混粉电火花加工介质击穿机理及工艺特性仿真研究  

Simulation Research on Breakdown Mechanism and Process Characteristics of Powder Mixed EDM

作　　者：王新荣[1] 任城龙 王冬[1] 张霞 WANG Xin-rong;REN Cheng-long;WANG Dong;ZHANG Xia(Mechanical Engineering College,Jiamusi University,Jiamusi Heilongjiang 154007,China)

机构地区：[1]佳木斯大学机械工程学院,黑龙江佳木斯154007

出　　处：《佳木斯大学学报（自然科学版）》2020年第5期74-77,共4页Journal of Jiamusi University：Natural Science Edition

基　　金：黑龙江省教育厅基本科研业务费基础研究项目(2016-KYYWF-0554)。

摘　　要：在电火花加工机理基础上,对混粉电火花加工极间介质击穿放电过程及材料去除机制进行了研究与仿真。探讨了粉末成分、浓度和粒度大小对加工表面粗糙度的影响机理,确定出获得理想加工效果的混粉工艺条件。对单脉冲放电工件表层的温度场进行仿真研究,得到放电蚀坑的深度与加工表面温度场分布之间的关系,分析峰值电流的改变对放电蚀坑深度及表面粗糙度的影响规律,并进行了解释。此成果为进一步掌握混粉电火花加工机制,为日后推广应用混粉加工新技术,使其成为精密模具加工的有效手段提供了一定的理论依据。Based on the EDM machining mechanism,the dielectric breakdown process and material removal mechanism of powder-to-electrode EDM machining were studied and simulated.The influence mechanism of powder composition,concentration and particle size on the surface roughness is discussed,and the mixing process conditions to obtain the ideal processing effect are confirmed.The temperature field on the surface of the single-pulse discharge workpiece is simulated,and the relationship between the depth of the discharge pit and the distribution of the temperature surface on the processing surface is obtained and explained.This result provides some theoretical basis for further use of the powder-mixed electric discharge machining mechanism as well as promotes the application of new powder-mixing processing technologies in the future.The result is an effective approach for precise mould-processing.

关 键 词：混粉电火花 机理 表面粗糙度 温度场 放电蚀坑 

分 类 号：TH16[机械工程—机械制造及自动化] TG661[金属学及工艺—金属切削加工及机床]