锻压技术

热冲压成形工艺参数对硼钢板帽形件回弹影响分析

英文标题：Effect of hot stamping process parameters on springback of hat-shaped boron steel parts

单位：同济大学吉利汽车研究院

关键词：热冲压回弹马氏体相变帽形件

分类号：TG386

出版年,卷(期):页码：2014,39(3):34-37

摘要：

热冲压技术是指板料在高温成形后进行保压淬火，此过程伴随着温度快速降低，材料屈服强度升高，弹性模量变大，并约在300~400 ℃时，组织开始由奥氏体向马氏体转变，零件应力应变场逐步改变。最终开模时，零件会产生一定回弹。针对这种复杂的过程，探讨了保压时间、板料厚度等热冲压工艺对于帽形件回弹的影响。通过试验测量了不同热冲压工艺下硼钢板帽形件的回弹量。研究表明，保压时间越长，回弹越小，并最终稳定在一定范围，且板料越薄，回弹减小。

Hot stamping is a process that blanks are formed at high temperature with subsequent quenching under pressure. It is accompanied by rapid temperature reduction，significant material yield strength enhancement as well as elastic modulus increase. At 300-400 ℃, the austenite transforms to martensite,meanwhile the stress and strain field change gradually. When the die opens at the end of hot stamping,the workpiece will have some amount of springback. For this complicated process,the influences of holding time and sheet thickness on hat-shaped piece springback were investigated, and the springback of hat-shaped part under different hot stamping processes was measured.The results show that the springback decreases with the increasing of press holding time, and eventually stabilizes in a relative range. The thickness of blank becomes thinner, the amount of springback becomes less.

基金项目：

国家自然科学基金项目(51075307);国家科技支撑计划资助项目(2011BAG03B02)

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