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激光加工连杆轴颈与曲柄连接处圆角区域曲面时,激光光束不能保证与曲面上每点切线方向始终是垂直的,这个过程就是激光斜冲击强化过程。本文用江苏大学激光技术研究所生产的YAG激光器,斜冲击强化连杆轴颈与曲柄连接处圆角区域。冲击后在受冲击区域显微硬度比未冲击区域提高了65%-75%左右,残余应力比未冲击区域提高了80%-100%左右,使用寿命提高了150%。而这种显微硬度和残余压应力的提高对提高材料的疲劳寿命、抗磨损能力和抗腐蚀能力等表面机械性能都是有益的。激光斜冲击曲轴连杆轴颈与曲柄处圆角,残余应力和显微硬度提高最大处为圆角中心处,而这个位置正是易产生疲劳裂纹处,而圆角边缘处是疲劳强度非敏感区,对裂纹的产生影响不大。
Laser processing connecting rod journal and crank at the fillet area surface, the laser beam can not guarantee that every point along the surface tangential direction is always vertical, this process is the laser oblique impact strengthening process. In this paper, YAG laser produced by Institute of Laser Technology of Jiangsu University, oblique impact to strengthen the connecting rod and crank connecting rod fillet area. After impact, the microhardness in the impacted area is increased by 65% -75% compared with that in the non-impacted area, the residual stress is increased by 80% -100% compared with that in the non-impacted area, and the service life is increased by 150%. This increase in microhardness and residual compressive stress is beneficial for improving surface mechanical properties such as fatigue life, abrasion resistance and corrosion resistance of the material. Laser oblique impact crankshaft connecting rod crankshaft fillet, the maximum increase in residual stress and microhardness at the fillet center, and this location is easy to produce fatigue cracks, and fillet edge fatigue strength is not sensitive District, the crack produced little effect.