JP2003285144A - Immersion nozzle device for continuous casting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an immersion nozzle device for continuous casting which can surely shorten a working time required for inserting an oxygen feed pipe for the removal of clogging and, at the same time, can prevent damage to a molten metal holding pot and a deterioration in quality of casting. <P>SOLUTION: This immersion nozzle device for continuous casting includes an immersion nozzle 63 provided with a flow hole 65 for receiving molten steel m from an outflow port 1b in a tundish A and for injecting the molten steel m into a casting mold 11. A lower plate 61 for moving a nozzle body 64 in a direction perpendicular to the direction of opening of the outflow port 1b is disposed below the tundish A. A nozzle 67 for release in the atmosphere is additionally provided on the lower plate 61 so that the nozzle 67 can communicate with the outflow port 1b. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an immersion nozzle device for continuous casting for injecting molten metal from a molten metal container such as a tundish into a mold.

[0002]

2. Description of the Related Art Generally, in continuous casting of molten metal, an immersion nozzle device is used when the molten metal is poured into a mold from a molten metal container such as a tundish. Conventionally, as this type of immersion nozzle device, for example, one as shown in FIG. 3 has been adopted. This nozzle will be described with reference to FIG. 3. In the figure, the immersion nozzle device indicated by reference numeral 91 includes an outlet 92 of a molten metal storage pan 92.
A fixed nozzle 93 communicating with a and a movable nozzle 95 that can open and close a nozzle opening of the fixed nozzle 93 by driving a hydraulic cylinder 94 are provided.

Casting by such an immersion nozzle device is
The nozzle opening of the fixed nozzle 93 is closed by the peripheral portion of the nozzle opening of the moving nozzle 95, and then the molten metal is supplied into the molten metal storage pan 92, and then the nozzle opening of the moving nozzle 95 is aligned with the nozzle opening of the fixed nozzle 93. Then, the molten metal in the molten metal storage pan 92 is poured into a mold (not shown).

[0004]

By the way, in the above-mentioned immersion nozzle device, the outflow port may be clogged by the solidified material or the filling material of the molten metal supplied into the fixed nozzle at the start of casting. Therefore, an oxygen supply pipe is inserted into the outflow port from above the molten metal storage pan to supply oxygen to eliminate clogging.

However, since the outlet of the molten metal container is hidden by the molten metal at the start of casting, it is difficult to insert the oxygen supply pipe into the outlet of the molten metal container when the clogging is eliminated. However, there is a problem that not only a great amount of time is required for inserting the oxygen supply pipe, but also the molten metal storage pan is damaged. Further, since oxygen is supplied from above the molten metal container, the molten metal comes into contact with oxygen, which causes a problem that the quality of the casting is deteriorated.

The present invention has been made in order to solve such a technical problem, and it is possible to surely shorten the time required for inserting the oxygen supply pipe when the clogging is eliminated, and at the same time, to hold the molten metal container. It is an object of the present invention to provide a submerged nozzle device for continuous casting, which can prevent damage from occurring and deterioration of the quality of the casting.

[0007]

The immersion nozzle device for continuous casting according to the present invention, which has been made to achieve the above object, receives molten metal from an outlet of a molten metal container and injects it into a mold. In a dipping nozzle device for continuous casting, which is provided with a dipping nozzle having a flow hole for holding, a nozzle holding for moving the dipping nozzle in a direction perpendicular to the opening direction of the outlet below the molten metal container. A plate is disposed, and an atmosphere opening nozzle that can communicate with the outlet is attached to the nozzle holding plate.

With this structure, when clogging occurs at the outlet of the molten metal container, after the immersion nozzle is moved by the nozzle holding plate and the atmosphere opening nozzle communicates with the outlet. The clogging can be eliminated by inserting an oxygen supply pipe into the atmosphere opening nozzle to supply oxygen. Therefore, it is possible to easily perform the insertion work of the oxygen supply pipe when the clogging is cleared, the insertion work time can be surely shortened, and the occurrence of damage to the molten metal storage pan can be prevented. In addition, the fact that oxygen can be supplied from the nozzle for opening the atmosphere under the molten metal storage pan makes it difficult for the molten metal to come into contact with oxygen, and can prevent deterioration of the quality of the casting.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An immersion nozzle device for continuous casting according to the present invention will be described below with reference to an embodiment shown in the drawings. FIG. 1 is a cross-sectional view showing a usage state of the immersion nozzle device according to the embodiment of the present invention. As shown in FIG. 1, reference numeral 1 is a mass brick attached to the bottom of a tundish A serving as a molten metal container for containing a molten metal (molten steel) m. An inlet 1a is provided, and an outlet 1b for molten steel m is provided at the bottom.

A base plate 2 is attached to the bottom surface of the tundish A, and the base plate 2 is provided with a through hole 2a which opens in the vertical direction. A plate cassette 3 (hereinafter, simply referred to as a cassette) including an upper frame 3a, a lower frame 3b and a side frame 3c is mounted on the base plate 2. The cassette 3 includes an upper plate 4 having an upper end facing the through hole 2a and the upper plate 4
Lower plate (nozzle holding plate) 6 located below
1, and an intermediate plate (moving plate) 6 interposed between the upper and lower plates 4 and 61, respectively. Further, a hydraulic cylinder 7 for applying a lateral moving force to the intermediate plate 6 and the lower plate 61 (a hydraulic cylinder for applying a moving force to the intermediate plate 6 is not shown) is attached.

In the upper plate 4, the outlet 1b is provided.
An upper nozzle 8 communicating with the above is installed. An immersion nozzle 63 for controlling the flow rate of the molten steel m is attached to the lower plate 61. The immersion nozzle 63 has a nozzle body 64, and is entirely made of refractory material. The nozzle body 64 is provided with a flow hole 65 for receiving the molten steel m from the outlet 1b of the mass brick 1 (nozzle hole of the intermediate plate) and injecting it into the mold 11.

Further, the lower plate 61 is provided with an atmosphere opening nozzle 67 having an atmosphere opening hole 67a capable of communicating with the outflow port 1b (nozzle hole of the intermediate plate). The atmosphere opening hole 67a of the nozzle 67 is arranged at a position separated from the flow hole 65 by a predetermined dimension in the direction of the arrow a, and is configured so as to match with a nozzle hole (described later) of the intermediate plate 6. . The intermediate plate 6
Has a nozzle hole 6a. A shutter portion 6b is arranged laterally of the intermediate plate 6.

Casting using the immersion nozzle device thus constructed will be described with reference to FIGS. 2 (a) to 2 (c). In addition, the lower plate 61 has the atmosphere opening hole 67a in advance.
It is assumed that it is arranged at a position such that the axis of the above is aligned with the axis of the upper nozzle 8. First, a hydraulic cylinder (not shown) is driven to apply a traveling force in the direction of arrow a to the intermediate plate 6, and the intermediate plate 6 is moved to a predetermined forward movement position as shown in FIG. 2 (a). In this case, the intermediate plate 6
When is moved to the forward movement position, the opening portion of the upper nozzle 8 is closed by the shutter portion 6b.

Then, the pre-heated tundish A
When the molten steel m is accommodated therein, a part thereof flows out of the tundish A through the outlet 1b of the mass brick 1 and flows into the upper nozzle 8.

Thereafter, a hydraulic cylinder (not shown) is driven to further apply a traveling force in the direction of arrow a to the intermediate plate 6, and the intermediate plate 6 is moved to a predetermined position as shown in FIG. 2 (b). Let In this case, when the intermediate plate 6 is moved and placed at a predetermined position, the atmosphere opening hole 67a is opened.
Communicate with the upper nozzle 8 via the nozzle hole 6 a of the intermediate plate 6. Therefore, the molten steel m in the upper nozzle 8 passes through the nozzle hole 6a, further passes through the atmosphere opening hole 67a, and flows into the mold 11.

Then, the hydraulic cylinder 7 is driven to apply the advancing force in the direction of arrow a to the lower plate 61, as shown in FIG.
The lower plate 61 is moved by a predetermined amount as shown in FIG. In this case, when the lower plate 61 is moved and placed at a predetermined position, the flow hole 65 of the immersion nozzle 63 communicates with the upper nozzle 8 through the nozzle hole 6 a of the intermediate plate 6. Therefore, the molten steel m in the upper nozzle 8 passes through the nozzle hole 6a and further through the flow hole 65, and at a predetermined speed, the mold 1
It flows into 1. In this way, casting can be performed.

Here, the atmosphere opening hole 67a is connected to the nozzle hole 6a.
When the molten steel m in the upper nozzle 8 does not flow out toward the nozzle hole 6a (when the casting is started), when the molten steel m does not flow out toward the nozzle hole 6a (when the outlet 1b or the upper nozzle 8 is clogged),
Oxygen is supplied by exposing an oxygen supply pipe (not shown) from below into the atmosphere opening hole 67a. As a result, the flowability of the molten steel m in the path from the atmosphere opening hole 67a to the mass brick 1 (outlet 1b) via the nozzle hole 6a and the upper nozzle 8 is improved, and clogging of the outflow hole 1a and the like is eliminated. , Communicate.

Therefore, in this embodiment, the nozzle 67 is provided in the lower plate 61, and the oxygen supply pipe is exposed (inserted) from the lower side into the atmosphere opening hole 67a of the nozzle 67 to supply oxygen. Since it is configured as described above, the working time can be surely shortened and damage to the tundish A can be prevented from occurring. Further, in the present embodiment, in order to eliminate the clogging,
Since the oxygen supply pipe is not placed in the tundish A (molten steel m) and the work is not performed from the side of the mass brick 1, it is difficult for the molten steel m to come into contact with oxygen, and it is possible to prevent quality deterioration of the casting.

Further, in the present embodiment, the case where the lower plate 61 is provided with the nozzle 67 for opening to the atmosphere has been described, but the present invention is not limited to this, and the oxygen opening (atmosphere of the atmosphere) is also formed in the intermediate plate. A nozzle for (opening) may be provided. In this case, when clogging occurs in the outlet of the mass brick or in the upper nozzle, it is not necessary to open the oxygen in the nozzle of the lower plate (nozzle for casting) by opening the oxygen in the nozzle of the intermediate plate. Therefore, there is no melting loss due to oxygen in the intermediate plate that occurs when oxygen holes are formed using the casting nozzle, and its durability can be improved.

[0020]

As is apparent from the above description, according to the immersion casting nozzle device for continuous casting according to the present invention, it is possible to surely shorten the insertion work time of the oxygen supply pipe when the clogging is eliminated, and It is possible to prevent damage to the molten metal container and deterioration of the quality of the casting.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of an immersion nozzle device for continuous casting according to an embodiment of the present invention.

2 (a) to (c) are cross-sectional views shown for explaining a casting method by the immersion nozzle device for continuous casting according to the embodiment of the present invention.

FIG. 3 is a sectional view shown for explaining an example of use of a conventional immersion nozzle device for continuous casting.

[Explanation of symbols]

1 trout brick 1a Inlet 1b Outlet 2 base plate 2a through hole 3 plate cassette 3a Upper frame 3b lower frame 3c side frame 4 Upper plate 6 Intermediate plate 6a nozzle hole 6b Shutter section 7 hydraulic cylinder 8 upper nozzle 11 molds 61 Lower plate 63 Immersion nozzle 64 nozzle body 65 Distribution hole 67 nozzles 67a Air release hole A tundish m molten steel

Claims (2)

[Claims] 1. A submerged nozzle device for continuous casting, comprising a submerged nozzle having a through hole for receiving a molten metal from an outlet of the molten metal container and injecting the molten metal into a mold. A nozzle holding plate for moving the submerged nozzle in a direction perpendicular to the opening direction of the outlet, and the nozzle for holding the atmosphere is provided with a nozzle for opening to the atmosphere that can communicate with the outlet. An immersion nozzle device for continuous casting, which is characterized by: 2. A shutter for closing the outlet between the molten metal container and the nozzle holding plate, and a nozzle for introducing molten metal from the molten metal container into the flow hole. The immersion nozzle device for continuous casting according to claim 1, wherein a movable plate having holes is movably arranged.