JPS6021161A - Continuous casting device for thin plate - Google Patents

Abstract

PURPOSE:To obtain a thin metallic plate having a good surface characteristic with a titled device which has a pair of water-cooled casting rolls in a molten metal bath by providing heated refractory material near the part where the surface of the molten metal and said rolls contact. CONSTITUTION:A molten steel 10 is supplied into a tundish 1 and is continuously poured via pouring nozzle 2 into a molten metal dam 4 by a specified amt. The molten steel is reserved in the part enclosed of casting rolls 3, 3' and the dam 4. The molten steel 11 contacts the surfaces of the rolls 3, 3', by which the molten steel is cooled and solidified shells 12, 12' are formed. The sheels move downward according to revolutions 16, 16' of rolls, by which a sheet of a thin plate 13 is manufacture. Heated refractory materials 6, 6' contg. heating elements such as nichrome wires or the like are installed near the part where the surface of the steel 11 and the rolls 3, 3' contact so that the shells 12, 12' start solidification from below the surface of the molten steel 11. The surface of the plate 13 is thus kept free from the influence by the waving on the surface of the molten steel and the surface characteristic of the plate 13 is improved.

Description

[Detailed description of the invention] [Technical field of the present invention] The present invention relates to a continuous thin plate casting apparatus for metal, steel, etc.

[Conventional thin plate continuous casting method 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 comes into contact with the surface of the water-cooled casting rolls. It has been known to continuously cast thin metal sheets by cooling them to form solidified shells. However, the surface texture of the metal sheet cast by this conventional method has a drawback that it has large irregularities and remains as scratches even after rolling.

[Object of the present invention]

The present inventors discovered that since the surface quality of a thin metal sheet is strongly influenced by the surface of the molten metal, by starting solidification from a little below the surface of the molten metal, the influence of the surface can be avoided and the surface quality can be improved. They discovered that a thin metal plate could be obtained and completed the present invention. Therefore, an object of the present invention is to provide a thin sheet continuous casting apparatus in which thin metal sheets have good surface properties. More specifically, it is an object of the present invention to provide a continuous thin plate casting apparatus in which solidification of molten metal starts from slightly below the surface.

[Configuration of the present invention]

In order to achieve the above object, the present invention resides in disposing a heating refractory material near the contact surface between the surface of the molten metal in the molten metal bath and the water-cooled casting roll. That is, the present invention provides a continuous thin plate casting apparatus having a pair of water-cooled casting rolls in a molten metal bath, in which a heated refractory material is disposed near the contact surface between the surface of the molten metal in the molten metal bath and the water-cooled casting rolls. This is a thin plate continuous casting machine characterized by the following.

In the present invention, the heating surface 1 member is placed near the contact between the surface of the molten metal and the water-cooled casting roll, so that the solidification start point of the solidification shell formed on the surface of the water-cooled casting roll is adjusted to It is positioned further down so that it is not affected by the surface of the molten metal at all.

In the present invention, the term "heated refractory material" means a heated refractory material, and it is preferable to incorporate a heating element such as a nichrome wire into this receptacle.

In fact, since the refractory material used in the present invention is heated as described above, no solidified shell is formed on the surface of the refractory material, and damage to the refractory material is prevented.

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 described in more detail below based on the accompanying drawings. FIG. 1 is a cross-sectional view of a top-pouring continuous thin plate casting apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. The direct rolling type continuous casting equipment shown in Figures 1 and 2 is the Dan Push 1
, two water-cooled casting rolls 3 and 5', a molten steel dam (side dam) 4, and a guide roll 5. The tundish 1 is an intermediate container lined with a refractory material and has a tap water nozzle 2 at its bottom. The casting rolls 6.3' have an internal water-cooled structure, are set to face each other with a gap equal to the thickness (T) of the thin plate 15 to be manufactured, and are rotatable synchronously in opposite directions 16 and 16'. There is.

The molten steel dam 4 is made of a fire-resistant and heat-insulating material, and is installed at both ends of the casting rolls 3, 3'.
It is sealed so that the molten steel 11 collected in between does not leak out from both sides. Also, the guide roll 5 is the manufactured thin plate 1
Guide 3.

The molten steel 10 is supplied to the tundish 1 and the tap nozzle 2
The molten steel is continuously injected into the molten steel dam (side dam) 4 in a fixed amount through the molten steel dam (side dam). Molten steel 1 collected in the area surrounded by two casting rolls 6.3' and molten steel dam (side dam) 4
1 are cooled by contacting the surfaces of water-cooled casting rolls 3 and 3', solidified shells 12 and 12' are formed, respectively, and move downward as the casting rolls 6 and 3' rotate 16 and 16',
The two solidified shells 12, 12' are rolled together and rolled.
Two thin plates 15 are manufactured. The above is the same as the conventional means, but in the present invention, heating refractory materials 6, 6' containing heating elements such as nichrome wire are placed near the contact between the surface of the molten steel 11 and the water-cooled casting rolls 3, 6'. Install and solidify shell 12
, 12' starts solidifying from below the surface of the melt/A11.

By starting solidification of the solidified shells 12 and 12' from below the surface of the molten steel 11, the influence of undulations on the surface of the molten steel 11 is prevented from appearing on the surface of the thin metal sheet, and the surface quality of the thin metal sheet is improved.

Further, the heated refractory materials 6, 6' form solidified shells on the refractory materials 6, 6', and the solidified shells 12 of the water-cooled casting rolls 5, 3'.
12', the refractory materials 6, 6' are heated to prevent the formation of solidified shells in order to prevent damage to the refractory materials 6, 6'.

FIG. 3 is a cross-sectional view of a bottom-pouring continuous thin plate casting apparatus according to another embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along the line ■--■ in FIG. In FIGS. 3 and 4, the molten steel 11 in the molten steel dam 4 is cooled by contacting the surfaces of the water-cooled casting rolls 3 and 3', and solidified shells 12 and 12' are formed on each of the rolls 3 and 3'. and the rotation 1 of these rolls 5, 6'
6°16', the solidified shell 1 of the two plates moves upward.
2, 12' are rolled together and one sheet 16 is produced facing upwards, but is the same as in FIGS. 1 and 2. That is, in Figures 6 and 4, the first
Molten steel 11 is heated by heating refractory materials 6 and 6' in the same way as shown in Figures and Figure 2.
The solidified shells 12, 12' begin to form from below the surface.

[Effects of the present invention]

As described in detail above, the present invention has a heated refractory material disposed near the contact surface between the surface of the molten metal in the molten metal bath and the water-cooled casting roll, so that the molten metal bath is heated by the heated refractory material. The starting point of the solidified shell of the water-cooled casting roll is below the surface of the molten metal, and is not affected by the undulations on the surface of the molten steel 110. As a result, the unevenness of the metal thin plate can be reduced and a metal thin plate with good surface properties can be obtained. In addition, by obtaining a smooth metal sheet surface, surface cracking can be prevented, and furthermore, since the solidification length can be made constant, stable operation can be achieved, which is a remarkable effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a top-pouring continuous thin plate casting apparatus according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line U-YU of FIG. 1. FIG. 5 is a sectional view of a bottom pouring type continuous thin plate casting apparatus which is another embodiment of the present invention, and FIG.
It is a sectional view taken along the line ■-■ in the figure. 1: Tambutsu 2: Pouring nozzle, 5' pair of water-cooled casting rolls 4: Molten steel dam (side dam) 5 Guide roll 6.6
': Heated refractory material 10: Molten steel in the tambutsu V11: Molten steel in the molten steel dam 12.12': Solidified shell formed on the water-cooled casting roll 15: Thin plate 14: Drawing 16.16': Rotating agent of the water-cooled casting roll Number of people 1) Meifuku agent Ryo Hagiwara -

Claims (1)

[Claims] A continuous thin plate casting apparatus having a pair of water-cooled casting rolls in a molten metal bath, characterized in that a heating refractory material is disposed near the contact surface between the surface of the molten metal in the molten metal bath and the water-cooled casting rolls. Continuous thin plate casting equipment.