1. Friction compatibility
The performance of preventing adhesion and boundary lubrication when the shaft diameter is in Koyo Linear direct contact with the bearing bush. The material factors affecting the friction compatibility of friction pairs are:
(1) The difficulty of forming alloy in metallurgy.
(2) Affinity between material and lubricant.
(3) The friction coefficient of the paired material under the condition of no lubrication.
(4) Microstructure of materials.
(5) Thermal conductivity of the material.
(6) The surface energy of the material and the characteristics of the oxide film.
2. The ability of embedded materials to prevent scratch or (and) abrasive wear by allowing foreign hard particles in the lubricant to be clamped in. For metal materials, those with low Koyo Linear hardness and low elastic modulus have good embeddedness, while non-metallic materials are not necessarily.
For example, carbon graphite has low elastic modulus, but poor Koyo Linear embeddedness. Koyo bearings usually use softer materials and harder materials to form friction amplitude, and softer materials are generally used as bearing shells.
3. Running in ability to reduce the processing error, coaxiality error and surface roughness parameter value of shaft diameter and bearing bush during the running in process of shaft diameter and Koyo Linear bearing bush, so as to make the contact uniform, so as to reduce the friction and wear rate.
4. The elastic-plastic deformation of the surface layer of the friction compliant material compensates the poor initial fit of the sliding friction surface and the flexural performance of the shaft. Koyo Linear Materials with low elastic modulus have better compliance.
Under the specified wear conditions, the wear resistance is expressed by the wear rate or the reciprocal of wear degree and wear amount.
6. Fatigue resistance the ability of materials to resist fatigue failure under cyclic load. At the service temperature, the strength, hardness, impact strength, microstructure uniformity and fatigue resistance of bearing materials are very important. Materials with good running in and embeddedness usually have poor fatigue resistance.
7. Corrosion resistance the ability of materials to resist corrosion. When the lubricating oil is used in the atmosphere, it will gradually Koyo Linear oxidize and produce acidic substances.
Moreover, most lubricating oils also contain extreme pressure additives, which will corrode Koyo bearing materials. Therefore, Koyo bearing materials need to have corrosion resistance.
8. When the cavitation resistant solid moves relative to the liquid, when the bubble in the liquid Koyo Linear breaks near the solid surface, it will produce local impact high pressure or local high temperature, which will lead to cavitation wear.
The ability of materials to resist cavitation wear is called cavitation resistance. Generally, copper lead alloy, Koyo bearing alloy and aluminum zinc silicon alloy have good cavitation corrosion resistance.
9. Compressive strength is the ability to bear unidirectional load without being crushed or changing size.
The judgment criteria vary according to mechanical Koyo Linear properties, importance and inspection cycle. In case of the following damage, the Koyo bearing shall not be reused and must be replaced.
1) Fracture and defect of linear bearing parts.
2) Stripping of the rolling surface of the raceway surface.
Fault identification method of bearing
Without disassembly and inspection, it is very important to identify or predict the fault of linear bearing in operation, which is very important to improve productivity and economy.
The main identification methods are as follows:
1) Recognition by sound
Recognition by sound requires a wealth of experience. Must be fully trained to recognize bearing sound and non Koyo bearing sound. This work should be carried out by special personnel as far as possible. The sound of the bearing can be clearly heard by sticking the listener or listening stick to the shell.
2) Identification by operating temperature
This method is a comparative identification method, which is only used in the situation where the running state does not change much. For this purpose, continuous temperature recording must be carried out. In case of failure, not only the temperature rises, but also irregular changes occur.
3) Identification by lubricant status
The lubricant shall be sampled and analyzed to judge whether its turbidity is mixed with foreign Koyo Linear matters or metal powder. This method is particularly effective for Koyo bearings or large bearings that cannot be close to observation.