PURPOSE: To grasp the state of both sections, a cutting section and its peripheral section, and enable accurate monitoring of cutting state by providing an inner face bead cutting section photographing device which receives regular reflection light of cut ray of light and an inner face bead cutting section peripheral section photographing device which receives diffuse reflection light.
CONSTITUTION: Slit light generated by a laser generator 7 is reflected by a mirror 8 and applied on an inner face bead cutting section. Regular reflection light (a) of cut ray of light which is formed in the inner face bead cutting section is reflected by a mirror 9 and received by an inner face bead cutting section photographing device 10. On the other hand, diffuse reflection light (b) of cut ray of light which is formed in an inner face bead cutting section peripheral section is reflected by a mirror 13 and received by an inner face bead cutting section peripheral section photographing device 14. Consequently, it is possible to display the state of the inner face bead cutting section peripheral section accurately on monitor screen sand monitor the cutting state accurately.
ODAKA JUNICHI
IWASAKI KENICHI
Next Patent: MONITOR DEVICE OF INNER FACE BEAD CUTTING STATE OF ELECTRO-RESISTANCE-WELDED TUBE