Bearing in its is in the process of using strong regularity, and repeatability is very good. Normal high quality bearings (ball bearing) when used at the beginning, vibration and noise are small, but some scattered spectrum, amplitude is small, probably due to some defects in the manufacturing process, such as Burr on the surface.
After exercise for a period of time, to maintain a certain level of vibration and noise, spectrum is single, only Yi、erbei. Little more than three times the frequency spectrum, bearing condition is very stable, enter a period of stability.
Continue to run into use late, vibration and noise of rolling bearing starts to build, in some cases, abnormal noise, vibration increases more slowly, however, at this time, bearing kurtosis value suddenly reaches a certain value. We believe that that performance for the early failure of rolling bearings.
(1) size benchmark requirement
The comparative measurement method for measurement of dimensional tolerances of bearing, provided or standard size benchmarks for comparative measurements, which must comply with the provisions of the standard JB/T1078 of the gauge blocks, standard parts must comply with the provisions of the factory authorities.
(2) measurement of the temperature conditions
When measuring the ambient temperature is 20 ° c, standard parts and bearings, blocks, measuring instruments of temperature must be the same, this would place them on the same piece of metal plate temperature balancing methods can be implemented as quickly as necessary, otherwise take several hours or even days to achieve this balance.
In order to get the correct measurement results, rely on measurements of mechanization in foreign countries to avoid staff access to these objects, manipulate or wear insulated gloves.
(3) measuring spindle
Measuring bearing Kia, Kea and Sd projects, for bearings with a cylindrical bore, taper spindle taper provides in principle for one-five thousandth a l/10000, for uranium bearing with a tapered bore, taper spindle taper is one-twelveth.
When rotating bearings, should be very smooth without abnormal noise, and there should be no impurities. Running allowed light in a bearing noise, if the sound is too loud or unusual noise or impact sound, it indicates that the bearing is faulty. Bearing rust anti-rust oil with a slightly scented, but dosage is not. Makes the bearings clean and fragrant.
Bearing at the junction of the horizontal and vertical surfaces with fine chamfers and with black edges.
Bearings in the course of normal use, parts of the bearing housings allow a certain degree of temperature, when shell when touching with the hands, should not feel hot as normal.
If the bearing temperature is too high, you can consider whether the lubricant quality to meet the requirements or deterioration, factors such as the viscosity of lubricant is too high; or install body Assembly is too tight, too tight bearing Assembly; or rolling bearing cage fracture.
Noise of rolling bearings for many reasons, one is the bearing inner and outer rings fit surface wear. Again, insufficient bearing lubrication, the formation of dry friction, as well as the bearing crush generates abnormal noise.


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