水导激光去除不锈钢表面漆层的温度场仿真与试验

Simulation and Experiment of Temperature Field for Water-guided Laser Removal of Paint on Stainless Steel Surface

为了在水导激光去除不锈钢表面漆层试验中获得能够不损伤基体表面且完全除漆的加工参数,基于材料热物理性参数与温度变化的关系,运用Ansys建立了水导激光对不锈钢基体表面除漆的三维瞬态模型。在仿真加工过程中进行数值模拟研究,得到了加工过程中温度场的分布情况。通过单因素仿真试验找到了激光峰值功率、脉冲宽度和加工速度对温度场分布的影响规律。仿真结果表明,最高温度集中在热源中心,且随着激光峰值功率和脉冲宽度的增大而增大,随着加工速度的增大而减小。根据316 L不锈钢基体最高使用温度及氟碳漆层熔化温度结合仿真温度场分布确定了较优工艺参数,并进行试验,发现仿真预测值与试验结果相近,证明了水导激光对不锈钢基体表面除漆有限元仿真的可行性。

Based on the relationship between the material′s thermophysical parameters and temperature change, a 3 D transient model of waterguided laser for removing paint on the surface of stainless steel matrix was established with Ansys, and the distribution of temperature field was obtained through numerical simulation during the simulation process. The influence of peak laser power, pulse width and processing speed on the distribution of simulated temperature field is found through single-factor simulation test. The simulation results show that the maximum temperature is concentrated in the center of heat source, and increases with the increase of laser peak power and pulse width, and decreases with the increase of processing speed. According to the maximum working temperature of 316 L stainless steel substrate and the melting temperature of fluorocarbon paint layer combined with the distribution of simulated temperature field, the optimum technological parameters were determined. The simulation predicted value was close to the test result, which proved the feasibility of the finite element simulation of water-guided laser on the surface of stainless steel substrate for paint removal.