1、DEUTSCH E NORM Steel die forgings - Tolerances on dimensions Part 2: Upset forgings made on horizontal forging machines English version of DIN EN 10243-2 June 2000 DIN EN 10243-2 ICS 17.040.10; 77.140.85 Gesenkschmiedeteile aus Stahl- MaBtoleranzen - Teil 2: Warm hergestellt in Waagerecht-Stauchmasc
2、hinen This standard, together with 01 N EN 10243-1, June 2000 edition, supersedes DIN 7526, January 1969 edition. European Standard EN 10243-2: 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 responsi
3、ble German body 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 Amendments DIN 7526, January 1969 edition, has been superseded by the specifications of EN 10243-1 and EN 10243-2.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 33 pages. No p
4、art of this standard 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 10243-2: 2000-06 English price group 12 Sales No. 1112
5、10.00EUROPEAN STANDARD NORME EUROPEENNE EUROpAISCHE NORM ICS 77.140.85 English version EN 10243-2 September 1999 Steel die forgings - Tolerances on dimensions Part 2: Upset forgings made on horizontal forging machines Pieces forgees par estampage en acier - Tolerances dimensionnelles Partie 2: Piece
6、s executees a chaud sur machines horizontales a forger Gesenkschmiedeteile aus Stahl MaBtoleranzen - Teil 2: Warm hergestellt in Waagerecht-Stauch maschinen This European Standard was approved by CEN on 1999-08-22. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipu
7、late the conditions for 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 e
8、xist in three official versions (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 b
9、odies of Austria, Belgium, 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 Europaisch
10、es Komitee fUr Normung Central 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 10243-2: 1999 EPage2 EN 10243-2 : 1999 Content Foreword 2 1 Scope 3 2 Normative references 3 3
11、Symbols 4 4 Definitions. 4 5 Information required in determining tolerances 6 5.1 Mass of upset portion 6 5.2 Category of steel used 6 5.3 Shape complexity factor 7 6 Categories of tolerances 8 6.1 Scope of categories 8 6.2 Definition of categories 9 6.3 Deviation of form 20 7 Use of tables 20 7.1 T
12、able 1 : Tolerances for diameter, length, residual flash (and trimmed flat), mismatch and eccentricity 20 7.2 Table 2: Tolerances for thickness 23 7.3 Table 3: Tolerances for straightness and flatness; tolerances for centre-to-centre dimensions 23 7.4 Table 4 : Tolerances for fillet and edge radii;
13、tolerances for die line fins, trimming burrs: tolerances for sheared ends 23 8 Design procedure 23 8.1 Information required by the forger 23 8.2 Preparation of forging drawing 23 8.3 Indication of dimensions on forging drawings 24 8.4 Indication of tolerances on forging drawings 24 8.5 Importance of
14、 forging drawing 24 Annex A (informative) Examples of application 28 Foreword This European Standard has been prepared by Technical Committee ECISSfTC 28 “Steel forgings“, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publ
15、ication 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 Association. Th
16、is 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 Regulations, the
17、 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 United Kingd
18、om.Page3 EN 10243-2 : 1999 1 Scope 1.1 This European Standard specifies the dimensional tolerances for steel upset forgings made on horizontal forging machines. The second part of this European Standard applies to hot upset forgings, in the delivery condition, made in carbon and alloy steels. The to
19、lerances specified apply to forgings not exceeding 250 kg in mass or 2500 mm maximum dimension. Tolerances for heavier or layer forgings are subjected to negociation. This European Standard does not apply to steel drop and press forgings (see prEN 10243-1). 1.2 For forgings produced in horizontal fo
20、rging machines forging grade F tolerances only are provided. This tolerance grade provides an adequate standard of accuracy for the majority of applications and is capable of being complied with by commonly used forging equipment and production methods. The tables showing dimensional tolerances are
21、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 than those indicated, e.g. specially compl
22、icated designs; steels having particularly difficult forging characteristics. In such cases these standard tolerances can form only a basis on which to agree modifications appropriate to the particular circumstances. 1.4 This European Standard does not include ranges of special tolerances closer tha
23、n grade F. Consideration of special tolerances whilst frequently encountered, are highly individual, and vary widely. They are best dealt with by consultation at the design stage and shall be agreed between the purchaser and the supplier. This approach will ensure that optimum use is made of the for
24、ging process in fulfilling the purchasers special requirements at the lowest additional cost. 2 Normative 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 t
25、he publications are listed hereafter. For dated references, subsequent amendments to or revisions of any 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. 1803
26、 ISO 8015 Preferred numbers - Series of preferred numbers Technical drawings - Fundamental tolerancing principlePage4 EN 10243-2 : 1999 3 Symbols The symbols used along this European Standard are as follows: / = length dimension; b = width dimension; h = height dimension; a = thickness dimension; d
27、= diameter; r = radius; p = step dimension ; u = height of burr; v = width of burr; t = theoretical length (of upset forgings) ; e = special thickness across die line; m = mass (weight) ; 7Z = circle factor; p = density (specific gravity) ; S = shape complexity factor (see 5.3) ; M = category of ste
28、el (see 5.2) ; x andy = shearing deformation. 4 Definitions For the purposes of this European Standard and specially for classification, the following definitions apply: 4.1 upset portion of a forging: An upset, or group of upsets, produced without the direction of presentation of the bar stock to t
29、he heading tool having been reversed endwise (see figure 1).Page 5 EN 10243-2 : 1999 Unforged bar stock Direction of heading tool to form upset portion Upset portion Figure 1 : An upset portion of a forging 4.2 double-ended upset forgings: Two separate upset portions which have been forged from oppo
30、site directions. In that case, the upset portion at each end shall be considered as an independent forging for the purpose of classification (see figure 2). Direction of heading tool to form “8“ Unforged bar stock B AEnveloping cylinder for calculation of shape complexity factor Direction of heading
31、 tool to form “A“ Figure 2 : A double-ended upset forging EXCEPTION: If such a forging has either no unforged stock (see 4.3) retained or its length does not exceed its diameter, the tolerances shall be applied as if the forging had been produced as a single upset portion.Page6 EN 10243-2 : 1999 4.3
32、 unforged stock: Any part of an upset forging which has been forged or formed prior to the upsetting operation (see figure 3). Effective dia for calculation of mass of “unforged“ stock upset portion Figure 3 : “Unforged“ stock 5 Information required in determining tolerances To determine the toleran
33、ces applicable to a given upset forging in accordance with table 1 to 4, the following information is required in addition to the dimensions of the forging: - mass of given upset portion(s) and mass of “unforged stock“ (if any) (see 4.3 and 5.1) ; - category of steel used; - shape complexity factor
34、for a given upset portion of a forging. 5.1 Mass of upset portion The mass of the upset portion is calculated. 5.2 Category of steel used The type of steel symbol used takes account of the fact that steels of high carbon and high alloy content are more difficult to deform and cause higher die wear t
35、han do steels with lower carbon content and lower alloying elements. The category of steel used is determined as being within one of the following: - group M1 : Steel with carbon content not more than 0,65 % and total of specified alloying elements (Mn, Ni, Cr, Mo, V, W) not more than 5 % by mass; - group M2 : Steel with carbon content above 0,65 % or total of specified alloying elements (Mn, Ni, Cr, Mo, V, W) above 5 % by mass. To determine the category in which a steel belongs the maximum permitted content of the elements in the steel specification shall be the values used.
