摘要
为研究SiC颗粒对高速电弧放电加工的影响机理,基于高速电弧放电加工(BEAM),对体积分数20%,50%的碳化硅颗粒增强铝基复合材料(SiC/Al)进行了加工对比研究。基于Minitab软件设计了4因子(体积分数、峰值电流、脉冲宽度和脉冲间隔)2水平(低水平和高水平)的部分析因试验,用高速电弧放电加工专用机床研究了不同加工条件下SiC/Al的材料去除率、工具损耗率和表面质量。结果发现在相同加工参数下,体积分数20%,50%的SiC/Al表现出差距悬殊的加工特性,20%的SiC/Al加工效率远高于50%的SiC/Al,且前者的电极损耗率远低于后者,表明SiC体积分数是高速电弧放电加工SiC/Al性能的主导影响因子之一。通过测试及分析,认为SiC区别于基体材料的热传导特性是导致不同体积分数下的SiC/Al表现出不同加工特性的主要原因。
Based on the blasting erosion arc machining （BEAM） , behaviors of machining 20% and 50% （vol . ） SiC/Al composites by BEAM were studied to investigate the mechanism of SiC？s influence on blasting erosion arc machining. The partial factorial experiment of 4 four factors （volume fraction, peak current, pulse width and pulse interval） and two levels （low and high） were designed based on Minitab software. The machining performances of SiC/Al with different volume fraction, which were material removal rate, tool wear ration, surface integrity and heat transfer, were studied through special experimental setup of BEAM. The results indicate that the performances of machining the two materials are quite different even under the same parameters. The MRR （material removal rate） of machining 20% SiC/Al composites is much higher than that of machining 50% SiC/Al composites, and also the TWR （tool wear ration） of machining 20% SiC/Al composites is much lower. It is indicated that the SiC fraction of the SiC/Al composites is one of the main impact factors. By testing and analyzing, it is proposed that the heat transfer characteristics of the SiC particles are the main reasons which make the different fraction SiC/Al composites present different performances when machining with BEAM.
出处
《上海航天》
CSCD
2017年第1期110-115,共6页
Aerospace Shanghai
基金
国家自然科学基金资助(51235007
51575351)
自然科学基金创新群体项目资助(51421092)
机械系统与振动国家重点实验室重点基金资助(MSV201305)
上海市青年科技英才扬帆计划资助(15YF1405300)
关键词
高速电弧放电
SIC/AL
体积分数
加工性能
材料去除率
工具损耗率
表面质量
热传导
blasting erosion arc machining
SiC/Al
volume fraction
machining performance
material removal rate
tool wear ration
surface integrity
heat transfer
