KOYO Bearing Heating Method And Installation Points

When the inner diameter of the KOYO bearing is greater than 70mm, or the fit interference is large, the heating method is used to expand the KOYO bearing hole, which saves labor and time during installation and avoids damage caused by excessive force.

What needs to be controlled at this time is the heating temperature. Generally, KOYO bearings are heated to 80°C, with a maximum of 100°C. enough. Exceeding 120℃ will cause tempering of KOYO bearings, resulting in reduced hardness and reduced accuracy of the ferrules.

1. Commonly used heating methods are:
2. Electric hot plate heating method:

Place the KOYO bearing on an electric hot plate with a temperature of 100°C for a few minutes. This method is the simplest. If you turn it over several times, the KOYO bearing can be heated evenly, and the efficiency is high. This method can be used for both large and small KOYO bearings.

2. Electric furnace heating method:

Place the KOYO bearings in a closed automatic temperature-controlled electric furnace for heating. The heating is even, the temperature control is accurate, and the heating is fast. It is suitable for heating many KOYO bearings in one batch.

3. Induction heating method:

The induction heater can be used to quickly, reliably and cleanly heat the KOYO bearing to the required temperature. This is especially suitable for occasions where the inner ring is tightly fitted. Since only the inner ring is heated, and the outer ring is rarely heated, this can be done more efficiently. Easy to install on the shaft and into the seat hole.

4. Light bulb heating method:

Use a 50W light bulb to heat the KOYO bearings to ensure that the heating temperature is around 100°C. The smaller KOYO bearings can be placed directly on the bulb, and the larger KOYO bearings can be placed in the conical cover of the bulb. The conical cover can prevent the heat loss of the bulb. and make heating even. The conical cover can be adjusted up and down, and can be adapted to heat KOYO bearings of different sizes within a certain range. If a far-infrared bulb is used, pay attention to the direction of the bulb downward to prevent infrared rays from being harmful to human eyes. Imported pump bulbs can save energy. The bulb heating method is suitable for small quantities and infrequent needs; when it is necessary to heat KOYO bearings, the bulb can also be used for lighting, and no other equipment is required.

5. Oil tank heating method:

This is a widely used traditional heating method. A metal mesh is set 50 to 70mm away from the bottom of the oil tank. The KOYO bearings are placed on the mesh. Large KOYO bearings need to be lifted with hooks. KOYO bearings should not be placed directly on the bottom of the tank to prevent the parts of the KOYO bearing that contact the bottom of the tank from being overheated, or the dirt settled at the bottom of the tank to enter the KOYO bearing. The key points to note when using the oil tank heating method are as follows. Non-corrosive mineral oil with good thermal stability should be used, preferably transformer oil. Both the oil and the container should be kept clean. The capacity of the oil tank should be determined by the size of the heated KOYO bearing and the amount of oil. If the container is too small, during continuous operation, the oil temperature will drop quickly as soon as the KOYO bearing is put in, and the effect will not be good.

2. Key points of heating installation method:

① The heating temperature must be properly controlled. If the temperature is too high, the KOYO bearing will be damaged. If the temperature is too low, the expansion of the ferrule will be insufficient and the effect will not be significant. The thermal expansion of the inner ring diameter obtained by heating at a temperature of 80 to 1000°C is sufficient for KOYO bearings with general interference.

② Once the required heating temperature is reached, installation must be carried out as soon as possible to avoid installation difficulties caused by cooling.

③KOYO bearings also shrink in the width direction when cooling. Therefore, a certain amount of pressure must be applied to compress the inner ring to the shoulder during installation. After cooling, a very thin feeler gauge is used to test whether the inner ring end face and the shaft shoulder are in contact with each other. There is a gap between. In short, the operation requires skill, speed and accuracy.