JPH06179052A - Method for continuously casting strip and device therefor - Google Patents

Abstract

PURPOSE:To reduce a strip passing work with a dummy bar and to shorten casting preparing time by remaining the last end of a cast strip cast at the last of a lot in a length having a range from a shear to a welder and using it remaining last end as the dummy bar for a following lot. CONSTITUTION:This device is constituted of a caster 3, the welder 6, the shear 7 and coiling mechanism 9, etc. The last end of the cast strip cast at the last of the lot is left in the length having the range from the shear 7 to the welder 6 and used to the dummy bar 5 for the following lot. The welder 6 is provided just near the caster 3 so that the using range of the steel strip-made dummy bar 8 becomes as little as possible. Thus, the strip passing work with the dummy bar is reduced and the casting preparing time is shortened, and the manufacturing cost of the dummy bar is reduced. Further, the cast strip cast at the last of the lot is not good product because inclusion remains in the inner part of the cast strip, and this part can effectively be utilized as the dummy bar.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting method for thin metal sheets and equipment therefor, and mainly to a dummy bar prepared at the start of casting.

[0002]

2. Description of the Related Art In the conventional continuous casting method for thin plates,
Before the start of casting, a dummy bar made of steel plate having a thickness and width smaller than the thickness and width of the cast piece to be guided is provided throughout the continuous casting equipment from the continuous casting machine to the winder. , Wind the tip of the dummy bar around the winder. When the casting is started, the dummy bar is first wound by the winder, and subsequently, the thin plate slab that is joined to the rear end side of the dummy bar and is cast by the continuous casting facility is wound. As a conventional method for continuously casting the thin plate and a dummy bar, for example, as disclosed in JP-A-63-224847, a method of joining the dummy bar at the inlet of the continuous casting machine immediately before the start of casting is disclosed. There is.

[0003]

However, the continuous casting equipment for casting thin plate cast pieces comprises a large 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 winder. Therefore, the distance from the casting machine to the winding machine is very long, and in some cases, the length between them is about 50 to 70 m. Although it is necessary to prepare the dummy bar during this period, the conventional dummy bar method has problems such as a long preparation time for casting and an increase in the manufacturing cost of the dummy bar.

The present invention is to greatly shorten the casting interval by using the final end of the thin plate cast piece cast at the end of a lot for most of the dummy bars of the next lot.

[0005]

Means for Solving the Problems The gist of the present invention for solving the above-mentioned problems is as follows. (1) In a method for operating a thin plate continuous casting facility including a continuous casting machine, a welding device, a shear, a winder A continuous casting method for a thin plate, characterized in that the final end of the thin plate cast piece cast at the end of a lot is left as a dummy bar for the next lot by leaving a length in the range of the shear to the welding device. This is a continuous casting equipment for thin plates, which is equipped with a welding device in the immediate vicinity of the casting machine so that the range of use of the dummy bar is minimized.

[0006]

[Action]

(1) In the continuous casting equipment for thin plates, by using the final end of the cast thin plate slab for most of the dummy bar, the plate threading work by the dummy bar is significantly reduced.
As a result, it becomes possible to significantly reduce the casting preparation time. (2) The front end of the dummy bar made of steel plate and the rear end of the dummy bar of the thin plate slab are joined by a welding machine in a vertically stacked state, and the dummy bar is arranged from the casting machine to the winding machine. As a result, 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 now be described in detail with reference to the drawings. FIG. 1 is a central longitudinal sectional view of a continuous casting facility which is an embodiment of the present invention.
Shows the 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 winding machine 9, that is, the continuous casting operation is in progress.

FIG. 2 shows a state in which all of the molten metal 2 has disappeared from the tundish 1 and casting is completed. The rear end of the final end of the thin plate slab to be the dummy bar 5 of the cast thin plate slab 4 is shown in FIG. It shows a state in which the plasma welding machine is stopped at 6 parts and the shearing is performed, that is, the configuration of the present invention. There are various methods for connecting 13 between the tip end of the dummy bar 8 made of steel plate and the rear end of the dummy bar 5 made of thin plate slab. As an example, there is plasma welding, and the tip end of the dummy bar 8 made of steel plate and the thin plate By stacking the rear ends of the dummy bars 5 of the slab on top of each other and welding from the upper surface in the plate width direction, it is possible to easily join in a short time. In addition, since the vicinity of this connecting portion is cut and removed by a shear arranged immediately before the winding machine, it is sufficient that the welding tensile strength is sufficient to withstand the tension generated during winding.

In FIG. 3, a dummy bar 8 made of a steel plate is used for the casting machine 3
And the plasma welding machine 6 are arranged, and the plasma welding machine 6 welds the front end of the dummy bar 8 made of steel plate and the rear end of the dummy bar 5 of thin-plate slab in the plate width direction from the upper surface thereof which is vertically overlapped. It is in a state of being. FIG. 4 shows a state in which the tip portion of the dummy bar 8 made of a steel plate and the joint portion 13 of the rear end portion of the dummy bar 5 made of a thin plate slab are cut and removed by the shear 7 during the running.

FIG. 5 shows a joint portion 13 between the tip of the dummy bar 8 made of a steel plate and the rear end of the dummy bar 5 made of a cast thin plate. The tip end of the dummy bar 8 made of a steel plate and the dummy bar made of the cast thin plate are shown. 5 shows a welded portion welded by the plasma welder 6 with the shape of the rear end portion of No. 5 unchanged.

[0011]

In summary, according to the present invention, the following excellent effects can be obtained. (1) By using the final end of the thin plate slab cast at the end of the lot for most of the dummy bar, the plate passing operation by the dummy bar is significantly reduced. Therefore, the casting preparation time can be significantly shortened. (2) A long dummy bar is formed by joining the front end of the steel bar dummy bar and the rear end of the thin plate cast dummy bar with a welding machine and placing the dummy bar from the casting machine to the winder. The manufacturing cost of the dummy bar can be significantly reduced without the need. (3) The thin plate cast cast at the end of the lot does not become a product because inclusions remain inside the cast, and this part can be effectively used as a dummy bar.

[Brief description of drawings]

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

FIG. 2 shows a state in which casting has been completed. Of the cast thin plate cast, the rear end of the cast thin plate cast at the final end that serves as a dummy bar stops at the welder section and is divided by the shear. It is a figure which shows the state which performed.

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

FIG. 4 is a view showing a state in which a joining portion between a front end portion of a dummy bar made of a steel plate and a rear end portion of a dummy bar of a thin plate slab is cut and removed by a shear while running.

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

[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 ... Steel plate dummy bar 9 ... Winding machine 10 ... Heating device 11 ... Cooling device 12 ... Joined part (steel plate dummy bar and thin plate cast piece) 13 ... Joined part (plasma welding)

Front page continuation (72) Inventor Katsumi Fujino 59 Nippon Steel Plant Design Co., Ltd., 46 Nakahara, Tobata-ku, Kitakyushu, Fukuoka

Claims (2)

[Claims] 1. A method of operating a thin plate continuous casting facility comprising a continuous casting machine, a welding device, a shearing device, a winding device, etc., wherein the final end of the thin plate cast piece cast at the end of the lot ranges from the shearing device to the welding device. The continuous casting method for thin plates, which is used as a dummy bar for the next lot. 2. A welding device for connecting the final end of the finally cast thin plate slab of claim 1 and a steel plate dummy bar for starting the next casting is provided in the immediate vicinity of the continuous casting machine. A continuous casting equipment for thin plates.