NSK bearing import when using regular inspection methods

Outside of equipment preventive maintenance, inspection and operation was removed when replacing parts, NSK bearing import to check all to judge can use again, or use of good from bad. Carefully investigate and record the bearing and the appearance of being removed, in order to explore the residual amount of investigation and lubricant, after sampling, to clean the bearing well. Second check the raceway surface, rolling surface and cooperate with the surface condition and wear conditions of cage without damage and anomalies. Judge bearing can use again, and the extent of the damage to consider NSK bearing import, machine performance, importance, and operation conditions, such as inspection period to decide later. Test results, if found damage and abnormal situations, bearing injury section for find out the reason, make the countermeasure. In addition, the test results, there are some defects, if the bearing can't use, need to replace new bearing. 一个。 Inner and outer ring, rolling body, to keep any of them are cracks and debris. b。 Inner and outer ring, rolling body any one strip. c。 Raceway surface, guard, significant injury of roller. d。 Maintains a badly worn or loose rivet badly. e. Raceway surface, rust and roller has a scar. f。 Had a remarkable indentation rolling surface, rolling body and make a mark. g。 Inner ring diameter or outer diameter on the creep. h。 Discoloration of overheating. 我。 NSK import bearing grease seal ring and dust cover damage to serious. ( 1) , check the operation and fault handling operation of check items in bearing rolling noise, vibration, temperature, lubrication condition, such as the specific circumstances are as follows: a, the rolling bearing noise sound device for the size of the rolling sound of import NSK bearing in operation and the quality inspection, bearing even with slight stripping damage, such as would an exception and irregular, and with the sound of the measuring device can distinguish. Two bearing vibration, the vibration of the bearing is sensitive to bearing damage, such as peeling, indentation, rust, crack and wear will be reflected in the NSK import bearing vibration measurement, therefore, through the use of special bearing vibration tester ( Frequency analyzer, etc. ) Can measure the size of the vibration, through frequency points cannot deduce the abnormal situation. Measured values of bearing or sensor installation position and different using conditions, thus requiring prior to each machine is analyzed by the measured value of the determined after judgment standard. Three, the temperature of the bearing temperature of bearing, generally have a bearing on the surface of the outdoor temperature can be predicted, if using the oil hole can directly measure temperature of bearing outer ring, is more appropriate. Usually, NSK import bearing temperature with operation began to slowly rise, 1 - After 2 hours to reach steady state. The normal temperature of bearing for machine heat capacity, heat dissipating capacity, rotational speed and load. If the appropriate lubrication, installation department, the bearing temperature will rise sharply, appear unusually high temperature, must stop at this moment, take the necessary precautions. Based on a lot of test data, table 4 - 1 lists the various kinds of mechanical bearing outer temperature averages at work, for your reference. Due to temperature lubrication, rotational speed, load, the influence of environment, the temperature range of values in the table only said roughly. Using thermal device can monitor the bearing temperature at any time, and realize e. automatic alarm when the temperature is more than the household or stop to prevent the shaft accidents. Synthesis of radial load on the load acting on the ring, the ring raceway on the local area, and preach to the shaft or the corresponding local area of the bearing, the load is called fixed load. Its characteristic is synthetic vector and the relative static ring radial load. Under the ring of directional load can choose loose fit. b。 Rotating load acting on the ring on the synthetic radial load along the circumferential direction, the progressive by all parts, under the load is called rotating load, radial load vector is characterized by synthesis rotate relative to the ring. Under rotating load ring choose the tight fit, under special circumstances, such as load is very light, or under heavy load ring only occasionally low-speed rotation, NSK bearings imported to choose a hard material and surface roughness, higher under rotating load ring also can choose a loose fit. c。 Oscillating load acting on the direction of the synthesis of radial load on the ring, the load case, called oscillating load or directional load, its characteristic is the synthesis of radial load vector acting ring in the ring groove in a certain area of swing, on certain areas for the raceway, or apply to import NSK bearing load is impact load, vibration load, its direction, load values change often. Under oscillating load bearing inner and outer ring with weeks, bearing, hole should be used with tight fit.