基于CATIA的橡皮成形凸曲线翻边毛料展开设计系统的二次开发

Secondary development of unfolding design system for convex flanging blank of rubber forming based on CATIA

为了使飞机橡皮成形件在CATIA环境下更好地展开,获得一个比较满意的毛坯料形状、降低材料成本,提出基于CAA(Component Application Architecture)的CATIA二次开发方法,设计并搭建基于几何法的橡皮成形毛坯料展开设计系统平台,并提供了具体开发实例。首先利用板料展开系统,对凸曲线零件数模进行操作,得到毛坯料尺寸形状,再利用"一步法"成形型面回弹补偿系统,设计刚性模具。最后进行橡皮成形试验与模拟仿真。通过对比成形零件与原始零件吻合程度,得到翻边高度误差在0.15 mm范围之内,并且竖边两侧端线与腹板面之间的角度接近90°,验证了板料展开系统的准确性。

In order to make the rubber forming parts in the aircraft unfold better in the CATIA environment, a secondary CATIA develop- ment method based on CAA （Component Application Architecture） was put forward to obtain a more satisfactory blank shape and reduce the cost of materials. Then, an unfolding system platform was designed based on geometric method, and the examples of specific blank de- velopment were provided. At first, the numerical model of the convex curve part was manipulated to obtain the blank shape by the sheet metal unfolding system, and then the rigid die was designed by the ＂one step＂ forming surface springback compensation system. Finally, the rubber forming test and simulation were carried out. By comparing the degree of fitting of the forming part with the original part, it is found that the flanging height distribution tolerance scope is within 0. 15 mm and the angle between both ends of vertical side and web surface is also close to 90°, and the accuracy of sheet unfolding system was verified.