Transactions of Materials and Heat Treatment

Title：Numerical simulation and process optimization on valve electric upsetting

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ClassificationCode：TG316

year,vol(issue):pagenumber：2020,45(7):13-21

Abstract：

The finite element model of electric upsetting process for automobile engine valve was established by DEFORM-3D. Then, the electric upsetting process of valve was numerically simulated, and the metal flow rules and the distributions of billet temperature, equivalent strain and grain size during the deformation process were analyzed. The results show that the average grain size of electric upsetting part is large and distributes heterogeneously, the metal flow in the transition section between the high temperature region of head and the cold temperature region of stem varies obviously and its equivalent strain distribution is inhomogeneous. Through response surface method and genetic algorithm optimization, the minimum average grain size of electric upsetting part is about 7.3 μm when the electric upsetting temperature is 1053 ℃, the electric upsetting speed is 1.2 mm·s-1 and the clamping length is 7.25 mm. The valve electric upsetting process and the die forging process before and after optimization were simulated and analyzed. Finally, the maximum grain size of valve forging is reduced from 27.0 to 14.4 μm, and the average grain size is also decreased from 12.1 to 7.76 μm which indicates significant grain refinement effect. Meanwhile, the simulated prediction results are basically consistent with the metallographic experimental observation results of valve forging, and the reasonability and reliability of finite element model and optimization procedure are verified to provide guidance for the practical production of valve forging.

Funds：

淄博市校城融合发展计划项目（2018ZBXC037）

陈磊（1997-），男，硕士研究生 E-mail：gtchenlei@163.com 通讯简介：王宗申（1986-），男，博士，讲师 E-mail：wangzsh@sdut.edu.cn

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