Whether INA bearings can continue to be used is the degree of damage according to various needs, and the main consideration in this regard is the effect of damage. For mechanical performance, importance, installation conditions are considered, to the next time. The effect determined during the inspection period, but in the case where the defect cannot be used, it is necessary to replace the new electric spindle bearing. For the inner ring, the outer ring, the rolling element, and the cage, there is a crack in the crack. Note that this is also an effect that is maintained in this regard.
After the INA bearing is subjected to a load, plastic deformation occurs at the contact between the rolling element and the raceway. When the load is too heavy, plastic deformation pits will be formed on the surface of the raceway, and the electric spindle bearing will generate vibration and noise during operation.
Due to the relative movement of the rolling elements and the raceways and the intrusion of dirt and dust, the rolling bodies and the raceway surfaces are subject to wear. When the amount of wear is large, the bearing clearance, noise, and vibration are increased, which reduces the running accuracy of the bearing, and thus directly affects the accuracy of some main engines. Therefore, for some precision mechanical bearings, the amount of wear can be used to limit the life of the bearing.
1. Measurement area specification: For the measurement of the inner diameter or outer diameter of the INA bearing, the domestic regulations are measured within the area of the south end of the ferrule which is a maximum chamfering coordinate, while the foreign regulations are specified on both ends of the ferrule. Measured within the area of double chamfering coordinates.
2, the specification of the size reference: in the measurement of the dimensional tolerance of the electric spindle bearing by the comparative measurement method, the specified amount block or standard part is used as the dimensional reference for the comparative measurement, wherein the measuring block must meet the requirements of the standard JB/T1078 "Quantity Block" The standard parts must comply with the regulations of the competent authority of the manufacturer.
3. Temperature conditions during measurement: The ambient temperature during measurement is specified as 20 °C. The temperature of the INA bearing, gauge block, standard parts and measuring instrument must be the same. The above method of placing them on the same metal plate can be the most. Quickly achieve the necessary temperature balance, otherwise it will take hours or even days to reach this balance.
4. Permissible measurement error: In principle, the measurement error can be tolerated below 10% of the tolerance.
5. 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 within the possible range. When measuring the inner and outer diameters of the electric spindle bearing, the measuring force and the radius of curvature of the probe can be selected.
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