Real-time draw-in sensors and methods of fabrication
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United States of America Patent
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Aug 3, 2004
Grant Date -
Dec 12, 2002
app pub date -
May 7, 2002
filing date -
May 7, 2001
priority date (Note) -
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Abstract
A method and system for providing real time measurements of draw-in for closed loop control of a metal forming process including an elongated sensor on one of the tools positioned in the proximity of the deformation zone and adjacent to an edge of a sheet metal blank being formed. The sensor includes coils disposed in a signal coupling relationship and during the forming process, a signal applied to one of the coils induces a signal in the coil, producing a response signal that varies linearly as a function of the amount of overlap between the sensor and the sheet metal blank as the sheet metal blank is drawn into the deformation zone. A feedback signal produced from the response signal is used to control a parameter of the forming process as a function of retreat of the edge of the sheet metal blank into the deformation zone.
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