The Experts below are selected from a list of 165633 Experts worldwide ranked by ideXlab platform
Joh Monagha - One of the best experts on this subject based on the ideXlab platform.
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deep Drawing Process analysis and experiment
Journal of Materials Processing Technology, 2003Co-Authors: Mark Colga, Joh MonaghaAbstract:Abstract This paper reports on the initial stages of a combined experimental and finite element analysis (FEA) of a deep Drawing Process. The objective of this research is to determine the most important factors influencing a Drawing Process, utilizing the help of a design of experiments and statistical analysis. The parameters varied include the punch and die radii, the punch velocity, clamping force, friction and draw depth. A deep Drawing rig was designed and built for this purpose. Punches and dies of various geometries were manufactured. From previous FEA work and the experimental work performed to date, it seems that the punch/die radii have the greatest effect on the thickness of the deformed mild steel cups compared to blank-holder force or friction. The smaller is the punch/die radii, the greater is the punch force and shorter is the final draw. It has also been observed from the work to date that the speed of Drawing plays an interesting role, in so far as, the higher is the speed the further is the draw, which is not entirely as expected. The cause of this will be further investigated. If the blank-holder force is not kept within the upper and lower limit of reasonable range it does have a significant effect on depth of draw, with the punch tearing through the bottom of the cup if the force is too high and if too low wrinkling of the flange area occurs. After observing the anisotropic effects of the rolling Process on the sheet material through Drawing it and seeing the extent of earing in the flange, some blanks were annealed for stress relief, then the draw depth was compared to that of the original mild steel blanks.
Seok Kwan Hong - One of the best experts on this subject based on the ideXlab platform.
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fem based optimum design of multi stage deep Drawing Process of molybdenum sheet
Journal of Materials Processing Technology, 2007Co-Authors: H K Kim, Seok Kwan HongAbstract:Abstract Molybdenum, one of the refractory metals, has high heat and electrical conductivity while remaining strong, mechanically, at high, as well as low, temperatures. Therefore, it is a technologically very useful material, especially for high temperature applications. However, due to its very low drawability, a multi-stage Process is necessary to make a deep drawn part from the molybdenum sheet. In this study, a multi-stage circular cup deep Drawing Process for a molybdenum sheet was designed by including ironing, which was effective in increasing drawability. A parametric study by finite element analysis of deep Drawing was conducted to evaluate the effect of die design variables. From parametric study results, the design variables of the multi-stage deep Drawing Process were selected. Then, nonlinear Process optimization, based on finite element simulation, was conducted to obtain the optimum multi-stage deep Drawing Process, using a global, as well as a local, optimum search algorithm.
Hajime Hatano - One of the best experts on this subject based on the ideXlab platform.
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an application of ultrasonic vibration to the deep Drawing Process
Journal of Materials Processing Technology, 1998Co-Authors: Takashi Jimma, Yukio Kasuga, Nobuyoshi Iwaki, Osamu Miyazawa, Eiji Mori, Katsuhiko Ito, Hajime HatanoAbstract:Abstract An experimental apparatus with the blank-holder or die plate vibrated in a radial mode was constructed in order to make the apparatus compact. The application of 20 and 28 kHz oscillation increases the LDR from 2.68 to 3.01, from 2.58 to 2.94 and from 2.38 to 2.77 respectively, in the case of cold rolled steel for deep Drawing, cold rolled steel and 304 stainless steel. greater accuracy and deeper cups can be formed by stopping the oscillation after the maximum punch load rather than applying the oscillation throughout the deep Drawing Process. The radial vibration induces the axial vibration in the blank-holder or die plate and the axial vibration contributes strongly to the rise in the limiting Drawing ratio (LDR) rather than the radial one. When one of the blank-holder and die plates is vibrated, the vibration in anti-phase is induced in the other. This means that both the blank-holder and the die plate should be simultaneously vibrated in anti-phase. Seasoning cracks of drawn cups can be avoided when the vibration is applied to the deep Drawing Process of 304 stainless steel sheets.
Denis Favier - One of the best experts on this subject based on the ideXlab platform.
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Tube Drawing Process Modelling By A Finite Element Analysis
2007Co-Authors: Muriel Palengat, Olivier Guiraud, Christophe Millet, Grégory Chagnon, Denis FavierAbstract:Drawing Process is used in manufacturing thin-walled tubes, while reducing progressively their wall thickness and their inner and outer diameters. In this paper a stainless steel 316LVM is studied with one Drawing Process: hollow sinking. This study gets into different issues including elastoplastic behaviour, thermomechanical coupling, contacts, friction and numerical convergence. Experimental Drawings are realized on a testing bench where forces, dimensional data and temperature are recorded. In a first approach, tensile tests lead us to use an elastoplastic constitutive equation with an isotropic hardening law. In simulations, an axisymetric steady-state thermomechanical model is used. Numerical results are compared with experimental results. Finally, in spite of some defaults, this study shows that finite element modelling is able to foresee accurately the thermomechanical behaviour of a tube during a Drawing Process. A better understanding and modelling of the thermomechanical behaviour of materials will improve the FEM simulation results.
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Tube Drawing Process Modelling By A Finite Element Analysis
2007Co-Authors: Muriel Palengat, Christophe Millet, Grégory Chagnon, Denis FavierAbstract:Drawing Process is used in manufacturing thin-walled tubes, while reducing progressively their wall thickness and their inner and outer diameters. In this paper a stainless steel 316LVM and a cobalt alloy L605 are studied with two Drawing Processes, hollow sinking and plug Drawing. This study gets into different issues including elastoplastic behaviour, contacts, friction and numerical convergence. Experimental Drawings are realized on a testing bench where forces and dimensional data are recorded. In a first approach, tensile tests lead up to apply an elastoplastic constitutive equation with an isotropic hardening law. In simulations, an axisymetric steady-state model, with numeric stabilization if needed, is used. Numerical results are compared with experimental results. Finally, in spite of some defaults, this study shows that finite element modelling is able to foresee accurately the behaviour of a tube during a Drawing Process. A better understanding and modelling of the mechanical behaviour of materials will improve the FEM simulation results.
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Tube Drawing Process Modelling By A Finite Element Analysis
AIP Conference Proceedings, 2007Co-Authors: Muriel Palengat, Christophe Millet, Grégory Chagnon, Denis FavierAbstract:Drawing Process is used in manufacturing thin‐walled tubes, while reducing progressively their wall thickness and their inner and outer diameters. In this paper a stainless steel 316LVM and a cobalt alloy L605 are studied with two Drawing Processes, hollow sinking and plug Drawing. This study gets into different issues including elastoplastic behaviour, contacts, friction and numerical convergence. Experimental Drawings are realized on a testing bench where forces and dimensional data are recorded. In a first approach, tensile tests lead up to apply an elastoplastic constitutive equation with an isotropic hardening law. In simulations, an axisymetric steady‐state model, with numeric stabilization if needed, is used. Numerical results are compared with experimental results. Finally, in spite of some defaults, this study shows that finite element modelling is able to foresee accurately the behaviour of a tube during a Drawing Process. A better understanding and modelling of the mechanical behaviour of mater...
Jean-christophe Sangleboeuf - One of the best experts on this subject based on the ideXlab platform.
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Viscosity of As2Se3 Glass During the Fiber Drawing Process
Journal of the American Ceramic Society, 2011Co-Authors: Guang Yang, Tanguy Rouxel, Johann Troles, Bruno Bureau, Catherine Boussard-plédel, Patrick Houizot, Jean-christophe SangleboeufAbstract:The viscosity of As2Se3 glass within the hot zone region of the fiber Drawing Process was estimated using the actual temperature distribution and standard continuum mechanics equations for a linear viscous material. The obtained values for the shear viscosity lie between 103 and 106 Pa*s and are in good agreement with those extrapolated from bending and penetration tests at a lower temperature. In our condition, neck-down region is to be found almost independent on the Drawing rate or on the fiber tension.
