1、A. E. C. M. A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 3152 Issue P 1 April 1989 DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 UDC : Key words : ENGLISH VERSION Aerospace series Propulsion standard parts Nuts, s
2、elf-locking, in heat resisting steel Classification : I I O0 MPa/425 OC Technical specification FE-PA92HT (A286) Srie arospatiale Pices normalises pour la propulsion crous, auto-freinants en acier rsistant chaud Classification : 11 O0 MPa/425 OC Spcification technique FE-PA92HT (A286) Luft- und Raum
3、fahrt Genormte Antriebsteile Muttern, selbstsichernd aus hochwarmfestem Stahl Klasse : 1 1 O0 MPa/425 OC Technische Lieferbedingungen FE-PA9SHT (A286) This Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial
4、). It is published on green paper for the needs of AECMA-Members. It has been technically approved b y the experts of the concerned AECMA Commission following comment by the Member countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent
5、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 Official Services of the Member countries it will be submitted as a draft European Stand
6、ard to CEN (European Committee for Standardization) for final vote. Nota - Extra copies can be supplied by B.N.A.E. - 8, rue Moreau-Vauthier - 92100 BOULOGNE-BILLANCOURT Edition approved for publication Comments should be sent within six months C8 Chairman after the date of publication decision 25th
7、 April 1989 A.E.C.M.A. Mr WILLIAMS 88, Bd. Malesherbes 75008 PARIS - FRANCE 0 aecma 1989 prEN3152 Page2 Contents - i). Scope and field of application 2). References 3). Definitions 3-11. Production batch. 3.2). Inspection lot. 3.3). Discontinuities. 3.4). Test temperature. 3.5). Simple random sampli
8、ng. 3.6). Critical defect- 3.7). Major defect. 3.8). Minor defect. 3.9)- Sampling plan. 3.lO).Lmiting quality. 3.1l).Acceptable quality level. 3.12l.Finished nut. 3.13).Definition document. 3.14).Self locking torque. . 3.151.Seating torque. 3.16)-Unseating torque. 3.17).Breakaway torque. 3.18).Wrenc
9、h torque. 41.Certification and quality assurance. 4.1). Qualification. 4.2). Acceptance. 4.3). Quality system certification. 4.41- Responsibility for inspection and tests. 4.5). Inspection and test report. 5).Table 1 : Technical requirement and test methods. 5.1). Materials. 5.2). Dimensions;toleran
10、ces of form and position; 5.3). Manufacturing. 5.4). Mechanical properties. 5-51. Metallurgical properties. 5.6). Product identification. 5 - 7 . Deliverv. threads and quality Table 2. : Table 3. : Table 4. : Table 5. : Table 6. : Table 7. : Table 8. : Table 9. : Summary of tests-Qualification and p
11、roduction acceptance- Qualification testing requirements for nut samples. Load values for Axial strength: Wrench torque; Push out; Torque out and Tight- ening torque for accelerated vibration. Values for Breakaway torque;locking torque and Assembly torque. Classification of defects. Sampling plans f
12、or visual inspections and dimensional characteristics. Sampling plans for the inspection of mechanical and metallurgical characteristics. Maximum depth of permissible discontinuities. AECMA PREN3152 87 10123L1 0004735 9 W prEN3152 Page3 1.Scope and field of application This standard specifies the te
13、chnical; qualification and quality assurance requirements for self locking nuts in material FE PAgS-HT(A286) of tensile strength class 1100MPa. at room temperature, maxiym test temperature of nuts to this specification 425 C. Primarily for Aerospace applications it is applicable to such self locking
14、 nuts when referenced on the product standard or drawing. 2.References IS0 2859-1 IS0 3452 Is0 3453 IS0 3534 IS0 7481 IS0 9002 EN 2002-8 EN 2398 EN 2399 EN 3039 EN 3041 EN 3042 EN 3638 EN 3639 CN/TR 3040 Sampling procedures for inspection by attributes - Part i : Sampling plans indexed by acceptable
15、 quality level (AQL) for lot by lot inspection. 4). Non destructive testing - Penetrant inspection - General principles Non destructive testing - Liquid penetrant inspection - Means of verification Statistics -Vocabulary and symbols Aerospace - Fasteners - self locking nuts with maximug operating te
16、mperature less than or equal to 425 C - test methods. Quality systems - Model for quality assurance in production and installation. Aerospace Series: Test methods for metallic materials - Part 8 : Micrographic determination of grain size. i). Heat resisting steel FE-PA92HT - Rm equal to or greater t
17、han 900MPa. bars for machined bolts - D equal to or less than 25mm - Aerospace Series. i). Heat resisting steel FE-PA92HT -Rm equal to or greater than 900MPa. bars for forged bolts - D equal to or less than 25mm - Aerospace Series. I). Aerospace series - Quality systems: supplementary requirements t
18、o IS09002 applicable to the manufacture/processing of materiel for propulsion standard parts. 3). Aerospace series - Propulsion standard parts - Manufacturing process - change procedure for qualified parts. 3). Aerospace series - Propulsion standard parts - Qualification procedure. 2). Aerospace ser
19、ies - Heat resisting alloy FE-PA92HT - solution treated - Sheet and strip. 3). Aerospace series - Heat resisting steel FE-PA92HT - cold worked and softened - Bar and Wire for the continuous forging or extrusion for fasteners. 3). Aerospace series - Propulsion standard parts - Qualification: List of
20、qualified manufacturers. 3). i) Published as AEM standard 2) Published as AEW pre-standard 3) In ccurse of preparation 4) At present at the stage of draft.(Revision, in part of IC0 28594974.) I AECMA PREN3152 89 W 1012311 000493b O prEN3152 Page4 3. De initions. 3.1 Production batch: Quantity of fin
21、ished nuts fabricated by the same process from a single material cast(s2ngle heat of alloy),having the same basic part number and diameter, heat treated together to the same specified condition and produced as one continuous run. 3.2 Inspection lot: Consists of nuts from a single production batch of
22、 the same part number which completely defines the nut. 3.3 Discontinuities. 3.3.1 Crack: Rupture in the material which may extend in any direction and which may be intercrystalline or transcrystalline in character. an unwelded open fold in the material fins or sharp corners and then rolling or forg
23、ing them into the surface. the material making process. They may exist as discrete particles or strings of particles extending longitudinally. 3.3.2 Seam: Longitudinal surface defect in the form of 3.3.3 Lap: Surface defect caused by folding over metal 3.3.4 Inclusion: Non-metallic particles origina
24、ting from 3.4 Test temperature: Ambient temperature, unless otherwise specified. 3.5 Simple random sampling i): 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. 3-6 Critical defect 1): A defect that
25、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. 3-7 Major defect i): A defect other than critical,
26、that is likely to result in a failure or to reduce materially the useability of the considered product for its intended purpose. 3-8 Minor defect i): A defect that is not likely to reduce materially the useability of the considered product for its intended purpose, or that is a departure from establ
27、ished specification having little bearing on the effective use or operation of this product. 3.9 Sampling plan 1): A plan according to which one or more samples are taken in order to obtain information and possibly to reach a decision. 3-10 prEN3152 Page5 imiting quality LQIO i): In a sampling plan,
28、 a quality level which corresponds to a specified and relatively low probability of acceptance - in this case 10% probability of acceptance. It is the limiting lot quality characteristic that a lot of this quality would occur. When expressed as a per cent defective, it may be referred to as a lot to
29、lerance per cent defective. 3.11 Acceptable quality level i): 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 in
30、spection, can be considered satisfactory as a process average. 3.12 Finished nut : A nut ready for use , inclusive of any possible treatments and/or surface coatings, as specified in the product standard or drawing. 3.13 Drawing : Document specifying all the requirements for nuts i.e. - metallurgica
31、l - geometrical and dimensional - functional strength and temperature classes). 3.14 Self-locking torque : The torque to be applied to the nut or bolt to maintain movement of rotation in . relation to the associated part, the assembly being under no axial load and the nut locking system being comple
32、tely engaged with the bolt(two pitches minimum protrusion including end chamfer). 3.15 Seating torque : The tightening torque to be applied ,o the nut or bolt to introduce or to increase the axial load in the assembly, 3.16 Unseating torque : The untightenng torque to be applied to the nut or bolt t
33、o reduce or remove the axial load in the assembly. 3.17 Breakaway torque : The torque required to start unscre- wing the nut or bolt with respect to the associated part, with the nut locking device still fully engaged on the bolt, but after the axial load in the assembly has been removed by unscrewi
34、ng half a turn folIowed by a halt in rotational movement. 3.18 Wrench torque : The tightening and untightening torques which the driving feature of the nut shall withstand, repeatedly, without any permanent deformation which would prevent the appropriate wrench from being used and preclude reuse of
35、the nut. 4. Certification and quality assurance. The allocation of tests corresponding to the requirements of this standard is as follows: 4.1 Qualification. 4.1.1 4-1.2 4.1.3 4.1.4 Purpose - The purpose of qualification tests is to ensure that the nut design and nut manufacturing conditions allow t
36、he nut to comply with the requirements of this standard. Conditions. The qualification tests summarised in table 3 shall be performed on each type and diameter of nut. Proposed changes in manufacturing source or procedure shall be subject to the requirements of EN3041. 46 nuts selected from a single
37、 inspection lot by simple random sampling shall be subjected to the qualification tests. The number of nuts to be subjected to each test as well as the method(s1 to be used are specified in table 1. The tests to be applied to each nut are shown in table 3. The test programme may possibly be reduced,
38、 this decision will be based on the comparison of results obtained from parts of similar design, size and manufacturing conditions- All or part of these tests may also be performed for production acceptance, when a reinforced inspection seems to be necessary, or to survey nuts that have not proved s
39、atisfactory in use. In that case, the sample to be subjected to these tests is the same as that used for Qualification inspections and tests- Qualification test requirements and procedures. The qualification test requirements and procedures shall be to the requirements of EN3042. Qualified manufactu
40、rers. A list of qualified manufacturers for specific standard parts is listed in CN/TR3040. prEN3152 Page7 4.2 Acceptance. 4.2.1 Purpose. The purpose of acceptance tests is to check, as simply as possible, by a method representative of actual use conditions, with the uncertainty inherant to statisti
41、cal sampling, that the nuts constituting the batch satisfy the requirements of this standard. 4.2.2 Conditions. Acceptance tests are summarised in table 3. They shall be performed on each batch. Table 1 specifies, the test method and sampling plan to be used for each test. Nuts from the batch to be
42、tested shall be selected by simple random sampling. Each nut may be submitted to several tests. The nuts to be subjected to destructive tests may be those on which non-destructive tests have been performed. 4.3 Quality system certification. 4.3.1 Purpose. The purpose of quality system certification
43、is to ensure that the manufacturer has demonstrated the acceptability of his quality system and his ability for continuing production of parts to this standard, to the required level of quality. 4.3.2 Requirements and procedure. The requirements and procedures for quality system certification shall
44、be to the requirements of IS09002 and EN3039. 4.4 Responsibility for inspection and tests. The manufacturer is responsible for the performance of all inspection and test requirements as specified herein. Each manufacturer will use their own or exceptionally, any other facilities approved in accordan
45、ce with 4.1 and 4.2 for the implementation of these inspection and test requirements. 4.5 Inspection and test report. A test report showing actual numerical values shall be provided at the purchasers option as part of the terms of the purchase order. prEN3152 Page8 5. Table 1 Technical requimts and
46、test method. * Q = Qualification approval requimts (4.1). A = Production acceptance requimts (4.2). I 5.2.3 !Threads :Threads shall confori to the :Threads shall be gauged by an: I I 1 I I I 1 I f product standard or drawing . lapproved systei of gauging f I I ;-f-I-:- i- l- l land condition, clean,
47、 sound and I I I I l I :free froi fins, burrs, cracks and I I l I l :other iiperfections detrimental : I l I I I :to their performance, parts shall f I I I I 1 lais0 be free of tool rarks except I I l l I Ithose resulting fror producing the: I I l I l :self locking feature and these I l l l l :must
48、blend swotbly uithout abrupt: I I I I l :change. I l I l I 5.3 I bnufacturing :Nuts MY be manufactured by :Whichever rethod is used I I l Iiachining or forung cfependant ishall be approved. I l I l I :upon the raterial alloued by the f I l I I 1 :product standard or drawing. I I l l :-:-:-:- ; - 1 l
49、 l fbot or cold foriing process. If : I l l I I Ishall not exceed 1150 C. and parts: 1 I I I I :shall be air cooled or faster. I I I 1 I :The heating equipment or forming : I l l l I :shall be of a type which ensures a: I I l I I konsistent teaperature throughout : I I I l I Ithe batch, I I l f 5.2.4 I Quality :Parts shall be unifon in quality :Visual. I l I 1 I I 1
