Optical monitor for superplastic forming

Details Optical monitor for superplastic forming Optical monitor for superplastic forming

1988-12-19

1991-04-16

Combs, E. Michael

Metal deforming

With use of optical or transparent means

72 60, 72709, B21D 2602

Patent

active

050072650

ABSTRACT:
A monitor is provided for measuring and controlling the strain rate of a blank during forming. A light source directs light against the blank and a video camera is positioned and focused to view the light reflected from the blank while it is being formed. A video monitor and an image processor receive the signal from the camera. This signal is used to determine the strain rate based upon the dimensional change in reference marks on the blank. The image processor provides an output signal which can be used to control the strain rate in accordance with a predetermined strain rate profile for the particular part being formed.

REFERENCES:
patent: 4181000 (1980-01-01), Hamilton et al.
patent: 4233829 (1980-11-01), Hamilton et al.
patent: 4233831 (1980-11-01), Hamilton et al.
patent: 4489579 (1984-12-01), Daime et al.
patent: 4667095 (1987-05-01), Hatanaka et al.
patent: 4811582 (1989-03-01), Story et al.
Grid Circle Analyzer-Computer Aided Measurement of Deformation, Robert A. Ayres et al, Transactions of the Society of Automotive Engineers, 1979-vol. 88 (3), pp. 2630-2634.
MTS Systems Corporation, Minneapolis, Minn. 55424, An Optical Strain Sensor.

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