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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Normally the tolerances for the greatest dimension of length or diameter of the forging will be applied but, if more restrictive tolerances are required, those for the specific dimension of the pierced hole may be used.
Base all thickness tolerances except those for overall thickness on dimension t shown above. In such cases these standard tolerances can form only a basis on which to agree modifications appropriate to the particular circumstances.
Centre-to-centre tolerances shall be applied independently of, and in addition to, any other tolerances. All forgings bear the CDP identification mark, unless a different 1 Documents. 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: Permissible tolerances based on the greatest dimensions are usually obtained from the appropriate table Maximum length: 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.
This grade should not be specified unless the additional forging cost entailed can be justified by a consequent saving in overall cost. They are best dealt with by consultation at the design stage and shall be agreed between the purchaser and the supplier. To determine the category in which a steel belongs, the maximum permitted content of the elements 102431 the steel specification shall be the values used.
These normative references are cited at the appropriate places in the text and the publications are listed hereafter. In extreme cases they can cover the whole field of tolerances unless otherwise agreed between the supplier and the purchaser.
The same method applies for the use of all tables according to the grade of tolerances required. Where more restrictive tolerances are required for application to individual dimensions of thickness, supplementary operations are involved.
Eccentricity tolerances for deep holes shall be applied in addition to the normal tolerances for mismatch see Figure These marks may be either sunken or raised. Also, the deviations of form do not include scale pits and depth of surface dressing see 5.
DIN EN 10243-1
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. Tolerances for sheared ends are applied independently of, and in addition to, any other don. For centre-to-centre dimensions greater than 1 mm length, tolerances from Table 1 or Table 2, with equal plus or minus dispersions, shall be applied.
These are dimensions which would lead to over definition geometrically, or contradictions when given a tolerance.
This should be done to obviate unnecessary minor variations between tolerances, thus facilitating drawing preparation and simplifying 10243- procedures.
Dimensional checks regarding depth of scale pits or any other point in question should be made in relation to the machining locations. In such cases the factor S4 is used; the weight to be taken into consideration is only that of a cylinder having diameter d and height e. By further movement to the right, the correct tolerance is 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 intersection with the vertical line M2 and the horizontal line thus met is followed to the right i. In measuring mismatch, accuracy depends upon making due allowance for surplus metal caused by uneven die wear.
All variations, including those due to die wear and shrinkage, are included in the length, width 102431 height tolerances. On forged surfaces which are not machined subsequently, scale pits and surface dressing shall be permitted to a depth equal to one-third of the total value of the thickness tolerance.
For undated references the latest edition of the publication referred to applies. In those instances where the variation is of importance e. The residual flash is measured from the body of the forging to the trimmed edge of the flash, as indicated in Figure This European Standard does not apply to upset forgings made on horizontal forging machines see EN Deviations of straightness or flatness as given in Table 5 are not included in the above-mentioned faults of form.
Annex A gives for information some examples of the application of these tolerances for different types of closed die forgings.
DIN EN – Free Download PDF
When no tolerance is indicated against the dimension concerned, the tolerance for the maximum length or width of the forging shall be applied from Table 1 or Table 2but the dispersion will be plus em minus one-half of e total tolerance, and not as shown in the tables.
Where restrictions in deviations of form have been agreed, these will be to ISO and eb on the drawing. All variations in thickness, due to die-closure, 01243-1 and shrinkage are included in the thickness tolerances. While grade E close tolerances may 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.
Many instances of heavy die wear occur in which these tolerances are inadequate. 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. Compliance with a British Standard does not of itself confer immunity from legal obligations. They are classified into four groups; accordingly each of them is displayed in the table.