Discussion on the Production Process of Yaw Bearings
Source: China Bearing Network | Date: July 24, 2013
With the rapid advancement in the machinery industry, the application of bearings has become increasingly widespread. Among them, yaw bearings represent a new type of rotational support developed by our company. These bearings require zero or negative clearance, have strict regulations on rotational damping torque, and demand high precision. Additionally, depending on the main equipment's requirements, anti-corrosion treatment is essential for the bearing surface. Addressing these challenges is crucial for the development and performance of yaw bearings. **1. Anti-Corrosion Treatment of External Surfaces** To meet the anti-corrosion requirements of yaw bearings, we employ arc spraying technology, which provides long-term protection. This method uses specialized equipment to melt, atomize, and spray corrosion-resistant metals such as pure aluminum or zinc onto the workpiece surface. A highly permeable anti-corrosive coating is then applied over the arc-sprayed layer, forming a durable composite coating. The key advantages include: - Long-lasting anti-corrosion life (up to 20 years) - Strong adhesion between the coating and the workpiece - Excellent coating quality The process includes several steps: preparation of semi-finished inner and outer rings of the bearing, pre-cleaning, workpiece pre-protection, sandblasting, arc spraying, and sealing treatment. Each stage ensures that the final product maintains high-quality anti-corrosion properties and structural integrity. **2. Damping Torque Control** The damping torque of a yaw bearing arises from two primary sources: the friction resistance of the raceway and the resistance between the seal and the sealing surface. While the latter remains relatively constant under similar conditions, the former significantly influences the overall damping effect. The friction resistance depends largely on the bearing gap. A larger gap increases resistance, while a smaller or zero gap reduces it. Since yaw bearings require zero or negative clearance, the damping torque is directly influenced by this clearance. The accuracy of the raceway before quenching plays a critical role in determining the final clearance. Four key stages are involved in the process: turning before quenching, induction hardening, grinding after quenching, and processing of the rolling elements. - **Turning Before Quenching**: High-precision CNC lathes ensure accurate shaping of the raceway. - **Induction Hardening**: Specialized machines control heat treatment parameters to achieve even hardening. - **Grinding After Quenching**: Advanced CNC grinders ensure high precision and consistency. - **Rolling Elements**: High-quality steel balls produced with micron-level accuracy contribute to overall performance. **3. Role of Arc Spraying Technology** Arc spraying not only enhances the anti-corrosion properties of the bearing but also ensures uniform coating depth and excellent coverage. This results in a bearing that meets all design specifications, including proper clearance and damping characteristics. After testing and application, the yaw bearings demonstrate excellent corrosion resistance and stable performance, proving their reliability in real-world environments. The successful development of yaw bearings has provided valuable experience in promoting technological innovation in domestic rotational supports, enhancing global competitiveness, and achieving significant economic and social benefits.
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