IA ball screw bearing use damage countermeasures

INA bearing structure design is fair and has the ability to improve the predecessor, will have a longer ball screw bearing life. Bearings are manufactured through multiple processing steps such as casting, heat treatment, turning, grinding and assembly. The fairness of each processing technology, the improvement of predecessors, and the inconsistency will also affect the life of the bearing. The heat treatment and grinding processes that affect the quality of the finished bearing often have a more direct relationship with the failure of the bearing. In recent years, research on the metamorphic layer of bearing working surface shows that the relationship between grinding process and bearing surface quality is closely related.
The metallurgical quality of INA bearing materials was once the main factor affecting the early failure of dynamic ball bearings. With the improvement of metallurgical technology (such as vacuum degassing of bearing steel), the quality of raw materials is improved. The proportion of raw material quality factors in bearing failure analysis has dropped significantly, but it is still one of the main factors affecting bearing failure. The proper selection of materials is still a factor that must be considered in bearing failure analysis.
The main task of INA bearing failure analysis is to find out the main factors causing bearing failure based on a large number of background materials, analysis data and failure modes, so as to propose improvement measures in a targeted manner, prolong the service life of bearings and avoid sudden occurrence of bearings. Early failure of sex.
1, bearing maintenance, overhaul, and abnormal handling
   In order to maintain the original performance of the ball screw bearing in a good condition for as long as possible, it is necessary to maintain, repair, and prevent accidents, ensure the reliability of operation, and improve productivity and economy. Maintenance is best carried out on a regular basis in accordance with the operating standards for the mechanical operating conditions. The contents include monitoring of operating conditions, replenishment or replacement of lubricants, and inspections for periodic disassembly.
   As a maintenance item during operation, there are INA bearing rotation sound, vibration, temperature, lubricant status, and so on.
2, bearing damage and countermeasures
   In general, if the INA bearing is used correctly, it can be used until the fatigue life is reached. However, there will be accidents that are prematurely damaged and are not resistant to use. This early damage, as opposed to fatigue life, limits the quality of what is known as a fault or accident. Many of them are caused by inadvertent installation, use, and lubrication, and foreign objects intruding from the outside are insufficiently studied for the thermal effects of the shaft and the outer casing.
   Regarding the damage state of the bearing, for example, the jam of the ferrule of the roller bearing, as a cause, the lubricant is insufficient, unsuitable, the defect of the oil supply structure, the intrusion of foreign matter, the mounting error of the ball screw bearing, the shaft If the deflection is too large, there will be coincidences of these reasons.
   Therefore, it is difficult to know the true cause of the damage by only investigating the bearing damage. However, if you know the mechanical use of the bearing, the conditions of use, the structure around the INA bearing, and the situation before and after the accident, combined with the damage state of the ball screw bearing and several reasons, it can prevent similar accidents from happening again.

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INA powder metallurgy bearing motion track regular inspection method

The rolling surface of the bearing, the inner ring and the outer ring, because the moving body is in contact with the moving body, the running track is a dark surface, and the running track attached to the rolling surface is not an abnormality, so that the load premise can be known. Therefore, in the case of removing the powder metallurgy bearing, please pay attention to and observe the running track of the raceway surface. If you carefully observe the trajectory, you will know that you only bear radial loads, withstand large axial loads, withstand moment loads, or have extreme rigidity in the bearing housing.
It can be said that these reasons overlap with each other. Therefore, in order to fully understand the machine used in the INA bearing, the premise, the structure of the bearing periphery, if the situation before and after the accident can be clarified, combined with the damage of the powder metallurgy bearing and various reasons, it can be Prevent the recurrence of similar accidents.
If there is no choice error and can be used accurately, it will take a long time before the bearing life, in which case the damage state is peeling. On the other hand, there are accidental early damages, and early damage that cannot be used, as the cause of the early damage, there are insufficient considerations for use and lubrication, and further foreign matter intrusion, bearing assembly error and shaft deflection are large. Research on shafts and bearing housings is not enough.
INA bearings show late failure characteristics to serious failures (generally bearing damage such as axles, burns, sand cracks, raceways, bead wear, etc.) are not more than one week, the larger the equipment capacity, the faster the speed. The shorter the interval. Therefore, in the actual fault diagnosis of powder metallurgy bearings, once the late fault characteristics are found, the bearing should be judged decisively and the maintenance should be arranged as soon as possible.
The causes of noise generated by rolling bearings are more complicated. One is the wear of the inner and outer rings of the bearing. Due to this wear, the bearing and the housing, the bearing and the shaft are broken, resulting in the axis deviating from the correct position and generating an abnormal sound when the shaft is moving at a high speed. When the INA bearing is fatigued, the surface metal peeling off will also increase the radial clearance of the bearing to produce abnormal noise. In addition, insufficient bearing lubrication, dry friction, and bearing crushing can produce abnormal sounds. After the bearing wears loose, the cage is loose and damaged, and abnormal noise is also generated.
When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When the body of the mechanism is touched by hand, it should be normal to not feel hot, otherwise the bearing temperature is too high.
The reasons for the bearing temperature being too high are: the quality of the lubricating oil does not meet the requirements or deteriorates, the viscosity of the lubricating oil is too high; the assembly of the mechanism is too tight (the gap is insufficient); the assembly of the powder metallurgy bearing is too tight; the bearing race rotates on the shaft or inside the casing; Excessive load; INA bearing cage or rolling element fragmentation.
The vibration system consisting of steel, flexibility, mass, damping, etc., determined by the bearing structural design parameters, will produce vibrations that are compatible with its mechanics under operating conditions.

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