GB/T 32321-2015Rolling bearings - Sealed deep groove ball bearings - Performance test rule of dustproofing, grease leakage and temperature rise (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This Standard was proposed by China Machinery Industry Federation.

This Standard shall be under the jurisdiction of National Technical Committee on Rolling Bearings of Standardization Administration of China (SAC/TC 98).

The drafting organizations of this Standard: Luoyang Bearing Research Institute Co., Ltd.

Main drafters of this Standard: Zhang Wei, Zheng Zhigong, Zhang Zhenchao.

1 Scope

This Standard specifies performance test rule of dustproofing, grease leakage and temperature rise for general-purpose sealed deep groove ball bearings (both sides are with sealing rings or both sides are with dust covers), of which the dimensions meet the diameter series 0, 2, 3 in GB/T 276, nominal inner diameter d≤60 mm (hereinafter referred to as sealed ball bearings). The bearings of other types, sizes and size ranges shall refer to this Standard to use.

This Standard is applicable to dustproofing, grease leakage and temperature rise tests for sealed ball bearings on test devices.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

4 Symbols

The symbols given in GB/T 2828.1 as well as the followings apply to this document.

5 Test preparations

6 Test conditions

6.1 Test device is the sealed bearing testing machine that passes regular verification and is verified as qualified.

6.2 Test conditions for bearing sample’s dustproofing, grease leakage, temperature rise performance are selected according to Table 1, Table 2 and Table 3, respectively. Test speed error shall be ≤2%. Test load error shall be ≤2%.

6.3 Test speeds of the bearing samples of other types, sizes series and size ranges shall be selected by referring to Table 1, Table 2 and Table 3. The loads for grease leakage, temperature rise performance tests shall be selected according to 1%~2% of bearing’s basic rated dynamic load.

6.4 Effective space volume of dust medium box for dustproofing performance test shall not be less than 500 mL. The dust-filling amount shall be added according to Table 1. It shall make both sides of bearing sample dusted evenly.

6.5 Rotating direction of dust medium box for dustproofing performance test shall be opposite to bearing sample’s rotating direction.

shall be selected according to the limit speed for contact sealed ball bearings of same dimensions n0.

NOTE: Same as the note in Table 1.

NOTE: Same with the note in Table 1.

7 Test processes

7.1 During the dustproofing, grease leakage and temperature rise performance tests, observe the operation of bearing sample at any time. When there are abnormal vibration, noise and other anomalies, it shall turn off the machine timely.

7.2 Whenever bearing sample fails due to malfunction of test device, instrument or improper operation, it shall take spare samples to carry out the tests in turn again.

7.3 For temperature rise performance test, in general, it shall continuously record the bearing sample’s temperature and ambient temperature.

7.4 For grease leakage, temperature rise performance tests, it shall turn the machine on and off when there are loads.

8 Test results