PUNCHING OF BLIND HOLES IN WOOD MACHINING - AN ALTERNATIVE TO DRILLING
Hans-Werner HOFFMEISTER
Dr.eng. - Technische Universitat Braunschweig, Institute of Machine Tools and Production Technology
Address: Langer Kamp 19 B, 38106 Braunschweig, Germany
E-mail: H.Hoffmeister@tu-bs.de
Torsten LOOHß
Dipl.eng. - Technische Universitat Braunschweig, Institute of Machine Tools and Production Technology
Address: Langer Kamp 19 B, 38106 Braunschweig, Germany
E-mail: T.Loohss@tu-bs.de
Abstract: Nowadays
drilling is one of the most important production
processes in industrial wood machining. But this
process step limits the output of flow processing
machines because the workpieces have to be stopped
to create the drillings etc. at relatively low
feed speeds. The disadvantages of that conventional
technology shall be avoided through the development
of an alternative production process, by which
blind holes into wooden workpieces can be punched
with the use of a simple translational kinematics.
Especially for machining of fiber- and particle
board, which are typical materials in industrial
furniture production, very good results could
be achieved in the laboratory. Current research
activities also deal with the punching of solid
wood. A main field of investigation consists in
finding the connection between punching speed
(feed speed), punching force (process force) and
hole quality. The primary aim is to get minimum
forces at maximum qualities. Therefore several
experimental setups have been developed, which
enable punching with speeds of 0.001 m/s up to
150 m/s and thus different punching energies.
The test of different modified punching tools
was carried out with the same intention. The manufacturing
of alternative (noncircular) hole geometries for
fittings and assembly systems in furniture industry
is currently examined.
Key words: drilling, furniture
production, production process, punching, wood
machining.
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