The bearing raceway refers to the rolling contact surface on the inner and outer rings of the bearing, where rolling elements (such as balls, rollers or needles) run in the raceway to achieve low-friction rotation. The accuracy, finish and hardness of the raceway directly affect the service life, running smoothness and noise level of the bearing.
🔹 High hardness: raceways are usually made of hardened steel with a hardness of HRC58-65 to ensure wear resistance.
🔹 High precision: The roundness, straightness and surface roughness of the raceways are extremely high, usually requiring Ra0.2μm or less.
🔹 High finish: Precision grinding and superfinishing ensure that the raceways are smooth and free of defects, reducing rolling element wear.
Using high-performance ceramic CBN grinding wheels for raceway grinding has the following advantages:
🔸 Efficient grinding: quickly remove material and improve processing efficiency.
🔸 High precision retention: ensure the stability of raceway dimensions and reduce errors.
🔸 Low thermal impact: ceramic binder has good heat dissipation performance and reduces the risk of workpiece burns.
🔸 Long life: CBN abrasives have high wear resistance, reduce replacement frequency and reduce costs.
| Outer Diameter (D, mm) | Bore (H, mm) | Thickness (T, mm) | Working Layer Thickness (X, mm) | Grit Size | Bond |
| 20 | 5 | 10 | 3 | B151, B126, B91 | Ceramic |
| 25 | 6 | 10 | 3 | B151, B126, B91 | Ceramic |
| 40 | 10 | 15 | 5 | B126, B91, B76 | Ceramic |
| 50 | 13 | 20 | 5-7 | B126, B91, B76 | Ceramic |
| 60 | 16 | 20 | 7-10 | B91, B76, B64 | Ceramic |
| 80 | 20 | 25 | 10 | B76, B64, B54 | Ceramic |
| 100 | 31.75 | 30 | 10-12 | B64, B54, B46 | Ceramic |
⚙ Custom sizes, bond formulations, and grit sizes available upon request to meet specific grinding requirements.
| Item | Details |
| Equipment | High-Precision CNC Grinding Machine |
| Workpiece Material | GCr15 Bearing Steel |
| Requirements | Surface Roughness: Ra ≤ 0.2μm Roundness Error: ≤ 2μm |
| Grinding Process | Grinding Wheel: Ceramic CBN Grit Size: 200# Concentration: 100% Dressing Tool: Diamond Dressing Pen |
| Grinding Steps | Rough Grinding: Removes most of the stock, leaving 0.02mm for finish grinding. Finish Grinding: Gradually reduces feed rate to achieve required surface quality and roundness. |
| Processing Results | Surface Roughness: Ra = 0.15μm (Better than required) Roundness Error: 1.5μm (Within requirement) Processing Efficiency: 30% higher than conventional wheels Wheel Lifespan: 5 times longer than conventional wheels |
| Conclusion | The ceramic CBN wheel successfully replaced conventional alumina wheels, exceeding customer expectations in efficiency and cost-effectiveness. Future improvements will focus on optimizing the dressing process to further enhance efficiency and reduce cycle time. |
📞 For more details on high-efficiency grinding solutions, contact us today!
