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讨论了激光热抛光时工件表面上的能量密度的控制原理及实时控制方法,研制了一套激光能量密度实时控制系统。采用连续激光源和CCD-FPGA图像处理反馈模块,实时控制在待抛光物体上的光斑面积大小进而实现脉冲激光能量密度的恒定。利用激光抛光系统对316L不锈钢进行实验,分析了恒定脉冲激光能量密度的方法和研制的激光抛光系统的特性,研究表明经脉冲激光热抛光后其表面粗糙度大幅度降低,由292.3nm降至146.6nm。
The control principle and real-time control method of energy density on the workpiece surface during laser thermal polishing are discussed. A real-time laser energy density control system is developed. The continuous laser source and CCD-FPGA image processing feedback module are used to control the area of the spot on the object to be polished in real time so that the pulse laser energy density can be kept constant. The experiment of 316L stainless steel was carried out by laser polishing system. The method of constant pulse laser energy density and the characteristics of the developed laser polishing system were analyzed. The results show that the surface roughness decreased greatly from 292.3nm to 146.6 after pulsed laser thermal polishing nm.