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When mounting bearings or annular components of a bearing device, heating is often necessary to ensure smooth installation. This is especially true for larger bearings that are difficult to fit onto the shaft or into the housing due to tight tolerances. Proper heating ensures that the bearing expands enough to be easily mounted without causing damage.
The principle behind induction heating is similar to that of a transformer. It involves a primary coil with many turns and a secondary coil with fewer turns, both wound around a common core. The voltage ratio between the primary and secondary coils corresponds to the number of turns, while the energy remains constant. As a result, the secondary coil generates a high current under low voltage, which produces significant heat.
In the case of an induction bearing heater, the bearing acts as a single-turn secondary coil. When a large current passes through it at a lower voltage, the bearing heats up quickly. The heater itself and its yoke remain at normal temperature. However, this process can magnetize the bearing, so it's essential to demagnetize it afterward to prevent it from attracting metal particles during operation. Most induction heaters come with a built-in degaussing function.
The temperature difference between the bearing and the housing depends on the interference fit and the size of the bearing. Normally, the bearing should be heated to 80–90°C (144–162°F) higher than the shaft. However, the maximum allowable temperature is 125°C (257°F), as exceeding this can cause metallurgical changes in the bearing material, affecting its dimensions or hardness. Care must be taken to avoid overheating, and open flames should never be used. Always wear protective gloves when handling heated bearings, and use lifting equipment to safely mount them. Push the bearing along the axis until it fits snugly.
Yangzi Induction Heaters feature adjustable thermostats on their hot plates, making them suitable for most standard applications. They provide efficient and controlled heating, ensuring safety and performance.
Why Use an Induction Bearing Heater?
Induction heating is a fast, precise, and modern method compared to traditional techniques like oil baths, torches, or electric stoves. It eliminates harmful emissions, oil residues, and risks to human health. It is environmentally friendly, safe, and highly effective.
These heaters are widely used for various parts such as bearings, gears, bushings, and connectors. Proper heating can significantly extend the life of bearings. Controlled induction heating prevents unnecessary damage and maintains the original surface finish, making it ideal for sealed bearing systems.
Safe and Controllable Heating
Bearing heaters, gear heaters, induction disassemblers, and ring gear heaters all operate on the principle of induction heating. CNC components allow for optimized control, ensuring even heating and faster results. There’s no need for complex processes, and no risk of burning or warping occurs. CNC parts have a three-year shelf life and are easy to maintain.
Quality-assured electric induction heaters are durable, equipped with cooling fins, and designed for long-term use. They are user-friendly, safe, and suitable for continuous industrial operations.
Advantages of Electric Induction Heaters:
1. Suitable for industrial environments.
2. Microelectronic controls prevent overheating and explosions.
3. Easy-to-use rotating arm design.
4. Electronic components have a three-year shelf life.
5. Free repair service available.
6. Ideal for continuous operation.
7. Active demagnetization function.
8. Power conditioning for stable output.
9. Wide range of sizes available.
10. Meets IEC (International Electrotechnical Commission) standards.
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Bearing heater principle
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*Created on 2018/5/16*
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Source: Bearing Network | Time: 2013-04-07