Дисертації з теми "Machining chip"
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Hagiwara, Masaya. "OPTIMIZATION OF MACHINING PERFORMANCE IN CONTOUR FINISH TURNING OPERATIONS." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/341.
Повний текст джерелаMahdi, Wathik Issa. "Tool contact stresses and chip formation in metal machining." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254204.
Повний текст джерелаOlajire, Kabiru Ayinde. "Machining of aerospace steel alloys with coated carbides." Thesis, Coventry University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301195.
Повний текст джерелаAvanessian, Alfred. "An analysis of the effect of 3-D groove insert design on chip breaking chart." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-01255-110749/.
Повний текст джерелаZhou, Li. "Machining chip-breaking prediction with grooved inserts in steel turning." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0109102-140803.
Повний текст джерелаZhou, Li. "Machining chip breaking prediction with grooved inserts in steel turning." Link to electronic thesis, 2001. http://www.wpi.edu/Pubs/ETD/Available/etd-0109102-140803.
Повний текст джерелаBrown, Charles Jeremy. "An investigation of tool stresses caused by unsteady chip formations in machining." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236295.
Повний текст джерелаKishawy, Hossam Eldeen A. "Chip formation and surface integrity in high speed machining of hardened steel /." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0003/NQ42858.pdf.
Повний текст джерелаKhatri, Ashutosh Mahesh. "INVESTIGATING TOOL WEAR MECHANISM AND MICROSTRUCTURALCHANGES FOR CONVENTIONAL AND SUSTAINABLE MACHINING OFTITANIUM ALLOY." Miami University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=miami1533287855502478.
Повний текст джерелаVenkatachalam, Sivaramakrishnan. "Predictive Modeling for Ductile Machining of Brittle Materials." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19774.
Повний текст джерелаZhang, Hong. "Plastic deformation and chip formation mechanisms during machining of copper, aluminum and an aluminum matrix composite." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/NQ62306.pdf.
Повний текст джерелаDevotta, Ashwin Moris. "Characterization & modeling of chip flow angle & morphology in 2D & 3D turning process." Licentiate thesis, Högskolan Väst, Forskningsmiljön produktionsteknik(PTW), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-8671.
Повний текст джерелаWince, Jaton Nakia. "Modeling chip formation in orthogonal metal cutting using finite element analysis." Master's thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-07232002-154556.
Повний текст джерелаMenon, Thejas. "Full-field infrared thermography at tool-chip interface through transparent cutting tool while machining TI-6AL-4V." Thesis, Wichita State University, 2013. http://hdl.handle.net/10057/6382.
Повний текст джерелаWong, Darrell. "Particleboard simulation model to improve machined surface quality." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/247.
Повний текст джерелаAamir, Muhammad. "Simultaneous machining of aerospace structural materials using poly-drills." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2021. https://ro.ecu.edu.au/theses/2471.
Повний текст джерелаNiu, Zhichao. "Investigation on the multiscale multiphysics based approach to modelling and analysis of precision machining of metal matrix composites (MMCs) and its application perspectives." Thesis, Brunel University, 2018. http://bura.brunel.ac.uk/handle/2438/17549.
Повний текст джерелаSaillet, Alan. "Implementace a aplikace metody párování obráběných materiálů a břitů při orbitálním vrtání." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-451199.
Повний текст джерелаMiah, Farid. "Numerical and experimental analysis of CFRP machining process in orthogonal cutting." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30005.
Повний текст джерелаThe composite materials, including CFRP (Carbon Fiber Reinforced Polymer), are increasingly used in aeronautics and automotives which is currently raising many complications in the machining processes. As those materials are made with multiple phases, they are accountable for poor machining quality and undesired defects. This thesis seeks to better understand the fundamental physical technique involved in chip formation mechanism in orthogonal cutting of CFRP machining by combined numerical and experimental studies. Then, the analysis focuses to how certain cutting parameters, e.g., cutting depth, affect to the cutting efforts, surface quality, interply delaminations, inner crack generation and to generated chip shape and size. Moreover, an experimental observation has been made to find out the minimum cuttable depth below which the material does not get cut smoothly over the whole surface. This research work has been finished by a preliminary study on cutting tool wear mechanism
Espanhol, Victor. "Análise dos esforços de corte e acabamento superficial no torneamento de aço com ferramenta de superfície lisa e com quebra-cavaco." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2008. http://hdl.handle.net/10183/14374.
Повний текст джерелаThis wark presents the results af machiningpracess tests with different turning tools. Tests were done to evaluate behaviors differenceson cutting efforts and surface finishing in turning operations to a same type of tool, with a variation on rake face, where one had a chipbreaker groove and the other are flat. The machining material was 1045 annealed carbon steel, tested to two different cutting speeds, changing also the depth of cut and the feed rate for each case. The tests were done in a conventionallathe, where the process variances were collected by a data acquisition system, through a piezoelectric dynamometer to evaluate the cut efforts and a portable rugosimeter to measure the surface roughness. The results show a strong reduction of the efforts when grooved tools with chip-breaker were applied as well an improvement on the chip characteristics. In relation to the surface roughness, it was observed a slight improvement when the tlat tool was used, because ofthe conditions of chip remova!.
Liu, Jian. "Experimental study and modeling of mechanical micro-machining of particle reinforced heterogeneous materials." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5408.
Повний текст джерелаPh.D.
Doctorate
Mechanical and Aerospace Engineering
Engineering and Computer Science
Mechanical Engineering
Santaniello, Tommaso. "Hybrid microfluidic devices based on polymeric materials functionalized for cell biology applications." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14933.
Повний текст джерелаHon, Pavel. "Třískové hospodářství obráběcího stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229433.
Повний текст джерелаWolf, Jason. "INVESTIGATION OF CHIP-FORM AND TOOL-WEAR IN TURNING OF HARDENED AF9628 ALLOY UNDER VARIOUS COOLING AND LUBRICATION CONDITIONS." UKnowledge, 2019. https://uknowledge.uky.edu/ms_etds/10.
Повний текст джерелаZvěřina, Martin. "Výpočtová simulace procesu třískového obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229040.
Повний текст джерелаSzlaur, Vít. "Analýza procesů obrábění kovových materiálů se zaměřením na energetické aspekty." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230098.
Повний текст джерелаHradil, Roman. "Návrh technologie výroby vybrané součásti v systému regulace parní turbíny." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318648.
Повний текст джерелаГрущак, Роман Богданович, та Roman Hrushchak. "Дослідження силових факторів при багато різцевому точінні з гарантованим подрібненням зливної стружки". Master's thesis, Тернопільський національний технічний університет імені Івана Пулюя, 2018. http://elartu.tntu.edu.ua/handle/lib/26760.
Повний текст джерелаУ дипломній роботі магістра розглянуті результати досліджень силових факторів, які виникають при багатолезовому точінні, що супроводжується гарантованим подрібненням зливної стружки. Дослідження проведені на прикладі двох різцевої обробки. Метою роботи є підвищення точності і продуктивності обробки при використанні такого багатолезового оснащення. При цьому розроблена класифікація основних видів подрібнення зливної стружки, визначені характеристики зміни силових факторів в процесі багато різцевого точіння, а також проведена порівняльна оцінка зміни осьових складових сил різання при багатолезовому і традиційному точінні на прикладі двох різцевої обробки. Розроблені схеми гарантованого подрібнення зливної стружки при використанні двохрізцевого оснащення. На основі технологічних розрахунків і побудови схем формоутворення визначена базова компоновка токарного верстату, а також розроблена коробка швидкостей і пристосування. Конструкторсько-технологічні розробки супроводжуються техніко-економічним обґрунтування інженерних рішень та комп’ютерними розрахунками. В дипломній роботі розроблені необхідні заходи з охорони праці, безпеки життєдіяльності та екології.
The Master Diploma Paper deals with investigation results of power factors taking place in multi-edge turning following with guarantied continuous metal chip breaking. The research was conducted according to the double-edge machining example. The investigation goal lies in machining accuracy and productivity increasing when such multi-edge accessories using. In this way the main kinds classification of continuous chip breaking as well as the power factor characteristics in the process of multi-edge turning were developed. The comparing estimation of cutting forces axial components changing was performed according to the cases of multi-edge and traditional machining exemplifying the double-edge accessories. The constructive schemes of guarantied continuous metal chip breaking devices using double-edge accessories were developed. Taking into account the technological calculations and shape forming diagrams the base design structure of the engine lathe was determined and in this way the designs of the speed box and corresponding accessories were developed. The design and technological work is followed with the technical and economic discussion of engineering decisions and IT calculations. The diploma paper also deals with development of the necessary labor protection and life safety measures as well as decisions meeting the ecology requirements.
Вступ; Перший розділ "АНАЛІТИЧНИЙ"; Другий розділ "ОПТИМІЗАЦІЯ СХЕМ ФОРМОУТВОРЕННЯ НА ПРОЕКТОВАНОМУ ВЕРСТАТІ І ОПТИМІЗАЦІЯ ЙОГО КОМПОНУВАЛЬНОЇ СХЕМИ ";Третій розділ " ВИБІР ТА ОБГРУНТУВАННЯ ВИХІДНИХ ДАНИХ НА РОЗРОБКУ ВЕРСТАТНОГО ОБЛАДНАННЯ " ;Четвертий розділ "ПРОЕКТУВАННЯ КОНСТРУКЦІЇ ВЕРСТАНОГО ОБЛАДНАННЯ"; П'ятий розділ "НАУКОВО-ДОСЛІДНИЙ" ;Шостий розділ "СПЕЦІАЛЬНИЙ"; Сьомий розділ "Техніко-економічне обґрунтування"; Восьмий розділ "ОХОРОНА ПРАЦІ" ; Дев’ятий розділ "БЕЗПЕКА В НАДЗВИЧАЙНИХ СИТУАЦІЯХ"; Десятий розділ " ЕКОЛОГІЯ" ; Висновки; Перелік посилань; Додатки.
Silva, Márcio Aurélio da. "Investigação experimental da formação do cavaco na usinagem do aço ABNT 1045 e do ferro fundido nodular." Universidade Federal de Uberlândia, 2008. https://repositorio.ufu.br/handle/123456789/14813.
Повний текст джерелаThe chip formation is influenced by several cut parameters which also affect the forces, tensions, powers and temperatures generated during the machining process. Although they have been studied for more than 100 years, still today, the involved mechanisms of deformation are not totally know, due to the fact that the chip formation involves high temperatures and high levels of deformation. This research aims at studying the basic process of chip formation, as well as the influence of the main cut parameters such as cutting speed, feed rate, cutting fluid, tool coating and machined material, besides determining the force of residual cut for ABNT 1045 steel. The inquiry was based on the classification of the chips concerning their type and form, thicknesses values, shear angles, stresses degree and in the monitoring of the cutting forces. Micrographs and measurement of the chips microhardness were made in order to achieve a detailed structural analysis. The results found have shown that the parameters and analyzed conditions really influenced the formation of the chips, being the feed rate more significant than the cutting speed. The tool coating and the cutting fluid had a great influence on the chip formation as well as on the cutting forces during the machining of ABNT 1045 steel and nodular casting iron. The residual cutting force for the ABNT 1045 steel varied between 45 N and 52N.
A formação do cavaco é influenciada por vários parâmetros de corte que afetam também as forças, tensões, potências e temperaturas geradas durante a usinagem. Apesar de ser estudado a mais de 100 anos, ainda hoje os mecanismos de deformação envolvidos não são totalmente conhecidos. Isto se deve ao fato da formação do cavaco envolver grandes temperaturas e altíssimas taxas de deformação. Este trabalho pretende estudar o processo básico de formação do cavaco bem como a influência dos principais parâmetros de corte, tais como velocidade de corte, avanço, fluído de corte , revestimento da ferramenta e material usinado, além de determinar a força de corte residual para o aço ABNT 1045. A investigação foi baseada na classificação dos cavacos quanto ao seu tipo e forma, valores das espessuras, dos ângulos de cisalhamento, grau de recalque e no monitoramento das forças de corte. Foram feitas micrografias e medição da microdureza dos cavacos para uma análise estrutural mais detalhada. Os resultados encontrados através dos experimentos mostraram que os parâmetros e condições analisadas realmente influenciam na formação dos cavacos, sendo que o avanço foi mais significativo que a velocidade. O revestimento e o fluído tiveram grande influência tanto na formação do cavaco como nas forças de corte durante a usinagem do aço ABNT 1045 e do ferro fundido nodular. A força de corte residual para o aço ABNT 1045 variou entre 45 N e 52N.
Mestre em Engenharia Mecânica
Erkers, Louise. "Chemical Interactions between tool and Aluminium alloys in metal cutting." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291358.
Повний текст джерелаAluminium användningen inom fordonsindustrin förväntas öka med 25 % under det närmsta decenniet, främst på grund av elektrifiering men också för att för att minska bränsleförbrukning. Målet med detta examensarbete är till att öka förståelsen för de kemiska interaktionerna mellan aluminiumlegeringar och typiska verktygssystem vid metallskärning, framförallt vid bearbetning av aluminiumlegeringar innehållande kisel med ett TiN-belagt PCD-verktyg och icke-belagda verktyg. Detta gjordes genom prediktiva FEM-simuleringar av temperatur, med hjälp av mjukvaran AdvantEdge. Parallellt med detta skapades databaser för simulering av den kemiska interaktionen mellan skär och bearbetningsmaterial i programvaran Thermo-Calc. De termodynamiska data och beskrivningarna av de termodynamiska system som används var bedömda av andra författare men kritiskt granskade för användning i detta arbete. Resultaten av FEM-simuleringarna gav den beräknade temperaturen för bearbetning av aluminium med PCD ligger någonstans mellan 60-80 % av smälttemperaturen för Al7wt % Si-legering. Beräkningarna av den kemiska interaktionen resulterar i sin tur i att flera hårda utskiljningar kan fastna på eller transformera på ytan mellan arbetsstycket och verktyget, till exempel SiC, Al4C3och diamant från verktyget. Resultaten från detta arbete visar att det går att förutsäga fasomvandlingar mellan skär och arbetsstycket, samt att detta kan användas som indata för skärförslitning under utvecklingen av verktygslösningar.
Ladonne, Mathieu. "Modélisation du procédé de perçage assisté par vibrations forcées : prise en compte de l’environnement Pièce-Outil-Machine." Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0006.
Повний текст джерелаVibrations assisted drilling is a process which ensures chip shape control in order to increase reliability during drilling operations. The adding of axial oscillation, controlled with amplitude and frequency, introduce two new parameters which must determinate according to the conventional parameters (feed and speed rotation). The optimal setting of vibrations assisted drilling is not obvious. To provide an optimization-tool of the process, a new model which take into account the “Tool-Workpiece-Machine” environment, is proposed. Drill geometry, Tool-Workpiece interactions and dynamic behavior of the Machine are incorporated in the model. Tis specificity allows adjusting behavior of the process with the case of application. An identification methodology is presented to characterize the environment. Simulation’s results and experimental results are compared to validate the model. This model thus allows predicting process behavior in order to optimize the operational parameters
Vostřel, Josef. "Technologické, ekonomické a ekologické aspekty obrábění za sucha." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228551.
Повний текст джерелаIrshad, 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.
Повний текст джерелаBarbosa, Patrícia Alves. "Estudo do comportamento mecânico na usinagem de aços inoxidáveis." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-12122014-153825/.
Повний текст джерелаMachining is characterized by large amount of located plastic strain on material due to chip formation, so that there is a link between strain process, strain hardening, and heat softening, thus generating shear bands. Understanding these shear zones becomes important because it contains information that can be applied to machining technique improvements related to process optimizing, and the materials and tools innovations. In this context, stainless steels are regarded as poor machinability materials, due to high work hardening and low thermal conductivity; however, their segmented chip morphology is helpful for facilitating the post-process chip formation researches. Therefore, the aim was to approach machining from the viewpoint of the mechanical behavior science by comparing three stainless steels grades with dissimilar crystalline structures and microstructures during cutting. Strain, strain rate, stress, strain hardening, and primary shear plane temperature were the output variables analyzed. These output variables were determined from cutting forces monitoring and chip characterization (morphology and microstructure) in semiorthogonal turning tests. The results showed the stainless steels machining behavior was different depending on the lattice structure, which is responsible for preferential slipping planes, contributing to amount of strain and reducing the shear stress. Thermal conductivity and hardness were also strong indicators of stainless steels adiabatic shear susceptibility by continuous or segmented chip formation. The stress and strain response of austenitic and duplex stainless steel grades were similar compared to martensitic grade. Strain-induced martensite formation was not evidenced in austenitic stainless steel machining. Empirical models of strain, strain rate, stress, strain hardening and primary shear plane temperature as a function of cutting conditions were obtained by means of the central composite design.
Hayajneh, Mohammed. "A generalized approach for mechanics of chip formation in steady-state and dynamic orthogonal metal cutting using a new model of shear zone with parallel boundaries and its validation to cutting-forces prediction in self-piloting machining." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0005/NQ39626.pdf.
Повний текст джерелаNeumann, Ondřej. "Konstrukce multifunkčního obráběcího centra." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230950.
Повний текст джерелаOndrášek, Dušan. "Studie ekonomiky technologie obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228041.
Повний текст джерелаAtlati, Samir. "Développement d'une nouvelle approche hybride pour la modélisation des échanges thermiques à l'interface outil-copeau : application à l'usinage de l'alliage d'aluminium aéronautique AA2024-T351." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0200/document.
Повний текст джерелаThis PhD. thesis is realised in the framework of an international cooperation between the University of Lorraine (France) and the University of Oujda (Morocco). The work done concerns the modelling of machining process by material removal. Two important aspects of machining have been investigated: the chip formation process and the heat exchange at the tool-chip interface. In the first part of the thesis, a FE modelling of the cutting process has been established. Chips segmentation have been particularly analysed using à new parameter (Segmentation Intensity Ratio) allowing the quantification of the phenomenon. A correlation has been established between the cutting force reduction and the chip segmentation intensity. The second part of the thesis has been devoted to the study of heat exchange at the tool-chip interface, among other phenomena that contribute to the tool wear. One important point of the study is the establishment of a hybrid identification procedure (analytical/numerical) to estimate the heat flux transmitted into the cutting tool, and identification of the heat partition coefficient at the contact interface for each cutting speed. With identified values of the heat partition coefficient obtained by varying the cutting speed, a heat exchange multi-branch law has been proposed and parameters of this law have been identified. This law corresponds firstly to the evolution of the heat partition coefficient as a function of the cutting speed. Thereafter, it was defined in term of the relative sliding velocity at the tool-chip contact interface, in order to implement it in a FE code. The user interface VUINTER of Abaqus/Explicit has been used to implement the proposed law, to fully control the mechanical and thermal contact. It is henceforth possible to implement with this user interface any thermomechanical contact (friction, heat partition coefficient, etc.). The implementation via the user subroutine VUINTER was validated first on adequate tests, then on machining. The obtained results for heat fluxes with this new procedure are in good agreement with experimental measurements for the tool-workmaterial couple considered: AA2024-T351/WC-Co
Aytekin, Kasim. "Characterization of machinability in lead-free brass alloys." Thesis, KTH, Materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240107.
Повний текст джерелаRecent legislation has put focus on the toxic nature of lead as an alloying element in brass products. Watersupply systems are of biggest concern where suspected lead leakages from brass products are threatening human health. A comprehensive study has been conducted in order to characterize the machinability of lead-free brass alloys to provide the industry with necessary information to assist a replacement of the leaded alternatives. The characterization has focused on two particular machining processes, namely turning and drilling and has been based on cutting force generation and chip formation. While the turning tests aimed to characterize the machinability by comparing two lead-free alloys (CW511L and AquaNordic®) with a leaded alloy (CW625N), drilling tests aimed to characterize machinability of the lead-free AquaNordic® alloy particularly, with the main focus put on the impact of tool geometry on machinability. The results have shown that significantly higher cutting forces are generated during turning of lead-free alloys as compared to the leaded. There was, however, no significant difference between the two lead-free alloys regarding cutting forces while chip formation is improved for AquaNordic®. Drilling tests have shown that the machinability of the lead-free AquaNordic® alloy can be improved by increasing the tool rake angle and decreasing tool diameter. Based on the results from this thesis work, it has been concluded that the machinability of lead-free brass alloys is sufficiently good to be able to be adopted by the industry. However, improvement is necessary inorder to fulfill the requirement needed to replace the leaded alternatives.
Zenia, Sofiane. "Modélisation numérique de l’usinage des matériaux composites à matrice polymère et fibres longues de carbone." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0126/document.
Повний текст джерелаThe machining of composite materials is often necessary for material removal operations by cutting tools such as drilling. These operations can generate a lot of damage in the machined workpiece (fiber fracture, matrix craking, intralaminar and interlaminar delamination and thermal degradation of the matrix), which can cause a decrease of mechanical performance of the structure. The PhD thesis objective is to set up a reliable accurate model to analyze the machining of CFRP composites and to predict the different damage modes induced by the cutting tool. This model is based on a mesomechanical constitutive law combining the stiffness degradation concept into the material behavior, the plasticity, the initiation and the evolution of the damage during the machining process. Two 2D and 3D models adopting an explicit scheme were implemented in Abaqus/Explicit analysis code through the user subroutine VUMAT. Furthermore, interlaminar delamination is taken into account using the cohesive elements available in the ABAQUS / Explicit code. This work allowed to realistic numerical simulation of orthogonal cutting and drilling operations of CFRP composites in terms of chip formation process, cutting forces prediction and induced damage. These studies have shown that the fiber orientation and the depth of cut were the most influential parameters in orthogonal cutting while for the drilling process, the feed rate and the tool geometry are the most important parameters
Rodrigues, Alessandro Roger. "Estudo da geometria de arestas de corte aplicadas em usinagem com altas velocidades de corte." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18135/tde-03072005-134755/.
Повний текст джерелаThis thesis presents an experimental study about the specific cutting energy and its relation with cutting parameters, geometrical and tribological characteristics of tools, and workpiece material. Depth of cut, cutting speed, tool nose radius, chip-breaker geometry, tool coating, hardness, microstructure and chemical composition of the workpiece material are some investigated variables. The following workpiece materials were tested: SAE 1213, 1020, 1045, annealed and tempered ASTM H13 steels, and 2024 aluminum alloy. The specific cutting energy values were measured by using a Charpy machine instrumented through piezoelectric dynamometer and incremental optical encoder. Several results could be compared to ones from instrumented CNC lathe and machining center. Tests under HSM condition were carried out in machine-tools. All researched variables have influence over specific cutting energy. The depth of cut rise in 2.3x caused a decrease of specific cutting energy around 21% when machining 2024 aluminum alloy. The elevation of the cutting speed about 70% leaded to reduction of specific cutting energy around 24% when machining SAE 1020 steel. The tool geometry present more influence on specific cutting energy under conventional cutting speed than at high speed cutting. Small variations of tool chip-breaker geometries caused diminution of the specific cutting energy up to 29% for conventional cutting speed, and 14% on average for HSM condition when machining tempered ASTM H13 steel. Various specific cutting energy results obtained from the Charpy test proposed by this work presented a good concordance with equivalent ones provided by scientific literature
Prat, David. "Développement et modélisation de stratégies de fraisage 5 axes de finition -Application à l’usinage de veines fermées." Thesis, Paris, ENSAM, 2014. http://www.theses.fr/2014ENAM0043/document.
Повний текст джерелаThe surface quality of closed fluid veins rotating parts of turbo machines participates in the machine output. It is therefore essential to control the finishing of veins in 5-axis machining with a ball end mill. The titanium alloy Ti6Al4V is one of the materials used and suffers from a poor machinability. The choice of cutting parameters affects the surface quality and the life of the cutter. In order to control the 5-axis milling, characterization methods of cutting are developed for linear and circular paths. Effective diameters and the uncut chip thickness is responsible for several phenomena associated with the cut such as the cutting speed, the speed of evolution of the tool wear, the milling modes and cutting forces. Tests are the link between measures of cutting forces and surface quality and characterization methods of cutting. Once the 5-axis machining with ball end mill characterized, two strategies of finishing closed veins in multiaxis are developed keeping constant the feed speed of the contact and the relative orientation of the tool axis with the normal the local surface. The plunge milling strategy is characterized by a curvature continuous trajectory. The helical milling strategy reveals tangent discontinuities of the trajectory. A method of local smoothing trajectory is then developed to provide a reasonable kinematics and dynamics behavior of machine
Trunda, Jiří. "Technologie výroby frézováním na CNC strojích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228382.
Повний текст джерелаShi, Qi (Alex). "Recycling of titanium alloys from machining chips using equal channel angular pressing." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/19515.
Повний текст джерелаMahmood, Khalid. "An investigation into laser deposition of machining chips and characteristics of the final clad." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/an-investigation-into-laser-deposition-of-machining-chips-and-characteristics-of-the-final-clad(45daf674-4f3f-487b-b25c-14fab168b5d0).html.
Повний текст джерелаSilva, Tayná de Fatima Amorim da. "Estudo da síntese de nanopartículas de NaYF4:Yb:Er a partir de circuito microfluídico projetado no IPEN." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-07022019-161716/.
Повний текст джерелаThis work presents the synthesis of NaYF4 nanoparticles (NPs), doped with rare earth ions, using microfluidic systems designed and fabricated at IPEN through Crystal Growth Lab and Materials Laser Processing Lab partnership. The aim of this work was the study of different microfluidic chips laser machined for use in fluoride NPs synthesis. The compound NaYF4:Yb3+:Er3+ (Yb 10 mole%; Er 0.5 mole %) was chosen to test the fabricated microfluidic chips aiming the production of NPs with hexagonal structure with defined dimensions. Synthesis experiments by co-precipitation method of this material without any surfactant were performed to compare with microfluidics synthesis. By this method spherical particles, were obtained with the cubic NaYF4 crystalline structure. Three different chips were designed and fabricated, using a femtosecond laser to machine BK7 optical glass substrate. The synthesis experiments with these chips resulted in NaYF4:Yb3+:Er3+ NPs with both cubic and hexagonal crystalline structure, in different proportions, depending of precursors flux rates, temperature and resident time. The obtained materials of all experiments were characterized by X-ray diffraction and Rietveld analysis, to define crystalline structures parameters; transmission microscopy to define shape and size of NPs and scanning electron microscopy to characterize the chips micro channels machined by laser. The best results were observed for chips with channels of 400-600μm, in view of the obstruction decrease in the chips. The NPs obtained with microfluidics presented sizes from 5nm up to 200nm and hexagonal and cubic crystallographic structures. Cubic single phase NPs were obtained, but the same did not happened with the NaYF4 hexagonal phase. The present study allowed establishing many different parameters for NaYF4 NPs synthesis through microfluidics and concerning fabrication, assembly and experimental use of microfluidic chips, however, additional experiments will be necessary to obtain the fluoride NPs with controlled size and shape.
YANG, MENG-YAO, and 楊孟瑤. "Investigation of Ideal Machining Condition Considering the Chip Geometry." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/57172342843354129034.
Повний текст джерела國立中興大學
機械工程學系
86
In this paper, the variations of cutting force, surface roughness and chip formiddle-carbon steel during turn machining were investigated.A throw-away toolwas used. The cutting force and surface roughness were measured using tridirectional dynamometer and surface profilemeter, respectively. The chips are collected and examined. The relationship between cutting force and surface roughness versus the cutting condition can be managed through variation of cutting parameters during the machining process. The primary physical parameters governing the cutting process are (1)cutting speed(2)feed rate and (3)depth of cut. The experimental results show that, with increasing cutting speed, continuouschip production occurs. With increasing feed rate, the chip production rate is reduced. When cutting speed and feed rate are changed, the shape of the chipchanges. Depth of cut is not important to the shape of the chip. It was also found that when continuous chips occurs, the cutting force is lower and the machined surface becomes smooth. With higher cutting force and poor surface roughness, the chip rate is reduced. In turning, the production of continuous chips indicates a lower cutting force and a smooth finished surface. Keywords: turning,chip,cutting force,roughness
Zhang, Yuegang. "Development of chip size monitoring system in deep-hole machining." Thesis, 2002. http://spectrum.library.concordia.ca/1865/1/MQ72925.pdf.
Повний текст джерелаSyed, Kareem. "Finite element simulation of chip segmentation in machining a Ti 6A1-4V alloy." 2004. http://digital.library.okstate.edu/etd/umi-okstate-1107.pdf.
Повний текст джерелаQi, Hong Sheng, and B. Mills. "Modelling of the dynamic tool-chip interface in metal cutting." 2003. http://hdl.handle.net/10454/4081.
Повний текст джерелаThe formation of tribo-layers during machining is very common phenomena, especially when machining `free machining¿ steels. Several kinds of tribo-layers formed in metal cutting processes have been reported, layers of inclusions from the workpiece, oxide layers due to chemical reaction, plastic deformation layers, material transfer layers (MTLs) or built-up layers (BULs). A new tool¿chip contact model is proposed to explain the tribo-layer phenomena, which considers the nature of the shear strain rate distribution in the secondary deformation zone. A shear strain rate distribution in this zone having a shape similar to that found in the preliminary zone is proposed. A cutting interface (CI) is defined and this interface is at different location to the material boundary of tool and chip (MBTC). This difference is a key factor in the formation of the tribo-layer in the secondary deformation zone. This model can be used in improving tool wear prediction and the estimation of tool life.