1、October 2011 Translation by DIN-Sprachendienst.English price group 10No 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).IC
2、S 77.140.50!%(z“2050487www.din.deDDIN 6930-2Stamped steel parts Part 2: General tolerances,English translation of DIN 6930-2:2011-10Stanzteile aus Stahl Teil 2: Allgemeintoleranzen,Englische bersetzung von DIN 6930-2:2011-10Pices dcoupes et embouties en acier Partie 2: Tolrances gnrales,Traduction a
3、nglaise de DIN 6930-2:2011-10SupersedesDIN 6930-2:2010-01www.beuth.deDocument comprises 17 pagesIn case of doubt, the German-language original shall be considered authoritative.09.13 DIN 6930-2:2011-10 2 A comma is used as the decimal marker. Contents Page Foreword . 3 1 Scope . 4 2 Normative refere
4、nces . 4 3 General tolerances 4 3.1 General . 4 3.2 General tolerances for flat stampings 5 3.2.1 General . 5 3.2.2 General tolerances for linear dimensions of flat stampings 5 3.2.3 General tolerances for radii of curvature of flat stampings . 7 3.2.4 General tolerances for angular dimensions of fl
5、at stampings 7 3.2.5 General tolerances on coaxiality and symmetry of flat stampings . 8 3.3 General tolerances for stampings made by forming 9 3.3.1 General . 9 3.3.2 General tolerances for linear dimensions of stampings manufactured by forming 10 3.3.3 General tolerances for radii of curvature of
6、stampings manufactured by forming . 12 3.3.4 General tolerances for angular dimensions of stampings manufactured by forming 13 3.3.5 General tolerances on coaxiality and symmetry of stampings manufactured by forming . 13 4 Indication on drawings . 14 5 General tolerances on existing drawings 14 6 Sp
7、ecial cases 15 6.1 General . 15 6.2 Straightness tolerance for strip and sections . 15 6.3 Twisting of strip and sections . 15 Annex A (informative) Explanatory notes 17 DIN 6930-2:2011-10 3 Foreword This standard has been prepared by Working Committee NA 026-00-03 AA Stanzteile of the Normenausschu
8、ss Federn, Stanzteile und Blechformteile (NAFS) (Springs, Stamped Parts and Moulded Parts Standards Committee). For more information on NAFS, visit our website at www.nafs.din.de. Attention is drawn to the possibility that some elements of this document may be the subject of patent rights. DIN shall
9、 not be held responsible for identifying any or all such patent rights. DIN 6930 Stamped steel parts consists of: Part 1: Technical delivery conditions Part 2: General tolerances Amendments This standard differs from DIN 6930-2:2010-01 as follows: a) normative references have been updated; b) the ra
10、nge of nominal sizes has been extended; c) tolerances for thicknesses have been extended; d) general tolerances for angular dimensions of flat stampings have been extended; e) the standard has been editorially revised. Previous editions DIN 6930-3: 1971-10 DIN 6930-4: 1971-10 DIN 6934: 1959-08 DIN 6
11、936: 1955x-01, 1969-07 DIN 6937: 1955-01, 1968-10 DIN 6938: 1955-01, 1968-10 DIN 6939: 1955-01, 1968-10 DIN 6940: 1955x-01 DIN 6941: 1955-01, 1959x-07 DIN 6942: 1955-01, 1959-07 DIN 6943: 1955x-01 DIN 6944: 1955-01 DIN 6945: 1955-01 DIN 6946: 1961-07 DIN 6947: 1961-07 DIN 6948: 1961-07, 1968-10 DIN
12、6949: 1961-07, 1968-10 DIN 6930-2: 1972-04, 1983-01, 1989-04, 2010-01 DIN 6930-2:2011-10 4 1 Scope This standard is intended to simplify drawings. It specifies general tolerances on linear and angular dimensions, and on coaxiality and symmetry with four tolerance classes as follows: f (fine), m (med
13、ium), g (coarse) and sg (very coarse). By selecting a specific tolerance class, the customary workshop accuracy is taken into consideration. General tolerances as specified in this standard are used for cold or hot stampings made from flat steel products, and apply wherever reference is made to this
14、 standard in drawings or other relevant documents (e.g. delivery conditions). General tolerances for parts made by fine blanking (see VDI 2906 Part 5) are not covered by this standard. If, as an exception, this standard is also applied to parts made from semi-finished products other than flat produc
15、ts, or from materials other than steel, this shall be agreed separately. This standard is to be applied in conjunction with DIN 6932 on design rules for stamped steel parts. Technical delivery conditions for stampings are specified in DIN 6930-1. Guidelines for general tolerances indicated on existi
16、ng drawings are given in Clause 5. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments)
17、applies. DIN 6930-1, Stamped steel parts Part 1: Technical delivery conditions DIN 6930-3, Stamped steel parts Part 3: Shape-bent parts made from flat products Dimensions and tolerances DIN 6930-4, Stamped steel parts Part 4: Special parts for automotive vehicles Dimensions and tolerances DIN 6932,
18、Design rules for stamped steel parts DIN 6935, Cold bending of flat rolled steel DIN 8588, Manufacturing processes severing Classification, subdivision, terms and definitions DIN EN ISO 1101, Geometrical Product Specifications (GPS) Geometrical tolerancing Tolerances of form, orientation, location a
19、nd run-out VDI 2906 Part 5, Quality of cut faces of (sheet) metal parts after cutting, blanking, trimming or piercing Fine blanking 3 General tolerances 3.1 General The general tolerances specified in this standard take account of the particular aspects of stamping practice, including allowances for
20、 die wear. All dimensions (thicknesses and angles) refer to the nominal size and not to the real, subject-to-tolerances dimensions. In the case of blanked stampings, the tolerances apply to the cut band (see Figure 1). DIN 6930-2:2011-10 5 If smaller tolerances are required or larger tolerances are
21、permitted and are more economical, these shall be indicated separately. Key 1 Actual size: Length or diameter 5 Break band 2 Height of cut surface 6 Depth of burr 3 Drawn-in band 7 Thickness of workpiece 4 Cut band Figure 1 Determining actual size (notation) The position and size of the drawn-in ban
22、d, break band and burr may affect the performance of the stamping. In such cases, an agreement shall be reached between the manufacturer and the purchaser, details of which are to be entered in the drawing. In the case of stampings produced by nibbling (see DIN 8588) the actual size is the dimension
23、 measured over the peaks of the waved surface (see Figure 2). Key 1 Actual size Figure 2 Determining the actual size of stampings produced by nibbling (notation) The actual size of a stamping may possibly be influenced by the thickness tolerance of the flat product used. The fact that this thickness
24、 may alter during bending or deep drawing shall also be taken into consideration. 3.2 General tolerances for flat stampings 3.2.1 General Flat stampings shall only be made from flat products by cutting (using a shearing or blanking tool). Cutting methods are defined in DIN 8588. 3.2.2 General tolera
25、nces for linear dimensions of flat stampings The tolerances given in Table 1 apply to all linear dimensions including the diameters of flat stampings, except for the radii of curvature, which are specified in 3.2.3. In cases where dimensions are affected by flatness, the measuring methods and measur
26、ing points for flatness shall be subject to agreement between the manufacturer and the user. DIN 6930-2:2011-10 6 Table 1 Tolerances for linear dimensions of flat stampings (excluding radii of curvature) Dimensions in millimetres Nominal size range Class Tolerances for thicknesses up to 1 over 1 up
27、to 3 over 3 up to 6 over 6 up to 10 over 10 Up to 6 f 0,05 0,08 0,1 0,2 0,4 m 0,1 0,15 0,2 0,3 0,4 g 0,2 0,3 0,4 0,6 0,8 sg 0,5 0,5 0,8 1,2 1,5 Over 6 up to 10 f 0,08 0,1 0,15 0,2 0,4 m 0,15 0,2 0,25 0,4 0,4 g 0,3 0,4 0,5 0,8 0,8 sg 0,8 1 1 1,5 1,5 Over 10 up to 25 f 0,1 0,1 0,15 0,2 0,4 m 0,2 0,25
28、0,3 0,4 0,6 g 0,4 0,5 0,6 0,8 1 sg 1 1 1,5 1,5 2 Over 25 up to 63 f 0,1 0,15 0,2 0,3 0,4 m 0,25 0,3 0,4 0,5 0,6 g 0,5 0,6 0,8 1 1,2 sg 1 1 1,5 2 3 Over 63 up to 160 f 0,15 0,15 0,2 0,3 0,4 m 0,3 0,4 0,5 0,6 0,8 g 0,6 0,8 1 1,2 1,6 sg 1,5 1,5 2 3 3 Over 160 up to 400 f 0,2 0,3 0,3 0,4 0,5 m 0,5 0,6 0
29、,6 0,8 1,0 g 1 1,2 1,2 1,6 2 sg 1,5 2 2,5 3 3 Over 400 up to 1 000 f 0,4 0,4 0,5 0,5 0,8 m 0,8 0,8 1 1 1,5 g 1,6 1,6 2 2 3 sg 2,5 2,5 3 4 4 Over 1 000 up to 6 300 f 0,8 0,8 0,8 1 1 m 1,2 1,5 1,5 2 2 g 2,5 2,5 3 4 4 sg 4 4 4 4 4 DIN 6930-2:2011-10 7 3.2.3 General tolerances for radii of curvature of
30、flat stampings See Table 2. Table 2 General tolerances for radii of curvature Dimensions in millimetres Nominal size range Class Tolerances for thicknesses up to 1 over 1 up to 3 over 3 up to 6 over 6 up to 10 over 10 Up to 6 f, m, 0,2 0,3 0,5 g, sg 0,4 0,6 1,0 Over 6 up to 10 f, m, 0,3 0,4 0,5 0,6
31、g, sg 0,6 0,8 1,0 1,2 Over 10 up to 25 f, m, 0,4 0,5 0,6 0,8 1,0 g, sg 0,8 1,0 1,2 1,6 2,0 Over 25 up to 63 f, m, 0,5 0,6 0,8 1,0 1,2 g, sg 1,0 1,2 1,6 2,0 2,4 Over 63 up to 160 f, m, 0,8 1,0 1,2 1,4 1,6 g, sg 1,6 2,0 2,4 2,8 3,2 Over 160 up to 400 f, m, 1,0 1,2 1,5 1,8 2,0 g, sg 2,0 2,4 3,0 3,6 4,0
32、 Over 400 f, m, 1,6 2,0 2,2 2,5 3,0 g, sg 3,2 4,0 4,4 5,0 6,0 3.2.4 General tolerances for angular dimensions of flat stampings General tolerances for angular dimensions of flat stampings apply irrespective of the actual linear dimensions, i.e. the angular deviations are permitted for workpieces wit
33、h either maximum or minimum material sizes. The tolerances do not affect tolerances of form of the legs or faces enclosing an angle. Tolerances are specified in Table 3. DIN 6930-2:2011-10 8 Table 3 General tolerances for angular dimensions of flat stampings Dimensions in millimetres Class General t
34、olerances for a nominal size of the shorter leg, in angular units up to 6 over 6 up to 10 over 10 up to 25 over 25 up to 63 over 63 up to 160 over 160 up to 400 over 400 up to 1 000 over 1 000 up to 2 500 f 1 1 30 30 20 10 5 5 m 130 130 50 50 25 15 10 10 g, sg 3 3 2 2 1 30 20 20 3.2.5 General tolera
35、nces on coaxiality and symmetry of flat stampings 3.2.5.1 General DIN EN ISO 1101 gives explanations of the terms “coaxiality tolerance” and “symmetry tolerance” and specifies the corresponding indications on drawings. 3.2.5.2 Coaxiality The coaxiality tolerance applies to the nominal size of the la
36、rgest of the form elements under consideration. Thus the coaxiality tolerance is given by the difference between the upper and lower tolerances specified in Table 1 for the selected class and given product thickness. EXAMPLE Concentric arrangement of outer and inner contours of a pierced disc (see F
37、igure 3). Dimensions in millimetres aNominal size under consideration Figure 3 Nominal size to be considered for the coaxiality tolerance (notation) For a product thickness of 2 mm and a class m tolerance, the coaxiality tolerance is 0,8 mm according to Table 1. DIN 6930-2:2011-10 9 3.2.5.3 Symmetry
38、 The symmetry tolerance applies to the nominal size of the largest of the form elements under consideration. Thus the symmetry tolerance is given by the difference between the upper and lower tolerances specified in Table 1 for the selected class and given product thickness. EXAMPLE Symmetrical arra
39、ngement of two notches and a hole relative to the sides of a rectangular strip (see Figure 4). Dimensions in millimetres aNominal size under consideration Figure 4 Nominal size to be considered for the symmetry tolerance (notation) For a product thickness of 1 mm and a class g tolerance, the followi
40、ng symmetry tolerances are given in Table 1: Symmetry tolerance for hole axis in the longitudinal direction: 1,2 mm Symmetry tolerance for hole axis and mid-plane of notches in the transverse direction: 0,8 mm 3.3 General tolerances for stampings made by forming 3.3.1 General Stampings produced by f
41、orming are understood to be those which have undergone at least one forming operation (e.g. bending, deep drawing) and which are therefore not flat. In cases where dimensions are affected by flatness, the measuring methods and measuring points for flatness shall be subject to agreement between the m
42、anufacturer and the user. As a rule, stampings produced by forming also exhibit features produced by cutting. NOTE Stampings produced by forming may also feature flat (cut) form elements whose dimensional tolerances are not affected by the forming operation, e.g. because they are located at a suffic
43、ient distance from the formed workpiece or are manufactured after the forming operation. However, as it is not always possible for the designer to determine in advance when manufacturing will produce such results, such cases have not been dealt with here; instead, reference is to be made to the tole
44、rances for flat stampings. In cases where tolerances for particular form elements on stampings produced by forming are too large for the required function, suitable tolerances shall be specified individually. This may also apply to dimensions across elements manufactured by different processes (i.e.
45、 tolerances between an element produced by bending and one produced by cutting). DIN 6930-2:2011-10 10 3.3.2 General tolerances for linear dimensions of stampings manufactured by forming The tolerances specified in Table 4 apply to all linear dimensions, including the diameters of stampings manufact
46、ured by forming, except for the radii of curvature, which are specified separately. The nominal sizes to be considered may also have been produced either by cutting or a forming operation (see also Note to 3.3.1). Table 4 General tolerances for linear dimensions of stampings manufactured by forming
47、(excluding radii of curvature) Dimensions in millimetres Nominal size range Class General tolerances for thicknesses up to 1 over 1 up to 3 over 3 up to 6 over 6 up to 10 over 10 Up to 6 f 0,1 0,16 0,2 0,4 0,8 m 0,2 0,3 0,4 0,6 0,8 g 0,4 0,6 0,8 1,2 1,6 sg 1,0 1,0 1,6 2,0 3,0 Over 6 up to 10 f 0,16 0,2 0,3 0,4 0,8 m 0,3 0,4 0,5 0,8 0,8 g 0,6 0,8 1,2 1,6 1,6 sg 1,6 2,0 2 3 3 Over 10 up to 25 f 0,2 0,2 0,3 0,4 0,8 m 0,4 0,5 0,6 0,8 1,2 g 0,8 1,0 1,2 1,6 1,8 sg 2,0 2,0 3 3 4 Over 25 u
