JPH0719652Y2 - Twin roll type continuous casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a twin roll type continuous casting machine, and particularly to a twin roll type continuous casting machine with improved airtightness of a pressurizing chamber formed on a pool of molten metal between twin rolls. The present invention relates to a roll type continuous casting machine.

[Prior Art] In recent years, research on a continuous casting machine that directly supplies molten metal (hereinafter referred to as molten metal) to the gap between rotating twin rolls and applies gas pressure to the molten metal surface to directly produce metal sheet material from the molten metal Is being promoted. While pressing the molten metal surface of the molten metal to be contacted with the twin roll surface, it can be solidified in a state of high heat transfer coefficient, while improving the quality and flatness of the cast metal sheet material, The thickness of this plate material can be increased.

For example, in order to perform continuous casting in this pressure state, except for the exit side of the plate material cast between the twin rolls, a pressure chamber is formed by surrounding the tundish on the twin rolls to form a molten metal surface. A continuous casting machine that pressurizes gas (for example, JP-A-59-137162) is known.

However, in this continuous casting machine, it is necessary to provide a large pressurizing chamber that surrounds the tundish, and since the tundish is in the pressurizing chamber, there is a drawback that the molten metal cannot be continuously supplied from the ladle to the tundish. there were.

In order to eliminate such drawbacks, the present applicant first established a continuous casting machine that partitions the tundish and twin rolls to form a pressurizing chamber and pressurizes the molten metal surface with the pressurizing gas in the pressurizing chamber. (Japanese Patent Laid-Open No. 63-224507).

In this continuous casting machine, a pressurizing chamber that maintains the airtightness of the pressurizing gas is formed from the lower end of the tundish toward the upper surface of the roll and the upper side dams at both ends of the roll.

[Problems to be Solved by the Invention] However, in the twin roll type continuous casting machine described above, the side weirs provided at both ends of the roll to form the molten metal pool are made of refractory bricks so that the molten metal at a high temperature of about 1300 ° C can be stored. , Etc. On the other hand, the pressurizing chamber continuously formed on the side dam is made of steel plate such as heat resistant steel. Since the thermal expansion of the steel plate is large despite the small thermal expansion of this refractory, the connection between the side dam and the pressurizing chamber absorbs the expansion and contraction of the steel plate, and
The tightness of the pressurized gas must be maintained.

Therefore, a fireproof fiber cloth (glass wool, etc.) was brought into contact with the continuous portion of the side weir and the pressure chamber.
The airtightness of the pressurizing chamber was not sufficient.

The present invention has been made to solve these problems, and the purpose thereof is to improve the airtightness of the continuous portion between the side dam made of refractory and the pressure chamber made of steel plate,
It is an object of the present invention to provide a twin roll type continuous casting machine capable of applying a stable and efficient gas pressure to the molten metal surface of the molten metal pool.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides side weirs at both ends of a twin roll to form a pool of molten metal supplied from a tundish on the twin roll. In a twin roll type continuous casting machine in which a frame member is connected to the lower end of the tundish to cover the pool and a pressurizing chamber for gas pressurizing the molten metal surface in the pool is formed, the frame member in contact with the side dam A seal chamber that opens downward is formed at the lower end along the longitudinal direction, and a seal body having multiple metal foils is provided in the seal chamber with one side thereof projecting downward from the opening, and The frame member is provided with pressing means for pressing the seal body onto the side dam.

[Operation] According to the above configuration, a seal body having multiple metal foils formed therein is provided in the seal chamber formed at the lower end portion of the frame member with one side portion thereof protruding downward from the opening, and the seal body is provided on the side surface. Since the pressure is applied onto the weir, the gas leakage from the pressurizing chamber is less and the airtightness of the pressurizing chamber can be improved as compared with the case where glass wool is provided between the frame member and the side weir. Moreover, since one side part of the seal body is pressed onto the side weir by the pressing means, even when the frame member expands or contracts with respect to the side weir, one side part of each metal foil is placed on the side weir. The airtightness of the pressurizing chamber can be maintained by keeping the linear contact. Therefore, a stable gas pressure can always be applied to the molten metal surface of the molten metal pool, and a metal plate material having excellent quality can be continuously cast and formed.

[Embodiment] A preferred embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the twin roll type continuous casting machine according to the present embodiment has a twin roll formed mainly by two rolls 2 and side rolls provided at both ends of the rolls 2 and 2. Weir 6 and tundish 3 on top of rolls 2,2
And a pressure chamber 4 formed between the rolls 2, 2 and the tundish 3, and a seal member 7 provided at the lower end of a frame member 4a partitioning the pressure chamber 4. To be done.

Specifically, between the rolls 2 and 2, a gap corresponding to the thickness of the thin metal plate 13 to be cast is formed, and the roll is hung on a support frame (not shown) and rotated while being cooled during casting. It is supposed to be done.

Preheated side weirs 6 are provided on the support frames at both ends in the axial direction of the rolls 2, 2 so as to form the molten metal pool 5 between the rolls 2, 2. The side dam 6 is provided so as to cover the upper part of the roll 2 to the lower part of the gap between the rolls 2, 2 and is pressed against the end part of the roll by an appropriate pressure. A molten metal pool 5 of the molten metal 12 supplied from the tundish 3 is formed by the side dams 6 of the rolls 2, 2 and further, a metal plate material 13 is continuously formed from the gap between the rolls 2, 2.
Are configured to be cast. The side dam 6 is made of a refractory material that can withstand high temperature molten metal.

A tundish 3 is provided above the molten metal pool 5. The tundish 3 stores the molten metal 12 supplied from a ladle (not shown) and also supplies the molten metal 12 to a molten metal pool 5 formed by the rolls 2 and 2 and the side dams 6 from a pouring port provided at the bottom. Is composed of.

Between tundish 3 and rolls 2,2, this roll
A rectangular pressurizing chamber 4 is formed so as to cover the molten metal pool 5 formed between 2 and 2.

The pressurizing chamber 4 is partitioned by being connected to the lower end portion of the tundish 3 by a frame member 4a, and has substantially the same cross-sectional shape as the tundish 3, and is provided on the upper surface of the twin rolls 2, 2 and both end portions of the rolls. It is made of a heat-resistant steel plate having a thickness of 2 to 3 mm so as to hang down to the upper end of the side dam 6.

The pressurizing chamber 4 is provided with a pressure gas supply / discharge hole 15. The molten gas surface of the molten metal pool 5 formed between the rolls 2, 2 is gas-tightly pressurized by the pressurized gas fed from the supply / discharge holes 15.

A pressure gas supply / discharge device (not shown) is connected to the supply / discharge hole 15, and a pressure gas such as an inert gas is boosted, fed, and discharged by a compressor and an opening / closing valve of the device.

At the lower end of the pressurizing chamber 4 in contact with the surface of the rolls 2 and 2,
Appropriate sealing plate for sealing the pressure gas in the pressurizing chamber 4
16 are provided.

A seal member 7 is formed at the lower end of the frame member 4a of the pressurizing chamber 4 that contacts the side dam 6. This seal member 7
Consists of a seal chamber 14 and a seal body 8 mounted in this chamber. Specifically, as shown in FIG. 2, the seal chamber 14 is formed in a U-shape with a downward opening by attaching a channel member to the lower end of the frame member 4a of the pressurizing chamber 4.
An opening 17 is formed below the seal chamber 14 with a slight gap from the upper end of the side dam 6.

A mounting plate 9 is provided in the seal chamber 14 in the longitudinal direction of the seal chamber 14. This mounting plate 9 is a seal chamber
This mounting plate 9 is provided so as to be vertically slidable inside
A seal body 8 is attached to the lower surface of the. This seal body 8
Since it is formed by stacking foils such as stainless steel, it has excellent flexibility and heat insulation. One end surface of the cut surface of the multiple metal foils 8 is attached to the mounting plate 9, and the other end surface thereof is slightly protruded from the opening 17 and is in contact with the upper end of the side dam 6. A spring member such as a coil spring is provided between the upper surface of the mounting plate 9 and the ceiling in the seal chamber 14.
Ten are provided. With the pressing force of this spring member 10, the sealing chamber
The lower end of the metal foil 8 mounted on the mounting plate 9 which is slid up and down by 14 is pressed against the upper end of the side dam 6. The pressure of the metal foil 8 against the side dam 6 enhances the airtightness of the pressure gas in the pressurizing chamber 4.

Next, the operation of this embodiment will be described.

The twin rolls 2, 2 are rotated in the direction of the arrow in the figure while being cooled. Along with this, the molten metal 12 is poured from the ladle into the tundish 3, and the molten metal 12 is fed from the pouring port at the bottom of the tundish 3 between the two rolls 2 and 2 and side weirs 6 provided at both ends thereof. Molten metal pool 5 formed by
Is supplied to.

Then, the pressure chamber 4 provided between the twin rolls 2, 2 and the tundish 3 is fed with the inert gas whose pressure is increased by the pressure gas supply / discharge means from the supply / discharge hole 15.

Molten metal 12 in the molten metal pool 5 by the pressurized gas fed into the pressurizing chamber 4
The molten metal surface is pressurized and the molten metal 12 is continuously cast as a metal plate material 13 while being rapidly cooled between the twin rolls 2, 2.

The feature of this embodiment is that the seal member 7 is provided at the connecting portion between the lower end of the pressurizing chamber 4 and the upper end of the side dam 6.

Since the frame member 4a of the pressurizing chamber 4 is formed of a steel plate, the frame member 4a is expanded and contracted under the influence of the high temperature molten metal 12 supplied to the molten metal pool 5. On the other hand, since the side weir 6 is made of a refractory material, expansion and contraction due to the influence of heat is relatively small.
Due to this heat effect, the lower end of the frame member 4a of the pressurizing chamber 4 connected to the upper end of the side dam 6 moves in the left-right direction on the upper end of the side dam 6. The amount of movement due to this heat effect is allowed by the multiple metal foils 8 that are in contact with the upper end surface of the side dam 6 while being pressed by the spring member 10 of the seal chamber 14 of the seal member 7. Therefore, the frame member of the pressurizing chamber 4
The connecting portion between the lower end of 4a and the side weir 6 does not reduce the airtightness of the pressurized gas regardless of the thermal effect of the molten metal 12,
The thin metal plate 13 can be continuously cast.

As shown in FIG. 3, the sealing member 7 is formed by multiplying a long metal foil between the mounting plate 9 of the seal chamber 14 and the opening 17 by folding back and over. Good. Further, as shown in FIG. 4, a seal member 7 having a seal chamber 20 opened toward the upper end surface of the side dam 6 via the air cylinder 18 is provided at the lower end of the frame member 4a of the pressurizing chamber 4. Provided,
Multiple metal foils 8 may be attached to the sealing chamber 20 and pressed against the upper end surface of the side dam 6 by the pressing force of the air cylinder 18 to be connected.

[Effect of Invention] In summary, according to the present invention, the following excellent effects are exhibited.

(1) In the seal chamber at the lower end of the frame member, a seal body made of multiple metal foils is provided with one side thereof projecting downward from the seal chamber, and the seal body is pressed onto the side dam. Since it is configured to seal, the airtightness of the pressurizing chamber can be enhanced. Moreover, even when the frame member expands or contracts with respect to the side dam, the metal foil can be kept in contact with the side dam and the airtightness of the pressurizing chamber can be maintained. Therefore, a stable pressurizing gas can always be applied to the molten metal surface of the molten metal pool to pressurize it, and a metal plate material having excellent quality can be continuously cast and formed.

(2) Since sealing is performed by the sealing body made of multiple metal foils, the heat insulation is excellent and the molten metal can be kept warm.

(3) Since the pressurizing chamber is formed between the twin rolls and the tundish, the molten metal can be connected and supplied to the tundish.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, and FIG.
II-II sectional view of FIG. 3, FIG. 3 and FIG. 4 are sectional views of another embodiment of the seal member shown in FIG. In the figure, 1 is a twin roll type continuous casting machine, 2 is a roll, 3 is a tundish, 4 is a pressure chamber, 4a is a frame member for partitioning the pressure chamber, 5 is a molten metal pool, 6 is a side dam, and 7 is Sealing member,
8 is a metal foil and 12 is a molten metal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Hisahiko Fukase 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries Co., Ltd. Technical Research Institute (56) Reference JP-A 1-271037 (JP, A) JP 62-130749 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A pool of molten metal supplied from a tundish is formed on the twin roll by providing side weirs at both ends of the twin roll, and a frame member is connected to the lower end of the tundish to form the pool. In a twin roll type continuous casting machine that forms a pressurizing chamber for gas pressurizing the molten metal surface in the pool, at the lower end of the frame member in contact with the side dam,
A seal chamber opening downward is formed along the longitudinal direction, and a seal body having multiple metal foils is provided in the seal chamber with one side portion thereof protruding downward from the opening, and the seal member is provided on the frame member. A twin roll type continuous casting machine comprising a pressing means for pressing the seal body on the side dam.