[KM bearing knowledge point] Methods to judge the deterioration of grease
Bearing in the process of operation, in order to provide better performance, usually with grease lubrication bearing, can reduce the bearing friction degree and the rise of temperature, if the grease is bad, not only not related to the role of, the use of bearing may actually be worse, so we must learn how to discern when buying grease grease is bad.
Determine the deterioration method of grease:
1. Oil flow observation method
Take two cups, one of which need to be checked out of the lubricating oil, empty on the desktop, the other will be filled with lubricating oil measuring cup for leave desktop 30 to 40 cm tall and lean, let oil flow slowly to the empty cup, to observe the flow situation, when good quality lubricant oil flow should be long and thin, uniform, continuous, if appear oil flow fast and slow, sometimes with large flow, the said lubricating oil has deteriorated.
2. Hand twist
Twist the lubricating oil between the thumb and the index finger repeatedly grinding, the better lubricating oil hand feel lubricity, less abrasive, no friction, if feel between the fingers of sand and other greater friction sense, it shows that the impurities in the lubricating oil, can not be used again, should replace the new lubricating oil.
3. Lighting method
On a clear day, lift the oil with a screwdriver at a 45-degree Angle to the water level. Compare with the sun, observe the oil droplets, under the light, you can clearly see that the lubricating oil without debris is good, can continue to function, if the debris is too much, should replace the lubricating oil.
4. Oil drop trace method
Take a piece of clean white filter paper and drop a few drops of oil on the filter paper. After the oil leaks, if there is black powder on the surface and there is a feeling of astringence when touched by hand, it indicates that there are many impurities in the oil. The good oil has no powder, and it feels dry, smooth and yellow.