Bibliographies thématiques / WORKPIECE MATERIAL

Littérature scientifique sur le sujet « WORKPIECE MATERIAL »

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Publié le 11 septembre 2023

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Articles de revues sur le sujet "WORKPIECE MATERIAL"

Sakamoto, Satoshi, Masaya Gemma, Yasuo Kondo, Kenji Yamaguchi, Mitsugu Yamaguchi et Takao Yakou. « Influence of the Characteristics of a Workpiece on the Slicing Characteristics Including Tool Wear ». MATEC Web of Conferences 221 (2018) : 04005. http://dx.doi.org/10.1051/matecconf/201822104005.

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Multi-wire saws with a diamond electrodeposited wire tool are widely used to slice hard and brittle materials. The properties of the materials significantly affect the saw’s performance in terms of slicing quality, efficiency, and accuracy. In this study, the effects of the material properties of workpieces on wire tool performance and tool wear are described. The main conclusions are as follows: the higher the hardness and toughness of the workpiece material, the longer the slicing time and greater the damage to the wire tool. The brittleness of the workpiece adversely affects the thickness variation more than its hardness. In addition, the frequency of chipping mainly depends on the hardness of the workpiece, whereas the chipping size mainly depends on the toughness of the workpiece.

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Luo, Ming, Ding Hua Zhang, Bao Hai Wu et Ming Tang. « Modeling and Analysis Effects of Material Removal on Machining Dynamics in Milling of Thin-Walled Workpiece ». Advanced Materials Research 223 (avril 2011) : 671–78. http://dx.doi.org/10.4028/www.scientific.net/amr.223.671.

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In aerospace industry, thin-walled workpieces are widely used in order to reduce the weight and to fulfill the high demands of their later applications. These workpieces are usually highly sophisticated and difficult to machine according to their geometry and material choice. In this paper, influence of material removal within the thin-walled workpiece machining operation on the dynamic properties of the workpiece and the machining process system is discussed. Aiming at learning about dynamic properties evolution during the machining operation, different milling processes of thin-walled plate are studied. Numerical simulation methods are employed in the study to investigate the dynamic properties evolution and machining stability with the material removal process in the milling process of thin-walled workpiece. The investigation results are expected to be used for designing optimized material removal sequence, which will guarantee highly material removal rate as well as highly machining accuracy of thin-walled workpiece.

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Denkena, Berend, Thilo Grove et Eike Hasselberg. « Workpiece Shape Deviations in Face Milling of Hybrid Structures ». Materials Science Forum 825-826 (juillet 2015) : 336–43. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.336.

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A currently common method to design high-performance workpieces is to combine two or more materials to one compound. This way, workpieces can be composed of the most qualified materials according to local loads.When machining high-performance workpiece compounds (e.g. cylinder crankcases), high quality requirements concerning the accuracy of dimension and shape as well as the surface roughness must be fulfilled. However, machining of workpiece compounds leads to unfavorable changes of the workpiece quality in comparison to machining of the single materials. Significant shape deviations occur when different materials are machined alternately in one cutting operation. This is due to unequal material properties, cutting characteristics, chip formation mechanisms as well as characteristic interactions between the single components.The focus of this research is on the process understanding as well as on the identification of measurable shape deviation indicators that describe the surface finish of hybrid structures. Here, the indicators material height deviation, transition deviation at the material joint, surface roughness deviation as well as surface defects (e.g. scratches) on the surface are presented. The overall aim of this research is to predict the surface finish resulting from face milling an aluminum/cast iron compound or a polyurethane/cast iron compound.

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Rajabinasab, Fereydoon, Vahid Abedini, Mohammadjafar Hadad et Ramezanali Hajighorbani. « Experimental investigation of the effect of tool material on the performance of AISI 4140 steel in the rotary near dry electrical discharge machining ». Proceedings of the Institution of Mechanical Engineers, Part E : Journal of Process Mechanical Engineering 234, n^o 4 (6 mai 2020) : 308–17. http://dx.doi.org/10.1177/0954408920922102.

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This research conducts in three sections. The first section studies the effect of tool materials and gases on rotary workpiece electrical discharge machining. During the experiments, the effects of three kinds of tool materials (Cu, Cu-Cr, and Cu-Sn) and three types of industrial gases (air, argon, and CO2) on the material removal rate, tool wear rate, and workpiece surface roughness are investigated. The second is a comparison between rotary workpiece, rotary tool, and the fixed workpiece by choosing the appropriate tool material and gas in order to observe the effect of workpieces rotation on the process. Finally, another comparison has been done between wet electrical discharge machining and near dry electrical discharge machining of the fixed workpiece in order to study the effect of the dielectric. The results show the copper tool has the best performance compared with other tools. Scanning electron microscopy output shows the Cu-Sn tool creates shallow micro-cracks on the surface. Air and CO2 gases have the higher material removal rate in low current, but argon has better function than other gases in high current. In addition, a rotational speed causes an increase in material removal rate and tool wear rate and surface roughness decrease in near dry electrical discharge machining. The level of tool wear rate has decreased by 14% in the rotary workpiece compared with the rotary tool.

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Chudin, V. N., et V. I. Platonov. « Drawing with Thinning under Viscoplasticity Deformation of the Anisotropic Material ». Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, n^o 2 (145) (juin 2023) : 73–82. http://dx.doi.org/10.18698/0236-3941-2023-2-73-82.

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The paper considers the drawing process with wall thinning of the anisotropic workpieces made of high-strength materials exposed to viscoplasticity deformation. Scientific literature is paying insufficient attention to calculation of the deformation processes of workpieces exposed to viscoplasticity. Relationships are proposed to determine stresses and continuity of the workpiece material during drawing in heating the cylindrical products with a thinned wall. State of hot material viscoplasticity is accepted under the plane deformation scheme. Equilibrium equation, yield condition for anisotropic material and discontinuity kinetics equations were used making it possible to predict strength characteristics and accuracy of the products obtained. Calculations of the drawing process modes for workpieces made of the AMg6 aluminum alloy and of the VT6s titanium alloy were performed. Graphic dependences are demonstrated of alterations in the operation specific force and in the material continuity value on the motion speed of the deforming punch. At the given forming temperatures, the energy continuity equation corresponds to the aluminum alloy, and the deformation equation corresponds to the titanium alloy. Influence of the workpiece mechanical properties anisotropy on the drawing technological conditions was studied. It is shown that force modes and continuity alteration of the deformed material depend on the anisotropy coefficient at a given temperature. This factor is determined by strain strengthening of the workpiece material and softening over time

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Tiffe, Marcel, Dirk Biermann et Andreas Zabel. « Fitting of Constitutive Material Parameters for FE-Based Machining Simulations for Functionally Graded Steel Components ». Key Engineering Materials 611-612 (mai 2014) : 1202–9. http://dx.doi.org/10.4028/www.scientific.net/kem.611-612.1202.

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The composition of different materials and their specific properties like tensile strength and toughness is one way to achieve workpiece characteristics which are tailored to the later application. Another approach is the subsequent local heat treatment of workpieces made of homogeneous materials. However, both ways are costly and go along with several subsequent process steps. Therefore, mono-material workpieces which were manufactured by thermo-mechanical forming processes may provide such tailored properties in the form of functional gradations. Furthermore, the process chain is shortened by the combination of forming and heat treatment, but nevertheless machining processes are still needed for proper workpiece finish. This puts the challenge of varying process conditions due to hardness alterations within a single process step, e.g. turning. In addition to experimental investigations simulative analysis techniques are desired to evaluate mechanical as well as thermal loads on tool and workpiece. In the case of FE-based microscopic chip formation simulations proper material behaviour needs to be determined with respect to material hardness. This paper describes the approach of fitting Johnson-Cook material parameters as a function of workpiece material hardness. In order to achieve realistic stress states within the process zone, this approach considers the yield strength as a linear function of the hardness. It is shown how the hardness influences the cutting conditions and how the Johnson-Cook parameters are identified. Then these parameters are validated in three-dimensional simulations of exterior dry turning by comparison of simulated process forces and chip formation to experimentally achieved ones.

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Han, Bing, Cheng Zu Ren, X. Y. Yang et Guang Chen. « Experiment Study on Deflection of Aluminum Alloy Thin-Wall Workpiece in Milling Process ». Materials Science Forum 697-698 (septembre 2011) : 129–32. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.129.

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The deflection of Aluminum alloy thin-wall workpiece caused by the milling force leads to additional machining errors and reduces machining accuracy. In this paper, a set of experiments of milling thin-wall workpiece were carried out to study the deflection of thin-wall workpiece. The workpieces, with different types of material and different thicknesses, were machined on CNC machining center. The deflections of workpiece were measured by a three-coordinate measuring machine. Effects of Aluminum alloy material and thickness on deflection are discussed based on the experimental data.

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Lee, Seok Won, et Andreas Nestler. « Virtual workpiece : workpiece representation for material removal process ». International Journal of Advanced Manufacturing Technology 58, n^o 5-8 (5 octobre 2011) : 443–63. http://dx.doi.org/10.1007/s00170-011-3431-2.

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Jatti, Vijaykumar S., et T. P. Singh. « Effect of Deep Cryogenic Treatment on Machinability of NiTi Shape Memory Alloys in Electro Discharge Machining ». Applied Mechanics and Materials 592-594 (juillet 2014) : 197–201. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.197.

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NiTi shape memory alloys usually consist of binary alloys of nickel and titanium concentrations near the equiatomic composition. Due to high hardness of NiTi alloys, the traditional machining processes are not able to machine these alloys. Nontraditional processes like electro discharge machining (EDM) ; due to their unique mechanism of material removal are useful alternatives in such case.The overall machining performance of electro discharge machining process depends on the electrical, thermal properties of both tool and workpiece materials. Cryogenic treatment has a history of improving mechanical, electrical, and thermal properties of materials. Recently, very few researchers applied cryogenic cooling and treatment of workpiece and tool in conventional EDM and found notable improvement in machining performance. In this study, NiTi shape memory alloys was subjected to around-185C for cryogenic treatment and the effects of cryogenic treatments on the machiniability of NiTi shape memory alloys workpieces in electro discharge machining have been investigated. The electrical conductivity of workpiece exceptionally improved. Experimental results showed about 19% increase in material removal rate of cryogenic treated workpieces. Variations in tool wear rate was found to be marginal.

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Ivanova, Tatyana N., Aleksandr I. Korshunov, Jozef Peterka, Ivan A. Ratnikov et Peter Pokorny. « The Possibility of Modeling Parts in Production Technology ». Multidisciplinary Aspects of Production Engineering 3, n^o 1 (1 septembre 2020) : 359–73. http://dx.doi.org/10.2478/mape-2020-0031.

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AbstractThe object of the research is a part “Flange half of differential case”, which has complex shape of a housing. The subjects of the research are the processes of selection of analogue material, workpiece production method, and justification of the structural and technological parameters of a part, taking into account 3D-modeling of the structure, deformations, displacements, stresses, and safety factor. The selection of analogue material is connected with suspension of production of open-hearth steel grade Mst.6 GOST 380-50. The objectives of the work include juxtaposition of computer models of deformations, displacements, stresses, safety factors of the part made of different analogue materials; comparison of models according workpiece production methods with consideration of material utilization ratio, structural and technological features of resulting workpieces. For modelling we have chosen the several types of materials. Research on modelling processes was fulfilled by means of software of Kompasv17, Solid Works, Solid works simulation. Volumetric models of parts and workpieces for all studied materials have been created taking into account the deformations, displacements, stresses, and safety factor. There results of modelling of “Flange half of differential case” allowed us to make recommendations for production conditions. These recommendations include the use of steel 45 GOST 1050-2013 as analogue material, hot forging of a workpiece on a horizontal forging machine, creating of design and technological documentation for the manufacture of the part.

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Thèses sur le sujet "WORKPIECE MATERIAL"

Wang, Jun. « Material removal sequence optimization for reducing workpiece deformation during thin-wall machining ». Kyoto University, 2020. http://hdl.handle.net/2433/253274.

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Aiso, Toshiharu. « Workpiece steels protecting cutting tools from wear : A study of the effects of alloying elements on material transfer and coating damage mechanisms ». Doctoral thesis, Uppsala universitet, Tillämpad materialvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-306190.

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The vision of this thesis is to improve the machinability of workpiece steels. Workpiece material frequently transfers to the cutting tools during machining, and the transfer layers then forming on the tools may give both good and bad effects on machining performance and tool life. The objective of this work is to understand the effects of alloying element additions to workpiece steels on material transfer and the roles of the formed transfer layers on friction characteristics and wear of tools. To isolate and study the influence of the individual alloying elements, model steels are specifically designed. These steels include one reference with C as the only alloying element and others alloyed also with single additions or combined additions of 1 mass% Si, Mn, Cr and Al. The experiments are performed using both a sliding test, simulating the material transfer in milling, and a turning test. In a sliding contact, the mode of transfer is strongly dependent on the normal load and sliding speed. Material transfer initiates extremely fast, in less than 0.025 s, and characteristic transfer layers develop during the first few seconds. The different steel compositions result in the formation of different types of oxides in the transfer layers. At the workpiece/tool interface where the conditions involve high temperature, high pressure and low oxygen supply, easily oxidized alloying elements in the steel are preferentially transferred, enriched and form a stable oxide on the tool surface. The degree of enrichment of the alloying elements in the oxides is strongly related to their tendencies to become oxidized. The difference in melting temperature of the oxides, and thus the tendency to soften during sliding, explains the difference in the resulting friction coefficient. The widest differences in friction coefficients are found between the Si and Al additions. A Si containing oxide shows the lowest friction and an Al containing oxide the highest. The damage mechanism of coated tools is chiefly influenced by the form and shear strength of the transferred material. Absence of transfer layer or non-continuous transferred material leads to continuous wear of the coating. Contrastingly, continuous transfer layers protect it from wear. However, transfer layers with very high shear strength result in high friction heat and a large amount of steel transfer. This leads to rapid coating cracking or adhesive wear.

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Kaminise, Almir Kazuo. « Estudo da influência do material do porta-ferramenta sobre temperaturas de usinagem no torneamento ». Universidade Federal de Uberlândia, 2012. https://repositorio.ufu.br/handle/123456789/14725.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The main objective of this work is the experimental investigation of the effect that the material of the toolholder has on the temperature at tool-chip interface and on the surface temperatures of the cutting tool and toolholder. The study was conducted in dry turning of gray iron with uncoated cemented carbide inserts, using the same cutting parameters. Five toolholders had been confectioned in materials having different thermal conductivity, these being: copper, brass, aluminum, stainless steel and titanium alloy. The toolholders are identical and have the constructive aspects obtained from a commercial toolholder for turning that material. The temperature at the tool-chip interface was measured using the toolworkpiece thermocouple method and the surface temperatures in the tools and the toolholders, by conventional type T thermocouples. The system was modified in order to develop an experimental procedure for the physical compensating of the secondary and parasites thermoelectric signals (emf). Also, modifications was carried out in a conventional tailstock for use in driving the emf signal between the workpiece and a stationary conductor, but without significantly altering the stiffness of the system. The tailstock was electric insulated and a mercury bearing was mounted inside it and their internal connections were turned in reference junctions at room temperature because on otherwise it could act as secondary junctions. The calibration of the tool-workpiece thermocouple was developed in the same experimental apparatus using the modifications implemented in this system. Besides the results obtained with the investigation of the effects of the toolholder material on the surface temperatures of the tool and the tool holder and on the tool-chip interface temperature, this research also presents contributions to the use and performance of the tool-workpiece thermocouple method.
O objetivo principal deste trabalho é a investigação experimental do efeito que o material do porta-ferramenta exerce sobre a temperatura na interface ferramenta/cavaco e sobre as temperaturas superficiais da ferramenta de corte e do próprio porta-ferramenta. O estudo foi desenvolvido com a operação de torneamento cilíndrico externo de ferro fundido cinzento, a seco, com insertos de metal duro, em parâmetros de corte fixos. Cinco portas-ferramentas foram confeccionados em materiais com condutividades térmicas diferentes, sendo esses: cobre, latão, alumínio, aço inoxidável e liga de titânio. Os portas-ferramentas são geometricamente idênticos e têm as características construtivas de um porta-ferramenta comercial próprio ao torneamento daquele material. Mediu-se a temperatura na interface ferramenta/cavaco usando o método do termopar ferramenta-peça e as temperaturas superficiais na ferramenta e nos suportes, por meio de termopares convencionais do tipo T. O sistema termopar ferramenta-peça foi modificado no sentido de se desenvolver um procedimento experimental para a compensação física de forças eletromotrizes secundárias e parasitas. Destaca-se a execução de modificações em uma contra ponta rotativa convencional para o seu uso na condução do sinal da força eletromotriz entre a peça e um condutor estacionário sem, contudo, alterar significativamente a sua rigidez na fixação da peça. Nessas modificações, aplicou-se uma isolação elétrica permanente, implantou-se um mancal de mercúrio no seu interior e promoveu-se mudanças nas suas conexões internas, que poderiam agir como junções secundárias, transformando-as em junções de referência à temperatura ambiente. A calibração do sistema termopar ferramenta-peça foi desenvolvida sobre o próprio aparato experimental usando as modificações implantadas nesse sistema. Os resultados obtidos no trabalho mostram que os materiais usados nos suportes influenciam nas temperaturas superficiais da ferramenta e do porta-ferramenta, porém, que tais materiais não tem efeito significativo sobre as temperaturas da interface ferramenta/cavaco. Além disso, o trabalho apresenta, também, contribuições ao uso e calibração do método do termopar ferramenta-peça.
Doutor em Engenharia Mecânica

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PANWAR, MANSI. « EXPERIMENTAL INVESTIGATION OF HELICAL ABRASIVE FLOW MACHINE SETUP FOR DIFFERENT TYPES OF WORKPIECE MATERIAL ». Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14771.

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Abrasive flow machining (AFM), also known as abrasive flow deburring or extrude honing, is an interior surface finishing process characterized by flowing an abrasive -laden fluid through a work piece. During the study different medias, workpieces and pressure ranges were chosen. These fluids are typically very viscous, having the different plasticizers. AFM smoothens and decreases surfaces roughness, and is specifically used to remove burrs; polish surfaces form radii, and even remove material. These experiments were conducted between aluminium, brass, mild steel at a range of 10, 15, 20Mpa. When an abrasive mixed with a polymer of special rheological properties and forced through a restricting medium, the abrasive and polymer will act as a self-forming tool that precisely removes work piece material and improve the surface finish at those areas restricting to the medium flow. Different relationships between a number of sets of workpiece, media and pressure are obtained using TAGUCHI method and their analysis was performed over ANOVA technique. Styrene butadiene rubber which is the most common natural rubber has given improved outputs among other media. In the % improvement in the roughness came out to be 39.51% and 3.21mg for material removal analysis.

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Wu, P. L., et 吳佩霖. « A Study on the Milling Condition for Maximum Material Removal Rate under Constrant of Workpiece Temperature ». Thesis, 2000. http://ndltd.ncl.edu.tw/handle/89416311210395233375.

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碩士
國立成功大學
機械工程學系
88
The heat generated during metal cutting process will degrade the dimensional accuracy and surface integrity including residual stresses, micro-structural changes and cracks etc. First, the work temperature beneath the surface in an end milling process is analyzed with the moving heat source theory and the results are verified with experiments. In order to investigate the influences of the tools geometry and cutting conditions on the temperature on work surface, the cutting simulation software “AdvantEdge” in combination with Taguchi method is used to identify the significant parameters that affect the surface temperature of AL7075-T6. Further investigation shows how to maximize the metal removal rate under the constrained of maximum surface temperature.

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Livres sur le sujet "WORKPIECE MATERIAL"

Zinn, S., et S. L. Semiatin. Elements of Induction Heating. ASM International, 1988. http://dx.doi.org/10.31399/asm.tb.eihdca.9781627083416.

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Elements of Induction Heating: Design, Control, and Applications discusses the principles of electromagnetic induction and the setup and use of induction heating processes and equipment. The first few chapters cover the theory of induction heating and the factors that must be considered when selecting and configuring components for a given application. As the text explains, the frequency required for efficient heating is determined by the geometry of the coil, the properties, size, and shape of the workpiece, and the need to maintain adequate skin effect. It also depends on proper tuning and load matching, which is explained as well. Subsequent chapters discuss the use of external cooling, temperature sensing, and power-timing devices, the fundamentals of process control, the role of flux concentrators, shields, and susceptors, and the integration of material handling equipment. The book also covers coil design and fabrication and explains how induction heating systems can be tailored for specific applications such as billet and bar heating, surface hardening, pipe welding, tin reflow, powder metal sintering, and brazing, and for curing adhesives and coatings. For information on the print version, ISBN 978-0-87170-308-8, follow this link.

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Chapitres de livres sur le sujet "WORKPIECE MATERIAL"

Ben-Hanan, U., U. Eckert, M. Mende, A. Weiss, R. Wertheim et U. Azaria. « Development of a Pneumatic Clamping System with Position and Force Control Machining ». Dans Lecture Notes in Mechanical Engineering, 184–92. Cham : Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-28839-5_21.

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AbstractPrecision machining plays a vital role in modern, efficient, and sustainable manufacturing. Monitoring and controlling the clamping forces can influence positioning accuracy, workpiece deformation, thus improving the production outcome. The clamping force must be adapted to the cutting forces, workpiece geometry, and material properties to improve accuracy and control workpiece deformation during machining. The best devices available have a repeatability of ±1 µm, however, with limited precision and repeatability when re-clamping the workpiece. This paper presents the newly developed high-precision adaptable clamping system for controlled high-precision positioning and repositioning of a workpiece in the x-y plane with visual pattern recognition, adjustment, and controlled clamping forces. The clamping system is based on a pneumatic clamping chuck with controlled air pressure on a very accurate CNC machine. FEA calculations of thin-walled workpieces are used for designing associated jaws to ensure workpiece holding, limited forces and limited deformations. Once the workpiece has been removed and re-clamped with the defined forces, the vision device identifies the new workpiece position. Force and position data are collected and analyzed for calculating the repositioning movement in the x, y, and theta axes. The difference between the measured position after re-clamping and the reference position is calculated using a specially developed algorithm, yielding the motion commands to the x, y and theta axis. Using the vision system made it possible to identify an accuracy of ±1 µm and a repeatability of ±0.5 µm.

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Pöhlandt, Klaus. « Material and Workpiece after the Forming Process ». Dans Materials Testing for the Metal Forming Industry, 151–73. Berlin, Heidelberg : Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-50241-5_6.

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Chen, Huiqun, et Fenpin Jin. « A Novel Approach for Surface Topography Simulation Considering the Elastic-Plastic Deformation of a Material During a High-precision Grinding Process ». Dans Proceeding of 2021 International Conference on Wireless Communications, Networking and Applications, 1176–93. Singapore : Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2456-9_118.

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AbstractA novel simulation approach for 3D surface topography that considers the elastic-plastic deformation of workpiece material during a high-precision grinding process is presented in this paper. First, according to the kinematics analysis for the abrasive grain during the grinding process, the motion trajectory of the abrasive grain can be calculated. Second, the kinematic interaction between the workpiece and the abrasive grains can be established, which integrates the elastic-plastic deformation effect on the workpiece material with the topography, the simulation results are more realistic, and the simulation precision is much higher. Finally, based on an improved surface applied to the grinding wheel, the surface topography of the workpiece is formed by continuously iterating overall motion trajectories from all active abrasive-grains in the process of high-precision grinding. Both the surface topography and the simulated roughness value of this work are found to agree well with those obtained in the experiment. Based on the novel simulation method in this paper, a brand-new approach to predict the quality of the grinding surface by providing machining parameters, selecting effective machining parameters, and further optimizing parameters for the actual plane grinding process, is provided.

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Lebedev, Vladimir, Tatiana Chumachenko, Nataliya Klymenko, Olga Frolenkova et Serhii Yevtifieiev. « Penetration Depth of the Critical Temperature into the Workpiece Material During Grinding ». Dans Lecture Notes in Mechanical Engineering, 453–62. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77719-7_45.

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Knape, Simon, Michael Königs, Alexander Epple et Christian Brecher. « Increasing Accuracy of Material Removal Simulations by Modeling Workpiece Deformation Due to Clamping Forces ». Dans Advances in Production Research, 72–80. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03451-1_8.

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Wu, Yan, Bo Zhao et Xun Sheng Zhu. « Modeling of Material Removal in Workpiece Lateral Ultrasonic Vibration Grinding of Fine-Crystalline Zirconia Ceramics ». Dans Advances in Machining & ; Manufacturing Technology VIII, 304–8. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-999-7.304.

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Krux, Rainer, Werner Homberg et Matthias Kleiner. « Material Flow Curve Influence on Macroscopic Residual Stresses in the Workpiece Bottom in High-Pressure Sheet Metal Forming ». Dans Materials Science Forum, 173–78. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-414-6.173.

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Tensi, Hans M., B. Liščić et T. Filetin. « Prediction of Hardness Profile in Workpiece Based on Characteristic Cooling Parameters and Material Behaviour During Cooling ». Dans Theory and Technology of Quenching, 390–476. Berlin, Heidelberg : Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-662-01596-4_11.

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Chen, Gaoqiang, Qingyu Shi et Zhili Feng. « On the Material Behavior at Tool/Workpiece Interface During Friction Stir Welding : A CFD Based Numerical Study ». Dans Friction Stir Welding and Processing VIII, 251–58. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093343.ch27.

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Chen, Gaoqiang, Qingyu Shi et Zhili Feng. « On the Material Behavior at Tool/Workpiece Interface During Friction Stir Welding : A CFD Based Numerical Study ». Dans Friction Stir Welding and Processing VIII, 251–58. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48173-9_27.

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Actes de conférences sur le sujet "WORKPIECE MATERIAL"

Donoghue, Joseph P., W. Stamps Howard et Vijay Kumar. « Stable Workpiece Fixturing ». Dans ASME 1994 Design Technical Conferences collocated with the ASME 1994 International Computers in Engineering Conference and Exhibition and the ASME 1994 8th Annual Database Symposium. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/detc1994-0159.

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Abstract In this paper, we present the spatial and planar force-displacement relationships which characterize individual contacts on a fixtured workpiece. The compliance at each contact is modeled and expressions for the changes in contact forces as a function of the rigid body relative motion between the fixture elements and the workpiece are developed for three-dimensional fixtures. Using these relationships, the stable fixturing of planar workpieces is demonstrated for material-removal operations. By example, we first describe how to choose the clamp geometry so the overall movement of the workpiece is minimized and then determine the “best” two-contact clamping arrangement using a quality measure based on the deviation from the nominal part dimensions.

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Rozzi, Jay C., Frank E. Pfefferkorn, Frank P. Incropera et Yung C. Shin. « Experimental Evaluation of the Laser Assisted Machining of Silicon Nitride Ceramics ». Dans ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1034.

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Abstract Laser assisted machining (LAM), in which a workpiece is locally heated by an intense laser source prior to material removal, provides an alternative machining process with the potential to yield higher material removal rates and lower manufacturing costs for difficult-to-machine materials such as structural ceramics. To assess the feasibility of the LAM process, experiments were performed on silicon nitride workpieces for a wide range of operating conditions. Data for cutting forces and surface temperatures indicate that the lower bound of the material removal temperature for avoidance of cutting tool and/or workpiece fracture corresponds to the YSiAlON glass transition temperature (920–970°C). As temperatures near the cutting tool increase to values above the glass transition temperature, the glassy phase softens, facilitating plastic deformation and, correspondingly, the production of semi-continuous or continuous chips. The silicon nitride machined workpiece surface roughness (Ra = 0.39 μm) for LAM at the nominal operating condition was nearly equivalent to a value associated with the grinding of silicon nitride using a diamond wheel (Ra = 0.2 μm). Examination of the machined surfaces and chips reveals no detectable sub-surface cracking or significant changes in microstructure, respectively. Relative to grinding, the most significant advantage of LAM is its ability to achieve much larger material removal rates with high workpiece surface quality and reasonable levels of tool wear.

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ŻYRA, A. « Influence of material properties on near dry-EDM process : The discussion of research for titanium grade 2 and Inconel 625 alloy ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-179.

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Abstract. Dry EDM machining with external workpiece cooling is one of the possible modifications of dry EDM process, which enables to reduce the negative impact of EDM machining on the environment and on the machine tool operator. At the same time, it is possible to obtain relatively good machining accuracy and surface quality. Due to the problems with the effective heat dissipation from the machining gap, the application of dry-EDM is still limited to micromachining. In this paper the comparison and discussion of dry-EDM technological factors for two hard to machine materials: Inconel 625 and Titanium Grade 2 have been presented. The tests were carried out in carbon dioxide as a dielectric supplied to the machining gap through the channel in the workpiece electrode. To improve the process effectivity additional workpiece cooling were also applied, however the presence of fluid in machining area makes the process near dry-EDM. The input machining parameters were pulse time, machining voltage, current amplitude and inlet gas pressure. The main aim of this work was to show the significance of the type of machined material on the material removal rate, and surface layer (i.e. roughness, morphology and microhardness). The results analysis will be discussed considering differences in physical properties of machined materials.

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Krishnamurthy, B. « Influence of mesh in modelling of flow forming process ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-171.

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Abstract. Flow forming is an incremental bulk forming process used to produce tubular components from high-strength alloys. One of the features complicating its modelling is the small contact area of the workpiece with the tools. Taken along with cyclic non-monotonic loading from three rollers deforming the workpiece with complicated kinematics, this demands a very fine mesh and time step throughout the simulation. The typical approach of using a tetrahedral mesh with strain-based remeshing can introduce errors in the results due to the highly localized deformation and can also prolong the computation time. In the present study, in parallel to using tetrahedral mesh with remeshing, two different approaches of hexahedral mesh without any remeshing were also modelled for the workpiece, retaining all the other setup parameters, and the results compared. In both cases, local mesh adaptations were used to ensure a very fine mesh in the zone of contact with the rollers. Results from the simulations clearly showed that the key outputs such as stress state parameters (triaxiality and Lode stress parameters) and plastic strain values were very sensitive to the mesh and remeshing method used and careful consideration is required before employing the outputs for further analysis.

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KERSTING, L. « Control strategy for angular gradations by means of the flow forming process ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-220.

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Abstract. Climate change, rare resources and industrial transformation processes lead to a rising demand of multi-complex lightweight forming parts, especially in aerospace and automotive sectors. In these industries, flow forming is often used to produce cylindrical forming parts by reducing the wall thickness of tubular semifinished parts, e.g. for the production of hydraulic cylinders or gear shafts. The complexity and functionality of flow forming workpieces could be significantly increased by locally graded microstructure and geometry structures. This enables customized complex hardness distributions at wear surfaces or magnetic QR codes for a unique, tamper-proof product identification. The production of those complex, 2D (axial and angular) graded forming parts currently depicts a great challenge for the process and requires new solutions and strategies. Hence, this paper proposes a novel control strategy that includes online measurements from an absolute encoder to determine the angular workpiece position. Workpieces of AISI 304L stainless steel with 2D-graded structures are successfully manufactured using this new strategy and analyzed regarding the possible accuracy and resolution of the gradation. At this point, a dependency of the gradations on the sensor and actuator dynamics, accuracy and geometry could be noted. It is further evaluated how the control strategy could be extended by an observer-based closed-loop property control approach to enhance the accuracy of the suggested strategy.

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FENERCIOĞLU, T. O. « Influence of increased die surface roughness on the product quality in rotary swaging ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-98.

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Abstract. Rotary swaging is an ascendant forming method for manufacturing axisymmetric parts. High production rate with excellent net shape forming is achieved in recent automation developments. However, precise machine design and tailored process developments are necessary to transfer the high impact type forming loads to workpiece efficiently. The failure of this transfer results in high vibrations of the machine structure and poor product quality, due to the impact loads with high frequencies. The centerpiece of the process development to prevent these disruptive effects is to resolve die specifications such as shape and surface properties. In general forming applications, surface roughness of the dies is perceived as a disruptive element for the product quality and only a small amount is provided to settle lubricants. However, for rotary swaging applications, an optimized surface roughness to increase the load transfer between the die and the workpiece without disrupting the final product surface quality is essential. In this study, for a fixed die shape, the relation between the die surface roughness and the product quality is investigated for macro rotary swaging applications. In particular, the effective transfer of the forming forces to the workpiece is analyzed by using finite element analysis within the scope of surface friction. Consequently, a die set with roughened surface conditions is manufactured by using a novel technique. Real process trials are conducted to validate the results of the analysis.

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HERRMANN, P. « Modification of the surface integrity of powder metallurgically produced S390 via deep rolling ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-108.

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Abstract. Fine blanking is an economical process for manufacturing sheet metal workpieces with high sheared surface quality. When machining high-strength steels, material fatigue leads to increased punch wear, which reduces the economic efficiency of the process. This fatigue of the cutting edge and lateral punch surface can be counteracted by mechanical surface treatments. Deep rolling has proved particularly useful for such surface modification, as it allows both: machining of the lateral punch surface and the application of the cutting edge rounding required for fine blanking. For the precise design of the fine blanking punch contour especially the macroscopic deformation of the workpiece is decisive. In this paper, the possibility of specifically modifying the surface integrity of hardened and powder metallurgically produced S390 by means of the incremental surface treatment process deep rolling is investigated. By varying the decisive process parameters rolling pressure, ball diameter and step over distance, their influence on surface integrity is determined. The surface integrity is afterwards characterized by macro hardness, surface topography and residual stress state and microstructural images.

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Arif, U. « Modelling the effect of tool material on material removal rate in electric discharge machining ». Dans Advanced Topics in Mechanics of Materials, Structures and Construction. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902592-46.

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Abstract. Present study aims at modelling the impact of tool materials such as copper, tungsten carbide and brass tool on the electric discharge machining of AISI 202 stainless steel. It is well known that the electrical conductivity of tool material has an influence on the current density passed through interelectrode gap and hence sparking process and MRR are affected accordingly. A finite element model was made using gaussian heat flux equation, spark radius and fraction of heat transferred to workpiece as a function of pulse on time and pulse current, latent heat in specific heat values and thermal conductivity properties. However, for the above reasons, current density used in gaussian heat flux equation was modified and electrical resistivity (which is inverse of electrical conductivity) of tool and workpiece were incorporated in it. This theorized heat flux formulae were then tested with the literature and found to give MRR similar to the literature.

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ROTELLA, G. « On the impact of tool material and lubrication in ball end milling of ceramic foams ». Dans Material Forming. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902479-144.

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Abstract. High porosity materials, such as ceramic foams, can be used for several applications spanning from thermal insulators, biomedical implants, molten metal filters, and others. The general practice is to adjust the shape of those ceramic foams in a pre-sintering stage to obtain complex shapes. This work aims to investigate the workability of ceramic foams in a post-sintering condition as an alternative way to overcome premature product failure during production and inhomogeneous shrinkage during sintering. An experimental campaign of ball end milling of alumina-based ceramic foams in a sintered state was carried out herein. Two different tool materials (aluminum oxide-based, diamond-coated) have been tested using two levels of spindle speed under minimum quantity lubrication (MQL) and flood lubrication regimes. The most important findings are: (i) the influence of lubricant is more pronounced analyzing the tool wear, but it has a smaller effect on surface characteristics of the workpiece, (ii) higher spindle speed improves workpiece surface quality (ii) diamond coated tools are the best available choice in terms of both tool wear and surface quality.

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Spenger, Thomas, Franz Haas, Jonas Pichler, Martin Weinzerl, Stefan J. Eder et Markus Weiß. « RPM-Synchronous Grinding : An Innovative and Efficient Manufacturing Method for the Production of Non-Circular Workpieces ». Dans ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23859.

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Abstract RPM-Synchronous Grinding (RSG) opens up a wide range of applications, as this manufacturing process enables the efficient production of components with a functional macro geometry as well as a functional micro geometry of the surface. Unlike conventional non-circular grinding approaches, the RSG process strategy requires no oscillation of the infeed axis of the grinding spindle generated by coupling the rotation with the workpiece spindle. By using a fixed ratio of grinding wheel and workpiece spindle speed in conjunction with a non-circular grinding wheel geometry, almost all workpiece macro geometries can be produced in a simple plunge grinding process. The topology of the grinding wheel, the kinematic parameters of the dressing and grinding process and the material parameters of the workpiece must be sensibly matched to each other for an advantageous application of the process. Experiments can help to identify relationships, but simulation tools are needed to derive general predictions. Therefore, Molecular Dynamics Simulation (MD) is used to analyze the material removal process. By considering synchronous grinding at this level, the microstructural development of the workpiece and the chip formation process follow directly from atomic interactions, thus yielding elementary relationships to describe grinding. In the presented application, a defined cam geometry for an established steel material is produced using a conventional vitrified grinding wheel in the RSG process. The surface quality and geometric accuracy of the manufactured workpieces are evaluated. A selection of the MD grinding simulation results (workpiece, abrasive, and their interactions) is presented, and their intended application to the grinding process is discussed.

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