含氮模具钢电火花加工表面缺陷实验研究  

Experimental Study on EDM Surface Defects of Nitrogenous Mould Steel

作　　者：杨磊[1] 雍耀维[1,2] 彭威震 郭常宁[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]宁夏大学机械工程学院,宁夏银川750021

出　　处：《电加工与模具》2014年第2期10-13,共4页Electromachining & Mould

基　　金：宁夏自然科学基金资助项目(NZ12159)

摘　　要：含氮模具钢材料经电火花加工后,加工表面常会出现不同程度的裂纹与气孔。通过对STAVAX ESR、MIRRAX ESR、VANCRON 40等3种含氮量不同的模具钢进行电火花加工实验,深入研究了裂纹及气孔与材料成分、电火花脉冲参数之间的关系。结果表明:在相同加工条件下,表面产生气孔的数量随着材料含氮量的增加而增多;含氮模具钢中含有铬元素时,会加剧裂纹的生成;脉冲宽度增大时,裂纹密度及气孔量随之增加;峰值电流增大时,裂纹密度及气孔量随之降低。The varying degrees of cracks and pores generally appear on the finish surface of nitrogenous mould steel after EDM. The relationship between cracks or pores and material contents and pulse parameters was studied via EDM experiment for different nitrogen content mould steels. The results show that the pores quantity increases as the nitrogen contents of mould steel increases in the same condition. While nitrogenous mould steel contains Cr,it will aggravate the formation of cracks when EDM. The pores quantity and cracks density increase with the increment of pulse-on duration,while it decreases as peak current increases.

关 键 词：电火花加工 含氮模具钢 气孔 裂纹 脉冲参数 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]