JPH06277717A - Method for rolling-down width of metallic sheet - Google Patents

Abstract

PURPOSE:To improve responsiveness in camber control, to miniaturize the device and to make it light in weight. CONSTITUTION:A pair of width rolling-down dies 1 arranged on both sides of a pass line L are moved back and forth in the width direction to roll down a metallic sheet S and a load difference in the plate width direction given to a pair of vertical rolls 19 which come in contact respectively with both sides of the metallic sheet S is detected at the neighborhood on the outlet side of the width rolling-down dies 1. At least one of the width rolling-down dies 1 is rotated to correct the camber so that the load difference is reduced to zero.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for hot-width reduction of a metal plate having a relatively large thickness such as a slab by a press with a large reduction amount, and more particularly to a width reduction method for detecting and controlling a camber.

[0002]

2. Description of the Related Art A continuously cast steel slab will be described as an example of a metal plate having a relatively large thickness.

It has been practiced to continuously cast a slab to a constant width and reduce the width by a press to obtain a cross-sectional dimension required in a rolling process. In the width reduction process, the slab is intermittently fed in the longitudinal direction of the slab, and when the slab is stopped, the slab is reduced from the left and right by dies arranged on both sides of the pass line. Conveying devices having horizontal slab supporting surfaces, such as a roller table and a pinch roll, are arranged on the inlet and outlet sides of the width reduction die, respectively. By this carrying device, the metal plate is intermittently fed into the width reduction die by the length of one reduction step.

The slab may bend right and left on the exit side of the width reduction die due to the deviation of the left and right width reduction dies, the uneven shape of the slab, and the uneven temperature distribution. Such bending, that is, as a width reduction method for controlling the camber,
For example, there is a slab width reduction method disclosed in JP-A-62-192222 or JP-A-3-230803.

In the width reduction method disclosed in JP-A-62-192222, the camber amount of the slab is detected by comparing the signals of two camber detectors installed on the exit side of the width reduction die. According to the width reduction method of Japanese Patent Laid-Open No. 3-230803, the camber amount is detected by comparing the signals of two camber detectors installed on the inlet and outlet sides of the width reduction die, and the left and right dies of the width reduction device are based on the camber amount. At least one of them is moved in the direction of the passage line of the slab to change the load points of the left and right width reduction dies, and the width reduction is performed while correcting the camber on the output side. By changing the relative positions of the left and right width reduction dies in the slab passage line direction, when the slab is width-reduced, it is possible to bend in a desired direction and correct the camber on the delivery side.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the width reduction method disclosed in Japanese Patent No. 2222, two camber detectors are required on the left and right width reduction die exit sides in order to detect the amount of camber, and the intervals between the camber detectors are also required to some extent. Therefore, the camber amount is detected at a position apart from the width reduction die, and there is a problem that the responsiveness of the camber control is low.

Further, Japanese Patent Laid-Open No. 62-192222,
In the width reduction method disclosed in JP-A-3-230803, since the camber is controlled by moving at least one of the left and right width reduction dies along the pass line, the working range of the width reduction device along the pass line becomes long. . Therefore, the camber detector must be installed at a place away from the exit side of the width reduction device, and there is a problem that the response of the camber control is low.

Although the continuous cast steel slab has been described as an example of the metal plate, the above problem also occurs in the metal plate having the same dimensions as the continuous cast steel slab.

An object of the present invention is to provide a metal plate width reduction method which has a high responsiveness in camber control and which can reduce the size and weight of the apparatus.

[0010]

According to a first aspect of the present invention, there is provided a metal plate width reduction method, in which a pair of width reduction dies arranged on both sides of a pass line are moved back and forth in the plate width direction to reduce the width of a metal plate. In the metal plate width reduction method that detects the camber amount of the metal plate near the exit side of the die and corrects the camber based on the detected amount of the camber, a vertical roll that contacts both side surfaces of the metal plate near the exit side of the width reduction die. The load difference in the plate width direction applied to the pair or the vertical drive roll pair is detected, and at least one width reduction die is rotated so that the load difference becomes zero.

Here, the vicinity of the exit side of the width reduction die is defined as within 5 m from the exit side of the width reduction die. When the camber amount detection position is located on the downstream side of more than 5 m from the exit side of the width reduction die, quick camber control cannot be performed and the camber amount becomes large.

The position of the vertical roll pair and the gap are set based on the reduction setting position of the width reduction die.

To detect the load difference, a well-known load cell such as a resistance strain type, a magnetostriction type, or a capacitance type is used. Each vertical roll may be a metal plate transport device (pinch roll).

In the metal plate width reduction method according to the second aspect of the invention, the pair of width reduction dies arranged on both sides of the pass line are moved back and forth in the plate width direction to reduce the width of the metal plate in the vicinity of the exit side of the width reduction die. In the metal plate width reduction method of detecting the camber amount of the metal plate and correcting the camber based on the camber detection amount,
The camber is detected based on the difference between the set position of the width reduction die or the position of the die during width reduction and the position of the side surface of the metal plate detected near the exit side of the width reduction die, and at least one width reduction die is rotated. .

The set position of the width reduction die or the position of the die during width reduction, and the position of the side surface of the metal plate detected near the exit side of the width reduction die are known load cell, optical, pneumatic, or photoelectric position detection. Vessels are used.

As a device for controlling the camber, for example, a width reduction press device disclosed in Japanese Patent Laid-Open No. 4-4901 may be used.

However, the above-mentioned JP-A-4-4901
In the case of the width reduction device of the publication, in order to perform the camber control, it is necessary to provide a plurality of stages of reduction die surfaces which are arranged opposite to each other and have different angles formed by the inclined portion of the die work surface and the side surface of the metal plate. Since the die has to be moved up and down with respect to the pass line and a large amount of movement is involved, there is a problem that the high responsiveness of the camber control cannot be expected. Further, since there is a limit to the selection of the pressing die surfaces provided in the plurality of stages, there is a problem that it is not possible to flexibly cope with an arbitrary camber amount. As an apparatus for solving these problems, for example, as shown in FIG. 2 or 3, at least one width reduction die is rotated so that the reduction fulcrum of the die work surface acting on the metal plate is conveyed between the left and right dies. A width reduction device may be used that is offset from each other in the direction. In this case, the camber can be controlled with high response because the rolling fulcrum of the work surface of the width rolling dies on the left and right, which acts on the metal plate, can be largely changed only by minutely changing the rotation angle of the width rolling die.

In the above case, the width reduction die is moved forward and backward by a hydraulic cylinder such as hydraulic pressure or water pressure to adjust the reduction amount. The width reduction die is rotated by rotating the width reduction die around, for example, a vertical edge on the die work surface exit side. For rotation of the width reduction die, a hydraulic cylinder such as hydraulic pressure or water pressure, or a combination of a screw mechanism and a motor is used.

The load difference between the pair of vertical rolls detected in the first aspect of the invention, the camber amount detected in the second aspect of the invention, and the control amount of the width reduction die (in the case of the width reduction device disclosed in JP-A-4-4901). The relationship between the selection of the width-reducing die surfaces facing each other and the amount of rotation when the width-reducing die is rotated) is previously obtained by experiment or calculation, and the result is stored in a control computer or the like.

Further, the side of the metal plate may be supported on the entrance side of the width reduction die to perform the width reduction. To support the side surface of the metal plate, a pinch roll or a metal plate guide along the pass line direction is used. The pinch roll is in contact with the side surface of the metal plate and is composed of a pair of vertical rolls whose roll gap can be adjusted.

[0021]

[Operation] Due to the movement of the width reduction die, the reduction fulcrums of the work surface of the die acting on the metal plate are displaced from each other in the pass line direction between the left and right width reduction dies, and a bending moment is applied to the portion of the metal plate subjected to the width reduction. Occurs. The width reduction die is rotated according to the load difference detected on the width reduction die exit side, the setting position of the width reduction die, etc. so that a bending moment in the direction opposite to the bending of the metal sheet acts on the metal plate. To fix.

According to the present invention, one camber detector may be arranged near the exit side of the width reduction die, and the camber can be detected at a position closer to the exit side of the width reduction die.
The camber can be controlled with high response. Further, by combining with a camber control method for rotating the width reduction die as a device for controlling the camber, the action can be taken more quickly than the conventional method, so that the camber can be controlled with higher response.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically shows an example of a width reduction device for a continuously cast steel slab for carrying out the method of the present invention, and is a perspective view of a main part of the width reduction device.

The width reduction die 1 of the width reduction device is arranged on the left and right of the pass line L so as to be able to move forward and backward. The working surface of the die is composed of an inclined portion 2 and a parallel portion 3. Slope 2
Are inclined so that the distance between the facing die working surfaces becomes narrower toward the outlet. Before the start of the width reduction, the width reduction dies 1 facing each other are symmetrical with respect to the pass line L and are parallel to each other.
Are set to be parallel to each other. The surface following the parallel portion 3 is a flank 4.

Two sets of hydraulic cylinders 6 are arranged at intervals along the direction of the pass line L. The cylinder body 7 of each hydraulic cylinder 6 is pin-connected 10 to the front surface of the housing 9, and the piston rod 8 is pin-connected 11 to the back surface of the width reduction die 1. Therefore, the two sets of hydraulic cylinders 6 are expandable nodes of the link mechanism (see FIG. 2).
reference). The width reduction amount and the die rotation angle can be adjusted by adjusting the strokes of the piston rods 8 of the two hydraulic cylinders 6. A pump 15 is connected to each of the hydraulic cylinders 6 via a switching valve 13.

A pinch roll 17 having an adjustable roll gap is arranged near the entrance of the width reduction die 1.
While the slab S is being fed, the pinch roll 17 is open and does not restrain the slab S. Further, the pinch rolls 17 hold both side surfaces of the slab S and restrain the slab S during the slab width reduction.

A pair of vertical rolls 19 is arranged on the downstream side of the outlet 1 m of the width reduction die 1. The position between the vertical rolls is
The width reduction dies 1a and 1b are set at the reduction setting positions. Each of the vertical rolls 19 is rotationally driven according to the feed speed of the slab S. For each vertical roll 19a, 19b,
A resistance strain type load cell 21 is attached. The load cell 21 is connected to the camber calculator 23 and the die rotation angle calculator 25. The relationship between the camber amount and the die rotation angle is obtained in advance by experiment or theoretical calculation, and the result is stored in the die rotation angle calculator 25. The calculation result of the die rotation angle calculator 25 is input to the controller 27, and the switching valve 13 is controlled by the controller 27.

In the width reduction device constructed as described above, the slab S is intermittently sent along the pass line L by a roller table (not shown). While the slab S is being fed, the width reduction die 1 and the pinch roll 1
7 is open to the left and right. When the slab S stops between the width reduction dies 1, the slab S is gripped by the pinch rolls 17. Then, the interval between the width reduction dies 1 is gradually narrowed to reduce the slab S in the width direction.

The load exerted by the slab S on the vertical roll 19 on the exit side of the width reduction die 1 is detected by each load cell 21. The detected load is input to the camber calculator 23, and the camber amount is obtained based on the load difference.
The die rotation angle calculator 25 calculates a required die rotation angle based on the camber detection amount, and the controller 27 outputs an operation signal to the switching valve 13 according to the calculation result. Switching valve 13
The piston rod 8 of the hydraulic cylinder 6 advances and retreats, and the width reduction die 1 rotates around the edge 5 by a required angle. As shown in FIG. 2, when a camber C that bends to the left with respect to the pass line L occurs, the left and right width reduction dies 1
Rotate a and 1b around the edge 5 in the clockwise direction by a required angle. A clockwise moment acts on the pressed portion of the slab S between the left and right width reduction dies 1a and 1b,
Camber C is modified. Since the slab S is constrained by the pinch roll 17 at the die entrance, rotation of the slab S on the die entrance side is prevented.

When the width reduction for one step of the slab S is completed,
The width reduction die 1 is retracted. Then, the slab S is advanced by the roller table by the length of the next one rolling down step.

FIG. 3 shows an embodiment of the second invention. The same devices as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted.

Die rotation angle detectors 29 are attached to the width reduction dies 1a and 1b, respectively, and a slab position detector 31 is arranged downstream of the outlets 3m of the width reduction dies 1a and 1b. The die rotation angle detection device 29 is
It is an inductance type angle detector. The slab position detection device 31 is composed of an optical detector equipped with an image sensor. These detectors 29 and 31 are connected to the camber calculator 23.

In this embodiment, only the width reduction die 1a on the left side of the pass line L is rotated. The width reduction die 1b on the right side has an initially set posture, that is, the parallel portion 3 of the die work surface is parallel to the pass line L.
The camber amount is obtained by the difference between the detected values on the upstream side (the die pressure setting position or the die position detected by the die rotation angle detector 29) and the downstream side (the slab position detected by the slab position detector 31). The operation of the camber correction according to this embodiment is similar to that shown in FIG.

[0034]

According to the metal plate width reduction method of the present invention, at least one width reduction die is rotated. Therefore, the camber detector can be arranged close to the exit side of the width reduction die, so that the responsiveness of the camber control is improved. Further, since it is not necessary to move the width reduction die along the pass line or vertically, it is possible to reduce the size and weight of the device.

[Brief description of drawings]

FIG. 1 is an example of a width reduction device for a continuously cast steel slab for carrying out the method of the present invention, and is a perspective view schematically showing a main part of the device.

FIG. 2 is a plan view illustrating a method of correcting a camber by the device shown in FIG.

FIG. 3 is a plan view illustrating another method of correcting the camber.

[Explanation of symbols]

 1 Width reduction die 2 Sloping portion of die working surface 3 Parallel portion of die working surface 5 Edge of die working surface 6 Hydraulic cylinder 9 Housing 13 Switching valve 15 Hydraulic pump 17 Pinch roll 19 Vertical roll 21 Load cell 23 Camber calculator 25 Die rotation Angle calculator 27 Controller 29 Die rotation angle detector 31 Slab position detector C Camber S Slab

Claims (3)

[Claims] 1. A camber of a metal plate is detected by advancing and retracting a pair of width reduction dies arranged on both sides of a pass line in the plate width direction to reduce the width of the metal plate, and detecting the camber amount of the metal plate near the exit side of the width reduction die. In the metal plate width reduction method that corrects the camber based on the detected amount, detects the load difference in the plate width direction applied to the vertical roll pair or the vertical drive roll pair that are in contact with both side surfaces of the metal plate near the exit side of the width reduction die. Then, at least one of the width reduction dies is rotated so that the load difference becomes zero. 2. A camber amount of the metal plate is detected in the vicinity of the exit side of the width reduction die by advancing and retracting a pair of width reduction dies arranged on both sides of the pass line in the plate width direction to detect the camber amount of the metal plate. In the metal plate width reduction method for correcting the camber based on the detected amount, the difference between the set position of the width reduction die or the position of the die during width reduction and the position of the side surface of the metal plate detected near the exit side of the width reduction die is determined. A metal plate width reduction method comprising rotating at least one width reduction die based on the above. 3. The method for reducing the width of a metal plate according to claim 1, wherein the side of the metal plate is supported on the entrance side of the width reduction die to perform the width reduction.