Transactions of Materials and Heat Treatment

Title：Mold forging defects analysis and mold optimization on box-shaped lock housing

Authors： Wu Jie Zhan Yanran

Unit： Fuzhou University

KeyWords： box-shaped forgings mold forging folding shrinkage cavity crack

ClassificationCode：TG316.3

year,vol(issue):pagenumber：2020,45(3):1-7

Abstract：

For the cracking problem during the mold forging process of intelligent lock housing, the flow characteristics of metal during the mold forging process were investigated by numerical simulation, and the cause of cracking at the convex platform was found. When the metal flowed into the cavity of convex platform, the flow velocity of metal in the core of convex platform was fast, and the flow velocity of metal around the convex platform was slow due to the friction of mold. Then, the extrusion shrinkage cavity was formed here and further developed into the fold towards the plate thickness, the fold appeared on the surface of forgings after being flattened by the mold, and its shape resembled a crack. According to the simulation results, two modification methods for punching at the convex platform and increasing the slope of the convex platform were proposed to increase the filling resistance at the convex platform and reduce the flow velocity of metal in the center of convex platform. The numerical simulation results show that the shrinkage cavity, fold and crack are effectively prevented by the above two modification methods. In order to simplify the mold, the modification method of increasing the slope for the convex platform is adopted to product the good box-shaped forgings without fold defects.

Funds：

伍杰（1994-），男，硕士研究生 E-mail：623257011@qq.com 通讯作者：詹艳然（1966-），男，博士后，教授，博士生导师 E-mail：zhanyr@fzu.edu.cn

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