Tesis sobre el tema "Machining finishing"
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Qu, Xiuzhi. "An integrated approach to finish machining of RP-produced parts /". View online ; access limited to URI, 2003. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/dlnow/3112126.
Texto completoDHULL, SACHIN. "INVESTIGATION OF HYBRID ELECTROCHEMICAL AND MAGNETIC FIELD ASSISTED ABRASIVE FLOW FINISHING PROCESS". Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18780.
Texto completoVenkatachalam, Sivaramakrishnan. "Predictive Modeling for Ductile Machining of Brittle Materials". Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19774.
Texto completo森, 敏彦, Toshihiko MORI, 健治 広田, Kenji HIROTA, 進幸 千田, Shinkoh SENDA, 義人 川嶋 y Yoshihito KAWASHIMA. "磁気研磨機構に関する力学的考察". 日本機械学会, 2002. http://hdl.handle.net/2237/9029.
Texto completoGilmore, Rhys. "An Evaluation of Ultrasonic Shot Peening and Abrasive Flow Machining As Surface Finishing Processes for Selective Laser Melted 316L". DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1935.
Texto completoCosta, Ronaldo Ferreira da. "Efeitos dos parâmetros de usinagem na formação da camada branca em torneamento duro nos aços-rolamento (DIN 100 Cr6)". Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-19072007-163542/.
Texto completoThis work deals with the microstructural changes in the surface of steels machined by hard turning. A non-acceptable microstructure, called White Layer - WL, is usually found in the hard turned surface. The presence of the white layer depends on hard turning parameters, especially on the wear of the machining tool and cutting speed. The formation of the white layer was investigated in the present work by hard turning the inferior face of a roller-bearing ring fabricated with DIN 100Cr6 steel quenched and tempered (60 HRC hardness). The depth of the WL was measured by standard metallographic procedures. The mechanical properties (stiffness modulus, E, and Vickers hardness) of the surface layer were measured by intrumented indentation in three samples: one with no WL, and two containing a WL of respectively 7 and 12 mm. According to the literature the depth of the WL increases with the wear of the machining tool. This increased with cutting speed, but reaches saturation. The presentresults confirm an effect of tool advance upon the depth of the WL, such that decreasing the advance leads to an increase in its depth, but an effect of tool wear could not be recognized. The formation of the WL is discussed in the context of its effect on surface roughness.
Aguiar, Marcelo Mendes de. "Análise da influência das condições de corte sobre o fresamento em acabamento de aços endurecidos usando altas velocidades". [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264165.
Texto completoDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica
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Resumo: Normalmente, a utilização de aços ferramenta endurecidos, juntamente com as formas complexas típicas das peças utilizadas na área de moldes e matrizes, oferecem dificuldade na usinagem por fresamento, principalmente nas operações de acabamento que exijam o uso de ferramentas longas. A técnica de fresamento HSM (High Speed Machining - usinagem em altas velocidades, ou ainda High Speed Milling - fresamento em altas velocidades) tem se tornado uma alternativa para realizar este tipo de usinagem, reduzindo, ou às vezes até eliminando operações de eletro-erosão e polimento. Tipicamente, as fresas de pastilhas de metal duro intercambiáveis tem sido usadas em operações de desbaste e semi-acabamento, enquanto nas operações de acabamento ou em usinagem de geometrias que exijam ferramentas com pequenos diâmetros ainda predomina o uso de fresas inteiriças. O objetivo principal deste estudo é avaliar a influência de cinco variáveis de processo de fresamento com alta velocidade de corte, sobre o acabamento da superfície usinada. A influência do desgaste das ferramentas sobre o acabamento superficial, ao longo de 400 minutos de usinagem, também foi avaliado, além de uma comparação entre ferramentas inteiriças de metal duro e ferramentas de pastilha intercambiável montada em corpo de metal duro, a fim de avaliar a viabilidade técnica do uso deste segundo tipo de ferramenta, em substituição às tradicionais fresas inteiriças utilizadas em operações de acabamento. Na maioria dos experimentos realizados, pequenos valores de rugosidade foram mantidos, demonstrando que operações de acabamento em aço ABNT H13 IM com dureza de 50 HRC é possível com vida longa de ferramenta, mesmo utilizando-se valor de 500 m/min para velocidade de corte. Além disto, a análise da influência das variáveis de processo utilizadas neste trabalho mostrou que é possível, sob algumas condições, utilizar tanto ferramentas inteiriças, quanto de pastilha intercambiável montada em corpo de metal duro em operações de acabamento
Abstract: Typically, the use of hardened tool steels, along with complex shapes typical of the parts used in the field of molds and dies, offer difficulty in machining by milling, mainly in finishing operations that demand the use of long tool. The HSM (High Speed Machining or High Speed Milling) has become a possible alternative for making this type of machining, reducing, or sometimes eliminating electric discharge machining and polishing operations. Usually, indexable carbide insert mills has been used for roughing and semi-finishing, while in finishing operations or when the machining geometries that require tools with small diameters the integral tools are used yet. The main objective of this study is to evaluate the influence of five process variables, with high cutting speed, on the finish of the machined surface. The influence of tool wear on surface finish through 400 minutes of milling was also evaluated, as well as a comparison between integral carbide mills and indexable insert mounted at cemented carbide toolholder endmills, in order to evaluate the technical feasibility of using this second type of tool, replacing the traditional integral carbide endmills used in finishing operations. In most experiments, small roughness values were maintained, showing that finishing operations on AISI H13 IM with a hardness of 50 HRC is possible with long tool life, even using the cutting speed of 500 m/min. Furthermore, the analysis of the influence of process variables used in this study showed that is possible, under some conditions, the use either integral carbide tools, or indexable insert mounted at cemented carbide toolholder endmills on finishing operations
Mestrado
Materiais e Processos de Fabricação
Mestre em Engenharia Mecânica
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.
Texto completoChardon, Grégory. "Usinage de moules en matériaux composites, expression des contraintes liées au procédé". Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2011. http://tel.archives-ouvertes.fr/tel-00678330.
Texto completoPavézka, Vladimír. "Analýza dokončovacích způsobů obrábění". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229963.
Texto completoBelhadj, Mohamed. "Fabrication additive par arc électrique : règles méthodes pour l’élaboration de pièces brutes en vue de leur parachèvement par usinage". Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0003.
Texto completoWire Arc Additive Manufacturing is a manufacturing technology that uses metal wire as the raw material and an electric arc as the energy source. The wire is deposited at a predefined rate and fused by the arc, either onto a substrate or onto a pre-existing layer. This research focuses on the use of the Cold Metal Transfer (CMT) process applied to austenitic 316L stainless steel. While this technology is widely and successfully used for repair, the current challenge lies in the mass production of functional parts, requiring the resolution of specific design and manufacturing issues.The first objective of this thesis is to evaluate the impact of process parameters, in particular travel speed and interpass time, on part dimensions, surface quality and machining finish. To accomplish this, a design of experiments was set up, involving the manufacture of multi-layer, multi-bead walls on a substrate mounted on an aluminum support. Next, one face of each fabricated wall was machined to determine the machining depth required to achieve a waviness-free surface, and to analyze the surface roughness and hardness of these areas. Finally, a new overlapping method was developed.The second objective is to use the results obtained to develop methods and rules for moving from 3D design to the production of a final part. These methods rely on an additive manufacturing phase and a machining finishing phase. This process aims to eliminate geometric and surface finish variations inherent to the WAAM process, determine the necessary machining allowance, and incorporate issues related to the primary process.The final objective is to understand the mechanisms behind the generation of residual stresses and deformations induced by the primary process. To achieve this, a thermomechanical modeling of the process was developed, highlighting the influence of Travel speed and interpass time on the thermomechanical behavior
Chuang, Cheng-Ru y 莊政儒. "The Internal Finishing of Rectangular Tubes by Applying Magnetic Abrasive Machining Method". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/04486525467760655589.
Texto completo華梵大學
機電工程研究所
90
A new internal magnetic-abrasive machining process of the 6061-T6 aluminum alloy rectangular tube is developed and investigated. In this study, a new finishing apparatus and auxiliary fixtures are designed and developed to simulate the internal finishing process, the magnetic abrasive particle that the finishing ability abrasive grains (Al2O3) are sintered with a ferromagnetic substance (iron powder) by hot pressed, and, the working parameters and their finishing performances are investigated and reported. The Taguchi-Method is adopted for the experimental plan, magnetic field strength, quantity of magnetic abrasives, particle size of magnetic abrasives, rotating speed of magnetic pole, feed rate, vibration frequency, vibration amplitude and the coolant are to be used as the control parameters, internal surface finishing performances, such as the stock removal, the polishing efficiency, and the surface roughness, are studied and verified experimentally. In the present case, by applying the optimal working conditions, a 19.33mg stock removing and 1.91mg/min optimal polishing efficiency were found, and the surface roughness was improved from Ra 0.52mm、Rz(DIN) 2.8mm to Ra 0.09mm、Rz(DIN) 0.66mm. In this paper, the effects of some major parameters on the surface finishing performances are also clarified experimentally.
Chiu, Chao-Yen y 邱肇彥. "Study of finishing surface of end milling toolpath for three-axis machining center". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/61763450901464115781.
Texto completo國立臺灣大學
機械工程學研究所
99
Surface quality of machined products do not only determines the appearance of the products, but also determines the features of products. Novel three-axis milling CNC machines have advantages of high efficiency, high flexibility, high rigidity and high accuracy. Therefore, improving the efficiency and quality of the surface finishing by using three-axis CNC milling machine is a essential issue. This study will use a three-axis CNC milling machine to research the finishing oblique surface and curved surface. Considering the toolpath stepover, stepdown, height of scallop, spindle speed, cutting speed, feed rate, tool radius, slope gradient, radius of curvature, end mills and ball end mills effect on the machined surface. The experimental results show that feed rate and spindle speed effect surface roughness in the feed direction. The scallop is caused by toolpath and tool radius, and effect surface roughness in cross feed direction. Ball end mills is easier than end mills to get low surface roughness in oblique surface finishing. Furthermore, the surface roughness of oblique in feed direction made by contour toolpath is better than parallel toolpath. For curved surface finishing, using ball end mills with parallel toolpath will produce surface waviness caused by small shape errors of tool. Surface waviness is related to radius of curvature, and can be removed by second processing.
Wang, Hsiang-An y 王祥安. "Finishing process of a micro spherical tungsten electrode in electrochemical micro machining and its application". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/36975833332036735289.
Texto completo國立中央大學
機械工程研究所
100
With the development of micro machining or measurement technology, the demand for micro-spherical tools or probes such as using for micro-hole machining, coordinate measuring machine (CMM) and chip test has been rapidly increasing. Electrochemical micro machining (ECMM) is one of nonconventional micromachining processes; its material removal is an anode electrochemical dissolution process. The anodic electrochemical dissolution occurs when a voltage is applied between anode and cathode placed in electrolyte. This paper demonstrates a finishing process using ECMM (ECMF) to build an accurate and smooth micro-spherical tungsten electrode. A micro tungsten electrode is made by several processes including wire electro-discharge grinding (WEDG), electric discharge machining (EDM) spherical forming, and ECMF. The influence of ECMF parameters on the EDMed surface and tool diameter is presented. The experimental result shows a smooth micro-spherical tungsten electrode can be successfully finished and brightened with suitable ECMF parameters that are a voltage of 16 V, electrolyte concentration of 2 wt% and machining time of 0.5 second. When using this method, not only the micro tungsten electrode has a smooth surface and but also its diameter can be fine-tuned to get the high accuracy via the machining time control. Finally, the electrode is tested to drill a micro hole to compare with the machining performance by using conventional cylindrical electrode.
SINGH, HIMMAT. "OPTIMIZATION OF PROCESS PARAMETERS USING CNT PARTICLE BASED ABRASIVE MEDIA USED FOR FINISHING OF BRASS WORKPIECE BY ABRASIVE FLOW MACHINING". Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14939.
Texto completoLIN, TING-YI y 林庭毅. "Analysis and optimization of machining parameters for the bolt of Inconel 718 nickel-based alloys in the finishing grinding process". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/n8bb27.
Texto completo修平科技大學
精密機械與製造科技碩士班
106
This research presents the finishing grinding process for the surface processing of Bolt of Inconel 718 Nickel base alloy. Feed rate and grinding depth, types of grinding wheels, grinding fluid used as the processing parameters to observe the processing characteristics, such as machined surface and surface texture, chip. Using the response surface method (RSM) to generate second order mathematical module explained the relationship between the processing parameters and quality characteristics. The results show the higher feed rate, lower grinding depth and using grinding fluid to reduce the surface roughness values and to obtain better surface quality. The lower toughness and higher the hardness and grin size of wheel is more suitable for milling Inconel 718 nickel-based alloys, and using the grinding fluid minimizes the surface roughness value. Optimum processing parameters obtain its optimal surface roughness values compared with the initial surface roughness values reduced 62.2%.