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Analysis and Prevention of bearing damage I
Mar 22, 2018

      Bearing is one of the main reasons that affect the life of the machine, and it is also the main reason that affects the performance and transmission efficiency of the machine. The stability and reliability of the bearing directly determine the reliability of the whole machine. Therefore, the high-end bearing market has been mainly monopolized by foreign enterprises for a long time, and the domestic bearing manufacturers are mainly concentrated in the middle and low end markets. In recent years, with the continuous improvement of domestic processing equipment and manufacturing level and the introduction of high-end talents, some breakthroughs have been made in the design and manufacturing level of high-end bearings, and some achievements have been made in the high-end market. In order to improve the production and processing level of domestic bearings, it is very important to analyze the bearing damage and prevent the damages.

The classification and characteristics of bearings

    According to different friction properties of bearings, bearings can be divided into two categories: sliding friction bearings (abbreviated as sliding bearings) and rolling friction bearings (abbreviated as rolling bearings). Rolling bearings are supported by rolling contact between the main components, because of the small friction coefficient, small starting resistance, low power consumption, easy maintenance and lubrication, it is widely used in general machines. Sliding bearings can be used in other working conditions, such as high working speed, extraordinary impact and vibration, limited radial size, split installation (such as crankshaft bearings) and working in water or corrosive media. Therefore, sliding bearings are widely used in rolling mills, steam turbines and other instruments.

     Rolling bearings can be divided into three types: radial bearing, thrust bearing and radial thrust bearing. Radial bearing mainly bears radial load; thrust bearing can only bear axial load, and radial thrust bearing can bear both axial load and radial load.

Composition of Rolling bearings and Heat treatment of Materials

    The basic structure of rolling bearing consists of four parts: bearing inner ring, bearing outer ring, bearing rolling body and cage. The inner ring is used to fit the journal and the outer ring is used for the bearing seat. The rolling body rolls between the inner and outer raceways. The main function of the cage is to separate the rolling body evenly. The inner and outer rings and rolling bodies of bearings are generally made of bearing steel, and the hardness after heat treatment is generally not less than 60 HRC. Because these elements of the general bearing are tempered at 150 ℃, the hardness of the element will not decrease when the working temperature of the bearing is not higher than 120 ℃.