锻压技术

一种橡皮囊成形弯边零件的回弹补偿方法

英文标题：A springback compensation method for rubber bladder forming of flanged parts

作者：张凌云弥晓东黄杰石绍秋

单位：沈阳航空航天大学

分类号：TG386

出版年,卷(期):页码：2021,46(8):49-54

摘要：

在橡皮囊成形后的卸载阶段，由于钣金件内部残余应力的释放必然导致回弹，有时会造成制件几何尺寸超差、甚至报废。针对该问题，提出了采用经验公式法对曲线弯边的半径和弯曲型面进行补偿的算法，克服了有限元模拟位移调整法中多次迭代效率低、回弹补偿精度不高等问题，只需考虑钣金件的材料参数和几何尺寸，并配合二次开发软件即可快速生成曲线弯边零件的模具补偿工作型面。对典型的直弯边零件进行工艺试验验证，结果表明，弯边后零件的回弹角随着成形压力的增加而减小，回弹后零件的圆角半径与角度可控制在允许精度范围之内。

In the unloading stage of rubber bladder forming, the release of internal residual stress for sheet metal parts inevitably leads to springback, sometimes causes the geometric dimension of parts to be out of tolerance or even scrapped. According to the issue above, an empirical formula method was proposed to compensate the radius and curved surface of curved flanging, which overcame the defects of low efficiency of multiple iterations and low precision of springback compensation in the displacement adjustment method of finite element simulation and quickly generated the die compensation working surface of curved flanged parts by considering the material parameters and geometric dimensions of sheet metal parts and combining with the secondary development software. The results of the process test for typical straight flanged parts show that the springback angle of part after bending decreases with the increasing of forming pressure, and the fillet radius and angle of part after springback can be controlled within the allowable precision range.

基金项目：

航空基金项目（2011ZE54013）

张凌云（1963-），男，博士，教授 E-mail：zhangly@163.com 通信作者：弥晓东（1994-），男，硕士研究生 E-mail：823375894@qq.com

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