1、BRITISH STANDARD AEROSPACE SERIES BS EN 3818:2004 Bolts, MJ threads, in titanium alloy TI-P64001 Strength class: 1 100 MPa (at ambient temperature) Technical specification The European Standard EN 3818:2004 has the status of a British Standard ICS 49.030.20 BS EN 3818:2004 This British Standard was
2、published under the authority of the Standards Policy and Strategy Committee on 6 January 2005 BSI 6 January 2005 ISBN 0 580 45183 6 National foreword This British Standard is the official English language version of EN 3818:2004. It supersedes BS EN 3818:2003 which is withdrawn. The UK participatio
3、n in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement inte
4、rnational or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not pur
5、port to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committ
6、ee 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. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 22,
7、 an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3818 November 2004 ICS 49.030.20 Supersedes EN 3818
8、:2003 English version Aerospace series - Bolts, MJ threads, in titanium alloy TI- P64001 - Strength class: 1 100 MPa (at ambient temperature) - Technical specification Srie arospatiale - Vis filetage MJ, en alliage de titane TI-P64001 - Classe de rsistance : 1 100 MPa ( temprature ambiante) - Spcifi
9、cation technique Luft- und Raumfahrt - Schrauben, MJ-Gewinde, aus Titanlegierung TI-P64001 - Festigkeitsklasse: 1 100 MPa (bei Raumtemperatur) - Technische Lieferbedingungen This European Standard was approved by CEN on 11 September 2003. CEN members are bound to comply with the CEN/CENELEC Internal
10、 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 references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. T
11、his 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 member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are
12、the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United King
13、dom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3818:2004: E EN 3
14、818:2004 (E) 2 Contents Page Foreword3 1 Scope4 2 Normative references4 3 Terms and definitions .4 4 Quality assurance6 4.1 Qualification.6 4.2 Acceptance.6 5 Requirements.6 EN 3818:2004 (E) 3 Foreword This document (EN 3818:2004) has been prepared by the European Association of Aerospace Manufactur
15、ers - Standardization (AECMA-STAN). 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 AECMA, prior to its presentation to CEN. This European
16、 Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2005, and conflicting national standards shall be withdrawn at the latest by May 2005. This document supersedes EN 3818:2003. According to the CEN/CENELEC In
17、ternal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Net
18、herlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 3818:2004 (E) 4 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for bolts with MJ threads in TI-P64001, for aerospace applications. Strength cl
19、ass: 1 100 MPa 1)It is applicable whenever referenced. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (includ
20、ing any amendments) applies. 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 testing Penetrant inspection General principles ISO 4288, Geometrical Product Specification
21、s (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface texture ISO 5855-2, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts ISO 6892, Metallic materials Tensile testing at ambient temperature ISO 7961, Aerospace Bolts Test methods EN 9133, Aerospac
22、e series Quality management systems Qualification procedure for aerospace standard parts 2)3 Terms and definitions For the purposes of this standard the following terms and definitions apply. 3.1 batch quantity of finished bolts, of the same type and same diameter, produced from a material obtained
23、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 inspection lot quantity of bolts from a single production batch with the same part number which complet
24、ely defines the bolt 3.3 Surface discontinuities 3.3.1 crack rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character 1) Minimum tensile strength of the material at ambient temperature 2) Published as AECMA Prestandard at the date o
25、f publication of this standard EN 3818:2004 (E) 5 3.3.2 seam open surface defect 3.3.3 lap surface defect caused by folding over metal fins or sharp corners and then compressing them into the surface 3.3.4 inclusions non-metallic particles originating from the material manufacturing process. These p
26、articles may be isolated or arranged in strings 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 chosen 3.5 major defect a defect, other than critical, that is likely to result in
27、a failure or to reduce materially the usability of the considered product for its intended purpose 3.6 minor defect a defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established specification having little b
28、earing on the effective use or operation of this product 3.7 sampling plan a plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision 3.8 limiting quality (LQ 10 ) in a sampling plan, the quality level which corresponds to the specified 10
29、 % probability of acceptance 3.9 acceptance quality limit (AQL) a quality limit which in a sampling plan corresponds to a specified but relatively high probability of acceptance It is the maximum per cent defective (or the maximum number of defects per hundred units) that, for purposes of sampling i
30、nspection can be considered satisfactory as a process average. 3.10 finished bolt a bolt ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document 3.11 definition document document specifying all the requirements for fini
31、shed bolts EN 3818:2004 (E) 6 4 Quality assurance 4.1 Qualification EN 9133 Qualification inspections and tests (requirements, methods, numbers of bolts) are specified in Table 1. They shall be carried out on: each type and diameter of bolt; 20 bolts selected from a single batch by simple random sam
32、pling. The test programme may possibly be reduced, or the qualification be granted without inspection or testing Any such decision shall be based on the results obtained on similar types and diameters of bolts provided that the design and manufacturing conditions are identical. Table 2 indicates the
33、 allocation of bolt samples for the inspections 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 of actual use conditions, with the uncertainty inherent to statistical sampling, that the bolts const
34、ituting the batch satisfy the requirements of this standard. 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of bolts) are specified in Table 1. They shall be carried out on each batch. Bolts from the batch to be tested shall be selected by simple random sampling. E
35、ach bolt 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 bolts submitted to these inspections and te
36、sts is the same as that submitted for qualification inspection and tests. 4.2.3 Responsability 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 if s
37、pecified in the purchase order. 5 Requirements See Table 1. EN 3818:2004 (E) 7 Table 1 Technical requirements and test methods Clause Characteristic Requirement Inspection and test method Q/A a Sample size Q 5.1 Material In accordance with the product standard or definition document Chemical analysi
38、s or certificate of conformity issued by the manufacturer of the semi-finished product A Q 15 5.2 Dimensions, tolerances and tolerances of form and position In accordance with the product standard or definition document Standard gauging A Tables 3 and 4 5.3 Manufacturing Q 5.3.1 Forging The head of
39、the bolts shall be forged by a hot forging process before heat treatment. The equipment shall ensure a uniform temperature throughout the batch. According to the route of manufacture The equipment shall be approved. 5.3.2 Heat treatment According to process control Q The forged blanks shall be heat
40、treated to produce the properties required by the definition document. Blanks shall not be heat treated more than twice. The equipment shall be approved. 5.3.3 Removal of surface contamination (bearing face and shank) No sign of surface contamination or oxidation If machining is required the require
41、ments of 5.5.1 shall be respected. Visual examination 5.3.4 Q 5 Heat to shank fillet The fillet radius shall be cold rolled after heat treatment and machining so as to remove all visual signs of machining and to create superficial cold working. The deformation shall not exceed the values in Figure 1
42、. The requirements apply on bolts except on the following: a) threaded to head bolts; b) bolts with a nominal diameter 5 mm. Visual examination at a suitable magnification of 10 to 20 and dimensional check A Tables 3 and 4 5.3.5 Threads Formed by a single rolling process after full heat treatment Ac
43、cording to the route of manufacture Q 5.3.6 ISO 4288 Q 5 Surface roughness In accordance with the product standard or definition document Visual examination A Tables 3 and 4 continued EN 3818:2004 (E) 8 Table 1 (continued) Clause Characteristic Requirement Inspection and test method Q/A aSample size
44、 Q 5 5.3.7 Surface coating In accordance with the product standard or definition document See applicable coating standard. A Tables 3 and 4 5.4 Mechanical properties A test sample selected from each diameter of bar or wire from each cast shall be heat treated together with a production batch of bolt
45、s. The sample selected shall be sufficient to provide tensile test pieces. The test specimens shall meet the mechanical properties required by the material standard. ISO 7961 for bolts Q 5 5.4.1 Tensile strength If stress durability is necessary, see 5.5.6, then tensile test is not carried out. The
46、applicable tensile loads are specified in Table 5. This test applies on bolt, except on the following cases, but failure in the bearing face and shank zone is not permissible: a) protruding head bolts of grip length twice the nominal shank diameter; b) countersunk head bolts of grip length 2,5 the n
47、ominal shank diameter; c) threaded to head bolts of overall length 3 the nominal shank diameter or bolts having an overall length 18 mm; d) bolts with a thread length 1,5 times the thread nominal diameter; e) bolts of diameters of 4 mm. ISO 6892 for test specimens A Table 6 or Table 7 continued EN 3
48、818:2004 (E) 9 Table 1 (continued) Clause Characteristic Requirement Inspection and test method Q/A a Sample size Q 5 5.4.2 Tension fatigue strength Life: mean value: min. 65 000 cycles individual value: min. 45 000 cycles max. 130 000 cycles Frequency: 140 Hz max. Loads: see Table 5. This test appl
49、ies on bolts except on the following: a) protruding head bolts of grip length twice the nominal shank diameter; b) countersunk head bolts of grip length 2,5 the nominal shank diameter; c) bolts with a nominal diameter 5 mm; d) threaded to head bolts. For individual fatigue life values exceeding 65 000 cycles, breaking may occur in any place. For individual fatigue life values less than 65 000 cycles, the breaking: a) shall occur in the thread in the ca
