Bearing Heater Principle

by：JNSN 2022-04-07

Mounting Bearings by Heat

The mounting force required to mount a bearing or annular workpiece increases rapidly with bearing size. Due to the mounting force requirements, larger bearings are not easily pushed onto the shaft or into the housing. Therefore, the bearing or housing or ring workpiece needs to be heated before installation.

The principle of induction heating

Induction bearing heaters can be compared to transformers, which work by combining a primary coil with more turns and a coil with fewer turns. The secondary coil is mounted on the same iron core. The input to output voltage ratio is equal to the ratio of the turns of the coil, while the energy remains the same. Therefore, the secondary coil generates a large current under low voltage conditions. For the Yangzi tool induction heater, the bearing is a short-circuit single-turn secondary coil, which passes a large current under the condition of lower AC voltage, thus generating a large amount of heat. The heater itself and the yoke are kept at room temperature. Since this heating method induces an electric current, the bearing becomes magnetized. It is important to ensure that the bearing is demagnetized later so that it does not pick up magnetic metal chips during operation. All induction heaters have an automatic degaussing function.

Heat Mounting

The temperature difference between the bearing and where the housing is mounted depends on the interference fit class and bearing size. Normally, the bearing temperature is 80 to 90°C (144 to 162°F) higher than the shaft temperature is sufficient for installation. However, the heating temperature of the bearing must not exceed 125 ° C (257 ° F), because the metallographic transformation of the bearing material will occur at this time, resulting in a change in diameter or hardness. Local overheating must be avoided. In particular, the bearing should not be heated with an open flame. Wear clean protective gloves when installing heated bearings. Installation is facilitated by the use of a hoisting (hoisting) mechanism. Push the bearing along the shaft into the mounting position, holding the bearing in place, pushing until it is a firm fit. Yangzi Tools provides induction bearing heaters as standard with electric heating plates with adjustable thermostats, which can meet all the needs of general installations.

Why use an induction bearing heater?

Induction heating is an advanced, fast and controllable heating method. Compared with traditional heating stove heating, oil bath heating, and torch heating, it is easy to produce oil fume, waste oil and harmful to human health. Inductive heating has the advantages of safety and environmental protection.

Suitable for bearings and other parts

Induction heaters are versatile and can be used to heat ring-shaped workpieces such as bearings, gears, mechanical bushings, and couplings. It is well known that proper installation can prolong bearing life. Controlled induction heating prevents unnecessary damage and maintains original pre-lubrication, ideal for sealed bearing installations.

The heating is safe and controllable.

Bearing heaters, gear heaters, induction disassemblers, ring gear heaters, etc. are all produced on the principle of induction heating.

During the heating process, CNC components can provide optimal control, automatically select an effective power supply to ensure uniform and fast heating, no additional steps are required, no explosion occurs during the heating process, no Fading or denting of the surface of the material occurs. CNC components offer a three-year shelf life.

Reliable quality

The electric induction heaters are proven reliable and the electronic components can be used continuously thanks to the excellent cooling foil. The robust and easy-to-use design makes the heater safer and suitable for continuous operation in industrial environments.