锻压技术

基于不同U形弯曲冲压工艺的高强度钢板回弹实验研究

英文标题：Experimental study on springback of high strength steel sheet based on stamping processes under different U-shaped bending

作者：聂昕杨昕宇牛星辉何寿新

单位：湖南大学河钢股份有限公司广西艾盛创制科技有限公司

关键词：高强度钢帽形件 U形弯曲成形回弹压边力

分类号：TG386.4

出版年,卷(期):页码：2019,44(12):1-10

摘要：

基于自行设计制造的回弹实验模具，针对帽形件进行了大量的实验研究与分析，比较了HC420LA、HC420/780DP和QP980这3种不同性能的高强度钢板在不同U形弯曲成形的冲压工艺及不同成形状态下的回弹规律，为实际生产和设计提供理论指导。结果表明：任一冲压工艺下，HC420LA钢的回弹都远小于HC420/780DP钢与QP980钢；帽形件侧壁回弹在自由弯曲成形工艺下最小，法兰边回弹在中间预压料弯曲成形工艺下最小，而带压边力弯曲工艺下的回弹始终最大；随料厚的增加，3种高强度钢板的回弹不断减小，但料厚为1.4 mm 的QP980钢进行中间预压料弯曲成形时，回弹呈反向增大的趋势；3种高强钢板的回弹随凸凹模间隙的增大而增大，180~280 kN压边力区间对HC420/780DP钢和QP980钢影响较小，而板料法兰边回弹随弯曲角度的增大而增大。

For hat-shaped parts, a lot of experimental study and analysis were conducted by a self-designed and manufactured die for springback experiments, and the springback laws of three different properties of high strength steel sheet such as HC420LA, HC420/780DP and QP980 in stamping processes under different U-shaped bending and in different forming conditions were compared to provide theoretical guidance for actual production and design. The results show that under any stamping process, the springback of HC420LA steel is much smaller than that of HC420/780DP steel and QP980 steel, and the sidewall springback of hat-shaped parts is minimal under the free bending. However, the springback on flange edge is the smallest under the bending with intermediate force, and the springback under the bending with the blank holder force is always the largest. With the increasing of material thickness, the springback of three high-strength steel sheets decreases continuously, however, when the QP980 steel with the thickness of 1.4 mm is subjected to bend with intermediate force, the springback tends to increase in the opposite direction. Furthermore, the springback of three high-strength steel sheets increases with the increasing of the gap between punch and die, the blank holder force with 180-280 kN has little effect on the springback of HC420/780DP steel and QP980 steel, and the springback on flange edge increases with the increasing of bending angle.

基金项目：

国家自然基金重点项目（61232014）；广西区科技计划资助项目（1348005-1，14122005-7）；柳州柳东新区科学研究与技术开发计划项目（20170204）；汽车用钢开发与应用技术国家重点实验室2017年度开放课题（201891930854）

聂昕（1982-），男，博士，助理研究员 E-mail：niexinpiero@163.com

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