1、BRITISH STANDARD AEROSPACE SERIES BS EN 3297:1998 Inserts, thin wall, self-locking, MJ threads, in heat resisting nickel base alloy NI-P100HT (Inconel 718) Technical specification The European Standard EN 3297:1998 has the status of a British Standard ICS 49.030.30BSEN 3297:1998 This British Standar
2、d, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15 May 1998 BSI 05-1999 ISBN 0 580 29759 4 National foreword This British Standard is the English language version of EN 3297:1998. The UK partic
3、ipation in its preparation was entrusted by Technical 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 in
4、ternational/European committee any enquiries on 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
5、to its secretary. Cross-references The British Standards 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 B
6、SI Standards Electronic Catalogue. A British Standard 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. Summar
7、y of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 17 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 c
8、over. Amendments issued since publication Amd. No. Date CommentsBSEN 3297:1998 BSI 05-1999 i Contents Page National foreword Inside front cover Foreword 2 Text of EN 3297 3ii blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3297 January 1998 ICS 49.030.99 Descriptors: Aircraft industry, joi
9、ning adaptor, nickel alloy, heat resistant material, definition, characteristic, quality assurance, acceptance testing, specification, quality control, defect, classification, sampling English version Aerospace series Inserts, thin wall, self-locking, MJ threads, in heat resisting nickel base alloy
10、NI-P100HT (Inconel 718) Technical specification Srie arospatiale Douilles filetes, paroi mince, freinage interne, filetage MJ, en alliage rsistant chaud base de nickel NI-P100HT (Inconel 718) Spcification technique Luft- und Raumfahrt Gewindeeinstze, dnnwandig, selbstsichernd, MJ-Gewinde, aus hochwa
11、rmfester Nickelbasislegierung NI-P100HT (Inconel 718) Technische Lieferbedingungen This European Standard was approved by CEN on 18 September 1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of
12、 a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A versio
13、n in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France,
14、 Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998
15、CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3297:1998 EEN 3297:1998 BSI 05-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carri
16、ed out in accordance with the rules of this Association, this Standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a national stan
17、dard, either by publication of an identical text or by endorsement, at the latest by July 1998, and conflicting national standards shall be withdrawn at the latest by July 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bou
18、nd to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the UnitedKingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Defi
19、nitions 3 4 Quality assurance 4 5 Requirements 5 Annex A (normative) Definition of test block 15 Annex B (normative) Assembly for rotational resistance test 16 Annex C (normative) Assembly for reusability test 17 Figure A.1 15 Figure B.1 16 Figure C.1 17 Table 1 Technical requirements and test metho
20、ds 6 Table 2 Allocation of qualification testing requirements 11 Table 3 Classification of defects 13 Table 4 Sampling plans for visual inspections and dimensional characteristics 13 Table 5 Rotational resistance test values 13 Table 6 Values of breakaway torque, self-locking torque and seating torq
21、ue 14 Table 7 Sampling plans for the inspection of mechanical and metallurgical characteristics 14 Table 8 Permissible surface discontinuities 14EN 3297:1998 BSI 05-1999 3 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for self-locking thin wall insert
22、s with MJ threads in NI-P100HT. It is applicable whenever referenced. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are liste
23、d hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. ISO 2859-1, Sampling procedur
24、es for inspection by attributes Part 1: Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection. ISO 3452, Non-destructive testing Penetrant inspection General principles. ISO 3534-1977, Statistics Vocabulary and symbols. ISO 4288, Rules and procedures for the measurement
25、of surface roughness using stylus instruments. ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. ISO 8642, Aerospace Self-locking nuts with maximum operating temperature greater than425 C Test methods. EN 2404, Heat resisting nickel base alloy NI-P100HT Solution treated a
26、nd precipitation treated Bars Aerospace series 1) . EN 3042, Aerospace series Quality assurance EN aerospace products Qualification procedure. EN 3298, Aerospace series Inserts, thin wall, self-locking Installation and removal procedure 2) . EN 3676, Aerospace series Inserts, thin wall, self-locking
27、 Design standard 2) . ASTM E 112-88, Standard Test Methods for Determining Average Grain Size 3) . 3 Definitions For the purposes of this standard, the following definitions apply: 3.1 batch quantity of finished thin wall inserts, of the same type and same diameter, produced from a material obtained
28、 from the same melt, manufactured in the course of the same production cycle, following the same manufacturing route and having undergone all the relevant heat treatments and surface treatments 3.2 Surface discontinuities 3.2.1 crack rupture in the material which may extend in any direction and whic
29、h may be intercrystalline or transcrystalline in character 3.2.2 seam open surface defect 3.2.3 lap surface defect caused by folding over metal fins or sharp corners and then compressing them into the surface 3.2.4 inclusions non-metallic particles originating from the material manufacturing process
30、. These particles may be isolated or arranged in strings 3.3 test temperature ambient temperature, unless otherwise specified 3.4 simple random sampling the taking of n items from a population of N items in such a way that all possible combinations of n items have the same probability of being chose
31、n 4) 1) Published as AECMA Standard at the date of publication of this standard 2) Published as AECMA Prestandard at the date of publication of this standard 3) Published by: American Society for Testing and Materials (ASTM), 1916, Race street, Philadelphia, PA 19103, USA 4) Definition taken from IS
32、O 3534EN 3297:1998 4 BSI 05-1999 3.5 critical defect a 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, or that is likely to prevent performance of the function of a
33、 major end item 5) 3.6 major defect a defect other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose 5) 3.7 minor defect a defect that is not likely to reduce materially the usability of the considered produc
34、t for its intended purpose, or that is a departure from established specification having little bearing on the effective use or operation of this product 5) 3.8 sampling plan a plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision 5) 3.
35、9 limiting quality in a sampling plan, the quality level which corresponds to the specified 10 % probability of acceptance 3.10 acceptable quality level (AQL) a quality level which in a sampling plan corresponds to a specified but relatively high probability of acceptance it is the maximum per cent
36、defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspection can be considered satisfactory as a process average 5) 3.11 finished thin wall insert a thin wall insert ready for use, inclusive of any possible treatments and/or surface coatings, as specified
37、in the product standard or definition document 3.12 definition document document specifying all the requirements for finished thin wall inserts 3.13 self-locking torque the torque to be applied to the associated bolt to maintain its movement of rotation in relation to the thin wall insert assembly w
38、hich is under no axial load and the insert locking zone being completely engaged with the bolt (minimum protrusion of two pitches, including the end chamfer) 3.14 seating torque the tightening torque to be applied to the thin wall insert and bolt assembly to introduce or to increase the axial load i
39、n the assembly 3.15 unseating torque the untightening torque to be applied to the thin wall insert and bolt assembly to reduce or remove the axial load in the assembly 3.16 breakaway torque the torque required to start unscrewing the associated bolt with respect to the installed thin wall insert, wi
40、th the insert locking zone still fully engaged on the bolt, but after the axial load in the assembly has been removed by unscrewing half a turn followed by a halt in rotational movement 4 Quality assurance 4.1 Qualification EN3042 Qualification inspections and tests (requirements, methods, numbers o
41、f thin wall inserts) are specified inTable 1. They shall be carried out on: each type and diameter of thin wall inserts; 36 thin wall inserts selected from a single batch by simple random sampling. The test programme may possibly be reduced, or the qualification be granted without inspection or test
42、ing: any such decision shall be based on the results obtained on similar types and diameters of thin wall inserts provided that the design and manufacturing conditions are identical. Table 2 indicates the allocation of thin wall insert specimens for the inspections and tests. 5) Definition taken fro
43、m ISO 3534EN 3297:1998 BSI 05-1999 5 4.2 Acceptance 4.2.1 Purpose The purpose of acceptance inspections and tests is to check, as simply as possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the thin wall inserts constituting th
44、e batch satisfy the requirements of this standard. 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of thin wall inserts) are specified inTable 1. They shall be carried out on each batch. Thin wall inserts from the batch to be tested shall be selected by simple rando
45、m sampling. Each thin wall insert may be submitted to several inspections or tests. If a more stringent inspection is deemed necessary, all or part of the qualification inspections and tests may be performed during the acceptance inspection and testing. In this case, the number of thin wall inserts
46、submitted to these inspections and tests is the same as that submitted for qualification inspection and tests. 4.2.3 Responsibility Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility. 4.2.4 Inspection and test report A test report showing actual nu
47、merical values shall be provided if specified in the purchase order. 5 Requirements SeeTable 1.EN 3297:1998 6 BSI 05-1999 Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A a Sample size 5.1 Material In accordance with the product standar
48、d or definition document Chemical analysis or certificate of compliance issued by the manufacturer of the semi-finished product Q A 5.2 Dimensions, tolerances and tolerances of form and position In accordance with the product standard or definition document Standard gauging Q 36 A Table 3 and Table
49、4 5.3 Manufacturing 5.3.1 Process Inserts may be manufactured by machining or forming. Manufacturing method shall be indicated. Q 5.3.2 Heat treatment The heat treatment medium or atmosphere shall not cause any surface contamination. Calibration of the heat treatment equipment shall be confirmed. Q Any scale which will not be removed by subsequent machining shall be removed by abrasive blasting, with an appropriate equipment. Visual examination The blanks shall be solution trea
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