锻压技术

基于Dynaform的球底筒形件充液成形回弹有限元模拟

英文标题：Finite element simulation on springback during hydroforming for cylindrical parts with spherical bottom based on Dynaform

作者：张泉达1 孙福臻1 吉日格勒1 王耀2

单位：1.中国机械科学研究总院集团有限公司先进成形技术与装备国家重点实验室 2. 河北工业大学机械工程学院

关键词：球底筒形件充液成形回弹减薄率正交试验

分类号：TG394

出版年,卷(期):页码：2023,48(5):275-281

摘要：

基于Dynaform模拟仿真，针对球底筒形件，以液室压力、压边力、凸模与板料之间的摩擦因数和成形高度为因素开展正交试验研究，分析不同条件下零件的壁厚变化和回弹规律。结果表明：通过充液成形制备球底筒形件可以实现低拉深系数成形，拉深系数可达0.42，零件形状良好，无开裂、起皱；影响零件减薄率的主要因素为液室压力、压边力和摩擦因数，影响最大回弹量的主要因素为成形高度。最终确定优化参数组合为：液室压力为50 MPa、压边力为20 kN、摩擦因数为0.05、成形高度为50 mm，该参数组合下零件的减薄率低、回弹量小，满足设计要求。相较于平底筒形件，在参数相同的条件下，两者的回弹量相近，但球底筒形件的厚度分布更均匀，有利于材料的充分利用。

Based on the simulation by Dynaform, for the cylindrical parts with spherical bottom, taking liquid chamber pressure, blank holder force, friction coefficient between punch and blank and forming height as the factors, the wall thickness change and the springback rule of parts under different conditions were studied by the orthogonal test. The results show that the cylindrical parts with spherical bottom by hydroforming can achieve the forming at low tensile coefficient, which can reach 0.42, and the parts get good shape without cracking and wrinkling. The main factors affecting the thinning rate of parts are liquid chamber pressure, blank holder force and friction coefficient, and the main factor affecting the maximum amount of springback is forming height. Finally, the optimization combination of parameters is determined as the liquid chamber pressure of 50 MPa, the blank holder force of 20 kN, the friction coefficient of 0.05 and the forming height of 50 mm. Under this parameter combination, the thinning rate of parts is low and the amount of springback is small which can meet the design requirements. Compared with the cylindrical parts with flat bottom, under the same parameter conditions, the two have similar amounts of springback, but the thickness distribution of cylindrical parts with spherical bottom is more uniform, which is conducive to the full use of materials.

基金项目：

中国机械科学研究总院集团有限公司技术发展基金（2021110032020656）

作者简介：张泉达（1986-），男，博士，高级工程师,E-mail：zhangquandadgu@163.com;通信作者：吉日格勒（1991-），男，硕士，助理工程师,E-mail：jirigele678@163.com

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