The installation force required to install precision bearings or annular workpieces tends to increase rapidly as the bearing size increases. Because of the installation force requirements, larger precision bearings are difficult to push onto the shaft or into the bearing seat. Especially when the inner diameter of the precision bearing is greater than 70mm or the interference fit is large, the precision bearing, bearing seat and annular workpiece need to be heated before installation. Using the principle of thermal expansion and contraction, the heating method is used to expand the precision bearing hole. This not only saves effort and time during installation, but also avoids damage caused by excessive force. Under normal circumstances, when using oil bath heating or electric induction heating methods, the heating temperature of standard bearings should not be higher than 100℃, and that of high-speed bearings should not be higher than 150℃.

1. Electric heating plate heating method

Put the precision bearing on a hot plate at a temperature of 100℃ for a few minutes. This method is relatively simple. Flipping it several times can make the precision bearing heat evenly and at the same time have high efficiency. This method can also be used for large and small joint bearings.

2. Electric furnace heating method

Place the precision bearing in a closed automatic temperature-controlled electric furnace for heating. This method heats evenly, controls the temperature accurately, and heats quickly. It is suitable for heating more precision bearings at one time.

3. Induction heating method
match uses an induction heater to quickly, stably and neatly heat the joint bearing to the required temperature. It is especially suitable for situations where the inner ring is tightly fitted, because only the inner ring is heated, and the outer ring is not heated enough. In this way, it can be installed on the shaft and easily installed in the seat hole.

4. Light bulb heating method
match uses a 50W light bulb to heat the bearing, which can ensure that the heating temperature is around 100℃. Smaller precision bearings can be placed directly on the bulb, and larger precision bearings can be placed in the conical cover of the bulb. The conical cover can also prevent the heat loss of the bulb. At the same time, the heating is uniform and the conical cover can be adjusted up and down.

This method can be adapted to heating precision bearings of different sizes within a certain range. If a far-infrared bulb is used, it is also necessary to pay attention to the direction of the bulb should be downward to prevent infrared rays from affecting the human eye. The bulb heating method is suitable for occasions where the bearing needs to be heated infrequently and in small quantities. The bulb can also be used as a lighting device on weekdays. No other equipment is required.

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