NSK bearings how to test whether the metamorphic - bearing grease knowledge

by:Waxing     2020-05-25
In the process of use NSK bearings, grease is critical. If bad grease, used, not only don't function, and also will damage the NSK bearings. 1. Illumination method on a clear day, NSK bearing lubricating oil lifted with a screwdriver, and horizontal Angle of 45 degrees. Sunshine, observe the oil situation, under the light, can see clearly in the bearing lubricating oil chip is good, can continue to function, if excessive wear debris, lubricating oil should be changed. 2. Oil droplets trace method in a clean white filter paper, number of oil drops on the filter paper, after waiting for lubricating oil leakage, if the surface is black powder, touch resistance acerbity feeling, is the lubricant inside has many impurities, good oil powder, with the hand feels dry, smooth, and yellow. 3. Take oil flow observation two cups, one of the NSK bearings need to be checked out of lubricating oil, empty on the desktop, the other will leave the measuring cup with lubricating oil for high 30 - desktop 40 cm and tilt, NSK bearing lubricating oil to flow into the empty cup slowly, observe its flows, good quality lubricant oil flow should be long and thin, uniform, continuous, if appear oil flow fast and slow, and sometimes has a large flow, the said lubricating oil has deteriorated. 4. NSK bearing lubricating oil hand twist method will lay between his thumb and his finger grinding repeatedly, good lubricating oil hand feel less lubricity, wear debris, no friction, if feel fingers between the larger friction feeling such as sand, suggests that the impurity, lubricating oil can no longer use, a new lubricating oil should be replaced. ( A) NSK bearing lubrication effect of lubrication on the fatigue life of rolling bearing, friction and wear, temperature rise, vibration and so on have important influence, not the normal lubrication, NSK bearings can't work. Analyze the failure reasons of bearing show that about 40% of the bearing damage is related to bad lubrication. Therefore, good lubrication of the bearing NSK bearings is to reduce the friction and wear of the effective measures. ( 2) The comparison of grease lubrication and oil lubrication NSK bearing lubrication method is roughly divided into two kinds of grease lubrication and oil lubrication. In order to give full play to the function of NSK bearings, it is important to use according to the way and purpose, the lubrication method. ( 3) Grease lubrication grease is composed of base oil, thickener and additive of lubricants. When the choice, should choose NSK bearings is very suitable for conditions of use of embellish grease, because the trademark is different, also there will be a very big difference on performance, so when the choice, must pay attention to. ( 4) The choice according to the working temperature of the grease, grease main indicators should be drop point, oxidation stability and low temperature performance, drop point generally can be used to evaluate the high temperature performance, NSK bearings working temperature should be lower than 10 - drop point 20℃。 The use of synthetic grease temperature should be lower than 20 - drop point 30℃。 ( 5) Oil lubrication under the condition of high speed, high temperature, lubrication has not timely lubrication can be used. Through the circulation of lubricating oil, can take away a lot of calories. Is an important characteristic of lubricating oil viscosity, viscosity directly affect the liquidity of lubricating oil and the size of the friction surface is formed between the oil film thickness, NSK bearings under the working temperature of lubricating oil viscosity is usually 12 - 15cst。 ( 6) Solid lubricant used in some special conditions, adding a small amount of solid lubricant grease, such as adding 1 of 3-5% molybdenum disulphide can reduce wear and improve the compressive strength heat-resistant ability, for high temperature, high, high vacuum, corrosion resistance, resistance to radiation, and the special conditions such as extremely low temperatures, the solid lubricant in engineering plastics and powder metallurgy material, self-lubricating performance can be made with NSK bearing parts, such as the solid lubricant with adhesive bonding on the raceway, cage and rolling body, lubrication film formation, has certain effects on reducing the friction and wear. ( 7) Additional and replacement of a lubricant. The complement of the grease time interval due to mechanical action, aging and the increase of pollution, fill in the NSK bearing configuration of lubrication base will gradually lose its lubrication performance. Therefore, the lubrication rank need to continuously add and update. Lubricant added time interval will be due to the formation of NSK bearings, such as the size and speed and different, according to the running time of general interval to add grease.
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