基于不同U形弯曲冲压工艺的高强度钢板回弹实验研究  

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

作　　者：聂昕[1] 杨昕宇 牛星辉 何寿新 Nie Xin;Yang Xinyu;Niu Xinghui;He Shouxin(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;Tangshan Branch Company,HBIS Company Limited,Tangshan 063000,China;AISN Innovation Design and Manufacture Company Limited,Liuzhou 545000,China)

机构地区：[1]湖南大学汽车车身先进设计制造国家重点试验室,湖南长沙410082 [2]河钢股份有限公司唐山分公司,河北唐山063000 [3]广西艾盛创制科技有限公司,广西柳州545000

出　　处：《锻压技术》2019年第12期1-10,共10页Forging & Stamping Technology

基　　金：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)

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 HC420 LA, HC420/780 DP 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 HC420 LA steel is much smaller than that of HC420/780 DP 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 HC420/780 DP steel and QP980 steel, and the springback on flange edge increases with the increasing of bending angle.

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[金属学及工艺—金属压力加工]