Kabushiki Kaisha Toshiba

Tokyo Shibaura Denki Kabushiki Kaisha

Kawasaki Steel Corporation

Yoshiharu Anbe

Tomoyuki Tezuka

Toshihiro Koyama

Nobuaki Nomura

Yoshimitsu Fukui

Hajime Kai

Yoshito Goto

Noriyasu Okitani

Takuo Funahashi

Takao Dobashi

Sumiyasu Kodama

Toshimi Mineura

Taichi Hatashita

A rolling mill is equipped with a work roll bending apparatus for controlling the strip crown of the strip. Upstream and downstream of the rolling mill are located strip crown meters which measure the thickness of the strip in the transverse direction. The variables of the work roll bending apparatus are manipulated, and determining the inheritance coefficient is determined on the basis of measurement values of the strip crown of the strip measured by the strip crown meters.

Apparatus for controlling a rolling mill based on a strip crown of a

The present invention includes the following constituent elements, namely:

Method and apparatus for the control of rolling mills

In the continuous rolling mills, the strip crown and the strip flatness of a strip can be controlled to any desired value. In the strip crown measuring method, the strip crown of the first stage rolling mill can be obtained by adding the set target strip crown value and a value obtained by multiplying the deviation in mechanical strip crown between the predicted value and the actually measured value by a imprinting ratio. Further, the strip crowns of the second and after rolling mills can be obtained by adding the set target strip crown, a value obtained by multiplying the deviation in mechanical strip crown between the predicted value and the actually measured value by a imprinting ratio, and a value obtained by multiplying the deviation in entry strip crown between the target value and the calculated measurement value by an inheritance coefficient, for each rolling mill. Further, in the control method of the continuous rolling mills, the rolling mill is controlled in correspondence to the deviation in strip crown between the value actually measured by the profile gauge and the previously calculated value, in such a way that the manipulated variables of the actuators of the rolling mills arranged on the upstream side of the rolling mill having the profile gauge are equal to each other or determined to a predetermined proportion by use of imprinting ratios and inheritance coefficients.

Strip crown measuring method and control method for continuous rolling

A rolled strip extending out of a rolling stand is pushed by a push roll to apply a tension to the strip. The flatness measuring surface of a flatness bar is moved above the pass line to measure flatness values at a plurality of points in the widthwise direction of the rolled strip, based on the applied tension. A rolling control apparatus includes an actuator pair disposed symmetrically with drive and work sides of the rolling stand, for adjusting the flatness of the rolled strip, a flatness measuring apparatus provided at the delivery side of the rolling stand for measuring flatness values at a plurality of points in the widthwise direction of the rolled strip immediately after the rolled strip extends out of the rolling stand, based on the flatness measuring method, and a flatness controller for controlling an actuator on the drive side so as to reduce a drive side flatness error calculated from measuring values obtained by the flatness measuring apparatus on the drive side as viewed from the center of the rolled strip, and controlling the other actuator on the work side so as to reduce a work side flatness error calculated from measured values on the work side.

Method and apparatus for measuring flatness and rolling control apparatus

According to this invention, a rolled sheet rolled by a reduction roll of a rolling mill is divided into a plurality of areas in a direction of its width, and sheet flatness or thickness values are measured in the plurality of areas. Bending forces, leveling value, shift amounts, and the like applied, by actuators respectively arranged at drive and work sides of the reduction roll, from the drive and work sides of the reduction roll are calculated in accordance with the sheet flatness or thickness measurement values and influence coefficients of the actuators. The actuators on the drive and work sides of the reduction roll are independently operated in accordance with these operation amounts.

Method and apparatus for controlling rolling mill

An apparatus for detecting a roll eccentricity in a rolling mill includes mark pulse generators each provided for upper and lower rolls from which an eccentricity is to be detected, the mark pulse generator generating one pulse per one rotation of the roll, sampling pulse generators each provided for the upper and lower rolls for generating n pulses per one rotation of the roll, and a rolling pressure detector for the rolls. After a mark pulse is generated, the rolling pressure signal outputted from the rolling pressure detector is first stored at the output timings of the sampling pulses. Next, a difference of the rolling pressure signals outputted from the rolling pressure detector is subjected to a Fourier transformation, the rolling pressure signals corresponding to those obtained after and before the relative phases of the upper and lower rolls are changed. The resultant values together with rotary angles and relative phases are used to output an eccentricity quantities independently for each roll.

Apparatus for detecting eccentricity of roll in rolling mill

In a method and a system for controlling an interstand tension in a continuous rolling mill having a looper provided between a pair of successive rolling stands and driven by a looper drive motor, a correction to the speed target value for the looper drive motor is determined in accordance with the deviation of a detected looper operating angle from an angle target value, and the looper drive motor is controlled in accordance with the speed of corrected speed target value.

Method and system for controlling an interstand tension in a continuous

The invention provides a method for controlling a continuous rolling mill having at least ith and (i+1)th stands and a control apparatus therefor, wherein an exit strip thickness reference value of an automatic gauge control is changed in accordance with a predetermined strip length during size changing and roll gap is corrected so as to change a strip thickness at an exit side of the ith stand, when a size (e.g., thickness) is changed during rolling, and, at the same time, a roll peripheral speed of the ith stand is changed in correspondence with a change in forward slip (a change in entry strip thickness, a change in exit strip thickness, and a change in resistance to deformation) of the ith stand as well as changes in forward slip, exit strip thickness, entry strip thickness and roll peripheral speed of the (i+1)th stand, so as to make the strip speed at the exit side of the ith stand coincide with that at the entry side of the (i+1)th stand, thereby minimizing the interstand tension and performing smooth size changing.

Method for controlling continuous rolling mill and control apparatus

Voltage, current, speed, and acceleration of each stand driving motor are detected and the rolling force of each stand is also detected. A processor unit is provided to determine the torque and the rolling force of the stands under no tension condition as well as under interstand tension condition for determining the interstand tension, and to determine a speed correction signal which is applied to a speed setter of the mill driving motor.

Control system of interstand tension of continuous rolling mills

There are provided operation apparatus and presetting apparatus for presetting a rolling program into the operation apparatus. In response to the preset value the operation apparatus computes the forward tension stress coefficient .gamma. and the rearward tension stress coefficient .delta. in accordance with the following equation

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Tokyo, Japan

Yoshiharu Anbe