KR20020092517A - apparature for manufacture of ingot used bottom pouring - Google Patents

Abstract

PURPOSE: An apparatus is provided which improves quality of ingot by exhausting the air in a mold or runner with blowing of argon gas through an argon gas blowing pipe and cutting off contact between the air and molten steel, thereby preventing reoxidization of molten steel and cutting off mixing of hydrogen. CONSTITUTION: In an apparatus comprising an ingot mold that is put on a surface table in which a horizontal runner is formed; a molten steel injection pipe(6) which has a vertical runner(5) so that the vertical runner(5) is connected to the horizontal runner; an injection cup(7) that is arranged on the upper part of the injection pipe(6); and a nozzle of ladle which is installed in the upper part of the injection cup(7), and through which molten steel is injected from the ladle into the ingot mold, the apparatus for manufacturing ingot using bottom pouring comprises a cylindrical argon sealing box(13) which is installed between the upper part of the injection pipe(6) and the bottom of the ladle and equipped with an argon gas blowing pipe(11), and the upper central part of which is penetratingly opened, wherein the apparatus further comprises a sight glass(12) which is installed on the side surface of the argon sealing box(13) so that flowing of molten steel can be observed with the naked eye, a penetrated cover(14) put on the upper surface of the argon sealing box(13) is connected to a flexible chain(15), the flexible chain(15) is contacted with the bottom of the ladle with the flexible chain(15) enveloped a nozzle(9a) of the ladle, and the nozzle(9a) is arranged adjacently to the lower part of the argon sealing box(13) and the upper part of the injection cup(7).

Description

Apparatus for manufacture of ingot used bottom pouring}

The present invention relates to an apparatus for manufacturing ingots according to the lowering method, and more particularly, as a medium of a molten steel flow path when injecting molten steel from a ladle to a lower part of an ingot mold. An argon gas sealing box with an argon gas blowing tube and a sight glass is installed on the upper part of the molten steel injection pipe to be used, and argon gas blowing through the argon gas blowing pipe blocks contact between the atmosphere and the molten steel. The present invention relates to an ingot producing apparatus having good quality by blocking hydrogen incorporation.

There are two kinds of methods for injecting molten steel into a steel ingot mold during ingot work. One is top casting (top casting) to inject molten steel into the upper part of the mold through the ladle, and the other is to inject molten steel to the bottom of the mold through the ladle. (Bottom casting, bottom pouring).

Residency law generally has many opportunities for nonmetallic inclusions to be disadvantageous in molten steel. Due to the high injection speed, molten steel or the like scatters on the mold wall, so that the surface of the ingot due to the splash is more defective than the lowering method.

The lowering method is used to overcome the shortcomings of the above-mentioned resident method. When the injection, the flow energy generates a splash because molten steel slowly enters the mold due to a decrease in resistance caused by an injection passage connected to the ladle and the mold and a turbidity. The molten steel does not scatter on the mold wall, so that the surface is good, but there is the possibility of reoxidation by contact with the atmosphere during injection, the problem of hydrogen mixing, and the incorporation of non-metallic inclusions by contact with the injection pipe and softening.

Figure 1 shows a general ingot manufacturing apparatus used to carry out the conventional dripping method. As shown in this figure, the mold 1 is placed on the surface plate 4 including the horizontal raceway 3 on the work floor 2, and the vertical raceway is in communication with the horizontal raceway 3. The injection tube 6 having 5) is connected. And the injection cup (7) is installed above the injection tube (6).

In the above apparatus, when molten steel in the ladle 8 is injected from the sliding gate 9 through the injection cup 7, the molten steel passes through the vertical tap water 5, the horizontal tap water 3, and the mold bottom. Enter 1). After the molten steel enters the mold and completely solidifies, the steel is separated from the mold (1) to obtain a steel ingot.

However, in the above structure, since the sliding gate 9 and the injection cup 7 are separated from each other, the molten steel is mixed with and contacted between the sliding gate 9 and the injection cup 7 of the ladle during molten steel injection. There has been a problem in that a reoxide is generated and remains as an inclusion in the ingot, and the mechanical properties are significantly reduced by incorporation of hydrogen in the atmosphere.

As part of solving the problem, as shown in FIG. 2, a curtain 10 using asbestos silica nonwoven fabric is installed between the bottom of the ladle 8 and the infusion cup 7 to block contact between the atmosphere and molten steel. Although efforts have been made, it is necessary to visually observe the injection state of the molten steel injected into the injection pipe (6), so that the gap between the curtain (10) and the injection cup (7) must be installed to maintain a certain gap in the structure of the molten steel and There is a problem that the quality of the steel is limited because there is a problem that the contact of the atmosphere is inevitable.

The present invention is to solve the above problems, an argon gas sealing box having an argon gas blowing tube and a sight window on the upper portion of the injection tube that is used as a medium path when the molten steel is injected from the ladle to the lower part of the mold. By argon gas blowing through the argon gas inlet pipe to prevent the release of molten steel and the contact of the atmosphere with molten steel, which prevents reoxidation of molten steel and prevention of hydrogen mixing. The purpose is to provide a device that can be improved.

1 is a cross-sectional view of a conventional method of manufacturing ingot method

FIG. 2 is a cross-sectional view of a device with a curtain 10 installed between the injection funnel and ladle of FIG.

Figure 3 is a cross-sectional view of the steel ingot manufacturing apparatus used in the present invention

Explanation of symbols for main parts of the drawings

1: ingot mold 5: vertical passage 6: injection tube 7: injection cup

8: Ladle 9a: Nozzle 11: Argon Gas Blowing Pipe

12: sight window 13: argon gas sealing box 14: cover

15: flexible

In order to achieve the above object, the present invention provides a mold for manufacturing ingot (ingot) is located on the top surface of the horizontal trajectory is installed, the molten steel injection pipe having a vertical trajectory is connected so that the horizontal molten metal is connected, the injection In positioning a ladle having a nozzle for injecting molten steel in the upper portion of the tube, an argon gas sealing box of a cylindrical portion having a through-hole having an argon gas blowing tube between the upper portion of the injection tube and the bottom of the ladle. ) Is installed. And the argon gas sealing box side is made of a separate device provided with a viewing window for observing the injection state of the molten steel.

In addition, the present invention is installed in the upper cover (cover) through the center through the upper part of the sealing box to prevent the shaking of the argon gas sealing box when the molten steel injection from the ladle, the flexible chain is coupled to the cover, The central portion of the chain is arranged on the bottom of the ladle such that a sliding gate with a nozzle is located.

The present invention blows argon gas into the molten steel injection tube through the argon gas blowing pipe attached to the argon gas sealing box located above the molten steel injection tube to block the contact between the atmosphere and the molten steel using the device.

Fig. 3 shows a cross-sectional view of the apparatus used in the present invention. In the present invention, a steel ingot mold 1 is obtained on the upper surface of the surface plate 4 having the horizontal tap water 3 as shown in Fig. 1, and the horizontal tap water ( The structure having the vertical flow rate 5 which can be communicated with 3) is the same.

As shown in FIG. 3, the present invention provides a hollow cylindrical portion provided with an argon gas blowing pipe 11 on an upper surface of an injection pipe 6 having a vertical water flow path 5. An argon gas sealing box 13 is installed. In addition, the present invention is visually check the injection state of the molten steel when the molten steel is injected with the argon gas blown pipe 11 is provided with a sight window 12 for safe operation.

The see-through window 12 is not limited to any shape or any material, as long as it can be a material that can be projected as a form that can be fitted inside the structure having a cylindrical or polygonal shape.

In addition, the present invention, when assembling the argon gas blowing pipe 11 into the argon gas sealing box 13, unlike the FIG. 3, through the argon gas sealing box 13 from the lower position of the end end to be disposed upwards Since it may be, it is not limited to the structural arrangement of FIG.

In addition, although the argon gas blowing pipe 11 is shown in the form assembled with the sight glass 12 in the neighborhood in FIG. 3, this invention can be arrange | positioned in a separate position, regardless of the position.

The present invention can work with the ladle (8) immediately obtained on the upper surface of the argon gas sealing box 13, but the cylindrical cover which is perforated on the upper surface to prevent shaking of the argon gas sealing box (13) during operation (cover) 14 is placed and the flexible chain 15 is connected to the cover 14, and the upper part of the flexible chain 15 and the bottom of the ladle 8 are connected.

In blowing argon gas by using the above device, the argon gas is introduced through the argon gas blowing pipe 11 to lift or lift the cover 14 connected to the ladle 8 and the flexible chain 15 to the upper part. (6) It is blown into the upper part.

The blown argon gas is discharged to the upper side together with the air present in the horizontal bath (3), the vertical passage (5), including the mold (1) to discharge the air in the mold.

When the atmosphere in the mold is discharged as described above, the cover 14 coupled to the flexible chain 11 is assembled with the argon gas sealing box 13, and the argon gas blowing pipe 11 is continuously connected while injecting molten steel by connecting the ladle. Argon gas can be blown in through the gap between the cover (14) and the top of the argon gas sealing box (13) or the gap between the flexible chain (15) and the bottom of the ladle (8). As a result, the air cannot be introduced into the gap and the contact between the air and the molten steel is blocked.

In addition, in the present invention, argon gas may be blown through the argon gas blowing pipe 11 regardless of before or during molten steel injection in a completely assembled state as shown in FIG. 3.

On the other hand, the present invention, when injecting the argon gas in the molten steel injection as described above, the nozzle (9a) of the sliding gate (9) attached to the bottom of the ladle (8) is the argon gas sealing box 13 lower part and the injection cup (7) The molten steel can be injected down to a position adjacent to the molten steel to more easily block the contact between the atmosphere and the molten steel.

As described above, the present invention provides an apparatus having an argon gas sealing box 13 having a viewing window 12 including an argon gas blowing tube 11 between a ladle 8 and an upper portion of a molten steel injection tube 6. By argon gas is injected into the injection pipe 6 through the argon gas blowing pipe 11, the molten steel is regenerated according to the mixing of the atmosphere as the steel ingot is produced while discharging the air present in the mold and the like. The steel ingot of good quality can be obtained by prevention and blocking of hydrogen mixing.

Claims (4)

An ingot mold 1 is placed on a surface plate 4 on which a horizontal trajectory 3 is formed, and a molten steel injection tube 6 having a vertical trajectory 5 is connected in communication with the horizontal trajectory 3. In the apparatus for injecting molten steel through the injection nozzle (7) is disposed above the injection tube, the upper portion of the injection tube, the argon gas blowing pipe between the upper portion of the injection tube 6 and the bottom of the ladle Argon gas sealing box (13) of the through-cylindrical portion provided with the (11) is provided, the manufacturing apparatus of the ingot (ingot) characterized in that it is installed. According to claim 1, The argon gas sealing box (13) side of the manufacturing apparatus of the steel ingots, characterized in that provided with a see-through window 12 for visually observing the flow of molten steel. The method of claim 1, The cover 14, which is perforated on the upper surface of the argon gas sealing box 13, is combined with the flexible chain 15 to be loaded. The flexible chain 15 surrounds the nozzle 9a of the ladle, Apparatus for producing steel ingots using an inlet method characterized in that the bottom portion is in contact. The method of claim 1, The nozzle (9a) is an argon gas sealing box (13) the lower portion and the injection cup (7) the manufacturing apparatus of the steel ingot using the method of the ingot characterized in that disposed close to the top.