JP2001262236A - Method for controlling width of metallic steel strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling the width of a metallic strip of high precision and high response, by which the problems that, when changing the rolling reduction of a leveller in accordance with the shrinkage of a sheet width, a long time is taken till the sheet width reaches a tolerance, in the meanwhile, the defect of the sheet width is generated, and the yield is reduced. SOLUTION: In a sheet width control arithmetic unit 8, a roll winding angle and tension are calculated and are outputted to a roll winding angle controller 9 and a tension controller 10, respectively. As shown in the figure, a sheet winding angle variable roll 6 and a bridle roll 4 are respective final controlled systems.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for controlling the width of a metal steel strip in a continuous annealing facility.

[0002]

2. Description of the Related Art Conventionally, as a method of controlling the width of a metal steel strip, there is a method proposed in Japanese Patent Application Laid-Open No. 57-104631. That is, in a continuous heating furnace having a leveler in the furnace, according to the target value of the width of the strip steel sheet to be passed and the width reduction of the width detected from the actual width measured at the entrance or exit of the heating furnace. This is a method of changing the leveler reduction amount.

[0003]

In the conventional method, when changing the leveler reduction amount according to the plate width contraction amount,
In order to determine the leveler reduction amount empirically, if the sheet width tolerance deviates, manual intervention to the leveler reduction amount by trial and error is required, and it takes a long time to enter the tolerance, and during this time the sheet width defect Then, there is a problem that the yield decreases.

An object of the present invention is to solve the above problems and to provide a method of controlling the width of a metal steel strip with high accuracy and high response.

[0005]

According to a first aspect of the present invention, there is provided a continuous annealing facility, comprising a section having a plurality of rolls arranged side by side, wherein a metal steel strip and the rolls are provided. The width of the metal steel strip and the tension of the metal steel strip are changed.

Further, according to a second aspect of the present invention, there is provided a sheet winding method for changing the width of a section based on a difference between an actual measured value of a metal steel strip width and a target value of the metal steel strip width on an entrance side or an exit side of the section. The width control method of a metal steel strip according to claim 1, wherein the angle and the tension of the metal steel strip are calculated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an example of a continuous annealing facility and a method of controlling a width of a metal steel strip used in carrying out the present invention. In the figure, a strip steel plate 2 is passed through the annealing furnace 1 from right to left. The strip steel sheet 2 passes through a bridging roll 4 and a deflector roll 5 on the incoming side, vertically passes through six variable-angle winding rolls 6, and passes through the deflector roll 5 and the bridle roll 4 on the outgoing side.

[0008] The width of the strip steel plate 2 is measured by the input side width measuring device 3, and the measured value Wi is used as one of the input values of the comparator 7. In the figure, it is indicated by a dotted line. In addition, the sheet width measurement device has a sheet temperature correction function, and the measurement accuracy is ± 0.5 m.
It is desirable to use one that satisfies m or less.

As another input of the comparator 7, a target value Wr of the sheet width is set, and a difference ΔW between the previously measured value Wi and the target value Wr is calculated and output to the sheet width control arithmetic unit 8. I do.

[0010] In response to this, the sheet width control arithmetic unit 8 calculates the roll winding angle and the tension. Further, the calculation results are output to the roll winding angle control device 9 and the tension control device 10, respectively. As shown in the drawing, the plate winding angle variable roll 6 and the bridle roll 4 are the final control targets.

In the above description, an example of a predictive control system using the actual measured width Wi of the entry-side width measuring device 3 shown by a dotted line in the figure is shown. However, it is also possible to control the sheet width by using a feedback control method using the actual sheet width measured value Wo by the output side sheet width measuring device 3 shown by a solid line in the drawing.

Next, an example of a calculation method in the sheet width control calculation device 8 will be described. Based on the difference ΔW between the actually measured value and the target value, the winding angle Θ and the tensile stress σt are obtained from the following bending equation of the following equation (1) and equations (2) to (4).

[0013]

(Equation 1)

[0014]

(Equation 2)

[0015]

(Equation 3)

[0016]

(Equation 4)

[0017]

FIG. 2 shows an example of the relationship between the total winding angle of a roll and the width reduction. The conditions at this time are as follows: number of rolls = 6, plate thickness = 2.6 mm, plate width 120
0 mm, plate temperature = 600 ° C. From the figure, it can be seen that in order to secure the plate width control amount of 1.0 mm, a control range in which the tension is about 2 kg / mm 2 and the total roll winding angle is about 50 ° is necessary. When implementing the present invention in one pass section,
It is practical to use a maximum of about 10 rolls due to the limitation of the path length. Further, when the present invention is performed in a plurality of pass sections, a controllable amount of the sheet width in proportion to the increase in the number of passes, that is, the total roll winding angle can be obtained as compared with the case where the present invention is performed in a single pass section.

[0018]

As described above, according to the method for controlling the width of a metal steel strip of the present invention, a high-response and high-precision width control can be performed without requiring a large space as a width control zone. . As a result, it is effective in preventing the deviation from the plate width tolerance.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a continuous annealing facility and a method of controlling a width of a metal steel strip provided for carrying out the present invention.

FIG. 2 is a diagram illustrating an example of a relationship between a total winding angle of a roll and a width reduction amount.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Annealing furnace 2 ... Strip steel plate 3 ... Strip width measuring device 4 ... Bridle roll 5 ... Deflector roll 6 ... Strip winding angle variable roll 7 ... Comparator 8 ... Strip width control arithmetic unit 9 ... Roll winding angle control unit 10 ... Tension Control device Wi: actual measured value of the strip width by the entry width measuring device Wo: actual measured value of the strip thickness by the exit width measuring device Wr: target value of the strip width of the strip ΔW: actual measurement Value and target value Wr

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junji Koshiro 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Inventor Hiroshi Yoshimura 1-1-2 Marunouchi, Chiyoda-ku, Tokyo No. Nippon Kokan Co., Ltd. (72) Inventor Yukio Kimura 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Nippon Kokan Co., Ltd. (72) Inventor Takumi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Sun (72) Kazuo Yokoyama, Inventor 1-1-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 4K038 AA01 BA01 DA00 FA02 4K043 AA01 DA05 EA02 FA02 FA05

Claims (2)

[Claims] In a continuous annealing facility, a section having a plurality of rolls arranged side by side is provided to change a winding angle of a metal steel strip and the roll and a tension of the metal steel strip. Steel strip width control method. 2. A sheet winding angle and a tension of a metal steel strip to be changed based on a difference between an actual measured value of the metal steel strip width on an entrance side or an exit side of the section and a target value of the metal steel strip width. The method according to claim 1, wherein the calculation is performed.