锻压技术

矩形截面小圆角管件胀-压复合成形工艺

英文标题：Bulging-pressing composite forming process for small fillet tube with rectangular section

作者：刘志强金守一祝世强刘钢

分类号：TG394.2

出版年,卷(期):页码：2021,46(4):44-49

摘要：

对于精度要求高、圆角半径小、厚度分布均匀的矩形截面管件，传统的成形工艺难以成形出合格零件。采用有限元模拟和实验研究的方法，研究了矩形截面小圆角管件胀-压复合成形工艺，分析了内压、上模压下量等关键参数对零件圆角半径和壁厚分布的影响。结果表明，增大内压和上模压下量有利于圆角的填充，采用适当的内压和上模压下量，矩形试件的相对圆角半径可以达到0.86。与常规的内高压成形中圆角及附近减薄严重不同，胀-压复合成形工艺的圆角及附近区域具有增厚的现象，有利于获得壁厚更加均匀的小圆角零件。在对成形规律进行研究的基础上，建立了矩形截面小圆角管件的成形工艺窗口，成形出了满足形状与尺寸要求的管件

For the rectangular section tube with high precision, small fillet radius and uniform thickness distribution, the traditional forming process is difficult to form the qualified parts. Therefore, the bulging-pressing composite forming process of tube with rectangular section and small fillet was studied by finite element simulation and experiment methods, and the influences of key parameters such as internal pressure and downward displacement of upper die on the fillet radius and wall thickness distribution of part were analyzed. The results show that increasing internal pressure and downward displacement of upper die are beneficial to the filling of fillet, and the relative fillet radius of rectangular component reaches 0.86 by appropriate internal pressure and downward displacement of upper die. Furthermore, different from the serious thinning of fillets and nearby areas in the traditional hydroforming, the fillets and nearby areas are thickened by the bulging-pressing composite forming process, which is beneficial to obtain the small fillet part with more uniform wall thickness. Thus, on the basis of the study of forming law, the forming process window of tube with rectangular section and small fillet is established, and the tube meeting the requirements of shape and size is formed.

基金项目：

国家高层次人才特殊支持计划项目（W020239）

刘志强（1990-），男，博士研究生 E-mail：lzhq241@163.com 通讯作者：刘钢（1970-），男，博士，教授 E-mail：gliu@hit.edu.cn

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