基于生死单元的激光铣削温度场数值模拟与验证

Numerical simulation and test of laser milling temperature field based on birth-death elements

利用ANSYS有限元模拟软件建立了激光铣削过程的三维瞬态有限元模型,并以Al2O3陶瓷材料的激光铣削加工为例,利用ANSYS中的"单元生死"技术对激光铣削过程中温度场的动态分布进行了模拟。选取其中的一组参数,详细分析了铣削件表面某一点温度场的变化规律,确定了沿样件不同的扫描路线上铣削层的宽度和深度,并提出了温度场模拟结果的间接验证方法,即将温度场模拟获得的铣削层宽度和深度与实验测得的数据进行对比,对比结果较吻合,说明建立的有限元模型能够进行激光铣削效果的预测。

A three-dimensional transient state finite element model of the temperature field of laser milling has been established based on ANSYS software. As an example, Al2O3 ceramic material has been milled by laser to simulate the temperature field. The dynamic distribution of the temperature field was simulated during the laser milling process. A group data were chosen to analyze the change orderliness of the temperature on the sample surface. The milling width and depth were determined along different scanning route. An indirect verification method was put forward to test the result of the simulation. The milling layer width and depth of the temperature simulation were compared with the experimental data. The result shows all the data can be coincided, which show the finite element model can predict the effect of laser milling.