Evaluating the Flange, Built-in Standards

• When a folded flange is evaluated, part of the outer contour is moved parallel to itself a certain distance (below denoted a).

• In the customer defined flange standard, the calculation of a is customer controlled.

• In the built-in standards, a is set using the following formula:

  a = H + k * R

  Here:

  • H is as given in input.

  • k is a factor (= 0.6).

  • R is the radius of the bending tool (current value 25).

  • Consequently, a = H + 15.

Suppose that the bending starts at the original geometry to which the flange is added, see the image below.

t is the material thickness.

As can be seen, the flange will add R+t to the extension of the panel if the assumption regarding the bending is correct.

The resulting height, Hb, after bending will be evaluated as follows (still with the assumption above).

The neutral line (not stretched during the bending) is supposed to be located at 1/3 of the material thickness from the inner surface.

Hb = H + k * R - PI * (R + t/3)/2 + R + t

= H + R * (1 + k - PI/2) + t * (1 - PI/6)

= (approximately) H + 6

(supposing R = 25, k = 0.6, t = 12)

Remark:

In type standard brackets with built-in flange standards, H is directly given when controlling the size of the flange (see Bracket Statement).