1、AECMA PREN2257 77 10123Ll 0002670 O A.E.C.M.A. STANDARD NORME A.E.C.M.A. A.E.C.M.A. NORM DRAFT prE N 2257 Edition 1 January 1979 ENGLISH VERSION CIRCULAR STRUCTURAL TUBES IN ALUMINIUM AND ALUMINIUM ALLOYS DIMENSIONS AEROSPACE SERIES TUBES CIRCULAIRES RUNDE KONSTRUKTIONSROHRE POUR CONSTRUCTION AB MES
2、SU N GE N EN ALUMINIUM ET ALLIAGES DALUMINIUM AUSALUMINIUM UND ALUMINIUM-LEGIERUNGEN DIM E NSIONS LUFT-UND RAUMFAHRT SERIE AEROSPATIALE The text of this standard, which exists in three equivalent versions (English, French, German) has been drawn up under the responsability of A ECMA (Association Eur
3、openne des Constructeurs de Matriel Arospatial) and has been circulated to Official Services Any reservations expressed by Official Services and not resolved in this issue, have been incorporated in the history sheet which has accompanied this prEN to CEN. It is published on yellow paper as a draft
4、European Standard intended to receive, under the same presentation and according to its own rules, the approval of CEN (European Committee for Standardization). Approved by The equivalent versions in French and German languages cn COMITE DE NORMALISATION be supplied by B.N.A.E., 8, rue Moreau-Vauthi
5、er Of A.E.C.M.A. 1977-12-16 92100 BOULOGNE-BILLANCOURT - FRANCE. i AECMA PREN2257 77 W LOL23LL 0002b7L 2 W prEN2257 page 2 CONTENTS 1 SCOPE AND FIELD OF APPLICATION 2 REFERENCES 3 MATERIALS 4 REQUIRED CHARACTERISTICS 5 DESIGNATION 6 MARKING 7 TECHNICAL SPECIFICATION a AECMA PREN2257 79 W LOL23LL 000
6、2672 4 W prEN2257 page 3 DRAFT EUROPEAN STANDARD AEROSPACE SERIES prEN225 7 CIRCULAR STRUCTURAL TUBES IN ALUMINIUM AND ALUMINIUM ALIDYS D IMENS IONS 1 SCOPE AND FIELD OF APPLICATION This standard specifies the dimensions and tolerances of circular aluminium and aluminium alloys structural tubes used
7、 in aerospace construction. 2 REFERENCES IS0 2964-1974, Aircraft - Tubing outside diameters and thicknesses, Metric EN20 70- 1 dimens ions. Inspection and testing requirements for aluminium and alumi- nium alloys wrought products - General requirements i), EN2070-4 Inspection and testing requirement
8、s for aluminium and alumi- nium alloys wrought products - Inspection and testing requi- rements for tubes 1). 3 MATERIALS The materials are defined in the material standards and Technical Specification. 4 REQUIRED CHARACTERISTICS 4.1 Preferred dimensions The external diameters,.thicknesses, toleranc
9、es and the linear mass of tubes are defined in table 1. When other sizes are required they shall be taken from IS0 2964. i) In preparation. AECMA PREN2257 77 U LO123LL 0002b73 b TABLE 1 - Preferred dimensions, mass Dimensions in millimetres - Code A B C 0 E F G H J K L M N P Q R - - Dimensions thick
10、ness - s 17% _- (kg/rn) Mass -7-T- 0,12 - 0115 - 0,17 - OJO 025 023 028 026 0,32 -. - - - - _- 8 ?r 0.08 -1- 10 12 -I 0,080 I 0,093 0,097 IO,11 I_ .- - I- 14 16 18 _ 0.17 32 40 f 0,15 50 - O ,80 0,54 0,67 I 0, OS4 0,86 l, i Il 1,4 -t- - - - - - 1 0,2 80 f 025 1 O0 1) Calculated on the basis of 2,8 k
11、g/dm3. 4.2 Length tolerances The tolerances on the length of tubes are given in table 2. TABLE 2 - Length tolerances Dimensions ln millimetres Length L L 1000 L 3 1000 4- 10 O 4.3 Concentricity tolerances The concentricity shall be contained within the tolerances allowed for the thickness in table 1
12、. 4.4 Out of round tolerances This is the difference between the maximum and minimum diameters at the same section. It shall be contained within the tolerance on diameter in table 1. 1 AECMA PREN2257 79 W LO12311 0002b74 B W : prEN2257 page 5 1,7 mm 4.5 Straighness tolerances For tubes supplied in s
13、traight lengths the departure from straightness shall not exceed 1,7 mm per 1000 mm. 1000 mm 4.6 Surface condition 5 The surface condition of the tubes shall conform to the requirements of the Technical Specification, 5 DESIGNATION The designation of products defined in this standard may include the
14、 following elements : a) name, b) number of this dimensional standard, c 1 dimensions, d) number of material standard, Example : Tube EN2257 - 20 x 1,6 ENZ073 NOTE - When the designation is to be codified, dimensions shall be replaced by the code letters in tabla 1 of this standard. 6 MARKING Marking of the semi-finished products defined in this standard shall comply with the requirements of EN2070-1 11, 7 TECHNICAL SPECIFICATION Tubes supplied to this standard shall conform to the requirements of EN2070-1 1) and EN2070-4 1). i) in preparation,
