模具钢Cr12电火花线切割多次切割表面微观形貌研究  

A Study on Surface Morphology of Die Steel Cr12 with Multiple Cutting in HSWEDM

作　　者：刘志东[1] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《电加工与模具》2010年第3期11-14,共4页Electromachining & Mould

基　　金：江苏省自然科学基金资助项目(BK20082566)

摘　　要：针对典型的模具钢材料Cr12,研究了采用复合工作液为介质的多次切割表面质量,并提出在最后一次切割中采用不含OH^-离子的煤油或压缩空气作为工作介质进行精修的方法。结果表明,切割表面产生硬化且由于介质中不存在电解质,以及放电后的温度升降梯度减缓,放电通道加大,能量密度减弱,材料表面的高温电解微孔洞及表面微裂纹大为减少,且表面粗糙度值明显降低,表面形貌得到显著改善。This paper studies the surface quality of Cr12,a typical material of die steel in China, in the condition of multiple cutting in HSWEDM using composite cooling liquid as dielectric.This paper proposes a novel method that by using mineral oil or compressed air,which doesn＇t contain OH^-, as dielectric in the last finishing cutting.By this measure,the results show that hardened layer can be achieved on the cutting surface and the number of micro-hole as well as micro-crack on the surface of Cr12 is decreased observably,which can be ascribed to a non-ion dielectric involvement,a smaller temperature grade and a decreasing discharge energy density because of increasing of discharging channel. Moreover,surface roughness and surface morphology is remarkably improved.

关 键 词：电火花线切割加工 多次切割 复合工作液 表面形貌 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]