Requirements For Bearing Thermal Disassembly

As a company specializing in bearing heating installation and disassembly, the following explains the necessary conditions for bearing disassembly based on the common needs of our customers.

Before discussing bearing heating installation and disassembly, let's first review the principles of installation and disassembly. Heaters operate similarly to transformers. The heater serves as the primary coil, while the workpiece to be heated acts as the secondary coil. When the heater is activated, high-voltage low alternating current passes through the primary coil (heater) with multiple turns, generating a low-voltage high current inside the workpiece to be heated. This makes the workpiece a secondary coil, and the high current flowing through it causes heating. The heated workpiece expands thermally, increasing in size, allowing it to be mounted on the shaft. Upon cooling, it contracts and fixes onto the shaft. Therefore, the inner ring of the bearing is heated during installation. Similarly, during disassembly, the inner ring must be heated, and the bearing can only be removed when the inner ring is hot while the shaft remains cool.

Many people want to heat an intact bearing to remove it from the shaft. For bearings with separable inner and outer rings, the outer ring and rolling elements should be removed first, and then the inner ring must be heated to a specific temperature within a short time to facilitate disassembly. However, most bearings have non-separable inner and outer rings. If such bearings need to be disassembled intact, using a puller to remove them directly will damage the shaft, making this method unsuitable for precision equipment. If thermal disassembly is desired, the outer ring must be broken first, followed by removing the cage and rolling elements. Then, an intermediate frequency winding device is used to wrap around the outer wall of the inner ring, which is heated before removal.

Finally, it should be noted that for bearings with non-separable inner and outer rings, thermal disassembly is currently impossible without breaking the bearing under the existing technological level.