1、CEN PRENeq5 90 B 3c10458 0007378 O - A. E, C. M .A. STAN DARD prEN 2945 NORME A.E.C.M.A. Issue P 1 A.E.C.M.A. NORM October 1990 Edition approved for publication DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 Comments sho
2、uld be sent within six months C8 Chairman after the date of publication decision UDC : Key words : ENGLISH VERSION Aerospace series Assembly with self-locking thread inserts Srie arospatiale Assemblage avec filet rapport freinage interne Luft- und Raumfahrt Einbau von selbstsichernden Draht-Gewindee
3、instzen This .Aerospace Series pre-standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de MatrielArospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Commission f
4、ollowing comment by the Member countries. Subsequent to the publication 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 AEC
5、MA Standard Checking Centre (NPS) 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 final vote. 1 990- 1 0-3 1 A.E.C.M.A. 88, Bd. Malesherbes 75008 PARIS - FRANCE Mr. WILLIAMS ae
6、cma 1990 r CEN PRENm27L15 90 3L10Li589 0007377 E M prEN 2945 Page 2 Blank page prEN 2945 Page 3 1 Scope and field of application This standard defines the conditions of fitments of the thread insert, selection of the corresponding bolt, tooling and inspection of the fitted thread insert. All self-lo
7、cking thread inserts defined in standards EN 2942, EN 2944 and EN 3542, 2 References IS0 5855-1, IS0 5855-2, EN 2942, EN 2944, EN 3542, 3 Inser Aerospace - MJ Threads - Part 1 : General. requirements Aerospace - MJ Threads - Part 2 : Limit dimensions for bolts and nuts. Aerospace series - Insert, sc
8、rew thread, helical coil, self- locking, in heat resisting alloy,nickel base alloy (INCO X750- EN 3018), silver plated 1) Aerospace series - Insert, screw thread, helical coil, self- locking, in corrosion resisting alloy Z10CN18-09-EN 2947), unplated 1) Aerospace series - Insert, screw thread, helic
9、al coil, self-locking, in heat resisting alloy, nickel. based alloy (INCO X750 - EN 3018), unplated 1). ion of thread insert The upper turn of the thread insert shall be recessed inside the threaded hole lead-in face by 0.5 to 1.25 turns (see figure 1). Threaded hole lead-in faca vz of 1 Figure 1 1)
10、 Published as AECMA pre-standard at the date of publication of the present standard. CEN PRENmS745 70 m 3404587 0007383 O m 1 prEN 2945 Page 4 . 4 Choice of corresponding bolt The bolt threaded length shall normally be greater than the nominal length of the thread insert, The end of the full form th
11、read on the bolt shall be at least level with the threaded hole lead-in face on the item in which the insert is to be fitted (see figure 2). The end of the bolt shall protrude beyond the insert by a minimum of 2 turns when the basic length of the insert is less than or equal to 2D i), figure 2. The
12、end of the bolt may be recessed inside the thread insert by a maximum of 0.5 turns when the inserts basic length is in excess of 2D 1), figure 4. Figure 2 Fiqure 3 hole lead-in Fiqure 4 face 7 1 2 turnsmin. 1 , turns max. 5 Tooling Insertion, breaking the tang, and extraction if the thread insert ha
13、s to be withdrawn, are to be effected with the tools specified in Appendices 1 and 2. The insertion tooi shall have a threaded front portion which conforms to the requirements in the Appendix. 1) D = Nominal diameter of bolt. prEN 29-45 Page 5 Light alloys Titanium steels 6 Inspection of fitted thre
14、ad inserts 5H6H 5H 4H6H 4H5H . The insert shall be recessed beneath the threaded hole lead-in face, by the values given in para, 4. Diameter code 04 O 50 O60 070 080 100 . The thread tolerance shall be checked as fr as the first deformed coil (length specified in product standard). . Thread min. loc
15、king torque Bolt Dia. x pitch (1) (Nem) tolerance (Associated bolt) . MJ4xO,7 O, 16 MJSxO +8 0,s 034 Os6 Os8 134 MJ6xl MJ7xl MJ8xl MJlOxl,25 4h6h 1 Table 1 Installation in Tolerances 1 fl 4 and 5 .6 to 10 ) as per ) IS0 5855-1 1 , Visually check that the tang has been broken and withdrawn. . The loc
16、king torque shall be checked on samples, against the values in table 2 below. Table 2 CEN PRENm29Li5 90 0 3404589 0007383 4 prEN 2945 Page 6 Appendix 1 Insertion tools Manual Of the. following type or equivalent 4 C Y 4 rn 4 ,I, B i ? Diameter Thread code Dia. x pitch (1) A B C (Associated bolt) Pne
17、umatic Of the following type or Note : These overa equivalent c Diameter code 040 050 060 070 080 100 Thread Dia. x pitch (1) A B C D (Associated bolt) 11 28 32 MJ6xl I 13 I MJ7xl 13 I MJ8xl MJ10x1,25 u/ 42 1 1 1 dimensions are maximum and are given for guidance, .(l) In accordance with IS0 5855-1 a
18、nd 5855-2. 6 CEN PREN*K2945 90 3404589 O007384 b ! - prEN 2945 Page 7 Appendix 2 insertion toois (. ) Profile of insertion tool front portion and wear limit i ametei code 040 O50 - 060 070 - 080 1 O0 reducinq over 02 turn -! 45 d20 I 1 nom. I toi. Thread tria. x pitch (1) (Associated boltj MJ4x0,7 I
19、 3,45 I MJ7xl MJBxl MJlOXl,25 -8,05 (1) in accordance with IS0 5855-1 and 5855-2. I Thread inserts in accordance with EN 2942 - EN 3542 Thread inserts in accordance with EN 2944 limitation nom. tol. limitation nom. tol. limitation nom. toi. limitation 3,35 3,2 3,15 3,2 3,15 4 a3 4,1 3,95 4,l 3,95 5,15 4#9 4,75 4,9 4,75 6,15 5,9 5,75 5,9 5,75 7,15 689 6,75 6,9 6,75. 9 8,7 8,s 8,7 885 -8,115 -8,05 Breaker : With trigger device of the type shown below or equivalent Extractor : Of type shown below or equivalent 10 These overall dimensions are maximum and are given for guidance
