1、October 2011 Translation by DIN-Sprachendienst.English price group 5No part of this translation 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
2、 77.140.50!%(f“2056756www.din.deDDIN 9830Burr heights on stamped parts,English translation of DIN 9830:2011-10Schnittgrathhen an Stanzteilen,Englische bersetzung von DIN 9830:2011-10Hauteurs de la bavure des pices dcoupes,Traduction anglaise de DIN 9830:2011-10SupersedesDIN 9830:2010-01www.beuth.deD
3、ocument comprises 6 pagesIn case of doubt, the German-language original shall be considered authoritative.09.13 DIN 9830:2011-10 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope . 4 2 Normative references . 4 3 Terms and definitions 4 4 Formation of burrs 4 5 Burr heights
4、. 6 DIN 9830:2011-10 3 Foreword This standard 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, visit our website at www.n
5、afs.din.de. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN shall not be held responsible for identifying any or all such patent rights. Amendments This standard differs from DIN 9830:2010-01 as follows: a) Clause “Normative r
6、eferences” has been included; b) Clause “Terms and definitions” has been included; c) Figure 1 “Representation of the cut edge” has been included; d) Table 1 has been provided with a note; e) the standard has been editorially revised. Previous editions DIN 9830: 1975-08, 1988-01, 2010-01 DIN 9830:20
7、11-10 4 1 Scope This standard is intended to provide manufacturers and users of stampings with an idea of the burr heights likely to be obtained. However, the values given in Table 1 are not permissible burr heights in the sense of tolerances for stampings, nor are they intended as a criterion for c
8、lassification of cutting tools into quality classes. The data in Table 1 cannot therefore be regarded as substantial information for delivery conditions of cutting tools. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer
9、ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. DIN 2192, Flat form springs Quality requirements 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1
10、burr sharp-edged, usually thin, projection of material, forming during cutting, which can be loosely or firmly attached to a cut edge NOTE This standard is concerned only with burrs forming due to shearing. 3.2 burr height maximum height of a burr on a cut part, where the flat surface of the workpie
11、ce 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. The manufacturing of burr-free stampings generally requires the additional removal of the burr, e.g. by barrelling. Burr formation is mainly d
12、ependent on: the thickness of the workpiece; the tensile strength of the material being cut; the clearance between punch and die; the condition of the tool. Burr formation increases with: increasing thickness; decreasing tensile strength; increasing clearance between punch and die; increasing tool w
13、ear. DIN 9830:2011-10 5 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 DIN 9830:2011-10 6 Table 1 Burr heights Tensile-strength of material MPa Manufac
14、turing precisiona Workpiece thickness s mm Over 0,40 Over 0,63 Over 1,00 Over 1,60 Over 2,50 Over 4,00 Over 6,30 Up to 0.40 up to 0,63 up to 1,00 up to 1,60 up to 2,50 up to 4,00 up to 6,30 up to 10,00 Burr height h m over up to From Up to From Up to From Up to From Up to From Up to From Up to From
15、Up to From Up to 100 250 f 20 50 30 80 30 120 40 170 50 250 70 360 100 600 140 950 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 250 400 f 20 40 20 50 30 90 30 120 50 180 60 250 80 360 110 500 m 20 50 30 70 40 130 40 180
16、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 400 630 f 20 30 20 40 30 50 30 70 40 110 50 200 70 220 90 320 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 80 220 100 400 140 450 180 650 630 f 10 20 10 20 20 30 30 40 4
17、0 60 50 90 60 130 70 170 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, quality requirements as in DIN 2192 are to be taken into account. af fine, m medium, g coarse 5 Burr heights The burr heights given in Table 1
18、 are empirical values. They are given as a function of workpiece thickness, tensile strength of the material being sheared and manufacturing precision. The latter is influenced by such factors as the clearance between punch and die, the precision of the machine tool and the tool, technological featu
19、res, etc. Wear of the tool is taken into account by the fact that for each case (thickness of workpiece, tensile strength of the material being sheared and required manufacturing precision) a range is given for burr height. The higher values are to be expected with increasing tool wear. In cases where further requirements are specified for burr heights, e.g. for cut electrical metal sheets, these are to be agreed separately.
