JP3272639B2 - Tundish equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tundish apparatus in which a dipping nozzle is provided on the bottom surface of a tundish main body, and the molten metal inside the tundish main body is poured from the dipping nozzle into a mold section. The present invention is effective when applied to a twin drum type or twin belt type continuous casting device for continuously casting slabs.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show main parts of a conventional twin-drum type continuous casting apparatus for continuously casting strip-shaped slabs.

As shown in FIGS. 7 and 8, a pair of side dams 2 are provided on both sides of a pair of water-cooled drums 1 at both ends of a pair of water-cooled drums 1 which are rotatably supported in opposite directions by a driving device. It is arranged so that it can slide and vibrate on the surface. Above the water-cooled drum 1, a tundish main body 4 having a submerged nozzle 5 on a bottom surface 4a is disposed. A seal chamber 6 that covers a mold portion 3 formed by the water-cooled drum 1 and the side weir 2 is slidably mounted on the tundish body 4. A gas supply pipe 7 is provided in the seal chamber 6.

In such a continuous casting apparatus, the inert gas 103 is supplied from the gas supply pipe 7 into the seal chamber 6 to block the inside of the chamber 5 from the atmosphere, and the water-cooled drums 1 are driven in opposite directions by a driving device. The molten steel 101 is poured into the mold part 3 from the inside of the tundish main body 4 through the immersion nozzle 5 while rotating, and the molten steel 101 is sent downward while being cooled and solidified by the water-cooled drum 1. The slab 102 is continuously cast.

[0005]

Generally, in an apparatus for continuously casting billets, blooms, slabs, and the like in a fixed-vibration mold section, powder or the like is floated on the molten steel surface in the mold section to remove the molten steel. We are trying to cut off from the atmosphere. Therefore, the bottom surface of the tundish body comes into contact with the atmosphere, is cooled by the atmosphere, and can be maintained at 300 ° C. or lower.

However, in the twin-drum continuous casting apparatus as described above, the lower part of the side surface and the bottom surface 4a of the tundish body 4 are shielded from the outside together with the mold part 3 by the seal chamber 6, so that the mold part 3 due to radiant heat from the molten metal surface 101a of the molten steel 101 in the molten steel 101 and sensible heat of the molten steel 101 in the tundish body 4.
The temperature rises above 00 ° C. For this reason, the steel outer plate lined with the refractory material of the tundish main body 4 causes a reduction in strength and thermal deformation, and the immersion nozzle 5 is inclined so that the molten steel 101 is poured into the mold portion 3 correctly. However, there is a possibility that the strip-shaped slab 102 may have a defect and quality may be deteriorated.

[0007] Such a problem is not limited to the twin-drum type continuous casting apparatus as described above, but also a twin-belt type continuous casting apparatus or the like. A continuous casting apparatus provided with a tundish apparatus for pouring the molten metal inside the dish body into the mold portion can occur in the same manner as described above.

In view of the above, an object of the present invention is to provide a tundish device capable of suppressing a decrease in strength and thermal deformation of a tundish main body.

[0009]

To solve the above-mentioned problems, a tundish device according to the present invention comprises a steel outer plate.
A tundish device provided with a dipping nozzle on a bottom surface of a tundish body lined with a refractory material, and pouring molten metal inside the tundish body from the dipping nozzle into a mold portion, wherein the bottom surface of the tundish body is When
A bottom cooling means is provided between the mold portion and the molten metal surface and cools a bottom surface of the tundish main body.

[0010] In the above-described tundish device, the bottom surface cooling means, and characterized in that it comprises a coolant jacket for circulating cooling medium therein.

[0011] In the above-described tundish device, the bottom surface cooling means, and characterized in that it comprises a refrigerant tube for circulating a cooling medium therein.

Also, a tundish device according to the present invention.
Is equipped with an immersion nozzle on the bottom of the tundish body.
From the immersion nozzle to the inside of the tundish body.
Is a tundish device that pours molten metal into the mold
Thus, the bottom cooling unit is provided on an inner surface of a seal chamber provided between the tundish main body and the mold unit, and includes a refrigerant tube through which a cooling medium flows.
A rejecting means .

Further, a tundish device according to the present invention.
Is equipped with an immersion nozzle on the bottom of the tundish body.
From the immersion nozzle to the inside of the tundish body.
Is a tundish device that pours molten metal into the mold
And a bottom cooling means including a spray nozzle for blowing a cooling gas toward the bottom of the tundish body.
Characterized in that was.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which a tundish apparatus according to the present invention is applied to a twin drum type continuous casting apparatus will be described with reference to FIGS. FIG.
Is a side sectional view showing a schematic structure of a main part thereof, and FIG. 2 is a sectional view taken along line II-II in FIG.

As shown in FIGS. 1 and 2, a pair of side dams 2 are provided on both sides of a pair of water cooling drums 1 at both ends of a pair of water cooling drums 1 which are rotatably supported by driving devices in directions opposite to each other. It is arranged so that it can slide and vibrate on the surface. Above the water-cooled drum 1, a tundish main body 4 having a submerged nozzle 5 on a bottom surface 4a is disposed. A seal chamber 6 that covers a mold portion 3 formed by the water-cooled drum 1 and the side weir 2 is slidably mounted on the tundish body 4. A gas supply pipe 7 is provided in the seal chamber 6.

As shown in FIGS. 1 and 2, a water jacket 11 as a refrigerant jacket is mounted on the bottom surface 4a of the tundish main body 4 so as to penetrate the immersion nozzle 5 therein. The coolant jacket 11 has a water supply pipe 12 and a drain pipe 13 that penetrate the seal chamber 6.
Are connected. Such a water jacket 1
1, a water supply pipe 12, a drain pipe 13 and the like constitute a bottom surface cooling means in the present embodiment.

In such a continuous casting apparatus, the inert gas 103 is supplied from the gas supply pipe 7 into the seal chamber 6 to block the inside of the chamber 5 from the atmosphere, and the cooling medium is supplied from the water supply pipe 12 into the water jacket 11. Cooling water 11
The molten steel 101 is supplied from the inside of the tundish main body 4 through the immersion nozzle 5 while the water-cooled drum 1 is rotated in a direction opposite to each other by a driving device, so that the molten steel 101 is melted. By pouring the molten steel into the part 3 and sending the molten steel 101 downward while being cooled and solidified by the water-cooled drum 1, the strip-shaped slab 102 can be continuously cast.

Here, the water jacket 11 blocks the radiant heat from the molten metal surface 101a of the molten steel 101 in the mold part 3 and the bottom surface 4 of the tundish main body 4 due to the heat.
a, and the water jacket 1
The cooling water 111 flowing through the inside 1 cools the conduction heat from the molten steel 101 in the tundish main body 4 and the radiant heat, so that the steel outer plate lined with the refractory material of the tundish main body 4 has a temperature of 300 ° C. or less. Is held.

Therefore, the inclination of the immersion nozzle 5 can be suppressed by suppressing the strength reduction and thermal deformation of the steel outer plate of the tundish body 4, so that the molten steel 101 can be poured into the mold portion 3 correctly. Slab-like slab 102
Quality can be improved by preventing defects from occurring.

A second embodiment in which the tundish apparatus according to the present invention is applied to a twin drum type continuous casting apparatus will be described with reference to FIGS. FIG. 3 is a side sectional view showing a schematic structure of the main part, and FIG.
FIG. 4 is a sectional view taken along line IV. However, the same parts as those in the first embodiment described above are denoted by the same reference numerals as those used in the first embodiment, and the description thereof will be omitted.

As shown in FIGS. 3 and 4, a water tube 21 as a refrigerant tube is mounted below the bottom surface 4a and the side surface of the tundish body 4 so as to surround the immersion nozzle 5. Water tube 21
Are connected at their ends to headers 24 and 25 disposed in the seal chamber 6, respectively. A water supply pipe 22 penetrating the seal chamber 6 is connected to the header 24, and a drain pipe 23 penetrating the seal chamber 6 is connected to the header 25. In the present embodiment, the water tube 21, the water supply pipe 22, the drain pipe 23, the headers 24 and 25, and the like constitute a bottom cooling unit in the present embodiment.

In such an embodiment, the water tube 21 is connected to the molten metal surface 10 of the molten steel 101 in the mold portion 3.
The radiant heat from 1a is blocked to prevent the bottom surface 4a and the lower side surface of the tundish body 4 from being heated by the heat, and the cooling water 111 flowing through the water tube 21 is removed from the molten steel 101 in the tundish body 4. Of the tundish main body 4 and the lower side surface of the tundish main body 4 by the heat is prevented from being heated by the heat.
It can be kept at a temperature of 0 ° C. or less.

Therefore, similarly to the case of the above-described embodiment, the strength of the steel outer plate of the tundish main body 4 and the thermal deformation can be suppressed, and the inclination of the immersion nozzle 5 can be suppressed. The molten steel 101 can be poured into the casting 3 properly, and the quality of the strip-shaped slab 102 can be improved by preventing the occurrence of defects.

A third embodiment in which the tundish apparatus according to the present invention is applied to a twin drum type continuous casting apparatus will be described with reference to FIGS. FIG. 5 is a side sectional view showing a schematic structure of the main part, and FIG.
FIG. 6 is a sectional view taken along line VI. However, the same parts as those in the first and second embodiments described above are replaced by the first and second embodiments.
The description is omitted by using the same reference numerals as those used in the second embodiment.

As shown in FIGS.
The water tube 3 which is a refrigerant tube is
1 is attached. The water tube 31 is connected to headers 34 and 35 provided outside the seal chamber 6 through nozzles 36 and 37 penetrating the chamber 5. The water supply pipe 32 is connected to the header 34, and the drain pipe 33 is connected to the header 35. In the present embodiment, the water tube 31, the water supply pipe 32, the drain pipe 33, the headers 34 and 35, the nozzles 36 and 37, and the like constitute a bottom cooling unit in the present embodiment.

In such an embodiment, the cooling water 111 flowing through the water tube 31 is
The radiant heat from the molten metal surface 101a of the molten steel 101 in the inside and the conduction heat from the molten steel 101 in the tundish main body 4 are absorbed to prevent the bottom surface 4a and the side surface of the tundish main body 4 from being heated by the heat. The steel outer plate lined with the refractory material of the dish main body 4 can be maintained at a temperature of 300 ° C. or less.

Accordingly, as in the case of the above-described embodiment, the strength of the steel outer plate of the tundish main body 4 and the thermal deformation thereof can be suppressed, and the inclination of the immersion nozzle 5 can be suppressed. The molten steel 101 can be poured into the casting 3 properly, and the quality of the strip-shaped slab 102 can be improved by preventing the occurrence of defects.

Although the cooling water 111 is used as a cooling medium in each of the above-described embodiments, a cooling gas such as a cooling brine or an inert gas may be used as the cooling medium.

In each of the above-described embodiments, the bottom surface 4a and the like of the tundish main body 4 are cooled by flowing a cooling medium such as cooling water 111 through the water jacket 11 and the water tubes 21 and 31. However, for example, it is also possible to provide a spray nozzle which blows a cooling gas such as an inert gas toward the bottom surface 4a of the tundish main body 4 to serve as a bottom cooling means.

In each of the above-described embodiments, the case where the present invention is applied to a twin-drum type continuous casting apparatus is described. However, the present invention is not limited to this. As long as the continuous casting device is provided with a nozzle and provided with a tundish device for pouring the molten metal inside the tundish main body from the immersion nozzle into the mold portion, the present invention is applied in the same manner as in the above-described embodiments. be able to.

[0031]

The tundish device according to the present invention is a tundish device in which a dipping nozzle is provided on the bottom surface of the tundish main body, and the molten metal inside the tundish main body is poured into the mold section from the dipping nozzle. Since there is provided a bottom surface cooling means for cooling at least the bottom surface of the tundish body, the bottom surface cooling means cools radiant heat from the molten metal surface in the mold portion and conduction heat from the molten metal in the tundish body. Prevents heating of the bottom surface of the tundish body due to heat, reduces the strength of the tundish body and suppresses thermal deformation, and suppresses the inclination of the immersion nozzle, so that the molten metal can be poured into the mold part correctly. In addition, it is possible to prevent the occurrence of defects in the strip slab and improve the quality.

Further, if the bottom surface cooling means is provided on the bottom surface of the tundish main body and has a refrigerant jacket for circulating a cooling medium therein, the refrigerant jacket blocks radiant heat from the molten metal surface in the mold portion. In addition to preventing the heating of the bottom surface of the tundish main body due to the heat, the cooling medium flowing in the refrigerant jacket cools the conduction heat and the radiant heat from the molten metal in the tundish main body. Suppression of the strength of the dish body and thermal deformation can be suppressed, the inclination of the immersion nozzle can be suppressed, and the molten metal can be correctly poured into the mold part, thereby preventing the occurrence of defects in the strip slab and improving the quality. .

Further, if the bottom surface cooling means is provided on the bottom surface of the tundish main body and has a refrigerant tube through which a cooling medium flows, the refrigerant tube cuts off radiant heat from the molten metal surface in the mold portion. In addition, since the cooling medium flowing through the refrigerant tube cools the conduction heat and the radiant heat from the molten metal in the tundish main body, the immersion nozzle suppresses the strength reduction and thermal deformation of the tundish main body as described above. Can be suppressed, and the molten metal can be properly poured into the mold portion, thereby preventing the occurrence of defects in the strip-shaped slab and improving the quality.

Further, if the bottom surface cooling means is provided on an inner side surface of a seal chamber provided between the tundish main body and the mold portion and a refrigerant tube for flowing a cooling medium is provided inside, The cooling medium flowing in the tube absorbs the radiant heat from the molten metal surface in the mold portion and the conduction heat from the molten metal in the tundish main body, and prevents the heat below the bottom and side surfaces of the tundish main body due to the heat. Therefore, similarly to the above, it is possible to suppress the decrease in strength and thermal deformation of the tundish main body, suppress the inclination of the immersion nozzle, properly pour the molten metal into the mold portion, and prevent the occurrence of defects in the strip-shaped slab. The quality can be improved.

Further, if the bottom surface cooling means is provided with a blowing nozzle for blowing a cooling gas toward the bottom surface of the tundish main body, the cooling gas from the blowing nozzle prevents heating of the bottom surface of the tundish main body. In the same manner as described above, the strength of the tundish body and the thermal deformation can be suppressed, the inclination of the immersion nozzle can be suppressed, and the molten metal can be properly poured into the mold portion to prevent the occurrence of defects in the strip-shaped slab and the quality. Can be improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a schematic structure of a main part of a first embodiment when a tundish apparatus according to the present invention is applied to a twin-drum continuous casting apparatus.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a side sectional view showing a schematic structure of a main part of a second embodiment when a tundish apparatus according to the present invention is applied to a twin-drum continuous casting apparatus.

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a side sectional view showing a schematic structure of a main part of a third embodiment when a tundish device according to the present invention is applied to a twin-drum continuous casting device.

6 is a sectional view taken along the line VI-VI in FIG. 5;

FIG. 7 is a side sectional view showing a schematic structure of a main part of a conventional twin-drum continuous casting apparatus.

8 is a sectional view taken along the line VIII-VIII in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water-cooled drum 2 Side dam 3 Mold part 4 Tundish main body 4a Bottom surface 5 Immersion nozzle 6 Seal chamber 7 Gas supply pipe 11 Water jacket 12 Water supply pipe 13 Drain pipe 21 Water tube 22 Water supply pipe 23 Drain pipe 24, 25 Header 31 Water tube 32 water supply pipe 33 drain pipe 34,35 header 36,37 nozzle 101 molten steel 101a molten metal surface 102 strip slab 103 inert gas 111 cooling water

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-204806 (JP, A) JP-A-8-108253 (JP, A) JP-A-8-57586 (JP, A) JP-A 9-204 141403 (JP, A) JP-A-4-322873 (JP, A) JP-A-7-60409 (JP, A) JP-A 1-172445 (JP, U) JP-A 2-138048 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B22D 11/10 310 B22D 41/005

Claims (5)

(57) [Claims] 1. A tundish device in which a dipping nozzle is provided on the bottom surface of a tundish main body in which a refractory material is lined with a steel outer plate, and the molten metal inside the tundish main body is poured into the mold section from the dipping nozzle. Oh , the tongue
A tundish device provided with a bottom surface cooling means provided on a bottom surface of a dish body and cooling a bottom surface of the tundish body. Wherein said bottom surface cooling means, tundish according to claim 1, characterized in that it comprises a coolant jacket for circulating cooling medium therein. Wherein the bottom surface cooling means, tundish according to claim 1, characterized in that it comprises a refrigerant tube for circulating a cooling medium therein. 4. An immersion nozzle on the bottom of the tundish body
Is provided, and the tundish book is
Tundish for pouring molten metal inside the body into the mold
An apparatus, comprising: a refrigerant tube provided on an inner surface of a seal chamber provided between the tundish main body and the mold portion, and through which a cooling medium flows .
It features and to filter tundish apparatus further comprising a bottom surface cooling means that. 5. An immersion nozzle on the bottom of a tundish body
Is provided, and the tundish book is
Tundish for pouring molten metal inside the body into the mold
An apparatus for cooling a bottom surface , comprising: a spray nozzle for blowing a cooling gas toward a bottom surface of the tundish body.
It features and to filter tundish apparatus further comprising a stage.