Abstract

In microsheet metal forming, the lengths of the contact zones between blank and die are important parameters to describe the contact behavior, but they can hardly be detected experimentally. Thus, a finite element simulation enables access to these zones and especially, their length. This length and its development during a metal forming process are analyzed in this work to establish its efficient measurement method. The part at the die called drawing edge is defined as a deformable body with material properties. Since every node of such a body can report pressure, the contact length is the product of the number of n – 1 nodes under contact pressure with the equidistant distance of lE = 1 μm between each node. It is shown, that with this method the direct determination of the contact zones position and length is enabled. Additionally, the simulative results show that the contact length is influenced by the geometrical conditions of the punch and die.

References

References
1.
Lutter
,
T.
,
Meinecke
,
C.
, and
Tropf
,
T.
,
2018
, “
Tragbar Und Vernetzt—Wearables
,”
Zukunft Der Consumer Technology—2017
, Bitcom e.V., Berlin, pp.
38
40
.
2.
Geiger
,
M.
,
Kleiner
,
M.
,
Eckstein
,
R.
,
Tiesler
,
N.
, and
Engel
,
U.
,
2001
, “
Microforming
,”
CIRP Ann. Manuf. Technol.
,
50
(
2
), pp.
445
462
.10.1016/S0007-8506(07)62991-6
3.
Vollertsen
,
F.
, and
Hu
,
Z.
,
2008
, “
Determination of Size-Dependent Friction Functions in Sheet Metal Forming With Respect to the Distribution of the Contact Pressure
,”
Prod. Eng. Res. Develop.
,
2
(
4
), pp.
345
350
.10.1007/s11740-008-0130-4
4.
Vollertsen
,
F.
,
Biermann
,
D.
,
Hansen
,
H. N.
,
Jawahir
,
I. S.
, and
Kuzman
,
K.
,
2009
, “
Size Effects in Manufacturing of Metallic Components
,”
CIRP Ann. Manuf. Technol.
,
58
(
2
), pp.
566
587
.10.1016/j.cirp.2009.09.002
5.
Doege
,
E.
,
Witthüser
,
K.-P.
, and.,
Grahnert
,
R.
,
1981
, “
Untersuchung Der Reibungsverhältnisse Beim Tiefziehen
,”
Tribologie—Reibung Verschleiß Schmierung
,
W.
Bunk
,
J.
Hansen
, and
M.
Geyer
, eds.,
Springer-Verlag
,
Berlin
, pp.
551
575
.
6.
Groche
,
P.
,
Filzek
,
J.
, and
Nitzsche
,
G.
,
2004
, “
Local Contact Conditions in Sheet Metal Forming and Their Simulation in Laboratory Test Methods
,”
Wissenschaftliche Gesellschaft Für Produktiontechnik (in Braunschweig)
,
XI/1
(
1
), pp.
55
60
.
7.
Groche
,
P.
, and
Nitzsche
,
G.
,
2006
, “
Reduction of Friction in Deep Drawing Aluminium Alloys by Generating Local Hydrostatic-Pressure Lubrication
,”
Proc. Inst. Mech. Eng., Part B: J. Eng. Manuf.
,
220
(
1
), pp.
43
48
.10.1243/095440505X32391
8.
Pereira
,
M. P.
,
Duncan
,
J. L.
,
Yan
,
W.
, and
Rolfe
,
B. F.
,
2009
, “
Contact Pressure Evolution at the Die Radius in Sheet Metal Stamping
,”
J. Mater. Process. Technol.
,
209
(
7
), pp.
3532
3541
.10.1016/j.jmatprotec.2008.08.010
9.
Hu
,
Z.
,
2009
, “
Analyse Des Tribologischen Größeneffektes Beim Blechumformen
,” Ph.D. dissertation, University of Bremen, Strahltechnik, 37, BIAS Verlag, Bremen, Germany.
10.
Schultze Niehoff
,
H.
,
2008
, “
Entwicklung Einer Hochdynamischen, Zweifachwirkenden Mikroumformpresse
,” Ph.D. dissertation, University of Bremen, Strahltechnik, 33, BIAS Verlag, Bremen, Germany.
11.
Thalau
,
J.
,
2011
, “
Ermittlung Der Reibfunktion Beim Mikrotiefziehen Mit Unterschiedlichen Geschwindigkeiten
,” Bachelor thesis, BIAS.
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