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Fracture reason of imported bearing cage and factors affecting bearing performance
Aug 12, 2018

Bearing plays an important role in social life. Bearing is composed of retainer, outer ring, rolling body and inner ring. Different types of bearing have different components of the bearing.

Creep phenomenon is also one of the reasons for the fracture of the retainer. The so-called creep refers to the sliding phenomenon of the ring. In the case of insufficient interference of the mating surface, the load point moves towards the surrounding direction due to sliding, resulting in the deviation of the ring relative to the axis or the shell towards the circumference direction. Once creep occurs, there is significant wear on the mating surface, and the worn powder may enter the bearing and form abnormal wear, raceway spalling, wear on the cage and additional loads, which may cause the cage to break.

Abnormal load on the cage. Such as the installation does not reach the designated position, slope, etc of the large amount of interference of the clearance is reduced, increasing friction heat production, the surface of the softening, abnormal early spalling, along with the expansion of peeling, flaking foreign body into the cage pocket hole, lead to keep running block and generate additional load, aggravated the wear and tear in the cage, the cycle of so worse, may cause maintains a fracture.

The material defects and riveting defects may cause breakage of the holder. Countermeasures are taken for strict control in the manufacturing process. The invasion of foreign body is a common mode of failure of retainer frame. Due to the invasion of foreign hard foreign matter, the wear of the cage is intensified and abnormal additional loads are generated.

Bad lubrication mainly refers to the bearing running in the state of poor oil, easy to form adhesive wear, which worsens the working surface state, and the tear produced by adhesive wear is easy to enter the holding frame, which produces abnormal load and may cause the maintenance frame to break.

Bearing plays an important role in the field of machinery. The sense of bearing to me is that bearing can not only be applied to machinery, but also be made into some craft toys. Bearing has a significant impact on our life.

What factors affect bearing performance? Analysis follows. The metallurgical quality of bearing steel and the basic requirements of rolling bearing service life and reliability are closely related to the metallurgical quality of bearing steel to a great extent. The requirement of smelting bearing steel is much stricter than that of industrial steel.

High precision dimensions require high precision steel for rolling bearings because most bearing parts are pressure molded. In order to save material and improve labor productivity, most bearing rings are forged and formed, steel balls are formed by cold heading or hot rolling, and small size rollers are also formed by cold heading. If the size accuracy of steel is not high, it is impossible to calculate the size and weight of the material accurately, and the product quality of bearing parts cannot be guaranteed, and it is easy to cause damage to equipment and molds.

Especially strict carbide unevenness is required in bearing steel. If serious unevenness of carbide distribution is found, it will easily cause the unevenness of structure and hardness in the heat treatment process. In addition, severe carbide unevenness can easily lead to cracks in bearing parts during quenching and cooling, and carbide unevenness can also lead to reduced bearing life. Therefore, in the bearing material standard, there are specific requirements for steel of different specifications.

Strict chemical composition requirements for general bearing steel is mainly high-carbon chromium bearing steel, that is, carbon content of about 1%, adding 1. About 5% chromium, and contains a small amount of manganese, silicon in the hypereutectic steel. Chromium can improve heat treatment performance, quenching, microstructure uniformity, tempering stability, and also improve rust resistance and grinding performance of steel. But when the chromium content exceeds 1. At 65%, after quenching, the retained austenite in the steel will be increased, the hardness and dimensional stability will be reduced, the unevenness of carbide will be increased, and the impact toughness and fatigue strength of the steel will be reduced. For this reason, the content of chromium in high-carbon chromium bearing steel is generally controlled below 1,65%. Only by strictly controlling the chemical composition of bearing steel can the structure and hardness of bearing properties be obtained through the heat treatment process.

Particularly strict requirements for surface defects and internal defects for bearing steel, surface defects include cracks, slag inclusion, burrs, scarring, oxide skin, etc. Internal defects include shrinkage cavity, bubble, white spot, severe porosity and segregation, etc. These defects have a great impact on the processing of the bearing, the performance and life of the bearing.