GB/T 32325-2015 English PDF (GB/T32325-2015)

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GB/T 32325-2015: Rolling bearings -- Specifications for vibration (velocity) of deep groove ball bearings
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.