Analysis of rolling bearing heating device method

**Analysis of Rolling Bearing Heating Methods** Home > Bearing Knowledge > Analysis of Rolling Bearing Heating Device Method Source: Bearing Network | Time: May 18, 2014 When the inner diameter of a bearing exceeds 70mm or when there is a significant interference fit, the heating method is commonly used to expand the bore of the bearing. This technique not only saves time and labor but also prevents damage caused by excessive force during installation. It is crucial to control the heating temperature properly. Typically, bearings are heated to around 80°C, with a maximum of 100°C being sufficient. Exceeding 120°C may cause tempering of the bearing, leading to a reduction in hardness and dimensional accuracy. There are several common methods for heating rolling bearings: 1. **Heating Plate Method** The bearing is placed on a hot plate set at 100°C for a few minutes. This is a quick and efficient method, especially suitable for larger bearings. Turning the bearing over several times ensures even heating. 2. **Electric Furnace Method** Bearings are placed inside an electric furnace with precise temperature control. This method allows for uniform heating and is ideal for batch processing of multiple bearings. 3. **Induction Heating Method** An induction heater quickly and cleanly heats the bearing to the desired temperature. It is particularly suitable for tight fits on the inner ring, as only the inner ring is heated, while the outer ring remains cool. This makes it easier to mount the bearing on the shaft and fit it into the housing. 4. **Bulb Heating Method** A 50W light bulb can be used to heat the bearing. Smaller bearings can be placed directly on the bulb, while larger ones can be positioned inside a cone-shaped reflector to prevent heat loss and ensure even heating. If using an infrared bulb, the direction should be downward to avoid direct exposure to the eyes. This method is convenient for small quantities and does not require additional equipment. 5. **Oil Tank Heating Method** This is a traditional and widely used method. A metal mesh is placed 50–70 mm from the bottom of the oil tank, and the bearing is placed on it. Larger bearings should be suspended with a hook to avoid direct contact with the tank’s bottom. Using clean, non-corrosive mineral oil, such as transformer oil, is essential to prevent damage. The oil tank should be sized appropriately based on the number and size of the bearings being heated. Key points to consider when heating bearings include: - **Temperature Control**: Too high a temperature can damage the bearing, while too low a temperature may not result in sufficient expansion. - **Quick Installation**: Once the bearing reaches the desired temperature, it should be installed immediately to avoid cooling and difficulty in mounting. - **Pressure Application**: When cooling, apply pressure to press the inner ring against the shaft shoulder. After cooling, check with a thin feeler gauge to ensure there is no gap between the inner ring and the shaft shoulder. By following these methods and precautions, you can ensure safe and effective bearing installation, reducing the risk of damage and improving performance. Recommended Articles: - Slewing Bearing Installation and Disassembly Method - Different Types of Imported Bearing Dismantling Techniques - Deep Groove Ball Bearing Features - Timken Bearing Solutions in Cement Industry This article is linked to http:// Please indicate China Bearing Network http:// Previous: Analysis of Several Grinding Marks Reflected by Bearings During the Grinding Process Next: FAG Bearing Overview and Usage Scale

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