KR20030054277A - Ladle for clean cast - Google Patents

Abstract

PURPOSE: A dam type ladle which minimizes oxidation due to oxygen in the atmosphere, and to which a bubbling unit for floating nonmetallic inclusions is attached is provided. CONSTITUTION: As a ladle that is a container used to inject molten metal into mold(2) by receiving molten metal(1) in foundry, the ladle for manufacturing high cleanliness casting product comprises a sealing cover(3) comprising pipes which are installed in opened upper part of the main body to prevent formation of oxides by blocking injected molten metal(1) from the atmosphere, and on the inner circumferential surface of which a plurality of ejection holes are formed to eject inert gas for sealing the circumference of the ladle, and a pipe(5) for directly supplying an inert gas onto the surface of the molten metal(1); a porous plug(11) installed on the lower bottom of the main body to float nonmetallic inclusions by generating inert gas bubbles(10) into the molten metal; a dam(9) installed at the side of tap hole of the main body to guide tapping of cleaned molten metal in the lower part of the ladle in the sealing and bubbling completed molten metal(1); and a stopper(7) installed in the tap hole so that the stopper is put into the tap hole during sealing and taken out of the tap hole during tapping, wherein the ladle further comprises a clip(8) used to increase cohesive force therebetween when sealing the sealing cover(3) onto the main body.

Description

Ladle for manufacturing high clean castings

The present invention relates to a ladle (ladle) used to receive the molten metal in a foundry, more specifically, to minimize the oxidation by oxygen in the atmosphere, a dam (dam) attached to the bubbling device for the separation of non-metallic inclusions It is about a type ladle.

In general, a ladle, which is a container used to receive a hot melt in a foundry and injects it into a mold, has a simple shape as shown in FIG. 1. It will always be exposed to the atmosphere.

Thus, the hot melt reacts with oxygen and dissolved oxygen in the atmosphere to produce nonmetallic inclusions and oxides, where the nonmetallic inclusions and oxides remain in the molten metal 1, which is injected into the mold 2. It is made into a casting product.

When the casting product is manufactured by using the existing ladle exposed to the molten steel in the air as described above, the slag is formed by using a slag treatment agent, and a dam is formed in the ladle to make pure molten metal at the bottom of the molten metal. Even if injected into the mold 2, some non-metallic inclusions and oxides are always present in the product, and when these non-metallic inclusions and oxides are large, they act as a serious defect of the casting product.

The present invention was devised to solve the above problems, to minimize the content of non-metallic inclusions and oxides generated in the existing ladle, to minimize the contact with oxygen in the atmosphere, and to separate the generated non-metallic inclusions The object of the present invention is to provide a ladle for bubbling to facilitate injury and to install a dam in the ladle spout to manufacture a high-clean casting.

Other objects and advantages of the invention will be described below and will be appreciated by the practice of the invention. Furthermore, the objects and advantages of the present invention can be realized by means and combinations indicated in the appended claims.

1 is a schematic diagram of a conventional ladle (a is normal, b is when molten metal is injected into the mold).

Figure 2 is a side cross-sectional view of the ladle according to the invention (a is normal, b is when pouring molten metal in the mold).

3 is a view showing a sealing cover for the ladle according to the present invention, (a) is a plan view, (b) is a sectional view.

Figure 4 is a graph showing the comparison with the oxygen content of the cast product operated using the ladle according to the prior art and the present invention.

Figure 5 is a graph showing the comparison of the non-metallic inclusion content for the cast product operated using the ladle according to the prior art and the present invention.

<Description of the symbols for the main parts of the drawings>

1: molten metal 2: mold

3: sealing cover 4: sealing gas supply coupling

5: molten metal surface anti-oxidation gas supply coupling

6: refractory 7: stopper

8: clip 9: dam

10: inert gas bubble

11: porus plug 12: sealing pipe

13: piping hole for sealing

Ladle for manufacturing a high-clean cast of the present invention for achieving the above object, as a ladle (ladle) is a container used to receive the molten metal (1) in the foundry to inject into the mold (2), the opening of the body It is provided in the upper portion, to block the injected molten metal (1) from the atmosphere, to prevent the production of oxide, and to inject the inert gas for sealing around the ladle through a plurality of injection holes 13 provided in the inner circumferential direction A sealing cover 3 having a pipe 4 and 12 therein and a pipe 5 for supplying an inert gas for oxidation prevention directly to the surface of the molten metal 1; A porous plug 11 provided at the bottom of the main body to generate inert gas bubbling into the molten metal 1 to separate and injure the non-metallic inclusions; A dam (9) provided at the tap-hole side of the main body to guide the clean-up molten metal of the lower part of the molten metal (1) in which sealing and bubbling are completed; A stopper (7) provided in the tapping hole, which is sealed when sealing and is opened when tapping; It includes.

Preferably, when sealing the sealing cover (3) to the main body, the clip (8) used to increase the adhesion; It may further include.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, a molten metal 1 is injected into a ladle body, which is a container, and a sealing cover which prevents oxide generation by blocking the injected molten metal 1 from the atmosphere in the upper opening of the main body. (3) is provided to seal the main body, and the inside of the sealing cover (3) is filled with a refractory (6).

As shown in Fig. 3, the sealing pipe 12 provided inside the sealing cover 3 filled with the refractory 6 uses a stainless pipe having a diameter of 10 to 15 mm so as to seal around the ladle. The sealing gas supply coupling 4 is installed on the cover 3.

At this time, the pipe is provided with a hole 13 having a diameter of 5 to 10mm at least 100 to 120mm intervals, to enable the sealing by injecting an inert gas around the ladle.

Here, when the hole size and spacing of the sealing pipe is larger or smaller than the above range, an appropriate sealing effect around the ladle cannot be expected.

In order to supply an inert gas directly to the surface of the molten metal 1, a molten metal surface anti-oxidation coupling 5 is provided on the upper portion of the cover 3, so that the molten metal 1 is oxidized in contact with oxygen. To be suppressed.

In addition, in order to increase the adhesive force between the sealing cover 3 and the ladle main body, it is sealed at the time of sealing using a clip 8, and the stopper 7 is provided with a stopper 7 to seal it during sealing.

In addition, the bubbling device at the bottom of the ladle generates an inert gas bubble 10 in the molten metal 1 using a porus plug 11 to separate the generated non-metallic inclusions. The surroundings are filled with refractory (6) and constructed.

At this time, the outer diameter of the porous plug 11 is about 30% of the outer diameter of the lower ladle in consideration of the separation of the non-metallic inclusions and its efficiency.

That is, when the outer diameter of the porous plug 11 exceeds 30% of the outer diameter of the lower part of the ladle, the bubbling becomes large, and there is a fear of reoxidation of the molten metal. When the outer diameter of the porous plug 11 is less than 30%, the effect of bubbling is weak, which is not preferable.

Then, a dam 9 is provided on the tap-hole side of the ladle main body, and the high clean lower molten metal in which sealing and bubbling are completed can be tapped and injected into the mold 2.

The action of the ladle for manufacturing a high-clean cast according to the present invention described above, in order to maximally suppress the formation of oxides and non-metallic inclusions by the high temperature molten metal (1) tapping out of the high-frequency induction furnace reacts with oxygen in the atmosphere Using a sealing cover (3), and spraying an inert gas to seal, at the same time bubbling at the bottom to separate and float the non-metallic inclusions, to minimize the non-metallic inclusions and oxides in the molten metal, and then installed in the ladle Due to the dam 9, the molten lower portion of the molten metal is tapped to produce a high-clean casting.

Hereinafter, an embodiment of the present invention will be described, the oxygen content and the product for the high chromium cast iron melted product using a high frequency induction furnace, and then operated by using a ladle improved according to the prior art and the present invention, respectively Nonmetallic inclusion content was measured.

Referring to FIG. 4, which is a graph comparing the total oxygen content of the measurement results, it can be seen that the oxygen content of the ladle improved according to the present invention is significantly lower than that of the conventional ladle exposed to the atmosphere. have.

And, referring to Figure 5 showing the measurement results of the non-metallic inclusions, it can be seen that also the results of the non-metallic inclusions in the casting product is significantly lower than the conventional ladle according to this result.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

According to the ladle for the production of high-clean casting of the present invention, by suppressing the incorporation of oxides and non-metallic inclusions in the production of casting products to the maximum, by minimizing the cause of defects in casting products, it is possible to manufacture a product of excellent quality.

Claims (2)

As a ladle (ladle) which is a container used to receive the molten metal (1) in the foundry factory and inject it into the mold (2), The inert gas for sealing around the ladle is provided in the opened upper part of the main body to block the injected molten metal 1 from the atmosphere, thereby preventing the generation of oxide, and through the plurality of injection holes 13 provided in the inner circumferential direction. Sealing cover (3) having a pipe (4, 12) for spraying the inside and the pipe (5) for directly supplying the oxidation inert gas to the surface of the molten metal (1); A porous plug 11 provided at the bottom of the main body to generate inert gas bubbling into the molten metal 1 to separate and injure the non-metallic inclusions; A dam (9) provided at the tap-hole side of the main body to guide the clean-up molten metal of the lower part of the molten metal (1) in which sealing and bubbling are completed; A stopper (7) provided in the tapping hole, which is sealed when sealing and is opened when tapping; Ladle for manufacturing a high-clean casting comprising a. The method of claim 1, A clip (8) used to increase the adhesion when sealing the sealing cover (3) to the main body; Ladle for manufacturing a high clean casting further comprising.