How to Extend the Service Life of Forged Shafts

Extending the life of forged shafts hinges on optimizing the entire process, from materials and manufacturing to maintenance.

1. Material and Process Optimization are Fundamental
Selecting high-purity bearing steel (such as SNB16) and using micro-forging technology to refine grain size, break up, and evenly distribute inclusions can significantly improve fatigue strength and wear resistance. Precise heat treatment (such as controlling the quenching temperature between 830~850℃) can optimize the internal structure and reduce stress concentration.

2. Precision Machining and Surface Strengthening are Key
Employing ultra-precision grinding or polishing processes to achieve a surface roughness of ≤0.05μm reduces subsurface shear stress and delays fatigue spalling. Surface hardening treatments such as nitriding and carburizing create a high-hardness surface layer (HV≥700), effectively improving wear and corrosion resistance.

3. Scientific Use and Maintenance Management are Guarantees
Selecting the appropriate lubricant based on operating conditions (such as polyurea grease for high-temperature environments) ensures an oil film thickness of ≥0.1μm, preventing direct metal-to-metal contact. Strictly controlling operating loads (recommended not to exceed 80% of the rated load) and speeds, and regularly checking lubrication status and replacing lubricants are crucial. In corrosive environments, prioritize the use of sealed or coated bearings to block corrosive media.

By implementing these measures, the service life of forged shafts can be systematically extended, reducing the total life cycle cost of equipment.