In-die ejection force measurement in forming operations

Details In-die ejection force measurement in forming operations In-die ejection force measurement in forming operations

1997-10-17

1999-02-16

Noori, Max H.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified electrical sensor or system

73769, G01N 300

Patent

active

058723161

ABSTRACT:
The measurement of ejection tonnage in a die in forming process uses an embedded, in-die sensor and signal filtering methods for a more refined interpretation of the weaker signals associated with die vibrations. In particular, a self-tuning (adaptive) filter, matched to the embedded sensor, is used to reconstruct the stimulus of the die vibrations to reveal otherwise non-measurable knock-out tonnage parameters from the strain signal output by the sensor. Necessary information is obtained by means of a suitable dynamics identification procedure. Information necessary for self-tuning is obtained by means of a suitable die-set dynamics identification procedure.

REFERENCES:
patent: 3395564 (1968-08-01), Rastrelli et al.
patent: 4412456 (1983-11-01), Wilhelm et al.
patent: 4466477 (1984-08-01), Alofs
patent: 4484480 (1984-11-01), Mucheyer
patent: 5363899 (1994-11-01), Takagi et al.
patent: 5377548 (1995-01-01), Ballivy

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