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Rolling bearing heating device method
**Rolling Bearing Heating Methods**
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**Rolling Bearing Heating Method**
When the inner diameter of a bearing exceeds 70mm or when there is significant interference fit, the heating method is commonly used to expand the bearing bore. This technique saves time and effort, while also preventing damage that may result from excessive force.
Controlling the heating temperature is crucial. Typically, bearings are heated to around 80°C, with a maximum of 100°C being sufficient. Temperatures above 120°C can cause tempering of the bearing, which reduces the hardness and accuracy of the raceway.
Here are the most commonly used heating methods:
1. **Electric Hot Plate Method**
Place the bearing on a hot plate set to 100°C for a few minutes. This method is quick and efficient. If rotated several times, the bearing can be evenly heated. It is suitable for large bearings due to its high power output.
2. **Electric Furnace Method**
Bearings are placed in a closed electric furnace with active temperature control. This ensures even heating and precise temperature regulation, making it ideal for batch heating of multiple bearings.
3. **Induction Heating Method**
An induction heater can quickly and cleanly heat the bearing to the desired temperature. This method is especially suitable for tight fits where only the inner ring needs to be heated, minimizing heat exposure to the outer ring. This makes installation on the shaft and fitting into the housing easier.
4. **Bulb Heating Method**
A 50W bulb can be used to heat the bearing, aiming for a temperature around 100°C. Smaller bearings can be placed directly on the bulb, while larger ones can be placed in the cone of the bulb to prevent heat loss. The cone can be adjusted vertically to accommodate different sizes. Using a far-infrared bulb is more energy-efficient, but the direction should be downward to avoid eye strain. This method is best suited for small quantities and occasional use, as no additional equipment is required.
5. **Oil Tank Heating Method**
This is a traditional and widely used method. A metal mesh is placed 50–70 mm above the bottom of the oil tank, and the bearing is placed on the mesh. Larger bearings should be suspended with a hook to avoid direct contact with the tank’s bottom. Avoid placing the bearing directly on the bottom to prevent overheating or contamination from sediment. Use mineral oil with good thermal stability, such as transformer oil, and keep the oil and container clean. The oil tank size should be appropriate for the bearing size and quantity.
**Key Points of the Heating Method**
- Proper temperature control is essential. Too high a temperature can damage the bearing, while too low will not provide enough expansion.
- Once the desired temperature is reached, the bearing should be installed immediately to avoid cooling and difficulty in fitting.
- When cooling, the bearing shrinks in width, so a certain amount of pressure must be applied to push the inner ring against the shaft shoulder. After cooling, check with a thin feeler gauge to ensure there is a gap between the inner ring end face and the shaft shoulder.
This method requires precision, speed, and attention to detail.
**Related Bearing Knowledge**
Correct installation of NSK bearings can enhance their performance and lifespan. Permanent magnet type bearingless motor decoupling control strategies, bearing demand standards, basic requirements for bearing steel quality, and NSK bearing noise issues are all important topics in bearing technology.
This article is sourced from China Bearing Network. Please visit [http://www.chinabearing.net](http://www.chinabearing.net) for more information.
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