Analysis and finite element simulation of bimetallic backward rod extrusion
Analysis and finite element simulation of bimetallic backward rod extrusion
复制标题
双金属反向棒挤压分析及有限元模拟
DOI：
10.7158/m13-019.2014.12.3
复制
发表时间：
2014
影响因子：
1.4
通讯作者：
H. Momeni
中科院分区：
文献类型：
--
作者：
H. Haghighat;H. Momeni
摘要本文采用上界法和有限元法研究了双金属后向棒材锥形凸模的挤压过程。建立了容许速度场，并通过计算内力、剪切力和摩擦力来估算挤压力。利用有限元软件ABAQUS对挤压过程进行了仿真。对两种类型的双金属棒进行了分析和模拟：铝为芯，铜为套（Al-Cu）和铜为芯，铝为套（Cu-Al）。将上界法得到的挤压力与有限元计算结果进行了比较。这一比较表明，上界预测与有限元结果很好地吻合。结果还表明，Cu-Al棒材的挤压力比Al-Cu棒材小，两种双金属棒材中，铝均比铜早离开变形区。最后研究了摩擦系数、面积收缩率、半冲角等不同挤压参数对挤压力的影响，确定了最佳半冲角。
Abstract In this paper, the process of bimetallic backward rod extrusion through a conical punch, by means of upper bound method and finite element method is investigated. An admissible velocity field is developed and then by calculating the internal, shear and frictional powers, the extrusion force is estimated. The extrusion process is also simulated by using the finite element code, ABAQUS. Analysis and simulations are done for two types of bimetallic rods: aluminium as core, copper as sleeve (Al-Cu) and copper as core, aluminium as sleeve (Cu-Al). The extrusion force from the upper bound method is compared with the finite element results. This comparison shows that the upper bound predictions are in good agreement with the finite element results. The results also show that, the extrusion force in the case of Cu-Al rod is smaller than Al-Cu rod and in both types of bimetallic rods, the aluminium leaves the deformation zone sooner than the copper. Finally the effects of various extrusion parameters, such as the friction factor, reduction in area and semi-punch angle upon the extrusion force are investigated and the optimum semi-punch angle is determined.