ProLigno / ProLigno 2009 Issue 2  
     
 
 
   
 

 


 

 

 

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.

REFERENCES
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WESTKAMPER, E.; KISSELBACH, A. (1995). Leistungssteigerung beim Bohren (Teil 2). HOB - Die Holzbearbeitung, 1995, 42, 6, pp. 69-75. ISSN 0018-3822.
HOFFMEISTER, H.-W.; LOOHß, T. (2006). Stanzen statt Bohren - Entwicklung eines alternativen Fertigungsverfahrens fur die industrielle Holzbearbeitung. HOB - Die Holzbearbeitung, 2006, 53, 5, pp. 80-84. ISSN 0018-3822.
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