1、- STD-AECMA PREN 4047-ENGL L998 = 1012311 0015457 293 R Edition approved for publication 1998-1 2-31 AECMA STANDARD prEN 4047 NORME AECMA Edition P 1 AECMA NORM Decem ber 1998 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. (+32) 2 775 81
2、 10 - Fax. (+32) 2 775 81 11 ICs: 49.030.30 Comments should be sent within six months after the date of publication to AECMA Gulledelle 94 8-1200 BRUXELLES Descriptors: Aircraft industry, nut, fastener, self-locking nut, nickel alloy, heat resistant material, classification, quality assurance, speci
3、fication, characteristic, inspection, test ENGLISH VERSION Aerospace series Nuts, self-locking, MJ threads, in heat resisting nickel base alloy NI-PH2601 (Inconel 718), silver plated Classification: I 550 MPa (at ambient temperature) / 600 OC Technical specification Srie arospatiale Luft- und Raumfa
4、hrt crous, freinage interne, a filetage MJ, Muttern, selbstsichernd, MJ-Gewinde, en alliage rsistant a chaud a base de nickel aus hochwarmfester Nickelbasislegierung NI-PH2601 (Inconel 718), argents NI-PH2601 (Inconel 718), versilbert Classification: I 550 MPa Klasse: I 550 MPa (a temprature ambiant
5、e) I600 OC (bei Raumtemperatur) I600 OC Spcification technique Technische Lieferbedingungen This %Aerospace Series” fresfandard 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 ha
6、s been technically approved by the experts of the concerned Technical Commiffee following comment by the Member countries. Subsequent to the publication of this frestandard, the technical content shall not be changed to an extent that interchangeability is atfected, physically or functionally, witho
7、ut re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Oficial Services of the Member countries it will be submitted as a draft European Standard to CEN (European Commiffee for Standardization) for formal vote. No
8、ta - Extra copies can be supplied by B.N.A.E. - Technopolis 54 - 199. rue Jean-Jacques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX C8 Chairman Mr Feltham aecma 1998 COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesSTD-AECMA PREN 4OLi7-ENG
9、L 1998 D 2022312 0025458 L2T D Page 2 prEN 4047: 1998 Contents list 1 Scope 2 Normative references 3 Definitions 4 Quality assurance 5 Requirements COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services STD-AECMA PREN 4047-ENGL 1778 3012333 0
10、035457 Obb H Page 3 prEN 4047: 1998 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for self-locking nuts with MJ threads in NI-PH2601, silver plated. Classification: 1 550 MPa l) / 600 “C 2). It is applicable whenever referenced. 2 Normative references
11、 IS0 2859-1 IS0 3452 IS0 3534-1 977 IS0 4288 IS0 8642 EN 2786 EN 3042 ASTM EI 12-96 Sampling procedures for inspection by attributes - Part I: Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection Non-destructive testing - Penetrant inspection - General principles Statis
12、tics - Vocabulary and symbols Geometrical product specifications (GPS) - Surface texture: Profile method - Rules and procedures for the assessment of surface texture Aerospace - Self-locking nuts with maximum operating temperature greater than 425 “C - Test methods Aerospace series - Electrolytic si
13、lver plating of fasteners 3, Aerospace Series - Quality assurance - EN aerospace products - Qualification proced Ure Standard Test Methods for Determining Average Grain Size 4, 1) Corresponds to the minimum tensile stress which the nut is able to withstand at ambient temperature without breaking or
14、cracking when tested with a bolt of a higher strength class. 2) Maximum test temperature of the parts 3) Published as AECMA Prestandard at the date of publication of this standard 4) Published by: American Society for Testing and Materials (ASTM), 100 Barr Harbor Dr, West Conshohocken, PA 19428-2959
15、 - USA COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services3 Definitions For the purposes of this standard, the following definitions apply: 3.1 Batch Quantity of finished nuts, of the same type and same diameter, produced from a material o
16、btained from the same melt, manufactured in the course of the same production cycle, following the same manufacturing route and having undergone all the relevant heat treatments and surface treatments 3.2 Su dace discontinu ities 3.2.1 or transcrystalline in character Crack: rupture in the material
17、which may extend in any direction and which may be intercrystalline 3.2.2 Seam: open surface defect 3.2.3 into the surface Lap: surface defect caused by folding over metal fins or sharp corners and then compressing them 3.2.4 particles may be isolated or arranged in strings. Inclusions: non-metallic
18、 particles originating from the material manufacturing process. These 3.3 Test temperature Ambient temperature, unless otherwise specified 3.4 Simple random sampling The taking of n items from a population of N items in such a way that all possible combinations of n items have the same probability o
19、f being chosen 5) 3.5 Critical defect A defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the considered product, or that is likely to prevent performance of the function of a major end item
20、 5) 3.6 Major defect A defect other than critical, that is likely to result in a failure or to reduce materially the usability of the considered product for its intended purpose 5) 3.7 Minor defect A defect that is not likely to reduce materially the usability of the considered product for its inten
21、ded purpose, or that is a departure from established specification having little bearing on the effective use or operation of this product 5) COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesSTD-AECMA PREN 4047-ENGL 1998 10123LL 00L54bl
22、714 Page 5 prEN 4047: 1998 3.8 Sampling plan A plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision 5) 3.9 Limiting quality In a sampling plan, the quality level which corresponds to the specified 10 % probability of acceptance 3.10 Ac
23、ceptable quality level (AQL) A quality level which in a sampling plan corresponds to a specified but relatively high probability of acceptance It is the maximum per cent defective (or the maximum number of defects per hundred units) that, for purposes of sampling inspection can be considered satisfa
24、ctory as a process average 5), 3.11 Finished nut A nut ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document 3.12 Definition document Document speciying all the requirements for finished nuts 3.13 Self-locking torque
25、The torque to be applied to the nut or bolt to maintain its movement of rotation in relation to the associated part, the assembly being under no axial load and the nut locking zone being completely engaged with the bolt (minimum protrusion of two pitches, including the end chamfer) 3.14 Seating torq
26、ue The tightening torque to be applied to the nut or bolt to introduce or to increase the axial load in the assembly 3.1 5 Unseating torque The untightening torque to be applied to the nut or bolt to reduce or remove the axial load in the assembly 3.16 Breakaway torque The torque required to start u
27、nscrewing the nut or bolt with respect to the associated part, with the nut locking zone still fully engaged on the bolt, but after the axial load in the assembly has been removed by unscrewing half a turn followed by a halt in rotational movement 3.17 The torque to be applied to the wrenching featu
28、re of the nut Torque for testing the wrench feature 5) Definition taken from IS0 3534 COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesSTD.AECMA PREN Li047-ENGL 1798 LOL23LL 00154b2 b50 = Page 6 prEN 4047: 1998 4 Quality assurance 4.1 Qu
29、alification EN 3042 Qualification inspections and tests (requirements, methods, numbers of nuts) are specified in table I. They shall be carried out on: - each type and diameter of nut; - 46 nuts selected from a single batch by simple random sampling. The test programme may possibly be reduced, or t
30、he qualification be granted without inspection or testing: any such decision shall be based on the results obtained on similar types and diameters of nuts provided that the design and manufacturing conditions are identical. Table 2 indicates the allocation of nut samples for the inspections and test
31、s. 4.2 Acceptance 4.2.1 Purpose The purpose of acceptance inspections and tests i to check, as simply possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the nuts constituting the batch satisfy the requirements of this standard.
32、4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of nuts) are specified in table 1. They shall be carried out on each batch. Nuts from the batch to be tested shall be selected by simple random sampling. Each nut may be submitted to several inspections or tests. If a
33、more stringent inspection is deemed necessary, all or part of the qualification inspections and tests may be performed during the acceptance inspection and testing. In this case, the number of nuts submitted to these inspections and tests is the same as that submitted for qualification inspection an
34、d tests. 4.2.3 Responsibility Acceptance inspections and tests shall be carried out by the manufacturer, or under his responsibility. 4.2.4 Inspection and test report A test report showing actual numerical values shall be provided if specified in the purchase order. 5 Requirements See table 1. COPYR
35、IGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling ServicesSTD-AECMA PREN Li047-ENGL L m LOL23LL 00154b3 577 W Page 7 prEN 4047: 1998 Table 1: Technical requirements and test methods - Clai 5.1 - 5.2 - j.3 5.3.1 5.3.2 Zharacteristic Material Iimensions
36、, :olerances and :oierances of orm and losition Manufacturing -arming ieat :reatment Requirement In accordance with the product standard or definition document In accordance with the product standard or definition document Nuts shall be formed by a hot or cold forming process. If hot formed, the for
37、ming temperature shall not exceed 1 150 “C and they shall be air cooled or faster. The equipment shall ensure a uniform temperature throughout the batch. The heat treatment medium or atmosphere shall not cause any surface contamination except as permitted by 5.5.4. Any scale which will not be remove
38、d by subsequent machinins shall be removed by abrasive blasting with an appropriate equipment. Solution treat (if applicable) at a temperature of 950 “C to 980 OC, held at the selected temperature within f 15 “C for between 1 h min and 2 h max., quench in oil, or alternative medium or faster. Precip
39、itation treat at (720 f 5) “C holding at heat for 8 h f 15 min furnace cooling at (55 f 5) “C per h to (620 f 5) “C holding at 620 “C for 8 h f 5 min followed by air cooling or faster. Instead of the 55 “C per h cooling rate to 620 OC, paris may be furnace cooled at any rate provided the time at 620
40、 “C is adjusted to give a total precipitation time of 18 h min. Inspection and test method Chemical analysis or certificate of compliance issued by the manufacturer 01 the cemi-finiched product Standard gauging The method of forming shall be indicated. Calibration of the heat treatment equipment sha
41、ll be confirmed. Visual examination Examination of the heat treatment specification Q A - - Q A - - Q Q - iample size 43 Tables 3 and 4 continued COPYRIGHT Association Europeene Des Constructeurs de Materiel AerospaceLicensed by Information Handling Services STD-AECMA PREN 4047-ENGL 1778 9 101231l 0
42、0154b4 Li23 m Page 8 prEN 4047: 1998 Table 1 (continued) Characteristic Requirement Sample si2 Inspection and test method WA 1 Bearing surface tlMlWdiCUlafi IS0 8642 43 In accordance with the product standard or definition document. For non-floating plate nuts having a bearing surface exceeding 1,5
43、times the thread nominal diameter, the perpendicularity requirement shall, unless otherwise specified by the product standard or definition document, apply only to that portion of the bearing surface of the pari contained within a diameter equal to 13 times the thread nominal diameter. Threads in th
44、e locking zone may De deformed in any manner wovided that the nut meets the *equirements of this standard. 4ny tool marks shall blend jmoothly without any abrupt :hanges. The finished nuts shall allow the GO thread plug gauge to enter a ninimum of three turns before ingagement of the locking dement
45、for nuts having overall ength of thread portion not less han 1,2 times the nominal thread fiameter. %shed nuts having shorter hreaded portion shall allow the GO” thread plug gauge to enter a ninimum of three quarters of a urn. n accordance with the product dandard or definition document Tables 3 and
46、 4 lhread and thread deformation form out-of- round) Standard gauging 43 Tables 3 and 4 surface aughness 3 IS0 4288 Visual examination Tables 3 and 4 SurfaCe :oating Appearance See EN 2786. EN 2786 43 IA Tables 3 and 4 rhickness n accordance with the product ;tandard or definition document See 5.3.6
47、.1. Inspection can I Q 2 De carried out at the same time as inspection per 5.5.1. column B I I See 5.3.6.1. Inspection can I QI 5 Adhesion See EN 2786. De carried out at the same :me as inspection per 5.4.3.2. column B continued COPYRIGHT Association Europeene Des Constructeurs de Materiel Aerospace
48、Licensed by Information Handling ServicesPage 9 prEN 4047: 1998 Requirement Table 1 (continued) Inspection and test method Clau 5.4 5.4.1 5.4.1.1 5.4.1.2 5.4.2 5.4.3 5.4.3. continued :haracteristic ilechanical woperties 4xial load it ambient emperature ifter 600 “C 3aking Wrench Feature test Vibrati
49、on test at ambient tem peratu re niched nuts shall withstand the ninimum loads specified in table 5. ifter the load has been applied the iut shall not display: - any cracks; - any permanent set; - any significant reduction in self-locking torque. -nished nuts shall withstand the ninimum loads specified in table 5. ifter testing, the nuts shall not iisplay: - any cracks; - any fracture. ermanent set and resultant zffects (reduction of the self- ocking torque) are permissible. 411 wrenchable nuts shall withstand 15 successive applications of the torque specifie
