JPH0324295B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Related Industrial Field) The present invention relates to manufacturing equipment for continuously rolling continuous casting into ultra-thin slabs.

(Prior Art) Continuous casting machines that continuously cast ultra-thin slabs have conventionally used a sheath belt caster, a rotary caster, or the like. In all of these, an endless metal belt is used on at least one side of the portion corresponding to the mold wall. However, this type of continuous casting machine has a short belt life, especially continuous casting machines for steel whose melting temperature is high, and the slab length is only about 1000 meters, resulting in low production capacity. In addition, if the thickness of the slab is made as thick as possible, the production volume of slabs relative to the life of the belt will increase, but rolling will take longer and require a multi-stage rolling mill, which will not only increase the cost of rolling equipment but also increase the energy cost for rolling. To increase.

In order to overcome both of these drawbacks, thin slabs produced by multiple casting machines are wound into a coil.
The pieces cut to an appropriate length are held, heated in a recuperator, rewound, and sent to a single rolling line, so that the production capacity of the rolling line is almost equal to the production capacity of multiple continuous casting machines. A method is being considered.

However, even with this method,
Once the coil has been wound up, it is necessary to retain and recuperate the heat until it is sent out for the rolling process, resulting in wasted thermal energy. Furthermore, in terms of equipment, devices such as a winder and unwinder for thin slabs, a heat retention furnace for coils, a recuperation furnace, etc. are required.

(Problem to be solved by the invention) In order to continuously and directly roll ultra-thin slabs that have been continuously cast, it is necessary to equalize the production capacity of the continuous casting machine and the rolling mill. It was impossible. The present invention is intended to enable continuous production without reducing production capacity by arranging one rolling line for a plurality of continuous casting machines.

(Solution Means of the Invention) In a hot sheet manufacturing facility consisting of a plurality of continuous casting lines and a single rolling line for rolling the slabs cast by the continuous casting line,
Between the continuous casting line and the rolling line, a looper roll consisting of a rotating roll supported by a rotating frame rotatable on a rotating frame, a pair of tiltable upper and lower rolls following the rotating roll, and a clampable and slab width A slab direction changing device comprising a slab guide roll consisting of a pair of upper and lower rolls that can be driven to travel in the direction is provided, and the plurality of continuous casting lines are set at a predetermined angle with respect to the direction changing device. It is characterized by being arranged radially.

(Embodiment of the Invention) 1 is a thin plate continuous casting machine, 2 is a secondary cooling zone, 3 is a drawing device, and 4 is a guide table, which constitute a series of continuous casting lines. As shown in FIG. 2, a plurality of continuous casting lines, in this example, three rows of continuous casting lines No. 1, No. 2, and No. 3, are arranged radially around the direction changing device 5 placed behind them. It is arranged. That is, the No. 1 casting line is arranged at an angle of α ₁ with respect to the No. 2 casting line, and the No. 3 casting line is also arranged at an angle of α ₂ . The No. 2 casting line is arranged on the same axis as the following rolling line. A secondary drawing device 6, a cutting device 7, an edge heater 8, a scale removing device 9, and a rolling mill 10 are arranged in series on the rolling line following the direction changing device 5, and several coilers 25 are installed at the rear end of the rolling line ( In this example, two units 25a and 25b are installed.

The direction changing device 5 rotates the slab 12 continuously into three rolling lines in order to insert the slab 12 continuously fed from one of the upstream continuous casting lines into the rolling line at the rear.
It is composed of three stages of rolls so that it can be bent dimensionally and the slab 12 can hang down freely. First, on the entry side of the direction changing device 5, a turning roll 13 is rotatably supported by a turning frame 15 which is rotatably supported on a turning frame 14. Then, the turning roll
The three axes are always orthogonal to each other. This means that when the slab 12 is slackened downward by the rear upper and lower looper rolls 16 and 17, the slab 12
This is very effective in suppressing the distortion occurring in 2. Initially, the lower looper roll 17 is located at the level of the rear lower slab guide roll 21 and the pass line of the rolling line when the tip of the slab passes through. When the tip of the slab reaches the upper slab guide roll 20 and the lower slab guide roll 21 supported by the traveling frame 23 and is clamped by the operation of the clamping device 22, the tip of the slab reaches the traveling frame 23 by the operation of the traveling drive device 24.
The tip of the slab is bent in the width direction in order to be inserted into the rear secondary drawing device 6. However, in order to keep the bending stress and strain as low as possible, the upper looper roll 16 is moved to the roll pressing device 18. While pressing the slab 12 against the slab 12, the tilting device 19 consisting of a pair of left and right cylinders pushes the slab 12 downward (FIG. 6). It is desirable that the pressing down speed be synchronized with the casting speed to minimize the tensile stress generated inside the slab.

The upper and lower looper rolls 16 and 17 remove the slab 12 when the tip of the slab is sufficiently slack at the rear direction conversion device 5 where it is caught in the secondary drawing device 6.
be freed from. Thereafter, the slab 12 is continuously fed out from the casting line while maintaining a sagging state due to its own weight. Slab 12 has an average temperature of 900
It is fed into the rear rolling line via this direction changing device while being maintained at a temperature in the range of ~1300°C.

The rolling line includes a cutting device 7 that cuts the slab 12 into appropriate lengths, an edge heater 8 that maintains the slab 12 at a uniform temperature, and a scale removal device 9 that removes oxidized scale from the surface of the slab, upstream of the rolling mill 10. The thin plate arranged and rolled by the rolling mill 10 is wound up by the coiler 25 via the conveyance table 11. Usually, two coilers 25 are arranged, 25a and 25b, so that the operation will not be delayed even if one of the coilers is stopped.

26 is a hot water pot, and 27 is a molten metal.

(Operation) The No. 2 and No. 3 casting lines are stopped, and continuous casting is first performed using the No. 1 casting line. The slab produced in the No. 1 casting line is continuously fed into the rolling line by the direction changing device 5. On the other hand, it is No. 1 in terms of belt replacement due to belt life.
When stopping the casting line, continuous casting is performed in either of the remaining casting lines No. 2 or No. 3, the turning roll 13 attached to the direction changing device 5 is turned into the corresponding casting line, and The slab 12 is supplied to the rolling line by operating the looper rolls 16, 17 and slab guide rolls 20, 21, respectively.

When considering the operating rate of a conventional thin plate continuous casting machine, assuming that the belt has a slab length of 1000 m, the belt will have a life of about 167 minutes if the slab is cast at a casting speed of 6 m/min. Meanwhile, replace the belt,
The preparation time for the next casting is 45 minutes, and the belt replacement time is 45 minutes.
Assuming a total of 135 minutes, including 30 minutes to replace the hot water pot, 60 minutes to prepare the dummy bar, the net operating rate is η = 167 (minutes) / 167 (minutes) + 135 (minutes) x 100 = 55 (%)
) becomes. In reality, the above operating rate will be in the 50-40% range due to breakouts, slab width changes, etc. Furthermore, if the casting speed is increased in order to increase productivity, the frequency of belt replacement increases accordingly, further reducing the operating rate. By installing one rolling mill line for multiple continuous casting machine lines as in this embodiment, it is extremely efficient to operate the rolling line at full capacity.

(Effects of the invention) 1) Lines for supplying slabs are arranged in parallel,
Since it is connected to one thin plate rolling line, thin slabs can be supplied according to the production capacity of the rolling line.

2) Since the slabs from the continuous casting machine can be directly supplied directly to the rolling line, there is no need for winders, unwinders, holding furnaces, or recuperators, and there is no need for large spaces, making the equipment extremely inexpensive. Become something. Also, thermal energy loss is extremely low.

3) Since the slab draws a loop using the direction changing device, the casting speed is allowed to vary slightly compared to the rolling speed, making casting control very easy.

4) In particular, the direction changing device that connects the continuous casting machine and the rolling line includes a rotating roll supported by a rotating frame that is rotatable on a rotating mount, a looper roll and a clamp consisting of a pair of tiltable upper and lower rolls following the rotating roll. It consists of a slab guide roll consisting of a pair of upper and lower rolls that can be driven and run in the width direction of the slab, and the swing roll is supported by a swing frame that can rotate on a stand, so that the axis can be rotated. Since it is always orthogonal to the slab, the distortion that occurs in the slab can be kept to a minimum when the slab is sagged downward by a pair of upper and lower looper rolls at the rear. Then, through a pair of upper and lower tiltable looper rolls, a pair of upper and lower slab guide rolls that can be clamped and driven to run in the width direction of the slab create sufficient slack while minimizing bending stress and strain. , it can be sent accurately and smoothly to the next rolling equipment.

[Brief explanation of the drawing]

FIG. 1 shows a side view of hot sheet manufacturing equipment according to the present invention. Figure 2 is also a plan view. Figure 3 is the first
FIG. FIG. 4 is also a sectional view taken in the direction of arrows. FIG. 5 is also a sectional view taken in the direction of arrows. FIG. 6 is a side view showing the relationship between the slab and each roll in the direction changing device. Figure 7 is also a plan view. In the figure: 1... Thin plate continuous casting machine, 2... Secondary cooling zone, 3... Drawing device, 4... Guide table, 5... Direction changing device, 6... Secondary drawing device,
7... Cutting device, 8... Edge heater, 9...
Scale removal device, 10...Rolling machine, 11...Transport table, 12...Slab, 13...Swivel roll, 14...Swivel mount, 15...Swivel frame,
16... Looper roll (upper), 17... Looper roll (lower), 18... Roll pressing device, 19
...Tilt device, 20...Slab guide roll (upper),
21... Slab guide roll (lower), 22... Clamp device, 23... Traveling frame, 24... Traveling drive device, 25... Coiler, 26... Hot water pot (tundish), 27... Molten metal.

Claims (1)

[Claims] 1. In a hot sheet manufacturing facility consisting of multiple rows of continuous casting lines and one row of rolling lines for rolling the slabs cast by the continuous casting lines, between the continuous casting line and the rolling line, A turning roll supported by a turning frame rotatable on a turning frame and a tiltable upper and lower part 1 following the turning roll.
A slab direction changing device is provided, which comprises a looper roll consisting of a pair of rolls, and a slab guide roll consisting of a pair of upper and lower rolls that can be clamped and can be driven to run in the width direction of the slab. Hot thin plate manufacturing equipment, characterized in that a continuous casting line is disposed radially at a predetermined angle with respect to the direction changing device.