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Bearing faults are often due to a variety of factors, the influence of all design and manufacturing Failure Caused process factors and SKF Bearing Faults, and their analysis is not easy to determine. Under normal circumstances, in general, you can consider and analyze factors and internal factors.
The main factors used for Failure Caused adjustment are installation, use and maintenance, maintenance and repair, which meet the technical requirements. The installation condition is one of the factors for the use of bearings.
It is the primary factor of the load-bearing force that often causes the state change between various parts of the incorrect installation package, and the operation and Failure Caused early failure in the abnormal state. According to the technical requirements of SKF Bearing installation, use,
maintenance and maintenance, the contact load, speed, temperature, vibration, noise and lubrication status of the operating bearing shall be monitored and checked. If any abnormality is found,
the cause shall be found Failure Caused immediately and adjusted back to normal. In addition, the quality of oil and surrounding media and atmosphere are also very important for analysis and testing.
Internal factors mainly refer to structural design, manufacturing process and materials. There are three factors that determine the quality of bearings.
First of all, with advanced Failure Caused structural design, there will be a longer SKF Bearing Life. Bearing manufacturing will go through multiple processes of forging, heat treatment, turning, grinding and assembly. The rationality, advanced nature and stability of the treatment will also affect the service life of the bearing.
The influence of bearing heat treatment and grinding process is often more directly related to bearing failure, which is related to product quality. In recent years, the deterioration of bearing Failure Caused surface layer shows that the grinding process is closely related to the bearing surface quality.
With the progress of Metallurgical Technology (such as bearing steel, vacuum degassing, etc.), the Failure Caused quality of raw materials has been improved. The proportion of raw material quality factor in bearing fault analysis has decreased significantly,
but it is still one of the main factors of bearing failure. Whether the selection is appropriate or not is still a bearing fault analysis that must be considered.
The main task of SKF Bearing Failure analysis is to find out the main factors causing bearing failure based on a large number of background materials, data and failure mode analysis, so as to make targeted improvement and prolong the service life of the bearing, so as to avoid the early failure of unexpected events of the bearing.
During installation, do not directly hammer the end face and non stressed surface of NSK bearing. Use pressure block, sleeve or other installation tools to make the bearing bear uniform force. Do not drive the installation through the rolling element.
If the mounting surface is coated with lubricating oil, the installation will be more smooth. If the fit interference is large, the bearing shall be put into mineral oil and heated to 80 ~ 90 ℃ before Failure Caused installation as soon as possible. The oil temperature shall be strictly controlled not to exceed 100 ℃ to prevent tempering effect,
hardness reduction and size recovery. In case of difficulty in disassembly, it is recommended that you use the disassembly tool to pull outward and carefully pour hot oil on the inner ring. The heat will expand the bearing inner ring and make it easier to fall off.
Not all NSK Bearings require small working clearance. You must choose the appropriate clearance according to the conditions. In national standard 4604-93, the radial clearance of rolling bearing is divided into five groups – group 2, group 0, group 3, group 4 and group 5.
The clearance value increases from small to large, of which group 0 is the standard clearance. The basic radial clearance group is Failure Caused suitable for general operating conditions, conventional temperature and common interference fit;
Large radial clearance should be selected for bearings working under special conditions such as high temperature, high speed, low noise and low friction; Small radial clearance should be selected for precision spindle and NSK bearing for machine tool spindle; For roller bearings, a small amount of working clearance can be maintained.
In addition, there is no clearance for separate bearings; After installation, the working clearance of the bearing after installation is smaller than the original clearance before installation, because the bearing has to bear certain load rotation, as well as the elastic deformation caused by bearing fit and load.