基于温度场的C/SiC复合材料短电弧放电加工等效热源研究  

Temperature field-based equivalent heat source study for short arc discharge machining

作　　者：季玉 周建平[1] 汪兵兵[1,2] 秦曹阳 唐伟 JI Yu;ZHOU Jianping;WANG Bingbing;QIN Caoyang;TANG Wei(College of Mechanical Engineering,Xinjiang University,Urumqi 830000,CHN;College of Aeronautical Engineering,Changji University,Changji 831100,CHN)

机构地区：[1]新疆大学机械工程学院,新疆乌鲁木齐830000 [2]昌吉学院航空学院,新疆昌吉831100

出　　处：《制造技术与机床》2023年第4期9-14,共6页Manufacturing Technology & Machine Tool

基　　金：国家自然科学基金项目“航空薄壁零件低压微弧铣削加工放电通道演化规律与变形抑制方法研究”(52265061)。

摘　　要：针对C/SiC复合材料放电加工仿真普遍采用高斯热源,忽略间隙弧柱热效应的问题,文章以放电过程的热效应进行两部分等效。采用椭球体热源等效电弧弧柱,高斯面热源等效工件表面热效应,从平行和垂直于碳纤维两个方向进行温度场仿真,对比传统高斯热源与等效热源,并通过实验进行验证。结果表明:运用新型等效热源仿真,得到的凹坑尺寸比传统高斯热源更加接近实验加工的尺寸,预测精确度提高20%。In response to the problem that C/SiC composite electrical discharge machining simulations commonly use a Gaussian heat source and ignore the thermal effect of the interstitial arc column,this paper performs a two-part equivalence with the thermal effect of the discharge process.Using an ellipsoidal heat source equivalent to an arc-arc column and a Gaussian surface heat source equivalent to the surface thermal effect of the workpiece,temperature field simulations are carried out in two directions,parallel and perpendicular to the carbon fibre,comparing a conventional Gaussian heat source with an equivalent heat source,and verified by experiment.The results show that:using the new equivalent heat source simulation,the size of the crater obtained is closer to the experimentally machined size than the conventional Gaussian heat source,with a 20%improvement in prediction accuracy.

关 键 词：短电弧放电加工 等效热源 C/SIC复合材料 高斯热源 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]