锻压技术

EPS转向导杆冷热锻结合成形工艺

英文标题：Cold and hot forging combined forming process of steering rod in EPS

分类号：TG316

出版年,卷(期):页码：2020,45(6):35-39

摘要：

针对转向导杆蝶形凹槽机加工周期长、费用高，不利于批量生产的问题，采用冷热锻结合的方法来成形带有蝶形凹槽的转向导杆。首先，根据转向导杆零件使用要求及形状特点，初步拟定冷热锻结合成形工艺，并采用有限元数值模拟对该工艺蝶形孔成形的可行性进行评估，发现冷锻反挤蝶形孔时冲头受力过大。经过工艺改进及进一步数值模拟分析发现，在坯料反挤蝶形孔部位钻孔会产生分流空间，可以有效降低冲头受力。采用改进工艺进行试验验证，结果表明蝶形凹槽成形的挤压力较低，可有效延长复合冷挤冲头寿命，成形的导杆锻件蝶形凹槽精度高。最终，确定了可行的带有蝶形凹槽的转向导杆成形工艺为：下料—复合热挤—退火—钻孔—润滑—复合冷挤—成品锻件。

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.

基金项目：

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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