SIST EN 3298:2008
(Main)Aerospace series - Inserts, thin wall, self-locking - Installation and removal procedure
Aerospace series - Inserts, thin wall, self-locking - Installation and removal procedure
This standard specifies the conditions of installation and removal (hole serration profile, tools, swaging procedure) of self-locking thin wall inserts defined by EN standards, for aerospace applications.
Luft- und Raumfahrt - Gewindeeinsätze, dünnwandig, selbstsichernd - Ein- und Ausbauverfahren
Série aérospatiale - Douilles filetées, à paroi mince, à freinage interne - Procédure d'installation et d'extraction
Aeronavtika - Vložki, tanka stena, samozapiralni - Postopek namestitve in odstranitve
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Inserts, thin wall, self-locking - Installation and removal procedureAeronavtika - Vložki, tanka stena, samozapiralni - Postopek namestitve in odstranitveSérie aérospatiale - Douilles filetées, à paroi mince, à freinage interne - Procédure d'installation et d'extractionLuft- und Raumfahrt - Gewindeeinsätze, dünnwandig, selbstsichernd - Ein- und Ausbauverfahren49.030.30MaticeNutsICS:SIST EN 3298:2008enTa slovenski standard je istoveten z:EN 3298:200801-julij-2008SIST EN 3298:2008SLOVENSKI
STANDARDSIST EN 3298:20011DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3298April 2008ICS 49.030.30Supersedes EN 3298:1998
English VersionAerospace series - Inserts, thin wall, self-locking - Installationand removal procedureSérie aérospatiale - Douilles filetées, à paroi mince, àfreinage interne - Procédure d'installation et d'extractionLuft- und Raumfahrt - Gewindeeinsätze, dünnwandig,selbstsichernd - 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 and 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 responsibility 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, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2008 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3298:2008: E
EN 3298:2008 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Hole serration profile (short inserts).4 4 Installation of inserts.5 5 Minimum criteria for the installation and removal tools and their methods of application.5 6 Assembly tools and gauges.6 6.1 General.6 6.2 Installation drive tool.6 6.3 Swage tools.7 7 Installation procedure.8 7.1 Insertion.8 7.2 Insert alignment prior to swaging.8 7.3 Swaging.9 7.4 After swage inspection.10 7.5 Inspection 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 suppliers.14 A.3 List of recommended tooling.14
EN 3298:2008 (E) 3 Foreword 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 Associations 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 shall 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. According 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, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
EN 3298:2008 (E) 4 1 Scope This standard specifies the conditions of installation and removal (hole serration profile, tools, swaging procedure) of 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 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 resisting 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 AE°1 ∅ AC
Key 1 Corners may vary from a sharp corner to a radius within the profile tolerance Figure 1
EN 3298:2008 (E) 5 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 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 installation, 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 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 Engineer) 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 installation 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 subsequent 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 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 adequately 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.
EN 3298:2008 (E) 6 6 Assembly tools and gauges 6.1 General The tools and methods shown in this section for the installation, swaging 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 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 feature 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 EN3237-070 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 B∅ E ∅ C 0,55 0,50
EN 3298:2008 (E) 7 6.3 Swage tools Table 3 gives the tool dimensions related to insert diameter code 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 component 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 Table 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 3,755 11,085 7,775 1,15
For recommended swage tool numbers, see Annex A, Table A.3 and Table A.4. F ∅ G ∅ H 1 232,5º 1,5º
EN 3298:2008 (E) 8 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 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 “crimped” externally into an elliptical shape by the manufacturer to achieve the self-locking effect o
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.