Bending help

Seitentitel - Linienknick

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There are two different ways of bending:

  • Air bending
  • Bottoming/coining

The force/pressure F for bottoming/coining is 3 up to 8 times higher than for air bending.

The die opening V should be 6 up to 12 times of the material thickness t. It also dictates the force/pressure F needed for air bending. For the choice of the opening V must be considered also the shortest flange b and the angle α. With a smaller die opening V the inside radius ri will be smaller.

With the below shown table of force and the formulas you can calculate the appropriate values. Alternatively you can use our calculator to determine the needed force.

Bending help: Table of force
Example: t = 2,0 mm
Optimum die opening V: 12 mm
Shortest flange b: 8,5 mm
Inside radius ri: 1,9 mm
Needed force/pressure F: 250 kN/m
Resistance
Aluminium Rm = 200 – 300 N/mm2
Mild steel Rm = 370 – 450 N/mm2
Stainless steel Rm = 650 – 700 N/mm2
Calculation of the optimum die opening V (in mm)
Material thickness t 0,5 – 2,5 3,0 – 8,0 9,0 – 10,0 12,0 and more
Die opening V 6 × t 8 × t 10 × t 12 × t
Calculation of the shortest flange b (in mm)
Angle α 165° 135° 120° 90° 60° 45° 30°
Flange b 0,51 × V 0,55 × V 0,58 × V 0,71 × V 1 × V 1,31 × V 1,94 × V
Calculation of the force/pressure F (in kN/m)
Calculation of the force/pressure F
Scaled, rusted or not oiled up sheet metal will cause a much higher force.
Calculation of the inside radius ri (in mm)
Calculation of the inside radius ri

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