FAG one-way bearing inspection and troubleshooting steps

The track sound of the bearing and its control method The track sound is a slippery continuous sound that the rolling element rolls on the raceway surface when the bearing is running. It is the unique basic sound that all FAG bearings will produce. The general one-way bearing sound is the rolling sound plus other sounds. The greater the rigidity of the bearing housing, the lower the sound pressure level of the raceway sound. If the radial clearance is too small, the sound pressure level and the main frequency of the raceway sound will increase sharply as the radial clearance decreases.
One-way bearing fatigue failure is a failure of the surface form, mainly manifested by fatigue crack initiation, expansion and fracture processes, and the long-term effects of load failure on the metal. The crack is in two ways:
1. From the surface, this is the external load caused by the cyclic deformation of the plastic surface of the FAG bearing during the rolling contact due to the plastic deformation of the working surface and the strained surface of the strain hardening surface, and finally developed in the small crack. The inner surface, the formation of surface cracks between the two, due to the intrusion of lubricant into the working surface, the open force, severely hitting the wall, forcing the crack to advance;
2, from the surface layer, repeated pressure, surface contact, initially cracked cracks at the surface where the surface is exposed, and the angle along the surface direction, to a certain depth, from the surface of the contact surface, and beyond The surface, and eventually formed an eclipse, leaving a horse pit.
From the surface of the one-way bearing, or from the crack of the surface layer, these two objectives (parts carburizing, quenching and other surface heat treatment, if there is uneven hardness, microstructure, and non-uniform internal stress and other disadvantages, then Contact stress is generally caused by the influence of the opposite underground crack. If the surface quality of the part is poor, there is a defect (oxidation, decarburization), friction or poor lubrication, from the surface crack.
The method of controlling the rolling sound is to select a low-noise FAG bearing, that is, a bearing with a small waviness, and carefully select the conditions of use. The raceway sound often affects the noise of the entire machine, and reducing the raceway sound can reduce the noise of the entire machine.
Rolling sound of one-way bearing and its control method Rolling sound is a harsh metal friction sound that can occur in cylindrical roller bearings in all occasions. Most of them occur in grease-lubricated larger type bearings, and the performance of base oil deteriorates. Grease is more likely to occur and hardly occurs when oil is lubricated. In addition, it is more likely to occur in winter. When subjected to pure radial load, it is easy to occur in the case of large radial clearance, and it is easy to occur in a certain speed range depending on the size of the model, and it will occur continuously. It will appear intermittently. Special processing methods for the outer ring raceway can prevent the occurrence of rolling noise. If necessary, the bearing can be selected, or the radial clearance of the FAG bearing can be appropriately reduced, and the grease with excellent performance and the matching with the bearing can be used. rigidity

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Cause analysis and rust prevention maintenance method for IKO thrust ball bearing raceway noise

First, the analysis of the cause of bearing raceway noise
a. Noise and vibration are random;
b. The vibration frequency is above 1 kHz;
c. Regardless of the change in the rotational speed, the main frequency of the noise is almost constant and the sound pressure level increases as the rotational speed increases;
d. When the radial clearance increases, the sound pressure level increases sharply;
e. The rigidity of the bearing seat increases, and the lower the total sound pressure level, the total sound pressure level increases little even if the rotation speed increases;
f. The higher the viscosity of the lubricant, the lower the sound pressure level, but for grease lubrication, the viscosity and shape of the soap fiber can affect the noise value.
The source of the rolling sound is caused by the natural vibration of the ferrule after the load. Due to the elastic contact of the ferrule and the rolling body, a nonlinear vibration system is formed. When the lubrication or machining accuracy is not high, the natural vibration associated with this elastic characteristic is excited, and when it is transmitted to the air, it becomes noise. It is well known that even if IKO bearing parts are processed using the most advanced manufacturing techniques in the world, there will always be small geometric errors in the working surface, which will cause small fluctuations between the raceway and the rolling elements to excite the natural vibration of the vibration system.
Although the rolling ball bearing raceway noise is unavoidable, it is possible to use high-precision machining of the working surface of the part, the correct use of IKO bearings and the precise use of bearings to reduce noise and vibration.
Second, anti-rust maintenance method
1. Immersion method: IKO bearing is immersed in anti-rust grease, so that the surface is adhered with a layer of anti-rust grease. The oil film thickness can be achieved by controlling the temperature or viscosity of the rust preventive grease.
2. Brushing method: It is used for IKO bearings or special-shaped bearings that are not suitable for soaking or spraying. When brushing, it is necessary to pay attention not to produce anti-rust oil accumulation, but also to prevent leakage coating.
3, spray method: some large thrust ball bearings can not be immersed oil, generally with a pressure of about 0.7Mpa of filtered compressed air in the air cleaning place for spraying. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil, but it must adopt perfect fire and labor protection measures.

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