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Proceedings Paper

Laser-assisted micro sheet forming
Author(s): Jens Holtkamp; Arnold Gillner
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Paper Abstract

The fast growing market for micro technical products requires parts with increasing complexity. While sheet metal forming enables low cost mass production with short cycle times, it is limited by the maximum degree of deformation and the quality of the cut edge. The technology of warm forming partially eliminates these deficiencies. This operation takes place at elevated temperatures before structural transformation is initiated. It combines characteristic advantages of traditional cold and hot forming processes. Lasers as heat sources provide a high, selective and controllable energy input. The general difficulty of a uniform temperature distribution during the heating process can be reached by using an Axicon which generates an annulus on the sheet metal surface. The temperature of the workpiece, measured by a pyrometer, is tuned by a PI-Controller. A tool incorporating a multistage operation die is used for the manufacturing of up to three parts at the same time. The tool is integrated into a hydraulical press. A gearwheel made of the magnesium alloy AZ31 is chosen as metal demonstrator. The quality of these punched parts could be significantly improved at elevated temperatures

Paper Details

Date Published: 15 January 2008
PDF: 10 pages
Proc. SPIE 6985, Fundamentals of Laser Assisted Micro- and Nanotechnologies, 69850I (15 January 2008); doi: 10.1117/12.786985
Show Author Affiliations
Jens Holtkamp, Fraunhofer Institute for Laser Technology (Germany)
Arnold Gillner, Fraunhofer Institute for Laser Technology (Germany)

Published in SPIE Proceedings Vol. 6985:
Fundamentals of Laser Assisted Micro- and Nanotechnologies
Vadim P. Veiko, Editor(s)

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