Transactions of Materials and Heat Treatment

Title：Optimization of stamping process for QP980 steel rear side member

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ClassificationCode：TP386

year,vol(issue):pagenumber：2020,45(4):62-69

Abstract：

For the problem of edge cracking in the flanging process of QP980 steel rear side member part in a automobile，a whole process simulation of original scheme was performed by AutoForm software to analyze the cracking reason. Then，Five process optimization schemes were put forward to solve the cracking problem，and the AutoForm software was used to simulate and evaluate the optimization schemes. Besides，The principle analysis of adding an angle cutting die, changing the burr direction,and alleviating the cracking problem was carried out. The results show that severe edge thinning leads to cracking of parts，and conventional pre-forming scheme has limited effect on relieving the edge cracking of ultra-high strength steel.Effective solutions to such problems include two types. First，optimizing the product boundary and reducing the material thinning rate in edge area. Second，changing the strain state of the edge to the in-plane strain state and improving the anti-thinning ability of material. Besides，Changing the direction of burrs can alleviate the problem of edge cracking for parts. Through the study of this problem，the main factors and the solutions of edge cracking in flanging of parts are summed up，it is used to guide the design of subsequent parts and stable production.

Funds：

国家重点研发计划项目（2017YFB0304403）

赵广涛（1986-），男，硕士，工程师 E-mail：zhaoguangtao@baosteel.com

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