Causes and prevention methods of eccentric bearing corrosion

Corrosion of eccentric bearing is caused by various internal and external factors, which are summarized as follows: 1. Metal surface finish (oxygen concentration difference battery corrosion). 2. The chemical composition and structure of the metal material itself. 3. Composition and pH of the solution in contact with the metal surface; 4. Ambient temperature and humidity. 5. Various environmental media in contact with the metal surface. 6, other people's sweat is also the cause of bearing corrosion, its pH is 5 ~ 6. Therefore, in order to prevent rust caused by hand sweat, the installation and production personnel should wear gloves, do not touch the imported bearings by hand.

Apply anti-rust oil to prevent rusting of eccentric bearing

1. Immersion method: Some small imported bearings are immersed in anti-rust grease. The thickness of the oil film can be achieved by controlling the temperature or viscosity of the anti-rust grease. A method of adhering a layer of rust preventive grease to the surface.

2, brushing method: pay attention to evenly spread on the surface of the imported bearing when brushing, do not produce accumulation, but also pay attention to prevent leakage coating.

3. Spray method: Some large-scale anti-rust materials are not suitable for oiling by immersion method. Generally, the compressed air with a pressure of about 0.7Mpa is sprayed in the air cleaning place. The spray method is suitable for solvent-diluted rust preventive oil or thin layer rust preventive oil. This method must use sound fire protection and labor protection measures.

Pretreatment method for rusting the surface of eccentric bearing:

1. Surface cleaning: Cleaning must be combined with the nature of the imported bearing surface and the conditions at the time. Commonly used methods are solvent cleaning, mechanical cleaning, and chemical cleaning.

2. Dry and clean the surface and dry it with filtered dry compressed air. Or use a drier to dry at a temperature of 120-170 ° C, and finally dry with a clean gauze.

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Detailed explanation of the bearing removal method for the loose frame

When the bearing retainer falls apart, the balls will converge to one side. When unpacking and replacing, the inner sleeve and outer sleeve of the NSK bearing are not integrated.

The first step is to measure the inner diameter of the bearing casing with a vernier caliper, for example, 55MM.

In the second step, a piece of iron plate with a width of about 20 mm and a thickness of about 5 mm and a length of about 60 mm is sawn.

The third step is to punch a central pit in the center of the iron plate.

In the fourth step, the center hole is taken as the center, and a circle with a diameter of 58 mm is planned with a circle.

In the fifth step, on the grinder, the excess part other than the original arc is trimmed according to the original arc.

In the sixth step, the iron plate is bent with a hammer (note that the camber is even) and the length of the iron plate after the hammer is bent is measured with a vernier caliper so that the size is 55.5 mm.

In the seventh step, a hole is drilled with a 5 mm drill bit on the center pit. And use M6 tap buckle.

In the eighth step, find a buttoned M6 long screw and screw it in from the concave surface of the iron bar (just out of the head)

In the ninth step, press the convex surface into the ball groove of the outer ring of the bearing in the direction of the "dead end".

In the tenth step, rotate the long screws in the direction of tightening. At this time, the bearing shell in the "dead end" may come out!

The eleventh step, if it is not good, take a magnet to suck, and will also suck out the jacket!

The twelfth step, no, if not, it means that the bearing is completely scrapped.

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