App loading...
16
bending
16.6
U-bending with blankholder
203 Articles  2254 Elements

U-bending with blankholder

16.6
U-die bending with blankholder
Fig. 1
U-die bending21
lB Bending length εa Elongation of outer fiber FG Counterholding force FSt Punch force rM Die radius rSt Punch radius ub Bending gap s0 Sheet thickness

The counter-holding force FG prevents the base of the workpiece from bulging, which makes a subsequent straightening process unnecessary.

To calculate the punch force FSt max, the equations under U-die bending can be used. The blankholderforce must be added to the total punch force FSt tot.

Eqn. 1
\require{color}\definecolor{myred}{RGB}{255,0,0} F_{\color{myred}G}=0,3\dots0,5\cdot F_{\color{myred}St\;max}
Eqn. 2
\require{color}\definecolor{myred}{RGB}{255,0,0} F_{\color{myred}St\;max\;ges}=F_{\color{myred}St\;max}\;+\;F_{\color{myred}G}
21
Kluge, Siegfried / Prozesse der Blechumformung / Carl Hanser Verlag / München / 2020 / …
© 2023 4Ming e.K.
Kdia v1.3.1
4Ming® Prototypes, tools, die cushions, presses
Management consulting, process development & process optimization
Interactive Sheet Metal Forming Technical Guide