Standards related to:

GB/T 32325-2015**GB/T 32325-2015: PDF in English (GBT 32325-2015) **

GB/T 32325-2015

NATIONAL STANDARD OF THE

PEOPLE’S REPUBLIC OF CHINA

ICS 21.100.20

J 11

Rolling bearings - Specifications for vibration

(velocity) of deep groove ball bearings

ISSUED ON: DECEMBER 31, 2015

IMPLEMENTED ON: APRIL 01, 2016

Issued by: General Administration of Quality Supervision, Inspection and

Quarantine;

Standardization Administration of the People's Republic of

China.

Table of Contents

Foreword ... 3

1 Scope ... 4

2 Normative references ... 4

3 Terms and definitions ... 5

4 Group codes ... 5

5 Technical requirements ... 5

6 Measurement methods ... 6

7 Evaluation methods ... 7

8 Inspection rules ... 7

Annex A (normative) Measurement methods for radial and axial circular runout

of mandrel ... 9

Annex B (normative) Measurement method for basic vibration of driving device

... 10

Rolling bearings - Specifications for vibration

(velocity) of deep groove ball bearings

1 Scope

This Standard specifies technical requirements, measurement methods,

evaluation methods and inspection rules for vibration (velocity) of deep groove

ball bearings of which nominal outer diameter is greater than 10mm ~ 200mm,

and the dimensions are in accordance with 0, 2, 3 diameter series of GB/T 276

(hereinafter referred to as the bearings).

This Standard is applicable to deep groove ball bearings, in which the specified

group V is the basic requirements for general bearing vibration (velocity),

groups V1, V2, V3, V4 as well as groups VF3, VF4 are applicable to the

bearings that have higher requirements for vibration (velocity) and groups VF3,

VF4 are only applicable to the bearings of which the nominal outer diameter is

greater than 10mm ~ 100mm.

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.

GB/T 276, Rolling bearings - Deep groove ball bearings - Boundary

dimensions

GB 443, Lubricating Oils for Total Loss Systems L-AN

GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1:

Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot

inspection

GB/T 24610.1, Rolling bearings - Measuring methods for vibration - Part 1:

Fundamentals

GB/T 24610.2, Rolling bearings - Measuring methods for vibration - Part 2:

Radial ball bearings with cylindrical bore and outside

JB/T 2974, Rolling bearing - Identification code - Supplemental regulations

SH 0004, Solvent oil for rubber industry

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB/T

24610.1 as well as the followings apply.

3.1 peak value of bearing vibration velocity

The maximum value of bearing vibration speed within a given time interval.

3.2 crest factor of bearing vibration velocity; F

The ratio of the peak vibration speed of the bearing to the root mean square

value of the vibration speed within a given time interval.

4 Group codes

The codes in JB/T 2974 as well as the following vibration group codes apply to

this document.

F: the crest factor of low-frequency vibration velocity is not greater than 4; the

crest factor of high-frequency vibration velocity is not greater than 6;

VF3: the vibration velocity reaches group V3 and the crest factor of vibration

velocity reaches group F;

VF4: the vibration velocity reaches group V4 and the crest factor of vibration

velocity reaches group F.

5 Technical requirements

5.1 The vibration velocity of individual bearing shall not exceed the

corresponding group limit specified in Table 1.

5.2 For groups VF3, VF4 bearings, in addition that the vibration velocity of

individual bearing shall not exceed the corresponding group limit specified in

Table 1, the crest factor of vibration velocity shall also meet the requirements of

group F. When using peak value of vibration velocity, the peak value of low-

frequency vibration velocity shall not be greater than 4 times the vibration

velocity. the peak values of medium-frequency and high-frequency vibration

velocities shall not be greater than 6 times the vibration velocity.

......

Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.