JP2017113807A - Plate offset control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate offset control device.SOLUTION: A plate offset control device may include: a camber and width measurement part which measures a camber value and a width value of a rolling raw material; a plate offset measurement part which measures motion of the rolling raw material in a width direction; a roll gap level adjustment part which adjusts at least one roll gap level among plural finish rolling stands for rolling the rolling raw material; and a control part which controls the roll gap level adjustment part by selectively using information measured by the camber and width measurement part and the plate offset measurement part according to a position of the rolling raw material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a plate offset control device.

  In the hot rolling process, the slab supplied from the continuous casting machine in the steel making process is heated in a heating furnace at a hot rolling temperature, for example, 1100 to 1200 ° C., and is subjected to width rolling and thickness rolling in a rough rolling section to obtain a bar ( bar), rolled into a plate having a desired thickness in the finish rolling section, and then wound as a coil-shaped product in the winding section.

  When a phenomenon occurs in which the strip is shifted to one side in the hot rolling process, there arises a problem that the sheet feeding stability is lowered and the productivity is inferior. In the past, manual intervention by the operator, i.e., the operator visually identified the position of the plate and controlled the offset of the plate by manually changing the roll gap level of the rolling mill. Since it is extremely difficult to discriminate the deviation of the plate by the operator, there is a limit to suppressing the deviation of the plate.

Korean Published Patent No. 10-2013-0110492

  An object of the present invention is to solve the above-mentioned problems, and selectively uses the camber information and the plate piece offset information of the rolled material to be transferred to the finishing mill, It is in providing the board offset control apparatus which can suppress this.

  A plate offset control device according to an embodiment of the present invention includes a camber and a width measuring unit that measure a camber value and a width value of a rolled material, and a plate offset measuring unit that measures a movement in the width direction of the rolled material, According to the position of the roll material, a roll gap level adjusting unit that adjusts at least one roll gap level among m (m is a natural number of 3 or more) finishing rolling stands that roll the rolled material. And a control unit that controls the roll gap level adjusting unit by selectively using the information measured by the camber and width measuring unit and the plate offset measuring unit.

  A plate offset control device according to another embodiment of the present invention includes a camber and a width measuring unit for measuring a camber value and a width value of the rolling material transferred from a rough rolling mill, and a plurality of m pieces of finishing mills. Movement in the width direction of the rolling material transferred to the entry side of the finishing rolling stand arranged i (m> i ≧ 1, m is a natural number of 3 or more, i is a natural number) in the finishing rolling stand. A first plate deviation measuring unit for measuring the first roll gap level adjusting unit for adjusting the roll gap level of the i th finishing rolling stand, and j among the m finishing rolling stands. (M ≧ j> i ≧ 1, j is a natural number) a second plate offset measuring unit that measures the movement in the width direction of the rolling material transferred to the entry side of the finishing rolling stand that is arranged first; Finishing rolling star arranged at jth Select the information measured by the camber and width measuring unit and the first and second plate offset measuring units according to the position of the rolling material, the second roll gap level adjusting unit for adjusting the roll gap level of the roll And a control unit for controlling the roll gap level adjusting unit.

  According to one embodiment of the present invention, it is possible to stably suppress the deviation of the rolled material from the plate piece by selectively using the camber information and the piece piece information of the rolled material according to the transfer position of the rolled material.

It is a figure which shows an example of a hot rolling apparatus. It is a figure which shows the board offset control system by one Embodiment of this invention. It is a flowchart which shows the board offset control method by one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention can be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for a clearer description.

  FIG. 1 is a diagram showing an example of a hot rolling apparatus. Referring to FIG. 1, a hot rolling apparatus 1 includes a heating furnace 12 that heats a rolling material 11 such as a slab, a rough rolling machine 13 that roughly rolls the rolling material 11 heated in the heating furnace 12, A finish rolling machine 14 that finish-rolls the rolled material 11 roughly rolled into a form such as a bar, and a run-out table 15 (ROT: run) that transports the rolled material 11 finish-rolled into a form such as a strip. out table) and a winder 16 that winds the transferred rolled material 11 around a coil. The rolling material 11 passes through the heating furnace 12, the roughing mill 13, the finish rolling mill 14, the run-out table 15, and the winder 16 in order, and is wound on the coil.

  FIG. 2 is a diagram showing a plate offset control device 200 according to an embodiment of the present invention.

  The hot rolling apparatus shown in FIG. 2 includes a rough rolling stand 20 corresponding to the final stand of the rough rolling mill, and a plurality of finishing rolling stands 30-1 to 30-m (m is a natural number of 3 or more) provided in the finishing mill. Can be included.

  The plate deviation control device 200 may include a camber and width measurement unit 210, a first plate deviation measurement unit 220, a first roll gap level adjustment unit 230, and a control unit 240. A two-plate offset measuring unit 250 and a second roll gap level adjusting unit 260 may be further included.

  The camber and width measuring unit 210 can be disposed on the exit side of the rough rolling stand 20. The camber and width measuring unit 210 includes a plurality of cameras and can measure the camber value and the width value of the rolled material that has passed through the rough rolling stand 20.

  The camber and width measuring unit 210 can include a width measuring machine 211 that measures the width value of the rolled material 10. Moreover, the 1st camber measuring device 212 and the 2nd camber measuring device 213 which image | photograph the upper surface of the rolling raw material 10 from the upper part of the rolling raw material 10, and measure a camber value can be included. The first and second camber measuring machines 212 and 213 may be provided so as to cross each other diagonally with respect to the central portion of the rolled material 10 and to photograph both sides of the rolled material 10. The first and second camber measuring machines 212 and 213 can measure the camber value in the length direction of the rolled material by performing continuous shooting while the rolled material proceeds.

  Each of the width measuring device 211 and the first and second camber measuring devices 212 and 213 may include a camera. In FIG. 2, the camber and width measuring unit 210 is illustrated as including one width measuring device 211 and two camber measuring devices 212 and 213, but the present invention is not limited thereto. As an example, the camber and width measuring unit 210 includes a width measuring machine 211 including two cameras for measuring the width value of the rolled material, and a camber measuring machine including four cameras for measuring the camber value of the rolled material. 212, 213. In contrast, the camber value and width value of the rolled material can be measured by a plurality of cameras provided in the camber and width measuring unit 210.

  The first plate deviation measuring unit 220 can be disposed on the entrance side of one finishing rolling stand among the plurality of finishing rolling stands 30-1 to 30-m, and the first roll gap level adjusting unit 230 is The roll gap level of the one finishing rolling stand can be adjusted.

  The second plate offset measuring unit 250 can be disposed on the entry side of another finishing rolling stand among the plurality of finishing rolling stands 30-1 to 30-m, and the second roll gap level adjusting unit 260. Can be provided so that the roll gap level of the other finishing roll stand can be adjusted.

  The one finishing rolling stand can correspond to the finishing rolling stand arranged i-th among the plurality of finishing rolling stands 30-1 to 30-m, and the other one finishing rolling stand includes a plurality of finishing rolling stands. It is possible to correspond to the finishing rolling stand arranged at the j-th among the finishing rolling stands 30-1 to 30-m (m ≧ j> i ≧ 1, i, j are natural numbers). As an example, the finishing mill can be composed of a total of seven finishing rolling stands, and the finishing rolling stand arranged i-th of the finishing rolling mill can be the finishing rolling stand arranged first. , The finishing rolling stand arranged in the jth can be the finishing rolling stand arranged in the fifth.

  The first and second plate offset measuring units 220 and 250 are configured by a plurality of video measuring machines, and can measure the movement of the rolling material in the width direction when the rolling material 10 enters the finishing rolling stand. As an example, the image measuring device can be realized by a camera, and four image measuring devices can be provided.

  The control unit 240 includes a camber value and a width value in the length direction of the rolled material measured by the camber and width measuring unit 210, and a width of the rolled material measured by the first and second plate offset measuring units 220 and 250. The roll gap level value of the first and second roll gap level adjusting units 230 and 260 can be set using the movement in the direction.

  The control unit 240 according to the embodiment of the present invention changes the control setting values of the first and second roll gap level adjusting units 230 and 260 according to the transfer position of the rolling material.

  FIG. 3 is a flowchart showing a plate offset control method according to an embodiment of the present invention. Hereinafter, the control of the first and second roll gap level adjusting units 230 and 260 of the control unit 240 according to the transfer position of the rolling material 10 will be described in detail with reference to FIG.

  Initially, the control unit 240 may control the first roll gap level adjustment unit 230 using the camber value and the width value measured by the camber and width measurement unit 210 (S310). At this time, the above-mentioned initial stage is a case where the rolling material is positioned in the preceding stage of the k-th finishing rolling stand (before passing through the k-th finishing rolling stand) among the plurality of finishing rolling stands 30-1 to 30-m. (J> k> i, k is a natural number). As an example, the finishing rolling stand arranged at the kth may be the finishing rolling stand arranged at the third.

  The control unit 240 uses the camber value (Camber Deviation 1) and the width value (Camber Deviation 2) measured by the camber and width measurement unit 210, and the camber information (Stripe) of the rolled material that has passed through the camber and width measurement unit 210. Top Camber) is generated by the following equation 1. Α and β in Equation 1 correspond to weight values applied to the camber value (Camber Deviation 1) and the width value (Camber Deviation 2), respectively, in calculating the camber information.

  The control unit 240 controls the first roll gap level adjustment unit 230 using a control value determined from the calculated camber information (Stripping Top Chamber). A control value (Control Output) for controlling the first roll gap level adjusting unit 230 can be determined by the following Equation 2. G in Equation 2 means a control gain.

  Thereafter, the control unit 240 determines whether or not the rolling material has passed the k-th finishing rolling stand among the plurality of finishing rolling stands 30-1 to 30-m (S320). The one roll gap level adjusting unit 230 is controlled by the control value derived in step S310.

  In contrast, when the rolling material passes through the k-th finishing rolling stand among the plurality of finishing rolling stands 30-1 to 30-m, the control unit 240 is measured by the first plate offset measuring unit 220. The first roll gap level adjusting unit 230 can be controlled using the movement of the rolled material in the width direction (S330).

  Specifically, the control unit 240 generates plate offset information (e (t)) according to the following Equation 3 from the lateral movement value of the rolled material. Reference in the following formula 3 means a reference value.

  The control unit 240 controls the first roll gap level adjusting unit 230 using a control value determined from the calculated plate offset information (e (t)). A control value (Control Output) for controlling the first roll gap level adjusting unit 230 can be determined by the following Equation 4. Equation 4 shows a control method of a proportional-derivative controller, and Kp and Kd mean control gains.

  The level of the control gains Kp and Kd in the above equation 4 can be changed according to the transfer speed of the rolling material. As an example, when the transfer speed of the rolling material is increased, the levels of the control gains Kp and Kd can be increased. For example, when the steel plate speed is changed from 600 mpm to 1200 mpm, Kp can be changed from 5 to 10 and Kd can be changed from 3 to 12.

  Thereafter, the control unit 240 determines whether or not the rolling material has passed the j-th finishing rolling stand among the plurality of finishing rolling stands 30-1 to 30-m (S340). The one roll gap level adjusting unit 230 is controlled by the control value derived in step S330.

  In contrast, when the rolling material passes through the j-th finishing rolling stand among the plurality of finishing rolling stands 30-1 to 30-m, the control unit 240 is measured by the second plate offset measuring unit 250. The 2nd roll gap level adjustment part 260 can be controlled using the movement of the width direction of a rolling raw material (S350).

  Specifically, the control unit 240 generates plate piece offset information (e (t)) by the following Equation 5 from the lateral movement value of the rolling material.

  The control unit 240 controls the second roll gap level adjustment unit 260 using a control value determined from the calculated plate offset information (e (t)). A control value (Control Output) for controlling the second roll gap level adjusting unit 260 may be determined by the following Equation 6. Equation 6 shows a control method of a proportional-derivative controller, and Kp and Kd mean control gains.

  The level of the control gains Kp and Kd in the above equation 6 can be changed according to the transfer speed of the rolling material. As an example, when the transfer speed of the rolling material is increased, the levels of the control gains Kp and Kd can be increased. For example, when the steel plate speed is changed from 600 mpm to 1200 mpm, Kp can be changed from 3 to 10 and Kd can be changed from 3 to 12.

  As described above, according to one embodiment of the present invention, the input side camber and the output side camber of the reversible rolling mill are respectively obtained, and the reversible rolling mill is determined from the input side camber and the output side camber for each pass. By controlling the level amount, there is an effect that quick camber control and stable operation are possible.

  As mentioned above, although embodiment of this invention was described in detail, the scope of the present invention is not limited to this, and various correction and deformation | transformation are within the range which does not deviate from the technical idea of this invention described in the claim. It will be apparent to those having ordinary knowledge in the art.

200 Deviation control device 210 Camber and width measurement unit 220 First deviation measurement unit 230 First roll gap level adjustment unit 240 Control unit 250 Second deviation measurement unit 260 Second roll gap level adjustment unit

Claims (17)

A camber and width measuring unit for measuring the camber value and width value of the rolled material,
A plate offset measuring unit that measures the movement in the width direction of the rolled material,
A roll gap level adjusting unit for adjusting at least one roll gap level of m finishing roll stands (m is a natural number of 3 or more) for rolling the rolled material;
A plate piece including a control unit that controls the roll gap level adjustment unit by selectively using information measured by the camber and width measurement unit and the plate piece offset measurement unit according to the position of the rolling material. Shift control device. The controller is
The camber value measured by the camber and the width measuring unit in a section before the rolling material passes through the k-th finishing rolling stand among the m finishing rolling stands (m> k, k is a natural number). The plate shift control device according to claim 1, wherein the roll gap level adjusting unit is controlled using a width value. The controller is
The plate offset control apparatus according to claim 2, wherein camber information of the rolled material is calculated by the following formula using the camber value and the width value measured by the camber and width measuring unit.

(Camber Deviation 1: Camber Value, Camber Deviation 2: Width Value, Strip Top Camber: Camber Information, α and β: Weighted Values) The controller is
The board offset control device according to claim 3, wherein a control value for controlling the roll gap level adjusting unit is calculated by the following formula using the camber information.

(Control Output: control value, G: control gain) The controller is
The width direction measured by the plate offset measuring section in the section after the rolling material has passed through the k-th finishing rolling stand among the m finishing rolling stands (m> k, k is a natural number). The plate offset control device according to claim 1, wherein the roll gap level adjusting unit is controlled using a movement of the plate. The controller is
The board offset control apparatus of Claim 5 which calculates the board offset information of the said rolling raw material by a following formula using the movement of the width direction measured by the said board offset measuring part.

(E (t): plate offset information, lateral movement value: movement in the width direction, reference: reference value) The controller is
The board offset control apparatus of Claim 3 which calculates the control value for controlling the said roll gap level adjustment part by the following formula using the said board offset information.

(Control Output: control value, Kp and Kd: control gain) A camber and width measuring unit for measuring a camber value and a width value of a rolled material transferred from a roughing mill;
Transfer to the entrance side of the finishing rolling stand arranged i (m> i ≧ 1, m is a natural number of 3 or more, i is a natural number) among m finishing rolling stands of the finishing mill. A first plate offset measuring unit that measures the movement of the rolled material in the width direction;
A first roll gap level adjustment unit for adjusting a roll gap level of the finishing rolling stand arranged i-th,
The movement in the width direction of the rolling material transferred to the entry side of the finishing rolling stand arranged jth (m ≧ j> i ≧ 1, j is a natural number) among the m finishing rolling stands. A second plate offset measuring unit to be measured;
A second roll gap level adjusting unit for adjusting a roll gap level of the finishing rolling stand arranged at the j-th;
According to the position of the rolling material, the first and second roll gap level adjusting units are controlled by selectively using information measured by the camber and width measuring unit and the first and second plate offset measuring units. A board offset control device including a control unit. The controller is
The rolling material was measured by the camber and the width measuring unit in a section before passing through the k-th finishing rolling stand among the m finishing rolling stands (j>k> i, k is a natural number). The board offset control apparatus according to claim 8, wherein the first roll gap level adjustment unit is controlled using a camber value and a width value. The controller is
The sheet offset control device according to claim 9, wherein camber information of the rolled material is calculated by the following formula using the camber value and the width value measured by the camber and width measuring unit.

(Camber Deviation 1: Camber Value, Camber Deviation 2: Width Value, Strip Top Camber: Camber Information, α and β: Weighted Values) The controller is
The board offset control apparatus according to claim 10, wherein a control value for controlling the first roll gap level adjustment unit is calculated by the following formula using the camber information.

(Control Output: control value, G: control gain) The controller is
In the section after the rolling material has passed the kth finishing rolling stand among the m finishing rolling stands (j>k> i, k is a natural number), measured by the first plate offset measurement unit The board offset control device according to claim 8, wherein the first roll gap level adjusting unit is controlled using the movement in the width direction. The controller is
The plate offset control device according to claim 12, wherein the plate offset information of the rolled material is calculated by the following formula using the movement in the width direction measured by the first plate offset measuring unit.

(E (t): plate offset information, lateral movement value: movement in the width direction, reference: reference value) The controller is
The board offset control apparatus of Claim 13 which calculates the control value for controlling the said 1st roll gap level adjustment part by a following formula using the said board offset information.

(Control Output: control value, Kp and Kd: control gain) The controller is
In the section after the rolling material has passed through the j-th finishing rolling stand among the m finishing rolling stands, the second roll is measured using the movement in the width direction measured by the second plate offset measuring unit. The board offset control apparatus of Claim 8 which controls a gap level adjustment part. The controller is
The board offset control apparatus according to claim 15, wherein the board offset information of the rolled material is calculated by the following formula using the movement in the width direction measured by the second board offset measuring unit.

(E (t): plate offset information, lateral movement value: movement in the width direction, reference: reference value) The controller is
The board offset control device according to claim 16, wherein a control value for controlling the second roll gap level adjusting unit is calculated by the following formula using the board offset information.

(Control Output: control value, Kp and Kd: control gain)

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