Abstract: In order to improve the service life and detection accuracy of the unfolding wheels in the AVIKO series steel ball inspection system, and to improve the surface friction coefficient while redu-cing wear, the surface microstructures were applied to the unfolding wheels to study the friction and wear characteristics. Three kinds of pit microstructures with different diameter parameters were processed on the outer surfaces of the test pieces by laser, and the friction coefficient and wear amount were obtained through the tests with a self-designed friction and wear tester, and the distribution of stress and wear depth were obtained by numerical simulation. Compared and analyzed with smooth surface test pieces, the results show that the friction coefficient of the microstructure surface test pieces is larger and the wear amount is smaller under dry sliding friction conditions. The microstructure surface reduces wear and improves wear resistance by changing the stress distribution and dispersing the position of wear points. The established numerical simulation wear model may be used to predict the wear depth of microstructure surface, which provides a basic theory for the life prediction of microstructure surface unfolding wheels.

Key words: unfolding wheel, microstructure surface, friction and wear characteristics, wear depth, finite element numerical simulation

摘要： 为了提高AVIKO系列钢球检测系统中展开轮的服役寿命及检测精度，在增大表面摩擦因数的同时减少磨损，将表面微结构应用于展开轮，研究其摩擦磨损特性。利用激光在试件周向外表面加工三种不同直径参数的凹坑微结构，并用自主设计的摩擦磨损试验机进行试验，得到摩擦因数与磨损量，通过数值模拟得到应力分布图和磨损深度图，与光滑表面试件进行对比和分析。结果表明，在干滑动摩擦条件下，微结构表面试件均比光滑表面试件的摩擦因数更大且磨损量更小，微结构表面通过改变应力分布和分散磨损点位置减少了磨损并提高了耐磨性。所建立的数值模拟磨损模型可用于预测微结构表面磨损深度，为微结构表面展开轮的寿命预测提供了基础理论。

关键词: 展开轮, 微结构表面, 摩擦磨损特性, 磨损深度, 有限元数值模拟