RECOGNIZING METHOD OF SOUND PART CAPABLE OF CUTTING IN STEEL PLATE, ITS DEVICE, CUTTING METHOD OF SOUND PART, AND ITS DEVICE

摘要

PROBLEM TO BE SOLVED: To reduce a cutting margin as much as possible and to improve yield by subtracting the dimension of an end surface shape deformed part from the position coordinate of the whole periphery of the end surface and determining the sound part of a steel plate. SOLUTION: A laser beam 11a is irradiated toward the end surface 2a of the steel plate 2 to be cut, placed on a cutting place 1 off line with a projector 11. The locus of the laser beam 11a irradiated on the end surface 2a is caught with the light receiver 12 of a CCD camera. The shape of the locus of the laser beam 11a caught with the light receiver 12 is image processed with an operation judging device 14, and whereby the position coordinate of the whole periphery of the end surface and the end surface shape in the steel plate 2 are recognized. Like this, the sound part of the steel plate 2 is determined by subtracting the dimension of the end surface shape deformed part from the position coordinate of the whole periphery of the end surface using a judging device 15. The projector 11 and light receiver 12 are transferred with a transfer mechanism 13. By this way, both productivity and quality are improved.