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FAQ: How to Confirm Step-bend Angle and Die Width?
For press brake controllers without a radius bend or step-bend function each additional step from the starting point is one radius pitch value less than the previous step.
Determining the required sheet bending angle for each individual hit is a simple matter of dividing the number of degrees in the final metal bending angle by the number of step to be used:
Per sheet bending angle = Metal Bending angle A/Number of steps
Determining the correct V opening die width follows a different process than normally would be used. Under normal circumstances a V die is calculated at about eight times the sheet material thickness,relationship between the material thickness and inside radius is maintained. When selecting a lower V die for bumping radius bends, choose the value that is equal to twice that of the radius pitch.
Vee die width = Radius pitch x 2
If you have a lower V die width that is no greater than twice the radius pitch, the material that already has been bent will not rock into and out of the die space.
Consistency of bending angle over the full bending length is a concern. Normally beam middle location bending angle is bigger than 2 sides of bending machines, it must be corrected before the first pieces are run. While a nice bumped radius may be time-consuming to make on a part-to-part basis, the final result will more than justify the time, especially when compared to the cost of ordering a customized press brake tooling.
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