1、June 2008DEUTSCHE NORM English price group 8No 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 10 100 0
2、5+07+010+100 200 07+09+012+200 220 08+011+014+If no fixed or minimum length is specified in the order document, square extruded bars may be delivered in random lengths. The actual lengths and tolerances on random lengths shall be agreed between supplier and purchaser. 3.4 Squareness of cut ends The
3、squareness of cut ends shall be within half of the fixed-length tolerance range (Table 4) 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 forms 4.1 Straightness Deviations from straightness, hsand ht,
4、shall be measured as shown in Figure 1 with the square bar placed on a horizontal base plate so that its mass decreases the deviation. The straightness tolerances are specified in Table 5 (The straightness tolerance htapplies to the whole length, e.g. for a length of 6 m the maximum deviation from s
5、traightness htis the value given in the table multiplied by 6 m). The straightness tolerances apply to square bars in all tempers except O and Tx510. lf a straightness tolerance is required for either O or Tx510 temper, it shall be agreed between supplier and purchaser. DIN EN 755-4:2008-06 EN 755-4
6、:2008 (E) 8 Key 1 base plate 2 straight edge Figure 1 Measurement of deviation from straightness Table 5 Straightness tolerances Dimensions in millimetres Width across flats S Over Up to and including Maximum deviation from straightness per metre length ht/length mm/m Maximum localised kink in any 3
7、00 mm portion hs 10 80 2 0,8 80 120 2 1,0 120 220 3 1,5 4.2 Convexity - Concavity The convexity - concavity for square bars shall be included within the width across flats tolerances as given in Table 2. 4.3 Twist The twist measurement shall be carried out as shown in Figure 2. The twist tolerances
8、are specified in Table 6. The twist tolerances apply to square bars in all tempers except O and Tx510. If a twist tolerance is required for either O or Tx510 temper, it shall be agreed between supplier and purchaser. DIN EN 755-4:2008-06 EN 755-4:2008 (E) 9 Key 1 base plate Figure 2 Measurement of t
9、wist Table 6 Twist tolerances Dimensions in millimetres Width across flats S Twist tolerances T Over Up to and including Per 1 000 mm of length Over the total length 10 30 1 3 30 50 1,5 4 50 120 2 5 120 220 3 6 4.4 Squareness The deviation from square shall be measured as shown in Figure 3. Squarene
10、ss tolerances are specified in Table 7. DIN EN 755-4:2008-06 EN 755-4:2008 (E) 10 Figure 3 Measurement of deviation from square Table 7 Squareness tolerances Dimensions in millimetres Width across flats S Over Up to and including Maximum deviation from square Z 10 100 0,01 x width 100 180 1,0 180 220 1,5 DIN EN 755-4:2008-06 EN 755-4:2008 (E) 11 Bibliography 1 EN 515, Aluminium and aluminium alloys Wrought products Temper designations DIN EN 755-4:2008-06
