级进模内球面偏心冲孔凸模刃口结构设计与侧向力控制

Punch structure design and lateral force control for eccentric holes blanking on inner spherical surface in progressive die process

级进模多产品共模生产时,针对产品内球面偏心孔冲裁产生的侧向力提出了3种刃口结构解决方案。对比分析凸模载荷-行程曲线和板料断面形貌,并结合生产现场验证发现,平面凸模对控制内球面偏心孔冲裁侧向力峰值幅度较为有利,且冲切断面光亮带较宽。所设计的多产品共模工艺方案保证了产品的精度和自动化生产的流畅性。

When different parts with the eccentric holes on the inner spherical surface are integrated in one progressive die process,the lateral force from punching should be concerned.Three solutions for the stamping process were developed.By analyzing the load-stroke curves of punch and the features of the cross-section of the eccentric holes blanking based on finite element（FE）simulation and the workshop stamping process,the flat cutting line of the punch was chosen compared with the other two cutter shapes.The flat cutting line causes the peak of the punching load to be smooth and the magnitude is lower than others.The flat cutting solution ensured the qualities of the stamping parts and maintained smoothness and efficiency of workflow.