B380EN03.DOC 5BMaximum output tables 3-49
5.2 Influencing factors
The maximum output tables are applicable to metallic materials. A
high level of strain hardening and hence an increase in the
required punching force should be taken into account in particular
when punching non-ferrous materials.
The values specified in the maximum output tables are
recommended values which are influenced among others by the
following factors:
• The sheet thickness can have tolerances of up to +18 %
upwards according to DIN EN 10131/10029/10051.
• The tensile strength can reach up to +12.5 %, in accordance
with DIN EN 10130.
• The reduction of the air gap between the punch and the die
from 10 % to 5 % of the sheet thickness increases the required
punching capacity by about 4 %.
• Lubrication of the workpiece reduces friction.
• The shear factor is influenced by the material properties.
• The sharpness of the punch.
• Damage and cutouts for the cutting edge of the punch.
Note
In practice, this means that if all the unfavorable factors are
multiplied with each other, then only approx. 70 % of the given
values should actually be applied.
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