DIN 9830_Burr Heights on Stamped Parts

October 2011DIN 9830 D ICS 77.140.50 Supersedes DIN 9830:2010-01 Burr heights on stamped parts, English translation of DIN 9830:2011-10 Schnittgrathöhen an Stanzteilen, Englische Übersetzung von DIN 9830:2011-10 Hauteurs de la bavure des pièces découpées, Traduction anglaise de DIN 9830:2011-10 Normen-Download-Beuth-Steel Image Inc-KdNr.7923080-LfNr.7872778001-2017-02-28 08:43 Document comprises 6 pages Translation by DIN-Sprachendienst. In case of doubt, the German-language original shall be considered authoritative. © No part of this translation may be reproduced without prior permission of DIN Deutsches Institut für Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DIN-Normen). English price group 5 www.din.de !%(f[" www.beuth.de 09.13 2056756 Contents Page Foreword ......... 4 4 Formation of burrs ........................7872778001-2017-02-28 08:43 2 ..................................................................................................................... 4 3 Terms and definitions ...................................................................................................................... DIN 9830:2011-10 A comma is used as the decimal marker.............................7923080-LfNr......................................................................................................................................................................................................................................................................................................................................................... 4 2 Normative references ................................................................ 3 1 Scope .......... 6 Normen-Download-Beuth-Steel Image Inc-KdNr......................................................................... 4 5 Burr heights......... c) Figure 1 “Representation of the cut edge” has been included. b) Clause “Terms and definitions” has been included.din. Amendments This standard differs from DIN 9830:2010-01 as follows: a) Clause “Normative references” has been included. Previous editions DIN 9830: 1975-08.7923080-LfNr.de.nafs. Stanzteile und Blechformteile (NAFS) (Springs. d) Table 1 has been provided with a note. visit our website at www. DIN 9830:2011-10 Foreword This standard has been prepared by Working Committee NA 026-00-03 AA Stanzteile of the Normenausschuss Federn. Stamped Parts and Moulded Parts Standards Committee). 1988-01. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. 2010-01 Normen-Download-Beuth-Steel Image Inc-KdNr. For more information on NAFS. e) the standard has been editorially revised.7872778001-2017-02-28 08:43 3 . DIN shall not be held responsible for identifying any or all such patent rights. the latest edition of the referenced document (including any amendments) applies.  the tensile strength of the material being cut. Burr formation increases with:  increasing thickness.g.  decreasing tensile strength. 2 Normative references The following referenced documents are indispensable for the application of this document. projection of material. For undated references.  the condition of the tool. 3. DIN 2192. e. However. only the edition cited applies. the values given in Table 1 are not permissible burr heights in the sense of tolerances for stampings. forming during cutting.1 burr sharp-edged. The data in Table 1 cannot therefore be regarded as substantial information for delivery conditions of cutting tools.  the clearance between punch and die.7872778001-2017-02-28 08:43 generally requires the additional removal of the burr.  increasing tool wear. usually thin. Burr formation is mainly dependent on:  the thickness of the workpiece. where the flat surface of the workpiece in the immediate proximity of the burr serves as the reference surface 4 Formation of burrs Shearing is generally associated with the formation of a burr.7923080-LfNr. the following terms and definitions apply. which can be loosely or firmly attached to a cut edge NOTE This standard is concerned only with burrs forming due to shearing. by barrelling.2 burr height maximum height of a burr on a cut part.  increasing clearance between punch and die. Flat form springs — Quality requirements 3 Terms and definitions For the purposes of this document. nor are they intended as a criterion for classification of cutting tools into quality classes. DIN 9830:2011-10 1 Scope This standard is intended to provide manufacturers and users of stampings with an idea of the burr heights likely to be obtained. The manufacturing of burr-free stampings Normen-Download-Beuth-Steel Image Inc-KdNr. 4 . 3. For dated references. DIN 9830:2011-10 Figure 1 — Representation of the cut edge (notation) Key 1 Actual size: length or diameter 2 Height of cut surface 3 Drawn-in band 4 Cut band 5 Break band 6 Burr height h 7 Thickness of workpiece s Normen-Download-Beuth-Steel Image Inc-KdNr.7923080-LfNr.7872778001-2017-02-28 08:43 5 . 00 Burr height h µm From Up From Up From Up From Up From Up From Up From Up to From Up to over up to to to to to to to f 20 50 30 80 30 120 40 170 50 250 70 360 100 600 140 950 100 250 m 30 70 40 110 40 170 50 250 70 370 100 540 150 900 210 1420 g 40 100 50 150 60 230 70 340 100 500 140 720 200 1200 250 1900 f 20 40 20 50 30 90 30 120 50 180 60 250 80 360 110 500 250 400 m 20 50 30 70 40 130 40 180 70 260 90 370 120 540 170 750 g 30 70 40 100 50 170 60 240 90 350 120 500 170 730 230 1000 f 20 30 20 40 30 50 30 70 40 110 50 200 70 220 90 320 400 630 m 20 40 30 50 40 70 40 110 60 160 70 300 100 330 130 480 g 30 50 40 70 50 100 60 150 80 220 100 400 140 450 180 650 f 10 20 10 20 20 30 30 40 40 60 50 90 60 130 70 170 630 – m 10 20 20 30 30 40 40 60 50 90 70 130 80 190 100 260 g 20 30 30 40 40 50 60 80 70 120 90 180 110 260 130 350 For flat form springs. m medium.Manufacturing Workpiece thickness s strength precisiona mm of material Over 0. tensile Normen-Download-Beuth-Steel Image Inc-KdNr.30 up to 10. They are given as a function of workpiece thickness.40 up to 0.50 up to 4. 6 . for cut electrical metal sheets. tensile strength of the material being sheared and required manufacturing precision) a range is given for burr height. Wear of the tool is taken into account by the fact that for each case (thickness of workpiece.60 up to 2. g coarse 5 Burr heights The burr heights given in Table 1 are empirical values.g. these are to be agreed separately.63 Over 1.60 Over 2. DIN 9830:2011-10 Table 1 — Burr heights Tensile.00 Over 6.50 Over 4. etc. the precision of the machine tool and the tool. technological features. The higher values are to be expected with increasing tool wear.00 up to 6.63 up to 1.00 Over 1.00 up to 1.7872778001-2017-02-28 08:43 strength of the material being sheared and manufacturing precision. quality requirements as in DIN 2192 are to be taken into account. e.30 MPa Up to 0. a f fine.40 Over 0.7923080-LfNr. In cases where further requirements are specified for burr heights. The latter is influenced by such factors as the clearance between punch and die.