Finite Element Analysis on the Forward Extrusion of Cylindrical Billet

• Main Authors: Cian-Jhih Liao, 廖虔志
• Other Authors: Jeen Lin Ph.D.
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/2r2xgn

碩士 === 國立臺北科技大學 === 機電整合研究所 === 103 === In this study, cylindrical rods were computer-aided design and forming simulation. As used herein, DEFORM 2D geometry software forging forming simulation, assuming a constant shear friction, cold conditions, positive analyzes of extrusion pressing load required, corresponding to the equivalent stress and equivalent strain and extrusion die dimensions The relationship, and the time required to load and grid optimization, in order to compare the geometry. Relational and dimensional change after load shaping, explore the relationship between the change of size. General industry in the production of axisymmetric cylindrical products, usually using extrusion molding production lines, but extruded out of the product, there are often rebound situation recess. This study investigated the problem using the finite element method to improve. First, this study forward extrusion process simulation. Find material deformation behavior, since the material outlet at different speeds, resulting material has a curved cross-section sag happens. By modifying the stroke pressure, punch stroke, mold speed, in material flow in different circumstances, various geometrical distortions of the material may be, uneven material flow rate is mainly caused by the deformation of the geometry. Finally, as an optimal parametric design for mold R angle, the analysis, the original design material rebound, the situation can be improved to depression. Forming Simulation using elastoplastic implement ways to improve quality caused by time, fast and accurate grasp condition and direction of the extrusion. Contribute to the academic and products produced using reference, the social and economic but also helpful; the other because I study a restricted range, to be expanded to do the follow-up study to explore the extension.