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Similar standardsGB/T 24608-2023: Inspection rules for rolling bearings and commercial parts---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/GBT24608-2023GB NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA ICS 21.100.20 CCS J 11 Replacing GB/T 24608-2009 Inspection rules for rolling bearings and commercial parts Issued on: DECEMBER 28, 2023 Implemented on: APRIL 1, 2024 Issued by. State Administration for Market Regulation; Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 5 4 Symbols and abbreviations... 6 5 Inspection requirements... 6 6 Sampling inspection and determination methods... 11 7 Supervision and inspection... 13 References... 16 Inspection rules for rolling bearings and commercial parts1 ScopeThis document specifies the inspection rules for general-purpose rolling bearings and their commercial parts (steel balls, ceramic balls, tapered rollers, cylindrical rollers, spherical rollers, needle rollers) and bearing accessories. This document applies to the inspection, acceptance, and supervision and inspection of rolling bearings, their commodity parts and bearing accessories by the following organizations or institutions. a) the quality department within the supplier organization (the first party); b) the purchaser or purchasing organization (the second party); c) inspection and testing agency (the third party).2 Normative referencesThe provisions of the following documents constitute the essential clauses of this document through normative references in this text. Among them, for referenced documents with dates, only the versions corresponding to the dates are applicable to this document; for referenced documents without dates, the latest versions (including all amendments) are applicable to this document. GB/T 307.1-2017 Rolling bearings - Radial bearings - Geometrical product specifications (GPS) and tolerance values GB/T 2828.1-2012 Sampling procedures for inspection by attributes - Part 1. Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 4199 Rolling bearings - Tolerances - Definitions GB/T 6930 Rolling bearings - Vocabulary GB/T 7811-2015 Rolling bearings - Symbols for physical quantities3 Terms and definitionsThe terms and definitions defined in GB/T 4199, GB/T 6930 and GB/T 2828.1-2012 and the following terms and definitions apply to this document. 3.1 supervision and inspection A means by which government departments control product quality through random inspections. 3.2 conformity assessment Demonstration that specified requirements related to a product, process, system, person or organization are fulfilled. [Source. GB/T 27000-2023, 3.1, modified]4 Symbols and abbreviationsThe symbols and abbreviations given in GB/T 307.1-2017 and GB/T 7811-2015 and the following apply to this document. Ac. Acceptance number AQL. Acceptance quality limit (expressed as the percent nonconforming or nonconformities per 100 items) n. Sample size p0.Supervision quality level Re. Rejection number r. Rejection limit5 Inspection requirements5.1 Key items 5.1.1 Sampling and determination of key items of rolling bearings shall be in accordance with the provisions of Table 1. 5.1.2 The sampling and determination of key items of commercial parts shall be in accordance with the provisions of Table 2. 5.1.3 The materials and working surfaces of rolling bearings and their commercial parts and bearing accessories shall comply with the requirements of relevant standards. 5.2 Inspection level b) specify the acceptance quality limit (AQL) value; c) select the type of sampling plan; d) determine the severity of this inspection (normal, tightened or reduced inspection) based on the previous inspection results and the adjustment and transfer rules. Normal inspection shall be used at the beginning of the inspection; e) submit product lot; f) check the packing quality and marking; g) determine the sampling plan; h) random sampling; i) testing samples; j) determine whether to accept or reject the batch based on the number of non- conforming items in the sample and the acceptance number Ac and rejection number Re in the sampling plan; k) acceptable batches; l) Disposal of unacceptable batches. 6.2 Batch formation 6.2.1 The varieties, models, specifications, materials and process conditions of the product lots submitted for inspection shall be as similar as possible and the manufacturing time shall be similar. 6.2.2 The lot size of products submitted for inspection and the method of submission of each lot may be determined by negotiation between the first party and the second party. 6.3 Sample inspection 6.3.1 Inspect the sample units one by one according to the specified inspection items. 6.3.2 The technical conditions of each item shall be in accordance with the relevant standards. For items where the technical conditions are not specified in the standards, they shall be in accordance with the sample drawings or technical documents approved by the first or second party. 6.4 Determination of acceptable lots and unacceptable lots 6.4.1 Single sampling inspection Use the single sampling inspection plan table. According to the sample inspection results, if the number of nonconforming items found in the sample is less than or equal to the acceptance number, the lot shall be considered acceptable. If the number of nonconforming items found in the sample is greater than or equal to the rejection number, the lot shall be considered unacceptable. 6.4.2 Double sampling inspection Use the double sampling inspection plan table. The number of samples for the first inspection shall be equal to the first sample size given in the plan. If the number of nonconforming items found in the first sample is less than or equal to the first acceptance number, the lot shall be considered acceptable; if the number of nonconforming items found in the first sample is greater than or equal to the first rejection number, the lot shall be considered unacceptable. If the number of nonconforming items found in the first sample is between the first acceptance number and the first rejection number, the second sample with the sample size given by the plan shall be inspected and the number of nonconforming items found in the first sample and the second sample shall be accumulated. If the accumulated number of nonconforming items is less than or equal to the second acceptance number, the lot is considered acceptable; if the accumulated number of nonconforming items is greater than or equal to the second rejection number, the lot is considered unacceptable. 6.5 Disposal of lots 6.5.1 The lot judged as acceptable shall be accepted in its entirety. However, any nonconforming items found during the inspection process shall be discarded or replaced with conforming items by the first party. 6.5.2 In principle, the entire lot judged as unacceptable shall be returned to the first party. The first party shall re-inspect the nonconforming items in the rejected lot, remove the nonconforming items or replace them with conforming items, and then submit them to the second party for inspection again.7 Supervision and inspection7.1 Supervision and inspection requirements 7.1.1 Determination of supervision quality level The supervision quality level can be selected by referring to the corresponding acceptance quality limit AQL required during inspection, which is generally not stricter than the acceptance quality limit AQL during product inspection. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
