DIN 6935 Bb 1-2011 Cold bending of flat rolled steel - Supplement 1 Factors determining the correction value for calculating length of flats prior to bending《平轧钢冷弯加工 补充件1 决定扁钢冷弯加工前.pdf

1、 October 2011 DIN 6935 Supplement 1 ICS 77.140.50 Supersedes DIN 6935 Supplement 1:201001 Cold bending of flat rolled steel Supplement 1: Factors determining the correction value for calculating length of flats prior to bending, English translation of DIN 6935 Supplement 1:2011-10 Kaltbiegen von Fla

2、cherzeugnissen aus Stahl Beiblatt 1: Faktoren fr Ausgleichswert zur Berechnung der gestreckten Lnge, Englische bersetzung von DIN 6935 Beiblatt 1:201110 Cintrage froid des produits plats en acier Supplment 1: Facteurs pour la valeur de compensation pour le calcul de lallongement, Traduction anglaise

3、 de DIN 6935 Supplment 1:201110 Document comprises 4 pages Translation by DINSprachendienst. In case of doubt, the Germanlanguage original shall be considered authoritative. No part of this standard may be reproduced without prior permission of DIN Deutsches Institut fr Normung e. V., Berlin. Beuth

4、Verlag GmbH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DINNormen). English price group 4 www.din.de www.beuth.de !%)I“ 2069638 This supplement provides information relating to DIN 6935, but does not contain any additional specifications. 11.13 DIN 6935 Suppl. 1:201

5、1-10 2 A comma is used as the decimal marker. Foreword This Supplement has been prepared by Working Committee NA 026-00-03 AA Stanzteile of the Normenausschuss Federn, Stanzteile und Blechformteile (NAFS) (Springs, Stamped Parts and Moulded Parts Standards Committee). For more information on NAFS, v

6、isit our website at www.nafs.din.de. Amendments This standard differs from DIN 6935 Supplement 1:2010-01 as follows: a) references have been updated; b) the Supplement has been editorially revised. Previous editions DIN 6935 Supplement 1: 1958x-01, 1967-05, 1975-10, 2010-01 DIN 6935 Suppl. 1:2011-10

7、 3 Calculation of compensating value based on the equation )( szkyrx += for determining the developed length according to DIN 6935: EXAMPLE Sheet thickness s = 2 mm Bending radius r = 2,5 mm Opening angle = 110 The values for x, y and z shall be extracted from the diagram (see Figure 1), value k fro

8、m the diagram according to DIN 6935:2011-10, Clause 7 (Figure 7). k = 0,70 x = 0,18 y = 0,61 z = 1,40 Result: ( ) 21,400,70,612,50,18 += in mm = 2,40 mm The equation )( szkyrx += is an abridged form of the equations resulting from the transformation of Equations (1) and (2) in DIN 6935:2011-10 for varying angular positions. For opening angles 0 90, they are as follows: skr += 218018022180180 and 90 180 skr + =2180tan218018022180tan2180180 25,1=srDIN 6935 Suppl. 1:2011-10 4 Figure 1 Graphical representation of factors