Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-03-03
1994-07-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250239, 250572, G01N 2189
Patent
active
053311787
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to an optical surface inspecting system for optically inspecting the surface condition of a rolling roll for rolling a steel plate or the like and, more particularly, to an optical surface inspecting system capable of taking a still picture of the surface (circumference) of a rolling roll during rolling operation to enable the observation and inspection of the surface condition of the rolling roll.
2. Background Art
When finishing a steel plate by hot rolling on a finishing mill, mill scales adhere to the surface of the work roll of the roughing stands of the hot finishing mill. The mill scales have minute hexagonal cracks. Under some rolling condition, the scales fall off the work roll and form circumferential bands of depressions, called "roll bandings" in the surface of the work roll as shown in FIG. 7. If the work roll having such roll bandings is used for rolling a steel plate, projections corresponding to the depressions of the work roll are formed in the surface of the steel plate, and the projections are crushed by the work roll of the other stands of the finishing mill to form scale pits in the steel plate.
Accordingly, the finishing mill is stopped at appropriate intervals, the work roll is removed from the finishing stand, the surface of the work roll is inspected visually and, if the surface is roughened by flaws, such as roll bandings, that will possibly form scale pits or if the surface is roughened to an extent that will form roll bandings, the work roll is replaced with another work roll.
A method of evaluating the surface roughness of a roll is proposed in Japanese Patent Laid-open (Kokai) No. 1-295108. This known method measures the distance between a predetermined position and the circumference of a roll by a ultrasonic distance meter, calculates radii of the roll at measuring points, determines the profile (the shape) of the roll, and evaluates the surface roughness of the roll from the profile.
The visual inspection of the surface of a roll requires the roll to be removed from the rolling mill and to be set in place on the rolling mill after inspection, which needs much time and labor. Moreover, if the rolling operation is interrupted for the inspection of the roll, the rolling mill needs to be kept at an idle for warming up the rolls before resuming the rolling operation, which reduces the productivity of the rolling mill. On the other hand, the method of evaluating the surface roughness of a roll from the profile of the roll has difficulty in accurately detecting minute roll bandings of a surface roughness Ra on the order of several microns.
The present invention has been made in view of the foregoing problems and it is therefore an object of the present invention to provide an optical surface inspecting system for inspecting the surface of a rolling roll, capable of taking a still picture of the surface of the rolling roll while the rolling roll is rotating even if the surface of the rolling roll is wetted with cooling water to cool the rolling roll properly, and of enabling the accurate inspection of the surface of the rolling roll through the observation and evaluation of the still picture of the surface of the rolling roll.
SUMMARY OF THE INVENTION
An optical surface inspecting system for inspecting the surface of a rolling roll in accordance with the present invention comprises: a housing box capable of moving in the direction of length of the rotating rolling roll being sprayed with cooling water or wetted with residual cooling water, and having a transparent window and a water removing mechanism for removing droplets of the cooling water from the outer surface of the window; a stroboscopic illuminating device contained in the housing box to illuminate the surface of the rolling roll through the window; a television camera contained in the housing box, operated in synchronism with the illuminating operation of the stroboscopic illuminating device to convert the surface of the rotating rolling roll into correspondi
REFERENCES:
patent: 4266142 (1981-05-01), Crawford
Azuma Makoto
Dejima Katsuro
Fukuda Makoto
Maeda Yukiyoshi
Yoshitake Kunihiko
Kabushiki Kaisha Kobe Seiko Sho
Lee John R.
Nelms David C.
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