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Forming - Joggle Tonnage Calculation

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franklineng

Industrial
Joined
Nov 9, 2002
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36
Location
CA
Does anyone have an calculation to estimate the tonnage required to form a joggle or offset bend in sheet metal? Most texts will give an estimate between 3 - 6x the tonnage for air bending?
 
A good starting point is

Length of form (mm) X Material thickness (mm) X tensile strength (kg/mm2) X .4

This will give you an answer in kg.

If you start introducing any coining the value will soon shoot up.
 
Dear Sirs,
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