GB/T 24607-2023 English PDF (GBT24607-2023)

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GB/T 24607-2023: Rolling bearings -- Test and assessment for life and reliability
GB/T 24607-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
CCS J 11
Replacing GB/T 24607-2009
Rolling bearings - Test and assessment for life and reliability
ISSUED ON: DECEMBER 28, 2023
IMPLEMENTED ON: APRIL 01, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Symbols ... 6
5 Principle of test for life and reliability ... 8
6 Test classification... 8
7 Test equipment ... 9
8 Sample ... 10
9 Test conditions ... 10
10 Test steps ... 13
11 Test data analysis and assessment ... 15
12 Test report ... 20
Annex A (informative) Example of figure estimation data processing ... 22
Annex B (informative) Examples of data processing using best liner invariant
estimation ... 31
Annex C (informative) Examples of sequential method data processing ... 35
Bibliography ... 37
Rolling bearings - Test and assessment for life and reliability
1 Scope
This document describes the routine test for life and reliability and assessment methods
of general-purpose rolling bearings with bearing inner diameters (d) of 5mm~180mm
on testing equipment.
This document is suitable for product quality acceptance, product quality comparative
analysis and evaluation of users who have requirements for rolling bearing life and
reliability. It is also suitable for verification testing, project acceptance, assessment and
evaluation by the bearing industry and third-party certification agencies, and internal
testing of the manufacturing plant.
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 275-2015, Rolling bearings -- Fits
GB/T 6391-2010, Rolling bearings -- Dynamic load ratings and rating life
GB/T 6930, Rolling bearings -- Vocabulary
GB 11118.1-2011, Hydraulic fluids of L-HL, L-HM, L-HV, L-HS and L-HG type
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 6391-
2010 and GB/T 6930 as well as the followings apply.
3.1 test for life
A test conducted to estimate or verify product life.
3.2 test for reliability
A test conducted to measure, evaluate, analyze and improve product reliability levels.
3.3 failures of rolling bearing
Rolling bearings are unable to meet predetermined design performance requirements
due to defects or damage.
3.4 figure estimation
A method of parameter estimation with the help of Weibull probability plots.
3.5 best liner invariant estimation
A numerical calculation method that uses tables to estimate parameters using the best
linear invariant estimate.
3.6 sequential method
A method of analyzing and judging test data one by one based on sequential tests.
3.7 confidence interval
The estimated interval of the population parameter constructed from the sample statistic
is numerically equal to the difference between the upper confidence limit and the lower
confidence limit of the parameter estimate.
3.8 conformity assessment
Demonstration that specified requirements related to a product, process, system, person
or organization are met.
[Source: GB/T 27000-2023,3.1, modified]
4 Symbols
The following symbols apply to this document.
b: Shape parameter, slope parameter of Weibull distribution, indicating the degree of
dispersion of bearing life or the stability of bearing life quality
C: Basic dynamic load rating, N
CI: Best linear invariant estimation coefficient
DI: Best linear invariant estimation coefficient
d: Bearing inner diameter, mm
Fa: Axial load, N
Fr: Radial load, N
α: Accepted risk or significance level;1-α is the confidence level
β: Failure risk
η: Proportional coefficient
μα: Acceptance threshold coefficient
μβ: Rejection threshold coefficient
ν: Scale parameter, the characteristic life of Weibull distribution, which is the bearing
life when the failure probability F (L) =0.632, h
5 Principle of test for life and reliability
Test the same batch of bearing samples under the same test conditions. Count the
number of revolutions or time that the bearing can operate normally. Apply the
corresponding evaluation method to process the test data to determine the life reliability
parameters of this batch of bearing products.
6 Test classification
6.1 Tests are divided according to test methods and test purposes.
6.2 According to the test method, the classification is as follows.
a) Complete test method: a set of bearing samples are tested to failure.
b) Censoring test method: a set of bearing samples are tested to a predetermined time
or to partial failure. Censoring test methods are further subdivided into the
following three types:
1) Timed censoring test: a set of bearing samples are tested and the test is stopped
at a predetermined time;
2) Fixed-number censoring test: a set of bearing samples is tested until the
predetermined number of rejected sets is reached; generally, the number of
rejected sets shall not be less than 2/3 of the bearing sample size (at least 6 sets
shall be guaranteed);
3) Group elimination test: a set of bearing samples are randomly divided into
groups, and the test is stopped until one rejected sample appears in each set.
c) Sequential test: a set of bearing samples are used to judge the samples that are
stopped according to the rules one after another. Generally, the number of rejected
sets does not exceed 5 sets.
6.3 According to the purpose of the test, the classification is as follows:
a) Verification test: a test used for product acceptance by users and verification by
third-party certification agencies. Generally, censoring tests or sequential tests are
used;
b) Periodic test: for bearings used in mass production, manufacturers must provide
testing to users on a regular basis. The quality requirements are the same as
verification testing;
c) Qualification test: a test that needs to be carried out when the bearing structure,
material, and process are changed. Generally, a complete test or a truncation test
is used.
7 Test equipment
7.1 General requirements
7.1.1 The test equipment shall be a bearing life testing machine whose performance
parameters can meet the usage requirements or performance assessment capabilities
and which have been regularly calibrated. The test equipment shall have some
necessary monitoring means during the test process, such as monitoring of rotation
speed, load, temperature, vibration, lubrication and other parameters.
7.1.2 The same batch of bearing samples shall be tested on testing equipment with the
same main structure and performance parameters.
7.1.3 Comparative tests of bearing samples of the same structural type and the same
outer dimensions shall be conducted on test equipment with the same main structure
and performance parameters.
7.2 Tolerance zone requirements for test spindles and bearing housing holes that
fit with bearings
7.2.1 When the inner ring of the bearing rotates and the outer ring is fixed, the tolerance
zone of the test spindle and the bearing seat hole that matches the bearing is
recommended to be selected according to...