1、BRITISH STANDARD AEROSPACE SERIESBS EN4460:2005Studs, in titanium alloy TI-P64001, with serrated locking ring in corrosion resisting steel Installation and removal procedureThe European Standard EN 4460:2005 has the status of a British StandardICS 49.030.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43
2、g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 4460:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 2 December 2005 BSI 2
3、December 2005ISBN 0 580 47330 9National forewordThis British Standard is the official English language version of EN 4460:2005.The UK participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems, which has the responsibility to: A list of or
4、ganizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Corres
5、pondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.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 does not of
6、 itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and
7、promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Co
8、mmentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 4460October 2005ICS 49.030.20English VersionAerospace series - Studs, in titanium alloy TI-P64001, withserrated locking ring in corrosion resisting steel - Installation andremoval procedureSrie arospatiale - Goujons, en alliage de titane TI-P64
9、001, avec bague de verrouillage dentele en acierrsistant la corrosion - Procdure dinstallation etdextractionLuft- und Raumfahrt - Stiftschrauben, aus TitanlegierungTI-P64001, mit Ringsicherung aus korrosionsbestndigemStahl - Ein- und AusbauverfahrenThis European Standard was approved by CEN on 26 Se
10、ptember 2005.CEN members are bound to comply 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 ob
11、tained on application 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 translationunder the responsibility of a CEN member into its own language and notified to the Central Secr
12、etariat has the same status as the officialversions.CEN members are 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, Portu
13、gal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworl
14、dwide for CEN national Members.Ref. No. EN 4460:2005: E2 Contents Page Foreword 3 1 Scope .4 2 Normative references .4 3 Installation hole.4 4 Inspection requirements before installation.6 5 Installation tools .6 6 Stud removal and replacement 8 EN 4460:20053 Foreword This European Standard (EN 4460
15、:2005) has been prepared by the European Association of Aerospace Manufacturers - 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 th
16、e 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 April 2006, and conflicting national standards shall be withdrawn at the latest by Ap
17、ril 2006. Attention is drawn to the possibility that some of the elements of this 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 or
18、ganizations 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, Netherlands, Norway, Poland, Portugal, Slovakia,
19、 Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 4460:20054 1 Scope This standard specifies the conditions of installation and removal of studs with serrated locking ring in corrosion resisting steel defined by EN 4421, for aerospace applications. 2 Normative references The following
20、 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 4421, Aerospace series Studs, in titanium alloy TI-P64001,
21、MoS2coated, with serrated locking ring in corrosion resisting steel Strength class: 1 100 MPa (at ambient temperature). 1)EN 4459, Aerospace series Studs, in titanium alloy TI-P64001, with serrated locking ring in corrosion resisting steel Design standard. 3 Installation hole 3.1 General Installatio
22、n hole is either fully defined or codified on the design drawing. Codification references the EN design standard in which the installation hole definition is given. Table 1 provides the cross reference between the insert codification, the stud threads, the tapped hole reference and the tapped hole w
23、ith serration reference. Table 1 Stud reference without length code Stud thread diameter Identity block of tapped hole Identity block of tapped hole with serration aEN4421-050 MJ50,8 EN4459-050 EN4459-050-S EN4421-060 MJ61 EN4459-060 EN4459-060-S aSee 3.2 for hole serration manufacture. 3.2 Hole dri
24、lling Drilling of pilot hole for tapping and counterboring shall be carried out in conformity with the drawing and can be carried out with a step drill if the specified pilot hole length allows it. For casings in aluminium alloy and in magnesium alloy, a spotfacing is specified. 1) Published as AECM
25、A Prestandard at the date of publication of this standard. EN 4460:20055 3.3 Broaching If drawing specifies manufacture of serration intended to facilitate assembly in hard materials they will be carried out for obtaining serration defined in Figures 1 and 2 and Table 2 in the spotfacing of the inst
26、allation hole. Table 2 Dimensions in millimetres Dimensions K R2AA AB AC AD AE Associated bolt thread max. min. max. J Number of serrationsMJ50,8 0,34 7,8 7,44 2,6 2,2 MJ61 0,43 9,01 8,54 0,06 76 3,3 2,9 0,10 15 Key 1 Serration form at this position may vary (within the profile tolerance) due to bro
27、ach wear. Figure 1 Figure 2 EN 4460:20056 4 Inspection requirements before installation Prior to installation check the installation hole, counterbore and serration (when applicable) to receive the insert are free from burrs and any foreign objects, grease, oil, etc. Inspect stud to be installed and
28、 ensure that it is clean and free from protective grease, etc. Studs installed in aluminium alloy components shall be lightly smeared externally with a suitable compound to prevent electrolytic corrosion. 5 Installation tools 5.1 General The tools and their methods of application described in this s
29、tandard are not mandatory and show only the basic principles to be observed to achieve the satisfactory installation or removal of the studs. The minimum dimensional requirements provided shall be achieved and on no account shall the design of the tools or their methods of application be such that d
30、amage may occur to the threads of the stud or the component into which it is being installed. Always ensure the appropriate tool/stud size combinations have been chosen to enable correct installation of the stud. 5.2 Stud preparation For installation in every material coat the threads with oil. 5.3
31、Stud seating If the hole in the casing is preserrated, install a 0,05 mm thickness shim to prevent the premature interlocking (engagement) of the locking ring in the spotfacing serration. Screw the stud into the tapped hole by hand until the upper face of the locking ring abuts the stud serration en
32、d and the ring lower face comes into contact with the shim or the casing as shown on Figure 3 (there is no wrench for installing the studs). Remove the shim, align the ring external serration with the spotfacing ones in screwing the stud. EN 4460:20057 Key 1 Ring stop 2 Shim Figure 3 With the approp
33、riate tool, exert a continuous axial thrust on the locking ring until its total penetration into the casing as shown in Figures 4, 5 and 6. Dimensions in millimetres Figure 4 Figure 5 EN 4460:20058 Dimensions in millimetres Key 1 Spotfacing Figure 6 6 Stud removal and replacement 6.1 Removal The stu
34、d cannot be removed without destroying the locking ring (see Figure 7 and Table 3): a) cut the stud about 2 mm above the casing face; b) centre the drill on stud axis; c) drill the stud (to install the extractor); d) drill the stud in accordance with the following dimensions: Table 3 Dimensions in m
35、illimetres Drilling Pilot hole Finishing Nut end thread nominal diameter Diameter Depth min. Diameter Depth 0,4 5 1,6 6,1 2,4 6 2,2 6,0 7,1 2,8 After drilling, stud and ring are no longer mated. e) remove all portions of the ring remaining in the casing using a sharp-pointed tool; f) unscrew the stu
36、d using an extractor; g) clean the stud hole. EN 4460:20059 a) Cutting b) Pilot hole c) Drilling d) Drilling e) Removal f) Removal aSee Table 3. bThe drill diameter and drilling depth depend on extractor used. Figure 7 6.2 Replacement There are no oversized parts for repair. The replacement conditio
37、ns for studs with locking rings shall be defined by a repair instruction drawn up by the Manufacturing Design Office (MDO). EN 4460:2005BS EN 4460:2005BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standard
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