1、BRITISH STANDARD AEROSPACE SERIES BS A 332:1999 ISO 9152:1998 Aerospace Bolts, with MJ threads, in titanium alloys, strength class1100 MPa Procurement specification ICS 49.030.20BSA332:1999 This British Standard, having been prepared under the directionof the Engineering SectorCommittee, was publish
2、edunder the authority ofthe Standards Committee andcomes into effect on 15 January 1999 BSI 07-1999 ISBN 0 580 32045 6 National foreword This British Standard reproduces verbatim ISO9152:1998 and implements it as the UK national standard. The UK participation in its preparation was entrusted by Tech
3、nical Committee ACE/12, Aerospace fasteners and fastening systems, to Subcommittee ACE/12/1, Aerospace fasteners and fastening systems (International), which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on
4、the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British S
5、tandards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Sta
6、ndard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover
7、, an inside front cover, pages i and ii, theISO title page, pages ii to iv, pages1to22 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publ
8、ication Amd. No. Date CommentsBSA332:1999 BSI 07-1999 i Contents Page National foreword Inside front cover Foreword iii Text of ISO 9152 1ii blankBSA332:1999 ii BSI 07-1999 Contents Page Foreword iii 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Quality assurance 2 4.1 General 2 4.1
9、.1 Approval of manufacturers 2 4.1.2 Qualification of bolts 2 4.1.3 Acceptance of bolts 2 4.2 Qualification inspection conditions 2 4.3 Acceptance inspection conditions 3 4.4 Use of “Statistical process control (SPC)” 3 5 Requirements 3 Annex A (informative) Cross sectional areas and formulae for te
10、nsile and tension fatigue loads 21 Annex B (informative) Cross sectional areas and formulae for double shear loads 21 Figure 1 Distortion in head to shank fillet area 17 Figure 2 Head to shank grain flow 17 Figure 3 Metallurgical test pieces 18 Figure 4 Grain flow in threads 18 Figure 5 Not permissi
11、ble laps, seams and surface irregularities in threads 19 Figure 6 Permissible laps and seams in threads 19 Figure 7 Permissible surface irregularities in threads 20 Figure 8 Thread discontinuities 20 Table 1 Requirements and test methods 4 Table 2 Summary of inspections for qualification and allocat
12、ion of bolt samples 10 Table 3 Classification of defects 11 Table 4 Sampling plans for visual inspections and dimensional characteristics 12 Table 5 Minimum loads for tensile and double shear tests 13 Table 6 Sampling plans for the inspection of mechanical and metallurgical characteristics 13 Table
13、7 Variable sampling for tensile and shear tests 14 Table 8 Tension fatigue test loads 15 Table 9 Recess wrenching torque 15 Table 10 Discontinuities 16 Table 11 Thread discontinuities 16 Table A.1 21 Table B.1 21 Descriptors: Aircraft industry, fasteners, MJ threads, titanium alloys, bolts, procurem
14、ents, specifications, characteristics, mechanical properties, tests, mechanical tests, quality assurance, qualification.BSA332:1999 BSI 07-1999 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work o
15、f preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmenta
16、l, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part3. Draft Int
17、ernational Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO9152 was prepared by Technical Committee ISO/TC20, Aircraf
18、t and space vehicles, Subcommittee SC4, Aerospace fastener systems. Annex A and Annex B of this International Standard are for information only.iv blankBSA332:1999 BSI 07-1999 1 1 Scope This International Standard specifies the characteristics and quality assurance requirements for MJ threads bolts
19、made in titanium alloy, of strength class1100MPa, for aerospace construction. It is applicable whenever it is referenced in a definition document. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this Internat
20、ional Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents i
21、ndicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 2859-1:1989, Sampling procedures for inspection by attributes Part 1: Sampling plans indexed by acceptab
22、le quality level (AQL) for lot-by-lot inspection. ISO 3452:1984, Non-destructive testing Penetrant inspection General principles. ISO 4288:1996, Geometrical Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface texture. ISO 5855-2:1988, Aeros
23、pace MJ threads Part2: Limit dimensions for bolts and nuts. ISO 6892:1998, Metallic materials Tensile testing at ambient temperature. ISO 7870:1993, Control charts General guide and introduction. ISO 7961:1994, Aerospace Bolts Test methods. ISO 7966:1993, Acceptance control charts. ISO 8258:1991, Sh
24、ewhart control charts. ISO 9002:1994, Quality systems Model for quality assurance in production, installation and servicing. ISO/TR 13425:1995, Guide for the selection of statistical methods in standardization and specification. 3 Terms and definitions For the purposes of this International Standard
25、, the following terms and definitions apply. 3.1 production batch quantity of finished bolts, manufactured using the same process, from a single material cast (single heat of alloy), having the same number of definition document, same thread and diameter code, heat treated together to the same speci
26、fied conditions and produced as one continuous run 3.2 inspection lot quantity of bolts from a single production batch having the same number of definition document 3.3 definition document document specifying directly or indirectly all the requirements for bolts NOTEThe definition document may be an
27、 International Standard, an in-house standard or a drawing. 3.4 crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character 3.5 seam open surface defect 3.6 lap surface defect caused by folding over metal fins or sharp corners an
28、d then rolling or forging them into the surface 3.7 crevice hollow area at thread crest 3.8 inclusions non-metallic particles originating from the material manufacturing process NOTEThese particles may be isolated or arranged in strings. 3.9 microstructural shearing shear banding V- or U-shaped ripp
29、led grain structure immediately below the thread root, or chevron-shaped rippled grain structure within the thread crestBSA332:1999 2 BSI 07-1999 3.10 sampling plan plan according to which one or more samples are taken in order to obtain information and to reach a decision, if possible NOTEIn this I
30、nternational Standard, each sampling plan defines the number of bolts to be inspected as a function of the size of the batch and the acceptance number number of defective items acceptable (Ac) 1) . 3.11 simple random sampling sampling of n items from a population of N items in such a way that all po
31、ssible combinations of n items have the same probability of being chosen 3.12 critical defect defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the considered product (bolt), or that is like
32、ly to prevent performance of the function of a major end item 3.13 major defect defect, other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product (bolt) for its intended purpose 3.14 minor defect defect that is not likely to reduce mat
33、erially the usability of the considered product (bolt) for its intended purpose, or that represents a departure from established specification having little bearing on the effective use or operation of this product 3.15 limiting quality LQ (sampling plan) quality level which corresponds to a specifi
34、ed and relatively low probability of acceptance NOTE 1It is the limiting lot quality characteristic that the consumer is willing to accept with a low probability that a lot of this quality would occur. NOTE 2For the purposes of this International Standard, the limiting quality quoted in Table 8 corr
35、esponds to a probability of acceptance of10%. 3.16 acceptable quality level AQL maximum percent defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspection, can be considered satisfactory as a process average NOTEVariant: quality level which in a sampling
36、 plan corresponds to a specified but relatively high probability of acceptance. 4 Quality assurance 4.1 General 4.1.1 Approval of manufacturers The manufacturer shall conform to the quality assurance and approval procedures defined by ISO9002. The purpose of these procedures is to ensure that a manu
37、facturer has a quality system and the capability for continuous production of bolts complying with the specified quality requirements. Quality documentation, as specified in ISO9002, for parts produced in accordance with this International Standard, shall be maintained for a minimum period of10years
38、. The approval of the manufacturer shall be granted by the Certification Authorities, or their appointed representative, who may be the prime contractor. 4.1.2 Qualification of bolts The purpose of inspections 2)is to verify that the design and manufacturing conditions of a bolt enable it to satisfy
39、 the requirements of this International Standard. The qualification shall be granted by the Certification Authorities in the purchasers country, or their appointed representative, who may be the prime contractor. 4.1.3 Acceptance of bolts The purpose of inspections is to verify, as simply as possibl
40、e, using a method which is inexpensive, with the uncertainty inherent in statistical sampling, that the bolts satisfy the requirements of this International Standard. They shall be carried out by the manufacturer, or under his responsibility. The manufacturer is responsible for the quality of the bo
41、lts manufactured. 4.2 Qualification inspection conditions Unless otherwise specified, the inspection shall be carried out on: each type and diameter of bolt; 25bolts selected from a single inspection lot by simple random sampling. 1) Supplementary information taken from ISO2859-1. 2) In order to sim
42、plify the text the term “inspections” used in this International Standard also refers to “inspections and tests”.BSA332:1999 BSI 07-1999 3 The test programme may possibly be reduced, or the qualification granted, without inspection: any such decision shall be based on the results obtained on similar
43、 types and diameters of bolts provided that the design and manufacturing conditions are identical. The inspections shall be repeated on any bolt if the manufacturing conditions have modified. Table 2 indicates the allocation of bolt sample for the inspections. 4.3 Acceptance inspection conditions In
44、spections shall be carried out on each production batch or inspection lot. Bolts from the batch or lot to be inspected shall be selected by simple random sampling. Each bolt may be submitted to several inspections, provided that none of its characteristics has been altered during any of these inspec
45、tions. The bolts to be subjected to destructive inspections may be those on which non-destructive inspections have been carried out. If a more stringent inspection is deemed necessary, all or part of the qualification inspections may be performed during the acceptance inspections. In this case, the
46、number of bolts submitted is the same as that submitted for qualification inspection. Production batches or inspection lots declared unacceptable after the production acceptance inspections shall be submitted for re-inspection only after all the defective units have been removed and/or defects have
47、been corrected. In this case, the attribute(s) which caused the rejection shall be verified using a sample of twice the normal size with the same number of defective items acceptable. 4.4 Use of “Statistical process control (SPC)” When a characteristic is obtained by a controlled statistical process
48、, the manufacturer has the possibility, in order to declare conformity of the characteristic, of refraining from the final systematic sampling provided for in this International Standard, if he is capable of formally justifying this choice by using ISO/TR13425 and the standards quoted in it as a bas
49、is. This justification will include the following phases: analysis of the products key characteristics; analysis of the risks for each implemented process; determination of tile parameters and/or characteristics to be respected under SPC; determination of the capabilities of each process; drawing up an inspection plan and integration in the manufacturing process; drawing up of routes and control charts (ISO7966, ISO7870, ISO8258); use of control charts for data consolidation; determina
