JP2843078B2 - Twin roll continuous caster and method of starting pouring by twin roll continuous caster - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twin-roll continuous caster and a method of starting pouring by the twin-roll continuous caster.

[Prior Art] Currently, there is a twin-roll continuous caster as shown in FIG. 3, for example.

In the drawing, reference numeral 1 denotes a ladle having a nozzle 2 for discharging molten metal (molten metal) on a lower surface thereof and having an opening / closing plate 3 for opening and closing the nozzle 2, and 4 denotes a nozzle located below the ladle 1 and a nozzle from the ladle 1. 5 is a tundish to which the molten metal is supplied via 2; A core for supplying the molten metal 9 from the ladle 1 to a pool 8 formed by the side weirs 7 disposed in the core, and a solidified shell 10 formed by cooling the molten metal 9 by the casting rolls 6, 6 '. A guide roll 11 guides the cast slab 12 by being drawn downward from a gap G formed at the opposing portion of the casting rolls 6, 6 '. A pinch roll 13 pulls the cast slab 12 at a required speed. It is.

In the twin-roll type continuous casting machine as described above, when starting the casting, the ladle 1, the tundish 4, the core 5, and the side weir 7 are preheated in a heating furnace not shown in the related art, and then the casting is firstly performed. Installed casting rolls 6,
Side weirs 7 are arranged at both ends in the axial direction of 6 ', then the core 5 and the tundish 4 are set on the casting rolls 6, 6' in this order, and then the ladle 1 is set on the top of the tundish 4. Was.

[Problem to be Solved by the Invention] Conventionally, since the side weir 7, the core 5, the tundish 4, and the ladle 1 are set in the above order, the side weir 7 cools down before pouring starts. As a result, a solidified shell is formed on the inner side surface (the surface in contact with the molten metal) of the side weir 7 due to the cooled side weir 7. After the start of casting, the solidified shell is pulled by the solidified shell 11 formed on the surface of the casting rolls 6, 6 'and falls off from the inner side surface of the side weir 7, and the dropped solidified shell is removed by the gap G between the casting rolls 6, 6'. When passing through the gap G, the gap G is pushed by the dropped solidified shell and is suddenly opened, so that a slab 12 occurs in the slab 12, so that continuous casting cannot be performed.

The present invention has been made in view of the above circumstances, and a twin-roll continuous caster capable of preventing a plate breaking phenomenon during casting and achieving continuous casting, and a method of starting pouring by the twin-roll continuous caster The purpose is to provide.

[Means for Solving the Problems] A first aspect of the present invention relates to a pair of casting rolls which are disposed in parallel on a horizontally movable trolley at a required interval and whose facing surface rotates downward. A side dam that can be disposed at both axial end portions of the pair of casting rolls, a core that can be installed on the bogie so as to be located above an opposing gap between the pair of casting rolls, A twin-roll continuous caster, comprising: a tundish that can be connected to the upper end and can be installed on the carriage; and a ladle that can be installed above the pair of casting rolls set at a casting position. Such is the case.

A second invention provides a water pool formed by side weirs disposed in parallel at a required interval and disposed at both axial end portions of a pair of casting rolls whose facing surfaces rotate downward. A molten metal is supplied from a ladle through a tundish and a core, and the molten metal is cooled by the pair of casting rolls to form a solidified shell. The solidified shell is formed by a gap formed on a facing surface of the pair of casting rolls. In a twin-roll continuous caster that performs casting by pulling downward, the ladle is set at the casting position by at least preheating, and then the gap formed on the facing surface of the pair of casting rolls located at a position other than the casting position A pre-heated core and a pre-heated tundish are arranged on the upper side, and then a pair of casting rolls, a core and a tundish are moved together and set in the lower casting position of the ladle, and That after, it relates to a pouring Started by twin roll caster, which comprises pouring set the side weir preheated to both axial end sides of the pair of casting rolls.

[Operation] Since the side weir can be set last, the temperature drop of the side weir is small until pouring is started, and no solidified shell is formed on the inner surface of the side weir. Therefore, after the start of casting, the gap between the pair of casting rolls is expanded to prevent the occurrence of plate breakage.

Embodiment An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of a twin-roll continuous caster according to the present invention, and the same reference numerals as those in FIG.

In the figure, reference numeral 14 denotes a truck that rotatably holds a pair of water-cooled casting rolls 6, 6 'at a required interval, and the truck 14 is movably mounted on a guide rail 16 via wheels 15. The tip of a piston rod 18 of a cylinder 17 appropriately disposed is connected to the carriage 14 so that the carriage 14 moves on the guide rail 16 as the piston rod 18 of the cylinder 17 advances and retreats.

On the upper surface of the carriage 14, a frame structure 19 is provided,
The frame 19 is provided with a concave portion 19a for supporting the tundish 4 by inserting the protruding portion 4a of the tundish 4 from above, and for supporting the core 5 in the same manner as the tundish 4. The support member 20 is provided inside the frame body 19.

Next, a method of starting pouring using the twin-roll continuous caster A of the present invention will be described with reference to FIGS. 2 (A), (B) and (C).

First, the preheated ladle 1 is set at the casting position. The carriage 14 is pulled out by the cylinder 17, and the casting rolls 6, 6 'are positioned at positions other than the casting position.
A pre-heated core 5 for supplying a molten metal (molten metal) 9 between the casting rolls 6 and 6 'is mounted on a frame member 19 so as to be positioned above a gap G formed on the facing surfaces of the casting rolls 6 and 6'. In addition, the preheated tundish 4 is inserted into the recess 19a of the frame 19 so that the preheated tundish 4 is positioned above the core 5, and is supported by the frame 19 (FIG. 2 (A)). State).

Next, the carriage 14 is moved by the cylinder 17 along the guide rail 16 to the casting position below the ladle 1 to position the tundish 4 below the nozzle 2 of the ladle 1 (the state of FIG. 2 (B)).

Thereafter, the preheated side weirs 7 are disposed at both axial ends of the casting rolls 6, 6 '(the state of FIG. 2 (C)).

After setting in the above order, the molten metal is supplied into the ladle 1, the opening / closing plate 3 is moved, the nozzle 2 of the ladle 1 is opened, and the molten metal 9 is moved from the ladle 1 to the tundish 4 and the core 5
Are sequentially supplied to a pool 8 formed by the casting rolls 6, 6 'and the side weir 7. That is, when pouring, the side weir 7 can be preheated until just before the molten metal 9 is supplied from the ladle 1, so that the side weir 7 is in a high temperature state. A solidified shell can be prevented from being generated on the surface in contact with the molten metal). Accordingly, it is possible to prevent the occurrence of plate breakage caused by the solidified shell generated on the inner side surface of the side weir 7, and to achieve continuous casting of the thin metal plate.

It should be noted that the present invention is not limited to the embodiment shown and described, for example, using a moving device such as an electric motor in addition to the cylinder, making the supporting members of the frame and the core integral with the bogie, Supporting the tundish by inserting and placing the tundish on the frame,
Although the case where the molten metal is supplied to the ladle and pouring is started after the ladle is preheated and set in the casting place has been described,
It is optional to supply the molten metal to the preheated ladle and then set it at the casting place, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[Effect of the Invention] As described above, according to the twin-roll continuous caster and the method of starting pouring by the twin-roll continuous caster of the present invention, (i) the space at the lower casting position of the ladle set at the casting position Without any restrictions, it is easy to set a pair of casting rolls, cores, tundishes, side weirs, etc., and effective use of space can be achieved. (Ii) Ladle that is difficult to move quickly (Iii) Immediately before the start of pouring, it is possible to perform various arrangements required for assembling the twin-roll continuous caster and starting pouring by the twin-roll continuous caster. Set the side weir in
At the start of pouring, the side weir can be used at a high temperature, so that it is possible to prevent the solidification shell from being generated on the inner surface of the side weir (the surface in contact with the pouring). (Iv) (iii) Prevents the plate breaking phenomenon Various excellent effects can be achieved, such as being able to achieve continuous slabs of thin metal sheets.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a twin-roll continuous caster of the present invention, and FIG.
FIGS. (A), (B) and (C) are schematic diagrams showing the sequence of a pouring start method by a twin-roll continuous casting machine of the present invention, and FIG. 3 is a schematic diagram showing a conventional twin-roll continuous casting machine. . In the figure, 1 is a ladle, 2 is a nozzle, 3 is an opening and closing plate, 4 is a tundish, 4a is a protruding portion, 5 is a core, 6, 6 'is a casting roll, 7 is a side dam, 8 is a pool, and 9 is a pool. Molten metal, 10 is a guide roll, 11 is a solidified shell, 12 is a slab, 13 is a pinch roll, 14 is a bogie, 15 is a wheel, 17 is a cylinder, 19 is a frame,
19a is a concave portion, 20 is a supporting member, A is a twin-roll continuous caster, G
Indicates the gap between the casting rolls 6, 6 '.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Heiji Kato 1st Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Prefecture Inside the second factory of Yokohama, Ishikawajima-Harima Heavy Industries Co., Ltd. No. 1, Nakahara-cho, Ishikawajima-Harima Heavy Industries, Ltd., Yokohama No. 2 Plant (58) Field surveyed (Int.Cl. ⁶ , DB name)

Claims (2)

(57) [Claims] 1. A pair of casting rolls which are disposed in parallel on a horizontally movable carriage at a required interval and whose facing surface is turned downward, and both ends in the axial direction of the pair of casting rolls. A side weir that can be disposed on the part, a core that can be installed on the bogie so as to be located above the facing gap between the pair of casting rolls, and an upper end of the core that can be connected to and that can be installed on the bogie. A twin-roll continuous caster, comprising: a tundish; and a ladle that can be installed above the pair of casting rolls set at a casting position. 2. A ladle from a ladle to a pool formed by side dams provided at both ends in the axial direction of a pair of casting rolls which are arranged in parallel at a required interval and whose facing surfaces rotate downward. The molten metal is supplied through a dish and a core, and the molten metal is cooled by the pair of casting rolls to form a solidified shell, and the solidified shell is drawn below a gap formed on a facing surface of the pair of casting rolls. In the twin-roll type continuous casting machine, the ladle is set at the casting position by at least preheating, and then over the gap formed on the facing surface of the pair of casting rolls located at a position other than the casting position. Arrange the preheated core and the preheated tundish, then move the pair of casting rolls, the core and the tundish together and set them in the lower casting position of the ladle, and then Pouring start method according twin roll caster, which comprises serial to set the side weirs preheated to both axial ends sides of the pair of casting rolls pouring.