Method and new application of inspection and deterioration of imported bearing grease

Core Tip: For imported bearings, the inner and outer rings can be mounted separately, which simplifies the installation process, especially when the inner and outer rings require interference fit. In the inner ring has been installed in place
For imported bearings, the inner and outer rings can be mounted separately, which simplifies the installation process, especially when the inner and outer rings require an interference fit. When loading a shaft with the inner ring in place into a bearing housing that already contains an outer ring, care must be taken to check that the inner and outer rings are properly centered to avoid scratching the bearing raceways and rolling parts. If the cylindrical and needle bearing are fitted with an inner ring without flange ribs or an inner ring with flanged sides on one side, it is recommended to use a mounting sleeve. The outer diameter of the sleeve shall be equal to the inner ring raceway diameter F, and the tolerance for machining shall be d10. Drawn cup needle roller bearings are preferably mounted using a mandrel. The lubrication of imported bearings is basically the same as that of other rolling bearings. However, the working conditions of imported bearings are relatively harsh, and the effective performance of the working performance depends largely on the lubrication of the bearings.
The lubrication methods used for imported bearings are mainly grease lubrication and oil lubrication. The grease-lubricated grease has a sealing function, the sealing structure and the lubrication facility are simple, and the grease is convenient to be replenished, so the imported bearings are generally grease-lubricated as long as the working conditions permit. The oil lubrication has a strong cooling effect and can remove dirt and moisture from the bearing. The oil-lubricated lubrication methods for imported bearings include pressure oil lubrication, fuel injection lubrication, oil mist lubrication and oil and gas lubrication. Pressure oil lubrication is the most effective lubrication method for imported bearings at normal speed. Injection lubrication is to lubricate the lubricating oil with a certain pressure through the injector mounted on one side of the bearing for lubrication. It is generally used in high-speed imported bearings, or where the pressure supply lubrication cannot meet the cooling requirements. Spray lubrication is to spray dry compressed air containing oil mist into the bearing for lubrication. The amount of oil used is small. Due to the action of air, the cooling effect is extremely strong. It is mainly used for large imported bearings with high rolling speed and high rolling precision. Or for imported bearings that are not frequently removed in the bearing housing. Pressure oil lubrication and fuel injection lubrication need to install inlet and outlet pipes, lubrication pumps, oil reservoirs, and sometimes oil coolers. Therefore, the cost is high, and the imported bearings are generally used less.
Grease is very critical in the process of using imported bearings. The use of a deteriorated grease will cause damage to the bearing. For the inspection of bearing grease, there are the following methods:
Oil droplet trace method
Take a clean white filter paper, drop a few drops of oil on the filter paper. After the oil leaks, if there is black powder on the surface, touch the hand with a feeling of resistance, it means that there are many impurities in the lubricant, good. The lubricating oil has no powder, is dry and smooth by hand, and has a yellow mark.
2. Handcuffs
The lubricant is rubbed repeatedly between the thumb and the index finger. The better lubricant feels lubricated, less wear debris, and no friction. If you feel a large friction between the fingers, it means lubricating oil. There are many impurities inside, can not be reused, should be replaced with new lubricants.
3. Illumination method
On a clear day, use a screwdriver to pry the lubricant at a 45-degree angle to the horizontal. Observe the sunlight and observe the oil droplets. Under the light, it can be clearly seen that there is no wear debris in the lubricating oil, which can continue to work. If the grinding debris is too much, the lubricating oil should be replaced.

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A few simple tricks to help you maintain the bearings

Core Tips: 1. Maintenance and Inspection of Imported Bearings In order to maintain the original performance of the bearing in a good condition for as long as possible, maintenance, overhaul, and accident prevention are required to ensure operation.
1. Maintenance and overhaul of imported bearings
In order to maintain the original performance of the 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 bearing rotation sound, vibration, temperature, lubricant state, and the like.
2. Damage and countermeasures of imported bearings
In general, if the 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 imported 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 foreign matter intrusion, the bearing installation error, the shaft deflection If the song is too big, there will be coincidences of these reasons.
Therefore, it is difficult to know the true cause of the damage by only investigating the damage of the imported bearings. However, if you know the mechanical use of the bearing, the conditions of use, the structure around the bearing, and the situation before and after the accident, combined with the damage state of the bearing and several reasons, it can prevent similar accidents from happening again.
3. The precautions regarding the use of imported bearings are as follows:
(1) Keep imported bearings and their turnover clean
  Even small dust that is invisible to the eyes can have a bad effect on imported bearings. Therefore, keep the area clean so that the dust does not intrude into the imported bearings.
(2) Use with care
In the use of the imported bearings, strong impact, will produce scars and indentations, which is the cause of the accident. In severe cases, cracks and breaks occur, so care must be taken.

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