The difference between sliding bearing and bearing rolling bearing maintenance

Repair of plain bearings

1. Repair of bearing bush: The bearing bush of sliding bearing is the most easily worn or burned part. Generally speaking, if the wear, abrasion, peeling and melting of the bearing alloy surface are greater than 25% of the bearing pad contact area, the bearing alloy should be re-cast.
2. Grinding and scraping of the bearing bush: When grinding and scraping the bearing bush, first coat a layer of red lead oil on the pump shaft, then put the pump shaft in the bearing bush and turn it back and forth twice, and take out the pump shaft. At this time, many sizes will be seen on the bearing surface. Small black dots that are not evenly distributed. These small black dots indicate the raised part of the bearing bush, which should be gently scraped off with a scraper. Then, repeat the above steps until the small black dots shown on the surface of the bearing bush are evenly and densely distributed. When grinding and scraping, the bearing bush should be scraped off first, and then the bearing bush should be scraped.
3. Measurement method of the gap between the journal and the bearing bush: The gap measurement between the journal and the bearing bush is generally measured by the lead wire method. When measuring, first place the diameter on both sides of the lower half bearing bush of the bearing and the top of the journal. 1-1.5mm fuse, then close the upper bearing bush and bearing cover, tighten the bolts, then open the bearing cover, take out the crushed fuse, and measure its thickness with a micrometer (usually measure 3-5 along the length of the fuse). point to take the average).

Repair of rolling bearings

1. The average service life of rolling bearings is about 5000h. If they are used for a long time or improperly installed and maintained, the bearings will be damaged. If it is found that there are cracks in the inner and outer rings of the rolling bearing, the ball is broken, and the gap between the ball and the inner and outer rings is measured with a 03mm feeler gauge exceeding the specification, the new bearing should be replaced.
2. If the inner ring is tight or the rotation is not flexible enough, it may be that the cage of the ball is deformed and twisted and the bearing ring produces mechanical friction. At this time, the cage can be tapped lightly with a hand hammer to correct its deformation.
3. If there is rust on the surface, it can be wiped off with fine sandpaper, then washed and dried.
4. The pump shaft and the inner ring of the bearing are tightly matched. Generally, the pressing method is used. If there is difficulty, the heating method can be used.

Disassembly and assembly of rolling bearings

The fit of the rolling bearing and the shaft is based on the base hole, and the fit with the bearing seat is based on the base shaft. The rotating ring matched with the rolling bearing generally adopts an interference fit, while the fixed ring often uses a small gap and a small interference fit.

(1) Before assembly, the oil, holes, bearings and accessories should be cleaned with kerosene or gasoline to remove rust spots and burrs.

(2) Carefully check whether the parts are defective, whether the mutual matching accuracy meets the requirements, rotate the bearing by hand, listen to whether there is any abnormal noise, check whether the tightness of the bearing fit is appropriate, and after checking, generally grease the bearing for equipment.

(3) When disassembling and assembling the bearing, the force should be applied on the ring with the tighter assembly force, and the force should be uniform and symmetrical to avoid damage to the mating surface.

(4) Before disassembling the bearing, remove the fixing parts of the rolling bearing, such as pressure plate, spring retaining ring, tightening ring, finned washer and gland, etc. After assembling, the above fixing parts should be assembled without loosening.

(5) The assembly should pay attention to cleaning, prevent foreign objects from falling into the bearing, and the end face of the bearing should fit the bearing surface of the shaft shoulder or hole.

Analysis of the Causes of Electric Corrosion in Bearings

Since most operators are familiar with basic computer operations, the data entered and collected in the database are complete, enabling the system to run normally. contributed to the acceleration. With the acceleration of passenger trains, especially the safety of the running parts of passenger trains and the prevention of train electrical fires, etc., have been widely paid attention to by various vehicle manufacturing departments and maintenance and use departments. With the continuous update of passenger cars, we also found some problems in the use of passenger cars, such as the design of the grounding protection device of the passenger car is a question worth discussing.

This is because we found in the bearing maintenance that there are several ways for the electric corrosion of passenger car bearings. There are two main ways to cause electric corrosion of bearings in the use of passenger cars and maintenance of passenger cars. One is the electric welding operation of passenger cars during daily maintenance or regular maintenance. Without good grounding protection, electrical corrosion of the bearing is caused. This electrical corrosion is mainly A in the above-mentioned morphological characteristics.

At present, most units have realized its hazard. When conducting electric welding operations, the grounding wire is directly connected from the car body or bogie to the rail or the ground, so that the current can be prevented from passing through the bearing. Therefore, the probability of this kind of electric corrosion phenomenon is small at present.

Analysis of the causes of electrical corrosion in bearings For a rolling bearing that operates normally, the rolling elements and the inner and outer ring raceways are separated by a lubricant film. When current flows through the rolling bearing, electrical discharge occurs through the lubricant between the inner and outer raceways and the rollers. The heat generated by the discharge will cause the metal surface of the bearing to melt locally, forming discharge marks, and the molten material particles make the local become very loose, and the melted material re-hardens and is much more brittle than the original bearing material.

Beneath the hardened material is a layer of toughened material that is softer than the surrounding material. Striped parallel grooves are the result of mechanical resonances caused by dynamic effects as the rolling elements of a bearing roll over those smaller discharge marks, which are only visible after a period of use.

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