This standard specifies the fatigue performance test methods for precision roller chains and bushing chains used in power transmission. This standard applies to fatigue performance testing of roller chains and sleeve keys. Other similar chain products can also be implemented as a reference. JB/T 5387-1991 Test method for fatigue performance of roller chain and sleeve chain segments JB/T5387-1991 Standard download and decompression password: www.bzxz.net

Machinery Industry Standards of the People's Republic of China
Roller chain and bush chain
Chain segment fatigue performance test method
Fatigue test method for roller and bush ehrains Subject content and scope of application||tt ||This standard specifies the fatigue performance test method of precision roller chains and sleeve chain segments for power transmission JB5387--91
This standard is applicable to the fatigue performance test of roller chains and sleeve chains. Other similar chain products can also be implemented with reference. 2 Reference standards
GB3360 Statistical processing and interpretation of data Estimation and confidence interval of mean GB 9785
Chain and sprocket terms
3 Terms, definitions and units
Power The terminology of transmission chains is specified in GB9785. The symbols, terms, definitions and units related to fatigue testing are listed in Figure 1 and Table 1. Figure 1
Table 1
technical
Sm
5
load
language
maximum load||tt| |Minimum load
Li
The load acted by the testing machine on the soil of the chain segment
The maximum value in the cyclic load change
, the minimum value in the cyclic load change|| tt||Ministry of Mechanical and Electronic Industry of the People's Republic of China approved 50 on June 25, 1991
Single
kN
kN
k.
Institute|| tt||1992-07-07 Implementation
S
N
R
Sp
4 test samples
Technology||tt ||language
average load
load amplitude
load cycle characteristic coefficient
cycle frequency
number of cycles
reliability||tt ||Conditional fatigue limit load
Fatigue limit load
JB 5387- 91
Continued Table 1
Defined
Sm=(Smx+Sm)/ 2
S, =(Smax \-Smin>/2
-Smin
meaning
The number of changes of cyclic load per unit time when the specimen is under the action of cyclic load The probability that the specimen will not cause fatigue damage under the specified conditions and within the specified number of load cycles
corresponds to the fatigue load R=50% of the N cycles specified by T
corresponds to the specified R50% fatigue load of N=5×10° cycles
kN
kn
H
times
%
kN
kv
4.1 The test sample is a chain segment composed of 5 links, including 3 inner links and 2 outer links. The two ends of the chain segment are inner links, 4.2 The specimen should be cleaned before testing.
5 Test conditions
5.1 Different types of axial fatigue testing machines can be used during the test: 5.1.1 Static load indication error. The range is ±1%. The fluctuation range of the static load indication is ±1%. 5.1.2 Within 10 hours of continuous testing, the fluctuation range of the average load indication is ±1% of the load amplitude indication. The range is ±2% of the maximum load.
5.2 The cycle frequency is within the range of f-10 ~ 200Hz. At the same load level, the test of the same batch of specimens should be carried out on the same testing machine. The cycle frequency should be roughly the same. 6. The connecting fixture of the chain segment and the testing machine
6.1 The connecting fixture should be designed according to the specification series of the corresponding sample. See the appendix ((reference part) for its specific structural type. 6.2 The connecting fixture should ensure The test chain segment does not produce additional loads, and the coordination between the pin hole and the pin connecting the clamp and the chain segment is H9/h8. 6.3 The width of the inner gear of the clamp connecting to the inner chain link should refer to the outer diameter of the corresponding chain specified in the product standard. Chain links allow for a minimum internal width gauge design.
6.4 It is recommended to use multi-row chain pins of the same specification as the sample to connect the sample and the fixture. The pin is specified for one-time use. 6.5 It is recommended that the pin hole connecting the clamp and the chain segment be strengthened. 7 Test procedure
7.1 Load cycle characteristic coefficient, which should be 0.1 to 0.2. Samples of the same batch with the same specification should have the same r value during the test. 7.2 When applying load, it should be applied steadily and slowly. The applied load value should be accurate and must not be overloaded. 7.3 Termination of test
7.3.1 The specimen shall be tested continuously under the specified load until the specimen fails or the specified number of cycles. JB-5387-97
7.3.2 The judgment of chain segment fatigue failure is based on a sharp change in cycle frequency or cyclic load. 7.3.3 When the test is terminated due to the clamp or pin connecting the chain segments, the test is invalid. 7.4 Determination of condition fatigue limit load S and fatigue limit load S The condition fatigue limit load or fatigue limit load of the chain segment is measured according to the lifting method, see Appendix A (reference part) 7.5 Determination of SN curve and RSN curve
SN curve or RSN curve of the chain segment. The fourth and fifth load levels should be selected, and S or Sr should be measured according to the lifting method as the lowest load level point of the S·N curve or RSN curve. The distribution of the number of specimens at each load level should increase as the load level decreases.
7.5.1 Determination of S-N curve
Determine the minimum tensile load Q. Take at least three samples for tensile testing and take the average value; a.
b.| | tt | level; d. It is determined that the intervals between the load levels at each level can be slightly larger at the highest load level. As the load level decreases, the intervals are appropriately reduced, and the differences between the load levels at each level can also be equal;
Select the number of specimens at the highest load level At least 3 specimens should be selected under each load level, and the minimum number of specimens required for each load level shall not be lower than the specified value in Table D1 of Appendix D (Supplement); f. Determine the load cycle characteristic coefficient r according to the provisions of Article 7.1; g. The test record is filled in according to Table B1 of Appendix B (Reference Parts); h. The SN curve is drawn according to the provisions of Article 7.5.3. 7.5.2 Determination of R-SN curve
Selection of the number of specimens At least 5 specimens should be selected at the highest load level, and the minimum number of specimens required for each load level is a.
shall not be lower than the specified value in Table D1 of Appendix D
b. To determine the reliability R, test the same batch of samples under the same load level to failure, and arrange them in ascending order of cycle times as follows:
NNAANAN
Each N is called sequence statistics Quantity, and its corresponding reliability is: R1-i/(n + 1)
1 1.2,
i is the ordinal number arranged in order from small to large, corresponding to each The reliability R values ??of i and n are listed in Appendix D, Table D2; for the test data measured at various load levels, the corresponding relationship between R and N can be obtained using the above method, and the relationship between them can be found.
The number of cycles N at each load level corresponding to the reliability R; d. The RSN curve is drawn according to the provisions of Article 7.5.3; e. The rest shall be in accordance with the relevant provisions in Article 7.5.1. 7.5.3 Drawing method of S-N curve and RSN curve. The two curves are drawn with the common logarithm IgS of the load S as the ordinate and the common logarithm igN of the number of cycles N as the abscissa. Use the least squares method to perform curve fitting on the SN curve and the RSN curve and perform regression analysis and correlation testing. Illustrations of SN curves and RSN curves are shown in Figure 2.
52
8
Test data processing and test report
Igst
RsN
Curve
JB5387||tt ||91
SN curve
Figure 2 S-N curve and RSN oil line legend
N
8.1 Fatigue test data should be processed using mathematical statistics methods. It is recommended to refer to GB3360 for analysis and processing. 8.2 For the original records of test data and the format and content of the test report, please refer to the appendix (reference document). 53
JB 5387-91
Appendix
Ａ
Lifting method
(reference)
Take at least 12 A1 samples Valid chain segment. The test starts at a load level slightly above the expected fatigue limit and then decreases in steps, as shown in Figure A1.
at load S.Under the influence, test the first sample. If the sample fails before reaching the specified number of cycles NV, the first sample will be tested under the lower load S, ". Until the fourth sample is tested, if the sample is under S : There is no failure (exception) after N cycles, and the fifth sample in sequence will be tested under the advanced load S, in this way. If the previous sample fails within N load cycles, then The subsequent tests shall be carried out at a lower load level: if the previous specimen exceeds the limit, the subsequent tests shall be carried out at a higher load level until all tests are completed. The difference ΔS between load levels at each level is called "load increment", which is generally taken as AS ≤ 5% Sr (Sp). During the entire test process, the load increment remains unchanged when processing the test results. If the previous data with opposite results are outside the fluctuation range of future test data, they will be discarded. The calculation formula of fatigue limit:
S
where: n—
-the total number of effective tests;
m----Test load level series;
S,—the i-th load level;
vs
th: load level S, lower Number of tests. The above formula shows that S is the weighted load average weighted by the number of tests. Figure A1 Lift diagram
Specified number of cycles N-5×10°; (Al | tt||S.
kNWww.bzxZ.net
IB 5387 -91
Appendix B
Test original data record and test report format (reference)
Table B1 test original data record
Testing unit
Test purpose
Ambient temperature
Original data record
Load amplitude
s.|| tt | |Times
Tester
Test period
Entrusted testing unit
Sample specifications
Sampling status and quantity
Name of testing machine and number
Test frequency range
Ambient temperature
Test start and end date
Fatigue limit load
SN curve or RSN curve
Test conclusion :
Testing unit conclusion:
JB 5387--91
Table B2 test report
Testing unit

materials on test day And 7 technical characteristics
Testing machine static calibration accuracy and load fluctuation degree
Load cycle characteristic tight number
Ambient relative humidity
Supervising engineer (signature)||tt| |Supervisory unit (signature)
year
year
month
month
E
H
JB 5387 —91 | The structural type of the fixture used for the fatigue test of connecting more than three rows of chain segments can also be designed with reference to Figure C1. Figure Ci fixture structural type
37
Supervisor reliability
.95%
Coefficient of variation D/X range
Small
0.0201
0. 020 1 -~ 0. 031 4
0. 031 4~0. 010 3
0. 040 3-- 0. 047 6
0. 047 6-~ 0. 054 1
0. 054 1 ~ 0. 059 8
0. 059 8~0. 065 0)
0. 065 0~0 . 069 9
0. 069 9~0. 074 4
0. 074 4~0. 078 7
0. 078 7 ~ 0. 082 7
Q. 082 7~0. 086 6
0. 086 6 ~- 0. 090 3
In the table: x
D
or expressed as: || tt||Ss
Sub-sample average
Sub-sample variance
JB 5387-91
Appendix D
Minimum sample number table and reliability Degree estimation scale (supplement)
Table D1
Error limit
5%
Minimum number of samples!
3
6
F
9
10
11
12
13|| tt||14
15
X
Minimum number of samples table
WeChat degree
-90%
Coefficient of variation 10 / 4~ 0. 060 8
0. 060 8 -~ 0. 068 1
0. 068 1 --0. 074 6
0. 071 6~ 0. 080 6
0. 080 6~0. 086 3
0. 086 3 -~ 0. 091 5
0. 091 5~-. 096 4
0. 096 4-~0. 101 2
0. 101 2~-0. 105 6
0. 105 6~- 0. 109 9
IgN
lgN
- )
[gg
Error limit
8-5%
Minimum number of samples,
4||tt ||8
10
11
12
13
14
15

kN
Cycle special
Performance coefficient
Cycle reliability rate
Number of cycles
Destruction parts
N|| tt||times
tester
test period
commissioned test unit
specimen specification
sampling status and quantity
test Machine name and number
Test frequency range
Ambient temperature
Test start and end date
Fatigue limit load
SN curve or RSN curve
Test conclusion:
Testing unit conclusion:
JB 5387--91
Table B2 test report
Testing unit
of test day||tt| |Material and process characteristics
Testing machine static calibration accuracy and load fluctuation
Load cycle characteristics tight number
Ambient relative humidity
Supervising engineer (signature)|| tt||Supervisory unit (signature and seal)
year
year
month
month
E
H
JB 5387—91
Appendix C
Structure type of clamp
(reference part)
C1 It is recommended to adopt the structure of the double-degree-of-freedom connecting clamp as shown in Figure C1 Type. The structural type of the fixture used for the fatigue test of connecting more than three rows of chain segments can also be designed with reference to Figure C1. Figure Ci fixture structural type
37
Supervisor reliability
.95%
Coefficient of variation D/X range
Small
0.0201
0. 020 1 -~ 0. 031 4
0. 031 4~0. 010 3
0. 040 3-- 0. 047 6
0. 047 6-~ 0. 054 1
0. 054 1 ~ 0. 059 8
0. 059 8~0. 065 0)
0. 065 0~0 . 069 9
0. 069 9~0. 074 4
0. 074 4~0. 078 7
0. 078 7 ~ 0. 082 7
Q. 082 7~0. 086 6
0. 086 6 ~- 0. 090 3
In the table: x
D
or expressed as: || tt||Ss
Sub-sample average
Sub-sample variance
JB 5387-91
Appendix D
Minimum sample number table and reliability Degree estimation scale (supplement)
Table D1
Error limit
5%
Minimum number of samples!
3
6
F
9
10
11
12
13|| tt||14
15
X
Minimum number of samples table
WeChat degree
-90%
Coefficient of variation 10 / 4~ 0. 060 8
0. 060 8 -~ 0. 068 1
0. 068 1 --0. 074 6
0. 071 6~ 0. 080 6
0. 080 6~0. 086 3
0. 086 3 -~ 0. 091 5
0. 091 5~-. 096 4
0. 096 4-~0. 101 2
0. 101 2~-0. 105 6
0. 105 6~- 0. 109 9
IgN
lgN
- )
[gg
Error limit
8-5%
Minimum number of samples,
4||tt ||8
10
11
12
13
14
15

kN
Cycle special
Performance coefficient
Cycle reliability rate
Number of cycles
Destruction parts
N|| tt||times
tester
test period
commissioned test unit
specimen specification
sampling status and quantity
test Machine name and number
Test frequency range
Ambient temperature
Test start and end date
Fatigue limit load
SN curve or RSN curve
Test conclusion:
Testing unit conclusion:
JB 5387--91
Table B2 test report
Testing unit
of test day||tt| |Material and process characteristics
Testing machine static calibration accuracy and load fluctuation
Load cycle characteristics tight number
Ambient relative humidity
Supervising engineer (signature)|| tt||Supervisory unit (signature and seal)
year
year
month
month
E
H
JB 5387—91
Appendix C
Structure type of clamp
(reference part)
C1 It is recommended to adopt the structure of the double-degree-of-freedom connecting clamp as shown in Figure C1 Type. The structural type of the fixture used for the fatigue test of connecting more than three rows of chain segments can also be designed with reference to Figure C1. Figure Ci fixture structural type
37
Supervisor reliability
.95%
Coefficient of variation D/X range
Small
0.0201
0. 020 1 -~ 0. 031 4
0. 031 4~0. 010 3
0. 040 3-- 0. 047 6
0. 047 6-~ 0. 054 1
0. 054 1 ~ 0. 059 8
0. 059 8~0. 065 0)
0. 065 0~0 . 069 9
0. 069 9~0. 074 4
0. 074 4~0. 078 7
0. 078 7 ~ 0. 082 7
Q. 082 7~0. 086 6
0. 086 6 ~- 0. 090 3
In the table: x
D
or expressed as: || tt||Ss
Sub-sample average
Sub-sample variance
JB 5387-91
Appendix D
Minimum sample number table and reliability Degree estimation scale (supplement)
Table D1
Error limit
5%
Minimum number of samples!
3
6
F
9
10
11
12
13|| tt||14
15
X
Minimum number of samples table
WeChat degree
-90%
Coefficient of variation 10 / 4~ 0. 060 8
0. 060 8 -~ 0. 068 1
0. 068 1 --0. 074 6
0. 071 6~ 0. 080 6
0. 080 6~0. 086 3
0. 086 3 -~ 0. 091 5
0. 091 5~-. 096 4
0. 096 4-~0. 101 2
0. 101 2~-0. 105 6
0. 105 6~- 0. 109 9
IgN
lgN
- )
[gg
Error limit
8-5%
Minimum number of samples,
4||tt ||8
10
11
12
13
14
15
101 2~-0. 105 6
0. 105 6~- 0. 109 9
IgN
lgN
- )
[gg| |tt||Error limit
8-5%
Minimum number of samples,
4
8
10
11
12
13
14
15
101 2~-0. 105 6
0. 105 6~- 0. 109 9
IgN
lgN
- )
[gg| |tt||Error limit
8-5%
Minimum number of samples,
4
8
10
11
12
13
14
15
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