1、DEUTSCH E NORM Steel die forgings - Tolerances on dimensions Part 1: Drop and vertical press forgings English version of DIN EN 10243-1 June 2000 DIN EN 10243-1 ICS 17.040.10; 77.140.85 Gesenkschmiedeteile aus Stahl- MaBtoleranzen - Teil 1: Warm hergestellt in Hammern und Senkrecht-Pressen This stan
2、dard, together with DIN EN 10243-2, June 2000 edition, supersedes DIN 7526, January 1969 edition. European Standard EN 10243-1 : 1999 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been prepared by ECISSITC 28. The responsible German body
3、 involved in its preparation was the Normenausschuss Eisen und Stahl (Steel and Iron Standards Committee). Amendments DIN 7526, January 1969 edition, has been superseded by the specifications of EN 10243-1 and EN 10243-2. Previous edition DIN 7526: 1969-01. EN comprises 39 pages. No part of this sta
4、ndard may be reproduced without the prior permission of DINDeutsches Inslilul fOr Normung e. V., Berlin. Beulh Verlag GmbH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DIN-Normen). Ref. No. DIN EN 10243-1 : 2000-06 English price group 14 Sales No. 1114 10.00EUROPEAN
5、STANDARD NORME EUROPEENNE EUROpAISCHE NORM ICS 77.140.85 English version EN 10243-1 September 1999 Steel die forgings - Tolerances on dimensions Part 1: Drop and vertical press forgings Pieces forgees par estampage en acier - Tolerances dimensionnelles Partie 1: Pieces executees achaud sur marteaux-
6、pilons ou presses verticales Gesenkschmiedeteile aus Stahl MaBtoleranzen - Teil 1: Warm hergestellt in Hammern und Senkrecht-Pressen This European Standard was approved by CEN on 1999-08-22. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
7、giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national stand ards may be obtained on application to the Central Secretariat or to any CEN member. The European Standards exist in three official v
8、ersions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgiu
9、m, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for Standardization Comite Europeen de Normalisation Europaisches Komitee fUr Normung C
10、entral Secretariat: rue de Stassart 36, B-1050 Brussels 1999. CEN - All rights of exploitation in any form and by any means reserved worldwide for CEN national members. Ref. No. EN 10243-1 : 1999 EPage2 EN 10243-1 : 1999 Contents Foreword 2 1 Scope 3 2 Normative references 4 3 Symbols 4 4 Informatio
11、n required in determining tolerances 4 4.1 Mass of forging 5 4.2 Shape of die line 5 4.3 Category of steel used 5 4.4 Shape complexity factor 6 4.5 Types of dimension 8 5 Categories of tolerances. 8 5.1 Scope of categories 8 5.2 Definition of categories 10 5.3 Deviations of form 19 6 Use of tables 2
12、0 6.1 Tables 1 and 2: Tolerances for length, width and height, residual flash (and trimmed flat), and mismatch 20 6.2 Tables 3 and 4 : Tolerances for thickness and ejector marks 23 6.3 Table 5 : Tolerances for straightness, flatness and tolerances for centre-to-centre dimensions 23 6.4 Table 6: Tole
13、rances for fillet and edge radii; tolerances for burrs; tolerances for sheared ends 23 7 Design procedure 23 7.1 Information required by the forger 23 7.2 Preparation of forging drawing 24 7.3 Indication of dimensions on forging drawing 24 7.4 Indication of tolerances on forging drawings 24 7.5 Impo
14、rtance of forging drawing 24 Annex A (informative) Examples of application 30 Foreword This European Standard has been prepared by Technical Committee ECISSrrC 28 “Steel forgings“, the secretariat of which is held by asl. This European Standard shall be given the status of a national standard, eithe
15、r by publication of an identical text or by endorsement, at the latest by March 2000, and conflicting national standards shall be withdrawn at the latest by March 2000. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Associ
16、ation. This European Standard is considered to be a supporting standard to those application and product standards which in themselves support an essential safety requirement of a New Approach Directive and which make reference to this European Standard. According to the CEN/CENELEC Internal Regulat
17、ions, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the Uni
18、ted Kingdom.Page3 EN 10243-1 : 1999 1 Scope 1.1 This European Standard specifies the dimensional tolerances for steel drop and vertical press forgings made under hammers and presses. The first part of this European Standard applies to hot forgings in the delivery condition, made in carbon and alloy
19、steels. The tolerances specified apply to forgings not exceeding 250 kg in mass or 2500 mm maximum dimension. Tolerances for heavier or larger forgings shall be agreed at the time of enquiry and order. This European Standard does not apply to upset forgings made on horizontal forging machine (see pr
20、EN 10243-2). 1.2 The tolerances shown in this European Standard cover both forgings to normal requirements and forgings to a closer range of tolerances. These two grades of tolerances are identified as follows: - forging grade F with tolerances providing an adequate standard of accuracy for the majo
21、rity of applications and capable of being complied with by commonly used forging equipment and production methods ; - forging grade E providing closer tolerances to assist in acommodating those instances in which the normal manufacturing standards are inadequate. While grade E (close) tolerances may
22、 be applied to all dimensions on one forging, it is more economical to apply them only to those specific dimensions on which closer tolerances are essential. This grade should not be specified unless the additional forging cost entailed can be justified by a consequent saving in overall cost. The ta
23、bles showing dimensional tolerances are based on the R20 series of preferred numbers (see ISO 3). The annex A gives for information some examples of application of these tolerances for different types of closed die forgings. 1.3 Any occasional instances may necessitate the use of tolerances wider th
24、an those indicated, e.g. specially complicated designs and steels having particularly difficult forging characteristics. In such cases these standard tolerances can form only a basis on which to agreed modifications appropriate to the particular circumstances. 1.4 This European Standard does not inc
25、lude ranges of special tolerances closer than grade E. Such requirements usually necessitate supplementary operations, e. g. hot or cold coining or special processes such as warm or cold forging. Consideration of this nature, whilst frequently encountered, are highly individual, and vary widely. The
26、y are best dealt with by consultation at design stage and shall be agreed between the purchaser and the supplier. This approach will ensure that optimum use is made of the forging process in fulfilling the purchasers special requirements at the lowest additional cost.Page4 EN 10243-1 : 1999 2 Normat
27、ive references This European Standard incorporates by dated or undated reference, provisions from other pUblications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of a
28、ny of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS03 ISO 8015 3 Symbols Preffered numbers - Series of preferred numbers Technical drawings - Fundamental t
29、olerancing principle The symbols used along this European Standard are as follows: I = length dimension; b = width dimension; h = height dimension; a = thickness dimension; d = diameter; r = radius; p = step dimension; u = height of burr; v = width of burr; t = theoretical length ; e = special thick
30、ness across die line; m = mass (weight) ; Jl = circle factor; p = density ; S = shape complexity factor (see 4.4) ; M = category of steel (see 4.3) ; xandy = shearing deformation. 4 Information required in determining tolerances To determine the tolerances applicable to a given forging in accordance with tables 1 to 6, the following information is required in addition to the dimensions of the forging:
