1、BRITISH STANDARDBS EN 3298:2008Aerospace series Inserts, thin wall, self-locking Installation and removal procedureICS 49.030.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g
2、60g53g44g42g43g55g3g47g36g58BS EN 3298:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 May 2008 BSI 2008ISBN 978 0 580 57574 7National forewordThis British Standard is the UK implementation of EN 3298:2008. It supersedes BS EN 3298:199
3、8 which is withdrawn. 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 committee can be obtained on request to its secretary.This publication does not purport to include all the
4、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 issued since publicationDate CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 3298April 2008ICS 49.030
5、.30 Supersedes EN 3298:1998 English VersionAerospace series - Inserts, thin wall, self-locking - Installationand removal procedureSrie arospatiale - Douilles filetes, paroi mince, freinage interne - Procdure dinstallation et dextractionLuft- und Raumfahrt - Gewindeeinstze, dnnwandig,selbstsichernd -
6、 Ein- und AusbauverfahrenThis European Standard was approved by CEN on 5 January 2008.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 a
7、nd bibliographical references concerning such nationalstandards 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 translationunder the responsibi
8、lity of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, I
9、reland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart,
10、36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3298:2008: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Hole serration profile (short inserts) .4 4 Installation of inserts.5 5 Minimum criter
11、ia for the installation and removal tools and their methods of application.5 6 Assembly tools and gauges .6 6.1 General6 6.2 Installation drive tool.6 6.3 Swage tools7 7 Installation procedure .8 7.1 Insertion8 7.2 Insert alignment prior to swaging8 7.3 Swaging 9 7.4 After swage inspection .10 7.5 I
12、nspection for minimum locking torque 11 8 Insert removal and replacement.12 Annex A (informative) Recommended tooling .14 A.1 Recommended power swaging tool suppliers .14 A.2 Recommended assembly tooling, removal tooling and gauging suppliers14 A.3 List of recommended tooling .14 BS EN 3298:20083 Fo
13、reword This document (EN 3298:2008) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (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 Associatio
14、ns 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 a national standard, either by publication of an identical text or by endorsement, at the latest by October 2008, and conflicting national standards shal
15、l 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 of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 3298:1998. A
16、ccording to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, L
17、atvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. BS EN 3298:20084 1 Scope This standard specifies the conditions of installation and removal (hole serration profile, tools, swaging procedure) o
18、f self-locking thin wall inserts defined by EN standards, for aerospace applications. 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
19、the referenced document (including any amendments) applies. EN 3236, Aerospace series Inserts, thin wall, self-locking, short, in heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plated internal thread. EN 3237, Aerospace series Inserts, thin wall, self-locking, long, in heat resisti
20、ng nickel base alloy NI-P100HT (Inconel 718), silver plated internal thread. 3 Hole serration profile (short inserts) Figure 1 and Table 1 provide details of the insert part number and associated bolt thread in relation to the serration profile in the counterbore of the installation hole. AA AD AB A
21、E1 AC Key 1 Corners may vary from a sharp corner to a radius within the profile tolerance Figure 1 BS EN 3298:20085 Table 1 Dimensions (mm) Bolt thread diameter Short inserts No. of serrations AA AB AC AD AE MJ5 0,80 EN3236-050 18 0,41 7,46 7,25 0,13 114,5 MJ6 1,00 EN3236-060 24 0,28 8,55 8,30 0,10
22、82,0 MJ7 1,00 EN3236-070 27 0,25 9,51 9,30 0,10 83,0 MJ8 1,00 EN3236-080 28 0,27 10,50 10,25 0,10 83,3 MJ10 1,25 EN3236-100 33 0,27 12,48 12,25 0,10 84,3 For recommended serration profile gauge numbers, see Annex A, Table A.1. 4 Installation of inserts Pre-installation requirements. Prior to install
23、ation, check that the tapped hole, counterbore and serrations (if applicable) are free from burrs and foreign particles, grease, oil, etc. This will particularly apply to removal of the burrs produced by the cutting of the serrations. The required insert shall be inspected to ensure that it is clean
24、 and free from protective grease, etc. Inserts installed in steel, heat resisting alloy or titanium alloy components may be lightly smeared externally with clean engine oil (i.e. any of the recognised oils used for the engine lubrication system. If in any doubt, consult the Controlling Quality Engin
25、eer) to facilitate assembly into the tapped and serrated counterbored hole. Inserts installed in aluminium or magnesium components must be lightly smeared externally with a suitable jointing compound to prevent electrolytic corrosion. A minimum of 10 minutes air drying time shall be allowed before i
26、nstallation of insert. 5 Minimum criteria for the installation and removal tools and their methods of application The tools and their methods of application described in this standard are not mandatory and show only the basic principles to be observed to achieve the satisfactory installation and sub
27、sequent swaging or removal of the inserts. 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 damage may occur to the threads or the locking zone of the insert or the component into which it is
28、being installed. Always ensure the appropriate tool/insert size combinations have been chosen for either the insertion or swaging of the insert to enable correct installation of the insert. See 6.2 and 6.3. During the swaging operation, the component into which the inserts are installed shall be ade
29、quately supported to ensure no flexing or distortion at the insert assembly face occurs. This particularly applies to drum shaped components which are prone to flexing. BS EN 3298:20086 6 Assembly tools and gauges 6.1 General The tools and methods shown in this section for the installation, swaging
30、and removal of thin wall inserts are mandatory (see Clause 4) for standard installations. When installing inserts in counterbores or other applications, e.g. curved surfaces, where standard tooling is unsuitable, alternative tools are permissible but all the dimensions in the tables must be adhered
31、to. 6.2 Installation drive tool Figure 2 shows an example of the installation drive tool configuration and Table 2 gives the relevant tool dimensions to ensure the correct tool size is used for screwing the insert into the tapped hole. The driving feature shall be hexagonal, the insert driving featu
32、re shall be tri-lobed but other tool features may vary depending upon the manufacturer. Figure 2 Table 2 Dimensions in millimetres A B C D E Short insert Long insert 0,3 0,2 + 0,050 0,15 0,05 EN3236-050 EN3237-050 7,3 2,50 4,435 1,05 6,95 EN3236-060 EN3237-060 8,5 2,70 5,325 1,30 7,95 EN3236-070 EN3
33、237-070 10,5 3,10 6,325 1,55 8,95 EN3236-080 EN3237-080 12,5 3,50 7,175 1,75 9,95 EN3236-100 EN3237-100 16,0 4,20 9,015 2,25 11,95 For recommended drive tools, see Annex A, Table A.2. D A BE C 0,55 0,50 BS EN 3298:20087 6.3 Swage tools Table 3 gives the tool dimensions related to insert diameter cod
34、e to ensure the correct tool size is used for swaging the insert into the component. Figure 3 shows an example of the swage tool configuration. The swage tool has a protective nylon washer, see Figure 3, which acts as a stop during the swaging operation and helps to protect the surface of the compon
35、ent from damage. This must be replaced when dimension “Fmax.“ is exceeded. The use of incorrect tools will cause damage to the insert and surrounding material and may also cause the flange(s) of the component to be distorted. Key 1 Shape optional 2 Rad. J 3 Nylon stop washer (Replaceable) Figure 3 T
36、able 3 Dimensions in millimetres F G H Rad. J Short insert Long insert + 0,1 0 0,015 0,015 0,25 EN3236-050 EN3237-050 2,255 5,975 3,775 0,65 EN3236-060 EN3237-060 2,455 6,995 4,575 0,80 EN3236-070 EN3237-070 2,655 8,005 5,575 1,00 EN3236-080 EN3237-080 3,055 9,025 6,275 1,00 EN3236-100 EN3237-100 3,
37、755 11,085 7,775 1,15 For recommended swage tool numbers, see Annex A, Table A.3 and Table A.4. F GH1 2 32,5 1,5 BS EN 3298:20088 7 Installation procedure 7.1 Insertion Screw the insert into tapped hole in a clockwise direction using the appropriate drive tool selected from Table 2 (Figure 2) until
38、the insert is 0,40 mm to 0,65 mm (for manual installation) or 0,50 mm to 0,65 mm (for power tool installation) below surface of parent metal as shown in Figure 4. Check that the insert is flush with or just below the bottom of the chamfer. Due to the configuration of the inserts, they may be “crimpe
39、d” externally into an elliptical shape by the manufacturer to achieve the self-locking effect on the internal thread. This may make the insert a tight fit into the tapped hole and it may be necessary to apply additional torque. This shall be only up to a maximum of 0,5 Nm using hand pressure only. I
40、f the insertion force is high, it has been found to be beneficial to run a tap into the tapped hole that is at the upper end of the tolerance range (e.g. a GH 5 tap as designated in the USA). Key 1 Insert installation depth before swaging for manual tools: 0,400,65mm for power tools: 0,500,65mm (see
41、 Clause 6 for after swage inspection) 2 Serrations in counterbore of hole Key 1 Serrations in counterbore of hole 2 Serrations on insert 3 Line up serrations between Insert and counterbored hole to provide “best fit” Figure 4 Figure 5 7.2 Insert alignment prior to swaging Before swaging the insert e
42、nsure the mating component is well supported, especially in the area the inserts are installed. 2 1 12 3BS EN 3298:20089 Where a serrated counterbore is used, i.e. with the short inserts EN 3236 series in titanium, nickel and steel alloys, it is essential that the insert serrations line up to provid
43、e “best fit” with the counterbore serrations whilst maintaining the 0,40 mm to 0,65 mm installation depth below the surface of the parent metal (see Figures 4 and 5). Where possible use 10 1 magnification plus illumination as an aid for fitting and inspection. In some installations, the quality of t
44、he serrations may be better defined on one side of the counterbored hole than the other. In these cases, the insert serrations shall be aligned with the better-defined serrations on the hole to obtain the “best fit”. 7.3 Swaging To swage and lock insert in place apply sufficient force to the appropr
45、iate swage tool selected from Table 3 (Figure 3) using one of the following methods. First preference for swaging of inserts shall be power tooling (a list of approved power swaging tools is shown in Annex A), but where this is not practical manual swaging may be used, i.e. hammer or mechanical pres
46、s. The insert is correctly swaged and locked when the gauging criteria shown in 7.4 and Figure 6 is achieved. During the swaging operation care must be exercised to ensure no unwarranted force is used, which could cause damage to the component into which the insert is being installed. If difficulty
47、is experienced with the removal of the swage tool after swaging, its release may be assisted by a very gentle rocking action, care being taken not to cause cracking to the insert or damage to the parent component. Removal may be particularly difficult when inserts have been swaged into a non pre-bro
48、ached hole, i.e. those assembled into light alloy components. Key 1 When using manual swaging, inserts should be effectively installed when the replaceable washer face touches the parent component surface; this is not applicable with power tooling. In both instances the correct swaging shall be conf
49、irmed by inspection using correct after swaging gauge, see 7.4. 2 Replaceable washer Figure 6 Swaging of insert Figure 7 After swage dimensions B A 1 2 BS EN 3298:200810 7.4 After swage inspection After the insert has been swaged, the swaged insert shall conform to the dimensional requirements of Figure 7 and Table 4. Inserts installed using a power tool will exhibit tooling steps caused by the split swaging jaws. The dimensional requirements “A” and “B” shall be inspected using one of the after swage
