Method for detecting pinholes in continuously cast billets

Details Method for detecting pinholes in continuously cast billets Method for detecting pinholes in continuously cast billets

1992-11-19

1994-11-15

Batten, Jr., J. Reed

Metal founding

Process

With measuring, testing, inspecting, or condition determination

1641501, 356237, B22D 1100, G01N 2189

Patent

active

053639014

ABSTRACT:
Continuously cast metal billets are continuously passed by a symmetric light source comprising a plurality of single light sources arranged in a circle or in another way such that the light falls substantially symmetrically on the part of the surface of the metal billet which is to be detected in such a way that the surface of the metal billet which faces the light source is illuminated except for pinholes. Reflected light from the surface of the billet is detected by a linescan camera arranged centrally in relation to the light source, which camera has a scanning direction normal to the direction of movement of the metal billet, whereby pinholes are detected by registration of reflected light intensity below a preset threshold value.

REFERENCES:
patent: 2758712 (1956-08-01), Linderman
patent: 3176306 (1965-03-01), Burns
patent: 3715476 (1973-02-01), Watanabe et al.
patent: 3781117 (1973-12-01), Laycak et al.
patent: 3795452 (1974-03-01), Bourdelais et al.
patent: 4028728 (1977-06-01), Sharp
patent: 4223346 (1980-09-01), Neiheisel et al.
Patent Abstracts of Japan, vol. 10, No. 334 (P-515) (2390) 13 Nov. 1986 & JP-A-61-139743 (Hitachi) 27 Jun. 1986.
Fairchild Camera and Instrument Corp., Model CCD1300 Line-Scan Camera Subsystem Instruction Manual, Section 7, 1977.

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