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GB/T 24607-2009 English PDF (GBT24607-2009)

GB/T 24607-2009 English PDF (GBT24607-2009)

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GB/T 24607-2009: Rolling bearings -- Test and assessment for life and reliability

This Standard specifies the routine life and reliability test and assessment carried out on test equipment towards the rolling bearings for general purpose, of which d is 5mm - 120mm.
GB/T 24607-2009
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 21.100.20
J 11
Rolling Bearings - Test and Assessment for
Life and Reliability
ISSUED ON. NOVEMBER 15, 2009
IMPLEMENTED ON. APRIL 1, 2010
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine (AQSIQ);
Standardization Administration of China (SAC) of the
People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Symbols ... 4
4 Test Classification ... 6
5 Test Preparation ... 7
6 Test Conditions ... 9
7 Test Procedures ... 11
8 Analysis and Assessment of Test Data ... 12
Appendix A (Informative) Examples of Diagram Estimation ... 18
Appendix B (Informative) Examples of Parameter Estimation ... 20
Appendix C (Informative) Examples of Sequential Test ... 23
Foreword
Appendixes A, B and C of this Standard are informative.
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of the National Technical Committee on Rolling Bearing of Standardization Administration of China (SAC/TC 98). Drafting organization of this Standard. Luoyang Bearing Research Institute. Chief drafting staffs of this Standard. Zhang Wei and Tang Jie.
Rolling Bearings - Test and Assessment for
Life and Reliability
1 Scope
This Standard specifies the routine life and reliability test and assessment carried out on test equipment towards the rolling bearings for general purpose, of which 5mm???d???120mm.
This Standard is applicable to the acceptance of the customers having requirements on life and reliability of rolling bearings; it is also applicable to the verification test in the bearing industry and of the third party certification authority as well as the internal test of the manufacturer.
2 Normative References
The following normative documents contain the provisions which, through reference in this text, constitute the provisions of this Standard. For the dated references, the subsequent amendments (excluding corrections) or revisions of these publications do not apply. However, all parties who reach an agreement according to this Standard are encouraged to study whether the latest editions of these documents are applicable. For undated references, the latest edition of the normative documents referred to applies.
GB/T 275-1993 Shaft and Housing Fits for Rolling Bearings
GB/T 6391-2003 Rolling Bearings - Dynamic Load Ratings and Rating Life (ISO 281.1990, IDT)
SH/T 0017-1990 (Confirmed in 1998) Bearing Oil
3 Symbols
For the purpose of this Standard, the following symbols apply.
b. Shape parameter, the slope parameter of Weibull distribution which
characterizes the dispersion degree of bearing life or the stability of the bearing life quality;
C. Dynamic load ratings of bearing, N;
CI. The best linear invariant estimation coefficient;
DI. The best linear invariant estimation coefficient;
d. Bore diameter, mm;
Fa. Axial load, N;
Fr. Radial load, N;
F(Li). Failure probability;
fh. Life factor;
fn. Speed factor;
Ii. Corrected value of i during incomplete-test;
i. Statistics sequence of actual life arranged from small to large;
j. Statistics sequence of actual life arranged from small to large during incomplete-test;
Li. Actual life of the ith bearing, h;
L . Advance estimate of mean life (intermediate quantity during calculation); L10. Basic rating life, 1000000r;
L10h. Basic rating life, h;
L10t. Test value of basic rating life, h;
L50t. Test value of medium rating life, h;
Mc. Ratio of axial load to radial load;
m. Number of groups in group disqualification test;
N. Sample size;
N?€?. Number of bearings in each group during group disqualification test; N . Number of bearings to replace those used in the test;
n. Bearing test speed, r/min;
nL. Bearing limit speed, r/min;
P. Dynamic equivalent load, N;
Re. Reliability, ( )e e
bL
vR
?€??€? ;
r. Number of failing bearings;
S. Internal axial component of bearing caused by radial load, N;
Ti. Assumed test time (intermediate quantity during calculation),
i j
T L N
??? ????€? ??? ?????? ?????? ;
X. Radial load factor;
Y. Axial load factor;
Z?€?. Quality factor, which is relevant to bearing structure, material and technology; ??. Qualification risk or significance level, 1-?? is confidence coefficient; contact angle, ??;
??. Disqualification risk;
??. Life index (ball bearing ??=3;roller bearing ??=10/3);
??. Proportionality factor, ?? =S/Fr;
????. Acceptance threshold factor;
????. Rejection threshold factor;
v. Scale parameter, the characteristic life of Weibull distribution, which is the bearing life when the failure probability F(L) = 0.632, h;
???i. Position increment of j during the correction of incomplete-test.
4 Test Classification
4.1 Classification by test purpose
According to the test purpose, the tests may be classified into bearing type-identification test, periodic test and verification test, etc.
4.1.1 Type-identification test
The test, when the bearing structure, material or technology is changed, is referred to as the type-identification test. Generally, the complete-test or censoring test method shall be adopted.
4.1.2 Periodic test
For the mass-produced bearings, the quality requirements for the tests that the manufacturer shall periodically provide for the customer are the same as the verification test.
equipment shall idle for 0.5 h, and then the load shall be gradually applied to the designated value within 3 h.
7.3.2 Monitoring of test process
The test equipment generally shall operate continuously. The test (load, speed, oil pressure, vibration, noise and temperature rise, etc.) shall be monitored and controlled within the required range at ant time, and detailed record shall be made. 7.4 Failure judgment
During the test, if the bearing is out of order or cannot operate normally, it shall be judged as failing
7.4.1 Fatigue failure
Fatigue failure is the main failure form of bearing and refers to the base metal on the working surface of the ring or rolling element of bearing sample has fatigue flake. The flaking depth shall be larger than or equal to 0.05 mm; the flaking area. ???0.5mm2 for ball bearing parts and ???1.0mm2 for roller bearing parts.
7.4.2 Other failure
The bearing sample parts are scattered, broken or seized; the sealing element is deformed; the lubricating grease is leaked or dry and hard, etc.
7.5 Acquisition of test data
The sample failure caused by the reason not from bearing (like equipment reason, human reason and accident, etc.) during the test shall not be counted in the normal failure data.
The initial test data (the total test time) shall be recorded and generally shall be accurate to three significant digits.
7.6 Test sample treatment
At the end of the test, the bearing samples shall be properly preserved. Where the customer has requirements, the typical failing sample shall be carried out with failure analysis.
8 Analysis and Assessment of Test Data
For data processing, the data analysis and treatment shall be carried out according to the two-parameter Weibull distribution function, including diagram estimation and parameter estimation, and generally the diagram estimation may be preferred; the processing with few test data or without failure data generally shall adopt the sequential test method.
8.1 Diagram estimation
8.1.1 General diagram estimation
Generally, for the test assessment with at least 6 failure data, the diagram estimation method may be used.
Suppose the abscissa as Li (the test data) and the ordinate as 0.3( ) 0.4i iF L
?€??€? ?€? (the
failure probability)
, and successively plot points on the Weibull distribution diagram, and then prepare the straight distribution line according to the positions of these points. When preparing the straight line, the points shall be distributed on both sides of the straight line staggeredly and uniformly, and deviation between the data points nearby F(Li)=0.3~0.7 and the straight distribution line shall be as small as possible. Obtain the Weibull distribution parameters b and v by the straight line, and then respectively calculate the test value L10t (the Y axis is 0.10) and L50t (the Y axis is 0.50) of basic rating life and the reliability Re. See Appendix A for examples. 8.1.2 Diagram estimation of group disqualification
For the group disqualification test method, the test period may be shortened but the test risk is higher than that of the complete-test and fixed-time (number) censoring test. During the test, if one failing sample appears in each group, the test shall be stopped, and the shortest failure data of each group shall be used to plot points on the Weibull distribution probability paper and also prepare the straight line, and finally calculate the straight distribution line of this batch of samples upon this straight line. See Appendix A for examples.
8.2 Parameter estimation
8.2...

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