JPH06339757A - Sliding nozzle device in continuous caster - Google Patents

Abstract

PURPOSE:To reduce the drift of molten metal discharging flow and prevent the eccentric casting accompanied with the change of a cast slab width particularly in a twin casting by constituting two sheets of plates and making the lower plate and an immersion nozzle shiftable so as to be possible to positively change the molten metal flowing position. CONSTITUTION:The molten metal is poured into a tundish 1 and flowed into the immersion nozzle 24 through the hole part 4 of a tundish nozzle 3, the hole part 22 of the upper plate 5 and the hole part 20 of the lower plate 19. The molten metal 17 in a mold 12 is cooled and solidified with the mold 12 in a molten metal pool part 16 to cast the cast slab 18. Then, in the case of casting a cast slab having narrow width by shifting the short side 13-1 of the mold by distance (a), by driving a lower plate and immersion nozzle shifting device 21, the immersion nozzle 24 is shifted by the distance (a/2) to execute the casting at the width center. Then, at the time of shifting the immersion nozzle 24, when the drift generates, by driving the shifting device 21, the immersion nozzle 24 is finely shifted to prevent the drift.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding nozzle device for a continuous casting machine.

[0002]

2. Description of the Related Art Conventionally, a sliding nozzle device in a continuous casting machine is a device for controlling a molten metal flow through a pouring port provided on a bottom surface of a tundish, and has a two-plate structure of an upper fixed plate and a lower sliding plate. The devices having the features of Japanese Patent Publication No. 21830/46 and Japanese Patent Publication No. 210/49
No. 16 and the devices having three plate structures of upper and lower fixed plates and an intermediate sliding plate are disclosed in Japanese Patent Publication No. 63-56023.

In any of the known sliding nozzle devices, the immersion nozzle is fixed, and the flow path of the molten metal is adjusted by sliding or rotating the lower or intermediate sliding plate to control the molten metal flow rate. In any case, there is no concept to actively change the lower plate. As described above, since the outflow control of the solution is performed by the structure in which the flow path is closed by sliding or rotating the plate, uneven flow occurs in the discharge flow. However, since there is no mechanism for positively changing the molten metal discharge position, that is, the position of the immersion nozzle, there is a disadvantage due to uneven flow, for example, the impingement velocity of the discharge flow on the mold surface cannot be equalized.

Furthermore, in the twin casting method in which two strips are cast simultaneously with a pair of roll bands, casting is usually performed without changing the width of each strip, and even if the width is changed, dipping is performed. Since the position of the nozzle cannot be moved to an arbitrary position, the molten metal discharge position deviates from the center position of the slab in the width direction, resulting in an eccentric casting state.

[0005]

SUMMARY OF THE INVENTION The present invention prevents or reduces the problem of the sliding nozzle of the prior art, namely, the drift generated when adjusting the molten metal discharge flow, and the displacement and fluctuation of the molten metal level caused by the drift. And, in particular, to prevent eccentric casting due to changes in the width of the slab in twin casting.

[0006]

In order to achieve the above object, the present invention comprises a sliding nozzle device composed of two plates, in which a lower plate and a dipping nozzle are movable to positively change a molten metal outflow position. It was made possible. That is, the present invention is a continuous process including a tundish for storing the molten metal for casting, a tundish nozzle and a stopper device provided in the tundish, a sliding nozzle provided under the tundish, and a mold for injecting the molten metal from the sliding nozzle. In the casting machine, the sliding nozzle communicates with the tundish nozzle, and an upper plate provided with an oval hole having a length corresponding to at least the moving distance of the lower immersion nozzle, and the upper plate hole. It consists of a lower plate with a hole that communicates with it, and an immersion nozzle that communicates with the hole in the lower plate. Furthermore, the lower plate and the immersion nozzle can reciprocate in the moving direction of the immersion nozzle, for example, the width direction of the slab. Slider with lower plate and dipping nozzle moving device It characterized Gunozuru device.
Further, in the present invention, two tundish nozzles are provided in the tundish, and a pair of mold short sides capable of moving the mold, a mold center short side fixed to a mold center portion, and these short sides are sandwiched. Characterized by a sliding nozzle device in a continuous casting machine which is composed of a pair of long sides of a mold and which is connected between two tundish nozzles and a mold, and which is provided with two sliding nozzle devices having the above structure And

The upper plate may be integrated with the tundish nozzle.

[0008]

The present invention has the above-mentioned structure, and since the upper plate is provided with the oblong hole having a length corresponding to the moving distance of the immersion nozzle, the molten metal can flow even if the immersion nozzle is arbitrarily moved. Moreover, by displacing the lower plate and the dipping nozzle to desired positions, it is possible to very effectively prevent uneven flow or eccentric casting of the molten metal.

The present invention will be specifically described below with reference to the drawings.

[0010]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention. In the figure, a tundish nozzle 3 is provided on the bottom wall 2 of the tundish 1, and an upper plate 5 forming a part of the nozzle 3 is provided below the bottom wall 2. The upper plate 5 is provided in contact with the tundish nozzle 3. The upper plate 5 has at least a movable range of the lower plate 19, that is, a hole portion 20 provided in the lower plate 19, as shown in FIG. An oval hole 2 having a distance L (see FIG. 2) from the position of the inner peripheral surface 1 in FIG. 1 to the position where the inner surface m of the upper plate 5 matches the inner surface n of the tundish nozzle.
Two are provided. Reference numeral 21 is a lower plate moving device.

The lower plate hole 20 provided in the lower plate 19 communicates with the hole 25 of the immersion nozzle 24. In this embodiment, the lower plate 19 and the immersion nozzle 24 are integrally provided, and are reciprocated together by the moving device 21. A gas supply pipe (not shown) is provided in the lower plate 19, and a gas body is blown into the molten metal through the opening by supplying an inert gas to the opening of the gas supply pipe. Prevent blockage.

The mold 12 has mold short sides 13-1, 1
3-2 is sandwiched between a pair of long sides 15-1 and 15-2 (not shown) to form a hot water pool 16. 14-1, 14-
Reference numeral 2 denotes a mold short side driving device. In such an apparatus, the molten metal is poured into the tundish 1 and flows into the immersion nozzle 24 through the hole 4 of the tundish nozzle 3, the hole 22 of the upper plate 5 and the hole 20 of the lower plate 19.
The molten metal 17 in the mold 12 is cooled and solidified by the mold 12 in the molten metal pool portion 16, and a cast piece 18 is cast.

Here, it is assumed that the mold short side 13-1 is moved by the distance a to cast a narrow slab. In this case, the lower plate / immersion nozzle moving device 21 is driven to move the immersion nozzle 24 by the distance a / 2, and width center casting is performed. When the casting is stopped, the tundish nozzle 3 is closed by the stopper 6.

When the immersion nozzle 24 is moved and a drift occurs, the moving device 21 is driven to drive the immersion nozzle 24.
To make a small movement to prevent drift. When the sliding nozzle device of the present invention is applied to a continuous casting device for obtaining two strips from a single mold, it is as follows. That is, another tundish nozzle (not shown) is provided on the tundish bottom wall 2 in addition to the tundish nozzle 3, and a pair of mold short sides 13-1 and 13-2 capable of moving the mold 12 are provided. , A two-chamber mold that is composed of a mold center short side (not shown) fixed to the center of the mold 12 and a pair of mold long sides 15-1 and 15-2 sandwiching these short sides. Between the individual tundish nozzles and the molds of the two chambers, two sliding nozzle devices communicating with them and having the above structure may be arranged.

[0015]

As described above, according to the present invention, since the immersion nozzle is constructed so as to be movable in the width direction of the slab, it is possible to avoid the drift of the discharge flow of the immersion nozzle and to always perform the slab width center casting. Can be stably cast, and its industrial effect is great.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of an upper plate of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tundish 2 ... Tandish bottom wall 3 ... Tundish nozzle 4 ... Tundish nozzle hole 5 ... Upper plate 6 ... Stopper 12 ... Mold 13-1, 13-2 ... Mold short side 14, 1-14-2 ... Mold Short side driving device 15 ... Mold long side 16 ... Molten pool portion 17 ... Molten metal 18 ... Cast slab 19 ... Lower plate 20 ... Lower plate hole 21 ... Lower plate moving device 22 ... Upper plate hole 24 ... Immersion nozzle 25 ... Immersion Nozzle hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideo Tsukiji, 1-1, Higashihama-cho, Hachiman-nishi-ku, Kitakyushu, Fukuoka Prefecture, Kurosaki Ceramics Co., Ltd. Saki Ceramics Co., Ltd.

Claims (2)

[Claims] 1. A tundish for storing molten metal for casting,
In a continuous casting machine comprising a tundish nozzle provided in the tundish, a stopper device, a sliding nozzle provided in the lower part of the tundish, and a mold for injecting the molten metal from the sliding nozzle, the sliding nozzle is a tundish nozzle. An upper plate that communicates with at least a hole having a length corresponding to the moving distance of the lower immersion nozzle, a lower plate having a hole that communicates with the upper plate hole, and a lower plate hole It consists of an immersion nozzle that communicates with
A sliding nozzle device in a continuous casting machine, wherein a lower plate / immersion nozzle moving device for reciprocally moving the lower plate and the immersion nozzle in a moving direction of the immersion nozzle is provided on the lower plate. 2. A tundish nozzle provided on a bottom wall of a tundish for storing a molten metal for casting, and a pair of mold short sides capable of moving a mold and a mold center short side fixed to a mold center portion, It is composed of a pair of mold long sides sandwiching these short sides, each chamber of the mold is arranged at a position corresponding to the tundish nozzle, and between the two tundish nozzles and the mold, respectively. Upper plate provided with an immersion nozzle communicating with the tundish nozzle and at least a hole having a length corresponding to the moving distance of the immersion nozzle, and a lower plate provided with a hole communicating with the upper plate hole Is provided between the tundish nozzle and the dipping nozzle, respectively, and a sliding nozzle device in a continuous casting machine.