1、STD=AECMA PREN 4303-ENGL 3999 = LO32333 0037377 T85 AECMA STANDARD prEN 4303 NORME AECMA Edition P 1 AECMA NORM December 1999 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - 51200 BRUXELLES - Tel. (+32) 2 T15 81 10 - Fax. (+32) 2 775 81 11 ICs: 49.030.50 Descrip
2、tors: aircraft industry, sleeve, flush head screw, corrosion resistant steel, classification, dimension, surface treatment, designation, marking ENGLISH VERSION Aerospace series Sleeves, tubular, for tension screws with flush head, in corrosion resisting steel, passivated, (0,25 mm wall thickness) S
3、rie arospatiale Luft- und Raumfahrt Douilles tubulaires, Hlsen pour vis de traction tte fraise, en acier rsistant la corrosion, passives, (paisseur de paroi 0,25 mm) fr Senkschrauben mit Zugbeanspruchung, aus korrosionsbetndigem Stahl, passiviert, (Wanddicke 0,25 mm) This %Aerospace Series“ Prestand
4、ard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA- Members. It has been technicaly approved by the experts of the concerned Technical Commrttee following comment by the Member countries. S
5、ubsequent 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 signature of the AECMA Standard Checking Centre (NPS) and formal
6、 agreement of the Oficial Semices of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.NA. - Technopolis 54 - 199, rue Jean-Jaques Rousseau - 92138 ISSY-LES-MOULINEAUX CEDEX
7、 I I Edition approved for publication 1 Comments should be sent within six months aiter the date of publication to 1999-1 2-31 AECMA Gulledelle 94 B-1200 BRUXELLES C3 Chairman Mr Visconti STD.AECMA PREN 4303-ENGL 1999 N 30L2333 0037378 911 = Page 3 prEN 4303: 1999 I Scope This standard specifies the
8、 characteristics and technical requirements of tubular sleeves for tension screws with flush head, which may be plain or provided with a series of annular grooves, in corrosion resisting steel, passivated, with a 0,25 mm wall thickness, for maximum operating temperature 650 OC, for aerospace applica
9、tions. 2 Normative references IS0 2859-1 Sampling procedures for inspection by attributes - Part I: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection EN 2175 Aerospace series - Heat resisting alloy FE-PA2602 (X4NiCrTiMoV26-15) - Solution treated and precipitation t
10、reated - Sheet, strip and plate - 0,5 mm I a 5 10 mm - R, 2 850 MPa 1) EN 2424 Aerospace series - Marking of aerospace products EN 2516 Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel base alloys 3 Terms and definitions For the purposes of this standard, th
11、e following terms and definitions apply. 3.1 crack rupture in the matrial which may extend in any direction and which may be intercrystalline or transcrystalline in character 3.2 seam open surface defect which is the result of the extrusion of the matrial 3.3 surface defect caused by folding over me
12、tal fins or sharp comers and then rolling or forging them into the surface lap 4 Required characteristics 4.1 See figure I and tables 1 and 2. Dimensions and tolerances are expressed in millimetres and apply after surface treatment. Configuration - Dimensions - Masses 4.2 Material EN 2175, received
13、in the annealed condition and cold work during manufacture 4.3 Surface treatment EN 2516 1) Published as AECMA Prestandard at the date of publication of this standard Previous page is blank STDeAECMA PREN 4303-ENGL 1779 M 1012311 0017379 858 R + 0,25 - 0,05 0,s Page 4 prEN 4303: 1999 z 7 6 5 - 7 7 V
14、alues in micrometres apply prior to sufiace treatment. Remove sharp edges 0,l to 0,2. Plain form (code “P) Grooved form (code “G) a Key I Z: Number of grooves. The Pitch of groove = 2 a Unspecified dimensions: as plain form At manufacturers option Form of groove at manufacturers option b Figure I Ta
15、ble 1 cri X (20:l) 9 I z 0- O0 Ln t STDmAECMA PREN 4303-ENGL le199 = 30323LL 0037380 57T Page 5 prEN 4303: 1999 Diameter code Table 2 050 060 080 I O0 i 20 Length 7 Mass 1 See figure 1. Approximate values (kg/l O00 pieces), calculated on the basis of 7,85 kg/dm3, given for a information purposes onl
16、y STDSAECMA PREN 4303-ENGL 3999 LOL23l1h OOL738L 40b Page 6 prEN 4303: 1999 5 Designation Length code (see table 2) NOTE If necessary, the code 19005 shall be placed between the description block and the identity block. 6 Marking EN 2424, style G 7 Technical specification 7.1 Manufacture The sleeves
17、 shall be formed by a drawing process from sheet or strip stock to form a one piece tubular section and head. 7.2 Surface appearance The sleeves shall be free from cracks, seams and laps. Under visual examination, the sleeves may show axial flow lines in the tubular section typical of a drawn sleeve. The flow lines shall be continuous at the fillet radius. A slight visible orange peel effect is also permissible. 7.3 Sampling In conformity with IS0 2859-1, using normal or reduced inspection methods. The acceptance quality limit (AQL) is 1 %.
