Al2O3陶瓷引弧微爆炸加工温度场模拟

建立了Al2O3陶瓷引弧微爆炸加工(micro-detonationofstrikingarcmachining,MDSAM)过程的 传热模型,基于有限元理论,利用ANSYS软件对加工过程中的温度场分布进行了模拟。结合材料性质,对模 拟和实验得到的蚀坑尺寸进行了比较,并分析了加工参数对温度场的影响。模拟结果表明,Al2O3陶瓷引弧 微爆炸加工时在给定的加工参数下的最高温度可达13435℃,且高温影响区范围很小,加工实验与模拟结果 符合较好。随着脉冲宽度和工作电流的增加,加工区域的温度以及蚀坑的半径和深度增大;随着喷嘴半径的 增大,加工区域的温度降低而蚀坑的径深比增大。模拟结果可为Al2O3 陶瓷引弧微爆炸加工过程中表面形 貌的预测、材料去除机理的揭示以及加工参数的选择等提供参考。

Numerical simulation of temperature field for Al2O3 ceramics during micro-detonation of striking arc machining

A thermal transfer model for Al2O3 ceramics during micro-detonation of striking arc machining(MDSAM) was established.Based on the finite element theory,the temperature field of Al2O3 ceramics during MDSAM was simulated with the aid of the ANSYS software.Combined with the material properties,the simulated cavity dimension was compared with the machining experimental result and the effects of the machining parameters on the temperature field were analyzed.The simulated results show that the highest temperature of Al2O3 ceramics during MDSAM can reach 13 435 ℃ with the given machining parameters.The heat-affected zone is quite small and the machining test is consistent with the simulated results.With the increase of the pulse width and the working current,the temperature of the processing region and the radius and depth of the cavity increase.The temperature decreases with the increase of the nozzle radius,whereas the diameter-to-depth ratio of the cavity increases.The simulated results can provide an important reference for the prediction of the surface topography,the disclosure of the material removal mechanism,and the optimization of the machining parameters for Al2O3 ceramics during MDSAM.