Date: 2013-08-20

The material of choice is the key to the quality of the bearing

When the detection of chromium steel and stainless steel as SKF bearing material advantages, they are not only with rust. Chrome steel is the most common bearing material. It is harder than stainless steel, and therefore longer life. At higher temperatures, however, its performance is not how to.
    120c is a high temperature, it will occur to a great deformation, the load decreases. Continued 150c of the high temperature it can endure, but instantly 150c or higher temperatures will reduce FAG bearing life. Heat treatment allows the bearing to withstand the high temperature of the moment 170c.
Performance of the bearing material should have:
1. Friction compatibility
    Direct contact of the shaft and the bearing to prevent the adhesion and the formation of the boundary lubrication performance. The material impact Friction compatibility factors:
    (1) into the vice of Materials and Metallurgy constitutes the degree of difficulty of the alloy.
    (2) affinity and capacity of the material and lubricant.
    (3) into a vice material without lubrication state friction factor.
    (4) the microstructure of the material.
    (5) The thermal conductivity.
    (6) the size of the material surface energy and oxidative properties of the film.
    2. Clamp into sex
    Material allow external hard particles clamp into the lubricant to prevent scratching or (and) the ability to abrasive wear. The metal material, a low hardness and a low modulus of elasticity, the clamp into the like, while the nonmetallic materials are not necessarily, for example, carbon graphite, low elastic modulus, but the clamp into bad. Sliding bearing friction parcels usually with softer materials with harder materials constitute general use the softer materials do bush.
    3 run-in resistance
    Shaft diameter and bearing the running-in process, reduce the shaft diameter and bearing processing error, concentricity error, surface roughness parameter values, so that a uniform contact, thereby reducing the ability of the friction and wear rate.
    4. Friction compliance
    Material initially rely on the surface of the elastic and plastic deformation compensation sliding friction surface with the bad, and the shaft deflection performance. The elastic modulus of a material having low compliance preferred.
    5. Wear resistance
    Into vice material ability to resist wear. Predetermined wear conditions, the wear rate or the degree of wear, the reciprocal of the amount of wear to the wear resistance.
    6 fatigue resistance
    Ability to resist fatigue damage in materials under cyclic loading. At use temperature, the bush material strength, hardness, impact strength, and homogeneous resistance against fatigue is very important. Run-in, clamp good material, usually poor fatigue resistance.
    7. Corrosion resistance
    Material to resist corrosion. Lubricants when used in the atmosphere is gradually oxidized to produce an acidic substance, and also in the majority of the lubricating oil containing extreme pressure additives, corrosion NSK bearing material they will, therefore, bearing material needs to have corrosion resistance.
    8 cavitation resistance
    Solid phase for the movement of liquid state where, when the rupture of the bubbles in the liquid in the vicinity of the solid surfaces, generate localized impingement hypertension or local high temperature will cause cavitation wear. The material's ability to resist cavitation wear called cavitation resistance. Typically, copper lead alloy, tin-based bearing alloy and aluminum zinc silicon alloy good resistance to cavitation.
    9. Compressive strength
    Withstand the load without the pushed bad or size is not the ability to change one-way.
    Most common for TIMKEN bearing 440 stainless steel, it is enough hard and firmly to load (20%) less than the brass steel, but can rust can endure the continuous high temperature instantaneous high temperature of 250c and 300c. We often mistakenly thought that all stainless steel is not magnetic, 440 stainless steel is magnetic, it is not entirely the rust, but by the impact of salt, acid, alkali. Good anti-rust properties of the 316 level, not magnetic, but relatively soft so the load is less, it is not solid, INA Bearing accuracy is not high, rough feel.

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