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Simulation of a self-deburring drilling process based on local material modification

: Neugebauer, Reimund; Harzbecker, C.; Schmidt, G.; Dix, M.; Schönherr, J.

Preprint urn:nbn:de:0011-n-819361 (2.0 MByte PDF)
MD5 Fingerprint: d1ab94699dad61391e08256754a19468
Created on: 25.3.2011

National Institute of Standards and Technology -NIST-; International Institution for Production Engineering Research -CIRP-, Paris:
11th CIRP Conference on Modeling of Machining Operations 2008 : Sptember 16-18, 2008, Gaithersburg, MD, USA
Gaithersburg, 2008
Conference on Modeling of Machining Operations <11, 2008, Gaithersburg/Md.>
Conference Paper, Electronic Publication
Fraunhofer IWU ()
burr; drilling; FEM; FEA; burr avoiding; burr minimization

The formation of burrs at the end of a borehole is a general problem in metalworking and causes problems in assembly operations as well as the risk of injury during the handling of the parts. A new deburring approach which is used in this paper is the utilization of the plastic material flow during the burr formation itself to eliminate burrs. For that purpose the burr forming process is influenced by changing the material properties by well-defined local Laser-beam hardening of the workpiece material around the drill exit zone. The goal is to influence the plastic material flow in the manner that the burr cracks away during the break-through of the drilling tool. In this paper the effects of locally hardness distribution on the plastic flow of the material during the last state of the drilling process and the burr formation are analyzed by using experimental investigations and numerical simulations with the finite element analysis (FEA).