1、- STD-AECMA PREN 3833-ENGL 1777 E 3012311 0033258 583 aecrna 1997 AECMA STANDARD prEN 3833 NORME AECMA Edition P 1 AECMA NORM July 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 8-1200 BRUXELLES - Tel. +32i 2 775 81 10 - Fax. i+32i 2 775 81 li ICs : 49.040
2、.20 Descriptors : 1 ENGLISH VERSION Srie arospatiale Luft- und Raumfahrt Vis filetage MJ, en alliage rsistant chaud base de nickel NI-PH2601 (Inconel 718) Classification : 1 550 MPa ( temprature ambiante) / 650 OC Spcification technique Schrauben, MJ-Gewinde, aus hochwarmfester Nickelbasislegierung
3、NI-PH2601 (Inconel 718) Klasse : 1 550 MPa (bei Raumtemperatur) / 650 OC I Technische Lieferbedingungen Aerospace series Bolts, MJ threads, in heat resisting nickel base alloy NI-PH2601 (Inconel 718) Classification : I 550 MPa (at ambient temperature) / 650 OC Technical specification Edition approve
4、d for publication C8 Chairman Comments should be sent within six months after the date of publication to 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-M
5、embers. It has been technically 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 functi
6、onally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPSI 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 f
7、ormal vote. 1997-07-31 AECMA Gulledelle 94 E-1 200 BRUXELLES Mr Feltham 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 3833-ENGL L777 = L
8、OL23LL 0023259 41T Page 2 prEN 3833 : 1997 Contents list 1 Scope 2 Normative references 3 Definitions 4 Quality assurance 5 Requirements Annex A (normative) : Passivation treatment for bolts Annex B (informative) : Tensile, stress rupture and tension fatigue - Areas and loads formulae Copyright Asso
9、ciation 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 3833-ENGL 1977 E LOL23Ll 00L32b0 131 = Page 3 prEN 3833 : 1997 1 Scope This standard specifies the chara
10、cteristics, qualification and acceptance requirements for bolts with MJ threads in NI-PH2601. Classification : 1 550 MPa ) / 650 OC 2, It is applicable whenever referenced. 2 Normative references IS0 2859-1 IS0 3452 IS0 3534 : 1977 IS0 4288 IS0 5855-2 IS0 6508 IS0 6892 IS0 7961 IS0 9227 EN 3042 ASTM
11、 E 11 2-88 Sampling procedures for inspection by attributes - Part 1 : Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection Non-destructive testing - Penetrant inspection - General principles Statistics - Vocabulary and symbols Rules and procedures for the measurement o
12、f surface roughness using stylus instruments Aerospace - MJ threads - Part 2 : Limit dimensions for bolts and nuts Metallic materials - Hardness test - Rockwell test (scales A - B - C - D - E - F - G - H - K) Metallic materials - Tensile testing Aerospace - Bolts - Test methods Corrosion tests in ar
13、tificial atmospheres - Salt spray tests Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Standard Test Methods for Determining Average Grain Size 3, 1 ) Minimum tensile strength of the material at ambient temperature 2) Maximum test temperature of the parts 3) P
14、ublished by : American Society for Testing and Materials (ASTM), 191 6 Race street, Philadephia, PA 191 03-1 187, USA Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without licens
15、e from IHS-,-3 Definitions For the purposes of this standard, the following definitions apply : 3.1 Batch Quantity of finished bolts, of the same type and same diameter, produced from a material obtained from the same melt, manufactured in the course of the same production cycle, following the same
16、manufacturing route and having undergone all the relevant heat treatments and surface treatments 3.2 Surface discontinuities 3.2.1 Crack : rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character 3.2.2 Seam : open surface defect 3.2
17、.3 them into the surface Lap : surface defect caused by folding over metal fins or sharp corners and then compressing 3.2.4 particles may be isolated or arranged in strings. Inclusions : non-metallic particles originating from the material manufacturing process. These 3.3 Test temperature Ambient te
18、mperature, 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 of being chosen 4, 3.5 Critical defect A defect that, according to judgement and experience, is likely
19、 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 4, 3.6 Major defect A defect, other than critical, that is likely to result in a failure or to reduc
20、e materially the usability of the considered product for its intended purpose 4, 3.7 Minor defect A defect that is not likely to reduce materially the usability of the considered product for its intended purpose, or that is a departure from established specification having little bearing on the effe
21、ctive use or operation of this product 4, 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 4, Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot
22、 for ResaleNo reproduction or networking permitted without license from IHS-,-STD-AECMA PREN 3833-ENGL 1997 IE. LO123LL 00132b2 TO4 D Page 5 prEN 3833 : 1997 3.9 Limiting quality In a sampling plan, the quality level which corresponds to the specified 10 % probability of acceptance 3.1 O Acceptable
23、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 satisfactory as
24、a process average 4). 3.11 Finished bolt A bolt ready for use, inclusive of any possible treatments and/or surface coatings, as specified in the product standard or definition document 3.1 2 Definition document Document specifying all the requirements for finished bolts 4) Definition taken from IS0
25、3534 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 3833-ENGL 1777 1012311 00132b3 940 Page 6 prEN 3833 : 1997 4 Quality assurance 4.1 Qu
26、alification EN 3042 Qualification inspections and tests (requirements, methods, numbers of bolts) are specified in table 1. They shall be carried out on : - each type and diameter of bolt ; - 25 bolts selected from a single batch by simple random sampling. The test programme may possibly be reduced,
27、 or the qualification be granted without inspection or testing : any such decision shall be based on the results obtained on similar types and diameters of bolts provided that the design and manufacturing conditions are identical. Table 2 indicates the allocation of bolt samples for the inspections
28、and tests. 4.2 Acceptance 4.2.1 Purpose The purpose of acceptance inspections and tests is to check, as simply as possible, by a method representative of actual use conditions, with the uncertainty inherent to statistical sampling, that the bolts constituting the batch satisfy the requirements of th
29、is standard. 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of bolts) are specified in table 1. They shall be carried out on each batch. Bolts from the batch to be tested shall be selected by simple random sampling. Each bolt may be submitted to several inspections
30、 or tests. If a 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 bolts submitted to these inspections and tests is the same as that submitted for qualificat
31、ion inspection and 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 S
32、ee 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 3833-ENGL 1197 1LI 1012311 00L32bli 887 1111 Page 7 prEN 3833 : 1997 Table 1 :
33、 Technical requirements and test methods continued 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 3833-ENGL 1997 1012311 00132b5 713 D Pa
34、ge 8 prEN 3833 : 1997 Table 1 (continued) Clai 3.3.3 5.3.4 5.3.5 5.3.6 5.3.7 5.3.8 Characteristic Removal of surface contamination by machining Head to shank fillet Threads Surface roughness Passivation treatment Surface coating Requirement After solution and precipitation treatment the headed blank
35、s shall have the shank and bearing surface of the head machined : a) for the removal of all surface contamination and oxide penetration ; b) to obtain a clean smooth surface. The amount of material removed (see figure 1 I shall be as little as practicable but shall not exceed the limits of table 5.
36、After completion of heat treatment and machining, the underhead fillet radius shall be cold rolled to remove all visual signs of machining and to create cold working. This may cause distortion which shall not exceed the values in figure 2, unless otherwise specified on the product standard or defini
37、tion document. For parts with compound radii between head and shank (e.g. T head bolts), cold work only the radius that blends with the head, however it is acceptable for cold work to extend over the compound radius. The fillet shall not show seams or inclusions (see table 6). Shall be formed by a s
38、ingle rolling process after full heat treatment (see figure 3). . In accordance with the product standard or definition document Uncoated finished bolts shall be passivated in accordance with annex A. After 2 h of salt spray, bolts shall show no evidence of corrosion or staining. In accordance with
39、the product standard or definition document Sample sim 25 Tables 3 and 4 IS0 4288 Visual examination 3 Tables 3 and 4 IS0 9227 Visual examination See applicable coating standard. Tables 3 and 4 continued Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under
40、license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-STD-AECMA PREN 3833-ENGL 1797 = 1012311 00132bb b5T - Clal - i.4 i.4.1 5.4.1 5.4.1 5.4.2 Characteristic Mechanical properties Tensile strength - at ambient temperature - at elevated temperature Stress
41、rupturc Page 9 prEN 3833 : 1997 Table 1 (continued) Requirement 9 test sample shall be selected rom each diameter of barlwire :aken from each cast, and shall )e heat treated together with a iroduction batch of bolts. The sample selected shall be sufficient to provide tensile and ;tress rupture test
42、pieces. The :est pieces shall meet the nechanical properties required by :he material standard. The finished bolts shall withstand :he minimum tensile loads specified in table 7. Externally wrenched bolts shall lot fail in the head to shank area Nhen subjected to the tensile :est. rensile tests are
43、not applicable to :he following : a) protruding head bolts of grip length 1 Oo) 2) A slight irregularity in the form of the crests in relation to the basic profile is acceptable (see Figure 71. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license wi
44、th AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,- STDmAECMA PREN 3833-ENGL 1777 = LO123LL 001327Li 72b D Sample size Non-destructive tests Destructive tests A B 8 3 13 5 Page 17 prEN 3833 : 1997 Acceptance number (Ac) O O Table 7 : Minimum tensile and stress r
45、upture loads Table 8 : Sampling plans for the inspection of mechanical and metallurgical characteristics Batch size 5 500 501 to 3 200 3 201 to 35 O00 2 35 O01 5 I 8 20 32 O O Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for Re
46、saleNo reproduction or networking permitted without license from IHS-,-I First Second First Second Batch size 4 4 2,42 1,35 - 8 12 - 1,72 5 5 2,21 0,89 - 10 15 - 1,74 - - Table 9 : Variable sampling for tensile test First Second First Second I Acceptable quality level (AQL) approximately 1 % 6 6 2,2
47、2 0,94 - 7 7 2,32 111 - 1,7 I .78 - - 12 18 14 21 - - Combined sample First sample Total number First Second First Second I I Kt 8 8 2,48 0,99 - 1,81 1,8 - - 16 24 10 10 2,34 1,31 - 20 30 - - - c 150 151 to 280 281 to 500 501 to 1200 1 201 to 3 200 2 3 201 Evaluate each sample by tensile strength te
48、sts as follows : First sample : accept if x1 - KaSI 2 M Reject if y, - KrS1 M Take a second sample if batch is doubtful ; evaluate as follows : Second sample : accept if xt - KtS, 2 M Reject if xt - KtS, M I Definition of symbols : - X, is the average of X, individual values in the first sample ; Ka
49、, Kr and Kt are coefficients of S which is the best estimate of standard deviation and which are used to determine acceptance or rejection of the batch represented by the sample ; M is the minimum tensile strength value according to table 7 ; X, is the average of X, individual values in the combined samples ; - where : N, is the sample size of t
