Introduction of SKF Bearing Heat Treatment

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SKF bearing heat treatment method introduction summary

The quality of heat treatment is directly related to the quality of subsequent processing, which ultimately affects the performance of the parts. The service life of the heat treatment machinery industry is a major energy consumer and the largest polluter. In recent years, scientific and technological progress and the application of heat treatment technology in heat treatment have mainly reflected the following aspects: clean heat treatment production, waste water, exhaust dust noise Electromagnetic radiation environment causes pollution to solve heat treatment environmental pollution .

Surface coating technologies includePhysical vapor deposition (PVD), chemical vapor deposition (CVD), radio frequency sputtering (RF), ion spraying, chemical plating, etc. [38~42]. Compared with CVD, PVD has a low temperature growth of the workpiece to be processed in the process, no heat treatment is required after plating, and it is widely used in the surface treatment of SKF bearing parts. Steel bearing parts such as 100Cr6 and 440C are PVD, CVD or RF plated with TiC, TiN, TiAlN, etc., which can improve the wear resistance and contact fatigue resistance of SKF bearing parts and reduce the surface friction coefficient.

SKF has developed two coating technologies in recent yearsOne is to use PVD to coat diamond ring carbon (DLC) with extremely high hardness on the surface of bearing rings and rolling elements. The surface hardness is 40~80% higher than that of hardened bearing steel. The coefficient of friction is similar to PTFE or MoS2. It has self-lubricating properties. , And the combination with the substrate is good, no flaking, the bearing life and wear resistance are greatly improved, and it can still work normally in the case of oil cut, known as "NoWear bearing";The second is to use PSC to spray a layer of aluminum oxide with a thickness of 100μm on the outer circumferential surface of the outer ring of the bearing, so that the insulation capacity of the bearing is up to more than 1000V, and the bearing has a higher insulation capacity by increasing the thickness of the aluminum oxide. The coated aluminum oxide is firmly combined with the substrate, and can also improve the corrosion resistance of the bearing. The plated bearing can be installed like a normal bearing.

Low temperature ion sulfidation is a surface modification technology that appeared in the late 1980s.The basic principle is similar to ion nitriding. Under a certain degree of vacuum, the high-voltage direct current is used to ionize the sulfur-containing gas. The generated sulfur ions bombard the surface of the workpiece, and react with iron on the surface of the workpiece to form a sulfide with a thickness of about 10 μm mainly composed of FeS. Physical layer. Sulfide is a good solid lubricant, which effectively reduces the friction coefficient of the steel contact surface, and as the load increases, the friction coefficient is further reduced, so the wear resistance of the bearing under heavy load can be greatly improved, and the life of the SKF bearing can be increased About 3 times.