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针对内燃机缸套 活塞环摩擦副系统,开展缸套内表面单脉冲同点间隔多次激光微凹腔和微沟槽的工艺实验和数值模拟研究,分析了激光功率、激光脉冲次数对45#钢靶材表面微凹腔和微沟槽形貌的影响规律.研究结果表明,随激光功率的增加,微凹腔的深度增加幅度不大且趋于平缓,外沿金属残渣增多,光斑中心温度近似线性增加;增加激光脉冲次数,微凹腔深度增加显著,但金属熔液的重铸现象明显,表面加工质量下降;微沟槽深度和宽度随激光功率的增加都有所增加,且宽度的增幅较深度更为明显;相同工况条件下,仿真结果与实验结果趋势一致.“,”For internal combustion engine cylinderpiston ring System experimental and numerical simulation technology research of micro-cavities and micro-grooves with multiple single-pulse laser technology were put forward.The changes with laser power and laser pulse number of 45# steel surface microcavity and microgroove were analyzed The research results show that with the increase of laser power, the depth of microcavity increases marginally and tends to be gentle, and outer metal residue increases, and the spot center temperature rises linearly.With the laser pulse number increasing, depth of microcavity increases significantly, but recast phenomenon of molten metal result in the worse machined surface quality Microgroove depth and width increases with the increasing of laser power and the increasing rate of width is more obvious than the depth.Under the same conditions, the simulation and the experimental results are consistent.