Regular inspection of bearing

1. The provisions of the measurement region

For measuring the bearing inner or outer diameter of the provisions of the domestic automotive bearings measure within the southern boundary lubricating bearings leave ferrule end faces are each a maximum chamfer coordinate area, and many foreign countries defined as leaving the ferrule end faces are each twice inverted within the measurement area corner coordinates.

2. The size of the reference provisions

In conducted using comparative measurements of bearing size male non-oil lubricated bearings difference measurement, predetermined amount of block or standard as a comparative measure of the size of the base, wherein the amount of blocks must comply with the standard JB / T1078 "Block", the standard must comply with the manufacturer authorities.

3. The measurement conditions of temperature

Ambient temperature measurement is specified as 20 ℃, which bearing, in blocks, standard temperature and measuring instruments must be the same as the above put them in the same way a metal plate on the fastest way to achieve the necessary temperature balance, otherwise It takes hours or even days to achieve this balance.

4. The allowable measurement error

In principle permissible measurement error tolerance of 10% or less.

5. The probe radius and pressure measurement table

In order to reduce measurement errors, it must be within the range of the possible, and strive to reduce the pressure gauges - the measuring force and increase the radius of curvature of the probe.

When measuring the bearing inner and outer diameters, the use of force and the measured radius of curvature of the probe can be selected reference.

6. The provisions of measuring instruments

When used for the measurement instrumentation must be calibrated, and has adapted to the measured bearing accuracy and zoom ratio.

7. The mandrel used for the measurement

Basic taper specified when measuring bearing Kia, Kea and Sd projects, for cylindrical bore bearings, the use of the provisions of the taper principle taper spindle 1/5000 a l / 10000, for tapered bore uranium bearing, the taper spindle with 1/12.

8. The provisions measuring datum

For general bearing, non-printing end surface of the ferrule take measurements as a reference surface for the angular contact ball bearings and tapered roller bearings, thrust load to bear take end surface as the reference surface.

9. Measure load requirements

When measuring Kia, Kea and Sia, Sea projects, apply the necessary measuring load, the rolling bodies and rings in normal contact position, in order to obtain stable measurements.