Effect of inner cone punch on metal flow in extrusion process
Effect of inner cone punch on metal flow in extrusion process
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DOI：
10.1007/s00170-008-1806-9
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发表时间：
2009-05
期刊：
影响因子：
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通讯作者：
Feng Li;J. Lin;S. Yuan;Xiao Jing Liu
中科院分区：
文献类型：
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作者：
Feng Li;J. Lin;S. Yuan;Xiao Jing Liu
采用数值模拟和实验相结合的方法，研究了内锥凸模挤压过程中金属流动行为的力学机制。采用特征变量、应力偏量J2的第二不变量和矿脉系数μ对变形区域进行划分。结果表明，内锥凸模挤压时，挤压筒底部没有金属流动界面，死区完全消失。塑性变形区材料的应变类型由三种类型减少为单一的拉伸类型，金属变形和流动的均匀性得到了很大改善。内锥凸模有利于挤压过程的顺利进行和产品质量的提高。
Using numerical simulation and experiment, the mechanical mechanisms of metal flow behavior were investigated in the extrusion process with inner cone punch. The characteristic variables, second invariant of the stress deviatorJ2and the Lode’s coefficientμwere employed to partition the deformation region. It is shown that no metal flow interface occurred at the container bottom in the extrusion with inner cone punch and the dead zone disappeared completely. The strain types of the material in the plastic deformation area decreased from three types into a single type of tension and the homogeneity of metal deformation as well as metal flow was greatly improved. It was also indicated that inner cone punch was beneficial to the extrusion process and the promotion of product quality.