1、BRITISH STANDARD AEROSPACE SERIES Semi-finished metallic products - Methods of measuring form deviations The European Standard EN 3848:ZOOl has the status of a British Standard ICs 49.035 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 3848:2001 BS EN 3848:ZOOl Amd. No.
2、National foreword Date Comments This British Standard is the official English language version of EN 3848:2001. The UK participation in its preparation was entrusted to Technical Committee ACEI61, Inspection and testing requirements for aerospace metallic materials, which has the responsibility to:
3、- - aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations r
4、epresented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Corresp
5、ondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A Bntish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not o
6、f itself confer immunity from legal obligations. This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 23 October 2001 Summary of pages This document
7、 comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Q BSI 23 October 2001 ISBN O 580 38607 4 EUROPE
8、AN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3848 September 2001 ICs 49.035 English version Aerospace series - Semi-finished metallic products - Methods of measuring form deviations Srie arospatiale - Demi-produits mtalliques - Mthodes de measure des dfauts de forme Luft- und Raumfahrt - Metallisc
9、hes Halbzeug - Meverfahren fr Formabweichungen This European Standard was approved by CEN on 2 May 2001 CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
10、 Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation un
11、der the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland. Ireland, Italy, Luxe
12、mbourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FUR NORMUNG Management Centre: rue de Stascart, 36 6-1050 Brussels O 2001 CEN All rights of exploitation in any form and by
13、any means reserved worldwide for CEN national Members. Ref. No. EN 3 - folded sections: see EN 2065. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text
14、 and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies
15、. EN 2065 EN 2066 IS0 1101 3 Folded profiles - Aluminium alloys - General tolerances - Aerospace series Aerospace series - Extruded sections in aluminium alloys - General tolerances Technical drawings, geometrical tolerancing; tolerances of form, orientation, location and runout; generalities, defin
16、itions, symbols of drawings M easu ring condi ti on The dimensions shall be measured using measuring instruments which are of the accuracy required by the dimensions and the dimensional tolerances. All dimensions shall be checked at the ambient temperature of the workshop or laboratory, and, in the
17、event of dispute, at a temperature between 15 “C and 25 OC. Surface plates used for the measurement of form deviations shall be flat to within I 1 % of the requisite product form deviation being measured. 4 Sheet and plate 4.1 Squareness The squareness deviation shall be measured as the difference i
18、n length of diagonals AA and BB as shown in figure 1. 4.2 Lateral curvature The lateral curvature (f) shall be measured as indicated in figure 2, with the sheet or plate resting on a horizontal surface plate. 3 . . . . I EN 3848:2001 (E) 4.3 Flatness 4.3.1 Flatness tolerance zone See IS0 1101. The t
19、olerance zone is limited by two parallel planes a distance “I“ apart. The area shall be between two parallel planes with distance “t“. See figure 3. 4.3.2 Measurement Deviation from flatness (0 resulting from arching, buckling or edge waves, shall be measured as shown in figures 4 to 6, using a ligh
20、tweight straight-edge and a feeler gauge, dial gauge or scale, with the sheet or plate resting on a horizontal surface plate concave side upwards, except when the size of the product precludes this. 5 Round bar 5. I Straightness Deviation from straightness (Y,) per metre of total length (X,), expres
21、sed in mm/m, and (Y,) on any length (X2), as specified in the dimensional standard, shall be measured as shown in figure 7, with the bar placed on a surface plate so that its mass minimizes the deviation. 5.2 Roundness Roundness deviation shall be measured as the difference between the maximum and m
22、inimum diameters at the same cross-section. 6 Hexagonal bar 6.1 Straightness Deviation from straightness (Y,) per metre of total length (X,), expressed in mmlm, and (Y,) on any length (X,), as specified in the dimensional standard, shall be measured as shown in figure 7, with the bar placed on a sur
23、face plate so that its mass minimizes the deviation. 6.2 Twist Twist (v) shall be measured as shown in figure 8, with the bar placed on a horizontal base plate so that its mass minimizes the deviation. Twist is the maximum distance, at any point along the measuring length between the bottom surface
24、of the bar and the surface plate. 6.3 Surface flatness Surface flatness (0 shall be measured on all faces as shown in figure 9. 4 EN 3848:2001 (E) 7 Square and rectangular bar 7.1 Straightness Deviation from straightness (Yl) per metre of total length (Xi), expressed in mmlm, and (Y,) on any length
25、(X,), as specified in the dimensional standard, shall be measured as shown in figure 7, with the bar placed on a surface plate so that its mass minimizes the deviation. 7.2 Twist Twist (v) shall be measured as shown in figure 10, with the bar placed on a horizontal plate so that its mass minimizes t
26、he deviation. The twist is the maximum distance, at any point along the measuring length between the bottom surface of the bar and the surface plate. 7.3 Squareness The squareness deviation (z) shall be measured as shown in figure 11. 7.4 Surface flatness Surface flatness (Fj shall be measured on al
27、l faces as shown in figure 12. 8 Circular tube 8.1 Straightness Deviation from straightness (Y,) per metre of total length (X,), expressed in mm/m, and (Y,) on any length (Xz), as specified in the dimensional standard, shall be measured as shown in figure 7, with the tube placed on a surface plate s
28、o that its mass minimizes the deviation. 8.2 Roundness Roundness deviation shall be measured as the difference between the maximum and minimum outside diameters at the same cross-section, see figure 13. 8.3 Eccentricity Eccentricity (i) shall be measured as half the difference between the maximum an
29、d the minimum wall thickness at the same cross-section, as shown in figure 14. 5 . ,- , EN 38482001 (E) A. Figure 1 - Squareness of sheet and plate Side edge (concave side) tr FI J Straight-edge korb F = lateral curvature length of the sheet or plate b = width of the sheet or plate = Figure 2 - Late
30、ral curvature of sheet and plate Figure 3 - Definition of flatness 6 EN 3848:2001 (E) a= b= I= f= t= fmx. = w= t= thickness of the sheet or plate width of the sheet or plate length of the sheet or plate length of the wave deviation from flatness tolerance zone (space between two parallel planes) max
31、imum acceptable deviation from flatness a+ fmx Figure 4 -Arching of sheet and plate Straight-edge W FI- Surface plate I I f = deviation from flatness W = length of buckle (chord) Figure 5 - Buckling of sheet and plate 7 EN 3848:2001 (E) Straight-edge 1 Surface plate I. fj f = deviation from flatness
32、 W = length of edge wave (chord) Figure 6 - Edge waves of sheet and plate Surface plate I I I I I I I XI YI = deviation from straightness on total length Xi Y2 = deviation from straightness on length XZ Figure 7 - Deviation from straightness of bar and tube Surface plate Y = twist a = across flat of
33、 the bar Figure 8 - Twist of hexagonal bar 8 EN 38482001 (E) Side edge (concave face1 , Straight-edge F = deviation from surface flatness a = across flat of the bar Figure 9 - Surface flatness of hexagonal bar Surface plate 7 v = twist a = thickness of the bar Figure 10 - Twist of square and rectang
34、ular bar z = squareness deviation Figure 11 - Squareness deviation of square and rectangular bar 9 EN 3848:2001 (E) r Straight-edge -* Side edge - (concave face) / F = deviation from lateral flatness a = thickness of the bar b = widthof the bar Figure 12 - Surface flatness of square and rectangular
35、bar I 23 c O cl 1 - Roundness deviation = kx. - “. 2 Figure 14 - Eccentricity of tube 10 BS EN 3848:2001 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution 3SI is the independent national body responsible for preparing British Standards. It presents the UK view on standards
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