1、AECMA STANDARD NORME AECMA AECMA NORM prEN 2646 Edition P 2 November 1998 PUBLISHED BY 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: 49.035 / 49.100 Supersedes issue P 1 May 1991 Descriptors: Aircraft
2、industry, lubricating system, grease fitting, steel, cadmium, specification, test, dimension, dimensional tolerance, surface treatment, designation, marking ENGLISH VERSION Aerospace series Nipples, lubricating, axial type, in steel, cadmium plated Srie arospatiale Graisseurs accrochage axial, en ac
3、ier, cadmis Luft- und Raumfahrt Kegel-Schmiernippel, aus Stahl, verkadmet 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
4、 approved by the experts of the 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-identificati
5、on of the standard. After examination 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 Committee for Standardization) for formal vote. Nota - Extra copies
6、 can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX Comments should be sent within six months C3 Chairman I after the date of publication to Edition approved for publication 1998-1 1-30 AECMA Gulledelle 94 B-1200 BRUXELLES Mr Visconti aec
7、ma 1998 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1 Scope This standard specifies the required characteristics and the tests for lubricating nipp
8、les of the axial type, in steel, cadmium plated. Annex A (normative) states the clearance space requirements for the coupling and uncoupling of the lubricating gun and the maximum permissible diameter of the lubricating gun barrel, together with installation thread requirements. Lubricating nipples
9、according to this standard are intended for use in aerospace assemblies, where regular lubrication of moving parts is required. 2 Normative references IS0 68 IS0 41 3 IS0 965-2 IS0 2859-1 IS0 6507-1 EN 2000 EN 2133 EN 2424 IS0 general purpose screw threads - Basic profile Aircraft - Heads of lubrica
10、ting nipples IS0 general purpose metric screw threads - Tolerances - Part 2: Limits of sizes for general purpose bolt and nut threads - Medium quality Sampling procedures for inspection by attributes - Part 1 : Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection Metall
11、ic materials - Hardness test - Vickers test - Part 1 : HV 5 to HV 1 O0 Aerospace series - Quality assurance - EN aerospace products - Approval of the Quality system of manufacturers Aerospace series - Cadmium plating of steels, with maximum specified tensile strength equal to or less than 1 450 MPa,
12、 copper, copper alloys and nickel alloys 1) Aerospace series - Marking of aerospace products STANAG 11 35 - 1983 Interchangeability of fuels, lubricants and associated products used by the armed forces of the North Atlantic Treaty Nations 2) 3 Required characteristics 3.1 The envelope dimensions for
13、 the nipple head are shown in figure 1, detail “Z“ and are in accordance with IS0 413. The tip design of the nipple (face with the sealing ball) is left atthe manufacturers option provided the profile remains within the envelope dimensions shown in figure 1 and the requirements of clause 7 are met.
14、Configuration - Dimensions - Masses The dimensions apply after surface treatment. A check valve (composed of a spring and ball) shall be located at the surface of the nipple to prevent the ingress of foreign matter into the nipple tip. Other internal design shall be at the manufacturers discretion p
15、rovided the nipples meet the requirements specified in clause 7. 1) Published as AECMA Standard at the date of publication of this standard 2) Published by: North Atlantic Treaty Organization (NATO), Military Agency for Standardization (MAS), 1 1 1 O Brussels, Belgium Previous page is blank Copyrigh
16、t Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECMA PREN 2blib-ENGL 1778 1012311 0015551 75b = Page 4 prEN 2646: 1998 Z- At manufacturers 3.2 Surface rou
17、ghness Ra = 6,3 pm unless otherwise specified. The values apply prior to surface treatment. The surface roughness of the thread will be as achieved by norma methods of manufacture. II- 7 1 across flats 3.3 Materials Case-hardening steel. The nipple head surface shall be case hardened to a depth of 0
18、,08 mm to 0,13 mm to give a minimum hardness value of HV 533 (52 HRC). The nipple body shall withstand a tigthening torque of 9 Nm without strain. Material and surface treatment for the internal parts of the nipple shall be at the manufacturers option. 3.4 Surface treatment Nipple body: cadmium plat
19、ing, thickness: 7 pm to 10 pm, in accordance with EN 2133 Dimensions in millimetres 1 across flats 9 9 I I l I opt ion Mass: max. 3g/piece Form A (code 01) a Shape optional x E .ci !k Mass: max. 1 Og/piece Form B (code 02) Mass: max. 1 lg/piece Form C (code 03) Maximal contour (broken line) Minimal
20、contour (continuous line) m- T x - 5.95 max. Figure 1 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AECIA PREN 2b4b-ENGL 1998 Ip 1012311 0015552
21、by2 Page 5 prEN 2646: 1998 Description block NIPPLE 3.5 Thread The thread shall be tapered as shown in figure 2 and conform with IS0 68 and IS0 965-2. identity block EN2646-01 Dimensions in millimetres R 0,108 0,s x 45“ / 4 Designation EXAMPLE: Figure 2 - Detail X of figure 1 Number of this standard
22、 IT Form code of nipple (see figure 1) NOTE: If necessary, the code 19005 shall be placed between the description block and the identity block. 5 Marking EN 2424, style F for products (see figure 1) and style G for each packing 6 Technical specification The lubricating nipples shall meet the require
23、ments of this standard. For quality assurance requirements, see EN 2000. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD.AECMA PREN 2b4b-ENGL 1778
24、10123LL 0015553 527 Page 6 prEN 2646: 1998 13 20 32 50 80 125 200 7 Requirements and test methods 0 1 1 1 2 3 5 Acceptance tests shall be carried out for each inspection lot. Samples shall be selected from the inspection lots in accordance with the requirements of IS0 2859-1. For non-destructive tes
25、ts “General inspection level“ II and an AQL of 1 ,O for sample size (n) shall be used (see table 1). For destructive tests “Special level“ S4 and an AQL of 1,5 for sample size (n) shall be used (see table 2). NOTE: The requirements for “continuation of inspection“, “switching procedures“ and “discon
26、tinuation of inspection“ shall be in accordance with 9.2, 9.3 and 9,4 of IS0 2859-1. Table 1 Batch size (pieces) I. 91 to 151 to 281 to 501 to 90 150 280 500 200 1 201 to 3 200 3 201 to 10 O00 Table 2 I Batch size (pieces) I n I AC I 5 500 501 to 10 O00 I 7.1 Materials and surface treatment The manu
27、facturer shall provide a test certificate proving that all materials and surface treatments comply with the requirements of 3.3 and 3.4 and shall also show that the quality has been maintained throughout all stages of nipple manufacture. 7.2 Dimensions Components shall be inspected to verify that th
28、ey conform to the relevant requirements of 3.1. Sample size: see table 1. The thread test and the verification of the absence of burrs are not included (see 7.3 or 7.6.1). 7.3 Absence of burrs The nipple shall be submitted to a 100 YO inspection to check the absence of burrs. 7.4 Marking Marking sha
29、ll comply with the requirements of clause 5. Sample size: see table 1. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD*AECMA PREN ZbLib-ENGL 1778 D
30、 LOL23LL 001555Li 4b5 Page 7 prEN 2646: 1998 7.5 Hardness 7.5.1 flats of the lubricating nipple. The hardness test Wickers) in accordance with IS0 6507-1 shall be carried out on the across Sample size: see table 2. 7.5.2 A minimum of five components shall be selected from those tested according to c
31、lause 7.5.1. 7.5.3 They shall be fractured and the case depth shall be as specified in clause 3.3. 7.6 For the purpose of these tests a parallel internal thread M6x1-6H shall be cut into a steel plate (strength 2 900 MPa). There shall be no chamfer at the entrance of the thread. Thread inspection an
32、d strength test 7.6.1 Thread test The thread shall be submitted to a 100 % inspection. It shall be possible to engage each nipple manually as deep as indicated in figure 3. Dimensions in millimetres Figure 3 7.6.2 Strength test The lubricating nipples shall withstand the tightening torque requested
33、in 3.3 when installed in a test plate to the requirements of 7.6. When removed there shall be no sign of strain on the nipple body and there shall be no substantial change in the tapered nipple thread. Sample size: see table 1. Copyright Association Europeene des Constructeurs de Materiel Aerospatia
34、l Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-7.7 Performance check Test Admit lubricant at a pressure of 7 MPa with the coupled gun held at an angle of IOo to the nipple axis. 7.7.1 carried out on each assembled nipple t
35、o ensure that the check valve will open and seat satisfactorily. A production check, of a simple mechanical nature not involving the use of grease, shall be Requirements and limitations No lubricant leakage is permitted between the gun and the nipple head. 7.7.2 Ten nipples of each form, shall be sh
36、own to meet the design performance requirements laid down in table 3 using a lubricant complying with NATO G-354 (see STANAG 1135). The test block shall have a minimum capacity of 10 ml (a suitable form of test block is depicted in figure 4). kage at sustained pressure of 35 MPa Table 3 2 ml / min m
37、ax. bpening of the nipple valve I Between 1 MPa and 3,5 MPa I Vent-screw Figure 4 - Test block Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Annex A
38、(normative) Installation requirements A. 1 Space requirements Sufficient clearance space shall be provided around the lubricating nipple to allow the coupling and uncoupling of the lubricating gun as shown in figure A.1. It shall be noted that, in uncoupling, the gun has to be tilted up to 25O in an
39、y radiai direction. Dimensions in millimetres Figure A.l A.2 Installation thread requirement The installation hole shall have a parallel thread conforming to M6x1-6H to the requirements of IS0 68 and IS0 965-2. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
