锻压技术

油阀套冷挤压工艺设计及研究

英文标题：Design and research of cold extrusion process for oil valve sleeve

作者：杨宁田海洋薛慧鹏郑伟刚

单位：贵州大学

分类号：

出版年,卷(期):页码：2015,40(7):53-57

摘要：

通过对油阀套零件的结构分析，初步制定了冷挤压工艺过程。运用Qform2D/3D软件对初始方案进行数值模拟，分析了零件成形过程中应力、应变状态，并观察材料填充情况。样品试制后发现成形挤压力过高，凸模折断。针对出现的问题对原方案中不合理的地方进行修改，设计了预先成形六角工艺方案，并依据滑移线场理论，采用图算法计算出挤压成形压力，再次进行数值模拟，结果显示，挤压力在模具许用应力范围内。同时，改用组合凸模结构、加强润滑措施来避免表面拉裂等缺陷。通过样品试制，验证了工艺改进方案合理可行，且试件尺寸精度满足技术要求。

A cold extrusion process was determined preliminarily by a structure analysis on the oil valve sleeve. The extrusion forming process was simulated by Qform2D / 3D software，and the stress and strain in the parts during the forming process were analyzed, and the material filling situation was observed. After trial production，it is found that the forming pressure is too high, and the punch is broken. In view of the above problems, the original scheme was modified. A new process of forming hexagonal in advance was designed. Based on the theory of slip line field, the extrusion force was calculated by graph algorithm. Then the forming process was simulated again. The results show that the extrusion force is within the allowable stress range of punch. Meanwhile， surface cracking is avoided by applying combined punch structure and strengthening lubrication. The feasibility of the new scheme is verified by producing sample, and the size accuracy can meet the requirement of performance specification.

基金项目：

贵州省科学技术厅、贵州大学联合资金项目（黔科合LH字\[2014\]7622号）

杨宁（1973-），男，硕士，副教授

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