Journal - Trumpf GmbH + Co. KG

Technology: Punching
A movable extra
The new machine option
“active die” is installed beneath
the worktable and
adjustable in height:
• scratch-free sheet
metal processing
• an active forming
stroke from below
• larger area reforming
with the use of new and
bigger forming tools
• simple programming
The active die is an option
that may be used with
the TruPunch 5000 (starting
from serial number
S06.00) and the TruMatic
7000 (starting from serial
number S02.00).
Michael Berger, technician
for Punching Tools,
explains what the active
die makes possible.
10 TruServices Journal 02|08
May we have a word with you, Mr. Berger?
Active die
The active die promises new dimensions in forming.
Is that promise justified?
Michael Berger: The die mount is movable and executes an active forming
stroke from below. That opens up possibilities that were hard to achieve in
the past. We can set out on entirely new paths in regard to the machining
strategy or tool concepts.
Which new solutions can you offer?
Berger: The active die enables larger and deeper forming. The fact that it
can be lowered opens up more space. What’s more, we can employ entirely
new tools in dimensions that were inconceivable in the past. We developed
one tool, for example, with an extrusion of 60 millimeters in diameter. In
other forming operations, as well, such as cups and bendings, we can capitalize
on these advantages.
Are there other changes in the tools?
Berger: The space we gained by lowering the die makes it possible to install
extras in the tool, such as more pressure springs. The extrusion tool, for
example, has been fitted with a completely new packet of pressure springs
and that’s the real attraction in that tool. What’s more, the extrusion distance
is greater than in previous models, making forming possible at
depths of up to ten millimeters. Thanks to the springs, the sheet metal
remains relatively flat during forming. Existing tools can also be used on
the new machines, fitted with the active die, without problems.
What benefits can users expect as well?
Berger: One major advantage is that the die makes scratch-free
punching and forming possible without requiring accessories
such as coated ejectors. The die can be lowered during
processing so that it does not touch the workpiece
at all. This also simplifies programming since the
die no longer represents a hindrance that has to
be “programmed around” when removing the
part. It also makes better utilization of material
possible and that saves costs.
How does that work?
Berger: Since the sheet metal is no longer
lifted by the tool but, instead lays flat
against the die, the customer can use the
forming tools closer to the holding clamps.
That reduces scrap and lowers material costs.
>> technik.tooling@de.trumpf.com