JPS6040648A - Continuous casting device for thin sheet - Google Patents

Abstract

PURPOSE:To prevent formation of a solidified shell on the inside of side dams in the stage of supplying a molten metal between water-cooled rolls and casting continuously a thin sheet by providing a recess on the inside of each side dam and pouring a molten metal via a pouring nozzle into the recesses. CONSTITUTION:A molten steel 11 reserved in the part enclosed of water-cooled casting rolls 3, 3' and side dams 4 of a continuous casting device for a thin sheet is cooled by contacting with the surface of the rolls 3, 3'. Solidified shells 12, 12' formed upon such cooling and joined and rolled to a thin sheet 13 as the rolls 3, 3' revolve 16, 16'. A recess 4c is provided to the inside of the refractory material 4a of each side dam 4 consisting of said material 4a and heat insulating material 4b. The molten steel 11 is poured via a pouring nozzle into the recess to supply quantity of heat to the material 4a and the molten steel near the dam 4. The inside surface of the side dam is thus prevented from being formed with the solidified shell and the thin sheet is produced stably.

Description

[Detailed description of the invention] [Technical field of the present invention] INDUSTRIAL APPLICATION This invention is bolted to the thin plate continuous casting apparatus of metal, steel, etc.

[Conventional thin plate continuous casting equipment and its drawbacks] Molten metal is supplied between a pair of water-cooled casting rolls that face each other and are driven and rotated synchronously in opposite directions, and the molten metal is transferred to the surface of the water-cooled casting rolls. BACKGROUND OF THE INVENTION Apparatus for continuously casting sheet metal by contact cooling to form a solidified shell are known from the prior art. In this conventional apparatus, as shown in FIG. 1, side dams 4.4 are provided to prevent molten metal from leaking axially outward from a pair of water-cooled casting rolls. And is a solidified shell formed on the inner surface of this side dam 4°4? In order to prevent this, nozzles 2, 2 for pouring molten metal are arranged near the inside of the side dams 4, 4. The heat of the molten metal poured from the nozzles 2, 2 is transferred to the molten metal existing near the inside of the side dams 4, 4 and the side dam 4.
, 4, thereby preventing the formation of a solidified shell on the inner surfaces of the side dams 4, 4. However, there is a drawback that simply pouring molten metal near the insides of the side dams 4 cannot sufficiently prevent the formation of solidified shells on the inside surfaces of the side dams.

[Object of the present invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a continuous thin plate casting apparatus that eliminates the drawbacks of the conventional apparatus described above. That is, an object of the present invention is to provide a thin plate continuous casting apparatus that sufficiently prevents the formation of a solidified shell on the inner surface of a suid dam.

[Configuration of the present invention]

According to the present invention, a recess is provided in the side dam as a means for achieving the above object.

That is, the present invention provides a thin plate continuous casting apparatus consisting of a pair of water-cooled four-end rolls in which a nozzle for pouring molten metal is disposed near the inside of a side dam, in which a hole is provided in the side dam, and a hole is formed in the side dam. The present invention relates to a continuous thin plate casting apparatus characterized in that molten metal is poured into the thin plate.

The present invention is an apparatus in which a nozzle for pouring molten metal is disposed near the inside of a side dam, in which most of the wall surface of the side dam is hollowed out to provide a recess. Molten metal is poured into the recess, and the recess becomes a puddle. In addition, more heat from the poured molten metal is transferred to the side dam than in the conventional method, which effectively prevents the formation of a solidified shell on the inner surface of the side dam. It can be prevented. In addition, the wall of the side dam is cut out and a hole is installed on the inside surface of the side dam.
By making it smaller, it is possible to reliably prevent the formation of a coagulated shell on the inner surface of the side dam.

Furthermore, in the present invention, molten metal means metal in a broad sense, and also includes molten steel.

Although the present invention has been described in detail above, the present invention will be explained in more detail below based on FIGS. 2 to 4.

Fig. 2 is an overall side sectional view of a continuous thin plate casting apparatus which is an embodiment of the present invention, Fig. 3 is an enlarged view of the main part of Fig. 2, and Fig. 4 is a cross-sectional view taken from Fig. 3 m-m. It is a sectional view taken along the arrow line.

In Fig. 2, a direct rolling continuous casting device consists of a tongue pusher 1, two water-cooled casting rolls 6°3', and a molten steel dam (
It consists of a side dam) 4, a guide roll 5, and a pinch roll 6. The tank pusher 1 is an intermediate container lined with a refractory material, and has a hot water tap nozzle 2 at its bottom.

, the casting rolls 3 and 3' have an internal water-cooled structure, are installed facing each other with a gap equal to the thickness (T) of the thin plate to be manufactured, and rotate synchronously in opposite directions 16 and 16'. It is possible. The molten steel dam 4 is manufactured with a fireproof insulation + 1' rate, and is installed at both ends of the casting roll 3.3'.
Seal to prevent leakage from both 11tt and 1 directions.

In addition, 5 guide rolls are manufactured to guide the P plate 13,
Is the pinch roll 6 driven synchronously with the casting rolls 3 and 3'? W
The plate 13 is pulled out at a predetermined speed.

The molten steel is supplied to a 10-k tank push 1, and is injected into a molten steel dam (side dam) 4 at a constant rate via a tapping nozzle 2. The molten steel 11 collected in the area surrounded by the two casting rolls 3, 6' and the molten steel dam (side dam) 4 is cooled by contacting the surfaces of the water-cooled casting rolls 3, 3', and forms hard shells 12 and 12, respectively. ' has finished forming,
As the casting rolls 3, 3' rotate 16, 16', they move downward, and the two solidified shells 12, 12' are rolled together to produce one sheet 13.

In this case, when a solidified shell is formed on the inner surface of the molten steel dam (side dam) 4, a solidified shell having a substantially conical cross section is formed, making rolling and drawing 14 of the solidified shell 12° 12' impossible.

Therefore, in the present invention, in a molten steel dam (side dam) 4 composed of a refractory material 4a and a heat insulating material 4b, as shown in FIGS. 3 and 4, a corner 4c of the dam refractory material 4a is Molten steel 11 is poured into the tank. By pouring the molten steel 11 one after another into the corner 4c of the molten steel dam (side dam) 4 in this way, heat is supplied to the dam refractory material 4a and the molten steel near the side dam 4, and the side dam 4 is heated. The formation of a coagulated shell on the inner surface can be prevented.

[Effects of the present invention] As described in detail above, the present invention provides a notch in the side dam so that molten metal can be poured into this indentation, so that it is possible to prevent the formation of a solidified shell on the inner surface of the side dam. This has the effect of sufficiently preventing this. As a result, because of the solidified shell formed on the inner surface of the side dam, stable casting can be performed without making rolling or drawing impossible, making it possible to perform direct rolling continuous casting, which was previously very difficult. This brings about the remarkable effect that it is possible to manufacture thin plates by.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a pair of water-cooled casting rolls of a conventional apparatus, cut in the direction of the grain. FIG. 2 is an overall side sectional view of a thin plate continuous casting apparatus according to an embodiment of the present invention, FIG. 3 is an enlarged view of the main part of FIG. 2, and FIG. 4 is an ut-t
It is an n-line sectional view. 1: Tambutsu, 2: Pouring nozzle, 5. 5' Pair of water-cooled casting rolls, 4: Molten steel dam (side dam), 4a
: Molten steel dam refractory material, 4b; Molten copper dam insulation material, 4C: Molten steel dam depression, 5 Ni guide roll, 6: Vinci roll, 1
0: Molten steel in Dandenyu tL11: Molten steel in molten steel dam,
12: Solidified shell formed on water-cooled casting roll, 13:
Thin plate, 14: Drawing, 16.16”: Rotating agent for water-cooled casting rolls 1) Meifu agent Ryo Hagiwara -

Claims (1)

[Claims] In a thin plate continuous casting device consisting of a pair of water-cooled casting rolls each having a nozzle for pouring molten metal near the inside of a side dam, a recess is provided in the side dam so that the molten metal is poured into the recess. Continuous thin plate casting equipment featuring: