Rolling mill SKF imported bearing lubrication method

First, the lubrication method

The lubrication of the imported bearings of the rolls is basically the same as that of the other rolling imported bearings. However, the working conditions of the imported bearings of the rolls are relatively harsh, and whether the working performance can be effectively exerted depends largely on the lubrication of the imported bearings.

The lubrication methods used for the roller bearings are mainly grease lubrication and oil lubrication.

Grease-lubricated grease has a sealing function, the sealing structure and lubrication facilities are simple, and the grease is convenient to be replenished. Therefore, as long as the working conditions permit, the roller inlet bearings are generally grease-lubricated.

Oil lubrication has a strong cooling effect and can remove dirt and moisture from the imported bearings. Roller inlet bearings use oil-lubricated lubrication methods such as pressure oil lubrication, fuel injection lubrication, oil mist lubrication and oil and gas lubrication.

Pressure oil lubrication is the most effective lubrication method for roller bearings at normal speed.

The injection lubrication is to lubricate the lubricating oil to the inside of the inlet bearing through a nozzle mounted on one side of the inlet bearing for a certain pressure. Generally, it is applied to the high-speed roller inlet bearing, or the pressure supply lubrication cannot meet the cooling requirement. .

Spray lubrication is to spray dry compressed air containing oil mist into the inside of the imported bearing for lubrication. The use of less oil, due to the action of air, the cooling effect is very strong, mainly used for large roll imports with high rolling speed and high rolling precision. Bearings, or roll inlet bearings that are not often removed in the imported bearing housing.

Pressure oil lubrication and fuel injection lubrication require the installation of inlet and outlet pipes, lubrication pumps, oil reservoirs, and sometimes oil coolers. Therefore, the cost is high, and the general roller inlet bearings are less used.

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Regular lubrication and maintenance of KOYO bearings

Proper lubrication and maintenance can maximize the life of KOYO bearings.

1, grease lubrication

The relubrication of KOYO bearings is best carried out during the planned downtime of the equipment and is periodically replenished, while the old grease is removed or the old grease is squeezed out through the drain. Wipe the grease fittings clean before adding fresh grease. If the KOYO bearing housing does not have a grease fitting, the KOYO 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 oil level of KOYO bearing housing 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 100-120 ° C and 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 KOYO bearings. At the same time, care must be taken to maintain the cleanliness of KOYO bearings. KOYO bearings must be protected from contaminants and moisture and must be properly installed and lubricated. In addition, KOYO bearing design, oil seal condition, lubricant form and replacement cycle and special maintenance also play an important role, and must be paid attention to.

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