1. One-way bearing sealing material friction compatibility
The shaft diameter prevents direct adhesion and boundary lubrication when in direct contact with the bearing pads. The material factors that affect the frictional compatibility of the friction pair are:
(1) The degree of difficulty in forming an alloy by metallurgical materials.
(2) Affinity of materials and lubricants.
(3) The friction factor of the auxiliary material in the non-lubricated state.
(4) The microstructure of the material.
(5) Thermal conductivity of the material.
(6) The size of the surface energy of the material and the characteristics of the oxide film.
2, one-way bearing sealing material clampability
The bearing seal material allows the ability of external hard particles in the lubricant to be clamped to prevent scratching or (and) abrasive wear. For metal materials, the hardness is low and the modulus of elasticity is low, the clamping force is good, and the non-metallic material is not necessarily, for example, carbon graphite, the modulus of elasticity is low, but the clamping property is not good. One-way bearings usually use a softer material to form a frictional web with a harder material. Generally, a softer material is used as the bearing pad.
3, one-way bearing sealing material wear-in
In the running-in process of the shaft diameter and the bearing bush, the shaft diameter and the bearing machining error, the coaxiality error, and the surface roughness parameter value are reduced, so that the contact is uniform, thereby reducing the friction and wear rate.
When the advantages of chrome steel and stainless steel as a one-way bearing material were examined, it was found that they did not only have an anti-rust effect. Chrome steel is the most common one-way bearing material. It is harder than stainless steel, so it lasts longer. However, at higher temperatures, its performance is not good.
At a high temperature of 120C, it undergoes tremendous deformation and the load is reduced. It can withstand a high temperature of 150C, but an instantaneous temperature of 150C or higher will reduce the life of the one-way bearing. The heat treatment can subject the one-way bearing to an instantaneous high temperature of 170C.
The most common stainless steel 440 for one-way bearings, it is hard enough and strong to carry weight (20% less than brass steel), but it can resist rust, can withstand the instantaneous high temperature of 250C and the continuous high temperature of 300C. We often mistakenly think that all stainless steel is non-magnetic. 440 stainless steel is magnetic. It is not completely rust-proof, but is affected by salt, acid and alkali. The 316 grade has good rust resistance, no magnetic, but it is softer and therefore has less load. Because it is not strong, the 316 one-way bearing is not accurate and feels rough.
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