1、STD-AECMA PREN 3914-ENGL 1999 1111 1012311 00161i73 323 W Edition approved for publication 1999-09-30 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 B-1200 BRUXELLES prEN 3914 Edition P 1 September 1999 PUBLISHED B
2、Y THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.030.99 Descriptors: aircraft industry, joining adaptor, nickel alloy, heat resistant material, characteristics, surface treatment, dimension, dimensio
3、nal tolerance, designation, marking ENGLISH VERSION Aerospace series Insert, thin wall, self-locking, long, in heat resisting nickel base alloy NI-PH2601 (NI-PIOOHT, Inconel 718), silver plated on internal thread, for salvage of components Srie arospatiale Douilles filetes, a paroi mince, freinage i
4、nterne, longues, en alliage rsistant chaud base de nickel NI-PH2601 (NI-PI OOHT, Inconel 71 8), argentes sur filetage intrieur, pour rcupbration Luft- und Raumfahrt Gewindeeinstze, dnnwandig, selbstsichernd, lang, aus hochwarmfester Nickelbasislegierung NI-PH2601 (NI-PIOOHT, Inconel 718), Innengewin
5、de versilbert, zur Nacharbeit von Bauteilen This %Aerospace Series Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the
6、 concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. At7er exami
7、nation and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Cornmittee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N.A.E. -
8、 Technopolis 54 - 199. rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX C8 Chairman Mr Feltham aecma 1999 Page 3 prEN 3914: 1999 STD*AECMA PREN 3914-ENGL 1999 11181 1012311, 0036474 2bT 8111 O Introduction For design and installation procedures see EN 3298 and EN 3916. 1 Scope This standa
9、rd specifies the characteristics of long self locking, thin wall salvage inserts, in NI-PH2601 (NI-PI OOHT), with silver plated internal thread, for aerospace applications. Maximum test temperature 550 OC 2 Normative references IS0 965-1 IS0 5855-2 EN 2404 EN 2424 EN 2786 EN 3236 EN 3298 EN 3915 EN
10、3916 TR 3198 IS0 general purpose metric screw threads - Tolerances - Part 1: Principles and basic data Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts Heat resisting nickel base alloy NI-PIOOHT - Solution treated and precipitation treated - Bars - Aerospace series 1) Aerospace s
11、eries - Marking of aerospace products Aerospace series - Electrolytic silver plating of fasteners 2) Aerospace series - Inserts, thin wall , self-locking, short, in heat resisting nickel base alloy NI-P100HT (Inconel 718), silver plated internal thread Aerospace series - Inserts, thin wall, self-loc
12、king - Installation and removal procedure Aerospace series - Insert, thin wall, self-locking, Mj threads, in heat resisting nickel base alloy NI-PH2601 (NI-PIOOHT, Inconel 71 8), for salvage of components - Classification: 1 275 MPa (at ambient temperature) / 550 “C -Technical specification 2) Aeros
13、pace series - Insert, thin wall - Salvage procedure for components 2) Aerospace series - Manufacturers identification monograms and marks for EN aerospace products 3) 1) Published as AECMA Standard at the date of publication of this standard 2) Published as AECMA Prestandard at the date of publicati
14、on of this standard 3) Published as AECMA Technical Report at the date of publication of this standard Previous page is blank Page 4 prEN 3914: 1999 STD-AECMA PREN 39L4-ENGL 1979 M 3032333 0036475 LT6 m 3 Required characteristics 3.9 Configuration - Dimensions - Tolerances - masses See Figure 1 and
15、Table 1. Dimensions and tolerances are in millimetres. Dimensions apply after silver plating. 3.2 Material EN 2404 3.3 Surface treatment EN 2786 on internal thread and counterbore diameter C Thickness: - Internal threads 2 MJ6 : 5 pm min. on thread flanks - Internal threads MJ5 : shall show complete
16、 coverage, without thickness requirement - Counterbore diameter C : shall show complete coverage, without thickness requirement Page 5 STD-AECMA PREN 39Lt-ENGL I1944 1012311 001b47b 032 prEN3914: 1999 Code 050 060 070 080 FORM MAY BE PRODUCED OUT OF ROUND IN THIS AREA (APPROX MID LENGTH OF INTERNAL
17、THREAD) TO ACHIEVE SELF LOCKING REQUIREMENT TOOL MARKS PERMISS13LE 1 O0 INTERNAL THREAD FACILITATED 1-J % Thread loss BY EITHER AXIAL OR RP.E!AL GWOOVEOR GROOVES, METHOD OPTIONAL 31 26 21 17 14 1 SERRATIONS. I I- K A . - MANUFACTURERS IDENTITY 2 MARK HERE Details of form not stated are at the manufa
18、cturers option Remove sharp edges 0,l to 0,4 Ra Values apply before silver plating Figure 1 Table I Internal thread a Percentage thread loss values listed below in mm3 refer to the maximum amount of thread that can be removed to enable the facilitation of internal thread locking. These values are ob
19、tained from the volume of thread available which is defined as being the circumferential volume of thread over length K (see Figure 1 and Table 2). Table 2 4 Designation EXAMPLE: Description block INSERT THIN WALL Identity block EN3914-050 7 Number of this standard Thread code (see table I) NOTE If
20、necessary, the code 19005 shall be placed between the description block and the identity block. 5 Marking and Identification EN 2424, style G Manufacturers identification grooves shall be V - section 0,l to 0,2 deep, as indicated in figure 1. For spacing see TR 31 98 List 3. 6 Technical specification EN 3915
