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The rolling bearing heating method is commonly used when the inner diameter of the bearing is larger than 70mm or when there's a significant interference fit. This technique helps expand the bearing bore, making installation easier and preventing damage caused by excessive force. Proper temperature control is crucial—typically, bearings are heated to around 80°C to 100°C. Exceeding 120°C may cause tempering, reducing the hardness and precision of the raceway.
Here are some common heating methods:
1. **Electric Hot Plate Method**
Place the bearing on a hot plate set at approximately 100°C for a few minutes. This method is fast and efficient, especially for large bearings. Rotating the bearing ensures even heating and better results.
2. **Electric Furnace Method**
Bearings are placed in a closed electric furnace with precise temperature control. This method provides uniform heating and is ideal for batch processing.
3. **Induction Heating Method**
Induction heaters can quickly and cleanly heat the bearing to the desired temperature. This method is particularly effective for tight fits, as it heats only the inner ring, making installation on the shaft easier and more precise.
4. **Bulb Heating Method**
A 50W bulb is used to heat the bearing. Smaller bearings can be placed directly on the bulb, while larger ones can be placed inside a cone-shaped reflector to prevent heat loss. The cone can be adjusted to accommodate different sizes. Using an infrared bulb is energy-efficient, but care should be taken to position it correctly to avoid eye exposure. This method is suitable for small-scale or occasional use.
5. **Oil Tank Heating Method**
One of the most traditional methods, oil tank heating involves placing the bearing on a metal mesh inside a container filled with oil. The oil should be clean and non-corrosive, preferably transformer oil. Bearings should not be placed directly on the bottom of the tank to avoid overheating or contamination. The oil level and container size should be chosen based on the bearing size and quantity.
Key points to consider when using any heating method include:
- Maintaining the correct temperature to avoid damage or insufficient expansion.
- Heating quickly to prevent cooling before installation.
- Applying pressure after cooling to ensure proper seating of the inner ring.
- Checking for gaps between the inner ring and the shaft shoulder using a feeler gauge.
This method not only improves efficiency but also enhances the performance and lifespan of the bearing.
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Rolling bearing heating device method
**Rolling Bearing Heating Method**
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Source: China Bearing Network | Time: 2013-03-21