JP2015093309A - Up-drawing casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an up-drawing casting apparatus capable of performing casting while suppressing generation of strains of a shape determination member.SOLUTION: An up-drawing casting apparatus (20, 30) includes: a holding furnace (21); a drawing unit (ST); a shape determination member (22); and a cooling-medium feeder (29). The drawing unit (ST) draws up molten metal (M2) from a molten metal surface of molten metal. The shape determination member (22) is installed near the molten metal surface, and determines a sectional shape of a casting (M3) to be cast by applying an external force to held molten metal (M2) that is unsolidified molten metal drawn up by the drawing unit (ST). The cooling medium feeder (29) feeds a cooling medium. The shape determination member (22) includes a channel through which the cooling medium can pass. The cooling-medium feeder (29) flows the cooling medium in the channel.

Description

  The present invention relates to a pull-up casting apparatus.

  Patent Document 1 discloses a free casting method as an innovative casting method that does not require a mold. In such a casting apparatus, after the derivation part is immersed in the molten metal surface that is the surface of the molten metal, when the derivation part is pulled up from the molten metal surface, the molten metal is derived using the surface film and surface tension of the molten metal. Here, it is possible to continuously cast a casting having a continuously changing cross-sectional shape by deriving the molten metal through a shape determining member installed in the vicinity of the molten metal surface.

JP 2012-061518 A

  By the way, in the free casting apparatus disclosed in Patent Document 1, the shape defining member may be distorted by receiving heat from the molten metal.

  For example, there is a pulling type casting apparatus as shown in FIG. FIG. 6 is a schematic diagram of a related pull-up casting apparatus. As shown in FIG. 6, the pull-up casting apparatus 900 includes a holding furnace 901 that holds the molten metal M1, a shape defining member 902 that is installed in the vicinity of the molten metal surface of the molten metal M1, and a lead-out unit ST that derives the molten metal M1. And a cooling nozzle 903. The shape defining member 902 is a plate-like body made of a single layer. The cooling nozzle 903 is installed on the shape defining member 902. The shape defining member 902 may be distorted when heat is applied from the molten metal M1.

  Then, this invention is made | formed against the above-mentioned situation, and it aims at providing the pulling-up type casting apparatus which can suppress the generation | occurrence | production of the distortion of a shape prescription | regulation member and can be cast.

The pull-up casting apparatus according to the present invention is
A holding furnace for holding molten metal;
A lead-out portion for leading out the molten metal from the surface of the molten metal;
A shape defining member that defines a cross-sectional shape of a casting to be cast by applying an external force to the holding molten metal that is installed in the vicinity of the molten metal surface and is derived by the lead-out portion and that is the molten metal before solidification,
A cooling medium supply unit for supplying a cooling medium;
With
The shape defining member has a flow path through which a cooling medium can pass,
The cooling medium supply unit causes the cooling medium to flow through the flow path.

  According to such a configuration, it is possible to perform casting while suppressing the occurrence of distortion of the shape defining member.

  ADVANTAGE OF THE INVENTION According to this invention, generation | occurrence | production of the distortion of a shape prescription | regulation member can be suppressed, and the pull-up type casting apparatus which can be cast can be provided.

1 is a schematic diagram of a lifting type casting apparatus according to a first embodiment. 1 is a schematic diagram of a lifting type casting apparatus according to a first embodiment. 1 is a schematic diagram of a main part of a pull-up casting apparatus according to a first embodiment. FIG. 6 is a schematic diagram of a pulling type casting apparatus according to a second embodiment. FIG. 6 is a schematic diagram of a lifting type casting apparatus according to a third embodiment. It is a schematic diagram of the related pull type casting apparatus.

Embodiment 1 FIG.
The pulling type casting apparatus according to the first embodiment will be described with reference to FIGS. FIG. 1 and FIG. 2 are schematic views of the pulling type casting apparatus according to the first embodiment. More specifically, FIG. 1 is a diagram schematically illustrating a front cross-section of the pull-up casting apparatus according to the first embodiment. FIG. 2 is a diagram schematically illustrating a side cross-section of the pull-up casting apparatus according to the first embodiment. FIG. 3 is a schematic diagram of a main part of the pull-up casting apparatus according to the first embodiment.

  As shown in FIGS. 1 and 2, the pull-up casting apparatus 10 includes a holding furnace 1, a shape defining member 2, a cooling nozzle 3, a starter ST, a heat shield 6, a heat insulating plate 7, and a purge nozzle 8. And the gantry 9. In addition, illustration of the cooling nozzle 3 is abbreviate | omitted in FIG.

  The holding furnace 1 holds the molten metal M1 at a predetermined temperature. Here, as the casting progresses, the surface of the molten metal M1, that is, the molten metal surface decreases. On the other hand, it is good also as a structure which replenishes a molten metal to the holding furnace 1 at any time during casting, and hold | maintains a hot_water | molten_metal surface at fixed height. The molten metal M1 is, for example, aluminum or an aluminum alloy. The molten metal M1 may be a metal or alloy other than aluminum.

  The shape defining member 2 is arranged so as to float on the surface of the molten metal M1. In the example of FIGS. 1 and 2, the shape defining member 2 is disposed so as to contact the molten metal surface. However, the shape defining member 2 may be installed such that the main surface on the lower side (the hot water surface side) thereof does not contact the hot water surface. The shape defining member 2 applies an external force to the molten metal M1 to define the casting shape. The shape defining member 2 is made of, for example, ceramics or stainless steel. The shape defining member 2 is, for example, a plate-like body having an opening that penetrates the main surface. Even if the molten metal M1 is pulled up in contact with the end of the opening, an external force can be applied to the molten metal M1. Further, the shape defining member 2 can be driven, for example, by applying a driving force to a driving unit (not shown). When the shape defining member 2 is driven, an external force can be applied to the molten metal M1.

  Referring to FIG. 1 again, the starter ST is held by a pulling drive device (not shown) so as to be able to contact and separate from the molten metal surface of the molten metal M1. The pulling drive device pulls up the starter ST and pulls up a part of the molten metal M1 in the pulling direction together with the starter ST. The starter ST can reciprocate from the vicinity of the hot water surface to a predetermined height above the hot water surface. A part of the molten metal M1 is pulled up to the starter ST while being cooled.

  The cooling nozzle 3 is connected to a cooling medium supply unit (not shown), and sprays the cooling medium in a predetermined direction. Examples of the cooling medium include air, inert gas, and water. The cooling nozzle 3 is disposed on the upper main surface of the shape defining member 2 so that a cooling medium can be sprayed onto the solidified portion.

  The heat shield 6 is a plate-like body made of a heat shield material. The heat shielding material is, for example, ceramics or stainless steel. Along the wall of the holding furnace 1, it is installed at a distance. As shown in FIG. 3, the heat shield 6 has a laminated structure in which two plates, for example, heat shields 61 and 62 are laminated. The heat shield plate 61 and the heat shield plate 62 are stacked with an interval therebetween so that at least fluid can pass through. As shown in FIGS. 2 and 3, the pipe 63 connects the heat shield unit 6 and the air supply unit (not shown). The heat shield unit 6 is supplied with air from the air supply unit via the pipe 63. The air flows between the heat shield plate 61 and the heat shield plate 62 and is discharged from a predetermined location. Here, the air is preferably discharged so as not to disturb the liquid level of the molten metal M1. In addition, the heat shield part 6 may be a plate-like body having a flow path inside.

  As shown in FIGS. 1 and 2, the heat insulating plate 7 is a plate-like body made of a heat insulating material. The heat insulating material is, for example, ceramics. The heat insulating plate 7 is disposed along the heat shield 6.

The purge nozzle 8 is connected to a purge gas supply unit (not shown) via a pipe 81 and is disposed above the holding furnace 1 while facing a predetermined direction. The purge nozzle 8 injects a purge gas onto the shape defining member 2. Examples of the purge gas include air and inert gas. Examples of the inert gas include N ₂ and Ar.

  The gantry 9 is installed above the holding furnace 1 via the support portion 91. The fixing jig 94 is installed on the gantry 9 and connects the shape defining member 2 to be movable.

  Here, casting is performed using the pull-up casting apparatus 10. Specifically, first, the starter ST is driven to be pulled up, and a part of the molten metal M1 is held and pulled up. Subsequently, the purge nozzle 8 blows the purge gas onto the shape defining member 2, and the heat of the shape defining member 2 is dissipated. The heat shield 6 is supplied with air via a pipe 63. Air flows between the heat shield plate 61 and the heat shield plate 62, and heat is transmitted from the heat shield portion 6 to the air. Air is discharged outside the heat shield 6. The heat insulating plate 7 is arranged along the heat shield 6. Accordingly, the transmission of radiant heat from the molten metal M1 to the casting is suppressed, and the starter ST can derive a part of the molten metal M1 at a high extraction speed. Moreover, a casting can be cast with high molding accuracy. After the derivation, a part of the molten metal M1 is solidified to form a solidified part. The solidified part is separated from the molten metal M1, and a casting is obtained.

  As mentioned above, according to the casting apparatus concerning Embodiment 1, the shaping | molding precision of a casting can be improved. Moreover, the lead-out speed of the casting can be increased. Further, the heat of the shape defining member is dissipated and the shape defining member is not easily distorted.

Embodiment 2. FIG.
Next, the pulling type casting apparatus according to the second embodiment will be described with reference to FIG. FIG. 4 is a schematic diagram of a pull-up casting apparatus according to the second embodiment. The pulling type casting apparatus according to the second embodiment has the same configuration except for the pulling type casting apparatus according to the first embodiment, the shape defining member, and the cooling nozzle. Here, different configurations will be described.

  As shown in FIG. 4, the pulling type casting apparatus 20 includes a shape defining member 22. The shape defining member 22 has a laminated structure in which a plurality of heat insulating layers 221 are laminated. The layer having the upper main surface of the shape defining member 22 is preferably a heat insulating layer 221. The layer having the lower main surface of the shape defining member 22 is preferably a heat insulating layer 221. The shape defining member 22 includes a flow path inside. An air supply pipe 24 and an air discharge pipe 25 are connected to this flow path. The shape defining member 22 is connected to an air supply unit 29 via an air supply pipe 24 and is supplied with air. The supplied air passes through the flow path of the shape defining member 22 and is discharged from the air discharge pipe 25. The air supply unit 29 is preferably installed at a predetermined distance from the holding furnace 1 so as not to be excessively affected by the heat of the molten metal M1.

  Here, casting is performed using the pull-up casting apparatus 20. Specifically, first, the starter ST is driven to be pulled up. The starter ST holds and lifts a part of the molten metal M1. Subsequently, the shape defining member 22 is supplied with air from the air supply pipe 24, and the air passes through the flow path of the shape defining member 22. While passing, heat is transferred from the shape defining member 22 to the air. After passing, the air is discharged from the air discharge pipe 25 to the outside of the shape defining member 22. As a result, the shape defining member 22 is cooled and is not easily distorted. Moreover, since the cooling nozzle 3 receives the heat of the molten metal M1 through the shape defining member 22, the temperature of the cooling nozzle 3 itself is difficult to increase. Thus, transmission of radiant heat from the molten metal M1 to the casting is suppressed, and the starter ST can derive a part M2 of the molten metal M1 at a high extraction speed. Moreover, after derivation | leading-out, some M2 of the molten metal M1 solidifies, and the solidification part M3 is formed with a high shaping | molding precision. If necessary, the solidified part M3 is separated by cutting or the like to obtain a casting.

  As described above, according to Embodiment 2, the shape defining member has a plurality of layers made of a heat insulating material, and suppresses radiant heat from the molten metal. Further, the cooling fluid is caused to flow through the flow path inside the shape defining member to suppress heat storage in the shape defining member. As a result, the molding accuracy of the casting can be improved as in the first embodiment. Moreover, the lead-out speed of the casting can be increased. In addition, the temperature rise of the shape defining member itself can be suppressed, and distortion of the shape defining member can be suppressed.

Embodiment 3 FIG.
Next, the pulling type casting apparatus according to the third embodiment will be described with reference to FIG. FIG. 5 is a schematic diagram of the pulling type casting apparatus according to the third embodiment. The pulling type casting apparatus according to the third embodiment has the same configuration as that of the pulling type casting apparatus 20 according to the second embodiment, to which a heat shield and a purge nozzle are added. Here, different configurations will be described.

  As shown in FIG. 5, the pulling type casting apparatus 30 includes a heat shield part 26 and a purge nozzle 28. The heat shield part 26 has a laminated structure in which a heat shield plate 261 and a heat shield plate 262 are laminated. The heat shield plate 261 and the heat shield plate 262 are stacked with an interval so that at least fluid can pass through. The heat shield 26 is connected to an air supply unit (not shown), and is supplied with air from the air supply unit. The supplied air flows between the heat shield plate 61 and the heat shield plate 62, and is discharged from a predetermined location so as not to disturb the liquid level of the molten metal M1. The heat shield 26 is installed near the periphery of the shape defining member 22. The shape defining member 22 is surrounded by the heat shield 26.

The purge nozzle 28 is connected to a purge gas supply unit and can blow the purge gas in a predetermined direction. The purge nozzle 28 is arranged near the periphery of the shape defining member 22 and inside the heat shield 26. The purge nozzle 28 blows air to the center of the space surrounded by the heat shield 26. That is, the purge nozzle 28 blows the purge gas onto the shape defining portion 22, the cooling nozzle 3, the air supply pipe 24, the air discharge pipe 25, and the like. For example, air or inert gas can be used as the purge gas. Examples of the inert gas include N ₂ and Ar.

  Here, casting is performed by using the pulling type casting apparatus 30. Specifically, first, the starter ST is driven to be pulled up, and a part of the molten metal M1 is held and pulled up. Subsequently, the purge nozzle 28 blows the purge gas. Then, the heat of the shape defining member 22, the cooling nozzle 23, the air supply pipe 24, etc. is transmitted to the purge gas. That is, the shape defining member 22, the cooling nozzle 23, the air supply pipe 24, and the like dissipate heat. Thereby, the heat storage from the molten metal M1 can be dissipated and cooling can be accelerated | stimulated. Thus, transmission of radiant heat from the molten metal M1 to the casting is suppressed, and the starter ST can derive a part M2 of the molten metal M1 at a high extraction speed. After derivation, a part M2 of the molten metal M1 is solidified to form a solidified part M3. If necessary, the solidified part M3 is separated by cutting or the like to obtain a casting.

  As mentioned above, according to the pull-up type casting apparatus concerning Embodiment 3, like the pull-up type casting apparatus concerning Embodiment 1 and 2, the heat-shielding part and the heat insulation board are installed, and the radiant heat from molten metal Can be cut off. In addition, by performing air purge inside the heat shield, heat storage from a cooling nozzle or the like installed inside the heat shield is released. Thereby, the molding accuracy of the casting can be improved. Moreover, the lead-out speed of the casting can be increased.

  Further, in the pull-up casting apparatus according to the third embodiment, when an inert gas is used as the purge gas, oxidation of the molten metals M1 and M2 is suppressed. Thereby, the quality of the casting (solidified part M3) surface can be improved.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the shape defining member of the casting apparatus according to the second and third embodiments may be applied to the casting apparatus according to the first embodiment.

DESCRIPTION OF SYMBOLS 10, 20, 30 ... Pull-up type casting apparatus 1 ... Holding furnace 2, 22 ... Shape-defining member 3 ... Cooling nozzle 6, 26 ... Heat shield part 7 ... Heat insulation board 8, 28 ... Purge nozzle 23 ... Cooling nozzle 24 ... Air supply Pipe 25 ... Air discharge pipe 29 ... Air supply part 221 ... Heat insulation layer M1, M2, M3 ... Molten metal ST ... Starter

Claims (1)

A holding furnace for holding molten metal;
A lead-out portion for leading out the molten metal from the surface of the molten metal;
A shape defining member that defines a cross-sectional shape of a casting to be cast by applying an external force to the holding molten metal that is installed in the vicinity of the molten metal surface and is derived by the lead-out portion and that is the molten metal before solidification,
A cooling medium supply unit for supplying a cooling medium;
With
The shape defining member has a flow path through which a cooling medium can pass,
The cooling medium supply unit is a pulling type casting apparatus for flowing the cooling medium through the flow path.

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