微细电火花加工中材料蚀除机理的仿真研究

Simulative Study of Machining Mechanism of Material in Micro-EDM

微细电火花加工过程存在极大的复杂性和随机性,针对分子动力学模型以及基于传热学理论的数值模型在研究微细电火花加工机理时存在的不足,采用双温模型-分子动力学混合建模方法构建微细电火花加工中的阳极模型,并基于MPI并行技术建立相应并行仿真平台。仿真模型通过在放电通道电子系统内设置热源来模拟放电通道对阳极材料的热作用,进而通过分析放电加工过程中材料的晶格温度、应力和电子场温度的时间-空间演变过程等来分析阳极材料在不同能量输入情况下的蚀除机理。

Great complexity and randomness exist in micro-electrical discharge machining(micro-EDM) process. Considering the limitations of molecular dynamics model and numerical model based on heat transfer theories in studies on machining mechanism of micro-EDM, a hybrid modeling method in which the two-temperature model and molecular dynamics simulation model were integrated was used to construct the machining model for the anode in micro-EDM process, and the corresponding parallel simulation platform was built based on MPI technology. In this simulation model, a heat source was placed in the electron system to mimic the thermal action of the discharge channel on the anode material, and furthermore, by analyzing temporal-spatial evolutions of temperature and stress in the anode material and temperature in the electron system, different machining mechanisms of anode material were revealed correspondingly when different amounts of energy were input.