微冲裁对复杂截面形状落料件平面度影响的研究  

Study of the Influence of Micro-blanking on the Flatness of Blanked Parts with Complex Cross Sectional Shape

作　　者：郑吉鹏 刘云浩 杨君峰 张荣华 余祖元[1] ZHENG Jipeng;LIU Yunhao;YANG Junfeng;ZHANG Ronghua;YU Zuyuan(School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学机械工程学院,辽宁大连116024

出　　处：《电加工与模具》2025年第2期79-86,共8页Electromachining & Mould

基　　金：国家自然科学基金项目(52275408)。

摘　　要：针对平底面凸模冲裁复杂截面形状落料件时常见的平面度差的问题,首先利用非接触式轮廓仪和微冲裁设备采集的实验数据建立有限元仿真模型,分析304不锈钢和3J21合金两种材料落料件残余Mises应力分布与仿真平面度的关系;接着,为降低3J21合金落料件的平面度,依据落料件残余Mises应力分布与仿真平面度的关系,采用有限元方法设计非平底面凸模;最后,基于微细电火花加工技术在线制备了非平底面凸模的微模具,得到微小落料件平面度为5.48 μm,相比于平底面凸模冲裁的微小落料件平面度减少15.95 μm。结果表明,非平底面凸模冲裁使落料件表面残余Mises应力分布均匀,且改善了落料件的平面度。It was found that the flatness of micro blanked part is large when the micro part is with complex cross sectional shape.In this paper,the influence of micro die with un-flat bottom surface on the flatness of micro blanked part is studied.Based on the analysis of previous micro blanked parts and measurement data of corresponding parts using a profilometer,a finite element simulation(FEM)model was established to analyze the relationship between the residual Mises stress distributions of the blanked parts and the simulated flatness of the blanked parts of 304 stainless steel and 3J21 alloy.To reduce the flatness of micro blanked part,the bottom surface of micro die is designed based on the relationship between the residual Mises stress distribution and the simulated flatness of the blanked parts.To verify the validity of the designed micro die,a set of un-flat bottom surface micro punching mould is prepared on-line using micro electrical discharge machining(EDM)technology.Experimental results show that the flatness of micro blanked part obtained from the un-flat bottom surface design method proposed this paper is 5.48μm,which is 15.95μm less than that obtained by flat bottom micro die.It indicates that the bottom surface of micro die designed with uniforml residual Mises stresses improve the flatness of micro blanked part.

关 键 词：微冲裁 有限元仿真 微细电火花加工 平面度 非平底面凸模 

分 类 号：TG669[金属学及工艺—金属切削加工及机床]