Conditional maintenance of imported bearings for routine inspection

1. Temperature conditions during measurement
The ambient temperature during measurement is specified to be 20 ° C. The temperature of the imported bearings, gauge blocks, standard parts and measuring instruments must be the same. The above method of placing them on the same metal plate can achieve the necessary temperature balance as quickly as possible. Otherwise it takes hours or even days to reach this balance.
In order to get the correct measurement results, foreign countries rely on mechanization of measurement to avoid touching the objects by hand or wearing insulated gloves.
2. Measurement area regulations
For the measurement of the inner diameter or outer diameter of the imported bearing, the domestic regulations are measured within the area away from the south end face of the ferrule, which is a maximum chamfering coordinate, while the foreign country is specified as the area with twice the chamfering coordinates on both ends of the ferrule. Measured within.
3. Specification of the size basis
In the comparison measurement method, the dimensional tolerance of the imported bearing is measured. The specified mass or standard part is used as the dimensional reference for the comparative measurement. The measuring block must meet the requirements of the standard JB/T1078 "Quantity Block", and the standard part must conform to the manufacturer's supervisor. Departmental regulations.
4. Measurement instrument specifications
The meter used for the measurement must be calibrated and have an accuracy and magnification that is compatible with the imported bearing being tested.
5. Allowable measurement error
In principle, the measurement error can be tolerated below 10% of the tolerance.
6. Probe radius and gauge pressure
In order to reduce the measurement error, it is necessary to reduce the pressure-measurement force of the gauge and increase the radius of curvature of the probe to the extent possible.
When measuring the inner and outer diameters of the inlet bearing, the measured force and the radius of curvature of the probe can be selected.
7. Measuring the mandrel used
In the measurement of Kia, Kea and Sd of imported bearings, the taper of the taper mandrel used for cylindrical bore bearings is defined in principle as 1/5000 to l/10000. For tapered bore uranium, the basic of the taper mandrel used. The taper is specified as 1/12.

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SKF bearing three common maintenance techniques

When there is a problem with SKF bearings, the first idea should be to check the repair, not to replace it. Today, we introduce the common types of repairs for the world's top SKF bearings.
There are three types of normal bearing repairs:
1. Fault repair: When the SKF bearing fails, stop the inspection and repair.
2. Regular maintenance: In order to ensure the normal operation of the mainframe, according to the requirements of the mainframe and the design theory and experience of the bearing, set a maintenance cycle and regular maintenance.
3. Early warning maintenance: Using advanced SKF bearing fault diagnosis technology, real-time monitoring of the use status of SKF bearings, forecasting and repairing before bearing failure.
During the operation of SKF bearings, there must be phenomena such as sound, temperature and vibration. Therefore, for the maintenance of the running bearing, it is possible to find the abnormal change of the bearing by listening, touching, observing, and using a bearing fault diagnosis instrument, and judging whether the bearing is in a normal working state according to the changed state.

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