1、BRITISH STANDARDBS EN 3915:2008Aerospace series Insert, thin wall, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (NI-P100HT, Inconel 718), for salvage of components Classification: 1 275 MPa (at ambient temperature) / 550 C Technical specificationICS 49.030.99g49g50g3g38g50
2、g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 3915:2008This British Standard was published under the authority of the Standards Policy and Strategy Commit
3、tee on 30 May 2008 BSI 2008ISBN 978 0 580 60982 4National forewordThis British Standard is the UK implementation of EN 3915:2008.The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this
4、committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda iss
5、ued since publicationDate CommentsEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3915 April 2008 ICS 49.030.99 English Version Aerospace series - Insert, thin wall, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (NI-P100HT, Inconel 718), for salvage of components - Cla
6、ssification: 1 275 MPa (at ambient temperature) / 550 C - Technical specification Srie arospatiale - Douilles filetes, paroi mince, freinage interne, filetage MJ, en alliage rsistant chaud base de nickel NI-PH2601 (NI-P100HT, Inconel 718), pour rcupration - Classification : 1 275 MPa ( temprature am
7、biante) / 550 C - Spcification technique Luft- und Raumfahrt - Gewindeeinstze, dnnwandig, selbstsichernd, MJ-Gewinde, aus hochwarmfester Nickelbasislegierung NI-PH2601 (NI-P100HT, Inconel 718), zur Nacharbeit von Bauteilen - Klasse: 1 275 MPa (bei Raumtemperatur) / 550 C - Technische Lieferbedingung
8、enThis European Standard was approved by CEN on 29 February 2008. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical
9、references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN me
10、mber into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy
11、, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-105
12、0 Brussels 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3915:2008: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .5 4 Quality assurance7 4.1 Qualification .7 4.1.1 Purpose.7 4.1.2 EN
13、9133 .7 4.2 Acceptance.7 4.2.1 Purpose.7 4.2.2 Conditions 8 4.2.3 Responsibility 8 4.2.4 Inspection and test report.8 5 Requirements.8 BS EN 3915:20083 Foreword This document (EN 3915:2008) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN).
14、After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of
15、 a national standard, either by publication of an identical text or by endorsement, at the latest by October 2008, and conflicting national standards shall be withdrawn at the latest by October 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject
16、of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgar
17、ia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3915:20084 1 Scope This
18、 standard specifies the characteristics, qualification and acceptance requirements for self-locking thin wall salvage inserts with MJ threads in NI-PH2601 (NI-P100HT). Classification: 1 275 MPa 1)/ 550 C 2). 2 Normative references The following referenced documents are indispensable for the applicat
19、ion 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. EN 2404 3), Heat resisting nickel base alloy NI-P100-HT Solution treated and precipitation treated Bars Aerospace seri
20、es. 4)EN 3298, Aerospace series Inserts, thin wall, self-locking Installation and removal procedure. EN 3676, Aerospace series Inserts, thin wall, self-locking Design standard. EN 4376, Aerospace series Heat resisting alloy NI-PH2601 (NiCr19Fe19Nb5Mo3) Solution treated and precipitation treated Bar
21、and section De 200 mm. 5)EN 4377, Aerospace series Heat resisting alloy NI-PH2601 (NiCr19Fe19Nb5Mo3) Non heat treated Forging stock a or D 300 mm. 5)EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts. EN ISO 4288, Geometrical Product Specificati
22、ons (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface texture (ISO 4288:1996). ISO 2859-1, Sampling procedures for inspection by attributes Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection. ISO 3452, Non-destructive t
23、esting Penetrant inspection General principles. ISO 3534:1977, Statistics Vocabulary and symbols. 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 than 425 C Test methods. 1) The strength cl
24、ass of the insert is equal to the minimum tensile stress which the insert is able to withstand at ambient temperature without breaking or cracking when tested with a bolt of higher strength class. 2) Maximum test temperature of the parts. 3) Inactive for new designation, see EN 4376 and EN 4377. 4)
25、Published as ASD Standard at the date of publication of this standard. 5) Published as ASD Prestandard at the date of publication of this standard. BS EN 3915:20085 ASTM E 112-96, Standard test methods for determining average grain size. 6)AMS 4117, Aluminum alloy, rolled or cold finished bars, rods
26、, and wire and flash welded rings, 1.0Mg 0.60Si 0.28Cu 0.20Cr, solution and precipitation heat treated. 7)AMS-QQ-A-225/8, Aluminum alloy 6061, bar, rod, wire, and special shapes; rolled, drawn, or cold finished. 7)3 Terms and definitions For the purposes of this document, the following terms and def
27、initions apply. 3.1 production batch quantity of finished thin wall salvage inserts manufactured, using the same process, from a single material cast (single heat of alloy), having the same number (of product standard or definition document), thread code and diameter, heat treated together to the sa
28、me specified condition and produced as one continuous run 3.2 inspection lot quantity of thin wall salvage inserts from a single production batch with same number (of product standard or definition document) which completely defines the thin wall insert 3.3 Discontinuities 3.3.1 crack rupture in the
29、 material which may extend in any direction and which may be intercrystalline or transcrystalline in character 3.3.2 seam open surface defect 3.3.3 lap surface defect caused by folding over metal fins or sharp corners and then rolling or forging them into the surface 3.3.4 inclusions non-metallic pa
30、rticles originating from the material manufacturing process. These particles may be isolated or arranged in strings. 3.4 test temperature ambient temperature, unless otherwise specified 6) Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Drive,. PO Box C700, West Cons
31、hohocken, PA 19428-2959 USA. 7) Published by: Society of Automotive Engineers, Inc. (SAE), 400 Commonwealth Drive, Warrendale, PA 15096-0001, USA. BS EN 3915:20086 3.5 single random sampling taking of n items from a population of N items in such a way that all possible combinations of n items have t
32、he same possibility of being chosen ISO 3534, see definition 3.6 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, or that is likely to prevent perform
33、ance of the function of a major end item ISO 3534, see definition 3.7 major defect 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 ISO 3534, see definition 3.8 minor defect defect that is not l
34、ikely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established specification having little bearing on the effective use or operation of this product ISO 3534, see definition 3.9 sampling plan plan according to which one or more sa
35、mples are taken in order to obtain information and possibly to reach a decision ISO 3534, see definition 3.10 limiting quality (LQ10) in a sampling plan, the quality level which corresponds to the specified 10 % probability of acceptance 3.11 acceptable quality level (AQL) quality level which in a s
36、ampling plan corresponds to a specified but relatively high probability of acceptance It is the 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. 3.12 finished thin wall insert
37、 thin wall insert ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document 3.13 definition document document specifying all the requirements for finished thin wall inserts BS EN 3915:20087 3.14 self-locking torque torque
38、 to be applied to the bolt to maintain its movement of rotation in relation to the associated part, the assembly being under no axial load and the thin wall insert locking device being completely engaged with the bolt (minimum protrusion of two pitches, including the end chamfer) 3.15 seating torque
39、 tightening torque to be applied to the thin wall insert and bolt assembly to introduce or to increase the axial load in the assembly 3.16 unseating torque untightening torque to be applied to the thin wall insert and bolt assembly to reduce or remove the axial load in the assembly 3.17 breakaway to
40、rque torque required to start unscrewing the bolt with respect to the thin wall salvage insert, with the insert locking device 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 3.18 salvage i
41、nsert oversize version of a thin wall insert. This allows the salvage of components with damaged threads, out of position holes, etc. 4 Quality assurance 4.1 Qualification 4.1.1 Purpose The purpose of qualification tests is to ensure that the insert design and insert manufacturing conditions allow t
42、he insert to comply with the requirements of this standard. 4.1.2 EN 9133 Qualification inspections and tests (requirements, methods, numbers of thin wall salvage inserts) are specified in Table 1. They shall be carried out on: each type and diameter of thin wall insert, 25 thin wall inserts selecte
43、d from a single inspection lot by simple random sampling. The test programme may possibly be reduced, or the qualification of the thin wall insert be granted without inspection or testing; any such decision shall be based on the results obtained on similar types and diameters of thin wall inserts pr
44、ovided that the design and manufacturing conditions are identical. Table 2 indicates the allocation of thin wall insert specimens for the inspection and tests. 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
45、of actual use conditions, with the uncertainty inherent to statistical sampling, that the thin wall inserts constituting the batch satisfy the requirements of this standard. BS EN 3915:20088 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of thin wall salvage insert
46、s) are specified in Table 1; they shall be carried out on each production batch or inspection lot. Thin wall inserts from the batch or lot to be tested shall be selected by simple random sampling. Each thin wall insert may be submitted to several inspections or tests. If a more stringent inspection
47、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 submitted to these inspections and test is the same as that submitted for qualification inspection and tests. 4.2.3
48、 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 numerical values shall be provided at the purchasers option as part of the terms of the purchase order. 5 Requirements
49、 See Table 1. Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A aSample size Q 5.1 Material In accordance with the product standard or definition document. Chemical analysis or certificate of conformity issued by the manufacturer of the semi-finished product. A Q 25 5.2 Dimensions, tolerances and tolerances of form and position In accordance with the product standard or definition document. Standard gauging. A
