激光清洗汽车刹车盘的表面形貌与工艺设计研究

Research on Surface Morphology and Process Design of Laser Cleaning Automobile Brake Disc

通过设计9组工艺方案,采用纳秒脉冲激光结合高速振镜,激光清洗汽车刹车盘表面的污渍,将获得的3组最优形貌参数进行典型的试验研究,结果表明,激光清洗后的表面光亮且平滑,最低表面粗糙度达到Ra(1.2±0.3)μm。选取的最优3组参数中,清洗层厚度最厚为(80±11)μm,表面显微硬度从原始的(360±13)HV提升到(598±26)HV。虽清洗后均表现为残余拉应力,但表面耐磨性显著提升,摩擦系数从8.56降到3.26。

In this study,nine sets of process schemes were designed to utilize nanosecond pulse lasers in conjunction with high-speed galvanometers for the purpose of clearing surface stains from automobile brake discs.Typical experimental studies were carried out on three groups of optimal morphology parameters,the results show that the surface after laser cleaning is bright and smooth,and the minimum surface roughness reaches Ra(1.2±0.3)μm.The thickness of the cleaning layer is about(80±11)μm in the three groups of optimal parameters,and the surface microhardness increased from the original(360±13)HV to(598±26)HV.Despite encountering residual tensile stress post-cleaning,there was a marked enhancement in surface wear resistance,accompanied by a reduction in the friction coefficient from 8.56 to 3.26.