JP2013244500A - Device and method for producing casting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for producing a casting capable of directly cooling an inside of molten metal annularly led from a molten metal surface of a molten metal tank during producing an annular casting, and to provide a method for producing the same.SOLUTION: A device for producing a casting includes a molten metal tank 2 for storing a molten metal M, and a cooling means 3 for cooling and solidifying the molten metal annularly led from a molten metal surface Ma of the molten metal tank 2. The cooling means 3 includes at least an inner cooling pipe 3a supplying a refrigerant to the inside of the molten metal annularly led from the molten metal surface Ma of the molten metal tank 2 through the inside of the molten metal M of the molten metal tank 2 and discharging the refrigerant supplied to the inside of the molten metal from the inside of the molten metal through the inside of the molten metal M of the molten metal tank 2.

Description

  The present invention relates to a casting body manufacturing apparatus and a manufacturing method thereof, and more particularly, to a casting body manufacturing apparatus using a free casting method and a manufacturing method thereof.

  Conventionally, a metal product having a complicated shape has been manufactured by filling a molten metal (a molten metal) into a mold having a cavity having a predetermined shape and solidifying the molten metal in the mold.

  By the way, in the casting method using a mold, the molten metal filled in the cavity is cooled and solidified from the inner wall surface of the cavity of the mold, so that casting defects such as a sinkhole and a bubble nest may occur. Further, since thermal deformation that occurs after the molten metal is solidified in the mold is constrained by the mold, solidification cracks, cold cracks, and the like may occur.

  In recent years, a technique related to a casting method that does not use a mold, called a pulling continuous casting method or a free casting method, has been proposed for such a problem. In any of these casting methods, a molten metal (melted metal) is stored in a molten metal tank, and the molten metal is led out along a predetermined path to solidify the derived molten metal to form a cast body. It is a method to do. That is, when the molten metal is derived from the molten metal surface of the molten metal tank, the shape of the derived molten metal is temporarily maintained by the oxide film and surface tension formed on the surface, and thus the molten metal is derived from the molten metal surface in this way. The molten metal whose shape has been temporarily maintained is solidified by a predetermined cooling means, and the solidified metal is gradually separated from the molten metal surface, and a new molten metal is derived from the molten metal surface, and the molten metal is derived. In this method, a molten metal having a predetermined shape is formed by continuously solidifying the molten metal.

  According to these casting methods, the molten metal led out from the molten metal tank can be continuously cooled and solidified, so that the problem of casting defects such as sinkholes that can occur in the mold can be solved. For example, a high-quality cast can be produced even when an alloy that easily causes solidification cracking, such as a 6000 series aluminum alloy for extension, is used.

  By the way, as the cooling means used in these casting methods, for example, a means for injecting a coolant or the like to the molten metal led out from the molten metal surface to cool it directly, or the molten metal is led out from the molten metal surface of the molten metal tank. Means for cooling indirectly through a metal inducer used for this purpose or a pre-solidified portion of the molten metal are known.

  Among the cooling means described above, Patent Document 1 discloses a technique for forcibly cooling a molten metal by injecting water as a coolant onto the surface of the molten metal derived from the molten metal surface of the molten metal tank.

  In the pulling continuous casting apparatus disclosed in Patent Document 1, a cooling box is installed at an upper position close to the molten metal surface, a water injection nozzle is provided in the cooling box, and water is injected from the water injection nozzle onto the molten metal surface. Then, the molten metal is forcibly cooled to cast a cast body such as a tapered round bar.

JP-A 63-199050

  By the way, when producing a cast body having an annular shape, the molten metal is led out in an annular shape from the molten metal surface of the molten metal bath, and is derived in an annular shape from the molten metal surface of the molten metal bath and the molten metal surface. The heat released from the molten metal or the like is likely to be trapped in the region defined by the inner peripheral surface of the molten metal, and the inner side of the molten metal led out from the molten surface is relatively smaller than the outer side of the molten metal. It is known to be hot.

  According to the pulling continuous casting apparatus disclosed in Patent Document 1, when manufacturing a cast body having a simple shape such as a tapered round bar, water is supplied from the water injection nozzle as a cooling means to the outer peripheral surface of the molten metal. Although the molten metal can be cooled inward from the outer peripheral surface of the molten metal by spraying, when manufacturing a cast body having an annular shape, the inner side of the annular molten metal that can be relatively high temperature is used. There is a problem that the cooling efficiency of the molten metal that cannot be cooled directly and is derived from the molten metal surface of the molten metal tank is low.

  In addition, among the conventional cooling means described above, in the case of cooling the molten metal derived from the molten metal surface by using a means for indirectly cooling through a metal induced body or a solidified part of the molten metal, It is known that the distance between the cooling means and the molten metal bath surface increases as the solidified molten metal moves away from the molten metal surface, and the cooling efficiency of the molten metal decreases as the molten metal is derived. Yes.

  This invention is made | formed in view of the subject mentioned above, and when manufacturing the cast body which exhibits an annular shape, it is possible to directly cool the inside of the molten metal led out from the molten metal surface of the molten metal tank. An object of the present invention is to provide an apparatus for manufacturing a cast body and a method for manufacturing the same.

  In order to achieve the above object, the cast body manufacturing apparatus of the present invention includes a molten metal tank for storing a molten metal, and a cooling means for cooling and solidifying the molten metal led out from the molten metal surface of the molten metal tank. The cooling means supplies the refrigerant to the inside of the molten metal led out in an annular shape from the molten metal surface of the molten metal tank through at least the inside of the molten metal of the molten metal tank. The apparatus includes a cooling pipe that discharges the coolant supplied to the inside of the molten metal from the inside of the annularly led molten metal through the inside of the molten metal in the molten metal tank.

  Here, examples of the material for forming the molten metal applied in the manufacturing apparatus described above include metals such as iron, aluminum, magnesium, and titanium, and alloys thereof. The “molten metal” includes not only a liquid phase state as a whole but also a solid-liquid coexistence state in which a liquid phase and a solid phase are mixed. Further, the “annular” includes a circular shape and an elliptical shape, and a polygonal shape having a hollow space such as a substantially rectangular frame shape.

  Moreover, as a refrigerant | coolant used with the cooling means applied with the manufacturing apparatus mentioned above, liquids, such as gas, such as air and an inert gas, and water, for example can be mentioned.

  According to the manufacturing apparatus described above, in order to cool the molten metal led out from the molten metal surface of the molten metal tank, the coolant is supplied to the inside of the molten metal led out from the molten metal surface of the molten metal tank, By having a cooling pipe that discharges the refrigerant supplied to the inside of the molten metal from the inside of the molten metal, the inside of the molten metal that is led into an annular shape that can be relatively hot is directly cooled using the refrigerant. Since the coolant that has become hot due to heat exchange with the molten metal can be discharged from the inside of the molten metal, the inside of the molten metal that is led out from the molten metal surface in a ring shape is directly and efficiently used. Can be cooled to. Further, the cooling pipe is arranged through the inside of the molten metal in the molten metal tank, so that the molten metal solidified by the cooling means is gradually separated from the molten metal surface, and a new molten molten metal is removed from the molten metal surface. Since the contact between the solidified metal melt and the cooling pipe can be surely avoided when deriving, the configuration of the cooling means can be greatly simplified.

  In the manufacturing apparatus described above, the cooling means supplies the refrigerant to the inside of the molten metal led out from the molten metal surface of the molten metal tank and discharges the refrigerant from the inside of the molten metal led out in the ring. It is preferable to have a shielding part that shields the opening of the cooling pipe disposed inside the molten metal.

  According to the manufacturing apparatus described above, the opening of the cooling pipe disposed inside the molten metal can be arbitrarily shielded by the shielding portion, and the supply of the refrigerant to the inside of the molten metal and the refrigerant from the inside of the molten metal can be performed. Since discharge can be adjusted arbitrarily and the inside of the molten metal can be adjusted to an arbitrary temperature, the cooling rate inside the molten metal can be adjusted arbitrarily.

  In the manufacturing apparatus described above, the cooling pipe includes a supply pipe for supplying a refrigerant to the inside of the molten metal and a discharge pipe for discharging the refrigerant from the inside of the molten metal, and the opening of the cooling pipe is shielded by the shielding portion. In this case, it is preferable that the supply pipe and the discharge pipe are in fluid communication, and the refrigerant that has flowed through the supply pipe flows into the discharge pipe.

  According to the manufacturing apparatus described above, the supply pipe and the discharge pipe are provided independently, and the refrigerant that has flowed through the supply pipe when the opening of the cooling pipe is shielded by the shielding portion flows into the discharge pipe. Even when the coolant pipe is passed through the supply pipe and the opening of the cooling pipe is shielded by the shielding portion, the refrigerant that has flowed through the supply pipe can be passed through the discharge pipe. Can be smoothed. Further, when the opening of the cooling pipe is shielded by the shielding portion, the refrigerant can flow through both the supply pipe and the discharge pipe, and the refrigerant flowing through the cooling pipe is arranged inside the molten metal in the molten metal tank. Since both the supply pipe and the discharge pipe of the cooling pipe used can be cooled, deformation of the cooling pipe due to the heat of the molten metal in the molten metal tank can be suppressed, and the configuration of the cooling pipe can be greatly simplified Can do.

  Further, in the manufacturing apparatus described above, when the opening of the cooling pipe is shielded by the shielding portion, a portion of the cooling pipe arranged inside the molten metal led out from the molten metal surface of the molten metal tank is made of metal. It is preferable to be immersed in the molten metal in the molten metal tank.

  According to the manufacturing apparatus described above, when the opening of the cooling pipe is shielded by the shielding portion, the cooling pipe disposed inside the molten metal led out in an annular shape from the molten metal surface of the molten metal tank is made of the molten metal in the molten metal tank. By dipping into the inside of the cooling pipe, the inside surface of the molten metal led out in an annular shape from the molten metal surface of the molten metal tank can be secured while preventing the molten metal from entering the inside of the cooling pipe. Since the shape of the molten metal derived | led-out from the molten metal surface of a molten metal tank can be changed arbitrarily, the shape freedom degree of the cast body manufactured can be raised.

  Here, the cooling pipe may have a double pipe structure in which a discharge pipe is included inside the supply pipe, or a double pipe structure in which the supply pipe is included inside the discharge pipe. It may be.

  When the cooling pipe has a double pipe structure in which the discharge pipe is included inside the supply pipe, the supply pipe through which the relatively low temperature refrigerant flows is adjacent to the molten metal in the molten metal tank. By disposing, the entire cooling pipe can be effectively cooled by the refrigerant flowing through the supply pipe, so that the configuration of the cooling pipe can be greatly simplified. On the other hand, when the cooling pipe has a double pipe structure in which the supply pipe is included inside the discharge pipe, the supply pipe through which the relatively low-temperature refrigerant flows is the molten metal in the molten metal tank. Since the heat absorption of the molten metal in the molten metal tank by the refrigerant flowing through the supply pipe can be suppressed, the inside of the molten metal can be cooled more efficiently. .

  Further, the method for producing a cast body according to the present invention is a casting body in which a molten metal is led out from the molten metal surface of the molten metal tank, and the cast metal having an annular shape is formed by cooling and solidifying the derived molten metal. The refrigerant is supplied to the inside of the molten metal led out from the molten metal surface of the molten metal tank through the inside of the molten metal of the molten metal tank, and the refrigerant supplied to the inside of the molten metal is This is a method of discharging from the inside of the molten metal led out in an annular shape through the inside of the molten metal in the molten metal tank.

  According to the manufacturing method described above, by supplying the refrigerant to the inside of the molten metal led out from the molten metal surface of the molten metal tank, by discharging the refrigerant supplied to the inside of the molten metal from the inside of the molten metal, The inside of the molten metal that is led out in a ring shape that can be relatively hot can be directly cooled by the refrigerant, and the refrigerant that has become hot due to heat exchange with the molten metal can be discharged from the inside of the molten metal. Therefore, the inside of the molten metal led out in an annular shape from the molten metal surface of the molten metal tank can be directly and efficiently cooled. In addition, the refrigerant is supplied to the inside of the molten metal through the inside of the molten metal in the molten metal tank, and the refrigerant supplied to the inside of the molten metal is discharged by passing through the inside of the molten metal in the molten metal tank. When the molten metal is gradually separated from the molten metal surface and a new molten metal melt is led out from the molten metal surface, the refrigerant is supplied into the molten metal without being obstructed by the solidified molten metal, Since the refrigerant can be discharged from the inside of the molten metal, the inside of the molten metal can be cooled smoothly.

  As can be understood from the above description, according to the casting body manufacturing apparatus and manufacturing method of the present invention, when manufacturing a casting body having an annular shape, it is led out from the molten metal surface of the molten metal tank with a simple configuration. The inside of the molten metal can be directly and efficiently cooled, and the productivity of the cast body can be significantly improved.

It is the perspective view which showed typically the whole structure of embodiment of the manufacturing apparatus of the casting body of this invention. It is the longitudinal cross-sectional view explaining the manufacturing method of the casting using the manufacturing apparatus shown in FIG. 1, Comprising: (a) is the figure explaining the state before deriving a molten metal from a molten metal tank, (b) FIG. 3 is a partially enlarged view showing a part of the inner cooling pipe shown in FIG. It is the longitudinal cross-sectional view explaining the manufacturing method of the cast body using the manufacturing apparatus shown in FIG. 1, Comprising: It is the figure explaining the state immediately after deriving a molten metal from a molten metal tank following the process shown in FIG. . It is the longitudinal cross-sectional view explaining the manufacturing method of the cast body using the manufacturing apparatus shown in FIG. 1, Comprising: (a) solidifies some molten metal derived | led-out from the molten metal tank following the process shown in FIG. It is the figure explaining the state made to do, (b) is the elements on larger scale which expanded and showed a part of inner cooling pipe shown in Fig.4 (a). It is the longitudinal cross-sectional view explaining the manufacturing method of the cast body using the manufacturing apparatus shown in FIG. 1, Comprising: The state which forms the obstruction board with the molten metal derived | led-out from the molten metal tank following the process shown in FIG. FIG. It is a figure which shows one Embodiment of the cast body manufactured with the manufacturing apparatus shown in FIG. 1, Comprising: (a) is the perspective view, (b) is the longitudinal cross-sectional view. It is the longitudinal cross-sectional view explaining the manufacturing method of the cast body using the manufacturing apparatus shown in FIG. 1, Comprising: The figure explaining the state which solidified the molten metal derived | led-out from the molten metal tank following the process shown in FIG. It is. It is the figure which showed the other example of the induction body used for the manufacturing apparatus shown in FIG. 1, Comprising: (a) is the longitudinal cross-sectional view, (b) is an AA arrow line view of Fig.8 (a). .

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a casting body manufacturing apparatus and a manufacturing method thereof according to the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view schematically showing an overall configuration of an embodiment of a casting body manufacturing apparatus according to the present invention.

  The illustrated manufacturing apparatus 10 mainly includes a molten metal tank 2 for storing the molten metal M, and a cooling means 3 for cooling and solidifying the molten metal derived from the molten metal surface Ma of the molten metal M of the molten metal tank 2; A substantially annular outer shape defining member 4 which is arranged in a region between the molten metal surface Ma of the molten metal M of the molten metal tank 2 and the solidified region where the molten metal M is solidified by the cooling means 3 and defines the outer shape of the cast body; And a substantially annular inner shape defining member 5 that is disposed inside the outer shape unit 4A and defines the inner shape of the cast body. It should be noted that the outer shape defining member 4 and the inner shape defining member 5 are moved in arbitrary directions by a moving means (not shown) when the molten metal M is led out from the molten metal surface Ma of the molten metal M in the molten metal tank 2. It has become.

  The cooling means 3 is an inner cooling pipe that cools the molten metal by injecting a refrigerant (for example, water or air) from the inner side among the molten metal derived from the molten metal surface Ma of the molten metal M of the molten metal tank 2. 3a, and an outer cooling pipe 3b that cools the molten metal by injecting a refrigerant from the outer side among the molten metal derived from the molten metal surface Ma of the molten metal M of the molten metal tank 2; Each of the cooling pipe 3a and the outer cooling pipe 3b is in fluid communication with a refrigerant supply unit 3c for supplying a refrigerant.

  Further, the inner cooling pipe 3a is heated to a high temperature by heat exchange between the supply pipe 3aa and the molten metal mainly injected and supplied to the molten metal derived from the molten metal surface Ma of the molten metal M of the molten metal tank 2. It has a double pipe structure in which the discharge pipe 3ab is disposed inside the supply pipe 3aa and both axial centers are arranged concentrically, and is discharged from the supply pipe 3aa. Each of the tubes 3ab is in fluid communication with the refrigerant supply unit 3c. Refrigerant is supplied from the supply pipe 3aa to the molten metal derived from the molten metal surface Ma of the molten metal M of the molten metal tank 2 at the distal end 3d of the inner cooling pipe 3a, that is, the distal ends of the supply pipe 3aa and the discharge pipe 3ab. There are provided a supply port (opening) 3ac for discharging and a discharge port (opening) 3ad for discharging the refrigerant having a high temperature from the periphery of the molten metal to the discharge pipe 3ab. The refrigerant supplied from the refrigerant supply unit 3c to the supply pipe 3aa flows through the supply pipe 3aa, more specifically, between the inner peripheral surface of the supply pipe 3aa and the outer peripheral surface of the discharge pipe 3ab. The refrigerant which is supplied to the molten metal derived from the molten metal surface Ma of the molten metal M in the molten metal tank 2 through the supply port 3ac and becomes a high temperature by heat exchange with the molten metal is discharged through the discharge port 3ad. It is discharged to 3ab, flows through the discharge pipe 3ab, and is discharged to the refrigerant supply unit 3c. And it cools by the conventionally known method in the refrigerant | coolant supply part 3c, and is again supplied to the inner side cooling pipe 3a and the outer side cooling pipe 3b.

  Further, the inner cooling pipe 3a is connected to a moving means 6 for moving the inner cooling pipe 3a in the vertical direction (direction of molten metal) (in the direction of arrow Z in the figure) via the refrigerant supply part 3c. By moving the inner cooling pipe 3a vertically downward together with the refrigerant supply part 3c using the moving means 6, the tip 3d of the inner cooling pipe 3a is immersed in the molten metal M in the molten metal tank 2. It is like that. As the moving means 6, for example, a motor-driven ball screw or the like can be applied.

  Next, referring to FIGS. 2 to 7, an embodiment of a method for producing a cast body using the production apparatus shown in FIG. 1 will be outlined. The method for producing a cast body according to the present embodiment mainly includes a derivation process for deriving the molten metal from the molten metal tank, and a molding process for forming the cast body by solidifying the molten metal derived from the molten metal tank. In the case of continuous casting, the derivation process and the molding process are performed as a series of processes.

  First, FIG. 2 is a longitudinal sectional view illustrating a method for manufacturing a cast body using the manufacturing apparatus shown in FIG. 1, and FIG. 2 (a) illustrates a state before the molten metal is led out from the molten metal tank. FIG. 2B is a partially enlarged view showing a part of the inner cooling pipe shown in FIG.

  When the molten metal M is derived from the molten metal surface Ma of the molten metal tank 2, as shown in FIG. 2A, an induction body 1 (also referred to as a starter) having a substantially disk shape is prepared. Is brought into contact with the molten metal M stored in the molten metal tank 2. Specifically, the lower surface 1A of the induction body 1 is brought into contact with the molten metal surface Ma of the molten metal M stored in the molten metal tank 2, and the soft molten metal M is attached to the lower surface 1A of the induction body 1. Here, the inducer 1 has an outer diameter slightly smaller than the inner diameter of the substantially annular outer shape defining member 4 and larger than the outer diameter of the substantially annular inner shape defining member 5. The outer shape defining member 4 and the inner shape defining member 5 are arranged substantially concentrically in plan view. As a result, the inner shape defining member 5 is disposed at a predetermined distance (for example, corresponding to the thickness of the cast body to be manufactured) from the outer edge of the induction body 1 and is used to define the inner shape of the cast body. It is arranged inside the molten metal M of the molten metal tank 2.

  The inner cooling pipe 3a has a tip 3d disposed inside the molten metal M in the molten metal tank 2 vertically below the induction body 1, and a supply port of the supply pipe 3aa disposed at the tip 3d. 3ac and the discharge port 3ad of the discharge pipe 3ab are immersed in the molten metal M of the molten metal tank 2. Here, the supply port 3ac of the supply pipe 3aa and the discharge port 3ad of the discharge pipe 3ab are shielded by the shielding portion 7 in order to prevent the molten metal M of the molten metal tank 2 from entering the inside cooling pipe 3a. Yes.

  Specifically, as shown in FIG. 2B, the tip of the supply pipe 3aa is open vertically upward, and the end surface 3aA is chamfered so as to widen vertically upward. The distal end of the discharge pipe 3ab is sealed with a top plate 3ae made of a substantially circular plate having an outer diameter relatively smaller than the outer diameter of the discharge pipe 3ab, and the general portion of the discharge pipe 3ab and the top plate 3ae. Are connected by a truncated cone-shaped connecting pipe 3af that becomes narrower in the vertical direction. The connection pipe 3af of the discharge pipe 3ab is formed with a through-hole 3ag for allowing the refrigerant to flow into the discharge pipe 3ab.

  Further, the shielding portion 7 disposed at the front end portion 3d of the inner cooling pipe 3a includes a shielding plate 7a made of a substantially circular plate and a cylindrical body 7b extending vertically downward from the shielding plate 7. The inner diameter of the cylindrical body 7b is set to be substantially equal to the outer diameter of the discharge pipe 3ab, and the discharge pipe 3ab is fitted to the cylindrical body 7b. Further, the outer diameter of the shielding plate 7a is set to be substantially equal to the outer diameter of the supply pipe 3aa, and its side surface 7aA is chamfered so as to widen vertically upward, and the side surface 7aA of the shielding plate 7a and the supply pipe 3aa The end face 3aA is face-matched. Further, the thickness of the shielding plate 7a in the vertical direction is set to be substantially equal to the height in the vertical direction of the connection tube 3af of the discharge pipe 3ab, and a portion of the shielding plate 7a corresponding to the discharge pipe 3ab (its substantially central portion) is penetrated. A mouth 7ag is formed. The through-hole 7ag has a truncated cone shape that becomes narrower in the vertical direction, and the inner shape of the through-hole 7ag has a shape complementary to the outer shape of the connection pipe 3af of the discharge pipe 3ab. The inner peripheral surface 7aB of the through-hole 7ag and the outer peripheral surface 3aB of the connection pipe 3af are flush with each other. Since the vertical thickness of the shielding plate 7a is set to be substantially equal to the vertical height of the connection pipe 3af of the discharge pipe 3ab, the inner peripheral surface 7aB of the through hole 7ag and the outer peripheral surface 3aB of the connection pipe 3af are surfaces. When being combined, the upper surface (top surface) 3aC of the top plate 3ae of the discharge pipe 3ab and the upper surface (top surface) 7aC of the shielding plate 7a of the shielding part 7 are configured to be flush with each other.

  As described above, the discharge pipe 3ab is fitted to the cylindrical body 7b, and the shielding part 7 provided at the tip 3d of the inner cooling pipe 3a is arranged to slide inside the cylindrical body 7b with the discharge pipe 3ab. The cooling pipe 3a is moved relative to the supply pipe 3aa and the discharge pipe 3ab in the vertical direction (see FIG. 4). For example, when the shielding plate 7a of the shielding part 7 is arranged vertically above the tip of the supply pipe 3aa or the discharge pipe 3ab, the side face 7aA of the shielding board 7a and the end face 3aA of the supply pipe 3aa are arranged apart from each other. In addition, the inner peripheral surface 7aB of the through-hole 7ag and the outer peripheral surface 3aB of the connection pipe 3af are spaced apart from each other, and the coolant is supplied to the molten metal through the gap between the side surface 7aA of the shielding plate 7a and the end surface 3aA of the supply pipe 3aa. The supply port 3ac is constructed, and the exhaust for discharging the high-temperature refrigerant to the discharge pipe 3ab by the gap between the inner peripheral surface 7aB of the through-hole 7ag and the outer peripheral surface 3aB of the connection pipe 3af and the through-hole 3ag of the connection pipe 3af. The exit 3ad is configured.

  On the other hand, as shown in FIG. 2 (b), when the shielding plate 7a of the shielding portion 7 is disposed at substantially the same height as the distal end portions of the supply tube 3aa and the discharge tube 3ab, the side surface 7aA of the shielding plate 7a. The end surface 3aA of the supply pipe 3aa and the inner peripheral surface 7aB of the through-hole 7ag and the outer peripheral surface 3aB of the connection pipe 3af are aligned, and the inner cooling pipe 3a of the supply port 3ac and the discharge port 3ad The opening is shielded by the shielding plate 7a, and the intrusion of the molten metal M into the inner cooling pipe 3a is suppressed.

  Here, in order to suppress the thermal deformation of the inner cooling pipe 3a due to the heat of the molten metal M in the molten metal tank 2, even when the supply port 3ac and the discharge port 3ad are shielded by the shielding portion 7, Is supplied with refrigerant. Specifically, the cylindrical body 7b of the shielding part 7 is vertically downward by a predetermined distance from the shielding plate 7a (a distance larger than the relative movement distance of the shielding part 7 with respect to the supply pipe 3aa and the discharge pipe 3ab in the vertical direction). 6 communication ports 7bh are formed at equal positions in the circumferential direction of the cylindrical body 7b. Further, among the general part of the discharge pipe 3ab, the position vertically below the predetermined distance from the connection pipe 3af, that is, the shielding plate 7a of the shielding part 7 is arranged at substantially the same height as the tip of the supply pipe 3aa and the discharge pipe 3ab. In this case, six communication ports 3ah are formed at equal intervals in the circumferential direction of the discharge pipe 3ab at positions corresponding to the communication ports 7bh of the cylindrical body 7b of the shielding part 7. As a result, as shown in the figure, the shielding plate 7a of the shielding part 7 is disposed at substantially the same height as the distal ends of the supply pipe 3aa and the discharge pipe 3ab, and the supply port 3ac and the discharge port 3ad are shielded by the shielding part 7. At this time, the supply pipe 3aa and the discharge pipe 3ab are in fluid communication via the communication port 7bh of the cylindrical body 7b of the shielding part 7 and the communication port 3ah of the discharge pipe 3ab, and the refrigerant supplied from the refrigerant supply part 3c to the supply pipe 3aa. Flows through the supply pipe 3aa, flows through the communication port 7bh of the cylindrical body 7b and the communication port 3ah of the discharge pipe 3ab to the discharge pipe 3ab, and flows through the discharge pipe 3ab to supply the refrigerant. It is discharged to 3c.

  Next, FIG. 3 is a longitudinal sectional view for explaining a method for producing a cast body using the production apparatus shown in FIG. 1, and a state immediately after the molten metal is led out from the molten metal tank following the step shown in FIG. FIG.

  As shown in the drawing, the induction body 1 brought into contact with the molten metal M stored in the molten metal tank 2 is separated from the molten metal surface Ma of the molten metal M in the molten metal tank 2, thereby allowing the molten metal surface Ma of the molten metal tank 2 to move. The molten metal M is derived from the above. At that time, the inner shape defining member 5 disposed inside the molten metal M of the molten metal tank 2 is moved vertically upward in synchronization with the movement of the induction body 1 using a moving means (not shown), and the outer shape defining member 4 and Move to approximately the same height. Thereby, the inner shape of the molten metal M derived from the molten metal surface Ma of the molten metal tank 2 following the movement of the induction body 1 is defined by the inner shape defining member 5. Further, the outer shape of the molten metal M follows the movement of the induction body 1 when the molten metal M derived from the molten metal surface Ma of the molten metal tank 2 passes inside the outer shape defining member 4. It is prescribed by. That is, the thickness of the molten metal M led out from the molten metal surface Ma is regulated by the molten metal M being led out through the region defined by the outer shape defining member 4a and the inner shape defining member 5a.

  Here, when the atmosphere around the molten metal M derived from the molten metal surface Ma of the molten metal tank 2 is an air atmosphere or an oxidizing atmosphere, an oxide film is formed on the surface of the derived molten metal M, and the metal When the atmosphere around the molten metal M is a nitrogen atmosphere, a nitride film is formed on the surface of the derived molten metal M. Further, even in an atmosphere other than the air atmosphere, the oxidizing atmosphere, and the nitrogen atmosphere and in which the surface film is not formed, surface tension acts on the surface of the derived molten metal M. In this way, the surface of the molten metal M derived from the molten metal surface Ma of the molten metal tank 2 is temporarily held in shape by an oxide film, a nitride film, surface tension, etc., and the shape is maintained in a softened state. A (semi-solidified state) molten metal (hereinafter referred to as “holding molten metal”) Mb is formed between the molten metal surface Ma of the molten metal tank 2 and the induction body 1. The retained molten metal Mb gradually moves away from the molten metal surface Ma of the molten metal tank 2 following the movement of the induction body 1, and follows the retained molten metal Mb in the semi-solid state from the molten metal surface Ma of the molten metal tank 2. By deriving the molten metal M, the molten metal M is continuously derived from the molten metal surface Ma of the molten metal tank 2.

  The inner cooling pipe 3a is moved vertically upward using the moving means 6 in synchronization with the movement of the induction body 1 and the inner shape defining member 5 described above. Here, although the tip portion 3d is arranged inside the molten metal M of the molten metal tank 2, the upper surface 3aC of the top plate 3ae of the discharge pipe 3ab and the upper surface 7aC of the shielding plate 7a of the shielding portion 7 are flush with each other. The side face 7aA of the shielding plate 7a and the end face 3aA of the supply pipe 3aa are flush with each other, and the flow resistance of the inner cooling pipe 3a is extremely small. Therefore, the inner cooling pipe 3a is made of metal in the molten metal tank 2. It is smoothly moved inside the molten metal M.

  Next, FIG. 4 is a longitudinal sectional view for explaining a method of manufacturing a cast body using the manufacturing apparatus shown in FIG. 1, and FIG. 4 (a) is derived from the molten metal tank following the step shown in FIG. FIG. 4B is a partially enlarged view showing a part of the inner cooling pipe shown in FIG. 4A enlarged. FIG. .

  As described above, when the induction body 1, the inner shape defining member 5, and the inner cooling pipe 3 a are moved vertically upward (the direction in which the molten metal is led out), the induction body 1 is arranged vertically higher than the outer cooling pipe 3 b. (For example, about several tens of mm above the molten metal surface Ma), a coolant is injected from the cooling means 3 to the retained molten metal Mb which is led out from the molten metal bath 2 and is semi-solidified, and the retained molten metal Mb is cooled and solidified to be solidified. The molten metal Mc in a state is formed. Specifically, it is derived from the molten metal surface Ma of the molten metal bath 2 following the movement of the induction body 1 having a substantially disc shape, and has a substantially annular outer shape defining member 4 and a substantially annular inner shape defining member 5. The outer shape and the inner shape are formed by passing through the region defined by the above, and the refrigerant is injected from the outer cooling pipe 3b to the outer peripheral surface of the semi-solid held molten metal Mb led out in a substantially annular shape, On the inner peripheral surface, refrigerant is injected from the inner cooling pipe 3a disposed vertically above the molten metal surface Ma of the molten metal M in the molten metal tank 2, and is held from both the outer peripheral surface and the inner peripheral surface of the retained molten metal Mb. The molten metal Mb is cooled and solidified.

  More specifically, after the inner cooling pipe 3a is moved vertically upward using the moving means 6 along with the movement of the induction body 1, and the tip 3d is protruded from the molten metal surface Ma of the molten metal tank 2 by a predetermined distance. As shown in FIG. 4B, while the cylindrical body 7b of the shielding part 7 disposed at the tip 3d of the inner cooling pipe 3a is slid with the discharge pipe 3ab of the inner cooling pipe 3a, the shielding part 7 Is moved vertically upward with respect to the supply pipe 3aa and the discharge pipe 3ab of the inner cooling pipe 3a, and the shielding plate 7a of the shielding part 7 is arranged vertically above the tip of the supply pipe 3aa and the discharge pipe 3ab. Thereby, the side surface 7aA of the shielding plate 7a and the end surface 3aA of the supply pipe 3aa are arranged apart from each other, the inner circumferential surface 7aB of the through-hole 7ag and the outer circumferential surface 3aB of the connection pipe 3af are arranged apart from each other, and the shielding plate 7a A supply port 3ac for supplying a coolant to the molten metal is formed by a gap between the side surface 7aA and the end surface 3aA of the supply pipe 3aa, and a gap between the inner peripheral surface 7aB of the through-hole 7ag and the outer peripheral surface 3aB of the connection pipe 3af and the connection pipe 3af. A discharge port 3ad is formed for discharging the refrigerant having a high temperature from the inside of the molten metal to the discharge pipe 3ab by the through-hole 3ag. In addition, the communication port 7bh of the cylindrical body 7b of the shielding part 7 and the discharge pipe 3ab communicated when the shielding plate 7a of the shielding part 7 is disposed at substantially the same height as the distal ends of the supply pipe 3aa and the discharge pipe 3ab. When the shielding plate 7a of the shielding part 7 is disposed vertically above the distal ends of the supply pipe 3aa and the discharge pipe 3ab, the communication port 3ah (see FIG. 2) is connected to the wall surface of the general part of the discharge pipe 3ab. It is shielded by the wall surface of the cylindrical body 7b.

  As described above, even when the supply port 3ac and the discharge port 3ad are shielded by the shielding part 7, the coolant is supplied to the inside of the inner cooling pipe 3a in advance, so that the shielding part 7 supplies the inner cooling pipe 3a. When the supply port 3ac and the discharge port 3ad are formed vertically moving with respect to the pipe 3aa and the discharge pipe 3ab, the refrigerant that is supplied from the refrigerant supply unit 3c to the supply pipe 3aa and flows through the inside of the supply pipe 3aa Is led out from the hot water surface Ma of the molten metal M of the molten metal tank 2 through the supply port 3ac of the supply tube 3aa formed by the gap between the side surface 7aA of the shielding plate 7a and the end surface 3aA of the supply tube 3aa. It is injected into the inside of the holding molten metal Mb. And the refrigerant | coolant which became high temperature by heat exchange with the molten metal Mb of the holding molten metal Mb or the molten metal tank 2 penetrates the clearance gap between the inner peripheral surface 7aB of the through-hole 7ag and the outer peripheral surface 3aB of the connecting pipe 3af, and the connecting pipe 3af. It is discharged to the discharge pipe 3ab through the discharge port 3ad formed by the port 3ag, flows through the discharge pipe 3ab, and is discharged to the refrigerant supply unit 3c.

  As shown in the figure, the supply port 3ac of the supply pipe 3aa is formed on the outer side relative to the discharge port 3ad, more specifically, on the outermost periphery of the inner cooling pipe 3a. The semi-solid retained molten metal Mb that is led out from the molten metal tank 2 can be disposed in the vicinity, and the cooling efficiency of the retained molten metal Mb by the inner cooling pipe 3a can be increased. Further, by chamfering the side surface 7aA of the shielding plate 7a constituting the supply port 3ac and the end surface 3aA of the supply tube 3aa, and injecting the refrigerant obliquely upward with respect to the vertical direction from the supply port 3ac of the supply tube 3aa, For example, compared with the case where the refrigerant is injected in the horizontal direction from the supply port 3ac of the supply pipe 3aa, it becomes easier to flow the refrigerant to the discharge port 3ad formed on the upper surface of the tip 3d of the inner cooling pipe 3a. The flow of the refrigerant inside the derived retained molten metal Mb can be smoothed. Further, when water or the like is used as the refrigerant, the pressure of the water injected from the supply port 3ac is used by injecting the refrigerant obliquely upward from the supply port 3ac of the supply pipe 3aa with respect to the vertical direction. Thus, there is an advantage that dripping of water into the molten metal tank 2 can be suppressed. Further, the refrigerant is injected from a relatively low position with respect to the retained molten metal Mb led out from the molten metal tank 2 by injecting the refrigerant obliquely upward from the supply port 3ac of the supply pipe 3aa with respect to the vertical direction. Therefore, the amount of movement of the inner cooling pipe 3a by the moving means 6 can be suppressed, the configuration of the entire apparatus can be simplified, and the physique of the entire apparatus can be reduced in size.

  In addition, although various methods can be applied as a method of moving the shielding part 7 vertically upward with respect to the supply pipe 3aa and the discharge pipe 3ab of the inner cooling pipe 3a, in the illustrated example, the shielding part 7 is placed at an arbitrary position of the shielding part 7. A permanent magnet is attached in advance, and an electromagnet is attached in advance to an arbitrary portion of the discharge pipe 3ab, and the shield 7 is supplied to the supply pipe 3aa and the discharge pipe 3ab by charging the electromagnet by energization to generate Lorentz force. Is moved vertically upward.

  Next, FIG. 5 is a longitudinal sectional view for explaining a method for producing a cast body using the production apparatus shown in FIG. 1, and is closed with a molten metal derived from a molten metal tank following the step shown in FIG. It is a figure explaining the state which forms a board.

  As shown in the figure, after the induction body 1 is further separated from the molten metal surface Ma of the molten metal M in the molten metal tank 2 and the molten metal of a predetermined length is solidified in the vertical direction, the shielding part 7 is connected to the inner cooling pipe 3a. The supply pipe 3aa and the discharge pipe 3ab are moved vertically downward, and the supply port 3ac of the supply pipe 3aa and the discharge port 3ad of the discharge pipe 3ab are shielded by the shielding part 7. Then, the inner cooling pipe 3 a is moved vertically downward by the moving means 6, and the tip 3 d of the inner cooling pipe 3 a is immersed in the molten metal M in the molten metal tank 2. Further, the inner shape defining member 5 is immersed in the molten metal M in the molten metal tank 2 by a moving means (not shown). Here, the upper surface 5 </ b> A of the inner shape defining member 5, the upper surface 7 a </ i> C of the shielding plate 7 a of the shielding part 7, and the upper surface 3 a </ i> C of the top plate 3 ae of the discharge pipe 3 ab are substantially the same height inside the molten metal M of the molten metal tank 2. Both are immersed in the molten metal M of the molten metal tank 2 as described above. Thus, a predetermined space between the molten metal Ma of the molten metal M of the molten metal tank 2 and the upper surface 5A of the inner shape defining member 5, the upper surface 7aC of the shielding plate 7a of the shielding part 7, and the upper surface 3aC of the top plate 3ae of the discharge pipe 3ab. Therefore, the molten metal M having the predetermined thickness is led out from the molten metal surface Ma of the molten metal tank 2 to follow the movement of the induction body 1, and the outer cooling pipe 3b or the inner The refrigerant is injected from the cooling pipe 3a to be cooled, thereby forming the closing plate Mda (see FIG. 7) made of the solid molten metal Mc.

  When the shielding part 7 is moved vertically downward with respect to the supply pipe 3aa and the discharge pipe 3ab of the inner cooling pipe 3a, as described with reference to FIG. 2B, in the inner cooling pipe 3a. The supply pipe 3aa and the discharge pipe 3ab are in fluid communication via the communication port 7bh of the cylindrical body 7b of the shielding part 7 and the communication port 3ah of the discharge pipe 3ab, and are supplied from the refrigerant supply unit 3c to the supply pipe 3aa. The refrigerant flowing through the inside flows into the discharge pipe 3ab through the communication port 7bh of the cylindrical body 7b of the shielding part 7 and the communication port 3ah of the discharge pipe 3ab, and flows through the inside of the discharge pipe 3ab to supply the refrigerant. It is discharged to the part 3c.

  6 is a view showing an embodiment of a cast body manufactured by the manufacturing apparatus shown in FIG. 1, wherein FIG. 6 (a) is a perspective view thereof, and FIG. 6 (b) is a longitudinal sectional view thereof. It is.

  As shown in FIGS. 6A and 6B, according to the manufacturing apparatus 10 shown in FIG. 1, the upper side is closed by the induction body 1 in the vertical direction, and the lower side is made of the molten metal Mc in the vertical direction in the solidified state. A substantially cylindrical casting Md closed by the closing plate Mda will be manufactured. Here, the induction body 1 used for deriving the molten metal M can be a part of the cast body Md to be manufactured by being made of the same kind of metal as the molten metal. Further, it can be made of a molten metal such as iron and a different metal, and can be separated from the cast body Md and used as an induction body again after the cast body Md is manufactured. The cast Md shown in the drawing has a very high quality because the solidified structure is oriented in one direction by continuously solidifying the molten metal derived from the molten metal surface Ma of the molten metal tank 2. Yes. Further, by moving the outer shape defining member 4 and the inner shape defining member 5 in an arbitrary direction by using a moving means (not shown) while deriving the molten metal M from the molten metal surface Ma of the molten metal M in the molten metal tank 2. It is also possible to manufacture a cast body Md in which the cross-sectional center of the horizontal cross section changes in the horizontal direction at different positions in the vertical direction.

  FIG. 7 is a longitudinal sectional view for explaining a method for producing a cast body using the production apparatus shown in FIG. 1, and is a state in which the molten metal derived from the molten metal tank is solidified following the process shown in FIG. FIG.

  The induction body 1 is separated from the molten metal surface Ma of the molten metal tank 2, and the process shown in FIG. 4 and the process shown in FIG. 5 described above are repeated, so that the molten metal M in the molten metal tank 2 is shown in FIG. A cast body is formed in which a closing plate Mda made of the solid molten metal Mc and continuously extending in the horizontal direction is continuously formed inside the molten metal derived from the molten metal Ma.

  In this way, the refrigerant is supplied to the inside of the molten metal led out from the molten metal surface Ma of the molten metal tank 2, and the refrigerant which is supplied to the inside of the molten metal and becomes a high temperature by heat exchange with the molten metal is used as the metal. By discharging from the inside of the molten metal, it is possible to directly and efficiently cool the inside of the annular molten metal that can be at a relatively high temperature, and shorten the molten metal derived from the molten metal surface Ma of the molten metal tank 2. It can be solidified in time. Further, for example, when the thickness of the cast body to be manufactured is large, the outer cooling pipe 3b is applied together with the inner cooling pipe 3a, and the inner and outer peripheral surfaces of the molten metal derived from the molten metal surface Ma of the molten metal tank 2 are used. By injecting the refrigerant to both sides, the molten metal derived from the molten metal surface Ma of the molten metal tank 2 can be cooled from both the inner peripheral surface and the outer peripheral surface, so that the molten metal can be solidified in a shorter time. The entire molten metal can be cooled and solidified substantially uniformly, and the internal structure of the cast body to be produced can be substantially uniformized. Furthermore, even when the end portion of the molten metal led out from the molten metal surface Ma of the molten metal tank 2 is closed and the internal space of the molten metal is separated from the external environment, the inner cooling pipe 3a is connected. The metal 3 is disposed inside the molten metal M of the molten metal tank 2, and the tip 3 d of the inner cooling pipe 3 a is inserted through the molten metal inside the molten metal led out from the molten metal surface Ma of the molten metal tank 2. By projecting into the internal space of the molten metal, the closed space of the molten metal led out in an annular shape can be reliably cooled using the refrigerant supplied from the supply pipe 3aa of the tip 3d of the inner cooling pipe 3a. Therefore, the degree of freedom of shape of the manufactured cast body Md can be remarkably increased.

  In the above-described embodiment, the mode in which the induction body 1 has a substantially disk shape has been described. However, for example, as shown in FIG. 8, a direction perpendicular to the cylindrical body 1a ′ and the axis of the cylindrical body 1a ′. When using the induction body 1a ′ composed of the disk 1b ′ formed in the above, the steps shown in FIGS. 2 and 3 can be omitted. Further, as the basic shape of the induction body, a cylindrical shape having a cross-sectional polygon such as a quadrangle or a hexagon can be applied in addition to a disk shape or a cylindrical shape. In that case, for example, a polygonal casting having a hollow space inside can be formed.

  Further, the injection pressure and injection amount of the refrigerant injected from the inner cooling pipe 3a and the outer cooling pipe 3b constituting the cooling means 3 are arbitrarily adjusted by a control device provided in the refrigerant supply unit 3c, a control valve (not shown), or the like. can do.

  In the embodiment described above, the refrigerant discharged to the discharge pipe 3ab of the inner cooling pipe 3a is discharged to the refrigerant supply section 3c, cooled by the refrigerant supply section 3c, and again supplied to the supply pipe 3aa of the inner cooling pipe 3a. Although the form supplied to the outer cooling pipe 3b has been described, for example, the refrigerant discharged to the discharge pipe 3ab of the inner cooling pipe 3a may be discharged to the external environment.

  In the above-described embodiment, the embodiment has been described in which a means for directly cooling the molten metal derived from the molten metal surface using the refrigerant is used as the cooling means 3, but it is used for deriving the molten metal. A metallic induction body or a means for indirectly cooling through a solidified portion of a molten metal may be used in combination.

  Furthermore, in the above-described embodiment, the form using a jig such as a spatula, a guide, or a roller as the outer shape defining member 4 or the inner shape defining member 5 has been described. However, a fluid whose flow rate or pressure is controlled is sprayed. The outer shape and inner shape of the cast body may be defined, or the outer shape and inner shape of the cast body may be defined by applying an electromagnetic field.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Inductor, 2 ... Metal molten bath, 3 ... Cooling means, 3a ... Inner cooling pipe, 3aa ... Supply pipe, 3ab ... Discharge pipe, 3ac ... Supply port, 3ad ... Discharge port, 3ae ... Top plate, 3af ... Connection Pipe, 3ag ... Through hole of connecting pipe, 3ah ... Communication port of discharge pipe, 3aA ... End face of supply pipe, 3aB ... Outer peripheral face of connecting pipe, 3aC ... Top face of top plate, 3b ... Outer cooling pipe, 3c ... Refrigerant supply , 3d: tip portion of inner cooling pipe, 4 ... outer shape defining member, 5 ... inner shape defining member, 5A ... upper surface of inner shape defining member, 6 ... moving means, 7 ... shielding portion, 7a ... shielding plate, 7ag ... Shield plate through-hole, 7b ... cylindrical body, 7bh ... cylindrical communication port, 7aA ... side surface of shield plate, 7aB ... inner peripheral surface of through-hole, 7aC ... upper surface of shield plate, M ... molten metal, Ma ... metal Molten metal surface, Mb ... retained molten metal, Mc ... molten metal in solidified state, Md ... cast, Mda ... clogged

Claims (7)

A molten metal tank for storing the molten metal, and a cooling means for cooling and solidifying the molten metal led out from the molten metal surface of the molten metal tank,
The cooling means supplies the refrigerant to the inside of the molten metal led out from the surface of the molten metal through at least the inside of the molten metal of the molten metal tank, and the refrigerant supplied to the inside of the molten metal is annular. An apparatus for producing a cast body, which has a cooling pipe for discharging from the inside of the molten metal led to the inside through the inside of the molten metal in the molten metal tank.   The cooling means is arranged inside the molten metal in order to supply the refrigerant to the inside of the molten metal led out from the molten metal surface of the molten metal tank and to discharge the refrigerant from the inside of the molten metal led out in the annular shape. The casting body manufacturing apparatus according to claim 1, further comprising a shielding portion that shields an opening of the cooling pipe. The cooling pipe is composed of a supply pipe for supplying a refrigerant to the inside of the molten metal and a discharge pipe for discharging the refrigerant from the inside of the molten metal.
The cast body according to claim 2, wherein when the opening of the cooling pipe is shielded by the shielding portion, the supply pipe and the discharge pipe are in fluid communication, and the refrigerant that has flowed through the supply pipe flows to the discharge pipe. Manufacturing equipment.   When the opening of the cooling pipe is shielded by the shielding portion, a portion of the cooling pipe arranged inside the molten metal led out in an annular shape from the molten metal surface of the molten metal tank enters the inside of the molten metal of the molten metal tank. The casting body manufacturing apparatus according to claim 2 or 3, wherein the casting body is immersed.   The said cooling pipe is a manufacturing apparatus of the casting body of Claim 3 which has the double pipe structure by which the discharge pipe was included inside the supply pipe.   4. The casting body manufacturing apparatus according to claim 3, wherein the cooling pipe has a double pipe structure in which a supply pipe is included inside a discharge pipe. A method for producing a cast body in which a molten metal is led out from a molten metal surface of a molten metal tank, and the cast metal having an annular shape is formed by cooling and solidifying the derived molten metal,
The refrigerant is supplied to the inside of the molten metal that is led out from the surface of the molten metal through the inside of the molten metal in the molten metal tank, and the molten metal that is led out to the inside of the molten metal is introduced into the ring. Of casting which is discharged from the inside of the molten metal through the inside of the molten metal in the molten metal tank.

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