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Sep 13 2022
What Are the Factors That Need to Be Considered in the Selection of Slewing Bearings?
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The structural forms commonly used in turntable bearings include single-row, double-row four-point contact ball turntable bearings, double-row angular contact thrust ball turntable bearings, crossed cylindrical roller and crossed tapered roller turntable bearings, three-row cylindrical roller turntable bearings, ball and roller combined turntable bearings, and other different structural forms. Although the structural forms are different, the materials used are similar, and the materials of the turntable bearings directly determine the performance and service life of the bearings. Today, let's take a look at what materials are used in turntable bearings.
As bearings should have characteristics such as long life, high precision, low heat generation, high speed, high rigidity, low noise, and high wear resistance, the bearing steel requires high hardness, uniform hardness, high elasticity, and high limit. Generally, the rolling elements of turntable bearings use carbon-chromium bearing steel that is integrally quenched and hardened. The turntable bearing rings use surface hardened steel, and we generally use 50Mn or 42CrMo. When there are no special requirements from customers, steel is generally used, but sometimes, in order to meet the needs of the main engine in some special application scenarios, other types of surface-hardened steel can also be selected according to the specific usage conditions provided by customers.
The cages of turntable bearings have structural forms such as integral, segmented, and isolation block. Among them, the integral and segmented cages are made of steel or cast aluminum alloy. The isolation block type is made of polyamide resin, cast aluminum alloy, and so on.
The materials for turntable bearing seal rings are made of oil-resistant rubber or nitrile rubber. The material and blank supply status codes for the ring are specified in the table. "T" indicates that the blank for the ring is supplied in a quenched and tempered state, while "Z" indicates that the blank for the ring is supplied in a normalized state. Hydrogenated nitrile rubber has superior oil resistance compared to nitrile rubber, but if the requirements for oil resistance are not too strict, nitrile rubber can be used because hydrogenated nitrile rubber is relatively expensive. Nitrile rubber also has certain acid and alkali resistance. However, for higher requirements for oil and acid-alkaline resistance, silicone rubber should be chosen, but its price is higher.
In summary, knowing the materials used in industrial turntable bearings and their main bodies and parts is relevant. The main body is made of metal materials, while other components, such as sealing rings, are made of rubber. When purchasing these bearings, you must pay attention to the integrity of these materials to ensure high-quality performance during operation. SWBTEC provides high-quality and high-performance turntable bearing products for the market customers.
