Improper way can also cause NTN bearing heating. Through the lubrication can reduce in the movement of wear parts, ensure the precision press and reduce energy consumption. Lubricating points thin oil lubrication, strong oil lubrication, etc. Thin oil lubrication: internal friction coefficient advantage is small, so to overcome the friction less energy consumption, thin oil flow is good, easy to enter all lubricating points of friction surface, have good cooling effect, can will adhesion in the friction surface grinding and impurities and because produced metal particles away. Defect is oil film unable to bear large unit pressure, to seal requirements high. The press is used more general big flow thin oil lubrication, can take away the friction pair heat generation.
 
1, overflows observation
Take two cups, one of which filled the lubricating oil need to be checked out, and the other an empty on the desk, will be filled with oil's cup lifted from 30-40 cm desktop and tilt, let the oil flow to the empty cup slowly, observe the flow condition, quality good oil duct is a slender, should be uniform, continuous, if appear, fast and slow commercial, or down large, the said oil already metamorphism.

2, the hand of fine twined
Will lubricating oil in his thumb and forefinger twined between repeated grinding, a good oil hand feel lubricity, honing, no less friction, if feel the sand between fingers and friction are larger, indicates that lube more impurities, should replace new lubricating oil.

3, illumination method
When the weather is fine day, with a screwdriver will lubricating oil pulled up, and the horizontal plane into 45 degree Angle. Controlled sunshine, observation oil droplets, on the illumination, can be clear to see no oil honing for good, can continue to use, if too many honing, should be replaced lubricating oil.

4, oil droplets trace method
Get a clean white filter paper, drops of oil in few drops of filter paper, wait for after oil leakage, if the surface has black powder, touch have resistance acerbity feeling, show lubricating oil has many impurities inside, good oil without powder, with the hand feels dry and smooth, and yellow trace.




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