KR20200140615A - Casting apparatus and casting method - Google Patents

Abstract

The present invention relates to a casting apparatus and a casting method, wherein the casting method includes the following steps of: injecting molten steel into a mold; casting a cast piece by solidifying the molten steel and drawing the cast piece from the mold; finishing the injection of the molten steel; and flattening an end portion of the cast piece in the mold, thereby reducing the occurrence of internal defects at the end portion of the cast piece.

Description

Casting apparatus and casting method TECHNICAL FIELD

[0001] The present invention relates to a casting apparatus and a casting method, and more particularly, to a casting apparatus and a casting method capable of reducing defects at an end portion of a cast steel.

In general, continuous casting is a process of continuously injecting molten steel into a mold and continuously drawing the molten steel whose surface is solidified in the mold to the lower side of the mold to manufacture cast pieces of various shapes such as slabs, blooms, billets, and the like.

At the end of the casting of continuous casting, the injection of molten steel supplied to the mold is terminated, and accordingly, the end portion of the cast iron that is solidified and produced in the mold is formed. An accident occurs due to the unsolidified molten steel inside the cast iron. Therefore, at the end of casting, when the distal end of the cast steel is pulled out of the mold, the pulling of the cast steel is temporarily stopped and the unsolidified molten steel at the distal end of the cast is sufficiently solidified to prevent accidents.

However, while the distal end of the cast is pulled out of the mold and stagnated, the distal end of the cast is the top of the non-solidified molten steel in the inner region of the cast due to the cooling capacity of the mold and the contact with the atmosphere. The unsolidified molten steel in the section) is pre-solidified, and then the unsolidified molten steel inside the cast steel is solidified. Accordingly, internal defects such as pipes that are depressed by solidification and contraction are generated inside the distal end of the cast steel. The end portion of the cast iron with internal defects is cut after continuous casting is completed and processed into scrap. However, as the length of the pipe increases, the length of the distal end portion of the cast steel to be cut increases. As a result, the error rate of the cast steel decreases, and the manufacturing cost increases.

KR 10-0605680 B KR 10-1642905 B

The present invention provides a casting apparatus and a casting method capable of suppressing the occurrence of an internal defect at an end portion of a cast steel.

The present invention provides a casting apparatus and a casting method capable of improving the real rate of cast pieces and reducing manufacturing costs.

A casting apparatus according to an embodiment of the present invention includes: a pressing unit that can be inserted into a mold and is provided to be in contact with at least a portion of an end portion of the cast piece accommodated in the mold; And a driving unit that provides power for lowering the pressing unit.

The pressing unit may include a pressing plate formed to have an area smaller than the inner area of the mold at least.

The pressurizing unit may include an exhaust pipe extending in a vertical direction to discharge gas generated inside the mold and provided to pass through the pressurizing plate.

The pressurizing plate may include an exhaust hole passing through the pressurizing plate to discharge gas generated inside the mold.

The driving unit may include a driving means capable of moving at least in a vertical direction; And a support means for supporting the driving means on the mold.

The drive means is formed in a hollow shape, the drive shaft is movable in the vertical direction; And a fluid supply device for supplying fluid to the inside of the drive shaft.

The drive shaft may include a first shaft formed in a hollow shape in which upper and lower portions are opened and supported by the support member so as to extend in a vertical direction; A second shaft formed in a hollow shape in which an upper part is opened and a lower part is closed so as to communicate with the inside of the first shaft, and at least part of the second shaft is inserted into the inside of the first shaft to be movable along the first shaft; And a cover for sealing an upper portion of the first shaft.

The support means may cover an upper portion of the mold and include a support plate for supporting the driving means; And a fixing member for fixing the support plate to the mold, and the first shaft may be supported by the support plate.

A through hole for inserting the exhaust pipe may be formed in the support plate.

Casting method according to an embodiment of the present invention, the process of injecting molten steel into a mold; Solidifying the molten steel to cast a cast steel, and drawing the cast steel from the mold; Ending the injection of the molten steel; And a process of flattening the distal end of the cast piece inside the mold.

The planarization process may be performed before the molten steel inside the mold is solidified.

The planarizing process may include providing a pressure plate insertable into the mold; And inserting a pressure plate into the mold. And a process of pressing the pressing plate.

The process of pressing the pressing plate may include flowing the unsolidified molten steel at the distal end of the cast steel.

The planarizing process may include discharging the gas generated from the molten steel to the outside of the mold.

After the flattening process, a process of pulling out the pressing plate and the distal end of the cast steel from the mold may be included, and the pressing plate may be fused to the distal end of the cast steel to be pulled out from the mold.

According to the embodiment of the present invention, it is possible to reduce the occurrence of internal defects at the distal ends of the cast steel. That is, it is possible to suppress the occurrence of internal defects such as pipes at the end of the cast by pressing the end of the cast at the end of casting. Therefore, since the length of the end portion of the cast steel cut after casting is reduced, the error rate of the cast steel can be improved, and manufacturing cost can be reduced.

1 is a perspective view schematically showing a casting apparatus according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of a casting apparatus according to an embodiment of the present invention.
3 is a view showing various modified examples of the pressing unit.
4 is a perspective view and a cross-sectional view showing a state in which a casting apparatus according to an embodiment of the present invention is applied to a mold.
5 is a view sequentially showing a casting method according to an embodiment of the present invention.
6 is a view showing a state in which an end portion of a cast piece from which a pipe is removed by a casting method according to an embodiment of the present invention is withdrawn from a mold.

Hereinafter, with reference to the accompanying drawings, a method and an apparatus for manufacturing a cast iron according to an embodiment of the present invention will be described in detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only the present embodiments make the disclosure of the present invention complete, and the scope of the invention to those of ordinary skill in the art It is provided to inform you.

The casting apparatus according to the embodiment of the present invention may remove internal defects such as pipes formed at the end of the cast by being inserted into the mold at the end of casting. That is, when the injection of molten steel into the mold is completed at the end of the casting, the drawing of the cast steel is temporarily stopped, so that the unsolidified molten steel at the distal end of the cast steel is sufficiently solidified. In this case, an internal defect may occur in the distal end portion of the cast piece due to a temperature difference between the outer and the inner portion of the cast piece. Accordingly, in an embodiment of the present invention, the occurrence of internal defects such as pipes at the distal end of the cast can be suppressed or prevented by moving, that is, flattening, to a portion where the molten steel injected into the mold is cooled and solidified and contracted. The flattening of the ends of the cast steel can be performed before the molten steel is completely solidified. The casting apparatus according to an embodiment of the present invention can be applied to various casting methods such as a continuous casting method and a vertical semi-continuous casting method.

1 is a perspective view schematically showing a casting apparatus according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of a casting apparatus according to an embodiment of the present invention, FIG. 3 is a view showing various modified examples of a pressing unit, and FIG. 4 Is a perspective view and a cross-sectional view showing a state in which a casting apparatus according to an embodiment of the present invention is applied to a mold.

1 and 2, the casting apparatus according to an embodiment of the present invention is provided to be insertable into the mold 10 and to be in contact with at least a portion of the distal end of the cast piece provided in the mold 10 It may include a pressing unit 100 and a driving unit 200 provided on the upper portion of the pressing unit 100 so as to be in contact with at least a portion of the pressing unit to move the pressing unit 100 in the vertical direction.

The pressing unit 100 may include a pressing plate 110 having at least the same or similar shape as the cross-sectional shape of the cast steel or the cross-sectional shape of the mold 10 in the transverse direction. For example, when the cross-sectional shape of the cast or mold 10 is circular, the pressing plate 110 may be formed in a circular shape, and when the cross-sectional shape of the cast or mold 10 is square, the pressing plate 110 ) May be formed in a square shape. This is to flatten the distal end of the cast by bringing the pressing plate 110 into contact with the distal end of the cast.

The pressing plate 110 is inserted into the mold 10 and is formed to be smaller than the cross-sectional area in the transverse direction of the mold 10 so that it can move in the longitudinal direction of the mold 10, for example, in the lower direction or in the direction in which the cast piece is drawn. Can be. Since the pressure plate 110 is in direct contact with the hot molten steel, it may be formed to have a sufficient thickness so as not to melt while flattening the distal end of the cast steel. In addition, the pressure plate 110 may be formed of the same or similar material as the cast steel. This is because the pressing plate 110 is fused to the distal end of the cast and is pulled out from the mold 10. Even if the distal end of the cast is flattened, the distal end of the cast may be cut to some extent. At this time, since the pressing plate 110 is also cut when cutting the end portion of the cast piece, it is preferable to form the same or similar material as the end portion of the cast piece or the cast piece so that it can be used as a scrap together with the cut end portion of the cast piece.

The pressurization unit 100 may include an exhaust pipe 120 for discharging gas generated from molten steel. The exhaust pipe 120 passes through the pressure plate 110 and may be connected to the pressure plate 110 so as to extend in the vertical direction. In this case, the exhaust pipe 120 may be formed at a position corresponding to the center of the end portion of the cast iron in which the unsolidified molten steel at the end of casting is present in the pressure plate 110. The exhaust pipe 120 may be formed to have a length that can be exposed to the outside of the mold 10 at least when the pressing plate 110 is lowered to flatten the distal end of the cast iron. This is to smoothly discharge the gas generated from the molten steel to the outside of the mold 10.

In this way, the gas generated from the molten steel can be discharged to the outside of the mold 10 by connecting the exhaust pipe 120 to the pressurizing plate 110, but as shown in FIG. 3, the shape of the pressurizing part is variously modified to occur in the molten steel. It is also possible to discharge the gas to the outside of the mold (10).

Referring to (a) of FIG. 3, the pressurization unit 100 may include a pressurization plate 110 in which an exhaust hole 112 is formed. In this case, the exhaust hole 112 may be formed in a plurality in a position corresponding to the center of the end portion of the cast iron in the end of the casting unsolidified molten steel is present in the pressure plate 110. If the exhaust hole 112 is formed in the pressure plate 110 as described above, it is possible to prevent the risk that the mold flux or slag existing above the unsolidified molten steel may leak out of the mold 10 in the process of flattening the end of the cast steel. I can.

Referring to (b) of FIG. 3, the pressurizing unit 100 may include a pressurizing plate 110 having an exhaust hole 112 formed therein, and an exhaust pipe 120 extending in the vertical direction while penetrating the pressurizing plate 110. have. In this case, the exhaust hole 112 may be formed outside the exhaust pipe 120, and a plurality of the exhaust holes 112 may be formed to be spaced apart. In this case, even if any one of the exhaust hole 112 and the exhaust pipe 120 is blocked by the unsolidified molten steel in the process of flattening the end portion of the cast steel, gas generated from the molten steel can be smoothly discharged. For example, when the exhaust pipe 120 is blocked by unsolidified molten steel, gas may be discharged through the exhaust hole 112. Alternatively, when some of the exhaust holes 112 are blocked, gas may be discharged to the remaining exhaust holes 112 and the exhaust pipe 120.

The driving unit 200 may include driving means 210 and 220 for moving the pressure plate 110, and a supporting means 230 for supporting the driving means 210 and 220 on the mold 10.

The driving means 210 and 220 may include a drive shaft 210 provided to extend in the vertical direction, and a fluid supply 220 providing power to move the drive shaft 210 in the vertical direction.

The drive shaft 210 is formed in a hollow shape in which the upper and lower portions are opened, and the first shaft 212 extending in the vertical direction and the hollow upper part is opened and the lower part is closed so as to communicate with the inside of the first shaft 212 A second shaft 214 formed in a shape and at least partially inserted into the inside of the first shaft 212 and a cover 216 for sealing an upper portion of the first shaft 212 may be included.

Referring to FIG. 4B, the first shaft 212 may be formed such that the upper part 212a is bent outward and the lower part 212b is bent inward. At this time, the upper portion 212a of the first shaft is a portion supported by the support plate 232 when inserted into the insertion hole 235 formed in the support plate 232 of the support means 230 to be described later. In addition, the lower portion 212b of the first shaft is a portion for preventing the second shaft 214 from being separated when the second shaft 214 is inserted into the first shaft 212.

In addition, the second shaft 214 may be formed to have a diameter smaller than the diameter of the second shaft 214 so as to be inserted into the first shaft 212 through the upper side of the first shaft 212. At this time, in order to prevent the second shaft 214 from separating from the inside of the first shaft 212, the upper part 214a of the second shaft is externally bent so as to be in contact with the lower part 212b of the first shaft. It can be formed by bending. In this case, the upper portion (214a) of the second shaft can be inserted into the interior of the first shaft (212), so that it can move in the longitudinal direction of the first shaft (212) while in contact with the inner peripheral surface of the first shaft (212). It may be formed to have a diameter similar to the inner diameter of the first shaft 212. This requires increasing the pressure by injecting a fluid such as an inert gas into the inside of the first shaft 212 and the second shaft 214 in order to move the second shaft 214 in the vertical direction. However, if the fluid leaks to the contact portion between the first shaft 212 and the second shaft 214, it is difficult to smoothly increase the internal pressure of the first shaft 212 and the second shaft 214, and thus, the second shaft This is because it becomes difficult to move (214).

The cover 216 may be connected to the upper portion 212a of the first shaft so as to seal the inside of the first shaft 212 and the second shaft 214. In this case, the cover 216 may be connected to the upper portion 212a of the first shaft bent outward through a first fixing member 218 such as a bolt. In addition, an injection hole 217 for connecting to the fluid supply 220 may be formed in the cover 216. An airtight member (not shown) such as an O-ring may be disposed at the connection portion between the cover 216 and the first shaft 212 in order to suppress or prevent leakage of fluid.

At least one drive shaft 210 having such a configuration may be provided.

The fluid supply 220 is a supply pipe 224 and a drive shaft 210 interconnecting the reservoir 222 providing a space for storing the fluid and the inlet 217 formed in the cover 216 of the drive shaft 210. It may include a valve 226 provided in the supply pipe 224 to adjust the amount of fluid supplied to ). The drive shaft 210 may be operated using various fluids such as oil and gas. Since oil is not suitable for use in very hot working environments, it is recommended to use gas as the fluid. In the case of using gas as a fluid, since molten steel may be oxidized when gas leaks between the first shaft 212 and the second shaft 214, it is preferable to use an inert gas such as argon. When two drive shafts 210 are provided, the supply pipe 224 may independently connect the reservoir 222 and the two drive shafts 210, and as shown in FIG. 1, the reservoir 222 and the two The drive shaft 210 may be connected to each other. In the former case, valves 226 are installed in each supply pipe 224 to independently control the amount of fluid supplied to each of the drive shafts 210.

The support means 230 may include a support plate 232 capable of covering the upper portion of the mold 10 and a second fixing member 234 for fixing the support plate 232 to the mold 10. .

Referring to FIG. 4A, the support plate 232 may be seated on the mold 10 and formed to have an area capable of covering the mold 10. In this case, the support plate 232 may be formed to have a larger area than the pressure plate 110. The support plate 232 includes a through hole 233 for discharging the gas discharged from the molten steel to the outside of the mold 10, and an insertion hole 235 through which the first shaft 212 of the driving means 210 and 220 can be inserted. ) Can be formed.

The through hole 233 may be formed in the center of the support plate 232. In this case, the central portion of the support plate 232 may correspond to the central portion of the distal end of the cast iron in which the unsolidified molten steel is present at the end of casting, and may be a region corresponding to a position where the exhaust pipe 120 is formed. When the pressing part 100 is formed including the exhaust pipe 120, the exhaust pipe 120 may be inserted into the through hole 233. In this case, when the pressure plate 110 is lowered to flatten the end of the cast steel, the exhaust pipe 120 is kept inserted into the through hole 233, so that the pressure plate 110 is prevented from being biased to either side. I can. On the other hand, when the pressurization part 100 does not include the exhaust pipe 120, that is, when it includes only the pressurization plate 110 in which the exhaust hole 112 is formed as shown in (a) of FIG. 3, the exhaust hole 112 Gas discharged to) may be discharged to the outside of the mold 10 through the through hole 233.

Insertion holes 235 may be formed one by one on both sides of the through hole 233. This is to lower the pressure plate 110 in a state in which the pressure plate 110 is horizontally maintained in order to flatten the end portion of the cast piece. Accordingly, the drive shaft 210 may be inserted into each of the insertion holes 235 to be fixed. At this time, the drive shaft 210 inserts the first shaft 212 into the insertion hole 235 to seat on the support plate 232, and then inserts the second shaft 214 into the first shaft 212, and After arranging the cover 216 on the upper part of the first shaft 212, the cover 216, the upper part of the first shaft 212 and the support plate 232 are passed through the first fixing member 218 to pass the support plate ( 232) can be fixed. Here, the first shaft 212 is described as being formed as a structure independent from the support plate 232, but the first shaft 212 may be integrally formed with the support plate 232. In this case, the first shaft 212 may be formed to extend below the insertion hole 235 formed in the support plate 232.

The second fixing member 234 may be used to fix the support plate 232 to the mold 10. If the support plate 232 is not fixed to the mold 10 and the drive shaft 210, that is, the second shaft 214 is lowered, contact with the pressure plate 110 is possible, but the pressure plate 110 is moved downward. There is a difficult problem. Therefore, in order to flatten the distal end of the cast steel, the support plate 232 to which the drive shaft 210 is fixed is mounted on the mold 10, and then the support plate 232 is placed in the mold 10 using the second fixing member 234. Need to be fixed or bonded to. And after the flattening of the end portion of the cast steel is completed, the second fixing member 234 is separated from the support plate 232 and the mold 10 for the next process, and the support plate 232 and the drive shaft 210 are formed into the mold 10 ) Can be separated or dismantled.

Hereinafter, a casting method according to an embodiment of the present invention will be described.

FIG. 5 is a view sequentially showing a casting method according to an embodiment of the present invention, and FIG. 6 is a view showing a state in which an end portion of a cast piece from which a pipe is removed by a casting method according to an embodiment of the present invention is withdrawn from a mold.

Casting method according to an embodiment of the present invention, the process of injecting molten steel into the mold 10, the process of casting the cast steel by solidifying the molten steel, the process of drawing the cast steel from the mold 10, and ending the injection of the molten steel. It may include a process and a process of flattening the distal end of the cast piece inside the mold.

First, the molten steel, which has been refined, may be injected into the mold 10. The molten steel injected into the mold 10 may be cast into a cast iron while forming a solidification cell while being cooled by the cooling ability of the mold 10. The cast piece is drawn to the lower portion of the mold 10 and may be cooled and reduced by cooling water while passing through a cooling table provided under the mold 10.

On the other hand, when the injection of molten steel into the mold 10 is finished, the molten steel injected into the mold 10, that is, the unsolidified molten steel at the end of the cast steel may be temporarily stopped so that the molten steel can be sufficiently solidified.

When the drawing of the cast steel is stopped, an immersion nozzle (not shown) for injecting molten steel into the mold 10 may be removed from the upper part of the mold 10 and the distal end of the cast steel may be flattened. At this time, it is preferable to perform the process of flattening the end portion of the cast steel before the molten steel inside the mold 10 is completely solidified.

In order to flatten the distal end of the cast piece, the pressing plate 110 may be inserted into the mold 10 (see FIG. 5A). In this case, the pressure plate 110 may be inserted into the mold 10 so that the exhaust pipe 120 is exposed above the mold 10. When the injection of molten steel is completed and the drawing of the cast steel is stopped, the top of the distal end of the cast is cooled from the surface and a pipe begins to form inside the distal end of the cast. In this case, since the molten steel at the end of the cast is completely solidified, when the pressing plate 110 is inserted into the mold 10, the bottom surface of the pressing plate 110 comes into contact with the top of the distal end of the cast steel. Pressure is applied to the top of the distal end of the cast iron by the load, so that the top of the distal end may be flattened to some extent.

Thereafter, the support plate 232 to which the drive shaft 210 is connected is mounted on the mold 10 and the support plate 232 can be fixed to the mold 10 using the second fixing member 234. (See Fig. 5(b)).

Next, by opening the valve 226 of the fluid supply unit 220, a fluid stored in the reservoir 222, for example, argon gas, may be injected into the drive shaft 210 through the supply pipe 224 (Fig. 5). (C) of). In this way, when an inert gas such as argon gas is injected into the drive shaft 210, even if argon gas flows out of the drive shaft 210, it is possible to prevent the unsolidified molten steel at the end of the cast steel from being oxidized. When argon gas is injected into the driving shaft 210, the internal pressure of the driving shaft 210 increases, so that the second shaft 214 constituting the driving shaft 210 moves downward so that the driving shaft 210 extends. When the drive shaft 210 is elongated in this way, the lower portion of the drive shaft 210, for example, the lower portion of the second shaft 214 contacts the upper surface of the pressure plate 110 to press the pressure plate 110. At this time, the two drive shafts 210 are connected to the support plate 232, and argon gas is independently supplied to the two drive shafts 210 so that the two drive shafts 210 can move at the same distance or extend to the same length. It can also be injected.

When the pressing plate 110 is pressed using the drive shaft 210 as described above, the unsolidified molten steel at the end portion of the cast iron flows, so that the end portion of the cast iron may be flattened. That is, when the pressing plate 110 is pressed using the drive shaft 210, the top of the distal end of the cast iron which has been in contact with the bottom of the pressing plate 110 collapses and may be mixed with the unsolidified molten steel existing inside the distal end of the cast steel. have. And as the unsolidified molten steel flows into the space between the distal end of the cast and the pressing plate 110, the distal end of the cast may be flattened.

In the process of flattening the end portion of the cast steel, gas generated from the unsolidified molten steel may be discharged to the outside of the mold 10 through the exhaust pipe 120 or the exhaust hole 112 connected to the pressurization plate 110. In addition, some of the unsolidified molten steel may flow into the exhaust pipe 120 or the exhaust hole 112 after the end portion of the cast iron is flattened. After flattening the distal end of the cast, the pressing plate 110 is fused to the distal end of the cast and can be pulled out from the mold 10 together with the distal end of the cast. In this way, the unsolidified molten steel introduced into the exhaust pipe 120 or the exhaust hole 112 may be solidified to improve the adhesion between the pressing plate 110 and the distal end of the cast iron. Accordingly, it is possible to prevent the pressing plate 110 from being separated from the distal end of the cast steel when the distal end of the cast iron moves along the cooling table.

When the end portion of the cast iron is flattened, the valve 226 of the fluid supply unit 220 may be closed to block the supply of argon gas to the drive shaft 210. In addition, the second fixing member 234 may be separated from the support plate 232 and the mold 10, and the support plate 232 and the driving shaft 210 may be removed from the mold 10 (Fig. 5(d)). Reference). At this time, when the supply of argon gas to the drive shaft 210 is cut off, at least a portion of the argon gas injected into the drive shaft 210 is connected to the first shaft 212 and the second shaft 214 or the contact part. Can be discharged to the outside through. That is, the first shaft 212 and the second shaft 214 are connected so as to be in close contact with each other, but the interior thereof cannot be completely sealed. Therefore, since some of the argon gas injected into the drive shaft 210 flows out of the drive shaft 210, the pressure inside the drive shaft 210 is lowered so that the second shaft 214 can move inside the first shaft 212 Can be Accordingly, in the case of flattening the end portion of the cast iron in the next step, argon gas is injected into the drive shaft 210 to be used again to pressurize the pressure plate 110.

In addition, by starting the drawing of the cast piece that has been temporarily stopped, the distal end of the cast piece and the pressing plate 110 may be pulled out from the mold 10 (see FIG. 6 ). Here, it has been described that the drawing of the cast steel is restarted after removing the support plate 232 and the drive shaft 210 from the mold 10, but the support plate 232 and the drive shaft 210 are installed in the mold 10 It is also possible to restart the drawing of the cast iron.

In the above, the present invention has been described with reference to the above-described embodiments and the accompanying drawings, but the present invention is not limited thereto, but is limited by the claims to be described later. Therefore, those of ordinary skill in the art will appreciate that the present invention can be variously modified and modified without departing from the spirit of the claims to be described later.

10: mold 100: pressing part
110: pressure plate 120: exhaust pipe
200: drive unit 210: drive shaft
220: fluid supply 230: support means

Claims (15)

A pressing portion that can be inserted into the mold and is provided to be in contact with at least a portion of the end portion of the cast piece accommodated in the mold; And
A driving unit that provides power for lowering the pressing unit;
Casting device comprising a. The method according to claim 1,
The pressing part,
Casting apparatus comprising a pressing plate formed to have an area smaller than the inner area of the mold at least. The method according to claim 2,
The pressing part,
Casting apparatus comprising an exhaust pipe extending in the vertical direction to discharge the gas generated inside the mold, and provided to pass through the pressure plate. The method according to claim 2 or 3,
The pressure plate is a casting apparatus including an exhaust hole passing through the pressure plate to discharge the gas generated inside the mold. The method of claim 4,
The driving unit,
At least a part of the driving means is movable in the vertical direction; And
Casting apparatus comprising a; support means for supporting the drive means to the mold. The method of claim 5,
The driving means,
A drive shaft formed in a hollow shape and movable in a vertical direction; And
Casting apparatus comprising a; a fluid supply for supplying a fluid to the inside of the drive shaft. The method of claim 6,
The drive shaft,
A first shaft formed in a hollow shape in which upper and lower portions are opened, and supported by the support member so as to extend in a vertical direction;
A second shaft formed in a hollow shape in which an upper part is opened and a lower part is closed so as to communicate with the inside of the first shaft, and at least part of the second shaft is inserted into the inside of the first shaft to be movable along the first shaft; And
Casting apparatus comprising a; a cover for sealing the upper portion of the first shaft. The method of claim 7,
The support means,
A support plate capable of covering an upper portion of the mold and supporting the driving means; And
Including; a fixing member for fixing the support plate to the mold,
The first shaft is a casting device supported by the support plate. The method of claim 8,
Casting apparatus in which a through hole for inserting the exhaust pipe is formed in the support plate. Injecting molten steel into the mold;
Solidifying the molten steel to cast a cast steel, and drawing the cast steel from the mold;
Ending the injection of the molten steel; And
Casting method comprising a; step of flattening the end portion of the cast iron inside the mold. The method of claim 10,
The planarization process,
Casting method performed before the molten steel inside the mold is solidified. The method of claim 11,
The planarization process,
Providing a pressure plate insertable into the mold; And
Inserting a pressure plate into the mold; And
Casting method comprising; the process of pressing the pressure plate. The method of claim 12,
The process of pressing the pressure plate,
Casting method comprising the process of flowing the unsolidified molten steel at the end of the cast steel. The method according to any one of claims 11 to 13,
The planarization process,
Casting method comprising the step of discharging the gas generated in the molten steel to the outside of the mold. The method of claim 14,
After the planarization process,
Including the process of drawing the pressure plate and the distal end of the cast steel from the mold,
Casting method in which the pressure plate is fused to the distal end of the cast and pulled out from the mold.

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