JP2018051571A - Winder and control method of steel plate tail end stop position - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a winder which can suppress the lowering of the stop accuracy of a steel plate tail end fixed position depending on a shape of a tail end of a steel plate, and a control method of a steel plate tail end stop position.SOLUTION: A winder 5 comprises a tail end stop position control part 13 which discriminates whether or not a pressing force detected by a pressing force detection part 12 is not larger than a prescribed value, when the pressing force is not larger than the prescribed value, determines that a tail end of a steel plate S has passed a wrapper roller 53a, and stops the tail end of the steel plate S at a prescribed position by stopping the rotation of a mandrel 52. The tail end stop position control part 13 calculates a first correction coefficient corresponding to a width of the tail end of the steel plate S, and corrects the prescribed value by using the calculated first correction coefficient.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a winding device that forms a coil by winding a steel plate and a method for controlling a steel plate tail end stop position.

  Generally, when a coil is formed by winding a steel sheet rolled in a hot rolling factory with a mandrel, the tail end of the steel sheet is used to suppress damage to the equipment and satisfy the coil transport conditions and the requirements of the next process. It is necessary to stop the rotation of the mandrel so that the part stops at a predetermined position. Specifically, it is necessary to stop the rotation of the mandrel so that the tail end portion of the steel plate stops at a predetermined position below the coil in order to facilitate handling of coil binding and conveyance. For this reason, in Patent Document 1, a certain amount of pressing force is applied to the outer peripheral surface of the steel sheet wound around the mandrel using the wrapper roll, and the pressing force applied by the wrapper roll decreases to a predetermined value or less. In such a case, a winding device that determines that the tail end portion of the steel sheet has passed the wrapper roll and stops the tail end portion of the steel sheet at a predetermined position has been proposed.

JP 2014-69195 A

  However, the inventors of the present invention apply a certain amount of pressing force to the steel plate as in the winding device described in Patent Document 1, and detect the tail end portion of the steel plate based on the variation of the pressing force. In this case, it was found that the tail end fixed position stop accuracy of the steel sheet is lowered according to the shape of the tail end part of the steel sheet. Specifically, when the shape of the tail end portion of the steel plate is a fishtail shape (the shape in which both end portions in the width direction protrude in the longitudinal direction), the shape of the tail end portion of the steel plate is a normal shape. The width of the tail end portion of the steel plate is reduced, and the contact area between the steel plate and the wrapper roll is reduced. As a result, because the amount of fluctuation in the pressing force when the tail end of the steel sheet passes through the wrapper roll does not decrease to a predetermined value or less, and the tail end of the steel sheet cannot be detected accurately, The precision at the tail end fixed position of the steel plate is lowered.

  The present invention has been made in view of the above-described problems, and the purpose thereof is a winding device and a steel plate tail capable of suppressing a decrease in the accuracy of stopping the tail end position of the steel plate due to the shape of the tail end portion of the steel plate. The object is to provide a method for controlling the end stop position.

  The winding device according to the present invention includes a mandrel that winds and rotates the tip of a steel sheet rolled by a finish rolling mill in a coil shape, and an outer peripheral surface of the coiled steel sheet wound around the mandrel. A wrapper roll for applying a pressing force, a pressing force detecting unit for detecting the pressing force applied to the outer peripheral surface of the coiled steel plate by the wrapper roll, and a pressing force detected by the pressing force detecting unit are predetermined. It is determined whether or not the value is equal to or less than the value, and when the pressing force is equal to or less than the predetermined value, it is determined that the tail end portion of the steel sheet has passed the wrapper roll, and the rotation of the mandrel is stopped to stop the mandrel. A tail end stop position control unit that stops the tail end of the steel plate at a predetermined position, and the tail end stop position control unit calculates a first correction coefficient according to the width of the tail end of the steel plate, Calculated first complement And correcting the predetermined value by multiplying the coefficients to said predetermined value.

  The winding device according to the present invention is the above-described invention, wherein the tail end stop position control unit has a shape of a tail end portion of the steel plate measured by a crop shape meter disposed on the entry side of the finishing mill. A crop cutting position of a crop cutting machine that is arranged on the entry side of the finishing mill and cuts the crop at the tail end of the steel sheet based on the shape of the tail end of the steel sheet measured by the crop shape meter. Based on the above, a first correction coefficient corresponding to the width of the tail end portion of the steel sheet is calculated.

  In the winding device according to the present invention, in the above invention, the tail end stop position control unit calculates a second correction coefficient according to a width of the coiled steel plate, and the first correction coefficient and the second correction coefficient are calculated. The predetermined value is corrected by multiplying the predetermined value by.

  The method of controlling the steel plate tail end stop position according to the present invention includes a mandrel that winds and rotates the tip of a steel plate rolled by a finish rolling mill to wind the steel plate in a coil shape, and a coiled shape wound around the mandrel. And a wrapper roll for applying a pressing force to the outer peripheral surface of the steel plate, and a method for controlling a steel plate tail end stop position in a winding device, wherein the wrapper roll applies to the outer peripheral surface of the coiled steel plate. A pressing force detecting step for detecting a force, and whether or not the pressing force detected in the pressing force detecting step is less than or equal to a predetermined value, and when the pressing force is less than or equal to the predetermined value, A tail end stop position control step for determining that the end has passed the wrapper roll and stopping the tail end of the steel sheet at a predetermined position by stopping the rotation of the mandrel. The tail end stop position control step includes a step of calculating a first correction coefficient corresponding to the width of the tail end portion of the steel sheet, and correcting the predetermined value using the calculated first correction coefficient. Features.

  The control method of the steel plate tail end stop position according to the present invention is the above invention, wherein the tail end stop position control step is the tail of the steel plate measured by a crop shape meter disposed on the entry side of the finishing mill. Crop cutting machine that cuts the crop at the tail end of the steel sheet based on the shape of the end and the shape of the tail end of the steel sheet that is arranged on the entry side of the finishing mill and measured by the crop shape meter The first correction coefficient corresponding to the width of the tail end portion of the steel sheet is calculated based on the crop cut position.

  In the control method of the steel plate tail end stop position according to the present invention, in the above invention, the tail end stop position control step calculates a second correction coefficient according to a width of the coiled steel sheet, and the first correction coefficient and And correcting the predetermined value by multiplying the predetermined value by the second correction coefficient.

  According to the winding device and the steel sheet tail end stop position control method according to the present invention, it is possible to suppress the tail end fixed position stop accuracy of the steel sheet from being lowered due to the shape of the tail end portion of the steel sheet.

FIG. 1 is a schematic diagram showing a configuration of a hot rolling line to which a winding device according to an embodiment of the present invention is applied. FIG. 2 is a flowchart showing the flow of tail end stop position control processing according to an embodiment of the present invention. FIG. 3 is a schematic diagram for explaining a predetermined value correction process according to an embodiment of the present invention.

  Hereinafter, a winding device and a method for controlling a steel plate tail end stop position according to an embodiment of the present invention will be described with reference to the drawings.

[Configuration of hot rolling line]
First, with reference to FIG. 1, the structure of the hot rolling line to which the winding apparatus which is one Embodiment of this invention is applied is demonstrated.

  FIG. 1 is a schematic diagram showing a configuration of a hot rolling line to which a winding device according to an embodiment of the present invention is applied. As shown in FIG. 1, a hot rolling line 1 to which a winding device according to an embodiment of the present invention is applied includes a rough rolling machine 2 that rolls a heated steel sheet S to a thickness of several tens of millimeters, A crop cutting machine 3 that cuts the front end and tail end crops of the steel sheet S rolled by the rolling mill 2 and finish rolling that rolls the steel sheet S from which the crop has been cut to a thickness of several millimeters. And a winding device 5 for winding the steel sheet S rolled by the finish rolling mill 4 into a coil shape.

[Configuration of winding device]
Next, with reference to FIG. 1, the structure of the winding device which is one Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the winding device 5 according to an embodiment of the present invention includes a pair of pinch rolls 51a and 51b, a mandrel 52, and wrapper rolls 53a, 53b, 53c, and 53d. The pair of pinch rolls 51a and 51b are configured to feed the steel sheet S to the mandrel 52 by rotating while sandwiching the upper and lower surfaces of the steel sheet S to suppress the flapping of the steel sheet S while applying an appropriate tension to the steel sheet S. is there. The mandrel 52 winds and rotates the steel sheet S in a coil shape by winding and rotating the tip of the steel sheet S fed from the pair of pinch rolls 51a and 51b. The wrapper rolls 53a to 53d guide the tip of the steel sheet S along the outer peripheral surface of the mandrel 52, press the steel sheet S against the mandrel 52, generate a frictional force, and wind the steel sheet S around the mandrel 52.

[Control system configuration]
Next, with reference to FIG. 1, the structure of the control system of the winding device which is one embodiment of the present invention will be described.

  As shown in FIG. 1, the control system of the winding device 5 according to one embodiment of the present invention includes a load sensor 11, a pressing force detection unit 12, and a tail end stop position control unit 13. The stock sensor 11 detects the presence or absence of the steel sheet S using laser light, gamma rays, or the like. The pressing force detection unit 12 is configured by, for example, a load cell. The pressing force detection unit 12 detects the pressing force of the wrapper roll 53 a and outputs an electrical signal indicating the detected pressing force to the tail end stop position control unit 13. The tail end stop position control unit 13 is configured by an information processing device such as a microcomputer, and controls the tail end stop position of the steel sheet S to a target position by executing tail end stop position control processing described later.

  In this embodiment, the tail end stop position control unit 13 is connected to a crop cut controller 14 that controls the crop cutting process by the crop cutting machine 3, and the image of the tail end of the steel sheet S and the crop cutting machine from the crop cut controller 14. Information about the crop cut position of 3 can be acquired. The image of the tail end portion of the steel sheet S is acquired by the crop shape meter 115 arranged on the entry side of the crop cutting machine 3 and input from the crop shape meter 15 to the crop cut controller 14.

  In the winding device 5 having such a configuration, the tail end stop position control process of the steel plate S is reduced due to the shape of the tail end portion of the steel plate S by the control system performing the tail end stop position control process shown below. To suppress. The operation of the control system when executing the tail end stop position control process will be described below with reference to the flowchart shown in FIG.

[Tail end stop position control process]
FIG. 2 is a flowchart showing the flow of tail end stop position control processing according to an embodiment of the present invention. The flowchart shown in FIG. 2 starts at the timing when the leading edge of the steel sheet S is detected by the stock sensor 11, and the tail end stop position control process proceeds to the process of step S1.

  In the process of step S1, the tail end stop position control unit 13 responds to the width of the tail end of the steel sheet S based on the shape of the tail end of the steel sheet S measured by the crop shape meter 15 and the crop cut position. The first correction coefficient is calculated, and the predetermined value is corrected by multiplying the calculated first correction coefficient by a predetermined value used in the process described later (predetermined value correction process). Details of the predetermined value correction processing will be described later. Thereby, the process of step S1 is completed and the tail end stop position control process proceeds to the process of step S2.

  In the process of step S <b> 2, the pressing force detection unit 12 measures the pressing force of the wrapper roll 53 a and outputs an electrical signal indicating the measured pressing force to the tail end stop position control unit 13. Thereby, the process of step S2 is completed, and the tail end stop position control process proceeds to the process of step S3.

  In the process of step S3, the tail end stop position control unit 13 reduces the pressing force of the wrapper roll 53a below the predetermined value corrected in the process of step S1, based on the electrical signal output from the pressing force detection unit 12. It is determined whether or not. As a result of the determination, when the pressing force of the wrapper roll 53a has not decreased below the predetermined value (step S3: No), the tail end stop position control unit 13 returns the tail end stop position control process to the process of step S2. On the other hand, when the pressing force of the wrapper roll 53a decreases to a predetermined value or less (step S3: Yes), the tail end stop position control unit 13 advances the tail end stop position control process to the process of step S4.

  In the process of step S4, the tail end stop position control unit 13 detects the position of the tail end of the steel sheet S based on the time when the pressing force of the wrapper roll 53a is reduced below a predetermined value and the rotation speed of the mandrel 3. To track. Thereby, the process of step S4 is completed, and the tail end stop position control process proceeds to the process of step S5.

  In the process of step S5, the tail end stop position control unit 13 stops the tail end of the steel sheet S at a predetermined target position based on the position of the tail end of the steel sheet S detected by the process of step S4. The rotation of the mandrel 52 is stopped. Thereby, the process of step S5 is completed and a series of tail end stop position control processes are complete | finished.

[Predetermined value correction processing]
Next, the predetermined value correction process in step S1 will be described with reference to FIG.

  FIG. 3 is a schematic diagram for explaining a predetermined value correction process according to an embodiment of the present invention. In general, as shown in FIGS. 3A to 3D, the shape of the tail end of the steel sheet S on the entry side of the crop cutting machine 3 is such that the center in the width direction extends longer in the rolling direction than the end in the width direction. It can be classified into a tongue shape and a fishtail shape in which the end portion in the width direction extends longer in the rolling direction than the central portion in the width direction. The shape and width of the tail end of the steel sheet S on the entry side of the winding device 5 are determined by the amount of elongation in the rolling direction and the crop cut position (Cs cut position) of the crop cutting machine 3.

  Therefore, in the predetermined value correction process according to an embodiment of the present invention, first, the entry side of the winding device 5 is based on the shape of the tail end portion of the steel sheet S measured by the crop shape meter 15 and the crop cut position. A first correction coefficient α corresponding to the width of the tail end of the steel sheet S is calculated. In the following, in order to simplify the description, the calculation process of the first correction coefficient α for the width of the tail end portion on one side (+ side) of the straight line A passing through the center position in the width direction of the steel sheet S will be described. Actually, the first correction coefficient α for the width of the tail end portion on the other side (− side) of the straight line A passing through the center position in the width direction of the steel sheet S is calculated in the same manner.

Specifically, as shown in FIG. 3A, when the shape of the tail end portion of the steel sheet S is a tongue shape and the amount of elongation in the rolling direction is small (the tongue shape is small), the width direction end portion of the steel sheet S is used. Since the positions a1 and a5 are on the crop cut position, the first correction coefficient α on the + side is calculated by the following formula (1). In FIG. 3A, points a2 ⁺ and a2 ⁻ indicate a cut position of a quarter of the steel sheet S, and a point a3 indicates a center cut position (reference point) of the steel sheet S.

α = Ya1 ÷ Ya1 (1)
Here, Ya1 indicates the length from the reference point a3 of the steel sheet S to the end position a1 in the width direction.

  On the other hand, as shown in FIG. 3B, when the shape of the tail end portion of the steel sheet S is a tongue shape and the elongation amount in the rolling direction is large (the tongue shape is large), the steel sheet S is at points an1 and am1. Since it touches the crop cut position, the width of the tail end portion of the steel sheet S relative to the length from the reference point a3 to the width direction end position a1 (the length from the reference point a3 to the point an1) according to the following formula (2) ) Is calculated as the first correction coefficient α on the + side.

α = Yan1 ÷ Ya1 (2)
Here, Yan1 indicates the length from the reference point a3 to the point an1, and Ya1 indicates the length from the reference point a3 to the width direction end position a1.

  Further, as shown in FIG. 3C, when the shape of the tail end portion of the steel plate S is a fishtail shape and the elongation in the rolling direction is small (small fish), the steel plate S has points an1, am1, Since it contacts the crop cut position at am2, the width of the tail end of the steel sheet S with respect to the length from the reference point a3 to the width direction end position a1 (from the reference point a3 to the point an1) by the following formula (3) Length) is calculated as the first correction coefficient α on the + side.

α = Yan1 ÷ Ya1 (3)
Here, Yan1 indicates the length from the reference point a3 to the point an1, and Ya1 indicates the length from the reference point a3 to the width direction end position a1.

  Further, as shown in FIG. 3D, when the shape of the tail end portion of the steel sheet S is a fishtail shape and the amount of elongation in the rolling direction is large (large fish), the steel sheet S has points an1, an2, Since it touches the crop cut position at am1, am2, the width of the tail end of the steel sheet S with respect to the length from the reference point a3 to the width direction end position a1 (from point an1 to point an2) The distance) is calculated as the first correction coefficient α on the + side.

α = (Yan1-Yan2) ÷ Ya1 (4)
Here, Yan1 represents the length from the reference point a3 to the point an1, Yan2 represents the length from the reference point a3 to the point an2, and Ya1 represents the length from the reference point a3 to the end position a1 in the width direction. Show.

  Then, the tail end stop position control unit 13 calculates the second correction coefficient γ according to the coil width using the following formula (5), and the first correction coefficient α on the + side and the first correction coefficient α on the − side are calculated. The predetermined value is corrected by multiplying the predetermined value by the sum of the first correction coefficient and the second correction coefficient γ.

γ = coil width ÷ average coil width × η (5)
Here, η represents a constant.

  As is clear from the above description, in the winding device 5 that is one embodiment of the present invention, the tail end stop position control unit 13 is the + side and the − side No. 1 according to the width of the tail end portion of the steel sheet S. 1 correction coefficient α is calculated, and the predetermined value is corrected by multiplying the predetermined value by the sum of the calculated first correction coefficient α on the + side and − side. According to such a configuration, the tail end portion of the steel plate can be accurately detected in consideration of the change in the amount of change in the pressing force accompanying the change in the width of the tail end portion of the steel plate. Can be suppressed.

  Moreover, in the winding device 5 which is one embodiment of the present invention, the tail end stop position control unit 13 calculates the second correction coefficient γ according to the width of the coiled steel plate, and the first correction coefficient on the + side. The predetermined value is corrected by multiplying the predetermined value by the sum of α and the negative first correction coefficient and the second correction coefficient γ. According to such a configuration, the tail end portion of the steel plate can be accurately detected in consideration of the change in the amount of change in the pressing force accompanying the change in the width of the coiled steel plate. It can suppress more that it falls.

DESCRIPTION OF SYMBOLS 1 Hot rolling line 2 Rough rolling mill 3 Crop cutting machine 4 Finish rolling mill 5 Winding device 11 Load sensor 12 Pushing force detection part 13 Tail end stop position control part 14 Crop cut controller 15 Crop shape meter 51a, 51b Pinch roll 52 Mandrel 53a, 53b, 53c, 53d Wrapper roll S Steel plate

Claims (6)

A mandrel that winds and rotates the tip of the steel sheet rolled by a finish rolling mill into a coil shape by winding and rotating;
A wrapper roll for applying a pressing force to the outer peripheral surface of a coiled steel sheet wound around the mandrel;
A pressing force detector for detecting the pressing force applied to the outer peripheral surface of the coiled steel sheet by the wrapper roll;
It is determined whether or not the pressing force detected by the pressing force detection unit is equal to or less than a predetermined value. When the pressing force is equal to or less than the predetermined value, the tail end portion of the steel sheet has passed through the wrapper roll. A tail end stop position control unit for determining and stopping the tail end of the steel sheet at a predetermined position by stopping the rotation of the mandrel,
The tail end stop position control unit calculates a first correction coefficient corresponding to the width of the tail end part of the steel plate, and corrects the predetermined value by multiplying the predetermined value by the calculated first correction coefficient. A winding device characterized by that.   The tail end stop position control unit is arranged on the entry side of the finishing mill, and the shape of the tail end of the steel sheet measured by a crop shape meter arranged on the entry side of the finishing mill, The width of the tail end of the steel sheet based on the crop cutting position of a crop cutting machine that cuts the crop at the tail end of the steel sheet based on the shape of the tail end of the steel sheet measured by a crop shape meter The winding device according to claim 1, wherein a first correction coefficient corresponding to the is calculated.   The tail end stop position control unit calculates a second correction coefficient according to the width of the coiled steel plate, and multiplies the predetermined value by multiplying the first correction coefficient and the second correction coefficient by the predetermined value. The winding device according to claim 1, wherein the winding device is corrected. A mandrel that winds and rotates the tip of a steel sheet rolled by a finish rolling mill in a coil shape, and a wrapper roll that applies a pressing force to the outer peripheral surface of the coiled steel sheet wound around the mandrel; A steel plate tail end stop position control method in a winding device comprising:
A pressing force detection step of detecting a pressing force applied to the outer peripheral surface of the coiled steel sheet by the wrapper roll;
It is determined whether or not the pressing force detected in the pressing force detection step is equal to or less than a predetermined value, and when the pressing force is equal to or less than the predetermined value, the tail end portion of the steel sheet has passed through the wrapper roll. Determining and stopping the rotation of the mandrel to stop the tail end of the steel sheet at a predetermined position, and a tail end stop position control step,
The tail end stop position control step includes a step of calculating a first correction coefficient according to a width of a tail end portion of the steel plate, and correcting the predetermined value using the calculated first correction coefficient. A control method of the steel plate tail end stop position.   The tail end stop position control step is arranged on the entry side of the finishing mill, and the shape of the tail end of the steel sheet measured by a crop shape meter arranged on the entry side of the finishing mill, The width of the tail end of the steel sheet based on the crop cutting position of a crop cutting machine that cuts the crop at the tail end of the steel sheet based on the shape of the tail end of the steel sheet measured by a crop shape meter The method according to claim 4, wherein a first correction coefficient according to the calculation is calculated.   The tail end stop position control step calculates the second correction coefficient according to the width of the coiled steel sheet and multiplies the predetermined value by multiplying the first correction coefficient and the second correction coefficient by the predetermined value. The method of controlling the steel plate tail end stop position according to claim 4 or 5, further comprising a step of correcting the error.

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