锻压技术

板状带凸台件的精冲-挤压复合成形分析及工艺设计

英文标题：Forming analysis and process design on combined forming of fine-blanking and extrusion for sheet metal parts with boss

作者：公冶凡娇吕琳邓明

单位：重庆理工大学

关键词：板状带凸台件精冲-挤压复合成形成形缺陷成形力挤压型凸台

分类号：TG386； TG376

出版年,卷(期):页码：2017,42(12):41-45

摘要：

总结了半冲孔型、挤压型和模锻型3种典型板状带凸台件的成形类型和特征，并以其中最具代表性的挤压型凸台作为研究对象，分析了板件挤压与正挤压在成形方面的区别，通过分析挤压型凸台成形过程中出现顶部凸起、底部缩孔、根部裂纹和外围凸包4种常见缺陷的原因，进一步提出了相应的解决措施。根据板件挤压凸台成形力的影响因素建立了计算板件挤压凸台成形力的经验公式。给出了在模具尺寸设计时，不同凸台相对高度下的挤压凸台底部孔直径的参考值；指出了凹孔直径即凸模直径越大，则成形力越大，对模具寿命不利。

Forming types and characteristics of three typical sheet metal parts with boss as semi-piercing，extrusion and die forging were summarized，and taking the extrusion boss as the leading example, the differences between sheet metal extrusion and forward extrusion were analyzed. Then, some corresponding measures were put forward by analyzing the causes of four common defects as the top bulge，the bottom shrinkage hole，the root crack and the peripheral convex hull in the extrusion boss forming process. According to the influence factors of forming force of extrusion boss for sheet metal, an empirical formula for calculating forming force of extrusion boss for sheet metal was established, and the reference values of the bottom hole diameter at various relative heights of boss were presented during die dimensions design. Furthermore, it was pointed out that a larger diameter of concave hole meant a larger diameter of punch，which led to a greater forming force and affected the life of die.

基金项目：

重庆市高校优秀成果转化项目（KJZH14107）

作者简介：公冶凡娇（1993-），男，硕士研究生 E-mail：634995850@qq.com 通讯作者：邓明（1960-），男，硕士，教授 E-mail：dm@cqut.edu.cn

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