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Analysis of fretting wear of pitch bearings
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When the wind turbine is stopped at the wind and below the additional wind speed, the pitch bearing is in the non-working condition. Under the effect of the external oscillating impact load on the pitch bearing, the lubricating oil at the touch of the rolling body and the inner and outer rings cannot change the rolling body. When making up, the rolling body and the inner outer ring of the pitch bearing are simply subjected to fretting wear. The fretting wear is the micro-motion caused by the external oscillation caused by the relative displacement of the touch surface, and the displacement fluctuation is usually on the order of micrometers. The repeated effect of wear on the part can form the conflicting wear of the touch surface, and it can sprout fatigue cracks, reduce the fatigue strength of the part, and greatly reduce the fatigue life of the component. This is much more severe than the normal sliding wear.
The oscillation of the blade causes the oscillating impact of the pitch bearing. Therefore, the clearance of the pitch bearing should be zero clearance or a slight negative clearance value. Under the effect of these oscillating loads, the inner ring of the bearing will undergo a relative change. And the tendency of relatively skewed. In the absence of microscopic relative motion, there will be a combination of radial and tangential micro-motion between the ball and the ferrule.
Because the volume of the pitch bearing is large, it is still difficult to simulate the whole micro-motion experiment by simulating the field load. Therefore, the damage condition of the pitch bearing is studied by the operation and damage mechanism of the radial and tangential composite micro-motion. Detailed experimental ball / The plane touch is used to complete the composite fretting, and the damage characteristics of the actual working condition of the pitch bearing are studied.
Plate material bearing ring material 42CrMo, roughness Ra 018 μm. Steel ball data is GCr15, diameter 40 mm, roughness Ra 018 μm. Static load F = 15 kN, dynamic load 1 kN, load frequency is 10 Hz, the number of cycles is 100,000 times. Select the grease for the pitch bearing, use the flat specimen with different hardness, and experiment with the ball with different viewpoint touch, imitate the pitch bearing of the wind turbine when it is not working. Fretting damage, investigate the wear scar trace of the sample under different cycle times, and contact the experimental results of the literature to qualitatively analyze the fretting wear of wind power bearings.
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