JPS6368248A - Roll type continuous casting method - Google Patents

Abstract

PURPOSE:To prevent the occurrence of breakout and to smoothly execute continuous casting of thin metal sheet by cooling the thin sheet pushed out by passing through a gap between a main roll and each water cooling auxiliary roll. CONSTITUTION:Molten metal 20 supplied into a pouring basin 14 is pushed out from the gap between the main roll 11 and auxiliary roll 12, while cooling as companying with rotation of the rolls 11, 12, to produce the thin sheet 21 having the same thickness as interval of the gap 15. The thin sheet 21 pushed out from the gap 15 is sent to a cooling zone 17, that is, the gap between the main roll 11 and each water cooling auxiliary roll 16 and cooled. After the thin sheet 21 cooled is passed through between guide plates 18, 18, and is sent to straightening rolls 19 to straighten and sent out as the cast thin sheet 21. In this way, the thin sheet 21 is sufficiently cooled at the gap between the main roll 11 and each water cooling auxiliary roll 16, and the occurrence of breakout for the thin sheet 21 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a roll-type continuous casting method for continuously casting a thin metal plate.

(Prior art) As shown in Fig. 2, the roll type continuous casting method uses two rolls 1 and 1 that are rotatably arranged parallel to each other at a predetermined interval.
A molten metal 4 is formed by these two rolls 1 and two fixed weirs 2.2 placed at both ends of are rotated in directions facing each other as shown by arrows A and B, respectively, and while cooling the molten metal 4 by each of these rolls 1.1, these rolls 1.
The steel plate 6 is continuously cast by drawing it out from the gap 5 and solidifying it.

(Problems to be Solved by the Invention) However, in the conventional roll type continuous casting method described above, cooling of the molten metal 4 is insufficient when passing through the gap 5 of the two rolls 1.1. A so-called breakout, in which unsolidified portions exist in the metal gJ plate 6 to be cast, is likely to occur. Furthermore, if sufficient cooling is performed in the gap 5, there is a risk that the molten metal 4 may already solidify in the sump 3. Therefore, there is a problem in that it is difficult to prevent the molten metal from solidifying in the molten metal sump 3 and to prevent breakout of the cast thin metal plate 6 from occurring.

The present invention was made to solve the above-mentioned problems, and it prevents the occurrence of breakout by sufficiently cooling the thin plate extruded from between two rolls without solidifying the molten metal in the tundish. An object of the present invention is to provide a roll-type continuous casting method.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a main roll and an auxiliary roll that are arranged parallel to each other and rotatable with a predetermined gap, and a main roll and an auxiliary roll arranged at both ends of each of these rolls. The molten metal poured into the molten metal reservoir formed between the two fixed weirs is cooled by the rolls and pushed out through the gap.
In a roll-type continuous casting method for continuously casting IL plates,
A plurality of water-cooled auxiliary rolls are arranged on the exit side of the main roll in parallel with the main roll at the predetermined gap and along the circumferential direction of the main roll, and the extruded thin plate is placed between the main roll and each of the water-cooled auxiliary rolls. It is designed to be cooled by passing between the rollers.

(Function) The molten metal poured into the tundish is cooled by the rotation of the main roll and the auxiliary roll, and is extruded from the gap between the two rolls to form a thin plate. This extruded thin plate is sufficiently cooled when passing between the main roll and a plurality of water-cooled auxiliary rolls arranged along the circumferential direction of the main roll. This prevents the occurrence of breakouts in thin metal sheets that are continuously cast without solidifying the molten metal in the tundish.

(Example) Hereinafter, one embodiment of the present invention will be described in detail based on the attached page M.

The first circle shows an outline of a roll type continuous casting apparatus to which the present invention is applied, and the roll type continuous casting apparatus 10 has a main roll 11,
Auxiliary roll 12, fixed liner 3, water-cooled auxiliary roll 16,
It is composed of guide plates 18, 18, straightening rolls 19, and the like. The main roll 11 and the auxiliary roll 12 are arranged horizontally and in parallel, and a gap 15 of a predetermined width d is provided between these rolls 11 and 12. The main roll 11 and the auxiliary roll 12 are arranged to be rotatable with respect to each other, and each rotating shaft is connected to a drive device (not shown), and is driven to rotate in synchronization with each other in directions facing each other as indicated by arrows A and B. . These main roll 11, auxiliary roll 1
2 consists of water-cooled cooling rolls, and each roll 11
．． A cooling mechanism (not shown) for cooling each surface is provided in each of the components 12 .

At both ends of the main roll 11 and the auxiliary roll 12, fixed weirs 13 (only the negative side is shown) are provided, as shown by two-dot chain lines, respectively.
A sump 14 is formed by each surface of the two wooden rolls 11, 12 and the two fixed weirs 13.

The bottom of this water reservoir 14 serves as the gap 15.

The distance d between the gaps 15 determines the thickness of the '3 temporary 21, which will be described later.

The water-cooled auxiliary roll 16 is set to have the same length as the main roll 11 and a smaller outer diameter than the main roll 11, and is parallel to the main roll 11 with an interval d, and the gap 15. A plurality of rolls, for example, 5
They are rotatably arranged with a small gap between each other. The length of these water-cooled auxiliary rolls IS is the main roll 1.
The length is set to be sufficient to cool the thin plate pulled out from the gap 15 between the water-cooled auxiliary roll 1 and the auxiliary roll 12 and suppress the occurrence of breakout, and each water-cooled auxiliary roll 15 is provided with a cooling mechanism that cools its surface. It is being The rotating shaft of each of these water-cooled auxiliary rolls 15 is connected to a drive device (not shown) and is driven to rotate in synchronization with the main roll 11 and in the same direction as the auxiliary roll 12. A cooling section 17 is formed by these main rolls 11 and each water-cooled auxiliary roll 16.

At the outlet of the cooling section 17 located below the main roll 11, two guide plates 18, 18 are arranged facing each other at a distance slightly wider than the above-mentioned interval d, and each of these guide plates 1
The length of 7.18 is set to be the same as the length of the main roll 11.

On the exit side of the guide plate 18, 18, a plurality of sets, for example, four sets of straightening rolls 19 are arranged in parallel at small intervals in the horizontal direction. These straightening rolls 19 are also rotationally driven in synchronization with the main roll 11 by a drive device not disclosed.

The action will be explained below.

Main roll 11, auxiliary roll 12, each water-cooled auxiliary roll 16
The straightening rolls 19 are rotated in synchronism at predetermined rotational speeds, and the molten metal 20 is poured into the sump 14. The molten metal 20 supplied into this molten metal sump 14 is transferred to the main roll 11
As the auxiliary roll 12 rotates, it is cooled and extruded from the gap 15 between these rolls 11 and 12 to form gJ temporary 21 having a thickness of the gap d between the gaps 15. The thin plate 21 pushed out from this gap 15 is sent to the cooling section 17, that is, between the main roll 11 and each water-cooled auxiliary roll 16, and is cooled while passing between the main roll 11 and the water-cooled auxiliary rolls 16. be done. As a result, the thin plate 21 is sufficiently cooled. This cooled thin plate 21 is attached to the guide plate 18.
．． After passing between 18, it is sent to each straightening roll 19, where it is straightened, and then sent out as a thin plate 21 (i, 4).

Thus, the gap 1 between the main roll 11 and the auxiliary roll 12
The thin plate 21 extruded from the main roll 11
and each water-cooled auxiliary roll 16, it is sufficiently cooled. As a result, breakout of the thin plate 21 that is continuously cast is prevented from occurring.

(Effects of the Invention) As explained above, according to the present invention, the main roll and the auxiliary roll are arranged parallel to each other with a predetermined gap so as to be rotatable with each other, and the two fixed rolls are arranged at both ends of each of these rolls. In a roll type continuous casting method in which a thin plate is continuously cast by extruding molten metal poured into a reservoir formed between the weir and the molten metal through the gaps while being cooled by the respective rolls, A plurality of water-cooled auxiliary rolls are arranged parallel to the main roll at the predetermined gap and along the circumferential direction of the main roll, and the extruded thin plate is cooled by passing between the ball roll and each of the water-cooled auxiliary rolls. As a result, it is possible to sufficiently cool the thin plate extruded from the gap between the main roll and the auxiliary roll without solidifying the molten metal in the tundish, and the occurrence of breakout is prevented. Continuous casting of metal sheets can be smoothly performed. Furthermore, it has excellent effects such as being applicable to the production of thin plates made of various materials, such as the production of thin plates that are difficult to process, such as mild steel plates.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a roll type continuous casting apparatus to which the roll type continuous casting method according to the present invention is applied, and FIG. 2 is a configuration diagram of a conventional roll type continuous casting apparatus. 11...Main roll, 12...Auxiliary roll, 13...
・Fixed weir, 14... Pool, 15... Gap, 16...
-Water cooling auxiliary roll, 18...X inner plate, 19...straightening roll, 20...) molten metal, 21...11 roll.

Claims (1)

[Claims] The molten metal is poured into a reservoir formed between a main roll and an auxiliary roll that are arranged parallel to each other and rotatable with a predetermined gap, and two fixed weirs that are arranged at both ends of each of these rolls. , in a roll-type continuous casting method in which a thin plate is continuously cast by being extruded from the gap while being cooled by each of the rolls, on the exit side of the main roll, parallel to the main roll with the predetermined gap and in the circumferential direction of the main roll; A roll-type continuous casting method, characterized in that a plurality of water-cooled auxiliary rolls are arranged along the main roll, and the extruded thin plate is cooled by passing between the main roll and each of the water-cooled auxiliary rolls.