微细电火花线切割加工M42表面残余应力研究  

Research on Residual Stress of Micro Wire Electrical Discharge Machining M42 Surface

作　　者：丁海娟[1] 李小海[1] 郭黎滨[2] 王新荣[1] 赵利平[1] 冯凭[1] 

机构地区：[1]佳木斯大学,黑龙江佳木斯154007 [2]哈尔滨工程大学机电工程学院,黑龙江哈尔滨150001

出　　处：《佳木斯大学学报（自然科学版）》2017年第1期88-89,94,共3页Journal of Jiamusi University：Natural Science Edition

基　　金：黑龙江省教育厅科学技术研究面上项目(12531672)

摘　　要：微细电火花线切割表面在瞬间受热熔化并气化,继而快速冷却,会在零件表层产生残余应力,影响加工表面质量。采用XF-1型电解抛光仪逐层去除的方法,应用X-350型X射线残余应力分析仪测得M42钢微细电火花线切割加工表面残余应力分布。结果表明,微细电火花线切割加工表面残余拉应力自表面沿双向深度方向逐渐降低。当残余拉应力达到材料的强度极限时,就会在表面产生裂纹并扩展,进而降低零件的抗疲劳强度。The residual stress is produced easily on the surface of Micro Wire Electrical Discharge Machi- ning（MWEDM） during the melting and gasifying at the moment under heating and then cooling rapidly, and can influence the quality of surface. The residual stress distribution of MWEDM M42 surface is obtained with XF - 1 electro - polishing method for the removal layer by layer and X - 350 X - ray residual stress analyzer. The results show that the residual tensile stress decreases gradually from the surface along the two -way depth. The cracks produce and expand on the surface when the residual tensile stress is bigger than the ultimate strength of material, and then make the fatigue resistance of work piece decrease. In order to improve the quality of MWEDM surface, smaller machining specifications are permitted.

关 键 词：微细电火花线切割加工 变质层 残余应力 裂纹 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]