Surface roughness and roundness of bearing raceway machined by floating abrasive polishing and their effects on bearing’s running noise
Surface roughness and roundness of bearing raceway machined by floating abrasive polishing and their effects on bearing’s running noise
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DOI：
10.3901/cjme.2014.03.543
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发表时间：
2014-05
影响因子：
4.2
通讯作者：
G. Pang;Xuezhi Qi;Qinyi Ma;X. Zhao;Chunsheng Wen;W. Xu;Yanping Peng
中科院分区：
文献类型：
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作者：
G. Pang;Xuezhi Qi;Qinyi Ma;X. Zhao;Chunsheng Wen;W. Xu;Yanping Peng
表面粗糙度和圆度作为轴承滚道最重要的两个指标，对轴承噪声有着显著的影响。一些研究者已经开展了这方面的研究，但滚道表面几何特性对轴承运行噪声影响的原因和程度至今还不十分清楚。采用软磨料垫，采用浮动磨料抛光方法加工6309轴承内外圈滚道。测量了加工前后的表面粗糙度参数：轮廓算术平均偏差Ra、不规则点高度Rz、轮廓最大高度Rmax和滚道圆度f，并研究了测量结果的变化规律。研究结果表明，悬浮磨料抛光能显著降低轴承滚道表面几何误差。圆度误差降低25%，Rmax值降低35.5%，Rz值降低22%，Ra值降低5%。通过分析加工前后滚道几何参数的变化和形状差异，发现浮动磨料抛光方法主要通过修正滚道表面轮廓的局部偏差来影响圆度误差。对不同滚道面几何参数的轴承进行了装配和运转噪声测试。试验结果表明，Ra值对噪声影响较小，Rmax和Rz值对噪声影响较大，圆度误差对噪声影响较大。从控制轴承运行噪声的角度出发，应严格控制滚道圆度误差，表面粗糙度参数应重点控制Rmax和Rz。提出了一种超精加工后再用浮动磨料抛光加工滚道以获得低噪声轴承的有效方法。
As the two most important indexes of bearing raceway, surface roughness and roundness have significant influence on bearing noise. Some researchers have carried out studies in this field, however, reason and extent of the influence of raceway surface geometric characteristics on bearing running noise are not perfectly clear up to now. In this paper, the raceway of 6309 type bearing’s inner and outer ring is machined by floating abrasive polishing adopting soft abrasive pad. Surface roughness parameters, arithmetical mean deviation of the profile Ra, the point height of irregularities Rz, maximum height of the profile Rmax and roundness f of raceways, are measured before and after machining, and the change rules of the measured results are studied. The study results show that the floating abrasive polishing can reduce the surface geometric errors of bearing raceway evidently. The roundness error is reduced by 25%, Rmax value is reduced by 35.5%, Rz value is reduced by 22% and Ra value is reduced by 5%. By analyzing the change of the geometrical parameters and the shape difference of the raceway before and after machining, it is found that the floating abrasive polishing method can affect the roundness error mainly by modifying the local deviation of the raceway’s surface profile. Bearings with different raceway surface geometrical parameter value are assembled and the running noise is tested. The test results show that Ra has a little, Rmax and Rz have a measurable, and the roundness error has a significant influence on the running noise. From the viewpoint of controlling bearings’ running noise, raceway roundness error should be strictly controlled, and for the surface roughness parameters, Rmax and Rz should be mainly controlled. This paper proposes an effective method to obtain the low noise bearing by machining the raceway with floating abrasive polishing after super finishing.