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Fag bearing corrosion is mainly divided into metal corrosion and human hand sweat. Metal Bearing Corrosion corrosion accounts for the vast majority and can not be avoided in many cases.
Hand sweat can also cause corrosion of fag bearings, mainly because sweat film will be Bearing Corrosion generated on its surface when sweat contacts, and electrochemical reaction will occur during interaction, which can lead to corrosion, but it can be avoided, such as wearing professional gloves and other tools to take parts.
Metal corrosion mainly includes:
① Surface finish; ② Chemical structure and composition of metal materials; ③ Solution Bearing Corrosion composition and pH value of metal surface; ④ Environmental media; ⑤ Ambient humidity and temperature.
Rust prevention pretreatment method:
Keep the surface clean and use appropriate methods for cleaning. General chemical treatment Bearing Corrosion cleaning, mechanical cleaning and solvent cleaning. After the surface is cleaned, it can be dried with dry compressed air or with a dryer at 120 ~ 170 ℃, and then wiped with clean gauze.
(1) spray method
For example, some large antirust substances cannot be oiled by immersion method, which is mainly applicable to thin-layer Bearing Corrosion antirust oil or solvent diluted antirust oil, but pay attention to labor and fire protection measures.
(2) Brush coating method
When brushing, it is not only necessary to avoid accumulation, but also to prevent coating Bearing Corrosion leakage. It is generally applicable to some special shape products or outdoor construction equipment that are not suitable for soaking or spraying.
(3) Immersion method
The oil film thickness can be achieved by controlling the temperature or viscosity of Bearing Corrosion antirust grease. Some small items are soaked in antirust grease to make their surface adhere with a layer of antirust grease.
When inspecting the removed NTN bearing during the regular maintenance and operation of NTN bearing equipment and the replacement of peripheral parts, it is necessary to judge whether the secondary NTN bearing parts can be reused and record the good or bad use.
It is also necessary to carefully investigate and record the removed NTN bearings and appearance. In order to find out and investigate the remaining amount of lubricant, the NTN bearing should be well cleaned after sampling.
Secondly, check the raceway surface, rolling surface and mating surface of NTN bearing and the wear state of cage for damage and abnormalities, especially observe the running track of raceway surface.
To judge whether the NTN bearing can be reused, it should be decided after considering the damage degree of NTN bearing, machine performance, importance, operating conditions, inspection cycle, etc.
According to the inspection results, if NTN bearing is found to be damaged or abnormal, please find out the causes and formulate countermeasures according to the damage of NTN bearing.
In addition, according to the inspection results, if there are the following defects, the NTN bearing can no longer be used and needs to be replaced with a new NTN bearing.
a. Any one of the inner and outer rings, rolling elements and cage has cracks and fragments.
b. Any one of the inner and outer rings and rolling elements has peeling.
c. The raceway surface, retaining edge and rolling element are significantly jammed.
d. The cage is seriously worn or the rivets are seriously loosened.
e. The raceway surface and rolling element are rusty and scarred.
f. There are significant indentation and indentation on the rolling surface and rolling element.
g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.
h. Overheating and discoloration.
i. The sealing ring and dust cover of grease sealed NTN bearing are damaged seriously.