Date: 2013-08-20

Common corrosion in NSK bearing failure analysis

　　NSK bearing scrap iron, burrs, dust and other foreign bodies to enter, will generate noise and vibration when the bearing in operation, can damage the raceways and rolling elements. Therefore, before installing the bearings, you must make sure that the mounting surface and clean installation environment.
　　Bearing surfaces coated with antirust oil, you need to carefully clean with clean petrol or kerosene, and then coated with a clean high quality or high speed and high temperature lubricant grease before installation. Cleanliness on life of NSK bearing noise and vibration effects are very large. But we wish to remind you of is: sealed bearings do not need cleaning and refueling.
　　NSK bearings are precision machinery, is vulnerable to the outside world, and causing damage, the following are some common damages:
　　1, electric erosion: bearings electric erosion refers to the motor or electrical leakage, bearing friction surfaces between EDM, bearings have point-like scar on the friction surface, characterized by damage of reciprocating formed on the hard surface of the axle;
　　2, fluid corrosion: corrosion in NSK bearing fluid is the fluid competitive impact on solid surface corrosion can cause fluid, formed the punctate scars on a solid surface, such damage surface smooth;
　　3, cavitation: cavitation is a solid surface of NSK bearings and made contact with the liquid form of surface damage produced by the relative motion of.
　　When lubricant oil film when a area of low pressure, bubbles can form in the oil, bubble motion to high pressure area, bubble under pressure in the crumble and fall, crumble and fall moments had a tremendous impact and high temperature bearings, solid surface under the impact of role over and over again, shedding material fatigue occurs, the friction surface formed of small pits, which developed into a cavernous scar.

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