Causes and prevention methods of corrosion of imported bearings

Core Tip: Causes and Preventive Measures for Corrosion of Imported Bearings Corrosion of imported bearings is caused by various internal and external factors. The main conclusions are: 1. Metal surface finish (poor oxygen concentration)
Causes and prevention methods of corrosion of imported bearings
  Corrosion of imported bearings 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, the composition of the solution in contact with the metal surface and the pH;
  4, ambient temperature and humidity.
  5. Various environmental media in contact with the metal surface.
  6, another person'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 skf bearing from rusting

  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 uniform application on the surface of the imported bearing when brushing, do not cause accumulation, and also pay attention to prevent leakage.
  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 an 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 skf 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, the surface is dry and cleaned, and then dried by filtered dry compressed air. Or use a dryer to dry at 120~170 °C, and finally dry with a clean gauze.

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What are the methods for removing common rolling bearings?

Core Tips: Commonly used disassembly methods for rolling bearings are: tapping method, pull-out method, pushing method, and hot-breaking method. First, the tapping method is generally applied to the inner ring of the bearing, and the striking force should not be added to the shaft.
Commonly used disassembly methods for rolling bearings are: tapping method, pull-out method, pushing method, and hot-breaking method.

First, the tapping method

The tapping force is generally applied to the inner ring of the bearing. The striking force should not be added to the rolling element and the cage of the bearing. This method is simple and easy, but it is easy to damage the bearing. When the bearing is at the end of the shaft, it is smaller than the inner diameter of the bearing. A copper rod or other soft metal material is placed against the shaft end, and a pad is placed at the lower part of the bearing, and the hammer is gently tapped with a hammer to remove it. Applying this method should pay attention to the position of the pad to be placed properly, and the focus should be correct.

Second, the pull out method

A special puller is used. When disassembling, the bearing will be pulled out slowly as long as the handle is rotated. When the outer ring of the bearing is disassembled, the angle of the two legs of the puller should be opened outwards; when the inner ring of the bearing is removed, the two legs of the puller should be inward and snapped onto the end face of the inner ring of the bearing.

  Precautions:

1. The pull hook of the puller should be hooked on the inner ring of the bearing, and should not be hooked on the outer ring to avoid excessive looseness or damage of the bearing;

2. When using the puller, align the screw to the center hole of the shaft and do not skew. Should also pay attention to the force of the hook and the bearing, do not damage the hook and bearing;

3. Pay attention to prevent the hook from slipping off;

4. The angle of the two legs of the puller is less than 90°.

Third, push method

The bearing is pressed by the press, and the work is stable and reliable without damaging the machine and the bearing. The press has manual pushing, and the mechanical or hydraulic press pushes.

Note: The pressing point of the press should be on the center of the shaft and should not be biased.

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