Several points of attention for maintaining and testing NTN bearings

1. In the process of using NTN bearings, regular cleaning is very important. How to clean the bearings accurately? When the bearing is first removed for inspection, first use the method of photography to make a good appearance record. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings.

2. The cleaning of the bearing is divided into rough washing and fine washing, and the metal mesh frame can be placed on the bottom of the used container.

3. When rough washing, clean the grease or adhesive with a brush on the top of the oil. At this time, if the transfer bearing is moved in the oil, the rolling surface is damaged by foreign matter such as foreign matter.

4. When fine washing, slowly shifting the bearing in the oil, it must be forced to stop.

5. The cleaning agent used on weekdays is neutral non-aqueous diesel or petroleum, and sometimes uses warm alkaline liquid according to demand. Regardless of which cleaning agent is used, it is often necessary to filter and clean the cockroach.

6. Immediately after cleaning, apply anti-rust oil or anti-rust grease to the NTN bearing.

In order to make the imported bearings serve the mechanical operation for a longer period of time, it is necessary to perform regular inspections on the NTN bearings on a regular basis. Through the inspection, the problems caused by the mechanical operation can be effectively found, and the problems can be solved satisfactorily. Increased bearing life.

At the time of inspection, it is mainly correct to observe whether the rivet head of the bearing is skewed or loosely welded. The welding of the cage is good or bad. Whether the solder joint is too small, there is a problem that the solder is not strong, or the ball is caused by excessive soldering. They are all special places to pay attention to when testing imported bearings. There are still some issues to be aware of.

Local inspection of the bearing. First of all, the inspection of imported bearings in the environment should be carried out in a light environment, preferably astigmatism, in order to better observe the outside of the bearing and see that there are no cracks and other abnormalities on the surface. For example, wear, scratches and bumps in the mechanical cloud process can cause the bearing device to shift, resulting in poor position of the device, causing flat load and stress concentration, and the accuracy and service life of the molded bearing are reduced.

In addition, the working environment also pays special attention to moisture or contaminants, which are most likely to cause the bearing to rust. The rust is caused by poor installation of the NTN bearing, and early wear and tear, and the bearing will be directly scrapped. Therefore, pay special attention to waterproof and moisture during use.

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Regular lubrication and maintenance of SKF bearings to avoid failure

1, grease lubrication

Relubrication of SKF bearings is best carried out during planned equipment downtime and is periodically replenished, while removing old grease or extruding old grease through the drain. Wipe the grease fittings clean before adding fresh grease. If the bearing housing does not have a grease fitting, the bearing housing cover or end cap should be opened to remove the old grease and, after cleaning, replenish the same type of fresh grease.

2, lubricating oil lubrication

Regularly check the oil level and oil quality of the lubricating oil. Under normal circumstances, the normal oil level should be within the range of 1/3-2/3 of the equipment oil level window or mark. The oil filling method is oil cup, the oil level shown only represents the oil replenishing capacity, and the bearing tank oil level is to meet the operation requirements. The oil level in the oil cup is less than 1/4 of its total volume.

Check and replenish the oil method, take a small amount of lubricating oil as a sample and compare it with fresh oil. The competent unit can consider the oil quality test to ensure the oil quality is qualified. If the sample looks cloudy, it may be the result of mixing with water, which is commonly referred to as oil emulsification. At this point, the lubricant should be replaced.

If the sample is darkened or thickened, it may indicate that the lubricant has begun to carbonize and the old lubricant should be completely replaced. If possible, flush the oil line with fresh oil. When changing the lubricating oil, make sure that the new and old models of the replaced oil are the same and supplement the required oil level.

Use an oil bath type lubrication system. If the oil temperature is below 60 ° C (140 ° F) and the lubricant is not contaminated, replace the lubricant once a year. If the oil temperature is between 60-100 ° C (140-210 ° F), the lubricant needs to be replaced four times a year. If the oil temperature is between 100 and 120 ° C (210-250 ° F), the lubricant needs to be replaced once a month. If the oil temperature is above 120 ° C (250 ° F), the lubricant needs to be replaced once a week.

Proper installation and maintenance are important factors in the normal operation of SKF bearings. At the same time, care must be taken to maintain the cleanliness of the bearings. Bearings must be protected from contaminants and moisture and must be properly installed and lubricated. In addition, the design of the bearing arrangement, the condition of the oil seal, the form of the lubricant and the replacement cycle and the special maintenance also play an important role and must be paid attention to.

Common faults in imported bearings are as follows:

1, tile surface corrosion: spectral analysis found that the concentration of non-ferrous metal elements is abnormal; there are many sub-micron wear particles of non-ferrous metal components in the iron spectrum; lubricating oil moisture exceeds the standard, acid value exceeds the standard.

2, the surface of the journal is strained: there are iron-based cutting abrasive grains or black oxide particles in the iron spectrum, and there is tempering color on the metal surface.

3, the surface corrosion of the journal: Spectral analysis found that the concentration of iron is abnormal, there are many sub-micron particles of iron in the iron spectrum, and the moisture of the lubricating oil exceeds the standard or the acid value exceeds the standard.

4, surface strain: found in the iron spectrum cutting abrasive particles, abrasive particles are non-ferrous metals.

5, fretting wear behind the tile: spectral analysis found that the iron concentration is abnormal, there are many iron components in the iron spectrum sub-micron wear particles, lubricating oil moisture and acid value is abnormal.

Under liquid lubrication conditions, the sliding surface is separated by the lubricating oil without direct contact, and the friction loss and surface wear can be greatly reduced, and the oil film also has a certain vibration absorbing capability.

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