Find the most up-to-date version of DIN EN at Engineering Buy DIN EN STEEL DIE FORGINGS – TOLERANCES ON DIMENSIONS – PART 1: DROP AND VERTICAL PRESS FORGINGS. Standard DIN EN Steel die forgings – Tolerances on dimensions – Part 1: Drop and vertical press forgings; German version EN.
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In the latter case the tolerances shall be indicated djn the appropriate dimension on the forging drawing. The tolerances specified apply to forgings not exceeding kg in mass or 2 sin maximum dimension. These are dimensions which would lead to over definition geometrically, or contradictions when given a tolerance. Tolerances for the maximum permissible extent of such distortion are based on the nominal diameter of the unforged stock in accordance with Table 6 and Figure In extreme cases they can cover the whole field of tolerances unless otherwise agreed between the supplier and the purchaser.
The permissible length of local deviation from the bar stock diameter or section adjoining a forged portion shall be up to 1,5 times the 10423-1 stock diameter or largest cross-sectional dimension, but with a maximum value of mm see Figure See also Figure Drop and vertical press forgingsrgees par estampage en acier es dimensionnelles Pieces executees a chaud sur x-pilons ou presses verticalesGesenkschmiedeteile aus Stahl MatoTeil 1: In such cases these standard tolerances can form only a basis on which to agree dinn appropriate to the particular circumstances.
Above 0,32 up to and including 0,63; S1: The location of burrs shall be indicated to the purchaser on the forging drawing for approval before the commencement of production. They shall be taken from Table 1 and Table 2.
The minus tolerances do not apply to edge radii up to and including 3 mm when such radii are affected by subsequent removal of draft by trimming or punching.
These two grades of tolerances are identified as follows: The cost of the forged part can be higher if grade E tolerances are selected, but the need for subsequent machining operations can often be reduced. All forgings bear the CDP identification mark, unless a different 1 Documents. See us on booth at NPE Documents.
The weight of the total length in question shall be calculated as if of unforged stock, irrespective of whether this is the case or not. They are best dealt with by consultation at the design stage and shall be agreed between the purchaser and the supplier. Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 34, an inside back cover and a back cover.
The centre-to-centre tolerances provided in this standard apply only when a straight line joining the two centres occurs within the profile of the forging see Figure The total tolerances permitted are shown in Table 3 and Table 4. For dimensions from a centre to a surface see Figure 9 and for dimensions on steps within one die, the tolerances for the greatest length, width and height shall apply wherever possible. All variations in thickness, due to die-closure, die-wear and shrinkage are included in the thickness tolerances.
Dimensional precision requirements are rigorous to the point that a choice may be made between forging grade F or forging grade E. Many instances of heavy die wear occur in which these tolerances are inadequate.
The BSI copyright notice displayed in this document indicates when the document was last issued. This European Standard does not apply to upset forgings made on horizontal sin machines see EN They apply within the limits stated below unless the purchaser specifies otherwise.
S3Type of steel used: Such special tolerances shall be agreed between the supplier and the purchaser before the commencement of production. By further movement to the right, the correct tolerance em found under the appropriate vertical column heading for the dimension concerned wherever possible the greatest dimension of length, width or height see 5.
If the category of steel used is M2, the heavy diagonal line is followed downward to the point of ne with the vertical line M2 and the horizontal line thus met is followed to the right i.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The enveloping shape of a circular forging is the circumscribing cylinder, the mass of which is calculated from the formula see Figure 2: Such requirements usually necessitate supplementary operations, e.
To avoid extra expense, it is essential that rn the dimensions be admitted into forging grade F.
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This should be done to obviate unnecessary minor variations between tolerances, thus facilitating drawing preparation and simplifying inspection procedures.
In measuring mismatch, een depends upon making due allowance for surplus metal caused by uneven die wear. They are classified into four groups; accordingly each of them is displayed in the table. In those instances where the variation is of importance e. Examples are shown of circular and non-circular forgings see Figure 2 and Figure 3.
This publication does not purport to include all the necessary provisions ddin a contract. From Table 1 eh tolerances see Figure 20 are found to be: Figure 16 Dimensions to which centre-to-centre tolerances are not applicable other than by negotiation Figure 17 Fillet and edge radii16 BSI 12 January Burr tolerances are applied independently of, and in addition to, any other tolerances.
In the case of a forging having a flange from which projects: In such cases, special tolerances shall be negotiated with the purchaser before the commencement of production. Where more restrictive tolerances are required for application to individual dimensions of thickness, supplementary operations are involved.
Example of the use of Table 1 Forging grade F for determining the tolerances for length, width, height dimensions of a forging. This approach will ensure that optimum use is made of the forging process in fulfilling the purchaser’s special requirements at the lowest additional cost.
The tolerances are determined from Table 3 and Table 4 in accordance with the greatest thickness dimension of the forging.
Reference dimensions included in the examples are given in brackets. VanDeusen Wisc B Documents. For that reason measurements should ddin made at areas of the forging least affected by die wear.