1、 STD-AECMA PREN 3897-ENGL. 2UflLl SB 2032331 JO17633 2b I I 0 aecma 20C AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication Comments should be sent within six months after the date of publication to prEN 3899 Edition P 1 February 2000 C8 Chairman PUBLISHED BY THE EUROPEAN ASSOCIAT
2、ION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (+32) 2 775 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.030.50 Descriptors: aircraft industry, joining adaptor, steel, heat resistant steel, definition, characteristic, quality assurance, acceptance testing, specification, qualit
3、y control, defect, classification, sampling ENGLISH VERSION Aerospace series Inserts, th ic kwai I, self-loc ki ng , M J th reads, in heat resisting steel FE-PM3801 (17-4PH) Technical specification Srie arospatiale Douilles filetes, paroi renforce, freinage interne, filetage MJ, en acier rsistant ch
4、aud Spcification technique FE-PM3801 (174PH) Luft- und Raumfahrt Gewindeeinstze, dickwandig, selbstsichernd, MJ-Gewinde, aus hochwarmfestem Stahl Technische Lieferbedingungen FE-PM3801 (17-4PH) This Xerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Assoc
5、iation 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 concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content sh
6、all not be changed to an extent that interchangeability is affected, physically or functionally, without 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 subm
7、itted as a drat7 European Standard to CEN (European Committee for Standardization) for formal vote. 2000-02-29 AECMA Gulledelle 94 B-1200 BRUXELLES Mr Feltharn Contents Scope 3 Normative references . . 3 Terms and definitions 4 4 Quality assurance . 6 4.1 Qualification . 6 4.2 . . 6 4.2.1 Purpose 6
8、4.2.2 Conditions . 4.2.3 Responsibility 4.2.4 Inspection and test report 6 5 . . 6 Annex A (normative) Definition of test block . 16 Annex B (normative) Assembly for rotational resistance test 17 Annex C (normative) Axial tensile strength test . . Annex D (normative) Assembly for reusability test .
9、19 STD-AECMA PREN 3D79-ENGL 2UUU 0 LOLS3LL 0037835 O30 Page 3 prEN 3899: 2000 1 Scope This standard specifies the characteristics, qualification and acceptance requirements for self-locking thickwall inserts with MJ threads, in FE-PM3801, for aerospace applications. It is applicable whenever referen
10、ced. 2 Normative references IS0 2859-1 IS0 3452 IS0 4288 IS0 5855-2 IS0 7481 EN 2638 EN 3042 EN 4014 EN 4015 ASTM EI 12-96 Sampling procedures for inspection by attributes - Part I: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection Non-destructive testing - Penetra
11、nt inspection - General principles Geometrical Product Specifications (GPS) - Surface texture: Profile method - Rules and procedures for the assessment of surface texture Aerospace - MJ threads - Part 2: Limit dimensions for bolts and nuts Aerospace - Nuts, self-locking, with maximum operating tempe
12、rature less than or equal to 425 “C - Test methods Aerospace series - Aluminium alloy 2024-T3 extruded bar and section 1,2 I (a or D) I 150 mm with coarse peripheral grain control 1) Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Inserts, th
13、ickwall, self-locking - Design standard 1) Aerospace series - Inserts, thickwall, self-locking - Installation and removal procedure 1) Standard Test Methods for Determining Average Grain Size 2) 1) Published as AECMA Prestandard at the date of publication of this standard 2) Published by: American S
14、ociety for Testing and Materials (ASTM), 1916, Race street, Philadelphia, PA 19103, USA STD-AECMA PREN WYI-ENGL zoon w 1012311 UOL-L 77 = Page 4 prEN 3899: 2000 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1 batch quantity of finished thickw
15、all inserts, 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 manufacturing route and having undergone all the relevant heat treatments and surface treatments 3.2 Su rfa ce disc ont i
16、n u it es 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 3.2.3 surface defect caused by folding over metal fins or sharp corners and then compressing them into the surface la P 3.
17、2.4 inclusions non-metallic particles originating from the material manufacturing process. These particles may be isolated or arranged in strings. 3.3 test temperature ambient temperature, unless otherwise specified 3.4 simple random sampiing the taking of n items from a population of N items in suc
18、h a way that all possible combinations of n items have the same probability of being chosen 3.5 critical defect defect that, according to judgement and experience, is likely to result in hazardous or unsafe conditions for individuais using, maintaining, or depending upon the considered product, or t
19、hat is likely to prevent performance of the function of a major end item 3.6 major defect 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 3.7 minor defect defect that is not likely to reduce ma
20、terially the usability of the considered product for its intended purpose, or that is a departure from established specification having little bearing on the effective use or operation of this product Page 5 prEN 3899: 2000 STD-AECMA PREN 3891-ENGL 2000 LU12311 OU17837 903 3.8 sampling plan plan acc
21、ording to which one or more samples are taken in order to obtain information and possibly to reach a decision 3.9 limiting quality (sampling plan) the quality level which corresponds to a specified and relatively low probability of acceptance NOTE 1 It is the limiting lot quality characteristic that
22、 the consumer is willing to accept with a low probability that a lot of this quality would occur. NOTE 2 For the purposes of this Standard, the limiting quality quoted in table 4 corresponds to a probability of acceptance of 1 O %. 3.1 O acceptance quality limit AQL maximum per cent defective (or th
23、e maximum number of defects per hundred units) that, for purposes of sampling inspection can be considered satisfactory as a process average NOTE probability of acceptance. Variant: quality limit which in a sampling plan corresponds to a specified but relatively high 3.1 1 finished thickwall insert
24、thickwall insert 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 thick wall inserts 3.1 3 self-locking torque torque to be applied
25、to the associated bolt to maintain its movement of rotation in relation to the thickwall insert assembly which is under no axial load and the insert locking zone being completely engaged with the bolt (minimum protrusion of two pitches, including the end chamfer) 3.14 seating torque tightening torqu
26、e to be applied to the thickwall insert and bolt assembly to introduce or to increase the axial load in the assembly 3.1 5 unseating torque untightening torque to be applied to the thickwall insert and bolt assembly to reduce or remove the axial load in the assembly 3.1 6 breakaway torque torque req
27、uired to start unscrewing the associated bolt with respect to the installed thickwall insert, with the insert 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 STD-AECMA PREN 389
28、7-ENGL 2000 H LDL23Ll 0037038 BqT Paqe 6 prN 3899: 2000 4 Quality assurance 4.1 Qualification EN 3042 Qualification inspections and tests (requirements, methods, numbers of thickwall inserts) are specified in table I. They shall be carried out on: - each type and diameter of thickwall inserts; - 44
29、thick wall inserts selected from a single batch by simple random sampling. The test programme may possibly be reduced, 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 thickwall inserts provided
30、 that the design and manufacturing conditions are identical. Table 2 indicates the allocation of thickwall insert samples for the inspections 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 actu
31、al use conditions, with the uncertainty inherent to statistical sampling, that the thickwall inserts constituting the batch satisfy the requirements of this standard. 4.2.2 Conditions Acceptance inspections and tests (requirements, methods, numbers of thick wall inserts) are specified in table 1. Th
32、ey shall be carried out on each batch. Thickwall inserts from the batch to be tested shall be selected by simple random sampling. Each thickwall insert may be submitted to several inspections or tests. If a more stringent inspection is deemed necessary, all or part of the qualification inspections a
33、nd tests may be performed during the acceptance inspections and tests. In this case, the number of thickwall inserts submitted to these inspections and tests is the same as that submitted for qualification inspection and tests. 4.2.3 Responsibility Acceptance inspections and tests shall be carried o
34、ut 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. Page 7 prEN 3899: 2000 STD-AECMA PREN 3899-ENLL 2000 m LOL2333 0037839 78b Manufacturi
35、ng method shall be indicated. Table I - Technical requirements and test methods Calibration of the heat treatment equipment shall be confirmed. Visual examination - Clau - .I .2 .3 1.3.1 i.3.2 5.3.3 haracteristic laterial iimensions, )lerances nd )lerances of mn and osition ianufactunng Irocecc leat
36、 *eatment hread leformation form )ut-of-round) Requirement n accordance with the product ;tandard or definition document n accordance with the product ;tandard or definition document nserts may be manufactured by nachhing or forming. The heat treatment medium or atmosphere shall not cause any ;utfac
37、e contamination. 4ny scale which will not be removed )y subsequent machining shall be .emoved by abrasive blasting, with m appropriate equipment. The blanks shall be solution treated 2t a temperature of 1 025 “C to 1 055 “C, held at the selected :emperature within f 15 “C for I h f 15 min quench in
38、oil, or alternative, or faster. The solution treated blanks shall oe precipitation heat treated at (540 f 5) “C, held at this temperature for 4 h f 15 min and air cooled or faster. Threads in the locking zone may be deformed in any manner provided that the insert meets the requirements of this stand
39、ard. The finished inserts shall allow the “GO“ thread plug gauge to enter a minimum of three turns, when gauged from the counterbore side before engagement of the locking zone for having overall threaded length 2 I ,2 times the nominal thread diameter. Inserts having a shorter threaded length shall
40、allow the “GO thread plug gauge to enter a minimum of three quarters of a turn. Inspection and test method Jhemical analysis or sertificate of compliance ssued by the manufacturer of ihe semi-finished product Standard gauging Examination of the heat treatment specification Standard gauging Q A - - Q
41、 Q - Q A ample size 44 Tables 3 and 4 44 Tables 3 and 4 continued STD-AECMA PREN 3899-ENGL 2000 LIL23LL OOL7840 4T8 = Page 8 prEN 3899: 2000 Table 1 (continued) Cla 5.3.4 - 5.3.5 - 5.4 5.4.1 5.4.2 5.4.2.1 5.4.2.; i.4.3 Characteristi Surface roug hness Surface coating Mec han cal properties Swaging r
42、esistance Rotational resistance into test block in aluminium alloy nto test ,lock in :orrosion esisting ;teel 4xial load Requirement standard or definition document In accordance with the product standard or definition document After testing, the inserts shall not display any circular cracks. Insert
43、s shall withstand the torque specified in table B.1 without rotation. After testing, the inserts shall not display any circular cracks. See 5.4.2.1, Inserts shall withstand axial strength corresponding to the strength class of 1 100 MPa. After testing inserts shall be free from: - cracks: -failure.
44、Permanent distortion or loss of the lacking torque is acceptable. 5 Inspection and test method IS0 4288 Visual examination See applicable coating standard. Inserts shall be installed into :est block (see annex A, iormative). Jse a conical tool specified in iccordance with EN 4015 Jisual examination
45、at a suitable magnification of racks are not permitted. .5.3 - i.5.4 3 Tables 3 and 4 Material identification Iinished inserts shall be subjected .o a non-destructive test to verify .he type of material. Q 41 A 100 % i.6 Product identification Visual examination Q 41 Marking in accordance with the D
46、roduct standard or definition document Inserts shall be packed in such a way as to prevent any damage or corrosion occurring in the course o handling, transportation and storage. Each basic package shall only contain inserts with the same part number and batch number. A - A A - Tables 3 and 4 100 %
47、100 % i.7 Visual examination 5.8 Each basic package shall bear a label upon which is legibly recorded: - designation as specified by the product standard or definition document; - quantity; - batch number; - manufacturers name and trade mark. Visual examination a Q = Qualification, A = Acceptance Me
48、an diameter = the average of the major and minor axes of an individual grain b STD-AECMA PREN 3R77-ENGL. ZOOU = 1012311 0017844 043 Page 12 prEN 3899: 2000 tn C c, i! E f! .I =I m m S u) o C O m o r m 0- O .- Y c, .- CI I- - a sh .- 8 - 8 .u m n I N Q) E 4- u) Q) c, Y- O o P F X X X X - - - X X X -
49、X X - X X X X X - - - - X X - X - x STD.AECMA PREN 3899-ENGL 2000 m LOL23LL 001785 TAT m Page 13 prEN 3899: 2000 - X x X X - X X - X X - X x - X x - X X - X X X - X x - X x X - X X - cn C u) u) .- CI .- !?! 2 S O u) .- 9 C Y o O .- 5 d w a, 0- .+d .E b 1% U u) 0) .c1 ic O 0) n. F al o .- U 2 I U u) Q, S O z - STD*AECMA PREN 3895-ENGL 2000 D LOL23LL 00178Ib 7Lb D Page 14 prEN 3899: 2000 Category of defect Major Minor Table 3 - Classification of defects AQL Characteristic concerned Presence of locking element Thread size Coating l,o % Depth of counterbor
