1、. CEN EN*3bLL 75 3404589 OLL2465 390 I BRITISH STANDARD AEROSPACE SERIES Spigots - Dimensions and fit selection - Design standard The European Standard EN 3611 : 1995 has the status of a British Standard ICs : 49.040.20 BS EN 3611 : 1995 CEN EN*3bLl 95 m 3404589 OLL2Ybb 227 Amd.No. Date The followin
2、g BSI references relate to the work on this standard Committee reference ACW14 Draft for comment 88/76176 DC BS EN 3611 : 1995 Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee AClY14, Aerospace details and pa
3、sts, upon which the following bodies were represented British Iron and Steel Producers Association Civil Aviation Authority (Airworthiness Division) Fededon of Wire Rope Manufactureis of Great Britain Institute of Petroleum Mmistry of Defence Society of British Aerospace Companies Limited ISBN O 680
4、 24488 1 CEN EN*3bLL 95 3404589 OLL2467 163 = BS EN 3611 : 1995 Contents Committees responsible Inside front cover National foreword 11 Foreword 2 Specification O Introduction 1 Scope 2 Design 3 Required characteristics 4 Designation 5 indication on drawings 5 1 Spigot dimensions and fit selection 5
5、 1 External spigot code V 3 2 Internal spigot code W 3 3 Externalspigots 4 4 Internalspigots 4 Table Figures 6 (ntitled) 5 i CEN ENx3bLL 95 I 3404589 OLL24bA OTT W BS EN 3611 : 1995 National foreword This British Standard has been prepared by Technical Committee ACW14 and is the English language ver
6、sion of EN 3611 : 1995 Amspace swies - Spigots - Diw?,ensio.rzs und fit selection - Design stundanl, published by the European Committee for Standardization (CEN). EN 3611 was produced as a result of international discussions in which the United Kingdom took an active part. Compliance with a British
7、 Standard does not of itself confer immunity from legal obligations. u . CEN ENU3biLL 95 3404589 0332469 T3b EUROPE“ STANDARD NORME EUROP- EXJROPmm NORM EN 3611 July 1995 ICs 49.040.20 Descriptors: Aircraft industry, positioning, case, dimension, fit, design, designation English version Aerospace se
8、ries - Spigots - Dimensions and fit selection - Design standard Srie arospatiale - Luft- und Raumfahrt - Pices de centrage - Dimensions et slection daustement - Norme de conception Zentrierbunde - Mae und Passungsauswahl- Konstrucktionsnorm This European Standard was approved by CEN on 199503-18. CE
9、N memberc are bound to comply with the CENKENELEC 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 references concerning such national standards may be obtained on appl
10、ication to the Central Secretariat 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 member into its own language and notified to the Central Secretariat has
11、the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standa
12、rdization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, 3-1060 Brussels 01995 Ali rights of reproduction and communication in any form and by any means reserved in ail countries to CEN and its members. Ref. No. EN 3611 : 1995 E CEN ENa3bLL 95
13、e 3404589 0222470 758 Page 2 EN 3611 : 1995 Foreword This European Standard has been prepared by the European Association of Aerospace Manufachrers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this standard has successively received the approval of
14、 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 standard, either by publication of an identical text or by endorsement, at the latest by January 1996, and confictin
15、g national standards shall be withdrawn at the lastest by January 1996. According to the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard Austria, Belgium, Denmark, Fnland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands
16、, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. . CEN EN*3bLL 75 3404589 OlL247L b94 II Page 3 EN 3611 : 1995 O Introduction Tight fining spigots may be used with casing flanges made of metallic materials to eliminate the need for close fitted bolts for radial location. 1 scop
17、e This standard specifies the dimensions and fit selection of tight fitting spigots for locating casings and other major components for aerospace applications. 2 Design The flanges shall be sufficiently flexible to accomodate the tight fitting spigot, together with differential strain when present,
18、without permanent distortion. Three or more equally spaced jacking screw locations, or other features, shall be provided so that the flanges can readily be dismantled. Where jacking screws are to be used to bear onto light alloy faces, protection for the light alloy shall be provided to avoid damage
19、. Two forms of spigot joints are shown in figures 1 and 2 : external and internal. Advantages for the external spigot : - it prevents lever being used to separate ; - it stiffens the flange at the periphery ; - it can reduce the pitch circle diameter of the bolts thus improving the “heeling“ factor.
20、 Advantages for internal spigot : - it is less likely to be shop damaged and can be more easily protected ; - under pressure the use of an interference fit (see table 1) maintains a better seal ; - the flanges may be scalloped and are therefore lighter. Figure 1 - External spigot code V Figure 2 - I
21、nternal spigot code W CEN EN*3bLL 95 I 3404589 0332472 520 Page 4 EN 3611 : 1995 3 Required characteristics See figures 3 and 4 and table 1. Dimensions and tolerances are in millimetres. 1) Tolerances, see table 1. Figure 3 - External spigots 1,6 f 0,25 I 0,8 f 0.25 I II 47 43 I- - c Lengthof0A ;I *
22、,- with H7 tolerance 1 i Tolerances, see table 1. Figure 4 - Internal spigots b . CEN EN*3611 95 I 3404589 0332473 467 Tolerance classes 1 male feature I female feature Page 5 EN 3611 : 1995 interference 1) rans sit ion Code Y I Code 2 Table 1 - Spigot dimensions and fit selection 200 AS 500 500 A 5
23、 1 000 1 O00 A s3 150 I Fits I B ICI r6ork6 H7h6 H7/k6 4,5 I0,15 4,5 p7 or k7 H7 H7/k7 , 5 on25 5 H7/p7 6,5I0,25 7 nom. I min. I 1 1 Suitable for flanges having similar thermal expansion rates. Where these differ significantly, it may be necessary to alter the diameter A of the male feature in order
24、 to ensure this fit at normal operating temperature. 4 Designation EXAMPLE : Identity block Number of this standard Spigot code (see figures 1 and 21 Fit code (see table 11 5 Indication on drawings EXAMPLE : SPI GOT EN361 1WY / Figure 5 Alternatively, the spigot may be fully dimensioned on the drawi
25、ng. CEN EN*3bLL 95 3404589 OLL2474 3T3 W BS EN 3611 : 1995 BSI 389 Chiswick High Road London w4 4AL 951140.35k- FP BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the internati
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