中文摘要：

研究表明摩擦副表面的织构可以有效地改善表面摩擦学性能,提出了采用阴极掩模微细电解方法在活塞环表面加工阵列微坑的加工工艺。试验研究了不同绝缘层厚度和加工电压对曲面微坑尺寸的影响。选用优化的加工参数,进行了曲面微坑电解加工试验,在活塞环表面得到平均直径为250μm,深度为10μm的阵列微坑。参照发动机中活塞环/缸套摩擦副的工作原理,采用该加工方法加工出表面面积率不同,深度不同的多个活塞环试样进行摩擦试验。试验结果表明,与光滑曲面相比,带有适当面积率和深度的阵列微坑的试样表面可以有效地降低摩擦因数,起到抗磨减摩的作用。

英文摘要：

It is identified that surface texturing can improve tribological property.In this paper,a new electrochemical micromachining,in which the cathode is fixed with the mask,is proposed to generate micro-dimples array on piston ring surface.Effects of the thickness of insulation layer and machining voltage on dimensions of the micro-dimples were investigated experimentally.Using optimized machining parameters,micro-dimples array with 250 μm in diameter and 10 μm in depth is produced on the surface of piston ring.Friction tests,according to contacting between the piston rings and cylinder liner,were carried out for a variety of surface morphologies in which dimples are machined with different density and dimension.Experimental results show that the friction coefficient of the surface with appropriate micro-dimples array is obviously lower than that lapped smooth surface with non-dimples.