锻压技术

一种长厚臂叉形接头锻件成形工艺与实验

英文标题：Forming process and experiments for a kind of fork\|shaped joint forgings with long and thick arm

单位：1. 郑州机械研究所有限公司 2. 中国机械科学研究总院集团有限公司 3.宇通重工有限公司 4. 西安交通大学机械工程学院

分类号：TG316

出版年,卷(期):页码：2022,47(6):61-66

摘要：

根据长厚臂叉形接头锻件的形状特点，分析了锻件的成形难度，初步制定了成形工艺为热镦挤复合成形和立式反挤成形，并采用数值模拟研究了各工序成形过程以及冲头成形力。通过后续工艺实验发现，热镦挤复合成形工序成形的锻件在方形上端部分四角处有明显的折叠缺陷，分析认为这是由于实验过程中锻件长时间的热量散失造成金属流动性降低而产生的。对初步拟定的成形工艺进行了改进，改进后的成形工艺为热正挤、热镦方和热反挤，数值模拟分析以及验证实验表明，改进后的成形工艺可行，并且设计了具有导向功能的模具结构，解决了叉形接头锻件壁厚不均的问题。该成形锻件填充饱满、无缺陷，金属流线分布连贯、合理，成形工艺和模具寿命通过了批量生产考核。

According to the shape characteristics of fork\|shaped joint forgings with long and thick arm, the forming difficulty was analyzed. Then, the forming process was preliminarily formulated as hot upsetting\|extrusion compound forming and vertical backward extrusion forming, and the forming process of each procedure and the forming force of punch were studied by numerical simulation. The subsequent process experiments shows that the forgings formed in the hot upsetting\|extrusion compound forming process has obvious folding defect at four corners of square upper end, which is caused by long\|term heat loss of forgings during experiment process resulting in the reduction of metal fluidity. Furthermore, the preliminarily drafted forming process was improved, and the improved forming process was hot forward extrusion, hot upsetting into square and hot backward extrusion. The numerical simulation analysis and verification experiments show that the improved forming process is feasible, and the mold structure with guiding function is designed to solve the problem of uneven wall thickness for fork\|shaped joint forgings. The forgings are full filled and defect\|free, the metal streamline distribution is consistent and reasonable, and the forming process and mold life have passed the mass production assessment.

基金项目：

郑州市科技重大专项资助项目（152PZDZX007）

王涛(1986-)，男，博士研究生，高级工程师 E-mail：13623815363@163.com 通信作者：刘华（1962-），男，博士，博士生导师，研究员 E-mail：13903832971@163.com

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