电火花线切割法制备展开轮微结构及其摩擦性能分析

Microstructure of Friction Wheel Prepared by Wire EDM and Its Friction Performance Analysis

针对轴承钢球表面缺陷检测展开轮与钢球易产生相对滑动的问题,基于仿生学原理,以提高展开轮表面摩擦系数为目的,开展了对微结构展开轮的研究.介绍了拟采用的展开轮微结构,提出条纹形和网纹形的微结构形貌;使用电火花线切割法对展开轮的微结构进行制备,并使用HXD-1000显微硬度计对制得的微结构展开轮进行硬度测量,得到经过加工后的展开轮硬度变化情况;通过立式万能摩擦磨损试验机对制备的微结构展开轮进行摩擦性能实验并对其摩擦系数进行分析.结果表明:使用电火花线切割法制备的微结构展开轮表面边缘清晰,直线度良好,测得尺寸公差最大为30μm,沟槽类微结构呈圆弧形,硬度与无微结构的展开轮相近,相比无微结构展开轮,两种形貌特征的微结构展开轮摩擦系数分别提高21%~37%和10%~24%,对钢球表面展开过程中打滑的问题有较大程度的缓解.

Aiming at the problem that the bearing wheel and the steel ball are easy to produce relative sliding on the surface defect detection of the bearing steel ball,based on the principle of bionic tribology,the research on the microstructure development wheel is carried out with the aim of improving the surface friction coefficient of the unfolding wheel.The unfolding wheel microstructures to be used are introduced,and the stripe-shaped and textured-like microstructures are proposed.Then,the microstructure-expanding wheel is prepared by WEDM and fabricated by HXD-1000 microhardness tester.The microstructure of the micro-structured wheel is measured for hardness,and the hardness of the developed wheel after machining is obtained.Finally,the friction performance of the prepared microstructure-expanding wheel is tested by a vertical universal friction and wear tester and the friction coefficient is analyzed.The final conclusions show that the surface of the microstructure-expanding wheel prepared by WEDM is clear and the straightness is good.The measured dimensional tolerance is up to 30μm.The groove-like microstructure is arc-shaped,with hardness and no microstructure.Compared with the unstructured unrolling wheel,the friction coefficients of the microstructure of the two topographical features are increased by 21%~37%and 10%~24%,respectively,which alleviates the problem in the steel ball unwinding process to a certain extent.