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NSK bearing grease stability - bearing the importance of knowledge

by:Waxing     2020-05-26
NSK bearings in general, the amount of grease filling, always exceeds the actual requirements, directly involved in the lubrication of the rack and the bearing cover cavity, and forms an outline in rolling around in vitro. In this process, due to excess grease resistance, bearing temperature rise quickly. Although most redundant grease at the beginning of the operation is being squeezed out, and squeezed in the raceway attachment grease could still be turning into the groove between roller. Most of these in the early stages of the bearing grease quickly ( Less than a minute) Is being squeezed out of raceway and the accumulation in the grease in the bearing rotation of systemic circulation at the same time, have a small amount of discharge. Bearing (degrees still continues to rise at this moment, until the redundant grease were discharge, may be called the grease running-in stage, according to the structure of the bearing grease factors such as quality, filling quantity, this paragraph of time can last more than ten minutes, or even a few hours. Bearing grease is completely after discharge, the rest of the rest of the small amount of grease in the rolling element and raceway, keep contact with each other, cadastral wedge formed by a thin film of grease, so as to enter the bearing of the normal phase. The temperature decrease and balance. That is to say, the long-term lubrication, mainly rely on the film of grease. In addition, in the process of bearing long-term operation, rolling element and raceway profile near detachments and keep on the shelf to atrophy and grease base oil, flow into the race, between supplement to lubrication also to have certain effect. Different bearing grease in the bearing form outline to traffic is not the same, must form the contour comparison is, shorter running-in time, bearing temperature is low, in the long-term operation and smooth, this is a kind of ideal grease, so is especially important for into the canal of grease. Some so-called vortex type grease is not, is not easy to form the outline, even form the contour is easy to collapse, then roll back to the redundant grease in the tiny repeatedly chronically stirred by strong column, bearing torque is big, high temperature, and uneven, also may produce noise, grease also easy metamorphism and erosion. NSK bearings temperature processing, as the bearing temperature rise first determines whether the misoperation, as did rise, should do the following treatment: ( 1) 。 Check the cooling water pressure, water flow and pipeline system is normal. If water is likely to be lower filter blockage, cannot be handled in a timely manner, to stop treatment, when confirm can work, then put into use. ( 2) 。 Should be to check if the governor oil pressure, oil pressure is low can lead to cooling water hydraulic valve closed. ( 3) 。 Check for different bearing, NSK bearings bearing pendulum and testing whether there are abnormal. ( 4) 。 Take oil whether there is a change of color, sample observation and test to see whether metamorphism. If confirm the degradation new oil should be replaced downtime. ( 5) 。 Check the oil standard oil level is normal, if abnormal, check that the sump oil discharge valve is shut. If the matter, should fill oil, if is the sealant mat permeability oil, should stop processing. When we are in the use of NSK bearings, if it is found that the temperature is very high, is to stop the equipment running, and find out its reason, and provide solution for processing according to the above, but may be due to the reason of bearing heating is different, so the solution is also different, so still have to treat, particular case is particular completed with the help of the technical staff.
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