S截面框肋类钣金零件回弹量预测与补偿技术研究及应用

Research and Application of Springback Prediction and Compensation Technology for S Cross-Section Frame and Rib Sheet Metal Parts

根据框肋类钣金零件高效、精确成形的要求,发展了一种S形截面类框肋零件回弹量计算与补偿方法,针对变曲率弯边,通过离散为弯边截面单元,计算每个截面线弯边单元的回弹量和补偿后重构弯边面,对带加强边的内缘弯边,提出考虑修正系数进行补偿的方法,基于现有的CAD平台开发了相应的软件工具;以实际零件为例说明了该方法的应用过程。成形工件测量结果表明,零件弯边角度偏差控制在±1°之内,实现了在新淬火状态下一步精确成形。

Aiming to manufacture the frame and rib parts rapidly and precisely, a springback prediction and compensation method for S cross-section part is presented. The part flange with variable curvature is divided into cross-section elements, and the springback of each cross-section element is predicted and compensated. Then the flange surface is reconstructed to build the model for forming. To the reinforced section of inner flange, the compensation factor is used to compensate the springback accurately. The method is used to develop flange springback prediction and compensation tools based on CAD system. The application process is illustrated by a case part. The measurement results indicate that the flange angle error is between-1° and 1°, and precise forming in one step is achieved.