1、BRITISH STANDARDBS EN 3658:2008Aerospace series Tube bend radii, for engine application Design standardICS 49.080g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g
2、55g3g47g36g58BS EN 3658:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2008 BSI 2008ISBN 978 0 580 62754 5National forewordThis British Standard is the UK implementation of EN 3658:2008.The UK participation in its preparation wa
3、s entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this 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 it
4、s correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3658March 2008ICS 49.080English VersionAerospace series - Tube bend radii, for engine ap
5、plication -Design standardSrie arospatiale - Rayons de cintrage des tubes, pourapplication moteurs - Norme de conceptionLuft- und Raumfahrt - Biegeradien von Rohren, frTriebwerksanwendung - KonstruktionsnormThis European Standard was approved by CEN on 21 December 2007.CEN members are bound to compl
6、y with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management
7、 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theoffic
8、ial 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, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Sloven
9、ia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN nation
10、al Members.Ref. No. EN 3658:2008: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Purpose.4 4 Design features and considerations4 5 Dimensions.4 BS EN 3658:20083 Foreword This document (EN 3658:2008) has been prepared by the Aerospace and Defence Industries Association of Europe - St
11、andardization (ASD-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 ASD, prior to its presentation to CEN. This European Standard sh
12、all be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2008, and conflicting national standards shall be withdrawn at the latest by September 2008. Attention is drawn to the possibility that some of the elements of thi
13、s document may be the subject 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 Stan
14、dard: Austria, Belgium, Bulgaria, 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.
15、 BS EN 3658:20084 1 Scope This standard provides details of bend radii used in the manufacture of rigid tubes. It also provides details of the minimum length of straight permissible between such radii during manufacture. This standard applies to rigid tubes conforming to EN 3717 and produced only in
16、 ASD materials. 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 (including any amendments) applies. EN 3717, A
17、erospace series Tubes Selection for engines fluid systems. 1)3 Purpose To lay the foundations for rigid tube design. 4 Design features and considerations 4.1 To allow an unbroken sequence of bending operations, all bends in a given tube configuration should have the same radius. 4.2 The standard ben
18、d radius measured to the centre line of the tube has been fixed for each tube diameter. 4.3 Standard bend radii using a range of preferred tube sizes are given in Table 1. Bend radii must lie in one plane only as shown on Figure 1. Bend radii are based on 2,5 D for steel and 3 D for titanium. 4.4 Th
19、e distance between bends in a tube configuration shall be sufficient to facilitate mandrel bending. This requires a straight length to accommodate clamp widths. Minimum lengths quoted in Table 2 should be exceeded wherever possible (see Figure 2). 4.5 During bending the wall thickness of the outer s
20、ide of the bend is reduced (see Figure 3). The acceptable minimum wall thickness T1after bending shall not be less than 90 % of the nominal wall thickness T. 4.6 Ovality may be defined as the difference between the maximum and minimum diameters of a tube at any section normal to the axis (see Figure
21、 4). The maximum ovality acceptable at any section of the tube after bending, measured normal to the axis, shall not exceed 10 % of the nominal tube outside diameter. 5 Dimensions All dimensions are in millimetres. 1) Published as ASD Prestandard at the date of publication of this standard. BS EN 36
22、58:20085 Key 1 Radius Y to lie in one plane only 2 Radius Y (based on 2,5 D for steel and 3 D for titanium where D = Outside diameter of the tube) Figure 1 Table 1 Radius Y Tube outside diameter Steel Titanium 4 10 12 5 12,5 15 6 15 18 8 20 24 9 22,5 27 10 25 30 11 27,5 33 12 30 36 14 35 42 15 37,5
23、45 16 40 48 18 45 54 20 50 60 22 55 66 25 62,5 75 28 70 84 32 80 96 36 90 108 40 100 120 45 112,5 135 50 125 150 BS EN 3658:20086 Figure 2 Table 2 Tube outside diameter Minimum length Z used for mandrel bending 4 to 50 Length equal to 3 tube outside diameter 16 aLength equal to 2 tube outside diamet
24、er aIf necessary, for tube diameters of 16 a minimum length Z of 2 tube outside diameter can be used but this is not preferable. D = Nominal tube outside diameter R = Bending radius T = Nominal wall thickness T1= Minimum wall thickness after bending Figure 3 BS EN 3658:20087 Before bending After ben
25、ding % ovality = DDD min.max. 100 Figure 4 BS EN 3658:2008BS EN 3658:2008BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international lev
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