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Motor bearing corrosion cause and disposal plan

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Some large-scale electric fan motor production plants in Guangdong Province have such a situation; a group of motor assemblies have not experienced abnormal phenomena when they are tested before leaving the factory; they have passed the factory inspection to reach the qualified specifications; the packaging is shipped. Some products are shipped outside the province; Some even exported to the Middle East; but when the merchants received the goods, they found that the noise of the motor changed abnormally; after the motor was disassembled, the motor bearing was found to be severely corroded; except for the inner diameter and the end surface, there was corrosion; the primary corrosion direction was in the steel ball and the raceway. The touch; although the rusting procedures are different; but it affects the normal operation of the motor; the merchant returns it. This kind of incident not only affects the reputation of the motor factory; it also hinders the normal operation of the motor factory.
The motor manufacturer believes that there are problems in bearing quality and anti-rust disposal produced by the bearing factory; they find the bearing product quality inspection station; need to check the quality of the bearing; and help them deal with the problem of motor bearing rust.
Corrosion principle occurs when the motor bearing rust is very messy; it can be the bearing anti-rust treatment is not good; it can also be the corrosion caused by moisture; and the corrosion caused by the paint mist. It and the insulation paint variety, the bearing pre-filled smooth grease The method of disposing the motor paint and the storage environment of the motor have close contact. The samples of the rusted motor bearings are examined and analyzed. It is concluded that the corrosion of the motor bearing is corrosive by the stator wire package insulation paint inside the motor. The acid component is absorbed by the smooth fat together with the moisture; it is formed by the failure of the smooth grease enthalpy; especially in the steel ball and raceway touch orientation; the rust is more severe.
Disposal measures should prevent paint rust; it is necessary to improve the bearing's own rust resistance. The bearing information is usually bearing steel; the anti-rust treatment method usually uses anti-rust oil inside the bearing; the bearing after anti-rust treatment; The motor factory participates in the smooth grease by itself. However, if the anti-rust oil is too thick, it will reduce the smoothing function. Although it pays attention to improving the anti-rust function of the smooth grease; it has a certain effect; but the most useful method is to change the composition of the paint. .
Harmful acid gases will occur due to the paint; of course, the bearing will be rusted; the detailed disposal method is:
(1) Try to use solvent-free paint.
(2) If available; use an impregnating lacquer that does not contain oxidizing components; such as Epoxy-urethane-based or Epoxy-based impregnating varnish.
(3) When using melamine acid impregnating varnish; the curing temperature and curing time should be adjusted; the curing temperature is slightly higher than 130 ° C (such as 135 ° C) and the curing time is greater than 180 min; and it is necessary to strictly implement the process; In the high temperature and wet period; due to the concept of rust prevention; the paint of the paint factory in the sample of the boring (curing) moment; not necessarily sufficient; the motor has a detailed connotation shape.
(4) Select a paint that does not contain volatile acids.
(5) Select a paint with good hydrolysis resistance.
(6) Try to use mineral oil bearing smooth grease.
(7) When the motor factory writes the smooth grease by itself; in order to prevent the water vapor and dust from entering the bearing, noise and other rusting elements can be formed; the smooth grease container should be sealed; even in the case of grease injection And the amount of grease should be determined according to the specifications; if the 6202 bearing is used; the reference value is in the range of 0. 60 ~ 0. 80g; the grease filling process should be kept clean; boring.
(8) Use plastic film packaging with micro-holes; make the motor must be ventilated before it is used. When it is sealed with plastic film, the paint gas will remain in the bearing; the water will dew; it should be prevented.
(9) Smooth grease can be transformed under the influence of high temperature when the motor cover is sprayed or painted.
(10) Negotiate with the bearing manufacturer; use the more useful rust inhibitor when the bearing is produced.
(11) To completely dispose of the paint rust; to be able to think about the motor production plant, the bearing production plant and the paint production unit to participate in the discussion; to summarize the talents of all aspects; to deal with the corrosion of the bearing.

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