基于正交试验的高强钢板热冲压成形影响因素研究  

Research on Influence Factors of High Strength Steel Hot Stamping Based on Orthogonal Experiment

作　　者：段磊[1] 乔小燕[1] 门长峰[1] 于强[1] 

机构地区：[1]天津职业技术师范大学天津市高速切削与精密加工重点实验室,天津300222

出　　处：《机床与液压》2013年第17期75-80,共6页Machine Tool & Hydraulics

基　　金：天津市应用基础及前沿技术研究计划(12JCYBJC12600);天津职业技术师范大学科研发展基金(YJS10-06;KJ11-08)

摘　　要：高强钢板热冲压成形工艺参数是影响成形零件质量的关键因素。建立了U形件的热冲压有限元模型,采用热力耦合数值模拟得到了热冲压过程中板料的温度、厚度及应力的分布规律。并在此基础上,利用正交试验,研究了热冲压过程中板料初始温度、模具初始温度、冲压速度、压边力4个工艺参数对U形件成形后的最低温度和最大应力的影响程度。结果表明,板料初始温度的影响最大,随着板料初始温度的下降,U形件成形后的最低温度下降,最大应力值大幅度上升;模具初始温度的变化对U形件成形后的最低温度和最大应力值的变化影响最小;冲压速度的影响较大,随着冲压速度的减小,U形件成形后的最低温度下降,最大应力值上升;压边力的变化不影响板料与模具之间的传热,随着压边力的减小,U形件成形后的最低温度和最大应力值相应减小且变化范围较小。The hot stamping process parameter of high strength steel is the key factor to influence the quality of part. The hot stamping finite element model （FEM） of the U-shape part was established, and the coupled thermo-mechanieal numerical simulation was adopted to obtain the blank temperature, thickness and stress distribution during hot stamping process. Based on this, the orthogo- hal experiment was adopted to study the influence degree of the four process parameters such as the blank initial temperature, the die initial temperature, the stamping speed and the blank holder force to the lowest temperature and the maximum stress of the U-shape during hot stamping. The results show that the influence of the blank initial temperature is largest. Along with the blank initial tempera- ture decreasing, the lowest temperature of the U-shape after stamping will decrease and the greatest stress value will increase substan- tially. The die initial temperature changing has the minimum affect on the lowest temperature and the maximum stress value changing of the U-shape after stamping. The influence of the stamping speed is quite large. Along with the stamping speed decreasing, the lowest temperature of the U-shape after stamping will decrease and the greatest stress value will increase. The blank holder force changing does not influence the heat transfer between the blank and die, Along with the blank holder force decreasing, the lowest temperature and the maximum stress value of the U-shape after stamping will decrease and change lesser in an area.

关 键 词：正交试验 高强钢板 热冲压 U形件 

分 类 号：TG376.2[金属学及工艺—金属压力加工]