Transactions of Materials and Heat Treatment

Title：Cold and hot forging combined forming process of steering rod in EPS

Authors： Wang Tao Liu Guanghui Sun Hongxing Qiao Yongqin Liu Dan Liu Baixuan Liu Hua

Unit： Zhengzhou Research Institute of Mechanical Engineering Co. Ltd. Xi’an Jiaotong University

KeyWords： steering rod cold and hot forging butterfly-shaped groove punch equivalent stress

ClassificationCode：TG316

year,vol(issue):pagenumber：2020,45(6):35-39

Abstract：

For the problems of long machining cycle and high cost of butterfly-shaped groove in steering rod, which is not conducive to mass production, the steering rod with butterfly-shaped groove was formed by the combination of cold and hot forging. Firstly, according to the application requirements and shape characteristics of steering rod parts, the combined forming process of cold and hot forging was preliminarily proposed, and the feasibility of butterfly-shaped hole forming was evaluated by finite element numerical simulation to find the punch subjected to excessive force during backward extrusion process of butterfly-shaped hole using cold forging. Through process improvement and further numerical simulation analysis, it is found that drilling in the backward extrusion position of butterfly-shaped hole for blank generats diversion space to reduce the punch force effectively. Furthermore, the improved process was verified by test. The results show that the extrusion force during butterfly-shaped groove formation is low enough to prolong the life of compound cold extrusion punch effectively, and the high precision of butterfly-shaped groove in steering rod is obtained. Finally, the feasible forming process of steering rod with butterfly-shaped groove is determined as blanking-compound hot extrusion-annealing-drilling-lubricating-compound cold extrusion-finished forgings.

Funds：

郑州市科技重大专项资金（152PZDZX007）

王涛（1986-），男，硕士，工程师 E-mail：13623815363@163.com 通讯作者：刘华（1962-），男，博士，博士生导师，研究员 E-mail：13903832971@163.com

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