Reasons for INA bearing corrosion and preventive measures
The biggest natural enemy of the bearing is corrosion, which is extremely serious damage to the bearing. Due to the influence of various internal and external factors, the bearing is corroded more and more. In general, there are six reasons:
1. The problem of the chemical composition and structure of the bearing metal material itself.
2. The metal surface finish of the bearing is corroded by the difference in oxygen concentration.
3. The bearing is in contact with other metal surfaces.
4. The metal surface of the bearing is in contact with various environmental media.
5. The bearing is affected by the ambient temperature and humidity.
6, there is also the human sweat is also the cause of corrosion of the INA bearing, its pH is 5 ~ 6. Therefore, in order to prevent rust caused by hand sweat, the installation and production personnel should wear gloves, do not touch the inlaid solid lubrication bearing by hand.
To prevent the bearing from being corroded, some precautions can be taken. If it can be coated with anti-rust oil to prevent rust. The three oiling methods are described below.
1. Use the method of soaking to adhere the INA bearing surface to a layer of anti-rust grease. For some small bearings, they can be immersed in rust preventive grease. The thickness of the oil film can be achieved by controlling the temperature or viscosity of the rust preventive grease.
2, brushing method: pay attention to evenly applied to the surface of the inlaid solid lubricating bearing when brushing, it is best not to accumulate, but also pay attention to prevent leakage coating.
3. Spray method: For some large-scale anti-rust materials, it is not suitable to apply oil by immersion method. The spray method is suitable for solvent-diluted anti-rust oil or thin-layer anti-rust oil. However, it should be noted that this method must be based on sound fire protection and labor protection measures.
Bearing type selection considerations
When selecting the bearing type, it is important to fully understand the conditions of use of the bearing. The following table lists the main analysis items: Analysis Project Selection Method
1) Bearing installation space Bearing type that can be accommodated in the bearing installation space Since the rigidity and strength of the shaft are important when designing the shaft system, the shaft diameter, that is, the inner diameter of the bearing, is generally determined first.
However, rolling bearings are available in a variety of sizes and types, and the most suitable bearing type should be selected.
2) The size, direction and nature of the load bearing load [The bearing capacity of the bearing is expressed by the basic rated load, and its value is shown in the bearing size table] The bearing load is rich, such as the magnitude of the load, whether there is only radial load, axial load Whether it is one-way or two-way, the degree of vibration or shock, and so on. After considering these factors, choose the most suitable bearing type.
In general, the radial load capacity of bearings of the same inner diameter is increased in the following order: deep groove ball bearings < angular contact ball bearings < cylindrical roller bearings < tapered roller bearings < spherical roller bearings
3) The bearing type whose speed can adapt to the mechanical speed [the limit value of the bearing speed is expressed by the limit speed, and its value is shown in the bearing size table] The limit speed of the bearing is not only determined by the bearing type but also the bearing size, cage type, and accuracy grade. , load conditions and lubrication methods, etc., therefore, these factors must be considered when selecting.
Most of the following bearings are used for high speed rotation:
Deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings
4) Rotational accuracy Bearing type with required rotation accuracy [The dimensional accuracy and rotation accuracy of bearings have been standardized by GB according to bearing type]? Machine spindles, gas turbines and control machines require high rotational accuracy, high speed and low friction, respectively. Bearings with a precision of 5 or more should be used at this time.
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