Method and apparatus for automatically determining sheet metal s

Details Method and apparatus for automatically determining sheet metal s Method and apparatus for automatically determining sheet metal s

1979-11-28

1981-09-08

Wise, Edward J.

Boots, shoes, and leggings

364515, 3401463AC, G06K 936, G06F 1520

Patent

active

042888522

ABSTRACT:
Disclosed is a method and apparatus for automatic measurement of strain in a formed sheet metal sample. Prior to the forming operation, a grid of circles is imprinted on the sample and during the forming operation the circles are stretched to ellipses. The formed sample is exposed to an instrumentation camera and a digitized image of the pattern on the sample is stored in a digital computer. The computer is programmed to segment the image to distinguish the elliptical patterns from the background; to extract boundary points on an elliptical pattern and fit these points to an ellipse. Strain is determined as a function of the diameters of the fitted ellipse as well as the chord lengths of the actual pattern along the axes of the fitted ellipse.

REFERENCES:
patent: 3370492 (1968-02-01), Treff
patent: 3976827 (1976-08-01), Alien et al.
patent: 4041286 (1977-08-01), Sanford
patent: 4163212 (1979-07-01), Buerger et al.
patent: 4223387 (1980-09-01), Danielsson et al.
The Forming of Sheet Metal; S. S. Hecker & A. K. Ghosh, Scientific American, Nov. 1976, vol. 235, No. 5, pp. 100-108.

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