KR101673946B1 - Apparatus and method for reducing deviation of coil break in hot coil - Google Patents

Abstract

According to an embodiment of the present invention, a device for reducing the slack variation of a coil comprises: a strip provided on one side of a paper frill wound in a coil form to contact the strip in a wound state to press the paper frill; And a pressure roll which is movable from the oprile so as to move the moving path of the strip moving to the roll provided at one side of the phage prill to maintain a predetermined angle with the vertical direction, There is an advantage that the deviation of the fracture defect which is a defect of the shape can be reduced.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method and apparatus for reducing a slack variation in a coil,

More particularly, the present invention relates to a device for reducing a shedding deviation of a coil that can reduce deviation of a shedding defect, which is a shedding-type shedding that appears at right angles to the rolling direction of the surface of a coil, and Reduction method.

In general, the SKIN PASS MILL process is a device for improving the quality of a coil by rolling the strip STRIP by 1 to 4%. As shown in FIG. 1, Is fed to the work roll (30) through the feed roll (20), is roughly rolled, and then wound on a tension reel (40).

At this time, the pressure roll 20 can not keep the bending angle of the strip to be unwound from the coil constant even if the radius of the coil decreases when the coil mounted on the phage prill 10 is uncoiled. Therefore, there is a problem that the degree of occurrence of the roughness defect in the longitudinal direction of the coil is varied, and the surface quality of the coil can not be ensured.

Korean Patent Publication No. 10-2014-0081216 (Jul.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a device for reducing a variation in coil size and a method for reducing the variation in coiling of a coil.

According to an embodiment of the present invention, a device for reducing the slack variation of a coil comprises: a strip provided on one side of a paper frill wound in a coil form to contact the strip in a wound state to press the paper frill; And a pressure roll which is movable from the oprile to the roll installed on one side of the phage prill to move the moving path of the strip to a predetermined angle with the vertical direction.

The apparatus for reducing the sagging deviation of a coil includes a center shaft fixed to one side of the pressure roll and axially rotatable; A connecting frame having one end connected to the central axis and rotatable with the central axis; And a movable frame having one side connected to the other end of the connection frame and the pressure roll mounted on the other side and being movable along the connection frame.

The apparatus for reducing a sagging deviation of a coil includes: a rotation driving unit connected to the center shaft and capable of providing a rotational driving force to the center shaft; A linear driving unit connected to the moving frame and capable of providing a driving force to the moving frame so that the moving frame can be moved; And a control unit connected to the rotation driving unit and the linear driving unit and adapted to rotate the center line of the paper prill and the center of the pressure roll as the radius of the coil decreases, And a control unit for controlling the driving unit and the linear driving unit. At this time, theta can be determined by the following equation (1).

[Equation 1]

(Where R is the radius [m] of the coil and r is the radius [m] of the pressure roll)

The control unit calculates the center coordinates (Xc, Yc) at which the center of the pressure roll is to be positioned with respect to the center of the page prill by the following equation (2), wherein the center of the pressure roll is the center coordinates Xc , And Yc of the driving unit and the linear driving unit.

&Quot; (2) "

(Where [beta] is an angle [rad] formed by the moving path of the strip with the vertical direction)

According to another aspect of the present invention, there is provided a method for reducing a slack variation deviation of a coil, comprising the steps of: moving the strip, which is unwound from a phage prill mounted with a coil, to a roll installed on one side of the phage prill, And moving the pressure roll in contact with the strip to maintain the pressure roll.

Wherein the moving step comprises moving the pressure roll so that a center line between the center of the phage prill and the center of the pressure roll maintains an angle [theta] [rad] with respect to the moving path, Can be determined by Equation (1).

[Equation 1]

(Where R is the radius [m] of the coil and r is the radius [m] of the pressure roll)

The moving step includes moving the center of the pressure roll to the center coordinates (Xc, Yc) of the pressure roll with respect to the center of the paper prill, wherein the center coordinates (Xc, Yc) Can be calculated by Equation (2).

&Quot; (2) "

(Where [beta] is an angle [rad] formed by the moving path of the strip with the vertical direction)

The effects of the apparatus for reducing the variation of the coils and the reduction method according to the present invention are as follows.

First, there is an advantage that deviation of the roughness defect, which is a wrinkle-like defect appearing at right angles to the rolling direction of the coil surface, can be reduced.

Second, there is an advantage that the surface quality of the coil can be secured by reducing the variation in the roughness of the coil surface.

1 is a schematic view of a general temper rolling process.
FIG. 2 is a view showing a state in which a device for reducing the variation of a coil of a coil according to an embodiment of the present invention is used in a rough rolling process. FIG.
3 is a configuration diagram of a device for reducing a squeal deviation of a coil according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating an operation state of a device for reducing a slack variation of a coil according to an embodiment of the present invention.
FIG. 5 is a control block diagram of a device for reducing a slack variation of a coil according to an embodiment of the present invention.
Fig. 6 is a view showing a path through which a pressure roll of a conventional coiling apparatus is moved.
FIG. 7 is a view showing a path through which the pressure roll of the apparatus for reducing the slack of a coil moves according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments are provided to explain the present invention to a person having ordinary skill in the art to which the present invention belongs. Accordingly, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer description.

Prior to the description, the crankshaft refers to a phenomenon in which the plate surface is finely cracked in the direction perpendicular to the rolling direction when the coil is loosened or rewound to perform cold rolling or part processing of the wound general carbon steel hot-rolled coil. -strain) or coil break (coil break).

These defects do not change the mechanical properties of the product, but they cause various problems such as irregular rolling thickness at the time of processing such as cold rolling after hot rolling and surface defects of the steel sheet, Which is inconvenient to use. It is known that the cause of such a fill is due to the yield point stretching phenomenon which can be confirmed in a tensile test of a steel.

FIG. 2 is a view showing a state in which a device for reducing a slack variation of a coil according to an embodiment of the present invention is used in a SKIN PASS MILL process. FIG. 2, the strip S is fed from the paper prill 10 through the pressure roll 20 to the work roll 30 and is rough-rolled, and then wound on a tension reel 40. [ At this time, the pressure roll 20 is rotated by the strip S (S) unwound from the phage prill 10 even if the radius of the coil C is reduced during the uncoiling of the coil C mounted on the phage prill 10 Can be kept constant. Accordingly, it is possible to prevent a deviation in the degree of occurrence of the roughness defect in the longitudinal direction of the strip S, and to secure the surface quality of the constant coil.

FIG. 3 is a configuration diagram of a device for reducing a slack variation of a coil according to an embodiment of the present invention, FIG. 4 is a diagram illustrating an operation state of a device for reducing a slack variation of a coil according to an embodiment of the present invention, FIG. 6 is a control block diagram of a device for reducing a squeal deviation of a coil according to an embodiment of the present invention. FIG.

3 to 5, the apparatus for reducing the sagging deviation of a coil according to the present embodiment is for preventing variation in the degree of sag defects in the longitudinal direction of the strip S, A central shaft 60, a connecting frame 70, a moving frame 80, a support frame 90, a rotation driving unit 100, a linear driving unit 200, and a control unit 300.

The pressure roll 20 is installed on the upper side of the paper prill 10 on which the coil C is mounted and contacts the upper surface of the strip S wound on the paper prill 10, The tension of the strip S can be maintained. The pressure roll 20 can rotate along the moving direction of the strip S by contact with the strip S. [ The strip S released from the phage prill 10 is moved to the pinch roll 5 and the direction of travel can be changed by the pinch roll 5. Here, the pinch roll 5 is provided at an upper portion of one side of the phage prill 10 to assist the movement of the strip S by rotation.

The pressure roll 20 can move so that the moving path of the strip S maintains a predetermined angle beta [rad] with respect to the vertical direction. The pressure roll 20 rotates about the central axis 60 and linearly moves along the periphery of the phage prill 10 so that the travel path of the strip S is shifted from the vertical direction to a predetermined angle beta .

The center shaft 60 is fixed to one side of the phage prill 10 and can rotate about its axis. One end of the connection frame 70 is coupled to the central shaft 60 and the other end of the connection frame 70 is connected to the pressure roll 20. That is, the connection frame 70 coupled to the central shaft 60 is rotated by the rotation of the central shaft 60. By rotating the connection frame 70, the pressure roll 20 rotates about the center axis 60 As shown in FIG.

The movable frame 80 is connected to the connection frame 70 so that one side thereof can be moved in the longitudinal direction of the connection frame 70 and the pressure roll 20 is mounted on the other side. The movable frame 80 can move along the connection frame 70 by the driving force provided from the linear driving unit 200 to be described later.

One side of the support frame 90 is connected to the center shaft 60, and the other side is connected to the rotation driving unit 100, which will be described later. The support frame 90 may be integrally coupled to the central axis 60. The rotation driving unit 100 can transmit the rotational driving force to the center shaft 60 through the support frame 90.

The rotation driving unit 100 is connected to the center shaft 60 and can provide a rotational driving force to the center shaft 60. [ That is, the rotation driving unit 100 can rotate the center shaft 60 through the support frame 90. The rotation driving unit 100 may include a cylinder 110 and a cylinder rod 120.

One end of the cylinder rod 120 is hinged to the other side of the support frame 90, and the other end is located in the internal space of the cylinder 110. The cylinder rod 120 can move linearly in the longitudinal direction of the cylinder 110 by the pressure of the internal space of the cylinder 110. Accordingly, the cylinder rod 120 can rotate the support frame 90 and the center shaft 60 by linear motion.

The linear driving unit 200 is connected to the moving frame 80 and may provide a driving force to the moving frame 70 so that the moving frame 80 moves along the longitudinal direction of the connecting frame 70. The linear driving part 200 may include a lead screw connected to the cylinder or the motor.

The control unit 300 is electrically connected to the rotation driving unit 100 and the linear driving unit 200 and may drive the rotation driving unit 100 and the linear driving unit 200. The controller 300 controls the center line connecting the center of the pulley 10 and the center of the pressure roll 20 as the radius of the coil C decreases due to the strip S being unwound from the pulley 10, The rotation driving unit 100 and the linear driving unit 200 can be controlled so as to maintain the moving path of the strip S and an angle? [Rad] to be described later. The detailed principle of this will be described below.

FIG. 6 is a view showing a path through which a pressure roll of a conventional coil is reduced, and FIG. 7 is a view showing a path through which the pressure roll of the apparatus for reducing the slack variation of a coil moves, according to an embodiment of the present invention. to be.

Referring to FIG. 6, the pressure roll 20 of the conventional device for reducing the slack deviation of the coils moves along the path K while rotating around the central axis 60. When the radius of the coil C is reduced due to the release of the strip S, the strip S released from the pry pril 10 forms a transverse axis (X-axis) with respect to the center of the pry prill 10 The angle? [Rad] changes. Therefore, there is a problem that a deviation occurs in the degree of occurrence of the collision along the length direction of the strip S, since the tension-compression stress of the strip S is varied.

7, the controller 300 calculates the center coordinates O (0,0) of the center of the phage prill 10 and the center coordinates P (Xc, Yc) of the center of the pressure roll 10 using the Cartesian coordinate system, The driving unit 100 and the linear driving unit 200 can be driven so that the center line connecting the straight lines with the moving path of the strip S forms an angle [theta] [rad]. At this time, the controller 300 can determine the angle? By the following equation (1).

[Equation 1]

(Where R is the radius [m] of the coil C and r is the radius [m] of the pressure roll 20)

The control unit 300 calculates the center coordinates Xc and Yc of the center of the pressure roll 20 on the basis of the center coordinate O (0,0) As shown in FIG. The control unit 300 may control the rotation driving unit 100 and the linear driving unit 200 such that the center of the pressure roll 20 moves to the center coordinates Xc and Yc. At this time, as shown in FIG. 7, when the center of the pressure roll 20 is positioned at the center coordinates (Xc, Yc), the angle? Maintains a constant angle. Also, as in Equation (3) below, the angle? Is maintained at a constant angle in the right triangle, so that the angle? Can be maintained at a constant angle.

&Quot; (2) "

(Rad) of the coil (C), r is the radius [m] of the pressure roll 20, and? Is the angle [rad] formed by the moving path of the strip S with the vertical direction)

&Quot; (3) "

Is an angle formed by the strip S released from the phage prill 10 to the horizontal direction (X axis), and? Is an angle formed by the moving path of the strip S to the vertical direction (Y axis) [rad])

In addition, the controller 300 can calculate the radius of the coil C after the strip S is released by the following equation (4). At this time, the number of revolutions (number of revolutions) of the phage prill 10 can be calculated using the number of revolutions (number of revolutions) of the driving motor (not shown) connected to the central axis of the phage prill.

&Quot; (4) "

R = R1- (TxN)

Where R is the current radius of the coil C, m is the initial radius of the coil C, T is the thickness of the strip S unwound from the coil C, The number of turns of the phage prill 10 during the release of the syringe S)

Also, the controller 300 can calculate the initial radius R 1 of the coil C by using the following equation (5).

&Quot; (5) "

π × (R₁²- Z²) × W × δ = M

W is the width [m] of the coil C, and? Is the density of the coil [kg / m], where W is the radius of the coil [ M3], M is the initial weight [kg] of the coil (C)

Hereinafter, a method of reducing the variation in the shedding of a coil according to an embodiment of the present invention will be described.

First, the strip S is unwound from the paper prill 10 on which the coil C is mounted and moved to the pinch roll 5. At this time, the pressure roll 20 contacts the upper surface of the strip S and moves so that the moving path of the strip S maintains a predetermined angle beta (rad) from the vertical direction.

The control unit 300 determines that the center line connecting the center of the phage prill 10 and the center of the pressure roll 20 as the radius of the coil C decreases is smaller than the center of the strip S, the rotation driving unit 100 and the linear driving unit 200 are driven so as to contact the upper surface of the strip S. [ At this time, the control unit 300 can calculate the angle [theta] [rad] by using the above-mentioned equation (1).

The control unit 300 calculates the center coordinates P (Xc, Yc) at which the center of the pressure roll 20 is to be positioned based on the center of the page prill 10 by using the above equation (2).

Next, the control unit 300 drives the rotation driving unit 100 and the linear driving unit 200 to move the center of the pressure roll 20 to the center coordinates Xc and Yc. At this time, as shown in FIG. 7, when the center of the pressure roll 20 is positioned at the center coordinates (Xc, Yc), the angle? Maintains a constant angle. Also, as in Equation (3) below, the angle? Is maintained at a constant angle in the right triangle, so that the angle? Can be maintained at a constant angle.

The apparatus 1 for reducing the shedding deviation of the coil according to the present embodiment is capable of reducing the shedding of the strip S from the coil C even if the radius of the coil C is reduced at the time of uncoiling of the coil C. [ It is possible to prevent variations in the degree of occurrence of the roughness defects in the longitudinal direction of the coil C, thereby ensuring a constant surface quality of the coil.

Although the present invention has been described in detail by way of preferred embodiments thereof, other forms of embodiment are possible. Therefore, the technical idea and scope of the claims set forth below are not limited to the preferred embodiments.

1: Coarse variation deviation reduction device 5: Pinch roll
10: Pfaffle 20: Pressure roll
30: work roll 40: tension reel
60: center shaft 70: connecting frame
80: moving frame 90: supporting frame
100: rotation driving part 110: cylinder
120: cylinder rod 200: linear driving part
300:

Claims (7)

A strip is installed on one side of a phage prill wrapped in a coil form and contacts the strip in a wound state to press the phage prill to move from the phage prill to a roll installed on one side of the phage prill, The pressure roll being movable so that the movement path of the strip maintains a predetermined angle with the vertical direction;
A center shaft which is fixed to one side of the pressure roll and is rotatable about an axis;
A connecting frame having one end connected to the central axis and rotatable with the central axis;
A movable frame having one side connected to the other end of the connection frame and the pressure roll mounted on the other side and movable along the connection frame;
A rotation driving unit connected to the center shaft and capable of providing a rotational driving force to the center shaft;
A linear driving unit connected to the moving frame and capable of providing a driving force to the moving frame so that the moving frame can be moved; And
Wherein the center of the paper prill and the center of the pressure roll are connected to the rotation driving part and the linear driving part so that as the radius of the coil decreases, And a control unit for controlling the linear driving unit,
Wherein the? Is determined by the following equation (1).
[Equation 1]

(Where R is the radius [m] of the coil and r is the radius [m] of the pressure roll) delete delete The method according to claim 1,
Wherein,
(Xc, Yc) at which the center of the pressure roll is to be positioned with respect to the center of the pheriphal is calculated by the following equation (2), and the center of the pressure roll is calculated as the center coordinates (Xc, Yc) And controls the rotation driving unit and the linear driving unit to move the coil.
&Quot; (2) "

(Where [beta] is an angle [rad] formed by the moving path of the strip with the vertical direction) And a moving step of moving the pressure roll which is in contact with the strip so that the moving path of the strip, which is loosened from the pulley equipped with the coil, moves to the roll provided at one side of the paper prill, maintains a predetermined angle with the vertical direction In addition,
Wherein,
And moving the pressure roll so that a center line between the center of the phage prill and the center of the pressure roll maintains an angle [theta] [rad] with respect to the movement path, wherein [theta] / RTI > of claim 1, wherein the method comprises the steps of:
[Equation 1]

(Where R is the radius [m] of the coil and r is the radius [m] of the pressure roll) delete The method of claim 5,
Wherein,
And moving the center of the pressure roll to the center coordinates (Xc, Yc) of the pressure roll with respect to the center of the paper pril,
Wherein the center coordinates (Xc, Yc) are calculated by the following equation (2).
&Quot; (2) "

(Where [beta] is an angle [rad] formed by the moving path of the strip with the vertical direction)

Images