Laser polishing is the process of removing surface irregularities from a material by melting or removing the material surface using the strong heat generated by the interaction between the irradiated laser beam and the material. In this study, a pulsed laser micro polishing system was fabricated, and its performance was evaluated for the surface polishing of AISI 4140 mold steel. The surface of AISI 4140 mold steel was machined using laser beam scanning based on spatial components (dots and lines) and conditions to minimize the roughness of the machined surface were derived. In addition, mapping between the laser power and scan speed, and the surface roughness results was performed. Polishing was performed using the derived process parameters to analyze the surface roughness and characteristics of pulsed laser polishing, and the surface characteristics through the grinding process and WEDM (wire electro-discharge machining) were compared and evaluated. Finally, the residual stress of the surface subjected to grinding, wire electro-discharge machining, and laser polishing was measured.

激光抛光是利用照射的激光束与材料之间相互作用产生的强热熔化或去除材料表面来去除材料表面不规则之处的过程。在这项研究中，制造了脉冲激光微抛光系统，并评估了其对 AISI 4140 模具钢表面抛光的性能。AISI 4140 模具钢的表面使用基于空间分量（点和线）的激光束扫描进行加工，并推导出使加工表面粗糙度最小化的条件。此外，还进行了激光功率和扫描速度之间的映射，以及表面粗糙度结果。使用导出的工艺参数进行抛光，以分析脉冲激光抛光的表面粗糙度和特性，并对磨削加工和 WEDM（线材电火花加工）的表面特性进行比较和评价。最后，测量了经过研磨、线材放电加工和激光抛光的表面的残余应力。