JPH06277718A - Device 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 by rotating width rolling-down dies round a vertical shaft according to a quantity of camber detected. CONSTITUTION:The camber is detected by a camber detector 17 on the outlet side of width rolling-down die 1. A controlling computor 19 calculates a prescribed rotary angle of die according to a detection quantity of camber and an operational signal is outputted by its calculated result to a change-over valve 13. The piston rod 8 of a hydraulic cylinder 6 is moved back and forth by the operation of the change-over valve 13 and the width rolling-down die 1 is rotated by a prescribed angle round an edge 5. In this way, a rolling-down fulcrum of the working surface of the die acting on the slab S deviates to the direction of pass line between the left and right width rolling-down dies and a clockwise moment acts on a rolled down part of the stab S to correct the camber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal plate width reduction device for hot-width reducing a metal plate having a relatively large thickness such as a slab by a large amount of reduction by pressing, particularly a metal plate width reduction device for controlling a camber. Regarding the device.

[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-4-4901.

In the width reduction method disclosed in Japanese Patent Laid-Open No. 62-192222, the slab camber is detected, and at least one of the left and right dies of the width reduction device is moved in the slab passage line direction based on the camber amount. Change the load point of the width reduction die and correct the camber on the output side to reduce the width. By changing the relative position of the left and right width reduction dies in the passage line direction of the slab, when the slab is width reduced, bending can be applied in a desired direction, and the camber on the exit side can be corrected.

Further, in the width reduction method disclosed in Japanese Patent Laid-Open No. 4-4901, when a camber is generated in the slab, there are a plurality of pressure surfaces that are arranged opposite to each other, and the parallel portions and the inclined portions of the pressure surfaces of each step are arranged. The width-reducing dies with the refraction points that form the boundary between them are made different in the line direction, and the phase of the refraction points of the width-reduction dies to be used in opposition is different in the slab transfer line direction in accordance with the camber bending direction of the slab. The width of the slab is reduced in combination with. The width reduction die is moved up and down to switch the clamping surface, and the left and right press slides are moved toward and away from each other.
The camber is corrected by curving the slab in the direction opposite to the direction in which the camber is generated and pressing down the width.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the width reduction method of the 2222 publication, at least one of the left and right width reduction dies is moved along the pass line to control the camber, so that the working range of the width reduction device along the pass line becomes long. Therefore, the camber detector must be installed in a place away from the width reduction device outlet side,
There is a problem that the response of the camber control is low.

Further, in the width reduction method disclosed in Japanese Patent Laid-Open No. 4-4901, in order to control the camber, it is necessary to use an integrated width reduction die having parallel portions whose die working surfaces are vertically different from each other. Therefore, the width reduction die is large,
In addition, the weight is heavy, and a driving device for moving the width reduction die in the slab width direction and the vertical direction is required, which makes the equipment expensive. In addition, there is a limit to the selection of the inclined part and the parallel part of the work surface of the die (the greater the number of stages of the width reduction die, the more
However, it is not possible to flexibly deal with an arbitrary amount of camber.

Further, for example, Japanese Patent Laid-Open No. 62-192222.
In the case of the camber control using the slab width reduction device disclosed in Japanese Patent Laid-Open No. 4901/1992, the former moves the heavy width reduction die in parallel to the pass line, and the latter moves the pass. It will be raised and lowered with respect to the line. That is, in these conventional apparatuses, there is a problem that the high responsiveness of the camber control cannot be expected because the width reduction die is largely moved to control the camber.

Although the continuous cast steel slab has been described as an example of the metal plate, the above problem also occurs in a 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 device which has a high responsiveness for camber control and which can be made compact and lightweight.

[0012]

According to the metal plate width reduction device of the present invention, 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 the metal plate, and to detect the camber detection amount. In the metal plate width reduction device that corrects the camber based on the above, a set of camber detectors is provided near the exit side of the width reduction die, and at least one width reduction die is rotatable about a vertical axis. That is, the metal plate width reduction device of the present invention advances and retracts a pair of width reduction dies arranged on both sides of the pass line in the plate width direction to reduce the width of the metal plate. The camber amount of the metal plate is detected based on the difference between the die position and the position of the side surface of the metal plate detected by a set of camber detectors near the exit side of the width reduction die, and at least one of the camber detection amounts is detected based on the detected camber amount. It has the function of rotating the width reduction die around the vertical axis and correcting the camber. Then, in the correction of the camber, at least one of the width reduction dies is rotated around the vertical axis according to the camber detection amount. Here, the vicinity of the exit side of the width reduction die is 5 from the exit side of the width reduction die.
Defined as within m. When the camber detection reaches 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 width reduction die is driven back and forth by a hydraulic cylinder such as hydraulic pressure or hydraulic pressure. The value of the width-reduced metal plate on the side where the camber amount is inserted is determined by the set position of the width-reduction die or the die position during width reduction. The position of the width reduction die is also obtained from the rotation angle of the width reduction die. A well-known set of position detectors such as an optical type, a pneumatic type, or a photoelectric type is used for detecting the camber amount output side of the width-reduced metal plate. Alternatively, the camber amount may be detected by converting the displacement of the surface of the metal plate into a load using a load cell or the like. The width reduction die is rotationally driven by a hydraulic cylinder such as hydraulic pressure or water pressure, or a combination of a screw mechanism and a motor. The relationship between the amount of camber and the rotation angle of the width reduction die is previously obtained by experiment or calculation, and the result is stored in the control computer.

In the case of this apparatus, in addition to a set of camber detectors in the vicinity of the exit side of the width reduction die, the rotation angle of the width reduction die is only slightly changed, and the left and right reduction dies that substantially act on the metal plate are The rolling fulcrum of the work surface can be changed, and the camber can be controlled with high response.

[0014]

Operation: At least the width reduction die on the side where the width-reduced metal plate is bent is rotated so that the inclined portion of the die work surface is opened around the vertical edge on the die work surface exit side. As a result, the rolling fulcrums of the working surface of the die that act on the metal plate are displaced from each other in the pass line direction between the left and right rolling dies. As a result, a moment acts on the pressed portion of the metal plate so as to correct the camber.

[0015]

1 is an example of a width reduction device of the present invention, schematically showing a width reduction device for a continuously cast steel slab, 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 (see FIGS. 2 and 3). Therefore, the two sets of hydraulic cylinders 6 are the expandable joints of the link mechanism. 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 camber detector 17 and a reduction die position detector 18 are arranged on the downstream side of the outlet 1 m of the width reduction die 1. The camber detection device 17 and the reduction die position detector 18 are optical detectors equipped with an image sensor. The camber detector 17 and the rolling die position detector 18 are connected to a control computer 19, and the comparison is performed by the control computer 19 to obtain the camber amount. The relationship between the camber amount and the die rotation angle has been obtained in advance by experiment or theoretical calculation, and the result is stored in the control computer 19. The switching valve 13 is the control computer 1
Controlled by 9.

In the width reduction device configured 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 is left and right open. When the slab S stops between the width reduction dies 1, the interval between the width reduction dies 1 is gradually narrowed and the slab S is reduced in the width direction.

On the exit side of the width reduction die 1, the camber C is detected by the camber detector 17. The control computer 19 calculates a required die rotation angle based on the camber detection amount, and outputs the operation signal to the switching valve 1 according to the calculation result.
Output to 3. By operating the switching valve 13, the hydraulic cylinder 6
The piston rod 8 moves back and forth, 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 1a and 1b are rotated clockwise around the ridge 5 by a required angle. As a result, the reduction fulcrum of the work surface of the die that acts on the slab S is the width reduction die 1 on the left and right.
The camber C is corrected by the fact that the moments in the clockwise direction act on the pressed portion of the slab S while being offset from each other in the pass line direction between a and 1b.

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 another embodiment of the present invention. In this embodiment, only the width reduction die 1a on the left side of the pass line L is rotated. Right side width reduction die 1b
Is the initially set posture, that is, the parallel part 3 of the die work surface.
Is parallel to the pass line L. The operation of the camber correction according to this embodiment is similar to that shown in FIG.

[0023]

In the metal plate width reduction device of the present invention, at least one width reduction die is rotated about the vertical axis in accordance with the detected camber amount. Therefore, the camber detector can be arranged near 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 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 a method of correcting a camber by another device example.

[Explanation of symbols]

 1 Width reduction die 2 Sloping portion of die working surface 3 Parallel portion of die working surface 5 Ridge of die working surface 6 Hydraulic cylinder 9 Housing 13 Switching valve 15 Hydraulic pump 17 Camber detector 18 Rolling die position detector 19 Control computer C Camber S Slab

Claims (1)

[Claims] 1. A metal plate width reduction device for 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 a metal plate, and correcting the camber based on the detected amount of camber. A metal plate width reduction device, comprising a set of camber detectors near the exit side of the reduction die, and at least one width reduction die being rotatable around a vertical axis.