JPS629754A - Twin roll type continuous casting machine - Google Patents

Abstract

PURPOSE:To prevent the generation of breakdown of a thin sheet by the solidified shell which grows by providing a molten metal pail apart from the peripheral surfaces of rolls above the rolls and pouring a molten metal to the space between the rolls from the nozzle in the bottom of the molten metal pail below the top surfaces of the rolls. CONSTITUTION:Side seals 4 are positioned to contact with both ends of the rolls R1, R2 and the molten metal pail 5 is provided in such a manner that the pail is apart upward from the rolls R1, R2 along the peripheral surfaces thereof and that the bottom extends downward from the virtual horizontal plane H in contact with the top surfaces of the rolls R1, R2. Plural nozzles 6 for pouring the molten metal M1 into a molten pool are provided to the pail 5. The rolls R1, R2 constituted in the above-mentioned manner are rotated oppositely from each other in arrow A, B directions and the molten metal M1 is poured from the nozzles 6 of the pail 5 onto the peripheral surfaces of the rolls. Then the molten metal of which the wall surfaces consist of only the peripheral surfaces of the rolls R1m R2 dams up the metal M1 without generating triple point in the longitudinal direction of the rolls R1, R2. The generation of the breakdown in the thin sheet M3 by the solidified shell M2 which grows is thus obviated.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is equipped with a pair of rolls that are positioned horizontally and rotate in opposite directions, and molten metal is poured between the rolls from above. The present invention relates to a twin-roll type continuous casting machine that continuously casts a thin plate by rolling the molten metal while cooling and solidifying it between rolls.

[Prior Art] This type of continuous casting machine is equipped with a pair of rolls R1°R, which rotate in opposite directions A and B, as shown in FIG. The molten metal M is poured into the molten metal boule P between them from a nozzle of a tundish located above, not shown, and is gradually cooled and solidified on the circumferential surfaces of the rolls R, , R, and then solidified shell M,
is rolled between rolls Rl and R to continuously cast a thin plate M3.

Conventionally, in order to form the molten metal pool P, as shown in FIG. The rollers are provided with seals 3 whose lower ends are in contact with the circumferential surfaces of the rolls R1 and Rt.

Then, a molten metal pool P is formed in the area surrounded by these side seals 2 and seals 3, and the surface of the molten metal M1 in the molten metal pool P reaches the rolls R, , R.
It is located above the top surface of 2.

[Problems to be Solved by the Invention] In the conventional continuous casting machine described above, the lower end of the seal 3 forming the molten metal pool P and the rolls R, .

Point C (hereinafter referred to as 13 points) where the peripheral surface of and the molten metal M contact
) exists for a long time along the longitudinal direction of the rolls R,,R,. This triple point C causes the following problems. In other words, the molten metal M almost stops at the triple point C.
There was a problem in that the solidified shell of No. 1 grew and entered the thin plate M3, and the solidified shell acted as a resistance to pull both ends of the thin plate M, causing the thin plate M3 to break. . In addition, there was a problem in that the molten metal M1 had a biased flow within the relatively thick molten metal pool P, which hindered the smooth flow of the molten metal M.

[Means for Solving the Problems] The twin-roll continuous casting machine according to the present invention is equipped with a pair of rolls that rotate in opposite directions, and pours molten metal between the rolls from above. In a twin-roll continuous casting machine that continuously casts a thin plate by rolling the molten metal while cooling and solidifying it between rolls, side seals that partition the space between the rolls on both the left and right sides, and the circumferential surface of each roll are used. A molten metal pool is formed between the rolls, and a molten metal bucket into which the molten metal is poured is placed above the rolls at a distance from the circumferential surface of each roll, and below an imaginary horizontal plane touching the top surface of one of the rolls. Extend the bottom of the molten metal pail to
The molten metal bucket is characterized in that a nozzle is provided at the bottom of the molten metal bucket to pour the molten metal in the molten metal bucket between the rolls.

[Function] The twin-roll continuous casting machine of the present invention has a molten metal pail located below an imaginary horizontal plane in contact with the top surface of each roll, in a molten metal pool formed without creating triple points in the longitudinal direction of the rolls. By pouring the molten metal from a nozzle at the bottom, the occurrence of plate breakage due to the presence of triple points is avoided, and the molten metal is prevented from drifting in the molten metal pool to make the flow smooth.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4.

1 to 3 show an embodiment of the present invention. In this embodiment, a molten metal pool P is formed in a portion surrounded by side seals 4 that cover both ends of rolls R, R, and the peripheral surfaces of rolls R+ and Rt. The side seals 4 are provided at fixed positions so as to contact both ends of the rolls R, , R,. The molten metal boule P is equipped with a molten metal bucket 5 into which the molten metal M1 is poured.

This molten metal bucket 5 is spaced apart upwardly along the circumferential surface of each roll RI, Rt, and its bottom is connected to the roll Rr.
, Rt, and extends below the virtual horizontal plane H that is in contact with the upper surface of Rt. The bottom of this molten metal pail 5 has rolls Rl, R
It has a shape that follows the circumferential surface of 2 (see Figure 1).
. The molten metal M1 in the molten metal bucket 5 is placed at the bottom of the molten metal bucket 5.
A plurality of nozzles 6 are provided for pouring out the molten metal into the molten metal pool P.

Next, the effect will be explained.

The rolls Rl and Rt rotate in directions of arrows A and B opposite to each other, and gradually cool and solidify the molten metal M in the molten metal boule P on their circumferential surfaces, and form a solidified shell M thereof.

is rolled to continuously cast thin plate M3. The molten metal M1 in the molten metal bucket 5 is continuously supplied into the molten metal pool P from the nozzle 6. The molten metal surface in the molten metal pool P is kept below the virtual horizontal plane H that is in contact with the upper surfaces of the rolls R4 and Rt. Therefore, the molten metal pool P has rolls Rl,
In the axial direction of R, only the peripheral surfaces of the rolls R, , R are used as wall surfaces to hold back the molten metal M. therefore,
In the longitudinal direction of the rolls R1 and R7, there is no triple point as described above, and there is a problem due to the presence of the triple point, that is, a temporary break in the thin plate M3 is caused by the solidified shell that grows at the triple point. be avoided in advance.

By the way, the molten metal tub 5 in the molten metal pool P suppresses the drift of the molten metal M in the molten metal pool P by its own existence. In addition, the molten metal bucket 5 has a bottom portion and a roll R,
The storage space for the molten metal M1 in the molten metal pool P is shaped along the circumferential surface of the roll RI, R2 between the circumferential surface of the roll R, and the flow direction of the molten metal M is set to be the direction of the flow of the roll R+.
, Rt in the rotational direction. As a result of these, molten metal M.

The flow becomes smooth.

FIG. 4 shows another example of the configuration of the side seal 4 in the continuous casting machine of the present invention. In this example, the side seal 4
are provided so as to close the space between the left and right end faces of the rolls Rl and R2. A molten metal bucket 5 is located between these left and right side seals 4, and the left and right walls of the molten metal bucket 5 in the figure are in contact with the circumferential surfaces of the rolls R3 and Rt to dam the molten metal M. It has become. therefore,
The side seals 4 in this example are provided as a safety measure to prevent the molten metal M from flowing out if it is not dammed up by the left and right walls of the molten metal bucket 5. Therefore, by changing the size of the molten metal bucket 5,
Thin plate M3 according to the size of the molten metal bucket 5 in the left and right direction in the figure.
You can change the width without any problem.

[Effects of the Invention] As explained above, the twin-roll continuous casting machine according to the present invention forms a molten metal pool by the side seal and the circumferential surface of the roll, and in the molten metal pool, there is a virtual Since the molten metal is poured from the nozzle at the bottom of the molten metal pail located below the horizontal plane of the roll, it is possible to form a molten metal pool without creating a triple point in the longitudinal direction of the roll. It is possible to prevent the occurrence of board breakage. Further, the molten metal bucket existing in the molten metal pool can prevent the molten metal from drifting and make the flow smooth.

[Brief explanation of the drawing]

FIGS. 1 to 3 represent one embodiment of the present invention.
The figure is a cross-sectional view, the second figure is a plan view, and the third figure is the [-
FIG. 4 is a plan view showing another configuration example of the side seal according to the present invention, and FIG. 5 is a cross-sectional view of a conventional continuous casting machine. 4... Side seal, 5... Molten metal bucket, 6... Nozzle, R,, R,...
・Roll, Ml... Molten metal, M,...
...solidified shell, M3...thin plate, H...
horizontal plane. Applicant Ishikawajima Harima Heavy Industries Co., Ltd. Figure 1 Figure 2 I Figure 3 r

Claims (1)

[Claims] It is equipped with a pair of rolls that rotate in opposite directions, and pours molten metal from above between the rolls. The molten metal is then cooled and solidified between the rolls and rolled to continuously cast a thin plate. In a roll-type continuous casting machine, a molten metal pool is formed between the rolls by side seals that partition the rolls on both the left and right sides and the circumferential surface of each roll, and molten metal is poured above between the rolls. A molten metal bucket is placed away from the circumferential surface of each roll, and the bottom of the molten metal bucket extends below an imaginary horizontal plane that touches the top surface of one of the rolls, and the bottom of the molten metal bucket is placed at a distance from the circumference of each roll. A twin-roll continuous casting machine characterized by a nozzle that pours molten metal between rolls.