JPH0428685Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a tundish heater for continuous casting that has an improved joint structure between a molten metal holding chamber and a heat generating chamber.

(Prior art) Generally, when continuously casting billets, the molten metal melted in a melting furnace is first received in a tundish, and from there it is simultaneously poured into multiple ring-shaped water-cooled molds to continuously cast long billets. It is being done.

However, in recent years, as continuous casting lines have become larger, if a large amount of molten metal is stored in the tundish, the temperature of the molten metal will drop and the appropriate casting temperature cannot be maintained, so induction heating tundish heaters have been used. The temperature of molten metal is raised by attaching it.

The structure of a conventional continuous casting tundish equipped with such a tundish heater is, for example, as shown in FIG.

The tundish 1 has a crucible-shaped molten metal holding chamber 3 formed inside thereof with a refractory material 2, and an opening 4 on the side thereof. A tapping nozzle 5 is formed at the bottom or lower side of the molten metal holding chamber 3 .

6 is a tundish heater, heating coil 7
A horizontal crucible-shaped heating chamber 8 is formed inside of the refractory material 2, and an opening 9 of this heating chamber 8 communicates with the opening 4 of the molten metal holding chamber 3.

Tandite dish 1 and tandate dish heater 6
, the flanges 11a, 11b at the joint 10
are integrally joined by.

The molten metal 12 stored in the molten metal holding chamber 3 is inductively heated by a heating coil 7 in a heat generating chamber 8, and stirred and convected to heat and raise the temperature of the entire molten metal.

When the tundish heater 6 is operated for a long period of time in this way, the refractory material 2 forming the heat generating chamber 8 gradually wears out due to stirring of the molten metal 12. If the refractory material 2 becomes thin, there is a risk of water leakage, so the condition of the refractory material 2 should be inspected and repaired periodically to prevent accidents and extend the service life of the refractory material 2. is being extended.

When carrying out this periodic inspection or repair, first, the entire amount of molten metal 12 in the molten metal holding chamber 3 and heating chamber 8 is tapped out,
After cooling, the bolts of the flanges 11a and 11b are removed, the joint 10 is peeled off, and the tundish heater 6 is separated from the tundish 1.

However, when pouring out the entire amount of molten metal 12, the bottom of the heat-generating chamber 8 is almost horizontal due to the slope of the cutting die during furnace construction, and the molten metal 12 whose temperature has decreased has increased viscosity, so The molten metal is not completely discharged and remains as a residual metal 12a from the bottom of the heat generating chamber 8 to the bottom of the molten metal holding chamber 3, as shown in FIG. Particularly in the case of non-ferrous metals such as copper alloys, the amount of remaining hot metal is large.

This remaining hot water 12a solidifies and the metal solidified layer 12b sticks to the upper part of the joint 10, making it extremely troublesome to peel off the joint 10 and separate the tundish heater 6 from the tundish 1. .

If you try to forcefully separate this, as shown in FIG.
2b, and the repair area expanded to include the tundish 1 side, and in some cases, the furnace had to be rebuilt.

(Problems to be solved by the invention) The present invention eliminates the above-mentioned drawbacks, and makes it easy to separate the tundish dish and the tundish heater.
Moreover, it is an object of the present invention to provide a tundish heater for continuous casting that prevents damage to the refractory material during separation and facilitates inspection and repair.

[Structure of the invention] (Means for solving the problem) The present invention uses a thick refractory material at the joint between the heat generating chamber of the tundish heater and the molten metal holding chamber of the tundish which communicates with the heat generating chamber of the tundish heater. It is characterized by being integrally joined with a ring interposed therebetween.

(Function) To explain the function of the tundish heater for continuous casting of the present invention, a thick-walled refractory is used at the joint between the heat generating chamber of the tundish heater and the molten metal holding chamber on the tundish side that communicates with the heating chamber of the tundish heater. Because the ring is interposed, during regular inspections and repairs,
First, the thick refractory ring is broken from the outer periphery to expose the solidified metal layer at the joint, and then the solidified metal layer is melted and ruptured to facilitate separation. This can prevent damage to the refractory material that forms the chamber.

(Examples) Hereinafter, the present invention will be described in detail with reference to examples shown in the drawings.

Figures 1 and 2 show an embodiment of the present invention, in which a tundish 1 has a refractory material 2 inside it.
A crucible-shaped molten metal holding chamber 3 is formed, an opening 4 is provided on the side surface thereof, and a melt nozzle is formed on the bottom or lower side surface.

A tundish heater 6 is integrally joined to the side of the tundish 1. This tundish heater 6 has a heating coil 7 wound around it inside, and a horizontal crucible-shaped heating chamber 8 is formed inside the heating coil 7 with a refractory material 2, and an opening 9 of this heating chamber 8.
is in communication with the opening 4 of the molten metal holding chamber 3.

13 is a refractory ring 1 that is thick, for example, about 50 to 60 mm, and is made of fired brick that is weak against impact.
3, as shown in FIG. 2, three fan-shaped ring pieces 13a... are combined into a ring shape and are interposed at the joint 10 between the tundish dish 1 and the tundish heater 6. .

The outer periphery of this refractory ring 13 is supported at intervals by six semi-flanges 14 attached to the flange 11a on the tundish heater 6 side.

Further, the tundish 1 and the tundish heater 6 have flanges 11a and 1 at their joint 10.
1b.

In the continuous casting tundish heater having the above structure, when the tundish heater 6 is separated for periodic inspection or repair, the entire amount of molten metal 12 is tapped out in advance, but the molten metal 12 becomes viscous when the temperature drops. becomes larger and remains as residual metal 12a from the bottom of the heat generating chamber 8 to the bottom of the molten metal holding chamber 3. When the remaining hot water 12a cools down, a solidified metal layer 12b is stuck to the joint 10.

After this, the outer periphery of the refractory ring 13 is broken by hitting it with a hammer or the like through the gap between the semi-flanges 14.
The solidified metal layer 12b of the joint portion 10 is exposed.

Next, an air lancer is inserted through the gap between the joints 10, and the exposed metal coagulation layer 12b is fused with an arc. Next, by removing the bolts on the flanges 11a and 11b, the tundish heater 6 can be easily separated from the tundish 1.

Note that the metal coagulation layer 1 remaining at the bottom of the heat generating chamber 8
2b is after separating the tundish heater 6.
Can be easily peeled off.

In the above embodiment, the refractory ring 13 is divided into three parts, but the refractory ring 13 may be divided into two parts, four parts, or an integral ring shape. Similarly, the number of semi-flanges 14 can be arbitrarily selected.

Furthermore, the present invention can be applied not only to tundish heaters but also to the joint structure of a pot (channel) type holding furnace provided with a molten metal holding chamber and a heat generating chamber.

[Effects of the invention] As explained above, according to the invention, a thick refractory ring that is weak against impact is interposed at the joint between the heat generating chamber and the molten metal holding chamber communicating therewith. When inspecting or repairing, first break the thick refractory ring from the outer periphery to expose the solidified metal layer at the joint, then melt and cut this solidified metal layer to easily remove the refractory material without damaging it. A tundish heater for continuous casting that can perform separation work can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing a tundish heater for continuous casting according to an embodiment of the present invention, FIG. 2 is a view taken along the line A-A in FIG. 1, and FIG. FIG. 4 is a longitudinal sectional front view showing the dish heater in a separated state. 1... Tanditetsu, 2... Fireproof material, 3...
Molten metal holding chamber, 4, 9... Opening, 6... Tundish heater, 7... Heating coil, 8... Heat generating chamber, 10... Joint portion, 12... Molten metal, 12a
... Remaining metal, 12b ... Metal solidified layer, 13 ... Refractory ring, 14 ... Semi-flange.

Claims (1)

[Scope of utility model registration request] A tandy for continuous casting, characterized in that a thick refractory ring is interposed at the joint between a heat generating chamber of a tandish heater and a molten metal holding chamber of a tandish that communicates therewith. Tsushiyu heater.