JP2977398B2 - Continuous casting method of thin plate and its equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for continuously casting thin metal sheets, and more particularly to a dummy bar prepared at the start of casting.

[0002]

2. Description of the Related Art In a conventional continuous casting method for a thin plate,
Before the start of casting, as a slab guide, a steel plate dummy bar having a thickness and width smaller than the thickness and width of the slab to be cast is provided throughout the continuous casting equipment from the continuous caster to the winding machine. Then, wind the leading end side of the dummy bar around the winder. At the start of casting, a winder winds a dummy bar first, and then winds a thin plate slab that is joined to the rear end of the dummy bar and cast from a continuous casting facility. As a conventional technique relating to the continuous casting method of the thin plate and the dummy bar, for example, as disclosed in Japanese Patent Application Laid-Open No. 63-224847, a method is disclosed in which a dummy bar is joined at the inlet of a continuous casting machine immediately before the start of casting. I have.

[0003]

However, the continuous casting equipment for casting thin slabs comprises a number of devices such as a casting machine, a heating device, a looper, a rolling mill, a leveler, a cooling device, a shear, and a winding machine. Therefore, the distance from the casting machine to the winder is very long, and in some cases, the length between them is about 50 to 70 m. During this time, it is necessary to prepare a dummy bar. However, in the conventional dummy bar method, since a long time is required for the plate passing operation, there are problems such as a long casting preparation time and an increase in dummy bar manufacturing cost.

An object of the present invention is to greatly reduce the casting interval by using the final end of a thin plate slab cast at the end of a lot for most of the dummy bars of the next lot.

[0005]

The gist of the present invention for solving the above-mentioned problems is as follows: (1) A method of operating a continuous sheet casting facility comprising a continuous casting machine, a welding device, a shear, a winding machine, and the like. A continuous casting method for a thin sheet, characterized in that the final end of the sheet slab cast at the end of the lot is left in a range from the shear to the welding device and used as a dummy bar for the next lot. This is a continuous casting machine for thin sheets, characterized in that a welding device is provided in the immediate vicinity of the casting machine so that the use range of the dummy bar is reduced as much as possible.

[0006]

[Action]

(1) In the continuous casting equipment for thin plates, by using the final end of the cast thin plate for most of the dummy bars, the work of passing through the dummy bars is greatly reduced.
As a result, the casting preparation time can be greatly reduced. (2) The tip of the dummy bar made of steel sheet and the rear end of the dummy bar made of thin slab are joined with a welding machine in a state where they are vertically stacked, and the dummy bar is arranged from the casting machine to the winding machine. Accordingly, a long dummy bar is not required, and the manufacturing cost of the dummy bar can be significantly reduced.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a central longitudinal sectional view of a continuous casting facility according to an embodiment of the present invention.
Shows a state in which the thin plate slab 4 is cast by the casting machine 3 and the thin plate slab 4 is wound by the winder 9, that is, the continuous casting operation is being performed.

FIG. 2 shows a state in which all the molten metal 2 has been removed from the tundish 1 and the casting has been completed. The rear end of the final end of the thin plate slab which becomes the inner dummy bar 5 of the cast thin plate slab 4 is shown in FIG. This shows a state in which the plasma welding machine is stopped at the section 6 and divided by the shear 7, that is, the configuration of the present invention. The connection 13 between the distal end of the steel-made dummy bar 8 and the rear end of the thin-plate slab dummy bar 5 can be made by various methods. For example, plasma welding is used. By joining the rear ends of the cast bar dummy bars 5 vertically and welding them from the upper surface in the plate width direction, the joining can be easily performed in a short time. In addition, since the vicinity of this connection portion is cut and removed by a shear disposed immediately before the winding machine, it is sufficient that the connection has a welding tensile strength enough to withstand the tension generated at the time of winding.

FIG. 3 shows a case where a dummy bar 8 made of a steel plate is
And the plasma welding machine 6, and the plasma welding machine 6 welds the tip of the dummy bar 8 made of a steel plate and the rear end of the dummy bar 5 made of a thin sheet slab in the width direction of the plate from the upper surface thereof. It is in the state that it is. FIG. 4 shows a state in which the joint portion 13 between the front end portion of the dummy bar 8 made of a steel plate and the rear end portion of the dummy bar 5 made of a thin plate is cut and removed by the shear 7 during running.

FIG. 5 shows a joint portion 13 between the front end of the dummy bar 8 made of steel plate and the rear end of the dummy bar 5 made of thin plate slab. 5 represents a welded portion welded by the plasma welder 6 while keeping the shape of the rear end portion as it is.

[0011]

In summary, according to the present invention, the following excellent effects can be obtained. (1) By using the last end of the thin plate slab cast at the end of the lot for most of the dummy bar, the work of passing through the dummy bar by the bar is greatly reduced. For this reason, the casting preparation time can be significantly reduced. (2) The distal end of the dummy bar made of a steel plate and the rear end of the dummy bar made of a thin sheet slab are joined by a welding machine, and the dummy bar is arranged from the casting machine to the winding machine. The manufacturing cost of the dummy bar can be significantly reduced without requiring it. (3) The thin plate slab cast at the end of the lot does not become a product because inclusions remain inside the slab, and this portion can be effectively used as a dummy bar.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view of a continuous casting facility, showing a state in which molten metal is poured from a tundish into a casting machine, thin slabs are cast from the casting machine, and a thin slab is wound by a winder. FIG.

FIG. 2 shows a state in which casting has been completed. Among the cast thin-plate slabs, a rear end portion of a thin-plate slab cast at a final end serving as a dummy bar is stopped at a welding machine, and divided by a shear. It is a figure which shows the state which performed.

FIG. 3 is a view showing a state in which a front end portion of a steel plate dummy bar and a rear end portion of a thin plate cast dummy bar are vertically overlapped and welded.

FIG. 4 is a view showing a state in which a joint between a front end portion of a steel plate dummy bar and a rear end portion of a thin plate cast dummy bar is cut and removed by a shear during a run.

FIG. 5 is a view showing a joint portion between a front end portion of a dummy bar made of a steel plate and a rear end portion of a dummy bar made of a thin plate slab.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tundish 2 ... Molten metal 3 ... Casting machine 4 ... Thin plate slab 5 ... Dummy bar (thin plate slab) 6 ... Plasma welding machine 7 ... Shear 8 ... Dummy bar made of steel plate 9 ... Winding machine 10 ... Heating device 11 ... Cooling device 12 ... Joint (dummy bar made of steel plate and thin plate slab) 13 ... Joint (plasma welding)

────────────────────────────────────────────────── ─── Continued from the front page (72) Katsumi Fujino, Nippon Steel Plant Design Co., Ltd. at 46, Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Prefecture (56) References JP-A-56-105850 (JP, A) 50-98431 (JP, A) JP 46-23824 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B22D 11/06 330 B22D 11/08

Claims (2)

(57) [Claims] 1. A method for operating a continuous sheet casting facility comprising a continuous casting machine, a welding device, a shear, a winding machine, and the like, wherein a final end of a thin plate slab cast at the end of a lot is moved from a shear to a welding device. A continuous casting method for a thin plate, wherein the length is left as a dummy bar for a next lot. 2. A welding device for connecting a final end of the thin cast slab finally cast according to claim 1 and a steel plate dummy bar for starting the next casting is provided immediately adjacent to the continuous casting machine. A continuous casting facility for thin sheets, characterized by the following.