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Technical Features and Specifications
Slewing ring blanks must balance high surface hardness with a core tough enough to handle eccentric loading.
| Feature | Detail |
|---|---|
| Process | Seamless Rolled Ring Forging. |
| Material | 42CrMo4, 50Mn (High carbon alloys). |
| Dimensions | Diameters up to 5000mm+. |
These rings are forged to near-net shape, including the internal or external "gear teeth" profile if required. This minimizes the amount of high-alloy steel that must be machined away. The rolling process refines the microstructure, ensuring that when the bearing race is induction-hardened, the hardened layer is uniform and free of soft spots.
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Buying Tips for Heavy Rotation
- Hardness Gradient: Specify the required core hardness and hardenability (H-Band) to ensure the ring responds correctly to your final heat treatment.
- Circular Tolerance: Request high circularity to minimize the machining allowance needed on your CNC lathes.
- NDE Standards: For wind energy or medical scanners, specify the highest level of Ultrasonic Testing (UT) to ensure zero internal defects.
Advantages of Rolled Ring Blanks
| Advantage | Operational Benefit |
|---|---|
| Tangential Strength | Best resistance to the "opening" forces of large-diameter bearings. |
| Grain Refinement | Allows for a mirror-finish on the bearing race, reducing friction. |
| Material Yield | Much more cost-effective than cutting rings from a massive forged plate. |
Primary Applications
| Industry | Usage Context |
|---|---|
| Wind Energy | Pitch and yaw bearings for turbine blades and nacelles. |
| Heavy Construction | Main turntable for excavators and mobile cranes. |
| Medical | Large-diameter bearings for CT and MRI scanners. |
- Q: Why is 42CrMo used for slewing rings?
- A: It provides excellent "deep hardenability," meaning the bearing race can be hardened to a significant depth to handle high rolling contact stress.
