Dissertations / Theses on the topic 'Machining methods'
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Hussein, Wessam Mahmoud Elbestawi Mohamed A. A. Veldhuis Stephen C. "Machining process monitoring using multivariate latent variable methods." *McMaster only, 2007.
Find full textAsante, 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 textRashid, 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 textFayad, 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 textNguyen, Thai. "Development of New Cooling Methods for Grinding." University of Sydney, 2005. http://hdl.handle.net/2123/1689.
Full textThis 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.
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 textBringmann, 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 textQi, Qiang. "INVESTIGATION OF POLISHING METHODS AND SURFACE ANALYSIS AFTER MACHINING AISI 4140 ALLOY STEEL." UKnowledge, 2017. https://uknowledge.uky.edu/me_etds/107.
Full textGärdek, 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 textKunhart, 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 textLemaster, 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 textGašpar, 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 textKoen, 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 textENGLISH 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.
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 textIrshad, 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 textUličný, Roman. "Technologie výroby dílu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402533.
Full textYurtseven, 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 textdishwasher 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.
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 textKresa, 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 textŠrenk, 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 textКолесник, 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 textThesis 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.
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 textThesis 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.
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 textPattavanitch, 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 textJašíček, Radek. "Projekt výrobní linky." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254310.
Full textReams, 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 textLau, 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 textPavézka, 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 textYeow, Jee Leong. "Prediction of machined parts distortion by the finite element method." Thesis, University of Salford, 2001. http://usir.salford.ac.uk/43017/.
Full textBrym, 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 textEkmekci, 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 textNarayanan, 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 textWang, 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 textLiou, 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 textBarrios, 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 textUm 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.
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 textHarmon, 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 textJurán, 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 textAlan, 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 textCosta, 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 textO 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.
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 textКвалификационная 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.
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 textENGLISH 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.
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 textLiang, 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 textTan, 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 textCataloged 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.
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 textSartkulvanich, 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 textLIN, LI-DE, and 林立德. "Efficient Error Description Methods for Contour Machining." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/71335667242776059896.
Full textSun, 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 text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.
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 text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.