JPS63256240A - Method for continuous casting metal - Google Patents

Abstract

PURPOSE:To prevent the development of flash in an ingot by pouring molten metal into a mold,heating upper face of the molten metal and upper face of the mold and next blowing cold blast to four corners in the mold to solidify the upper face of the molten metal. CONSTITUTION:Triangle plate 3 is arranged to each gap between the molds 4, which stand in row and are connected with plural pieces, and a circulating chain device for shifting the molds 4 is arranged. At first, the molten metal 5 is poured to each mold 4, which comes to as shifting, through the triangle plate 3. Next, the upper face of the molten metal 5 in the mold 4 and the upper face of the molds 4 are heated by a burner 9 and metal solidified at the upper face and side face of the mold 4 and surface of the triangle plate 3 is remelted. After that, the four corners of the mold 4 are cooled by cold blast from a pipe 13 and cooled by air from a pipe 14 and at last, the molten metal 5 in the mold 4 is solidified by water cooling. As the molten metal 5 stuck and solidified to the mold 4 is remelted and overlapping can be prevented, the development of the flash in the ingot can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a continuous metal casting method for continuously casting metal molds using a plurality of molds.

[Prior Art] In a conventional continuous metal casting method, first, a plurality of molds each having a triangular plate between them are transported by a rotating chain,
Casting is performed by injecting molten metal into each mold. After this casting has been completed, each mold is further transported and air-cooled, and in this state the hot water in each mold solidifies to some extent. Furthermore, after this air cooling, water cooling was performed to completely solidify the molten metal and continuous mold casting was performed.

[Problems to be Solved by the Invention] However, when casting is performed by the above-mentioned method, the JIt
There was a problem in that burrs 2 were formed on the surface of the molded mold 1.

(1) When molten metal is poured into the mold, the metal scatters in a mist and solidifies.

(2) Molten metal that adheres to the triangular plate and the top and side surfaces of the mold during pouring solidifies and remains.

(3) When the mold is moved, the molten metal in the mold splashes, especially while being sent from the casting process to the air cooling process. This causes what is called "gaburi".

When burrs 2 were formed on the surface of the ingot 1, the shape of the ingot 1 was not constant in this state, and an ingot 1 having a desired shape could not be obtained. For this reason, it was necessary to remove the burr 2 and shape the ingot 1 in a subsequent process.

Therefore, the present invention has been made in view of the above circumstances, and it is possible to obtain a mold of a desired shape without forming a burr on the surface of the molded mold, and also to reduce the process of removing the burr, thereby saving labor. The purpose of the present invention is to provide a continuous metal casting method that allows for continuous casting of metal.

Means for Solving Problem E 1 Therefore, in order to achieve the above object, the continuous metal casting method according to the present invention includes: after pouring molten metal into a mold, heating the upper surface of the hot water in the mold and the upper surface of the mold; The feature is that cold air is then blown into the four corners of the mold to solidify the top surface of the hot water.

[Function] In the continuous metal casting method according to the present invention, by heating the upper surface of the hot water in the mold and the upper surface of the mold after pouring the molten metal into the mold, the metal adheres to the upper surface and side surfaces of the mold and the surface of the triangular plate during pouring. The solidified metal is melted and poured into a mold. Additionally, after heating, cold air is blown onto the four corners of the mold to solidify the top surface of the mold, which prevents it from coming loose during movement.

[Example] Hereinafter, a continuous metal casting method according to the present invention will be explained based on the drawings.

FIG. 1 is a side view showing a schematic structure of a continuous metal casting apparatus to which the method of the present invention is applied, and FIG. 2 is a plan view of the apparatus.

The metal continuous casting apparatus according to this embodiment has triangular plates 3 (omitted in FIG. 2) between each, and a plurality of aligned and connected molds 4 are moved by a rotating chain (not shown), which will be described in detail below. A mold casting 1 having a desired shape is continuously cast through the casting process, surface melting process, slag removal process, cold air cooling process, air cooling process, and water cooling process described above.

In the casting process, molten metal, e.g.
Molten lead 5 at 00℃ is poured.

This casting process is carried out in a hood 6, and the molten lead 5 is supplied from the outside into the tank 8 by a metal pump 7, and a constant amount of molten lead 5 is always spouted from the spout 8a of the tank 8. , is injected into each mold 4 via the triangular plate 3.

Each mold 4 into which the molten lead 5 has been cast is then sent to the next surface melting step. In this surface melting process, the upper surface of the lead bath in the mold 4 and the upper surface of the mold 4 are heated by a burner 9, and the molten lead 5 supplied from the spout 8a during casting may scatter from the surface of the mold 4, causing 4 top and side surfaces;
Further, when the molten lead 5 is injected into the mold 4, the lead 5a that has adhered to the surface of the triangular plate 3 and solidified is melted again. The burner 9 is equipped with two pipes 10 that extend in a direction perpendicular to the direction of movement of the mold 4 (the direction of the arrow in FIG. 1) and are arranged in parallel. A plurality of injection ports 10a are formed at positions corresponding to. This burner 9 has LPG (Liquefied P
A burner (etroleum gas) is used, and the flame ejected from the injection port 10a by burning the gas removes the lead 5a attached to the mold 4 and the triangular plate 3 to aOO℃.
It is heated before and after to melt it again. And burner 9
The lead 5 melted by this flows into the mold 4. Incidentally, since the attached lead 5a has a low melting point, it can be easily melted at the temperature of the burner 9.

When the surface melting process is completed, each mold 4 is then sent to a slag removal process. In this slag removal process, slag such as dust floating on the surface of the hot water of each mold 4 is manually removed with one side of the mold 4 supported by the dry flow prevention plate 11. At this time, the flow-off of the hot water due to removal of the top slag can be prevented by the dry flow prevention plate 11. Incidentally, since this slag removal is performed by a person, the space from the burner 9 is partitioned off by a flame shield plate 12.

When the slag removal is completed, each mold 4 is sent to a cold air cooling process. In this cold air cooling step, the surface of the hot water in each mold 4 is forcibly cooled by blowing cold air. The cold air flows through a pipe 1 installed in a direction perpendicular to the direction of movement of the mold 4.
The four corners of the mold 4 are forcibly cooled to about -20 to 0.degree. C. to solidify the surface of the hot water, thereby preventing gabbiness that occurs during movement.

When this cold air cooling process is completed, each mold 4 is then sent to an air cooling process. In this air cooling step, the mold 4 whose surface is solidified is further cooled by air to solidify the inside of the hot water. Note that in this state, the hot water has not yet completely solidified. Also, the temperature of the air here is 2
The temperature is 0° C. or lower, and the water is supplied to every corner of each mold 4 from the Suita mouth 14a of a plurality of connecting pipes 14 arranged in parallel in a direction perpendicular to the direction of movement of the molds 4.

Once the air cooling process is completed, each mold 4 is then sent to a water cooling process. In this water cooling process, water is supplied to the molds 4 that are successively moved to cool them, and the hot water in the molds 4 is completely solidified. This water cooling process is performed in the hood 15, and a constant amount of water is always supplied onto the mold 4 from the plurality of nozzles 16a of the water conduit I6 provided perpendicular to the moving direction of the mold 4. It has become.

Then, the mold lead 1 formed by the mold 4 is taken out from the mold 4 that has gone through each of the above steps in the next step. The mold lead 1 taken out is shown in FIG. 3(a).

As shown in (b), there is no burr 2 on the surface, and the outer shape is changed and constant compared to the conventional one, and it is molded into a desired shape. Furthermore, since there is no burr 2 on the molded lead 1, it is not necessary to remove the burr 2 as in the conventional method, thereby saving labor.

Incidentally, in the above-described embodiment, lead is used for the molten metal 5 cast into the mold 4, but the lead is not limited to this as long as it is a metal with a low melting point.

[Effect of the Invention J As explained above, the continuous metal casting method according to the present invention has the advantage that ingots having a desired shape can be continuously cast without forming any cracks on the surface.

In addition, since no cracks occur in the molded ingot,
It is possible to reduce the work of removing the paris, which was conventionally done in rows 7, and to save labor.

[Brief explanation of the drawing]

The IT diagram is a side view showing a schematic structure of a metal continuous casting apparatus to which the continuous metal casting method according to the present invention is applied, FIG. 2 is a plan view of the same apparatus, and FIG. 3(b) is a side view of the same, FIG. 4(a) is a plan view of the molding cast by the conventional method, and FIG. 4(b) is a plan view of the molding cast by the conventional method. It is the same side view. 1.-ingot, 4.-mold, 5.-molten metal, 9.-
- burner, 13- tube.

Claims (1)

[Claims] A continuous casting method for metals, which after pouring molten metal into a mold, heats the upper surface of the molten metal in the mold and the upper surface of the mold, and then blows cold air to the four corners of the mold to solidify the upper surface of the molten metal. Continuous casting method.