JPH01107944A - Strip continuous casting equipment - Google Patents

Abstract

PURPOSE:To prevent the development of bend of a cast strip by arranging snaking rate detector at outlet side of the cast strip and independently controlling the rolling reduction rate at one side of the cast strip in accordance with the detected snaking rate. CONSTITUTION:A rotating position detector 16 and the snaking rate detector 11 setting to both surfaces of the front and back of the cast strip are arranged at the outlet side of the cast strip in the continuous casting machine 3. The cast strip 12 is introduced to the snaking rate detector 11 through a rolling reduction device 8, heat holding table 9 and shearing machine 10. Then, touch rolls 14 at upper and lower sides are pushed to the front and back surfaces of the cast strip 12 by a driving cylinder 17 and movement upward and downward of the rolls 14 is detected with the rotating position detector 16, to detect the snaking rate. Successively, one side of the rolling reduction rate of the rolling reduction device 8 in accordance with the snaking rate is independently controlled. As one side rolling reduction rate in accordance with the snaking rate of the cast strip 12 can be controlled by feedback, the development of bend of the cast strip 12 is prevented.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to continuous thin slab casting equipment comprising a continuous thin slab casting machine and a group of devices that control the meandering of the thin slab following the exit side of the machine. .

For example, if there is even a slight deviation in the thickness in the width direction of a cast slab cast by a continuous thin steel slab casting machine, such as a belt caster, etc. is meandering.

Furthermore, when the cast slab disclosed in Japanese Patent Application Laid-Open No. 62-54501 is wound into a coil, the ends of the coil shift depending on the amount of meandering, making it difficult to wind it neatly.

By the way, the thickness of the slab produced by a continuous thin slab casting machine is
The thickness of a continuous slab cast with a conventional continuous casting machine is 1710.
~1/15 is common, and if slabs of the same weight are cast with the same width, the length of the thin slab will be 10 to 15 times that of a continuous slab, and it will not be possible to reach the desired slab size. It depends, but usually 1
The length is around 00m.

In such a long slab, even if the amount of meandering per unit length is small, there will be a considerable amount of deviation by the time the slab reaches the coil winding or rolling process entrance side.

For example, when winding a meandering thin slab in a line of equipment that has winding equipment between casting equipment and rolling equipment, the cooling process at the end of the thin slab differs in the width direction, resulting in resistance to deformation during the next rolling. This causes a difference in the material, which causes bending in the material, which increases the variation in material properties, makes it difficult to handle the coil because the ends of the thin slab are uneven, and causes the center of gravity to shift during winding, causing the coil to fall over. There are many disadvantages, such as the inability to wind the paper.

(Prior Art) There is no known technology for controlling the meandering of a thin slab cast by a continuous thin slab casting machine.

(Problems to be Solved by the Invention) Therefore, it is an object of the present invention to propose a new continuous thin slab casting equipment that can detect the meandering amount of a thin slab after casting and control the meandering amount within a certain range. The purpose of

(Means for Solving the Problems) This invention includes a meandering amount detection device that detects the meandering amount of the slab, which is arranged on the slab outlet side of a thin slab continuous casting machine, and detects the meandering amount by this meandering amount detection device. A thin slab reduction device that independently performs one-sided rolling of a thin slab based on an output signal from a reduction amount control device that selects the amount of reduction into a thin slab according to the meandering amount of the thin slab is used in combination with a thin slab continuous casting machine and meandering. This continuous casting equipment for thin slabs is characterized in that it is installed between the equipment and the quantity detection device.

(Function) The continuous thin slab casting machine is equipped with a roll that controls the thickness of the thin slab on the exit side and a meandering amount detection device that can detect the meandering amount of the slab behind this roll. By adjusting the amount of reduction of the rolls in the width direction of the thin slab according to the meandering amount of the piece, it is possible to control the meandering amount of the thin slab at all times within an allowable range.

(Example) FIG. 1 shows an equipment for continuously casting thin slabs according to the present invention.

In the figure, 1 is a tandaitsu, 2 is molten steel, 3 is a thin slab continuous casting machine (hereinafter referred to as casting machine) whose illustrated example is a twin-belt caster, 4 is a mold lower roll, 5 is a pinch roll,
6 is a bending roll, 7 is a straightening opening, a knope 8 is a thin slab rolling device (hereinafter referred to as a rolling device), 9 is a heat-retaining table knope 10 is a shear, 11 is a meandering amount detecting device (hereinafter referred to as a detecting device),
12 is a thin slab, and 13 is a reduction amount control device (hereinafter referred to as a control device).

The molten steel 2 in the tundish 1 is injected into the casting machine 3, and the thin slab 12 completely solidified in the casting machine 3 is drawn downward by the mold lower roll 4 and the pinch roll 5 and bent to a constant curvature by the bending roll 6.

A thin slab 12 bent at a constant curvature is straightened horizontally by a straightening roll 7. Then, the thin slab 12 passes through a rolling device 8, a heat insulating table 9, and a shear 10, and is led to the next winding process or rolling process (not shown). The amount of meandering of the thin cast piece 12 is detected by a detection device 11 after passing through the heat insulating table 9 and the shear 10.

As shown in FIG. 2, the detection device 11 includes a touch roll 14 for detecting the position of the thin slab 12,
It consists of a rotatably fixed support rod 15 that supports the support rod 15, a rotational position detector 16 such as a celsin mounted on the rotation axis of the support rod 15, and a drive cylinder 17 that rotates the support rod 15. At the same time, the touch roll 14 is pressed against the front and back surfaces of the thin slab 12 by the drive cylinder 17, and the vertical movement of the touch roll 14 is detected by the rotational position detector 16, thereby detecting the amount of meandering.

The detected amount of meandering is input to the control device 13, which selects the amount of reduction according to the amount of meandering, and instructs the reduction device 8 to set an appropriate amount of reduction.

FIG. 4 shows the relationship between the amount of displacement and the amount of rolling reduction of the thin slab.

Here, the displacement amount is δ, the gap between the draft control roll and the touch roll is β, the width of the thin slab is W, the roll radius is r, and the angles in the figure [: OD = θ, CD = Oout and AB = Din Then, (r-δ)2+β2. = r2-(2). Furthermore, from the above equation (3), Din/Dou for the displacement amount of δ
It can be seen that by controlling the t ratio, that is, the thickness difference, a slab without bending can be obtained.

As shown in FIG. 3, the rolling device 8 includes a rolling control roll 1.
8 and a reduction cylinder 1 provided at both ends of each roll.
9a and 19b, the control device 13 shown in FIG.
The roll gap on each side of the thin slab 120 is adjusted independently by driving the reduction cylinders 19a and 19b.

In other words, with respect to the drawing direction of the thin slab, if it bends to the left as shown in Figure 4, the amount of reduction on the left side should be adjusted with respect to the displacement amount δ, and conversely, if it turns to the right, the amount of reduction on the right side should be adjusted. Bye.

Next, a specific example in which the equipment shown in FIG. 1 is applied to actual operation will be described.

Low-order aluminum killed molten steel was cast at a casting speed of 15 m/min under the following conditions: casting thickness: 3 Q mm, casting width: 11000 rn, and gap between the touch roll and the reduction control roll: 5 m.

As a result of giving the gap difference of the reduction control roll according to the meandering amount shown in FIG. 5, that is, the displacement amount δ detected by the rotational position detector 16, the amount of bending of the thin slab in the width direction is controlled within 15 mm. I was able to do it.

In addition to the configuration shown in FIG. 2 as a meandering amount detection device for a thin cast slab, it is also possible to use means for attaching a differential transformer to the drive cylinder 17, or a completely different position detection device using eddy current or a radar position detection device. Good too.

(Effects of the Invention) According to the present invention, it is possible to provide equipment useful for realizing feedback control that adjusts the reduction amount according to the meandering amount of a thin slab, and it is possible to easily manufacture a thin slab without bending.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the structure of the thin slab continuous casting equipment, Figure 2 is an explanatory diagram of the meandering amount detection device, Figure 3 is an explanatory diagram of the thin slab rolling down device, and Figure 4 is an explanatory diagram of the thin slab rolling down device. Fig. 5 is a graph showing the relationship between the displacement and the reduction in a thin slab having a thickness of 3Q mm and a width of 1000 mm. ■... Tandish 2... Molten steel 3... Continuous casting machine 4... Mold lower roll 5... Pinch roll 6... Bending roll 7... Straightening roll End... Thin slab reduction device 9... Heat retention table 10... Shear 11... Meandering amount detection device
12... Thin slab 13... Control device 14.
...Touch roll 15...Support rod 16.
・・Rotation position detector 17 ・・Drive cylinder 18 ・・Down control roll

Claims (1)

[Claims] 1. A meandering amount detection device for detecting the meandering amount of the slab is placed on the slab outlet side of the continuous thin slab casting machine, and the rolling into the thin slab is performed according to the meandering amount detected by this meandering amount detection device. A thin slab reduction device that independently performs one-sided rolling of the thin slab based on an output signal from a reduction amount control device that selects the amount is installed between the thin slab continuous casting machine and the meandering amount detection device. Features continuous casting equipment for thin cast slabs.