1、I CEN PRENgZ943 90 U 3404589 0007353 b U _ - - A. E. C. M. A. STAN DARD NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 2943 Issue P 1 October 1990 EDIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AEROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 ENGLISH VERSION Aerospace series
2、Wire thread inserts, prevailing torque (self-locking) Technical specification Srie arospatiale Filets rapports, freinage interne Spcification technique Luft- und Raumfahrt Draht-Gewindeeinstze, selbstsichernd Technische Lieferbedingungen This .Aerospace Series. pre-standard has been drawn up under t
3、he responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Commission following comment by the Member countries. Subsequent to the publicat
4、ion of this pre-standard, the technical content shall 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 Offici
5、al Services of the Member countries it will be submitted as a draft European Standard 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
6、 be sent within six months after the date of publication decision A.E.C.M.A. 88, Ed. Malesherbes 1990-1 0-31 75008 PARIS FRANCE C8 Chairman Mr. WILLIAMS aecma 1990 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo repro
7、duction or networking permitted without license from IHS-,-,-CEN PRENmZ943 90 W 3404589 0007354 8 i1 prEN 2943 Page 2 Contents 1) Scope and field of application 2) References 3) Definitions 3.1) 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 3.10) Limiting quality 3.1 1) Acceptable quality level 3.12) Finished thread insert 3.13) Definition document 3.14) Prevailing tore 3.15) Clamping torque 3.16) Unclamping torque 3.1 7) Breakaway torque 4) Certification an
9、d quality assurance 4.1) Qualification 4.2) Acceptance 4.3) Quality system certification 4.4) Responsibility for inspection and tests 4.5) Inspection and test report 5) Table 1 : Technical requirement and test methods 5.1) Material 5.2) Geometric and dimensional characteristics 5.3) Manufacturing 5.
10、4) Mechanical properties 5.5) Metallurgical properties 5.6) Product identification 5.7) Delivery Table 2: Summary of tests - Qualification and production acceptance Table 3: Qualification testing requirements for thread insert samples Table 4: Locking characteristics Table 5: Prevailing torques, tes
11、t equipment, types of blocks Table 6: Description of test methods Table 7: Values for Breakaway torque, Prevailing torque and Clamping torque Table 8: Sampllng plans for production acceptance tests Appendix 1 : Definition of maximum the maximum quantity in a primary package shall be 500. The various
12、 primary packages forming part of the same consignment may be combined to form a collective package. Q = Qualification approval requirements (4. nents (4 A = Production acceptance Inspection and test method Locking characteristics: See Table 4 Test equipment: See Table 5 Test methods: See Table 6 No
13、te: The same test sample may be utilised for more than one test provided that none of the characteristics of the samples are altered during the examination procedure (see Table 3). Visual examination Visual examination QIA A - - Q A - A A - Sample size See Table 8 32 Table 8 100% 100% Copyright Asso
14、ciation Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I CEN PREN*Zq3 90 3904589 O007363 5 _ - prEN 2943 Page 9 5 Table 1: Technical requirements and test methods Q = Quali
15、fication approval requirements (4.1) A = Production acceptance requirements (4.2) :lause 5.7.2.1 - - 5.7.2.2 - Characteristic Labelling on a primary package Labelling on collective package Technical requirement A label shall be affixed to each primary package or placed inside provided that it can be
16、 seen without having to open the package. Labels shall be positioned irr such a way that they are not damaged when the package is opened; they shall contain the following information: . EN part number , manufacturers company name and monogram . description of the item as specified in the Product Sta
17、ndard . references of manufacturers batch number . quantity A label shall also be affixed to each package comprising several individual packages; this label shall contain at least the following information: . manufacturers company name and monogram Inspection and test method Sample size SW 5.7.2 See
18、 5.7.2 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-,-,-Table 2: Summary of tests - Qualification and production acceptance I CEN PREN*:2943 90 3404589
19、0007362 7 1 prEN 2943 Page 10 Qualification Production Acceptance Clause Sample Clause Sample Size Type of Test size Material 5.1 4 Thread insert un-engaged: Dimensions I 5.2.1.1 I 35 I 5.2.1.1 1 Table 8 Thread insert installed: Tapped hole Break-off notch Length Surface Condition 5.2.2.1 4 5.2.2.1
20、Table 8 5.2.2.2 4 5.2.2.2 Table 8 5.2.2.3 4 5.2.2.3 Table 8 5.3.1 35 5.3.1 Table 8 Surface Roughness 5.3.2 3 5.3.2 Table 8 Surface Coating 5.3.3 32 5.3.3 Table 8 Permanent set 5.4.1.1 3 Reusability:- 3-cycle ?As received? 5.4.1.4 Table 8 Product identification 5.6 32 5.6 Table 8 1 5-cycle ?As receiv
21、ed? 5.4.1.2 10 5-cycle ?After bake? 5.4.1.3 10 Packaging 5.7.1 100% Labelling A 5.7.2 100% 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-,-,-O iT .- u Li
22、 y. - o)- nu - U 44 $ c O c ti - prEN 2943 Page 11 I -I - I l 1% :x I -I - :x i% :x ix :x i% :c i% :x ix :x i% :u ix :x ix :x i% :x ix :x ;x :x IK :x :x ix ix :% ;x :% I% :x ;Y :x Ix :u ix :x ix :x tx :x i% :x ix :x ix :x Ix :x ix :x ix :x ix :x Ix . -* - I -I - I - L - r 3- I - e -I - I - 1 - I -a
23、- I -1 - e -I - , -I - I I -I I I- # - I -I - :x I -I - e -I- I -I- l I lx ;x . -I - I -a - I -I - I -I - I -I - I -r - *-I - I -I - , - 1 - I -I - :x I -CI - .-I - I -e - I -I - :K :x I -I - I -I - -, -, - ! I - - -A- I I I I . I t I I I l I CI o) v e n. - Copyright Association Europeene des Constr
24、ucteurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Table 4: Locking Characteristics Brief Description of Test on maxlmin mandrels one cycle screwinglunscrewing Test Method Type of Test 2O0C I SeeT
25、able6 Permanent set 15 cycles screwinglunscrewing bolt loaded during each cycle 2O0C 15 cycles “as recieved” See Table 6 After subjecting the boltlblock assembly to the maximum test temperature of the thread insert See Table 6 5 cycles screwinglunscrewing bolt loaded during each cycle 5 cycles “afte
26、r bake” 2O0C 1 See Table 6 bolt loaded during each cycle 3 cycles screwinglunscrewing 3 cycles “as received” Table 5a: Prevailing Torques, Test Equipment Test Blocks Spacer Type of Test Bolt or Mandrel Mandrels defined in Appendix 1, Figure 2, Table 9 Permanent set Thread Thread insert in inseri in
27、Inconel stainless x750 steel Type B Type A Bolt defined in Appendix 2, Figure 3, Table 10 Defined in Appendix 3, Figure 4, Table 11 15 cycles “as received” Bolt defined in Defined in Appendix 3, Figure 4, Table 11 5 cycles “after bake” Appendix 2, Figure 3, Table 10 Thread Thread insert in insert in
28、 Inconel stainless x750 steel Type B Type A Bolt defined in Appendix 2, Figure 3, Table 10 Defined in Appendix 3, Figure 4, Table 11 3 cycles “as received” Table 5b: Prevailing Torque, Type of Block Block Material Hardness Thickness Tapped Hole stainless steel HV30 2 276 (I L = basic length of threa
29、d insert 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-,-,-prEN 2943 Page 13 e 6: DescriDtion of Test Methods Types ( 15 cycles “as eceived “ X X X X X X
30、 X X 15 Test Methods ermaneni set Lubricate the bolt (see Appendix 2, Figure 3, Table 10) using synthetic engine oil. Place the bolt in the spacer (see Appendix 3, Figure 4, Table 1 l), fit the bolt in the thread insert installed in a test block (see Table 5) until it protrudes at least 2 pitches be
31、yond the lockina zone of the thread insert Unscrew, removing the bolt completely from the 2 - 3 Screw up again until the bolt protrudes at least 2 pitches beyond the locking zone of the thread insert, measuring the prevailing torque on screwing (see Table 7, column 3 for the 15 cycle and 3 cycle tes
32、ts, column 4 for the 5 cycle test). Load the various elements (see Table 7, column 5 and Amendix 4, Fiuure 5) Heat the assembly in an oven at the maximum test temperature of the thread insert +. 10C for 6 hours f 15 minutes, take it out of the oven and let it cool down to ambient temDerature. Remove
33、 the load from the thread insert by unscrewing by at least one half turn and until the sDacer can be moved freely. Repeat the unscrewing operafion, measuring the breakaway torque (see Table 7, column 1) Unscrew measuring the breakaway torque (See Table 7, columns 2a and 2b Lubricate the maximum mand
34、rel (see Appendix 1, Figure 2, Table 9) using synthetic enaine oil, Fit the maximum mandrel in the thread insert installed in a test block (see Table 5) until it protrudes at leasf 2 pitches beyond the rocking zone of the thread insert, measuring the prevailing torque on screwing (see Table 7, colum
35、n 3). Unscrew, removing the maximum mandrel completely from the thread insert. Carry out the same chronological sequence of operations using the minimum mandrel (see Appendix 1 , Figure 2, Table 9), measuring the breakawav torque (see Table 7, column 1) Remove the assembly. After cleanina bolt or ma
36、ndrel shall be reuseable. Number of cycles on the same eiements. Repeat operations 1 and 4 onwards for each cycle. 4 - 5 X X 6 X 7 a - 9 X 10 11 12 13 X X 14 1 513 When screwing and unscrewing, the rotation of the thread insert in its location shall not exceed NOTE: The rotation of the test bolts an
37、d mandrels shall be sufficiently slow so that the 2 9oQ temperature of the thread insert does not exceed 45OC during the operations. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted
38、 without license from IHS-,-,-CEN PRENW943 90 m 3Wt589 00073bb L1 U ! prEN 2943 Page 14 Table 7: Values for Breakaway torque, Prevailing torque and Clamping torque In accordance with IS0 5855/1 and IS0 5855/2. Note: i Minimum breakaway torque for 15 cycle, 5 cycle and permanent set tests. 2a) Minimu
39、m breakaway torque for the first cycle of the 3 cycle test. 2b) Minimum breakaway torque for the second and third cycles of the 3 cycle test. 3) Maximum prevailing torque for the 15 cycle, 3 cycle and permanent set tests. A torque value 20% higher than the maximum torque, shall be acceptable for the
40、 permanent set test. Maximum prevailing torque for the 5 cycle test. 5 3 Clamping torque for the 15 cycle, 5 cycle and 3 cycle tests Table 8: Sampling plans for production acceptance tests. All other production acceptance tests The degree of sampling in Table 8 is based on the single sampling plans
41、for normal inspection specified in IS0 2859. Other sampling plans from IS0 2859 may be used which give the same guarantee of quality. Where the size of the sample is the same as or greater than the size of the batch, a 100% check is necessary. Copyright Association Europeene des Constructeurs de Mat
42、eriel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- CEN PREN*:2943 90 W 340q587 00073b7 - 6JllIl prEN 2943 Page 15 a Appendix 1 Definition of maximum & minimum mandrels for the permanent set test Diameter Threa
43、d Pitch diameter (d2) Code D x pitch (1) (associated Maximum Minimum On d2 bolt mandrel mandrel L (see below i-i 040 O50 I 45O -t- 5 L- Remove sharp edges MJ4 x 0,7 3,530 3,439 MJ5 x O,8 4,464 4,420 Figure 2 060 070 Material: Finish: None Steel heat treated to HRcr39. MJ6 x 1 5,333 5,279 +O -0,Ol MJ
44、7 x 1 6,333 6,279 (D - 1,3 pitchE: 080 1 O0 Thread I MJ8 x 1 7,332 7,279 MJlOx 1,25 9,169 9,113 f Surface R0ughness:Thread flanks to be 0,8 pm Ra. Thread: IC05855 except pitch dia. (See Table 9 below) Thread Length L shall allow the mandrel to be fitted with a projectman o least 2 pitches beyond the
45、 locking zone of the thread insert. at Table 9 Dimensions in millimetres ToIerances On half angle k15 On pitch &0,008 whatever the pitch (1) In accordance with IS0 5855/1 and IS0 5855/2 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMA
46、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-CEN PRENx2943 90 m 3404589 0007368 8 I prEN 2943 Page 16 Appendix 2 Definition of test bolt for the reusability tests . , L (see below) I I Figure 3 Material: NI-P100-HT to prEN2404, or steel of hardness HV30 1 334 fo
47、r acceptance tests (3 cycle) Coating: See Table 10. Surface Roughness:Thread flanks to be 0.8 pm Ra. Thread : 1805855/1 i 1805855/2 Class 4h6h after coating (where applicable), rolled thread form. Thread length L shall allow the boit to be fitted with a projection of at least 2 pitches beyond the lo
48、cking zone of the thread insert In accordance with 1803353. Thread runout: Table 10 Coating of the thread insert to be tested EN 2786 Test bolt coating Silver None None Silver EN 2786 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-,-,-I i Diameter Code 040 050 Appendix 3 Definition of spacer for the prevailing torque tests with loading Thread D x pitch (Insert fitted) L (*I MJ4 x 0,7 30 M35 x 0,8 30 0,2/0,3 Chamfer x 45 r5 08
