1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 4234 Edition P 4 November 2013 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONRue Montoyer 10 - 1000 Brussels - Tel. 32 2 775 8126 - Fax. 32 2 775 8131 - www.asd-stan.orgICS: 49.030; 49.080 Supersedes editi
2、on P 3 of September 2008 and will supersede EN 4234:2009Descriptors: ENGLISH VERSION Aerospace series Clamps, worm drive Dimensions, masses Srie arospatiale Colliers vis tangente Dimensions, masses Luft- und Raumfahrt Schellen mit Schneckentrieb Mae, Massen This “Aerospace Series“ Prestandard has be
3、en drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member comments. Subseq
4、uent to the publication of this Prestandard, 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 review by users and formal agreement of ASD-STAN, it will be submitte
5、d as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a national standard and by withdrawing any
6、national standards conflicting with the EN. Edition approved for publication 1st November 2013 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2013 by ASD-STAN prEN 4234:2013 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative referenc
7、es 3 3 Design . 3 4 Required characteristics . 3 Annex A (informative) Standard evolution form . 7 Figure Figure 1 4 Tableaux Table 1 Dimensions . 4 Table 2 Clamp ranges and masses 5 Table 3 Configuration 5 Table 4 Materials and surface treatment . 6 Foreword This standard was reviewed by the Domain
8、 Technical Coordinator of ASD-STANs Mechanical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 4234:2013 (E) 3 1 Scope This Standard specifies the characteris
9、tics of worm drive clamps designed for use with suitable rubber hoses to form joints in fluid system pipelines for aerospace applications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For d
10、ated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2424, Aerospace series Marking of aerospace products EN 2465, Aerospace series Steel FE-PA3901 (X2CrNi18-9) Softened 450 MPa Rm 680 MPa Bar fo
11、r machining 4 mm De 100 mm EN 2516, Aerospace series Passivation of corrosion resisting steels and decontamination of nickel base alloys EN 3077, Aerospace series Clamps worm drive Technical specification 1)EN 3487, Aerospace series Steel FE-PA3601 (X6CrNiTi18-10) Air melted Softened Bar for machini
12、ng a or D 250 mm 500 MPa Rm 700 MPa EN 3488, Aerospace series Steel FE-PA3601 (X6CrNiTi18-10) Air melted Softened Sheet and strip a 6 mm 500 MPa Rm 700 MPa EN 10088 (all parts), Stainless steels 3 Design The housing shall be firmly attached to the band. NOTE Clamps of form N are only equipped with a
13、 stamped band and undrilled, round-headed screw. 4 Required characteristics 4.1 Configuration Dimensions Masses The configuration shall correspond with Figure 1. Details of form not defined are at the manufacturers option. Dimensions shall correspond with Figure 1 and Tables 1 to 3. Sharp edges are
14、not permissible and the inner edges should be rounded or beaded. 1) Published as ASD-STAN Prestandard at the date of publication of this standard. http:/www.asd-stan.org/ prEN 4234:2013 (E) 4 Key 1 Field 1 for marking 2 Field 2 for marking The band is serrated or not according the manufacturer Figur
15、e 1 Table 1 Dimensions Dimensions in millimetres Form b1 b2 b3 b4 b5 b6 d2 d3 e l1 s t max. max. min. max. 0,30 h13 0,05 max. h12 L 16 11,3 12 0,15 1,6 1,9 3,6 0,1 4 0,1 1,2 8 0,7 30 7 2,75 0,25M a 10/16 to 16/27 10,9 8,9 8 0,15 1 1,2 2,7 0,13030,6 20,8 1,35 0,27M a23/35 to 380/400 12 10 2,6 020,7 2
16、2 1,6200,N 7,5 7,3 5 0120,0,9 1 4 0,4 13 1,2020,aAlternative tolerances for M 27; e 0,6 0,05. prEN 4234:2013 (E) 5 Table 2 Clamp ranges and masses Size code d1Mass a Size code d1Mass a min. max. N L M min. max. L M mm g/piece mm g/piece 011 7 11 3,6 190 170 190 55,0 39,4 014 9 14 3,8 200 180 200 56,
17、0 016 10 16 7,9 210 190 210 58,0 019 10 19 4,0 220 200 220 60,0 022 12 b22 24,0 8,5 230 210 230 62,0 027 16 27 25,0 10,6 240 220 240 63,0 44,5 035 23 35 25,5 14,6 250 230 250 64,0 045 25 45 28,0 14,3 260 240 260 66,0 050 32 50 29,0 16,6 270 250 270 68,0 060 40 60 31,0 17,9 280 260 280 70,0 49,5 070
18、50 70 33,0 19,3 290 270 290 72,0 080 60 80 35,0 20,6 300 280 300 74,0 090 70 90 38,0 21,9 310 290 310 75,0 100 80 100 40,0 24,7 320 300 320 76,0 54,5 110 90 110 41,0 26,1 330 310 330 77,0 120 100 120 44,0 27,1 340 320 340 79,0 130 110 130 45,0 30,7 350 330 350 80,0 140 120 140 47,0 360 340 360 82,0
19、59,5 150 130 150 49,0 34,8 370 350 370 83,0 160 140 160 50,0 380 360 380 84,0 170 150 170 52,0 390 370 390 85,0 180 160 180 54,0 400 380 400 86,0 64,5 a Calculated on the basis of a density of 7,85 kg/dm3.bFor form L: d1min. 14. Table 3 Configuration Details of form Code Locking wire hole H (with lo
20、cking wire hole) (without locking wire hole) Shape of head R (round) S (hexagonal) prEN 4234:2013 (E) 6 4.2 Materials and surface treatment See Table 4. Table 4 Materials and surface treatment Material Corrosion resisting steel Surface treatment Code Band Housing Screw According to EN 3488aAccording
21、 to EN 3488aAccording to EN 3487 a passivated according to EN 2516 According to EN 2465apassivated according to EN 2516 A According to EN 3487awithout B According to EN 2465awithout C aAlternative material according to EN 10088. 4.3 Tightening torque Form L: max. 6 N.m. Form M: max. 2,5 N.m. Form N:
22、 max. 0,8 N.m. prEN 4234:2013 (E) 7 Annex A (informative) Standard evolution form MODIFICATION REASON AND VALIDATION Changed undated reference into a dated reference: “EN 2424:2008“ Updated Normative References and other editorial changes Added alternative material according to EN 10088 into Table 4
23、. Allowing alternative materials. Moved Design clause after clause 2. Reordered Chapters (was 3.4, now 3) This is introductory preamble & should be at the start of the spec, not at the end. Added a Hex plain view (no drill hole) to Figure 1. Save confusion. Three end views of screw head were shown. Round plain & drilled. Hex drilled only. Added a Hex plain view (no drill hole) to save confusion. Table 1 Dimensions b4min. was added. No control of slots minimum width was given. Needs to accept standard screwdriver blades.
