GB/T 32325-2015 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 32325-2015 | English | 115 |
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Rolling bearings - Specifications for vibration (velocity) of deep groove ball bearings
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GB/T 32325-2015: Rolling bearings - Specifications for vibration (velocity) of deep groove ball bearings
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT32325-2015
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
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. Hangzhou Bearing Test Research
Center Co., Ltd., Jinfa Bearing Co., Ltd., National Small and Medium-sized
Bearing Product Quality Supervision and Inspection Center, Tianma Bearing
Group Co., Ltd., Zhejiang Wuzhou Xinchun Group Co., Ltd., Zhejiang Chentong
Bearing Co., Ltd., Zhejiang Times Metrology Technology Co., Ltd.
Main drafters of this Standard. Chen Fanghua, Yan Sisi, Li Xianhong, Qian
Yaming, Shi Dafang, Shi Zhexi, Zheng Xiaopeng, Chen Jianxin, Kang Pengfei.
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
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.
4 Group codes
The codes in JB/T 2974 as well as the following vibration group codes apply to
this document.
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.
6 Measurement methods
6.1 Measurement methods shall comply with the provisions of GB/T 24610.2.
6.2 The radial and axial circular runout after mandrel and spindle are combined
shall not be greater than 5μm. The measurement methods are in accordance
with the provisions of Annex A.
7 Evaluation methods
7.1 Under the specified measurement conditions, after making the bearing
vibration reaches a stable state and run for 1s, start the measurement. The
measurement duration is 2s~5s. Read the measurement value in this state
corresponding to each measurement point position.
7.2 Select 3 measurement point positions where the outer cylindrical surface of
the bearing outer ring is approximately equidistant to measure. Conduct
positive and negative measurements.
7.3 When in dispute, use NY-120 solvent oil to effectively clean the non-pre-
lubricated bearings.
8 Inspection rules
8.1 The individual bearing is measured according to the method specified in
this Standard. When the vibration velocity value in any frequency band is
greater than the corresponding group limit in Table 1, this bearing shall be
rejected.
8.2 When conducting the sampling inspection for vibration of a batch of
bearings, according to the provisions of GB/T 2828.1, it shall use primary
sampling scheme of normal inspection and general inspection level II. The
acceptance quality limit (AQL) of vibration velocity shall be 1.5.The AQL of crest
factor of vibration velocity or the peak value of vibration velocity shall be 4.0.
Annex A
(normative)
Measurement methods for radial and axial circular runout of mandrel
As shown in Figure A.1, after the mandrel and the spindle are combined, place
the probe of the measuring meter 1 vertically on any part of the mating surface
of the mandrel and the bearing bore and place the probe of the measuring
gauge 2 vertically on any part of the shoulder end face of the spindle.
Annex B
(normative)
Measurement method for basic vibration of driving device
As shown in Figure B.1, on the support platform of driving device of bearing
vibration measurement, place a rigid basic vibration measurement rod (cast iron
or steel; the parallelism of its two end surfaces shall not be greater than
0.01mm). Make the sensor probe in contact with the upper end face of the basic
vibration measurement rod. The contact force shall be the contact force of
sensor during bearing vibration measurement. Start the spindle. Set the range
switch of the electronic measurement instrument (if available) to the minimum
position. At this time, the indicated value of the low, medium and high frequency
bands of the electronic measurement instrument shall be the basic vibration of
driving device.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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