Schmelztauchveredeltes Feinblech.Hot-dip coated sheet.

Formability
A hot-dip coated sheet must not only be
resistant to corrosion, but also have
good forming properties. The investigation
of material characteristics for good
formability is thus a key research activity.
To assess formability the mechanical
properties are determined in tensile
tests and the forming limit curve is
established. On specially designed testing
machines, flat samples and structurally
similar samples can be tested
under cyclical loads and load graphs
can be established. The random fatigue
is studied in near-operational load
cycles.
Using components, the energy absorption
values of various steels is determined
on a crash test bed (drop weight
tear test bed). Measuring devices are
available to ascertain roughness, with
the possibility of realizing a threedimensional
diagram and measuring the
tribological behaviour of various sheet
surfaces.
In order to do justice to the complexity
of the drawing behaviour in the forming
process and to establish the material
influence on part behaviour with regard
to splitting, wrinkling formation and
elastic recovery, parts can be pressed in
the original size on a threefold-working
hydraulic punching and drawing press.
Using a hydromechanical forming process
(working medium water), an
attempt is made to utilize in a better
way the possibilities offered by high tensile
steels for light gauge design.
For the external hydroforming process
(AHU ® ) a 2,000 t press is available.
Structural components can be produced
from welded hollows using the internal
hydroforming process (IHU). Knowledge
about the dent characteristic of a component
is of great interest for the automobile
industry. This dent resistance is
determined on a company-developed,
computer-supported dent test bed,
which can be used to measure component
coordinates. Is it at all possible to
produce a certain component from a
certain material? Using the finite element
method (FEM), this question is
examined on a computer so that without
carrying out forming tests the first
answers can be given as to critical tool
areas or unsuitable materials.
Beulprüfstand zur Ermittlung der Beulfestigkeit
an großflächigen Außenhautteilen.
Dent test bed to determine dent resistance
of exposed parts.
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