慢走丝线切割单点放电温度场有限元分析  

Finite Element Analysis on Temperature Field by Single Spark Discharge in WEDM-LS

作　　者：孟雅俊[1] 沈娣丽[1] 李贺[2] 陈志[2] 张臻[2] 明五一[2] 

机构地区：[1]中州大学工程技术学院,河南郑州450015 [2]华中科技大学机械科学与工程学院,湖北武汉430074

出　　处：《机床与液压》2015年第17期143-146,共4页Machine Tool & Hydraulics

基　　金：国家自然科学基金资助项目(51175207)

摘　　要：建立了慢走丝电火花线切割单脉冲放电模型,利用有限元分析了单脉冲放电温度场分布。计算出该条件下工件放电凹坑几何特征,与实际切割条件下的材料去除率进行了对比,并根据电火花线切割的加工特点进行了修正。讨论了不同峰值电流和脉冲宽度条件下,蚀除凹坑体积与材料去除率(MRR)的变化规律,并分析了峰值电流和脉冲宽度对MRR的交互作用。分析结果表明:考虑实际加工的相关因素,模拟的单脉冲放电的MRR经修正后可以近似表征实际连续切割时的MRR;单个凹坑的蚀除量随着电流和脉宽的增大而增大,并且电流和脉宽的交互作用随着它们取值的增大而更加明显。Discharge model of single pulse was established on WEDM- LS,and the temperature field was analyzed based on finite element method. Discharge caves were engendered in workpiece,and the geometric features were calculated. The material removal rate( MRR) was compared with the actual cutting conditions,and simulation results were corrected based on processing characteristics of WEDM-LS. The relationships between MRR and parameters were also explored through simulation under different pulse-on time and current. The interaction between the current and pulse-on time on MRR was also analyzed. The analysis results show that the actual MRR can be approximated by the crater of single pulse discharge using modified expression,and the corrosion rate of the single discharge increases with the increase of current and pulse width. The corrosion of a single crater increases with the increase of current and pulse-on time,and the interaction is obvious when they are increasing.

关 键 词：慢走丝电火花线切割 单脉冲放电 有限元 温度场 材料去除率 

分 类 号：TG661[金属学及工艺—金属切削加工及机床]