Metal deforming – With use of control means energized in response to activator... – Metal deforming by use of roller or roller-like tool element
Reexamination Certificate
1999-07-20
2001-03-13
Tolan, Ed (Department: 3725)
Metal deforming
With use of control means energized in response to activator...
Metal deforming by use of roller or roller-like tool element
C072S011700
Reexamination Certificate
active
06199418
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the invention
This invention relates to a flatness control apparatus for a hot rolling mill which controls strip flatness.
2. Description of the Related Art
In a general flatness control apparatus for a hot rolling mill, manipulated actuator values for the rolling mill are determined based on flatness reference values and measured values of flatness meter equipped on the delivery side of the final stand. The position which measures strip flatness is defined the center of strip width as the center of line of rolling mill.
The flatness control apparatus is almost satisfactory when the center of the strip correspond with the center of line. However, in fact there is always no strip in the center of line. The strip is approached at the drive side, the side of the motor of rolling mill, or at the operator side, the side of monitoring room which supervises the rolled strip situation. In such a case, the position which strip flatness is measured by the flatness meter will be different from the actually measured position. It was difficult to control to flatness reference values and that is low accurate for controlling flatness.
SUMMARY OF THE INVENTION
The present invention is for solving above subject, and aims at providing flatness control apparatus for a hot rolling mill which is high accuracy and can control strip flatness when there is no strip in the center of line.
In accordance with the present invention, the foregoing objects, among others, are achieved by providing a flatness control apparatus for a hot rolling mill comprising a strip width meter, installed on an entry side of the hot rolling mill, for measuring center line error values of a strip; a flatness meter, installed on a delivery side of the hot rolling mill, for measuring flatness of the strip ;an actuator installed near the mill, for controlling flatness of the strip; a controller measures by the flatness meter based on center line error values measured and pre-set strip width values ; a controller determines deviations between measured flatness values and pre-set flatness reference values ;a controller determines correction actuator values based on the deviations ; and a controller determines manipulated actuator values based on the correction actuator values.
REFERENCES:
patent: 5126947 (1992-06-01), Koyama
patent: 5509285 (1996-04-01), Anbe
patent: 5740686 (1998-04-01), Martinetz
patent: 5960657 (1999-10-01), Anbe et al.
patent: 3-266007 (1991-11-01), None
patent: 6-71319 (1994-03-01), None
“Advanced Technology for Strip Rolling” (in Japanese), Corona Publishing Co. Ltd.; The Japan Society for Technology of Plasticity, 1993, pp. 182-183.
Kabushiki Kaisha Toshiba
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Tolan Ed
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