Reasons for Fracture of Imported Bearing Cage and Factors Affecting Bearing Performance
Bearings play an important role in social life. Bearings are composed of cages, outer rings, rolling elements and inner rings. Different bearing types have different bearing components. What are the reasons for the fracture of imported bearing cages?
Creep phenomenon is also one of the reasons for the fracture of the cage. The sliding phenomenon of the so-called creep multi-finger ferrule, when the interference of the mating surface is insufficient, the load point moves to the peripheral direction due to sliding, resulting in the phenomenon that the ferrule is deviated in the circumferential direction relative to the shaft or housing. Once creep occurs, the mating surface wears significantly, and the wear powder may enter the inside of the bearing, resulting in abnormal wear, peeling of the raceway, cage wear and additional load, which may cause the cage to break.
Cage abnormal load. If the installation is not in place, inclined, and the amount of interference is too large, the clearance will be reduced, the friction and heat generation will be aggravated, the surface will soften, and abnormal peeling will occur prematurely. The operation of the cage is blocked and additional load is generated, which aggravates the wear of the cage, and such a worsened cycle may cause the cage to break.
Cage material defects and riveting defects may cause the cage to break. Countermeasures are taken to strictly control the manufacturing process. The intrusion of foreign objects is a common mode of cage fracture failure. Due to the intrusion of foreign hard foreign matter, the wear of the cage is aggravated and abnormal additional load is generated, which may also cause the cage to break.
Poor lubrication mainly means that the bearing is running in a state of lean oil, which is easy to form adhesive wear, which deteriorates the working surface condition.
Bearings play an important role in the field of machinery. The feeling of bearings to me is that bearings can not only be used in machinery, but also can be made into some craft toys. Bearings have a significant impact on our lives.
What are the factors that affect the bearing performance? The following analysis. The smelting quality and basic requirements of bearing steel The service life and reliability of rolling bearings are closely related to the smelting quality of bearing steel to a large extent. Bearing steel smelting requirements are much stricter than general industrial steel.
High-precision dimensional requirements Steel for rolling bearings requires high dimensional accuracy, because most bearing parts are pressure formed. In order to save materials and improve labor productivity, most of the bearing rings are formed by forging, the steel balls are formed by cold heading or hot rolling, and the small-sized rollers are also formed by cold heading. If the dimensional accuracy of the steel is not high, the blanking size and weight cannot be accurately calculated, and the product quality of the bearing parts cannot be guaranteed, and it is easy to cause damage to the equipment and molds.
Particularly strict carbide inhomogeneity requirements In bearing steel, if there is serious carbide distribution inhomogeneity, it is easy to cause inhomogeneity in structure and hardness during the heat treatment process. have a greater impact. In addition, severe carbide inhomogeneity is also easy to cause cracks in bearing parts during quenching and cooling, and carbide inhomogeneity will also reduce the life of the bearing. Therefore, in the bearing material standard, there are clear specifications for different specifications of steel. special requirement.
Strict chemical composition requirements The general bearing steel is mainly high carbon chromium bearing steel, that is, a hypereutectoid steel with a carbon content of about 1%, adding about 1.5% chromium, and a small amount of manganese and silicon elements. Chromium can improve heat treatment performance, hardenability, structure uniformity, tempering stability, and can improve the rust resistance and grinding performance of steel. However, when the chromium content exceeds 1.65%, the retained austenite in the steel will increase after quenching, reduce the hardness and dimensional stability, increase the inhomogeneity of carbides, and reduce the impact toughness and fatigue strength of the steel. For this reason, the chromium content in high carbon chromium bearing steel is generally controlled below 1.65%. Only by strictly controlling the chemical composition of the bearing steel, can the structure and hardness that meet the bearing performance be obtained through the heat treatment process.
Specially strict surface defect and internal defect requirements For bearing steel, surface defects include cracks, slag inclusions, burrs, scarring, oxide scale, etc., and internal defects include shrinkage cavities, bubbles, white spots, severe porosity and segregation. These defects have a great impact on the processing of the bearing, the performance and life of the bearing, and it is clearly stipulated in the bearing material standard that these defects are not allowed.
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