JP4122308B2 - Metal slurry manufacturing apparatus and ingot manufacturing apparatus - Google Patents

Description

  The present invention relates to a metal slurry manufacturing apparatus for manufacturing a metal slurry in a semi-molten (semi-solid) state in which a metal in a molten (liquid phase) state and a metal in a solid (solid phase) state are mixed, and a semi-melt (semi-solid state) This relates to an ingot producing apparatus for producing an ingot from a metal slurry in a state).

In general, as the casting method using the rheology and thixotropy of semi-molten and semi-solid metal, that is, the low viscosity and excellent fluidity, the former is the rheocast method (semi-solid cast method), As the latter, a thixocasting method (semi-melt casting method) is known.
In any of these casting methods, casting is performed using a metal slurry in a semi-molten / semi-solid state in which molten liquid phase metal and solid phase metal are mixed.

The cast structure of various metals including ingots and cast magnesium alloys produced by the casting method described above must have no crystal orientation, good mechanical properties, and little segregation of components. Therefore, it is desirable that the whole is a fine sphere.
Therefore, in order to make the cast structure finer and spherical, for example, a micronizing agent is added to the molten metal, or electromagnetic stirring or mechanical stirring is given to the molten metal.
JP-A-10-128516

However, when adding a micronizing agent to molten metal, it cannot be applied to all metals, and is limited to aluminum alloys and magnesium alloys, and is limited to the micronizing agent addition temperature and the retention time after micronizing agent addition. There is.
In addition, when electromagnetic stirring or mechanical stirring is applied to the molten metal, the apparatus becomes larger and the energy cost increases.

This invention was made based on the “equal axis crystal liberation theory” proposed by Professor Tetsuichi Mogi of Chiba Institute of Technology and has the following contents.
(1) A melting furnace for producing a molten metal of a magnesium alloy or an aluminum alloy, a discharge mechanism for discharging the supernatant of the molten metal from the melting furnace while leaving impurities of the molten metal in the melting furnace, and the melting furnace wherein the molten metal discharge control mechanism which controls the discharge amount of the supernatant of the molten metal to be discharged through the discharge mechanism, the supernatant of the molten metal discharged through the discharge mechanism from the melting furnace is cooled from the half A holding furnace that is held in a molten state, a cooling body that is buried in the supernatant of the molten metal in the holding furnace and that has a temperature lower than the melting point of the molten metal, and the cooling body is rotated in one direction. It is a metal slurry manufacturing apparatus provided with the cooling body drive mechanism stopped periodically or reversed with a fixed period.
(2) A melting furnace for producing a molten metal of a magnesium alloy or an aluminum alloy, a discharge mechanism for discharging the supernatant of the molten metal from the melting furnace while leaving impurities of the molten metal in the melting furnace, and the melting furnace wherein the molten metal discharge control mechanism for controlling the emissions of the supernatant of the molten metal to be discharged through the discharge mechanism, the supernatant of the molten metal discharged through the discharge mechanism from the melting furnace is poured from A cooling body having a temperature lower than the melting point of the molten metal, and a cooling body driving mechanism for rotating the cooling body in one direction, rotating in one direction, stopping periodically, or reversing the cooling body at a constant period When a metal slurry production apparatus and a holding furnace for holding and cooling the supernatant of the molten metal from the cooling body in a semi-molten state.
(3) In the metal slurry manufacturing apparatus according to (1) or (2), a cooling body cooling mechanism for circulating a refrigerant through the cooling body is provided.
(4) In the metal slurry manufacturing apparatus according to (3), a coolant cooling mechanism for cooling the coolant is provided.
(5) A melting furnace for producing a molten metal of a magnesium alloy or an aluminum alloy, a discharge mechanism for discharging the supernatant of the molten metal from the melting furnace while leaving impurities of the molten metal in the melting furnace, and the melting furnace a mold for casting a molten metal discharge control mechanism for controlling the emissions of the supernatant of the molten metal to be discharged through the discharge mechanism, the supernatant of the molten metal discharged through the discharge mechanism from the melting furnace from , the mold is rotated in one direction periodically stopped by, or a ingot manufacturing apparatus comprising a mold driving mechanism for reversing at a fixed period, and to that casting mold cooling mechanism cooling the mold.
(6) A melting furnace for generating a molten metal of a magnesium alloy or an aluminum alloy, a discharge mechanism for discharging the supernatant of the molten metal from the melting furnace while leaving impurities of the molten metal in the melting furnace, and the melting furnace cooling the molten metal discharge control mechanism for controlling the emissions of the supernatant of the molten metal to be discharged through the discharge mechanism, the supernatant of the molten metal discharged through the discharge mechanism from the melting furnace is poured from and body, the cooling body is rotated in one direction, or rotate in one direction periodically stopped by, or a cooling member driving mechanism for reversing at a constant period, of the molten metal from the cooling body and the mold for casting the supernatant is ingot manufacturing apparatus and a that casting mold cooling mechanism to cool the mold.
(7) In the ingot manufacturing apparatus according to (6) , a mold driving mechanism is provided in which the mold is rotated in one direction and periodically stopped or inverted at a constant period.
(8) The ingot manufacturing apparatus according to (6) or (7) is characterized in that a cooling body cooling mechanism for circulating a coolant through the cooling body is provided.
(9) In the ingot production device according to (8), characterized in that a refrigerant cooling mechanism you cool the refrigerant.
(10) In the ingot manufacturing apparatus according to any one of (5) to (9) , the mold cooling mechanism is configured by a cooling tank and a refrigerant accommodated in the cooling tank. Features.
(11) In the ingot production device according to (10), characterized in that a refrigerant cooling mechanism you cool refrigerant of the mold cooling mechanism.

According to the metal slurry manufacturing apparatus of the present invention, since the molten metal is a magnesium alloy or an aluminum alloy, when casting the metal slurry as a spherical crystal, the finishing time of the casting can be shortened and the number of finishing steps can be reduced. it can.
Also, a discharge mechanism that discharges the molten metal supernatant from the melting furnace while leaving impurities in the molten metal in the melting furnace, and a molten metal discharge that controls the discharge amount of the molten metal supernatant discharged from the melting furnace through the discharge mechanism Since the control mechanism is provided, a clean magnesium alloy can be obtained and a good metal slurry can be obtained.
Then, the cooling body buried in the supernatant of the molten metal is rotated in one direction and periodically stopped, or inverted at a constant period, so that crystals generated on the surface of the cooling body are released at the initial stage. Or the cooling body into which the molten metal supernatant is poured is rotated in one direction, rotated in one direction and stopped periodically, or inverted at a constant cycle, Since the crystals generated on the surface are released in the initial stage, a metal slurry with fine spherical crystals can be manufactured without increasing the size of the device and increasing the energy cost compared to mechanical or electromagnetic stirring devices. can do.
Furthermore, since the cooling body cooling mechanism for circulating the coolant through the cooling body is provided, a metal slurry having fine spherical crystals can be efficiently generated.
And, since there is provided a refrigerant cooling mechanism you cool the refrigerant, it is possible to hold the cooling body at a constant temperature, Ru can be generated efficiently metal slurry having fine spherical crystals.
Next, according to the ingot manufacturing apparatus of the present invention, since the molten metal is a magnesium alloy or an aluminum alloy, the finishing time of the casting can be shortened and the number of finishing steps can be reduced.
Also, a discharge mechanism that discharges the molten metal supernatant from the melting furnace while leaving impurities in the molten metal in the melting furnace, and a molten metal discharge that controls the discharge amount of the molten metal supernatant discharged from the melting furnace through the discharge mechanism Since the control mechanism is provided, a clean magnesium alloy can be obtained and a good ingot can be obtained.
Then, by rotating the mold in one direction and periodically stopping it or reversing it at a fixed period, the crystals generated on the inner surface of the mold are released in the initial stage, so that mechanical stirring and electromagnetic stirring devices can be used. In comparison, the cast structure of various metals can be made into a fine spherical shape as a whole without increasing the size of the apparatus and without increasing the energy cost.
Moreover, according to the ingot manufacturing apparatus of this invention, the cooling body into which the molten metal is poured is rotated in one direction, rotated in one direction, periodically stopped, or inverted at a constant cycle. In this way, the crystals generated on the surface of the cooling body are liberated at an initial stage, and further, the mold is rotated in one direction and periodically stopped, or inverted at a constant period, thereby the inner surface of the mold. The crystals produced in the initial stage are liberated at an initial stage, so that the cast structure of various metals can be refined as a whole without increasing the size of the device and increasing the energy cost compared to mechanical stirring and electromagnetic stirring. Can be spherical.
Furthermore, since the cooling body cooling mechanism for circulating the coolant through the cooling body is provided, a cast structure of fine spherical crystals can be efficiently generated.
And, since there is provided a refrigerant cooling mechanism you cool the refrigerant, it is possible to hold the cooling body at a constant temperature, it is possible to efficiently generate the cast structure of fine spherical crystals.
Furthermore, since the mold cooling mechanism is composed of the cooling tank and the refrigerant accommodated in the cooling tank, a cast structure of fine spherical crystals can be efficiently generated.
And, since there is provided a refrigerant cooling mechanism you cool the refrigerant of the mold cooling mechanism, it is possible to hold the mold at a constant temperature, Ru can be generated efficiently cast structure of fine spherical crystals.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an explanatory view showing a schematic configuration of a continuous cast bar manufacturing apparatus to which a metal slurry manufacturing apparatus according to a first embodiment of the present invention is applied.

In FIG. 1, a continuous cast bar manufacturing apparatus I includes a melting furnace 11 that melts a metal into a molten metal M of a magnesium alloy, and a melting furnace temperature adjustment mechanism that adjusts the temperature in the melting furnace 11 to a desired melting temperature. 17, a molten metal discharge control mechanism 21 that controls the discharge amount of the molten metal M discharged from the melting furnace 11, and a holding furnace 31 that cools the molten metal M discharged from the melting furnace 11 and holds it in a semi-molten state. The holding furnace temperature adjusting mechanism 37 for adjusting the temperature in the holding furnace 31 to a desired cooling temperature, and cooling at a constant temperature lower than the melting point of the molten metal M buried in the molten metal M in the holding furnace 31. The body 41 and the cooling body drive mechanism 51 that rotates the cooling body 41 in one direction and periodically stops it, for example, rotates the cooling body 41 for 1 second and stops it for 1 second continuously in one direction. And refrigerant in the cooling body 41 A cooling body cooling mechanism 61 to be circulated, a refrigerant cooling mechanism 71 for cooling the refrigerant of the cooling body cooling mechanism 61, a tundish 81 to which the metal slurry U is supplied from the holding furnace 31, and the metal slurry U in the tundish 81 It comprises a water-cooled mold 91 that cools and casts a continuous casting rod B.
In addition, the metal slurry manufacturing apparatus S is comprised by the part except the water-cooling casting_mold | template 91. FIG.

The melting furnace 11 described above is open at the top and has a melting furnace main body 12 provided with a discharge passage 12a on the side wall, a heater 14 embedded in the melting furnace main body 12, and a lid for closing the upper side of the melting furnace main body 12. It consists of a body 15.
The bottom of the melting furnace body 12 is provided with a dross remover 16 for taking out precipitated impurities, for example, dross.

The melting furnace temperature adjusting mechanism 17 described above supplies power to the heater 14 so that the thermocouple 18 as a temperature measuring instrument for measuring the temperature in the melting furnace 11 and the temperature detected by the thermocouple 18 become the set melting temperature. And an energization control unit 19 for stopping the supply of power to the heater 14.
The temperature in the melting furnace 11 is set to a temperature equal to or higher than the liquidus temperature of the alloy in order to generate the molten metal M of the magnesium alloy by the melting furnace temperature adjusting mechanism 17.

  The molten metal discharge control mechanism 21 includes a heat resistance control rod 22 inserted into an insertion hole 15 a provided in the lid 15 of the melting furnace 11, and the heat resistance control rod 22 inserted into the melting furnace 11. The control rod driving unit 23 discharges the molten metal M from the discharge path 12a.

  The holding furnace 31 described above has an opening 32a connected to the discharge path 12a of the melting furnace main body 12 at the top of the side wall, and a holding furnace main body 32 provided with a discharge port 32b at the bottom. The heater 33 embedded in the holding furnace main body 32 and a lid 34 that closes the upper side of the holding furnace main body 32 are configured.

The holding furnace temperature adjusting mechanism 37 includes a thermocouple 38 as a temperature measuring instrument for measuring the temperature in the holding furnace 31, and a heater so that the temperature detected by the thermocouple 38 becomes a set holding (cooling) temperature. The power supply control unit 39 is configured to supply power to 33 or stop supplying power to the heater 33.
The holding furnace 31 described above is set to a temperature below the liquidus temperature of the magnesium alloy and above the solidus temperature of the magnesium alloy by the holding furnace temperature adjusting mechanism 37.
Here, the temperature in the holding furnace 31 is set to a temperature below the liquidus temperature of the magnesium alloy and above the solidus temperature of the magnesium alloy because the spherical crystals generated by the cooling body 41 rotate the cooling body 41. This is based on the reason that the slurry in the semi-molten state is maintained without being dissolved or disappearing after being released from the surface of the cooling body 41 due to vibration caused by the stop, and not completely solidified.

  The above-described cooling body 41 is constituted by, for example, a disk having smoothness or unevenness (a shape constricted to the lower side), and a flow path (not shown) for circulating the refrigerant of the cooling body cooling mechanism 61 is provided. .

The cooling body drive mechanism 51 described above is rotatably supported by the lid body 34 of the holding furnace 31, and has a rotating shaft 52 with the center of the cooling body 41 attached to the lower end, and the rotating shaft 52 is rotated in one direction. It is comprised with the drive part 53 stopped periodically.
The rotating shaft 52 is provided with two flow paths (not shown) having one end connected to both ends of the flow path for circulating the refrigerant of the cooling body 41 in the axial direction.

  The above-described cooling body cooling mechanism 61 is connected to the other end of each flow path of the rotating shaft 52 constituting the cooling body driving mechanism 51 via a swivel joint (not shown), for example, and circulates the refrigerant to the cooling body 41. The piping 62 to be made to pass, the refrigerant | coolant storage part 63 provided in the middle of this piping 62, and the pump 64 which is provided in the middle of the pipe 62 and flows the refrigerant | coolant in the refrigerant | coolant storage part 63 to the cooling body 41 are comprised.

The above-described refrigerant cooling mechanism 71 cools the refrigerant in the refrigerant reservoir 63 constituting the cooling body cooling mechanism 61.
The above-described cooling body 41 has a solid temperature of the magnesium alloy at a constant temperature lower than the melting point of the molten metal M, for example, below the liquidus temperature of the magnesium alloy, by the refrigerant cooling mechanism 71 and the cooling body cooling mechanism 61. The temperature is set higher than the line temperature.
Here, the temperature of the cooling body 41 is set to a temperature not higher than the liquidus temperature of the magnesium alloy and not lower than the solidus temperature of the magnesium alloy because the spherical crystals generated by the cooling body 41 rotate the cooling body 41. This is based on the reason that the slurry in the semi-molten state is maintained without being dissolved or disappeared after being released from the surface of the cooling body 41 due to the vibration caused by the stop and without being completely solidified.

  The above-described tundish 81 is open upward and has a discharge port 81a on the side wall.

  The above-described water-cooled mold 91 is attached to the side wall of the holding furnace 81 so as to surround the discharge port 81a.

Next, manufacture of the continuous casting rod B will be described.
First, a predetermined metal is introduced into the melting furnace main body 12, the melting furnace main body 12 is closed with the lid 15, and the melting furnace main body 12 is heated with the heater 14 to melt the metal, thereby melting the molten metal of the magnesium alloy. M is generated.
And the molten metal M is discharged | emitted from the discharge path 12a in the holding furnace main body 32 by driving and lowering the heat-resistant control rod 22 with the control rod drive part 23. FIG.

When the molten metal M is discharged in this way, since the magnesium alloy has the smallest specific gravity among the practical metals, most impurities and compounds are precipitated at the bottom of the melting furnace body 12, so the supernatant of the molten metal M is discharged. Thus, the molten metal M from which most impurities and compounds have been removed can be supplied to the holding furnace body 32.
Impurities that precipitate on the bottom of the melting furnace main body 12 are called dross. If this dross is mixed, it does not become a clean magnesium alloy but becomes a defective product, so that the heat-resistant control rod 22 can be lowered and discharged. The amount of the metal M is desirably 70% to 80% of the volume in the melting furnace body 12 below the lower end of the discharge passage 12a.
The dross deposited on the bottom of the melting furnace body 12 may be discharged by appropriately operating the dross remover 16.

The molten metal M discharged into the holding furnace main body 32 as described above comes into contact with the surface of the cooling body 41 and is cooled to become nucleation and spherical crystals, and adhere to the surface of the cooling body 41.
However, since the cooling body 41 is rotated in one direction by the cooling body drive mechanism 51 and periodically stopped, the spherical crystals are released from the cooling body 41 while growing and settle to the bottom of the holding furnace body 32. To do.

The molten metal M on the bottom side of the holding furnace body 32 on which the spherical crystals generated as described above are precipitated becomes a semi-molten metal slurry U and is discharged from the discharge port 32b to the tundish 81.
Then, after the metal slurry U stored in the tundish 81 is cast into the continuous casting rod B using the dummy bar D, the continuous casting rod B is cut into a predetermined length to form a billet (L).
This billet (L) is used for forging, casting or the like, or is heated to a semi-molten state and semi-molten processed as necessary.

  FIG. 2 shows a solidification structure of a continuous cast bar manufactured by a continuous cast bar manufacturing apparatus without a cooling body or the like by an optical microscope, and a continuous cast bar B manufactured by the continuous cast bar manufacturing apparatus I of the first embodiment of the present invention. FIG. 3 shows the solidified structure of the optical microscope.

As can be seen from FIG. 2, the solidification structure of the continuous cast bar manufactured by the continuous cast bar manufacturing apparatus without a cooling body grows to a size of several hundred μm.
However, the solidified structure of the continuous cast bar B manufactured by the continuous cast bar manufacturing apparatus I according to the first embodiment of the present invention is a fine spherical crystal of 10 μm to 200 μm, as can be seen from FIG.

As described above, according to the metal slurry manufacturing apparatus S of the first embodiment of the present invention, the crystal generated on the surface of the cooling body 41 is rotated by rotating the cooling body 41 in one direction and periodically stopping the crystal. Since it is released at the initial stage, the metal slurry U having fine spherical crystals can be produced without increasing the size of the apparatus and without increasing the energy cost as compared with mechanical stirring and electromagnetic stirring.
Furthermore, since the cooling body cooling mechanism 61 for circulating the coolant through the cooling body 41 is provided, the metal slurry U having fine spherical crystals, for example, 10 μm to 200 μm spherical crystals can be efficiently generated.
And since the refrigerant | coolant cooling mechanism 71 which cools a refrigerant | coolant was provided, the cooling body 41 can be hold | maintained to fixed temperature, and the metal slurry U which has a fine spherical crystal can be produced | generated efficiently.
Furthermore, since the molten metal M is a magnesium alloy, a billet (L) having fine spherical crystals can be manufactured. Forging and casting using this billet (L), the finishing time can be shortened and the number of finishing steps can be reduced. In addition, when the metal slurry U is cast as a spherical crystal, the finishing time of the casting can be shortened and the number of finishing steps can be reduced.

  4 and 5 are explanatory views showing a schematic configuration of an ingot manufacturing apparatus according to a second embodiment of the present invention.

  In FIG. 4 or FIG. 5, the ingot manufacturing apparatus P includes a melting furnace 111 that melts a metal to make a molten metal M of a magnesium alloy, and a melting furnace temperature that adjusts the temperature in the melting furnace 111 to a desired melting temperature. The adjustment mechanism 117, the molten metal discharge control mechanism 121 for controlling the discharge amount of the molten metal M discharged from the melting furnace 111, the mold 131 to which the molten metal M is supplied from the melting furnace 111, and the mold 131 in one direction. Rotating and periodically stopping, for example, a mold driving mechanism 141 that repeatedly rotates the mold 131 for one second and stops for one second continuously in one direction, a mold cooling mechanism 151 that cools the mold 131, and this The coolant cooling mechanism 161 cools the coolant 153 of the mold cooling mechanism 151.

The melting furnace 111 described above includes a melting furnace main body 112 that is open at the top, and a discharge pipe 113 that passes through the bottom of the melting furnace main body 112 and is watertightly attached, and whose upper end is located at a predetermined position in the melting furnace main body 112. The heater 114 embedded in the melting furnace body 112 and the lid body 115 that closes the upper part of the melting furnace body 112 are configured.
The bottom of the melting furnace body 112 is provided with a dross remover 116 for taking out impurities that precipitate, for example, dross.

The melting furnace temperature adjustment mechanism 117 described above supplies power to the heater 114 so that the thermocouple 118 as a temperature measuring instrument for measuring the temperature in the melting furnace 111 and the temperature detected by the thermocouple 118 become the set melting temperature. And an energization control unit 119 that stops the supply of power to the heater 114.
The temperature in the melting furnace 111 is set to a temperature equal to or higher than the liquidus temperature of the alloy in order to generate the molten metal M of the magnesium alloy by the melting furnace temperature adjusting mechanism 117.

  The above-described molten metal discharge control mechanism 121 includes a heat resistance control rod 122 inserted into an insertion hole 115 a provided in the lid body 115 of the melting furnace 111 and the heat resistance control rod 122 inserted into the melting furnace 111. The control rod driving unit 123 is configured to discharge the molten metal M from the discharge pipe 113.

  The above-described mold 131 includes, for example, a cylindrical mold body 132 having one end (upper side) opened and a flange portion 133 provided on the outer periphery of one end (upper side) of the mold body 132.

In the state where the mold main body 132 is penetrated, the mold driving mechanism 141 described above periodically rotates the mold holding part 142 in which the flange 133 is detachably fixed to the upper end and rotates the mold holding part 142 in one direction. And a drive unit 143 that stops the operation.
The drive unit 143 includes a driven gear 144 attached to the outer periphery of the lower end of the mold holding unit 142, a drive gear 145 that meshes with the driven gear 144, and a motor 146 that drives the drive gear 145.

  The mold cooling mechanism 151 described above includes a cooling tank 152 and a refrigerant 153 accommodated in the cooling tank 152.

The refrigerant cooling mechanism 161 described above includes a pipe 162 whose both ends are connected to the cooling tank 152, a refrigerant cooling unit 163 provided in the middle of the pipe 162, and a refrigerant in the cooling tank 152 provided in the middle of the pipe 162. And a pump 164 for circulating 153.
The refrigerant 153 described above is set to a constant temperature lower than the melting point of the molten metal M, for example, a temperature equal to or lower than the liquidus temperature of the magnesium alloy by the refrigerant cooling mechanism 161.
Here, the temperature of the refrigerant 153 is set to a temperature equal to or lower than the liquidus temperature of the magnesium alloy because the crystal generated on the inner surface of the mold body 132 vibrates due to rotation and stoppage of the mold body 132. This is based on the reason that it does not re-melt when moved into the semi-solid state metal slurry U.

Next, manufacture of the ingot N is demonstrated.
First, a predetermined metal is put into the melting furnace body 112 in the state shown in FIG. 4, the melting furnace body 112 is closed with the lid 115, and the melting furnace body 112 is heated with the heater 114 to melt the metal. The molten metal M of the magnesium alloy is generated.
Then, a predetermined amount of molten metal M is discharged from the discharge pipe 113 into the mold 131 by driving and lowering the heat resistant control rod 122 by the control rod driving unit 123.

When the molten metal M is discharged in this manner, the amount of the molten metal M that can be discharged by lowering the heat resistance control rod 122 is lower than the upper end of the discharge pipe 113 in order to discharge a clean magnesium alloy that does not contain dross. It is desirable that it is 70% to 80% of the volume of the lower melting furnace main body 112.
The dross deposited on the bottom of the melting furnace body 112 may be discharged by appropriately operating the dross remover 116.

The predetermined amount of molten metal M discharged into the mold body 132 as described above comes into contact with the inner surface of the mold body 132 and is cooled, so that nucleation and crystals grow into a spherical shape. Adhere to the inner surface of 132.
However, since the mold 131 is rotated in one direction by the mold driving mechanism 141 and periodically stopped, the spherical crystals are released from the inner surface of the mold body 132 while growing, and sequentially toward the bottom of the mold body 132. Precipitates into ingot N.

Next, after the molten metal M supplied into the mold main body 132 is solidified into an ingot N, the mold drive mechanism 141 is stopped and the mold 131 is stopped from rotating, as shown in FIG. Then, the mold drive moving mechanism (not shown) is operated, the mold 131 is removed from the mold holding part 142, another mold 131 is set on the mold holding part 142, each part is returned to the position of FIG. Mass N is produced.
On the other hand, the mold 131 removed from the mold holding part 142 is turned upside down to discharge the ingot N, and then the inner peripheral surface is cleaned to prepare for the next use.

  FIG. 6 shows a solidified structure by an optical microscope obtained by reheating and solidifying an ingot produced by an ingot producing apparatus having no mold drive mechanism or the like, and produced by the ingot producing apparatus P of the second embodiment of the present invention. FIG. 7 shows a solidified structure obtained by re-heating and solidifying the ingot N which has been solidified.

As can be seen from FIG. 6, the solidified structure of the ingot manufactured by the ingot manufacturing apparatus without a mold drive mechanism or the like grows to a size of several hundred μm.
However, the solidified structure of the ingot N manufactured by the ingot manufacturing apparatus P according to the second embodiment of the present invention is a fine spherical crystal of 10 μm to 200 μm, as can be seen from FIG.

As described above, according to the ingot manufacturing apparatus P of the second embodiment of the present invention, the crystals generated on the inner surface of the mold 131 are initialized by rotating the mold 131 in one direction and periodically stopping it. Since it is released in stages, the cast structure is made into a fine spherical shape, for example, 10 μm to 200 μm as a whole without increasing the size of the device and increasing the energy cost compared to mechanical stirring and electromagnetic stirring. be able to.
Furthermore, since the mold cooling mechanism 151 includes the cooling tank 152 and the refrigerant 153 accommodated in the cooling tank 152, a fine spherical crystal cast structure can be efficiently generated.
Since the coolant cooling mechanism 161 for cooling the coolant 153 is provided, the mold 131 can be maintained at a constant temperature, and a cast structure of fine spherical crystals can be efficiently generated.
Furthermore, since the molten metal M is a magnesium alloy, the finishing time of the ingot N can be shortened, and the number of finishing steps can be reduced.

  FIG. 8 is an explanatory view corresponding to a side sectional view showing a schematic configuration of another example of the melting furnace used in the continuous casting bar manufacturing apparatus or the ingot manufacturing apparatus.

  In FIG. 8, melting furnaces 11 and 111 include melting furnace bodies 12 and 112 that are open at the top, and crucibles 12A and 112A as inner containers that are removably accommodated in the melting furnace bodies 12 and 112, The crucibles 12A and 112A are penetrated through the bottoms of the crucibles 12A and 112A, and are attached in a liquid-tight manner. 113, heaters 14 and 114 embedded in the melting furnace bodies 12 and 112, and lid bodies 15 and 115 that close the top of the melting furnace bodies 12 and 112.

The melting furnace temperature adjusting mechanisms 17 and 117 are thermocouples 18 and 118 as temperature measuring instruments for measuring the temperature in the melting furnaces 11 and 111, and the melting temperature set by the temperature detected by the thermocouples 18 and 118. It is comprised with the electricity supply control parts 19 and 119 which supply electric power to the heaters 14 and 114 so that it may become, or stop supply of electric power to the heaters 14 and 114.
The temperatures in the melting furnaces 11 and 111 are set to be equal to or higher than the liquidus temperature of the magnesium alloy in order to generate the molten metal M of the magnesium alloy by the melting furnace temperature adjusting mechanisms 17 and 117.

  And the molten metal discharge | emission control mechanisms 21 and 121 are the heat resistance control rods 22 and 122 inserted in the insertion holes 15a and 115a provided in the cover bodies 15 and 115 of the melting furnaces 11 and 111, and this heat resistance control rod. 22 and 122 are inserted into the melting furnaces 11 and 111, and control rod drive units 23 and 123 for discharging the molten metal M from the discharge pipes 13 and 113, respectively.

Next, the melting furnaces 11 and 111 will be described.
Since the dross removal is not provided in the melting furnaces 11 and 111, if a predetermined amount of the molten metal M is completely discharged and a slight amount of the molten metal M and dross remain, the lid 15 and 115 is opened and crucibles 12A and 112A are taken out from melting furnace main bodies 12 and 112, and new crucibles 12A and 112A are accommodated in melting furnace main bodies 12 and 112 as shown in FIG .
Then, a predetermined metal is put into the crucibles 12A and 112A, the melting furnace bodies 12 and 112 are closed with the lid bodies 15 and 115, and the melting furnace bodies 12 and 112 are heated with the heaters 14 and 114 to melt the metal. As a result, the molten metal M of the magnesium alloy is generated.
Thereafter, similarly to the above description, the molten metal discharge control mechanisms 21 and 121 are operated to sequentially discharge the molten metal M by a predetermined amount.

Since the melting furnaces 11 and 111 are provided with crucibles 12A and 112A in place of dross removal, by replacing the crucibles 12A and 112A, the dross is removed from the dross and the molten metal M is newly generated. A new molten metal M can be generated.
Therefore, the metal slurry U or the ingot N can be manufactured efficiently.
For example, if the crucibles 12A and 112A taken out from the melting furnace main bodies 12 and 112 contain water, dross or the like is solidified due to a change over time and can be taken out.
Therefore, the crucibles 12A and 112A from which the solid dross and the like are removed can be prepared for the next use by cleaning the inner peripheral surface.

In both of the above-described embodiments, the molten metal M of the magnesium alloy to be handled is easily oxidized. Therefore, it is desirable to carry out in an inert atmosphere, for example, an argon gas, sulfur hexafluoride (SF ₆ ) gas and carbon dioxide mixed gas atmosphere. .
Although it described in the example in which the molten metal M of a magnesium alloy, the present invention can be applied to the aluminum alloy.
The example in which the cooling body 41 or the mold 131 is rotated in one direction and periodically stopped is shown, but the same effect can be obtained even if the cooling body 41 or the mold 131 is inverted at a constant period, for example, a one-second period. Can be obtained.

Next, in the first embodiment, the example in which the continuous casting rod B and the billet (L) are manufactured has been described. However, the metal slurry U can be used to manufacture a plate.
Then, in the first embodiment, the molten metal discharged from the melting furnace is poured into a cooling body having a (constant) temperature lower than the melting point of the molten metal, and this cooling body is rotated in one direction by the cooling body driving mechanism. Or by rotating in one direction and stopping periodically, or by reversing at a fixed period, the crystal generated on the surface of the cooling body is liberated in the initial stage, and the molten metal from the cooling body is cooled in a holding furnace. Thus, even if the structure is maintained in a semi-molten state, the same effect as in the first embodiment can be obtained.
In this case, it is desirable to provide a cooling body cooling mechanism for circulating the refrigerant through the cooling body and a cooling mechanism for cooling the refrigerant.

Next, although the example which manufactures the column-shaped ingot N was demonstrated in 2nd Example, a casting (ingot) can be directly manufactured by casting for casting manufacture.
In the second embodiment, when removing the mold 131 from the mold holding part 142, the mold 131, the mold driving mechanism 141 and the mold cooling mechanism 151 are sufficiently lowered by a mechanism not shown in the drawing, or the melting furnace 111 and The molten metal discharge control mechanism 121 is moved onto the mold 131 provided in the left or right direction by a mechanism not shown in the figure, and the mold 131 which has finished producing the ingot N while producing the ingot N is removed. Also good.
In the second embodiment, the molten metal discharged from the melting furnace is poured into a cooling body having a temperature lower than the melting point of the molten metal (constant), and the cooling body is rotated in one direction by the cooling body drive mechanism. Or by rotating in one direction and stopping periodically or reversing at a fixed period, the crystal generated on the surface of the cooling body is released in the initial stage, and the molten metal from the cooling body is cast into a mold. Even if the mold is cooled by the mold cooling mechanism, the same effect as in the second embodiment can be obtained.
In this case, a mold driving mechanism that rotates the mold in one direction and periodically stops or reverses the mold at a constant period, a cooling body cooling mechanism that causes the coolant to flow through the cooling body, and a cooling body cooling mechanism It is desirable to provide a refrigerant cooling mechanism for cooling the refrigerant.

It is explanatory drawing which shows schematic structure of the continuous cast bar manufacturing apparatus to which the metal slurry manufacturing apparatus which is 1st Example of this invention is applied. It is a copy of the optical micrograph which shows the solidification structure | tissue of the continuous cast bar manufactured with the conventional continuous cast bar manufacturing apparatus. It is a copy of the optical microscope photograph which shows the solidification structure | tissue of the continuous cast bar manufactured with the continuous cast bar manufacturing apparatus of 1st Example of this invention. It is explanatory drawing which shows schematic structure of the ingot manufacturing apparatus which is 2nd Example of this invention. It is explanatory drawing which shows schematic structure of the ingot manufacturing apparatus which is 2nd Example of this invention. It is a copy of the optical micrograph which shows the solidification structure | tissue which resolidified the ingot manufactured with the conventional ingot manufacturing apparatus. It is a copy of the optical micrograph which shows the solidification structure | tissue which recast and solidified the ingot manufactured with the ingot manufacturing apparatus of 2nd Example of this invention. It is explanatory drawing equivalent to the side sectional view which shows schematic structure of the other example of the melting furnace used with a continuous cast bar manufacturing apparatus or an ingot manufacturing apparatus.

Explanation of symbols

I Continuous casting rod manufacturing device S Metal slurry manufacturing device 11 Melting furnace 12 Melting furnace body 12a Discharge path
12A crucible (inner container)
13 Exhaust pipe 14 Heater 15 Lid 15a Insertion hole 16 Dross removal 17 Melting furnace temperature control mechanism 18 Thermocouple (temperature measuring instrument)
DESCRIPTION OF SYMBOLS 19 Current supply control part 21 Molten metal discharge | emission control mechanism 22 Heat resistance control rod 23 Control rod drive part 31 Holding furnace 32 Holding furnace main body 32a Inlet 32b Outlet 33 Heater 34 Lid body 37 Holding furnace temperature control mechanism 38 Thermocouple (temperature measurement) vessel)
39 Energization Control Unit 41 Cooling Body 51 Cooling Body Drive Mechanism 52 Rotating Shaft 53 Driving Unit 61 Cooling Body Cooling Mechanism 62 Piping 63 Refrigerant Storage Unit 64 Pump 71 Refrigerant Cooling Mechanism 81 Tundish 81a Discharge Port 91 Water Cooling Mold P Ingot Manufacturing Device 111 Melting Furnace 112 Melting furnace body 112A Crucible (inner vessel)
113 Discharge pipe 114 Heater 115 Lid 115a Insertion hole 116 Dross removal 117 Melting furnace temperature control mechanism 118 Thermocouple (temperature measuring device)
119 Energization control unit 121 Molten metal discharge control mechanism 122 Heat resistance control rod 123 Control rod drive unit 131 Mold 132 Mold body 133 Flange unit 141 Mold drive mechanism 142 Mold holding unit 143 Drive unit 144 Driven gear 145 Drive gear 146 Motor 151 Mold cooling Mechanism 152 Cooling tank 153 Refrigerant 161 Refrigerant cooling mechanism 162 Piping 163 Refrigerant cooling unit 164 Pump M Molten metal U Metal slurry B Continuous casting rod D Dummy bar N Ingot

Claims (11)

A melting furnace for producing magnesium alloy or aluminum alloy molten metal;
A discharge mechanism for discharging the supernatant of the molten metal from the melting furnace while leaving impurities of the molten metal in the melting furnace;
A molten metal discharge control mechanism for controlling the discharge amount of the molten metal supernatant discharged from the melting furnace via the discharge mechanism;
A holding furnace for cooling the supernatant of the molten metal discharged from the melting furnace via the discharge mechanism and holding it in a semi-molten state;
A cooling body having a temperature lower than the melting point of the molten metal, buried in the supernatant of the molten metal in the holding furnace;
A cooling body driving mechanism that rotates the cooling body in one direction to periodically stop or reverse the cooling body at a constant period;
A metal slurry manufacturing apparatus comprising: A melting furnace for producing magnesium alloy or aluminum alloy molten metal;
A discharge mechanism for discharging the supernatant of the molten metal from the melting furnace while leaving impurities of the molten metal in the melting furnace;
A molten metal discharge control mechanism for controlling the discharge amount of the molten metal supernatant discharged from the melting furnace via the discharge mechanism;
A cooling body having a temperature lower than the melting point of the molten metal, into which the supernatant of the molten metal discharged from the melting furnace through the discharge mechanism is poured;
A cooling body drive mechanism for rotating the cooling body in one direction, rotating the cooling body in one direction to stop periodically, or reversing the cooling body at a constant cycle;
A holding furnace that cools the molten metal supernatant from the cooling body and holds it in a semi-molten state;
A metal slurry manufacturing apparatus comprising: In the metal slurry manufacturing apparatus according to claim 1 or 2,
Provided with a cooling body cooling mechanism for circulating a coolant through the cooling body,
The metal slurry manufacturing apparatus characterized by the above-mentioned. In the metal slurry manufacturing apparatus according to claim 3,
Provided with a refrigerant cooling mechanism for cooling the refrigerant;
The metal slurry manufacturing apparatus characterized by the above-mentioned. A melting furnace for producing magnesium alloy or aluminum alloy molten metal;
A discharge mechanism for discharging the supernatant of the molten metal from the melting furnace while leaving impurities of the molten metal in the melting furnace;
A molten metal discharge control mechanism for controlling the discharge amount of the molten metal supernatant discharged from the melting furnace via the discharge mechanism;
A mold for casting the molten metal supernatant discharged from the melting furnace through the discharge mechanism ;
A mold driving mechanism for rotating the mold in one direction to periodically stop or reverse the mold at a constant period;
A mold cooling mechanism for cooling the mold;
An ingot manufacturing apparatus comprising: A melting furnace for producing magnesium alloy or aluminum alloy molten metal;
A discharge mechanism for discharging the supernatant of the molten metal from the melting furnace while leaving impurities of the molten metal in the melting furnace;
A molten metal discharge control mechanism for controlling the discharge amount of the molten metal supernatant discharged from the melting furnace via the discharge mechanism;
A cooling body into which the molten metal supernatant discharged from the melting furnace via the discharge mechanism is poured;
A cooling body drive mechanism for rotating the cooling body in one direction, rotating the cooling body in one direction to stop periodically, or reversing the cooling body at a constant cycle;
A mold for casting the molten metal supernatant from the cooling body;
A mold cooling mechanism for cooling the mold;
An ingot manufacturing apparatus comprising: In the ingot production apparatus according to claim 6 ,
The mold is provided with a mold driving mechanism for rotating the mold in one direction to periodically stop or reverse the mold at a constant period.
The ingot manufacturing apparatus characterized by the above-mentioned. In the ingot manufacturing apparatus according to claim 6 or 7 ,
Provided with a cooling body cooling mechanism for circulating a coolant through the cooling body,
The ingot manufacturing apparatus characterized by the above-mentioned. In the ingot production apparatus according to claim 8 ,
Provided with a refrigerant cooling mechanism for cooling the refrigerant;
The ingot manufacturing apparatus characterized by the above-mentioned. In the ingot manufacturing apparatus according to any one of claims 5 to 9 ,
The mold cooling mechanism is composed of a cooling tank and a refrigerant accommodated in the cooling tank.
The ingot manufacturing apparatus characterized by the above-mentioned. In the ingot production apparatus according to claim 10 ,
Provided with a refrigerant cooling mechanism for cooling the refrigerant of the mold cooling mechanism,
The ingot manufacturing apparatus characterized by the above-mentioned.