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GB/T 24607-2023: Rolling bearings - Test and assessment for life and reliability Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 24607: Historical versions
Similar standardsGB/T 24607-2023: Rolling bearings - Test and assessment for life and reliability---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/GBT24607-2023GB 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 ContentsForeword... 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... 371 ScopeThis 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 referencesThe 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 type3 Terms and definitionsFor 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.4 SymbolsThe 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 F (Li). Failure probability of the i-th set of bearings Ii. Correction value of the i-th rejected data sequence number i. The statistical sequence numbers of the actual lifespan arranged from small to large j. In incomplete test, the statistical sequence numbers of the actual lifespan arranged from small to large Li. test time of i-th bearing, h . Estimated value of average life (intermediate quantity during calculation) L10.Basic rated life, 106 r L10h. Basic rated life, h L10t. Test value of basic rated life, h L50t. Test value of median rated life, h Mc. Ratio of axial load to radial load m. The number of groups in the group elimination test P. Equivalent dynamic load, N Re. Reliability r. The number of rejected sets S. Axial force component inside the bearing caused by radial load, N Ti. Hypothetical test time (intermediate quantity during operation) X. Radial load factor Y. Axial load factor 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, h5 Principle of test for life and reliabilityTest 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 classification6.1 Tests are divided according to test methods and test purposes. 6.2 According to the test method, the classification is as follows. 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;7 Test equipment7.1 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. 7.2 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 Table 1. 7.2.2 When the bearing is subjected to a large radial load, the interference between the inner ring of the bearing and the test spindle shall be appropriately increased while ensuring the working clearance of the bearing to prevent relative sliding between the inner ring of the bearing and the test spindle during operation. 7.2.3 For bearings operating in other ways, the fit shall be determined through consultation with the user.8 Sample8.1 Sampling During sampling inspection, bearing samples shall be randomly selected from the finished products that pass the inspection. 8.2 Sample size The recommended test sample size is 8 to 20 sets. Also prepare 5 to 10 sets of spare samples. 8.3 Sample serial number Bearing samples shall have clearly identifiable unique identification.9 Test conditions9.1 General requirements The test conditions can be formulated according to the bearing parameters or the bearing operating conditions. When formulating test conditions, the effects of temperature, bearing contact stress, spindle deflection and other factors on the bearing need to be considered. For conventional bearing tests, when circulating oil lubrication is used, the bearing outer ring temperature shall not exceed 95°C. 9.2 Test speed When the inner ring of the bearing rotates, the test speed is generally 20% ~ 60% of the bearing's limit speed. When the user has needs, it can be determined through consultation with the user. 9.3 Test load 9.3.1 General The bearing test load can be selected based on the equivalent dynamic load. The equivalent dynamic load P generally takes 20%~35% of the basic rated dynamic load C. Usually refer to the test speed. 9.3.2 Equivalent dynamic load calculation The equivalent dynamic load calculation is divided into the following three situations. 9.4 Bearing lubrication 9.4.1 Oil lubrication 9.4.1.1 Lubricant designation The lubricating oil shall be L-HM32 hydraulic oil that complies with GB 11118.1-2011. When the test load is large and the test temperature is high, hydraulic oil with a higher viscosity grade can be selected, such as L-HM46, L-HM68, etc. The circulating lubricating oil for special testing (including additives added to the oil, etc.) shall be determined in consultation with the user. 9.4.1.2 Lubricating oil quality control The test lubricating oil meets the following requirements. 9.4.2 Grease lubrication 9.4.2.1 When testing grease-lubricated bearings, the lubricating oil circuit of the test bearing shall be closed. 9.4.2.2 The grease used for testing open grease-lubricated bearings shall be determined in consultation with the user. During the test process, the bearing temperature changes shall be monitored and the grease loss shall be checked. Add grease when necessary to avoid affecting the lubrication effect.10 Test steps10.1 Test preparation 10.1.1 Pre-installation inspection Before the test, the number and size of the main parts of the test shall be reviewed and inspected to ensure that there is no interference between the parts. Review and inspect the dimensions of the test spindle and bearing seat holes that match the inner and outer rings of the bearing to ensure that they meet the technical requirements of relevant drawings and documents. 10.1.2 Installation 10.1.2.1 Installation of bearing inner ring and test spindle The installation of the bearing inner ring and the test spindle generally uses press mounting, but hot mounting can also be used. The heating temperature of sealed bearings generally does not exceed 80℃. The heating temperature of open bearings generally does not exceed 100℃. The installation force shall not be transmitted through the rolling elements during installation. 10.1.2.2 Installation of bearing outer ring and bearing seat hole To install the bearing outer ring and the bearing seat hole, push the bearing gently and install it in place. 10.2 Test equipment debugging and calibration 10.2.1 After the test body and the test equipment are assembled, rotate the test spindle. 10.3 Running-in test For oil lubricated bearing testing, the lubricating oil circuit shall be opened and the test bearing shall be fully lubricated. Oil-lubricated or grease-lubricated bearings shall first apply a small amount of load, and then start the testing machine to start the bearing. When applying combined loads, the axial load shall be applied first and then the radial load. Under normal circumstances, the load and speed shall be slowly increased to the set value within 3 h. When the test load is large or the temperature rise changes rapidly, the running-in time shall be appropriately extended. Generally, it is no more than 24 h. 10.4 Formal test After the running-in test, conduct the formal test. Record the monitoring data and test time during the test. The rotation speed, load and temperature shall be controlled within the required range. 10.5 Data collection Sample failure during the test due to reasons other than the bearing itself (such as equipment reasons, human reasons, accidents, etc.) shall not be included in the normal failure data. 10.6 Termination of test The test shall be stopped when the test reaches the predetermined time or the bearing fails. 10.7 Inspection after test After the test is completed, the sample shall be inspected to determine whether the sample has rejected. If necessary, the cause analysis of typical failure samples can be carried out in the test report. Failures include. 10.8 Test sample processing Bearing samples after testing shall be properly stored. Take photos of rejected samples and their failure morphology for storage. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 24607-2023 be delivered?Answer: The full copy PDF of English version of GB/T 24607-2023 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 24607-2023_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 24607-2023_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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