UNSM技术在滚动轴承滚道修复中的应用与研究

Application and Research of Ultrasonic Nanocrystalline Surface Modification Technology in Rolling Bearing Raceway Repair

介绍了超声表面纳米化（UNSM）技术表面修复的工作原理。采用UNSM技术修复滚动轴承内外圈的滚道。通过光学显微镜、硬度仪、表面粗糙度仪和X射线衍射仪分析经UNSM技术修复的轴承内外圈滚道。结果表明,修复后的轴承内外圈滚道表面形貌得到改善。内圈滚道表面粗糙度从2.32μm降低至0.1μm,外圈滚道表面粗糙度从2.38μm降低至0.18μm;滚道表面硬度显著提高。内圈滚道最大残余压应力从-170 MPa提高至-530 MPa,且残余压应力的影响层可达60μm。

The working principle of the ultrasonic nanocrystalline surface modification technology（UNSM） was introduced, and the inner and outer raceway of the rolling bearing repaired by ultrasonic nanocrystalline surface modification technology was analyzed by optical microscope, hardness tester, surface roughness meter and X ray diffraction. The results show that the surface morphologies of inner and outer raceway of the bearing after restoration improve.The inner raceway surface roughness decreases from 2.32 μm to 0.1 μm. The outer ring raceway surface roughness decreases from 2.38 μm to0.18 μm. The raceway surface hardness improves. The maximum residual compressive stress of inner race raceway increases from-170 MPa to-530 MPa, and the influence layer of the residual compressive stress is up to 60 μm.