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NSK Bearing Routine Inspection

Source:  skf bearing  Time:  2021-01-28

  (1) Temperature conditions during measurement

The ambient temperature during measurement is specified as 20°C. The temperature of NSK bearings, gauge blocks, standard parts and measuring instruments must all be the same. The above method of placing them on the same metal plate can quickly achieve the necessary temperature balance. Otherwise, it will take several hours or even days to reach such a balance.

In order to obtain the correct measurement results, foreign countries rely on the mechanization of measurement to avoid human hands touching these objects, or wearing heat-resistant gloves for operation.

  (2) Regulations of measurement area

For the measurement of the inner diameter or outer diameter of NSK bearings, it is stipulated in China to measure within the area with the largest chamfer coordinate away from the south end of the ring, while in foreign countries, it is often specified as the area leaving the two ends of the ring with twice the chamfer coordinate. Measure within.

  (3) Dimension standard regulations

When using comparative measurement method to measure the dimensional tolerance of NSK bearings, the gauge block or standard part is specified as the size benchmark for comparison measurement. The gauge block must meet the requirements of the standard JB/T1078 "Gauge Block", and the standard part must conform to the manufacturer's supervisor Departmental regulations.

  (4) Regulations for measuring instruments

The instrument used in the measurement must be calibrated and have the accuracy and amplification ratio that are compatible with the measured NSK bearing.

  (5) Allowable measurement error

In principle, the allowable measurement error is less than 10% of the tolerance.
Eric Bearing LTD provides high quality NSK Bearings of
HR30205J.

  (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 within the possible range and increase the radius of curvature of the probe.
When measuring the inner diameter and outer diameter of NSK bearings, the measuring force and the radius of curvature of the probe can be selected by reference.

  (7) Mandrel used for measurement

When measuring the Kia, Kea and Sd items of NSK bearings, for cylindrical bore NSK bearings, the taper mandrel used is in principle specified as 1/5000-1l/10000. For tapered bore uranium bearing, the basic taper mandrel used The taper is specified as 1/12.

  (8) Regulations for measuring load

When measuring Kia, Kea, Sia, Sea and other items, it is necessary to apply the necessary measurement load to make the rolling element and the ring in the normal contact position to obtain a stable measurement value.

  (9) Provisions for the measurement reference surface

For general rolling NSK bearings, take the non-printed end surface of the ring as the reference surface during measurement, and take the end surface bearing the thrust load as the reference surface for angular contact ball NSK bearings and tapered roller NSK bearings.

When inspecting NSK bearings, never expose NSK bearings to pollutants or moisture. If work is interrupted, the machine should be covered with greased paper plastic sheet or similar material.

If the unmasked NSK bearing is cleaned without disassembly and inspection is possible, it should be cleaned with a white spirit with a coating brush, and then wiped dry with a lint-free cloth or blown with compressed air. Dry (be careful not to start rotating the NSK bearing assembly).

Use a small mirror and a probe similar to that used by dentists to inspect the track surface, retainer and beads of the NSK bearing. If the NSK bearing is not damaged, it should be relubricated according to the lubrication instructions provided by the machine manufacturer.

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