为了在激光加热辅助切削(LAM)氮化硅陶瓷试验中获得较高的加工表面质量和加工效率, 实验并分析了各加工参数对温度分布和表面完整性的影响, 为在加工中选取合适的参数提供依据。利用ANSYS软件对切削区域温度场进行仿真, 探索了激光功率改变时温度的变化规律, 得到了各参数下的软化层深度, 并通过试验验证仿真结果的正确性。根据仿真得到的软化层尺寸选择合适的背吃刀量, 通过单因素试验确定主轴转速和进给速度的理想范围。结果表明, 在激光功率为180~210 W、主轴转速为700~900 r/min、进给速度为0.01~0.013 mm/r时按照仿真得到的背吃刀量进行试验可以获得较低的表面粗糙度和较高的材料去除率。研究表明, 试验结果与仿真结果基本吻合, 可以采取先仿真后试验的方法得到合适的加工参数, 从而达到在获得较高表面质量的同时提高加工效率的目的。

In order to obtain high surface quality and processing efficiency in the laser assisted machining of Si3N4 ceramic, the influence of each processing parameter on temperature distribution and surface integrity was analyzed,which provided a basis for selecting suitable parameters in machining. The ANSYS software was used to simulate the temperature field of the cutting area, the variation of temperature during laser power change was investigated. The depth of the softening layer under each parameter was obtained, and the correctness of the simulation results was verified by experiments. According to the simulated softening layer size, the appropriate depth of cut is selected, and the optimum range of the spindle speed and the feed speed is determined by a single factor test. The results show that the lower surface roughness and higher material removal rate can be obtained by testing at a laser power of 180 W, a spindle speed of 700~900 r/min, and a feed rate of 0.01~0.013 mm/r. Studies have shown that the test results are basically consistent with the simulation results, and the appropriate processing parameters can be obtained by the method of simulation and post-test, so as to achieve the purpose of improving the processing efficiency while obtaining high surface quality.