excellent elevated temperature strength, and low density. Due to these superior properties, ceramics have been widely used in our daily lives and various industries. However, the brittle characteristic of ceramics has not been overcome yet and has greatly limited the applications of ceramics. In the research paper by Y.L. Chen et al. : Methodology of Improving Toughness of Ceramics, authors haven't completed the development of all characteristics of the high toughness ceramic. Therefore, the focus of this research is to continue to study the mechanical properties of high toughness ceramic and process parameter optimization. Moreover, the effects of diffusion layers of different thicknesses on toughness of this high toughness ceramic is evaluated. The results show that the fully diffused ceramic exhibits 255% improvement in toughness compared to the untreated, conventional S26 ceramic. The semi-diffused sample (84% diffused in overall cross section) exhibits only 55% improvement in toughness. When ceramic samples are thicker than 2 mm, they are prone to cracking during the processing. Consequently, this cracking will lead to a substantial reduction in the toughness of ceramics. Various manufacturing methods were used to machine this high toughness ceramic. It was found that the fully-diffused high toughness ceramic material exhibited improved machinability than the conventional ceramics.
50
Huang, Jain-Jr, and 黃建智. "Improving Performance of a Bridge Type Machining Center Using Optimization Methods." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/35010484252795450691.
Full textAbstract:
碩士國立中興大學
機械工程學系所
96
The purpose of this study is to improve the performance of a bridge type machining center. The changes are made up the ribs within same substructures. The objective is to increase the stiffness of the structure as well as to minimize the weight. The original design is analyzed first to understand its performance. According to the results, the working table, the bridge, and the base structures are selected to be modified. The topology and sizing optimization techniques are used to optimize the structure. MSC.Nastran is used for finite element analysis. The design space containing the original ribs is used as the design space for topology optimization. Solid elements are created within this space and these elements will form optimum reinforced structure by using topology optimization. The sizing optimization will change the thicknesses of the original ribs to optimum values. In comparison with the original design, the static and dynamic performance of some substructures is improved. The structural weight is also reduced. In general, if the topology optimization can be successfully applied in a design space, the solution by topology optimization will be better than that by sizing optimization.