The performance of self-lubricating bearings to a large extent by the bearing surface roughness, hardness impact. High-quality shaft surface to extend bearing life. On the contrary rough, low hardness of the surface, reducing bearing life.
A, Shaft surface roughness
1, Used under fluid lubrication conditions, the mirror surface processing is required to be matched with the surface of the shaft to minimize the clearance of the oil film so as to be close to the fluid lubrication state so as to improve the performance of the bearing.
2, the bearing under dry friction conditions, as long as the control surface roughness Ra = 0.4-063 range.
B, shaft hardness
Shaft surface hardness of not less than 220HB. Under high load and rocking conditions, the shaft must be heat treated above HRC50 or hard chrome plated, and then ground. After surface treatment, corrosion resistance, surface hardness and lubrication can be improved. If the corrosion conditions in seawater and similar, matching shaft must be plated two to three hard chrome. Shaft surface roughness, sharp burr, groove will damage the bearing sliding layer.
Therefore, the choice of a good self-lubricating bearings manufacturer, but also select the relative qualified bearing material to allow self-lubricating bearings work.