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Proceedings Paper

Novel measurement and monitoring system for forming processes based on piezoresistive thin film systems
Author(s): Saskia Biehl; Sebastian Staufenbiel; Frank Hauschild
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Paper Abstract

The investigation of a novel sensor system, integrated in the main load region of forming machines, is the challenge. Therefore it is important that the thin film system is multifunctional. It has an excellent tribological quality in combination with a piezoresistive behaviour. The layer system is deposited on the polished surface of a steel substrate. It has such geometries that it can be easily integrated in the drawing cushion of a deep drawing machine. The thin film sensor system exists out of a piezoresistive hydrogenated carbon layer, deposited in a PACVD process. Onto this layer arrays of chromium structures are deposited in a PVD process. The structures are protected against wear by an insulating silicon doped hydrogenated carbon layer. The whole thin film system has a thickness of about 9 μm. During the forming process the steel plate is in direct touch with the sensor system and moves over it. The position of the steel and the load distribution is measured in dependence on the forming stadium. The sensor system works as a control system to ensure that the shape of the product is perfect and without any cracks or creases.

Paper Details

Date Published: 18 May 2009
PDF: 5 pages
Proc. SPIE 7362, Smart Sensors, Actuators, and MEMS IV, 73621J (18 May 2009);
Show Author Affiliations
Saskia Biehl, Fraunhofer Institute for Surface Engineering and Thin Films (Germany)
Sebastian Staufenbiel, Fraunhofer Institute for Surface Engineering and Thin Films (Germany)
Frank Hauschild, Fraunhofer Institute for Surface Engineering and Thin Films (Germany)

Published in SPIE Proceedings Vol. 7362:
Smart Sensors, Actuators, and MEMS IV
Ulrich Schmid, Editor(s)

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