Drawing force second draw
5.3.1
The drawing force when second draw is calculated in a similar way to that for the predraw, but instead of β0 the current draw ratio βn is used. In addition, half the drawing force of the previous move is added.25
Eqn. 1
| Drawing Force to Continue | FZW | = | kN |
| Punch diameter | d2 | = | mm | |||
| Sheet thickness | s0 | = | mm | |||
| Average work hardening | kfm | = | MPa | |||
| Draw ratio | β1 | = | ||||
| Draw force predraw | FZ | = | kN |
Calc 1
Drawing force second draw25
25
Semmlinger, E.; Hellwig, W. / Spanlose Fertigung: Schneiden-Biegen-Ziehen / Vieweg Fachbücher / … / 1990 / 4. Auflage