超高强钢板U形件热冲压回弹研究  

Study on Springback of Hot Stamping of Ultra High Strength Steel Plate U-shape Part

作　　者：吴斌[1] 曹志福[2] 

机构地区：[1]无锡职业技术学院机械技术学院,江苏无锡214121 [2]江苏大学机械工程学院,江苏镇江212013

出　　处：《热加工工艺》2016年第11期140-143,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51165021)

摘　　要：建立了U形件热冲压有限元模型,探究了板料加热温度、模具间隙和保压淬火时间对热冲压制件温度场及回弹的影响,研究了残余应力与回弹的关系。结果表明,随着坯料温度的上升成形件回弹量不断减小,且在700℃左右回弹完全消失;模具间隙对回弹的影响较为复杂且无明显规律,随着保压时间的增加,回弹量先减小后几乎保持不变,最佳保压时间为5~8 min;残余应力是产生回弹的主要原因,残余应力形成的力矩越小回弹也越小。The finite element model of U-shape part was established. The influences of sheet heating temperature, die clearance and the holding pressure and quenching time on the springback and hot stamping temperature field were studied.The relationship between residual stress and the springback was also studied. The results show that the springback of forming part decreases with the increasing of blank temperature, and the springback disappears completely at about 700℃.The effect of die clearance on springback is complex, and there is no obvious regularity. With the increase of the pressure holding time,the springback decreases first and then remaines almost unchanged. The optimal pressure holding time is 5-8 min. Residual stress is the main cause of the springback. The smaller torque formed residual stress is, the smaller springback is.

关 键 词：超高强度钢板 热成形 回弹 残余应力 

分 类 号：TG38[金属学及工艺—金属压力加工] TG142.41[一般工业技术—材料科学与工程]