JB/T 58350-1999 This standard is a revision of JB/T 58350-92 "Cylinder Reliability Assessment Specification". This standard specifies the reliability assessment and evaluation indicators, verification test methods and judgment rules for ordinary single-rod double-acting piston cylinders. This standard is applicable to the reliability assessment of ordinary single-rod double-acting cylinders with compressed air as the working medium and a cylinder diameter of 32~320mm. This standard was first published on the date of year. JB/T 58350-1999 Cylinder Reliability Assessment Specification JB/T58350-1999 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T58350-1999
Specification for Reliability Assessment of Cylinders
(Internal Use)
Published on December 30, 1999
National Bureau of Machinery Industry
Implementation on June 1, 2000
JE/T583501999
4 The standard is a revision of the original standard B/T58350-92 "Specification for Reliability Assessment of Cylinders". For editorial modification, the technical content needs to be changed. The non-standard implementation of the standard is the Appendix A of JB/T58350-92. This standard is the appendix of the standard. All the contents of this standard are issued by the Pneumatic Standardization Technical Committee of the Institute of Hydraulic and Pneumatic Technology. The main contributors of this standard are: Qian Zujin. Hu Huimin, Xu Ran: 1 Scope
Machinery Industry Standard of the People's Republic of China
Cylinder Reliability Assessment Specification
(internal use) (Used)
JB/T583501999
B835092
This standard specifies the reliability evaluation index, verification method and judgment specification of single-rod double-acting cylinders, which are suitable for compressed air as the working medium and have a cylinder diameter of 32-320. 2 Referenced standards
The texts contained in the following standard letters constitute the provisions of this standard through reference in this standard. When this standard was published, , the versions shown are valid: All standard reductions will be accepted, and the parties who stop using the standards should use the following standards to urge the new performance, JR 5923 · [99 Pneumatic Cylinder Technical Conditions 3 Standards
This standard uses the following definitions:
3.1 Effectiveness! Failure! Failure
The product fails to meet the requirements bZxz.net
This product is a non-repairable product, and the first failure is considered a failure. 3.2 Average life: Average life (mcan life) (mcan rimebcrween failures! The average value of the average life (no failures) is the average working time before failure, and the English name is abbreviated as MTTF. 3.3 Reliability
The product is the rate of completing the specified function under the specified conditions and within a specified time. 3.4 Reliability Q-percentile life
The time for a given reliability.
4 Assessment requirements
4.1 Assessment indicators
The reliability assessment indicator of the cylinder is the life () when the reliability is 0.9, that is: life =300km
The average life TF-540km
According to the theory of reliability engineering and the law that the cylinder life obeys the Boolean distribution, the gas red philosophical assessment test table is formulated: see Table 1,
The test adopts the non-replacement timed truncation formula: The number of allowed failures of the element sample under different test truncation conditions is used as the judgment indicator. As shown in Table [. Approved by the State Bureau of Machinery Industry on December 30, 1999, implemented on June 1, 2000, Harbin Institute of Technology, public sample teaching, 4.2 head efficiency mode, red and decision teaching data, the above table forms a light safety effect: JB/58350-1999, cylinder performance evaluation test table, 1! The original shake shows "five wear, aging, deformation, its internal leakage exceeds the technical conditions of the complete index of 30%:: cylinder leakage inspection and adjustment has frequent gas leakage:) the load force is reduced to less than 70% of the theoretical simple output, d" active supplement, breakage, piston stuck and other causes of gas can not be normal! 66.3
4.3 Failure caused by improper installation or failure to meet the use conditions is non-related failure and the cylinder is not included in the test products.
3 Sampling
5. The test products are selected from the qualified products produced under stable and identical process conditions through full screening. The test products are given special treatment and special debugging. 5.2 Before the reliability test, the sampled products shall be unpacked and inspected according to the factory inspection procedures. The reliability of the samples shall be calculated. The unqualified items shall be recorded and analyzed as the index of the re-inspection pass rate. The re-inspection pass rate shall be above 95%. The number of unqualified products shall not be counted. 5.3 The number of samples shall not be less than 3 sets. The number of samples shall be determined based on the size of the standard production batch. See Table 2. Table 2. Product reliability test conditions and methods. 6.1 The reliability test of batch production products shall be carried out in the laboratory, and the reliability test of developed samples shall be carried out on site. The test method is to ask the drive parts to make, and the old test instrument is used for reference. The test will be carried out according to the price, starting conditions, power supply requirements, double meters, and testing materials specified in B5923. During the whole test process, the test should be carried out continuously, and the running single-trip number of the test product should be recorded. The sample operation mileage is determined from the test micro-tail mileage selected in Table 1, and then the test items B/5973 (small package durability) are tested, and the effectiveness analysis is carried out: judgment rules
JB/T583501999
test case is determined. If the failure number is not avoided and the specified allowable failure number is not exceeded, the reliability assessment of this batch of products is considered to be qualified; if the failure number is less than the allowable failure number, the reliability assessment of this batch of products is considered to be unqualified: or the formula for the reliability coefficient R of the Pyrometer distribution:
Given the reliability coefficient R, then
JB/T 583201999
Attached A
(Suggested Appendix)
Theoretical basis for the reliability assessment index of the cylinder K(2) -exp[-(1-y)/ ± J
Thus:()+-[R(Tm
Re= expe.( g- y)/
【t-=-「InRa
--[inRO]
InR。
And: In the product, a few are selected for life test, and the probability of the number of effective products before the time is less than ten (that is, the batch pass probability, if the batch pass probability is calculated by a distribution, it is: ['- Ec* I- RtoP ROa n)
Given = β = 0.1
The confidence level is 1-8 = 0.9
So:
Mc [- R(]\ R (r) \-x) -1- B-0.9Given c,, by formula F, we can get R
H:I-y+(h-)
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