How to lubricate and maintain IKO bearing repair method

1, IKO bearing cleaning

When removing the IKO bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the moisturizer, and then wash the bearing after sampling and checking the moisturizer. As a cleaning agent, gasoline and kerosene are commonly used.

The cleaning of the removed bearing is divided into coarse cleaning and fine fine washing. In the container, the metal mesh bottom is placed first, so that the IKO bearing does not directly contact the container. During rough cleaning, if the bearing is rotated with dirt, it will damage the IKO bearing rolling surface and should be noted. In the rough cleaning oil, use a brush to remove the moisturizing grease and sticks. After it is almost clean, transfer it to a fine wash.

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

2. Overhaul of IKO bearings

In order to judge whether the removed IKO bearing can be reused, check the bearing after cleaning, carefully check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of IKO bearing clearance and whether there is any Damage and abnormality with reduced dimensional accuracy. For non-separable ball bearings, use one hand to support the inner ring and rotate the outer ring to check if it is smooth.

1, oil bath moisturizing

Oil bath moisturizing is the most common moisturizing method in IKO bearings, suitable for moisturizing low and medium speed bearings. Part of the bearing is immersed in the groove, the moisturizing oil is brought up by the rotating bearing parts, and then flows back to the oil groove. The oil level should be slightly lower than the center of the lowest rolling element.

2, dripping oil moisturizing

Drip oil moisturizing is suitable for bearing parts that need to supply moisturizing oil quantitatively. The amount of dripping oil is generally one drop per 3-8 seconds. Excessive oil quantity will cause the bearing temperature to increase.

3, circulating oil moisturizing

The filtered oil is transferred to the IKO bearing component by an oil pump, filtered and cooled by the moisturizing oil after the bearing. Since the circulating oil can take a certain amount of heat to cool the bearing, this method is suitable for bearing parts with higher rotational speed.

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Common quality defects of KOYO imported bearing parts after heat treatment

Common quality defects of KOYO imported bearing parts after heat treatment include: quenching microstructure superheat, underheating, quenching crack, insufficient hardness, heat treatment variant, surface decarburization, soft point.

Overheat

Overheating of the microstructure after quenching can be observed from the rough mouth of KOYO imported bearing parts.

However, in order to correctly judge the degree of overheating, it is necessary to observe the microstructure. If coarse needle-shaped martensite appears in the quenched structure of gcr15 steel, it is quenched and superheated. The formation may be caused by excessive heating of the quenching heating temperature or the heating temperature is too long; or it may be due to the serious banding of the original structure, forming a local martensite needle-like coarse in the low carbon zone between the two zones. Cause local overheating. The retained austenite increases in the superheated structure, and the dimensional stability decreases. Due to the overheating of the quenched structure, the crystal of the steel is coarse, which leads to a decrease in the toughness of the part and a decrease in the impact resistance. The life of the KOYO bearing is also reduced. Excessive heat can even cause quenching cracks.

2. Underheat

Low quenching temperature or poor cooling will produce a tortite structure exceeding the standard in the microstructure, called underheated structure, which will reduce the hardness and sharply reduce the wear resistance, affecting the life of KOYO bearings.

3. Quenching crack

The crack formed by KOYO imported bearing parts due to internal stress during quenching and cooling is called quenching crack. The causes of such cracks are: the heating temperature is too high due to quenching or the cooling is too fast. The thermal stress and the mass of the metal change the tissue stress greater than the fracture strength of the steel; the original defects of the working surface (such as micro cracks or scratches on the surface) or internal defects of the steel (such as slag inclusions, severe non-metallic inclusions) , white spots, shrinkage holes, etc.) stress concentration during quenching; severe surface decarburization and carbide segregation; insufficient firepower or timely tempering after quenching; excessive cold stress caused by previous processes, forged folding, deep Turning tool marks, sharp edges and corners of oil hooks.

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