Cooling control method for bearing steel balls

Abstract

The invention relates to a cooling control method for bearing steel balls. The bearing steel balls are immediately put into a normalizing liquid in a cooling pool to be cooled after being forged, theconcentration and temperature of the normalizing liquid are controlled, and the marching speed of chain plates used for conveying the bearing steel balls is adjusted simultaneously; and the bearing steel balls are cooled at the cooling speed of 2.5 DEG C / S to 3 DEG C / S, the temperature of the bearing steel balls is monitored, the normalizing liquid is lifted out when the bearing steel balls are cooled to 600 DEG C to 750 DEG C, and the bearing steel balls are cooled through sprays. According to the cooling control method for the bearing steel balls, the tempering-resisting stability of products is significantly improved, impact toughness is greatly improved, and the contact fatigue life is greatly prolonged; and meanwhile, the uniformity and consistency of internal structures of the products are improved, and the level of network carbides can be controlled to be below level 2.

Description

technical field [0001] The invention relates to the field of production and manufacture of bearing steel products, in particular to a cooling control method for bearing steel balls. Background technique [0002] Wind power is a renewable clean energy. The country is vigorously promoting its application and gradually increasing the proportion of clean energy in total energy consumption. According to relevant data, the annual installed capacity in the world is about 30GW. At present, the power of commonly used wind turbines is 1.0-6.0MW, which can be divided into two types: onshore and offshore wind turbines. Maintenance-free within the design life of 20 years. Among them, the yaw bearing and the pitch bearing are the key components in the wind turbine. They work under harsh working conditions and must bear a large overturning moment. The rolling elements in the bearings---the bearing steel balls are the key. To ensure the consistency of steel ball performance, the uniformit...

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Problems solved by technology

Although the existing production technology also adopts strong cooling methods such as blast cooling and spray cooling, it is still difficult to cool the steel ball quickly if the size of the steel ball is large, because its shape is solid, and it is difficult to cool the steel ball quickly To the temperature where no reticular carbides are precipitated, in summer production due to high ambient temperature and slower cooling speed, the reticulated carbide index often exceeds the standard (greater than 2.5 grades), and it is impossible to produce high-reliability bearing steel ball blanks for wind power bearings

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