What are the requirements for the temperature and time of heating the inner ring when installing self-aligning roller bearings?
Release time:
2025-06-16
What are the requirements for the temperature and time of heating the inner ring when installing self-aligning roller bearings?
When installing self-aligning roller bearings, the temperature and time for heating the inner ring must strictly follow the specifications to avoid damage to the bearing or a decline in performance. The following are the specific requirements and key points for operation:
I. Heating Temperature Requirements
Temperature Range
The heating temperature of the inner ring is usually controlled between 100°C and 120°C (not exceeding 120°C).
Reason: The common material for self-aligning roller bearings is high-carbon chromium bearing steel (such as GCr15), and its tempering temperature is generally between 150°C and 250°C. Heating above 120°C may cause annealing of the inner ring, reducing its hardness and affecting its service life.
Exception: If the bearing material or heat treatment process is special (such as high-temperature alloys), the temperature should be adjusted according to the manufacturer's manual.
Prohibition of Exceeding Limits
Exceeding 120°C is strictly prohibited, as it may lead to:
Change in the microstructure of the inner ring, reducing its strength;
Change in the internal clearance of the bearing, affecting the running accuracy;
If the bearing is sealed or pre-lubricated, high temperatures may cause the lubricating grease to deteriorate and the seals to be damaged.
II. Heating Time Requirements
Factors Affecting Heating Time
The heating time depends on the inner diameter, weight, and heating method of the bearing, and it is necessary to ensure uniform heating of the inner ring. Common references are as follows:
Small-sized bearings (inner diameter < 50mm): 5 to 10 minutes;
Medium-sized bearings (inner diameter 50 to 100mm): 10 to 15 minutes;
Large-sized bearings (inner diameter > 100mm): 15 to 30 minutes.
Key Principle
The goal is to achieve the required interference fit through the expansion of the inner ring rather than adhering to a fixed time. The temperature can be confirmed as sufficient by calculating the expansion amount:
Expansion amount of the inner ring ≈ interference amount + 0.01 to 0.03mm (safety margin),
Expansion formula: ΔD = D × α × ΔT (D is the inner diameter, α is the linear expansion coefficient of steel 11 × 10⁻⁶/°C, ΔT is the temperature rise).
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