磨粒辅助电火花加工金属基复合材料实验研究

Experimental investigation on metal matrix composite of abrasive particles aided electrical discharge machining

针对金属基复合材料的加工难题,提出了采用磨粒辅助电火花法加工该类材料。利用电火花加工和磨粒辅助电火花加工2种方法,对比研究了金属基复合材料加工时的材料去除率和表面粗糙度。利用正交试验法研究金属基复合材料中增强相的不同体积分数对加工效率的影响,得到了磨粒辅助电火花加工的最佳工艺参数。实验结果表明,磨粒辅助电火花加工法在材料去除率和表面粗糙度方面均优于电火花加工法,各加工参数对加工效率的影响从大到小依次为占空比、平均电流、脉冲宽度,复合材料的增强相的比例是影响加工效率的主要因素之一。

An abrasive aided electrical discharge machining（AEDM）method is developed to improve the performance of conventional EDM process in machining particulate reinforced metal matrix composites（MMCs）.This paper makes a contrastive research on material removal rate（MRR）and surface roughness（SR）of machining MMCs through two processes of EDM and AEDM.Attempting to receive the optimum process parameters of AEDM method,orthogonal experiment method is used to study the influence of MMC reinforced with different volume fraction phase on the machining efficiency.The experimental results show that the MMR and SR using AEDM method are better than those of EDM method.Moreover,effects of different process parameters on the machining efficiency are,from large to small,duty cycle,mean current,and pulse duration.This study also shows that the proportion of reinforced phase of the composite is one of the main factors affecting the machining efficiency.