球铁曲轴零件的激光冲击强化

采用具有五轴联动数控工作台的高功率钕玻璃激光冲击强化系统，对球铁曲轴主轴颈和连杆轴颈的圆角部位实施冲击强化处理。实验中采用的激光波长为1.06 μm，脉宽为23 ns，脉冲能量为25～40 J。用流动的水帘作为激光冲击的约束层材料，硅酸乙酯作能量吸收层。对冲击后试件的残余压应力、硬度和耐磨性等进行了测量分析。结果表明，球铁曲轴经激光冲击强化后，受冲击部位没有明显的宏观变形，获得了较高的表面硬度和残余压应力，耐磨性比未冲击强化处理提高1.4倍，有效地提高和改善了曲轴的使用寿命。

Laser Shock Processing for a Crankshaft of Nodular Iron

The high power density, Nd:Glass laser shocking system with five-axes NC worktable was used to shock the fillet of main and rod surface of crankshafts. In the experiment, the parameters of laser shock processing are as follow: laser wavelength was 1.06 μm, pulse duration was 23 ns and output power ranged from 25～40 J. Flowing water and the ethyl silicate materials was used as confinement layer and absorbing medium respectively. Residual stress, hardness and wearability of the laser shocked surface were investigated as functions of laser processing parameters. The results show that the shocked zone has no obvious macro deformation,but the hardness and compressive stress of the laser processed surface was significantly enhanced,the wearability was increased about 1.4 times compared with those without LSP, which is favorable for the fatigue properties of crankshafts.