DIN 7526 Beiblatt:1971-05

Drop forgings produced in hammers and presses
1 General information relating to drop forgings produced
      in hammers and presses
      1.1 Scope
      1.2 Forging grades
      1.3 Special agreements
     Data for determining the tolerances of drop forgings
      produced in hammers and presses
      2.1 Weight of the drop forging
      2.2 Flash
      2.3 Interactability of material, steel grade
      2.4 Complexity of the drop forging
3 Tolerances for drop forgings made in hammers and
      presses
      3.1 Division into groups
      3.2 Explanations regarding tolerances
             3.2.1 First group (see Tables 1 and 2)
                      3.2.1.1 Tolerance for length, width
                                 and height dimensions
                      3.2.1.2 Permissible mismatch
                      3.2.1.3 Permissible residual flash
                                 (flash projection) and
                                 permissible depth of chamfer
                      3.2.1.4 Tolerance for hole dimensions
             3.2.2 Second group (see Tables 3 and 4)
                      3.2.2.1 Tolerances for thickness
                                 dimensions
                      3.2.2.2 Permissible height and depth
                                 of ejector marks
             3.2.3 Third group (see Table 5)
                      3.2.3.1 Permissible deflection and
                                 permissible distortion
                      3.2.3.2 Tolerances for centre
                                 distances
             3.2.4 Fourth group (see Table 6 and text)
                      3.2.4.1 Permissible variations for
                                 fillets and corner radii
                      3.2.4.2 Permissible height and width
                                 of trimming fins
                      3.2.4.3 Permissible depth of surface
                                 defects
                      3.2.4.4 Tolerances for the slope of
                                 surfaces
                      3.2.4.5 Permissible alignment error
                                 (position of axes of deep
                                 holes)
                      3.2.4.6 Tolerances for non-shaped
                                 part
                      3.2.4.7 Permissible deformation of
                                 sheared ends
4 Use of tables for determining the tolerances of drop
      forgings mode in hammers and presses
      4.1 Tables 1 and 2
      4.2 Tables 3 and 4
      4.3 Table 5
      4.4 Table 6
5 Guidelines for drawing for drop forgings produced in
      hammers and presses
      5.1 General
      5.2 Preparation of the forging drawings
      5.3 Indication of dimensions in the forging drawing
      5.4 Indication of permissible variations in the
             forging drawing
Drop forgings produced in horizontal forging machines
6 General information relating to forgings produced in
      horizontal forging machines
      6.1 Scope
      6.2 Special agreements
7 Terminology and its application to forgings produced in
      horizontal forging machines