Overhaul of KOYO bearings

Cleaning of KOYO bearings: When disassembling KOYO bearings, first record the appearance of KOYO bearings, confirm the residual amount of lubricants, and then wash the KOYO bearings after sampling the lubricants for inspection. As a cleaning agent, gasoline and kerosene are commonly used. The cleaning of the removed KOYO bearings is divided into coarse cleaning and fine cleaning. They are placed in the container respectively, and the metal mesh bottom is placed first so that the KOYO bearing does not directly contact the container. In the case of rough cleaning, if the KOYO bearing is rotated with dirt, it will damage the rolling surface of the KOYO bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash.

Fine washing is to carefully clean the KOYO bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.

Inspection and judgment of KOYO bearings: In order to judge whether the removed KOYO bearings can be used, check them after cleaning the KOYO bearings. Check the condition of the raceway surface, the rolling surface, the mating surface, the wear of the cage, the increase of the KOYO bearing clearance, and the damage and abnormality that are irrelevant in dimensional accuracy. For non-separable small ball KOYO bearings, use one hand to support the inner ring horizontally and rotate the outer ring to check if it is smooth.

Separate KOYO bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring.

Large KOYO bearings cannot be rotated by hand. Pay attention to the appearance of rolling elements, raceways, cages, ribs, etc. The higher the importance of KOYO bearings, the more careful inspection is required.

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How to prevent FAG bearing corrosion

  FAG bearing corrosion is mainly divided into metal corrosion and human hand sweat, metal corrosion accounts for the majority, and in many cases can not be avoided. Hand sweat can also cause FAG bearing corrosion, mainly because sweat film will produce a sweat film on the surface, and the interaction will cause electrochemical reaction and lead to corrosion, but it can be avoided, such as tools with gloves for taking parts.

Metal corrosion mainly includes:

1 surface finish; 2 chemical structure and composition of metal materials; 3 solution composition and pH value of metal surface; 4 environmental medium; 5 ambient humidity and temperature.

Anti-rust pretreatment method:

Keep the surface clean and clean the appropriate method. General chemical treatment cleaning, mechanical cleaning and solvent cleaning methods. After the surface is cleaned, it can be dried by dry compressed air. It can also be dried with a dryer at 120~170 °C, and then dried with a clean gauze.

(1) Spray method

For example, some large-scale anti-rust materials can not be immersed in oil, mainly suitable for thin-layer anti-rust oil or solvent-diluted anti-rust oil, but pay attention to labor and fire protection measures.

(2) Brushing method

When brushing, it is not only necessary to avoid accumulation, but also to prevent leakage. It is generally suitable for some special-shaped products or outdoor construction equipment that do not use soaking or spraying.

(3) immersion method

The oil film thickness can be achieved by controlling the temperature or viscosity of the rust preventive grease. Some small items are immersed in anti-rust grease to adhere a layer of anti-rust grease to the surface.

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