Hardware knowledge classroom: analysis of the cause of bearing metal peeling

The main reasons that easily cause the bearing metal to peel off are as follows:

1. Bearings are subjected to impact and alternating loads, which are easy to cause fatigue and peeling on the surface of the raceway and rolling elements. Repeated changes in the contact stress on the surface of the rolling elements can also cause metal fatigue, pitting and fineness on the surface of the rolling elements Flaking. This kind of flaking starts to be very small, and then dents will appear and gradually expand, showing a large area of u200bu200bflakes.

2. The axial mating step surface of the inner and outer rings of the bearing is not vertical, the rotating shaft is bent, and the shaft hole is not concentric, which causes the installation of the inner and outer rings of the bearing to be skewed, causing the local raceway of the bearing to bear excessive load and cause the metal to peel off.

3. The bearing clearance adjustment is too tight.

4. Iron filings or hard foreign objects fall between the bearing inner ring and the shaft or the outer ring and the mating surface of the seat hole, causing the raceway to deform when the bearing is installed, causing the bearing raceway to bear excessive load locally, resulting in metal peeling .

5. The journal and the seat hole that are matched with the bearing are deformed seriously, which causes the local load of the raceway of the ring to be too heavy, resulting in fatigue spalling. For example, in angular contact ball bearings, spalling often occurs in two symmetrical parts of the ring.

6.Improper selection of the bearing, the selected substitute bearing or the replaced bearing has insufficient load bearing capacity.