Effect of hardness and processing roughness of lubrication-free bearings

The lubrication-free bearing has the characteristics of high bearing capacity, impact resistance, high temperature resistance and strong self-lubricating ability. It is especially suitable for heavy load, low speed, reciprocating or swinging, etc., which is difficult to lubricate and form oil film, and is not afraid of water and other acid. Etching and scouring. Lubricated bearing products have been widely used in metallurgical continuous casting machines, rolling equipment, mining machinery, molds, lifting machinery, textile machinery, wind power generation, ships, steam turbines, hydraulic turbines, injection molding machines and equipment production lines. Wear resistance is double that of ordinary bushings.
 
Superior performance of lubrication-free bearing materials:
 
1. Extremely high wear resistance and extremely low wear rate
 
2. Self-lubricating performance is good, friction coefficient is small
 
3. High impact strength and good toughness.
 
4. Excellent chemical resistance, resistant to almost all acid-base media (except concentrated sulfuric acid, concentrated hydrochloric acid, a few organic solvents)
 
5. Non-toxic, tasteless, no exudate
 
6. It has elasticity and shock absorption; it has good self-recovery and low water absorption.
 
7. It has good mechanical properties, can withstand large impacts and loads, and can effectively protect other components from mechanical damage due to its excellent toughness.
 
8. Excellent low temperature resistance, even at -176 ° C is not brittle.
 
The aging of the lubrication-free bearings is found from these four reasons:
 
First, the strong vibration is caused by the vibration of the lubrication-free bearing caused by the motor core failure. In this case, we have to replace the new lubrication-free bearings of the same model.
 
Second, the reason for the tightness is that the gap between the ball and the slide is too small, the torque becomes large, and the friction increases, so that the working temperature of the lubrication-free bearing is too high. Therefore, the correct lubrication-free bearing radial clearance should be adjusted as much as possible during installation.
 
Third, the material fatigue is due to the fatigue of the metal material, the lubrication-free bearing raceway and the debris falling off the surface of the ball fall into the grease, resulting in an increase in operating noise. Therefore, we should consider the normal fatigue of the lubrication-free bearing material and replace the new bearing of the same model.
 
Fourth, pollution corrosion, check the surface of the raceway and ball for red, brown spotted corrosion.
 
Lubrication-free bearing processing roughness: Regarding the influence of hardness and processing roughness, the lubrication-free bearing and the steel shaft have a tendency to increase the sliding sound when the roughness is large, but the material of the lubrication-free bearing is soft, so the rough surface will be caused when sliding. It is deformed and flat. Therefore, its influence is not very large. The steel shaft is hard and has no change when the surface of the makeup is rough, so the influence is considerable.