JPH0424144B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a casting apparatus, and particularly to a casting apparatus that can significantly improve the composition of molten metal, the uniformity of temperature distribution, and the cleaning effect.

[Conventional technology and problems] For example, in continuous copper casting equipment, a holding furnace is installed between the melting furnace and the casting machine, and controls the temperature of the molten metal, refines it by degassing, and adjusts the amount of tapped metal. It's summery.

A smaller holding furnace is better for temperature control and refining, but a larger holding furnace has more room and is easier to adjust the amount of hot water. .

However, in recent years, in order to take advantage of mass production, there has been a tendency to focus on adjusting the amount of hot water, and furnace designs have become larger. As furnaces become larger in size, the flow path of the molten metal within the furnace, especially within the holding furnace, becomes limited, and the flow path becomes relatively smaller when viewed from the inside of the furnace as a whole, resulting in the so-called death of the molten metal. This results in an expansion of the area.
If this happens, the temperature and composition distribution of the molten metal in the furnace will become uneven, and there is a risk that cleaning of the molten metal, such as degassing, will also become uneven.

[Object of the Invention] The present invention has been made in view of the above-mentioned circumstances, and particularly provides a casting method that can fully achieve the purpose even when the holding furnace for temperature control and refining becomes larger. The aim is to provide equipment.

[Summary of the Invention] In other words, the gist of the present invention is to provide a weir for varying the flow of molten metal in the holding furnace of a casting device, thereby localizing the flow path of the molten metal. By preventing the formation of dead zones in the molten metal, it is possible to achieve uniform temperature and composition distribution of the molten metal in the furnace.

[Example] Hereinafter, the description will be given one by one based on examples.

Here, as an example, a holding furnace in a copper continuous casting apparatus will be explained as a specific example, but this does not mean that the present invention is limitedly applied only to such a casting apparatus, and a holding furnace with a similar configuration may be used. Needless to say, it is widely applicable to casting apparatuses having the following methods.

Figure 1 shows a cylindrical suction degassing device 4 that the applicant had already proposed (specifically,
61667) FIG. 2 is an explanatory plan view showing the vicinity of the holding furnace 1 of a copper continuous casting apparatus in which two units are installed in the holding furnace 1, and FIG. It is a sectional view for explaining a figure.

In Figures 1 and 2, 2 is a transfer gutter through which the molten metal 6 is transferred from the melting furnace to the holding furnace 1, 3 is a casting gutter through which the molten metal 6 is sent from the holding furnace 1 to the casting machine, and 4
is the above-mentioned degassing device, and the cleaning effect is enhanced by alternately performing degassing using two units.

In the case of the above configuration, the molten metal flowing from the transfer gutter 2 to the casting gutter 3 via the holding furnace 1 tends to accumulate in the corners of the holding furnace 1 and around the cylindrical degassing device 4, and the temperature and composition described above tend to accumulate. Therefore, it is easy to form non-uniform portions in the distribution.

FIG. 3 is an explanatory plan view of a casting apparatus according to the present invention in which a weir 5 is provided on the casting trough 3 side in the holding furnace 1 in order to prevent the molten metal from stagnation as described above. Components having the same reference numerals as those in the drawings indicate the same configurations.

For such weir 5, it is preferable to use a refractory material that does not react with the molten metal, such as carbon, processed into a flat plate shape.

FIG. 4 is an explanatory sectional view for explaining the configuration shown in FIG. 3, and particularly shows the arrangement of the weir 5. FIG.

It has been confirmed through demonstration tests that by arranging the weir 5 as described above in the holding furnace 1, the flow path of the molten metal is changed and the stagnation of the molten metal described above is largely eliminated.

It goes without saying that the position and shape of the weir 5 have optimal conditions depending on the size and shape of the furnace, as well as other factors. Therefore, the weir 5 is designed to be suspended from the top of the furnace, and the weir 5 can be adjusted as necessary. It is preferable that the position and the angle with respect to the flow of the molten metal be made variable by electric power, hydraulic pressure, or the like.

FIG. 5 shows a case where a weir 5 is provided at the position shown in FIG. ) and a case where degassing was performed in the same manner as in the conventional example shown in FIG. In this experiment, 8 tons/
In the holding furnace where the molten metal flows for hours, every 2 minutes
The results are shown after degassing 0.5 tons of molten metal and sampling every 30 seconds at the inlet of the casting trough.

Before installing weir 5 (without weir), the hydrogen concentration fluctuated from about 0.15ppm to about 0.5ppm in terms of the degassing cycle, but with weir 5, it changed from about 0.2ppm to about 0.35ppm. , the fluctuation was extremely small, clearly indicating that the molten metal itself had become homogenized.

[Effects of the Invention] As is clear from the above, according to the casting apparatus according to the present invention, a weir can be provided at an appropriate position of the holding furnace to cause fluctuations in the flow path of the molten metal, so that the holding furnace can be used in a large size. This method eliminates the formation of dead zones in the molten metal and the stagnation of the molten metal even when the molten metal is heated, and not only can the temperature and composition distribution of the molten metal be made uniform, but also the addition of alloying components and degassing in the holding furnace can be prevented. Even when casting, the segregation of alloy components and the heterogeneity of degassing can be eliminated by using the casting apparatus according to the present invention, and with the development of science and technology, large quantities of high-quality metal materials are being required. As a timely proposal today, the present invention has great significance.

[Brief explanation of drawings]

FIG. 1 is an explanatory plan view showing the vicinity of a holding furnace of a conventional casting device, FIG. 2 is an explanatory sectional view showing the configuration of FIG. 1, and FIG. 3 is a holding furnace of a casting device according to the present invention. FIG. 4 is an explanatory plan view showing the vicinity of the furnace, FIG. 4 is an explanatory sectional view showing the configuration of FIG. 3, and FIG. FIG. 1... Holding furnace, 2... Transfer gutter, 3... Casting gutter, 5... Weir, 6... Molten metal.

Claims (1)

[Scope of Claims] 1. A casting device comprising a weir for changing the flow direction of molten metal on the casting gutter side in a holding furnace of the casting device. 2. The casting apparatus according to claim 1, wherein the weir is configured so that its position and angle can be changed.