1、June 2008DEUTSCHE NORM English price group 7No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 77.150.10!$O 5000 - 100 05
2、+07+010+100 200 07+09+012+200 320 08+011+- If no fixed or minimum length is specified in the order document, round extruded bars may be delivered in random lengths. The actual lengths and tolerances on random-lengths shall be agreed between supplier and purchaser. DIN EN 755-3:2008-06 EN 755-3:2008
3、(E) 7 3.3 Squareness of cut ends The squareness of cut ends shall be within half of the fixed length tolerance range (Table 3) for both fixed and random lengths, (e.g. for a fixed length tolerance of 10 0 +mm the squareness of cut ends shall be within 5 mm). 4 Tolerances on form 4.1 Ovality Ovality
4、is the difference between the maximum and minimum diameters measured in one cross-section. The maximum permissible ovality is 50 % of the tolerance range specified in Table 2 (e.g. for a diameter tolerance of 0,22 mm, the maximum permissible ovality is 0,22 mm). 4.2 Straightness Deviations from stra
5、ightness, hsand ht,shall be measured as shown in Figure 1 with the round bar placed.on a horizontal base plate so that its mass decreases the deviation. The straightness tolerances are specified in Table 4 (The straightness tolerance htapplies to the whole length, e.g. for a length of 6 m the maximu
6、m deviation from straightness htis the value given in the table multiplied by 6 m). The straightness tolerances apply to round bars in all tempers except O and T x 510. If a straightness tolerance is required for either O or Tx510 temper, it shall be agreed between supplier and purchaser. Key 1 base
7、 plate 2 straight edge Figure 1 Measurement of deviation from straightness DIN EN 755-3:2008-06 EN 755-3:2008 (E) 8 Table 4 Straightness tolerances Dimensions in millimetres Diameter D Over Up to and including Maximum deviation from straightness per metre length ht/length mm/m Maximum localised kink in any 300 mm portion hs 8 80 2 0,6 80 120 2 1,0 120 200 3 1,5 200 320 6 3,0 DIN EN 755-3:2008-06 EN 755-3:2008 (E) 9 Bibliography 1 EN 515, Aluminium and aluminium alloys Wrought products Temper designations DIN EN 755-3:2008-06
