关键词: 激光加热辅助引弧微爆炸加工, Si3N4陶瓷, 温度场, 有限元仿真

Abstract:

The paper introduced simply the technologies of laser assisted micro-detonation machining with striking arc and established its theoretical model of temperature field. Based on finite element theory, the temperature field of Si3N4 ceramics during laser assisted micro-detonation machining with striking arc was simulated with the aid of finite element analysis software. Furthermore, the influence of process parameters on temperature distribution was studied. The simulation results show the highest temperature is enhanced from 12 600℃ to 14 381℃ only with micro-detonation machining with striking arc. The temperature increases with increment of the laser power and decreases with growth of the size of light spot. With the increase of distance between the laser heating point and processing position, the temperature rises firstly and then drops. The effect of feeding speed on temperature is not so outstanding. The simulation results is reliable and can provide theory evidences for uncovering the machining mechanism of laser assisted micro-detonation machining with striking arc and choosing proper process parameters.

Key words: laser assisted micro-detonation machining with striking arc, Si3N4 ceramics;temperature field, finite element simulation