钢球检测用展开轮表面微结构增摩降磨特性分析

针对钢球缺陷检测过程中,镜面钢球打滑引起的滑动摩擦导致展开轮磨损这一问题,以实现展开轮增摩降磨为目标,提出将微结构应用于钢球展开轮表面的方法.首先,应用激光微造型技术在T10A试件表面加工不同特征参数凹坑微结构,采用单因素法在MMW-1立式万能磨擦试验机上进行点接触干滑动摩擦试验;在综合考虑局部激光硬化和几何参数对磨损性能影响的基础上,结合试验数据建立基于Archard理论的微结构磨损模型;最后通过仿真技术及磨损试验验证磨损模型的正确性,进而对微结构特征参数进行优选.结果表明:在点接触干滑动摩擦工况下,提出的三种微结构表面均可以实现增摩降磨;建立的磨损模型能准确地计算磨损系数用以分析实际工况的磨损特性;优选了凹坑面积在S_2~S_4范围内的菱形微结构.提出的方法为钢球表面缺陷检测设备提供了技术支持,所建的磨损模型为干摩擦状态下凹坑微结构表面磨损程度的预测提供了理论参考.

Analysis of Friction and Wear Properties of Microstructure on the Unfolding Wheel Used for Steel Ball Inspection

The problem of the unfolding wheel wear in the defect inspection process caused by the sliding friction from mirror ball slipping was solved by applying the patterns on the surface of the unfolding wheel to increase friction and reduce wear. The patterns with different characteristic parameters on the surface of the T10A specimen were processed by the laser micro-texturing technology. Single factor analysis method was used to test the point contact dry sliding friction on the MMW-1 vertical universal friction tester. Considering the comprehensive influence of both local laser hardening and geometrical parameters on the wear properties, the wear model of patterns based on the Archard theory and the test results was built. Finally, simulation technology and wear test were utilized to verify the wear model, thereby optimizing the characteristic parameters of the patterns. The results show that under the point contact dry sliding friction condition, three kinds of patterned surfaces increased friction and reduceds wear. The wear was accurately calculated using the wear model, and this is useful for determination of the wear properties under actual working conditions. The optimized diamond patterns with the pit area in the range of S₂~S₄ was selected. The proposed method provided the technical support for the defect inspection equipment of steel ball surface. Meanwhile, the proposed wear model provided a theoretical reference for the prediction of the patterned surface wear under dry friction condition.