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为了解决国产精密机床主轴轴承滚道表面因接触疲劳磨损而很快(运转十多分钟至两小时)就形成白亮带的问题,本文通过对滚道或滚子镀覆TiN层,MoS_2层和Ag层的真空镀层处理,以及对粗磨后的轴承套圈进行真空热处理等制成的试样,在模拟试验机上与原轴承的滚道及滚子作了对比试验研究,并就磨损表面的宏观状态和微观形貌进行了观察与分析。作者指出,TiN层由于硬度高和耐磨性好,可以防止滚道表面在运转过程小形成白壳带,但其弱点是使与之配磨的滚子磨损加剧而导致轴承的精度变差和使用寿命缩短;MoS_2层因其减摩抗磨作用良好,也能使滚道表面不形成白亮带;真空热处理可以消除粗磨造成的变质层,并能提高滚道表层的硬度和耐磨性,且其处理的工件变形比一般保护气氛下淬火的小,能够保证精加工余量和正确的几何尺寸,因而这种工艺是消除精密机床主轴轴承滚道表面白亮带的一种有效方法。
In order to solve the problem that white bright belt is formed quickly (more than ten minutes to two hours of operation) due to the contact fatigue wear on the roller bearing surface of the domestic precision machine tool, the TiN layer, MoS2 layer and Ag Layer of vacuum coating, as well as the coarse grinding of the bearing rings vacuum heat treatment and other samples made on the simulation test machine with the original bearing raceway and roller for a comparative study and study of the wear surface macro State and micro-morphology were observed and analyzed. The authors point out that due to the high hardness and good wear resistance, TiN layer can prevent the raceway surface from forming a small white shell belt during operation, but the weakness is that the wear of the roller with wear increases and the accuracy of the bearing deteriorates. The service life is shortened; the MoS_2 layer can make the raceway surface not white and bright because of its anti-friction and anti-wear effect; the vacuum heat treatment can eliminate the deterioration layer caused by rough grinding and improve the hardness and wear resistance of the raceway surface, And its processing deformation of the workpiece than the general protective atmosphere quenching small, to ensure that the finishing allowance and the correct geometry, so this process is to eliminate precision machine tool spindle bearing surface white belt with an effective way.