JP2013119091A - Sheet bar centering control method for rough rolling mill, and rough rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet bar centering control method for a rough rolling mill that can control centering of a sheet bar with simple configuration, and the rough rolling mill.SOLUTION: The rough rolling mill, configured to control the width direction centering of the sheet bar 4 when the sheet bar 4 is passed from edger mills 2a, 2b to a horizontal mill 1 to roll the sheet bar 4, includes current detectors 22a, 22b that detect meandering of the sheet bar 4 by obtaining the torque difference of respective driving motors for driving a pair of edger mills 2a, 2b provided on both sides of the sheet bar 4 in the width direction, and a control device 10 correcting the meandering of the sheet bar 4 by controlling the sheet bar width direction roll opening difference of the horizontal mill 1 according to the magnitude of the torque difference.

Description

  The present invention relates to a sheet bar centering control method and a roughing mill in a roughing mill that controls centering in the width direction of the sheetbar when the sheetbar is rolled from an edger mill to a horizontal mill. It is.

  In the continuous hot rolling process, continuously cast slabs are sequentially rolled using a roughing mill. If centering in the width direction of the sheet bar rolled by the roughing mill is not performed, meandering occurs in the rolled sheet bar, leading to product deterioration.

  For this reason, for example, in Patent Document 1, the off-center amount of the sheet bar that enters using a CCD camera or the like is measured in advance, and the mill center of the edger mill or the side guide center of the side guide is off-centered by this off-center amount. In this state, the seat bar is bitten into the coarse mill, and thereafter, the mill center of the edger mill or the side guide center of the side guide is centered.

JP-A-6-238314

  However, in the above-described patent document 1, it is necessary to provide a new device for detecting the off-center of the sheet bar, and there is a problem that the device configuration of the roughing mill becomes complicated.

  The present invention has been made in view of the above, and an object of the present invention is to provide a sheet bar centering control method and a roughing mill in a roughing mill that can control the centering of the sheetbar with a simple configuration. .

  In order to solve the above-described problems and achieve the object, the sheet bar centering control method in the roughing mill according to the present invention is performed when the sheet bar is rolled by passing the sheet bar from the edger mill to the horizontal mill. A sheet bar centering control method in a rough rolling mill for controlling centering in the width direction of a sheet bar, wherein a torque difference between drive motors for driving a pair of edger mills provided on both sides in the width direction of the sheet bar is obtained. A detection step for detecting the meandering of the seat bar, and a control step for correcting the meandering of the seat bar by controlling a roll opening difference in the width direction of the seat bar of the horizontal mill in accordance with the magnitude of the torque difference. It is characterized by including.

  The sheet bar centering control method in the rough rolling mill according to the present invention is characterized in that, in the above invention, the detection step detects a current value difference of each drive motor as the torque difference.

  Further, in the sheet bar centering control method in the rough rolling mill according to the present invention, in the above invention, the control step reduces the roll opening on the side opposite to the side where the torque of the drive motor is large, and / or Further, the present invention is characterized in that control is performed to increase the roll opening on the side where the torque of the drive motor is large.

  Further, the rough rolling mill according to the present invention is a rough rolling mill that controls centering in the width direction of the sheet bar when the sheet bar is rolled from an edger mill to a horizontal mill and rolled. A detector for detecting a meandering of the seat bar by obtaining a torque difference of each drive motor for driving a pair of edger mills provided on both sides in the width direction of the seat bar; and And a control device for correcting the meandering of the sheet bar by controlling a roll opening difference in the width direction of the sheet bar.

  According to the present invention, the meandering of the seat bar is detected by obtaining the torque difference between the drive motors that drive the pair of edger mills provided on both sides in the width direction of the seat bar, and according to the magnitude of the torque difference, Since the meandering of the sheet bar is corrected by controlling the roll opening difference in the widthwise direction of the horizontal bar of the horizontal mill, there is no need to provide a new device for detecting the off-center of the sheet bar. The centering of the seat bar can be controlled by the configuration, and the meandering of the seat bar caused by the horizontal mill can also be controlled to be corrected.

FIG. 1 is a schematic diagram showing a schematic configuration of a rough rolling mill according to an embodiment of the present invention. FIG. 2 is a flowchart showing a sheet bar centering control processing procedure by the control device shown in FIG. FIG. 3 is a diagram illustrating an example of a meandering state of the seat bar. FIG. 4 is a schematic diagram showing correction control contents of the horizontal mill corresponding to the meandering state of the seat bar.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic diagram showing a schematic configuration of a rough rolling mill according to an embodiment of the present invention. In FIG. 1, this rough rolling machine rolls a slab sent from, for example, a sizing press as a sheet bar, and a pair of side guides 3 a and 3 b provided in the width direction of the sheet bar 4 from the upstream side. A corresponding pair of edger mills 2a and 2b and a horizontal mill 1 are sequentially arranged.

  The pair of side guides 3a and 3b facing each other has an opening set wider than the width of the seat bar 4, for example, 30 to 50 mm wider, and guides the traveling seat bar 4 between the side guides 3a and 3b. The skew of the seed bar 4 is prevented.

  The pair of facing edger mills 2a and 2b induces rotation so that the seat bar center SC of the seat bar 4 guided by the side guides 3a and 3b coincides with the mill center MC of the edger mills 2a and 2b. The edger mill 2a is provided on the drive side, and the edger mill 2b is provided on the operation side. The edger mills 2a and 2b are driven by drive motors 21a and 21b, respectively. Here, the current detectors 22a and 22b detect current values corresponding to the torque values of the drive motors 21a and 21b, respectively, and output them to the control device 10.

  The horizontal mill 1 bites the sheet bar 4 guided by the edger mills 2a and 2b, adjusts the roll gap, and rolls the sheet bar 4 to a predetermined plate thickness. Here, the drive motor 11a adjusts the roll opening on the drive side under the drive control of the gap control unit 12a. Further, the drive motor 11b adjusts the roll opening on the operation side under the drive control of the gap control unit 12b. The gap controllers 12a and 12b drive and control the drive motors 11a and 11b according to instructions from the control device 10, respectively. Note that the edger mills 2a, 2b and the horizontal mill 1 are separated by about several meters.

  Here, the control device 10 detects the meandering state of the seat bar 4 based on the current values detected by the current detectors 22a and 22b, and sets the gap control units 12a and 12b so as to correct the meandering state. The roll opening degree is adjusted via this. That is, when a difference occurs in the torque applied to the edger mills 2a and 2b, it is determined that the seat bar 4 meanders, and the roll opening on the driving side and / or the operation side of the horizontal mill 1 is adjusted to The bar 4 is corrected and moved in the horizontal direction to correct the meandering.

  FIG. 2 is a flowchart showing a sheet bar centering control processing procedure by the control device 10 shown in FIG. As shown in FIG. 2, the control device 10 first obtains the difference between the current values of the drive motors 21a and 21b of the edger mills 2a and 2b (step S101). That is, the current value of the drive motor 21a that is the drive side current value and the current value of the drive motor 21b that is the operation side current value are acquired. Thereafter, it is determined whether or not the drive side current value is larger than the operation side current value (step S102). If the drive side current value is not larger than the operation side current value (No in step S202), it is further determined whether or not the operation side current value is larger than the drive side operation amount (step S103).

  When the drive-side current value is larger than the operation-side current value (step S102, Yes), the sheet bar center SC in the edger mills 2a and 2b is off-center from the mill center MC to the drive side, and the horizontal mill 1 The sheet bar center SC is off-center to the operation side with respect to the mill center MC. For this reason, when the drive-side current value is larger than the operation-side current value (step S102, Yes), the operation-side roll gap (roll opening) is determined according to the difference between the mill drive-side current value and the operation-side current value. Is sent to the gap control unit 12b, or an instruction to widen the roll gap on the drive side (roll opening) is sent to the gap control unit 12a to move the seat bar 4 in the horizontal mill 1 to the drive side. Correction control is performed (step S104), and the process proceeds to step S101.

  On the other hand, when the operation-side current value is larger than the drive-side current value (step S103, Yes), the sheet bar center SC in the edger mills 2a and 2b is in a state that is off-center from the mill center MC and is horizontal. In this state, the sheet bar center SC in the mill 1 is off-center to the drive side with respect to the mill center MC. For this reason, when the operation-side current value is larger than the drive-side current value (step S103, Yes), the drive-side roll gap (roll opening) is set according to the difference between the mill drive-side current value and the operation-side current value. To the gap control unit 12a or an instruction to widen the roll gap (roll opening degree) on the operation side to the gap control unit 12b to move the seat bar 4 in the horizontal mill 1 to the operation side. The correction control is performed (step S105), and the process proceeds to step S101.

  When the operation side current value is not larger than the drive side current value (No in step S103), the operation side current value is equal to the drive side current value, and the sheet bar center SC and the mill center MC match. Therefore, without performing the correction control, the process proceeds to step S101 as it is, and the above-described processing is repeated.

Here, with reference to FIG. 3 and FIG. 4, a specific sheet bar centering control process by the control device 10 will be described. FIG. 3 is a diagram illustrating an example of a meandering state of the seat bar.
FIG. 4 is a schematic diagram showing correction control contents of the horizontal mill corresponding to the meandering state of the seat bar. As shown in FIG. 3, the seat bar 4 enters in the direction A1, but the seat bar center SC of the seat bar 4 moves from the mill center MC to the driving side (direction A2 side), that is, the side guide 3a between the side guides 3a and 3b. When off-center, the torque applied to the edger mill 2a is larger than the torque applied to the edger mill 2b. That is, the current value of the drive motor 21a that drives the edger mill 2a is larger than the current value of the drive motor 21b that drives the edger mill 2b. In this case, the seat bar 4 engaged with the horizontal mill 1 is off-centered on the opposite side, that is, on the operation side (direction A3 side) by the moment force with respect to the off-center at the edger mills 2a and 2b.

  In this case, as shown in FIG. 4, the control device 10 reduces the roll gap Gb on the operation side and moves the sheet bar 4 to the driving side (direction A4 side), so that the sheet bar center SC coincides with the mill center MC. Perform correction control. Alternatively, the control device 10 increases the roll gap Ga on the drive side, moves the sheet bar 4 to the drive side (direction A4 side), and performs correction control by making the sheet bar center SC coincide with the mill center MC.

  The roll gap Gb on the operation side is reduced to move the sheet bar 4 to the drive side (direction A4 side), and the roll gap Ga on the drive side is increased to move the sheet bar 4 to the drive side (direction A4 side). The correction may be performed by moving the sheet bar center SC to coincide with the mill center MC.

  In this embodiment, the meandering of the seat bar 4 can be corrected only by detecting the current value difference between the drive motors 12a and 12b that drive the edger mills 2a and 2b. Furthermore, in this embodiment, not only meandering caused by the seat bar 4 itself entering the edger mills 2a, 2b but also meandering caused by the horizontal mill 1 can be detected by the difference in the current values of the drive motors 12a, 12b. In any case, the meandering of the sheet bar 4 can be corrected.

DESCRIPTION OF SYMBOLS 1 Horizontal mill 2a, 2b Edger mill 3a, 3b Side guide 4 Seat bar 10 Control apparatus 11a, 11b, 21a, 21b Drive motor 12a, 12b Gap control part 22a, 22b Current detector MC Mill center SC Sheet bar center Ga, Gb Roll gap

Claims (4)

A sheet bar centering control method in a roughing mill that controls centering in the width direction of the sheet bar when rolling the sheet bar from an edger mill to a horizontal mill,
A detection step of detecting a meandering of the seat bar by obtaining a torque difference between drive motors that drive a pair of edger mills provided on both sides in the width direction of the seat bar;
A control step of correcting the meandering of the sheet bar by controlling the roll opening difference in the width direction of the sheet bar of the horizontal mill according to the magnitude of the torque difference;
A sheet bar centering control method in a roughing mill characterized by comprising:   The sheet bar centering control method in the rough rolling mill according to claim 1, wherein the detecting step detects a current value difference of each drive motor as the torque difference.   In the control step, control is performed to reduce the roll opening on the side opposite to the side where the torque of the drive motor is large and / or increase the roll opening on the side where the torque of the drive motor is large. The sheet bar centering control method in the rough rolling mill according to claim 1 or 2. A roughing mill that controls centering in the width direction of the sheet bar when the sheet bar is rolled by passing the sheet bar from an edger mill to a horizontal mill,
A detector for detecting the meandering of the seat bar by determining the torque difference of each drive motor that drives a pair of edger mills provided on both sides in the width direction of the seat bar;
A control device for correcting the meandering of the seat bar by controlling the roll opening difference in the width direction of the seat bar of the horizontal mill according to the magnitude of the torque difference;
A rough rolling mill comprising:

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