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1、4537-80 4853703 0034227 2 r ff- 13-c20 INTERNATIONAL STANDARD IS0 419-1980 (E)/ERRATUM Published 1981 -12- 15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION. MEXAYHAPOAHAR OPrAHM3AuMR no CTAHAAPTM3AuMM * ORGANISATION INTERNATIONALE DE NORMALISATION Electrodeposited metallic coatings and related fini
2、shes - Sampling procedures for inspection by attributes ERRATUM Page 1 3 Definitions in line 4 of the note, delete “thems“, and substitute “items“. Page 2 3.10 percent defective Replace the equation by the following : x loo“ number of defectives number of units inspected “Percent defective = Copyrig
3、ht International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:39:46 MDTNo reproduction or networking permitted without license from IHS -,-,- Electrodeposited metallic coatings and related finishes - Sampling proc
4、edures for inspection by attributes Dpts lectrolytiques et finitions apparentes - Mthodes dchantillonnage pour le contrle par attributs First edition 1980-07-15 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resal
5、e, 04/23/2007 01:39:46 MDTNo reproduction or networking permitted without license from IHS -,-,- 4537-80 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing Inter- national Standards
6、is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the wor
7、k. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 4519 was developed by Technical Committee ISO/TC 107, Metallic and other non-organic
8、 coatings, and was circulated to the member bodies in March 1979. It has been approved by the member bodies of the following countries Bulgaria Canada Czechoslovakia France Germany, F.R. Hungary India Israel South Africa, Rep. of Italy Spain Japan Sweden Korea, Rep, of Switzerland Libyan Arab Jamahi
9、riya Turkey Poland United Kingdom Romania U SA The member body of the following country expressed disapproval of the document on technical grounds : Netherlands International Organization for Standardization, 1980 O Printed in Switzerland I 4 8 5 1 7 0 3 0034227 b Copyright International Organizatio
10、n for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:39:46 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STAN DARD IS0 4519-1980 (E) 4537-80 I445L703 0034230 2 1 Electrodeposited metallic co
11、atings and related finishes - Sampling procedures for inspection by attributes 1 Scope and field of application This International Standard establishes sampling plans and procedures for inspection by attributes of electrodeposited metallic coatings. It may be applied to related finishes by agreement
12、 between the supplier and the purchaser. It is based on IS0 2859 (see also Addendum 1 to IS0 2859). The sampling plans in this International Standard are applicable, but not limited, to the inspection of end items, components, materials in process and finished products in storage. The plans are inte
13、nded primarily to be used for a continuing series of lots, but they may also be used for the inspection of isolated lots. However, the assurance given for isolated lots is lower than that given for a continuing series of lots. This International Standard is not applicable to the sampling and testing
14、 of mechanical fasteners having electrodeposited metallic coatings or related finishes, in all the circumstances for which procedures for these components are specified in IS0 3269. The sampling plans given in this International Standard are based on AQLs1) of 1,5 and 4,O %. Other AQLs may be used i
15、f specified in the product specification, in which case reference should be made to IS0 2859 and its Addendum 1. It is also possible to formulate sampling plans based on inspection by variables. 2 References IS0 2859, Sampling procedures and tables for inspection by at- tributes. IS0 2859iAdd. 1, Ge
16、neralinformation on sampling inspection, and guide to the use of the IS0 2859 tables. IS0 3269, Fasteners - Acceptance inspection.2) IS0 3534, Statistics -Vocabulary and symbols. 3 Definitions NOTE - Some of these definitions are not identical with those in IS0 3534 but have been modified to make th
17、em easier to understand by non-statisticians and to make them more readily applicable to elec- troplated thems. 3.1 inspection : The process of measuring, examining, testing, or otherwise comparing the unit of product (see 3.4) with the requirements. 3.2 attribute : A characteristic or property whic
18、h is appraised in terms of whether it does or does not exist (for example go or no-go) with respect to a given requirement. 3.3 inspection by attribute(s1 : Inspection whereby either the unit of product is simply classified as defective or non- defective, or the number of defects in the unit of prod
19、uct is counted, with respect to one or more given requirements. 3.4 unit of product : The object inspected either to deter- mine its classification as defective or non-defective, or to count the number of defects. It may be a single article, a pair, a set, a length, an area, an operation, a volume,
20、a component of an end item or the end product itself. The unit of product may or may not be the same as the unit of purchase, supply, produc- tion, or shipment. 3.5 acceptance number : The maximum number of defects or defective units in the sample that will permit acceptance of the inspection lot. 3
21、.6 rejection number : The minimum number of defects or defective units in the sample that will cause rejection of the in- spection lot. 3.7 inspection lot : A collection of coated articles that-are of the same kind, that have been produced to the same specifications, that have been coated by a singl
22、e supplier at one time, or at approximately the same time, under essentially iden- tical conditions and that are submitted for acceptance or rejec- tion as a group. 1) AQL = Acceptable Quality Level. 2) At present at the stage of draft. 1 Copyright International Organization for Standardization Prov
23、ided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:39:46 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 419-1980 (E) 3.8 Classification of defects and defectives 3.8.1 method of classifying defects : The enumeration of possib
24、le defects of the unit of product classified according to their seriousness. A defect is any non-conformance of the unit of product to the specified requirements. Defects are normally grouped into one or more of the following classes; however, defects may be grouped into other classes or into sub-cl
25、asses within these classes. 3.8.1.1 critical defect : A defect that judgement and ex- perience indicate is likely to result in hazardous or unsafe con- ditions for the individual using, maintaining, or depending upon the unit of product which has an electrodeposited metallic coating or related finis
26、h. It may also be a defect in the coating that judgement and experience indicate is likely to prevent per- formance of the primary function of a major end item. 3.8.1.2 major defect : A defect, other than critical, that is likely to result in failure of the finish, or to reduce materially the usabil
27、ity of the unit of product for its intended purpose. 3.8.7.3 minor defect : A defect that is not likely to reduce materially the usability of the unit of product for its intended purpose, or is a departure from established standards having little or no bearing on the effective use or operation of th
28、e item which has an electrodeposited coating or related finish. NOTE - Inspection for detection of critical defects may require non- destructive examination of every unit of product in the lot. In this Inter- national Standard, all defects not conforming to the specified re- quirements in the produc
29、t item specifications for electrodeposited coatings and related finishes are considered to be major. if specified by the purchaser, the maximum number of defects per hundred items, or the maximum percent defective laid down in this International Stan- dard can be increased for the purpose of samplin
30、g inspection of minor defects. 3.8.2 method of classifying defectives : A defective is a unit of product which contains one or more defects. Defectives are usually classified as follows : 3.8.2.1 critical defective : A defective which contains one or more critical defects, and which may contain majo
31、r or minor defects. 3.8.2.2 major defective : A defective which contains one or more major defects, and which may contain minor defects but no critical defects. 3.8.2.3 minor defective : A defective which contains one or more minor defects, but no critical or major defects. 3.9 expression of non-con
32、formance : The extent of non- conformance of a product expressed either in terms of percent defective, or in terms of defects per hundred items. 3.10 percent defective : One hundred times the number of defective units of product divided by the total number of units of product inspected, .e. number o
33、f units inspected number of defectives Percent defective = x loo 4 Product submission 4.1 Lot An inspection lot shall be a collection of items from which a sample shall be randomly drawn and inspected to determine conformance with the acceptance criteria. It may differ from a collection of units of
34、product designated as a lot for other pur- poses, such as production, shipment, and storage. 4.2 Formation of lots The product shall be assembled into identifiable lots, sub-lots, or in such manner as may be prescribed (see 6.3). Each lot shall, as far as practicable, consist of units of product or
35、separate specimens of the same basic material composition, of a single type, grade or class of the coating or finish, and ap- proximately the same size and shape, processed under essen- tially the same conditions, and at essentially the same time (see 7.2.2). 4.3 bob size The lot size is the number
36、of units of product in a lot. 4.4 Presentation of lots Unless specified by the purchaser in the contract or order, the formation of lots, the lot size and the manner in which the lot is to be presented and identified shall be designated by the sup- plier. 5 Acceptance and rejection 5.1 Responsibilit
37、y for tests Unless otherwise specified in the contract or purchase order, the supplier shall be responsible for performing all the required tests for compliance with the specified inspection re- quirements, and the supplier may use his own or any other laboratory facilities suitable for performance
38、of the inspection requirements. The purchaser shall have the right to perform any of the inspections detailed in the material document, when such action is deemed necessary to ensure that the elec- trodeposited metallic coating or the related finish conforms to the prescribed requirements. Reports o
39、f the test results shall be available for examination by the purchaser for 1 year from the date of acceptance of the material by him. Copies of the test reports and test details shall be furnished when required by the contract or purchase order. 5.2 Acceptability of lots Acceptability of a lot shall
40、 be determined by the use of a sampl- ing plan. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/23/2007 01:39:46 MDTNo reproduction or networking permitted without license from IHS -,-,- 4539-80 5.3 De
41、fective items The purchaser shall have the right to reject any unit of product found defective during inspection, whether that unit of product forms part of a sample or not, and whether the lot as a whole is accepted or rejected. With the approval of, and in the manner specified by the purchaser, re
42、jected items may be repaired or corrected and resubmitted for inspection. The supplier may be required at the discretion of the responsi- ble authority to inspect every unit of the lot for critical defects. The right is reserved to inspect every unit submitted by the sup- plier for critical defects
43、and to reject the lot immediately when a critical defect is found. The right is reserved also to sample, for critical defects, every lot submitted by the supplier and to reject any lot if a sample drawn therefrom is found to contain one or more critical defects. 5.4 Resubmitted lots Lots found unacc
44、eptable may be resubmitted for reinspection only after all items are re-examined or retested and all defec- tives are removed or the defects corrected. The purchaser shall state whether reinspection shall include all types or classes of defect, or only the particular type or class of defect which ca
45、used initial rejection. 6 Selection of samples (sampling) 6.1 Sample A sample shall consist of one or more units of product selected at random from a lot submitted for inspection without taking into account their quality. The number of units of product in the sample is the sample size. Defective uni
46、ts shall be neither deliberately included, nor excluded, from the random sample. When selecting the samples, the supplier shall identify all units which are observed to be defective, in order to dispose of or rework them after completion of inspection. 6.2 Representative sampling When appropriate, t
47、he number of units in the sample shall be selected in proportion to the size of sub-lots, or parts of lots, identified by some rational criterion. If representative sampling is used, the units from each part of the lot shall be selected at random. See the annex for methods of drawing samples. 6.3 Lo
48、t size The supplier and purchaser shall agree on a figure which is mutually convenient and which takes into account the nature of the production process. From the point of view of inspection costs there is an advantage in large lots since the sample is a smaller proportion of the lot and discriminat
49、ion improves. However, large lots should not be formed where to do so would hold up the flow of production and smaller lots could have been sampled separately to maintain the flow. Also, small lots should not be combined if there is doubt that they are of similar quality. Lots should consist of units of product produced under essentially the same conditions. IS0 4519