The advantages of preheating rotary bearing: 1. It can make the stability and uniformity of rotary bearing better. Because the preheating transformation is a relatively slow process, generally speaking, the BL transformation of the rotary bearing is about 4 hours, and the surface structure transformation is almost simultaneous, so if the preheating can make the hardness stability and uniformity of the rotary bearing, the grinding cracks of the rotary bearing can be reduced. In the production of turntable bearings, because of the large size and heavy weight of rings, brittleness will be greater when quenching. In order to ensure the quality of quenching, strong cooling measures will be adopted, which may lead to quenching micro-cracks. The preheated structure is much tougher than the M structure, and the surface can form a pressure change of - 400 - 500 MPa, which can greatly reduce the appearance of quenching grain. Improve the service life of rotary bearing. For turntable bearings with large load-bearing in mechanical parts, the wear and tear is more serious in use, so the toughness of the bearings treated by isothermal quenching will be better, and the service life of the pre-heat-treated turntable bearings will be greatly improved. Rotary bearings require mounting holes and internal gears, external gears,
Lubrication holes, etc., these structures work compactly, light weight, smooth operation. Slewing bearings are more durable than other bearings because they are larger in size and have diameters ranging from 0.4 to 10 meters, which directly exceed 40 meters. Rotary bearings usually bear several loads, so high quality lubricants should be used. Rotary support plays a very important role in the operation of grader, roller and excavator. It can also be used in concrete machinery, feeding machinery, lifting machinery and so on. High quality rotary bearing needs to use carbon chromium bearing steel hardened as a whole, and ring of rotary bearing adopts hardened steel. If customers do not have special requirements, it can be produced according to conventional production. But in order to meet the application of some special places, customers can provide specific production conditions. The sealing ring of slewing bearing needs to be made of oil-resistant butadiene-eye rubber. The material and blank of the ring need to be selected according to the regulations. Slewing bearing
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