挤压工艺制备空心锡合金杆变形行为的Deform有限元模拟

Finite Element Simulation of the Deformation Process of Tin Solder in the Extrusion Cavity Based on DEFORM

基于DEFORM有限元软件对焊锡丝成型过程中的挤压过程进行模拟,研究了挤压过程中的金属流动性以及损伤分布情况,分析了挤压过程中应力、应变的变化趋势与分布情况,并对坯料不同位置在一定挤压条件下的应力-应变情况进行取点分析。结果表明:在分流挤压过程中,坯料与分流桥接触位置发生较大的塑性变形,并产生一定的损伤,进入焊合腔后,由于流动性减弱,而挤压力增大,材料的损伤值也不断累积;在初始变形时分流桥处应力比较大,充型完成后,在挤压口处应力值不断增大,而坯料的应变逐步变得比较均匀;点分析表明圆柱形坯料中心由于受到分流桥的阻挡而应力应变比较大,边缘处应力应变比较小。

Based on DEFORM finite element,the extrusion process of solder wire forming was simulated.The metal fluidity and damage distribution in the extrusion process were studied.The changes of stress and strain in the extrusion process were analyzed,and the point analysis of extrusion stress-strain at different positions was conducted.The results show that in the process of split extrusion,the contact position of the blank and the split bridge undergoes relatively large plastic deformation,and a certain amount of damage occurs.After entering the welding cavity,the fluidity is weakened,and the extrusion force increases,resulting in damage to the material.The value is also accumulating.The stress at the shunt bridge is relatively large during the initial deformation,and after the filling is completed,the stress value at the extrusion port continues to increase,and the strain of the billet gradually becomes more uniform.Point analysis shows that the center of the cylindrical billet is due to be blocked by the shunt bridge.The stress and strain are relatively large,and these at the edge are relatively small.