JP2020040077A - Device and method for producing aluminum continuously-cast material - Google Patents

Abstract

To provide a continuously-cast material production device capable of attaining cost reduction and quality increase.SOLUTION: A production device of an aluminum continuously-cast material comprises: a melting furnace 11 for melting a solid material of aluminum; a holding furnace 12 for holding melted molten metal W1; and a casting machine 2 for continuously casting the molten metal W1 fed from the holding furnace 12 to obtain a continuously-cast material W2. The device includes a reflux machine 3 for refluxing the surplus molten metal W1 not fed in casting in the casting machine 2 to the holding furnace 12 without solidifying the same.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method of an aluminum continuous cast material for manufacturing an aluminum continuous cast material that can be suitably used as, for example, an aluminum extruded material, a rolled material, a forged material, and the like.

  In the specification and the claims, the term aluminum (Al) is used to include an aluminum alloy (Al alloy).

  In recent years, the miniaturization and weight reduction of various products have been progressing, and the size of aluminum products provided as the basis of those products has also been miniaturized. Consolidation is also underway. Among them, forged materials with high reliability in quality are widely used for automotive parts and the like that require high performance, and are required to be miniaturized and at the same time, to be multiple in order to improve productivity. Is done.

  A forging material used for forging is generally manufactured by a continuous cast material obtained by continuous casting. For example, as shown in Patent Documents 1 and 2 below, a manufacturing apparatus (manufacturing equipment) for manufacturing a continuous cast material holds a melting furnace for melting a solid material made of aluminum and a molten metal (also referred to as hot metal). And a casting machine for continuously casting the molten metal. The molten metal is sent from the holding furnace to a casting machine through a molten metal flow path such as a gutter, where it is solidified through a mold to produce a continuous cast material. It is supposed to be.

  On the other hand, with the miniaturization and multiple connection of forging materials as described above, miniaturization and multiple connection of forged materials (cast materials) are also required. However, in general, when the casting material is reduced in size and the casting equipment is increased in number, the frequency of occurrence of turbulence and vortex of the molten metal in a molten metal flow path such as a gutter for flowing the molten metal increases, and the molten metal stays locally. This causes the material yield to decrease. Furthermore, miniaturization of the casting material generally reduces the amount of molten metal consumed per unit time, so that during continuous casting, the heat of the molten metal is radiated to the outside air, etc., so that the cooling of the molten metal is facilitated and the quality of the casting material deteriorates. May be

JP 2007-167863 A JP 2005-194625 A

  Under such circumstances, measures to reduce the size of the casting material include only the melting furnace, the holding furnace and other electrolytic furnaces (heating furnaces), and the molten metal flow path as they are. Countermeasures such as reducing the size of the device are conceivable. However, in this countermeasure, at the end of casting, the amount of molten metal remaining in the electrolytic furnace or the molten metal flow path increases, and the amount of molten metal to be discarded relatively increases. There is a problem that the cost increases when used.

  In order to improve the yield, there is also a countermeasure to reduce the flow rate by narrowing the flow path of the molten metal.However, although this reduces the amount of molten metal discarded, the cooling of the molten metal becomes easier and the molten metal temperature further decreases. And the quality of the cast material is degraded.

  Even if any of the above measures are adopted, there is a trade-off relationship between the lowering of the casting temperature and the increase in the amount of molten metal waste, and ultimately a compromise is to be found, so that a sufficiently satisfactory result is obtained. Difficult to obtain.

  On the other hand, a countermeasure of increasing the tapping temperature of the molten metal from an electrolytic furnace such as a melting furnace to maintain the molten metal temperature at a high temperature is also a candidate. However, in the countermeasure, the temperature of the molten metal is increased more than necessary, and the excessive temperature rise causes deactivation of the refined material, an increase in the amount of hydrogen gas in the molten metal, and lowers the quality of the cast material. There was a problem that there was a risk.

  The present invention has been made in view of the above-described problems, and has an apparatus and a method for manufacturing an aluminum continuous cast material capable of manufacturing a high quality aluminum continuous cast material while improving the material yield and reducing the cost. The aim is to provide a method.

  In order to solve the above problems, the present invention includes the following means.

[1] An aluminum continuous comprising a melting furnace for melting a solid material of aluminum, a holding furnace for holding the melt, and a casting machine for continuously casting the melt supplied from the holding furnace to obtain a continuous cast material. An apparatus for manufacturing a casting material,
An aluminum continuous cast material, comprising: a recirculator that recirculates excess molten metal not subjected to casting in the casting machine to any one of the melting furnace and the holding furnace without solidifying. manufacturing device.

  [2] The apparatus for producing an aluminum continuous cast material according to the above [1], wherein the molten metal is refluxed to the holding furnace by the reflux machine.

  [3] The apparatus for producing an aluminum continuous cast material according to the above item 1, wherein the melting furnace and the holding furnace are constituted by a melting and holding furnace that also serves as both furnaces.

  [4] The reflux machine is provided with a reflux path provided between the casting machine and one of the heating furnaces, and a flow path for moving the molten metal toward the one heating furnace side along the reflux path. The apparatus for producing an aluminum continuous cast material according to any one of the above items 1 to 3, comprising a reflux pump.

  [5] The apparatus for manufacturing an aluminum continuous cast material according to the above item 4, wherein the reflux pump is constituted by an electromagnetic pump.

  [6] The apparatus for producing an aluminum continuous cast material according to any one of the above items 1 to 5, wherein a heater for heating the molten metal is provided in the reflux machine.

[7] including first and second manufacturing facilities,
The first and second manufacturing facilities include a melting furnace for melting a solid material of aluminum, a holding furnace for holding the melt, and a casting for continuously casting the melt supplied from the holding furnace to obtain a continuous cast material. Machine and each,
Fluid transfer in which excess molten metal that has not been subjected to casting in the casting machine of the first manufacturing facility is flown and transferred to one of the melting furnace and the holding furnace of the second manufacturing facility without solidification. An apparatus for producing an aluminum continuous cast material, comprising a machine.

[8] Aluminum continuous casting including a melting step of melting a solid aluminum material, a holding step of holding the melt, and a casting step of continuously casting the melt supplied from the holding step to obtain a continuous casting material. A method of manufacturing a material,
The method includes a reflux step of refluxing excess molten metal that has not been subjected to casting in the casting step to the molten metal in one of the melting step and the holding step while flowing the excess molten metal at a solid phase ratio of less than 100%. A method for producing an aluminum continuous cast material, comprising:

  [9] The method for producing an aluminum continuous cast material according to the above item 8, wherein the solid phase ratio of the molten metal in the reflux step is adjusted to 50% or less.

  [10] The method for producing an aluminum continuous cast material according to the above item 8 or 9, wherein the molten metal is continuously refluxed in the refluxing step from the start to the end of the casting in the casting step.

  [11] The method for producing an aluminum continuous cast material according to any one of the above items 8 to 10, wherein the molten metal is heated in the refluxing step.

  [12] In the casting step, during the period from the start to the end of casting, the amount of molten metal per unit time provided for casting in the casting step is larger than the amount of molten metal per unit time refluxed in the refluxing step. 12. The method for producing an aluminum continuous cast material according to any one of the above items 8 to 11, wherein the method comprises:

[13] including first and second manufacturing steps,
The first and second manufacturing steps include a melting step of melting a solid material of aluminum, a holding step of holding the melt, and a continuous casting of the melt supplied from the holding step to obtain a continuous cast material. And each process,
Excess molten metal that has not been subjected to casting in the casting step of the first manufacturing step is caused to flow in a state where the solid phase ratio is less than 100%, while the excess molten metal is in one of the melting step and the holding step in the second manufacturing step. A method for producing an aluminum continuous cast material, comprising a flow transfer step of mixing into a molten metal.

  According to the apparatus for manufacturing an aluminum casting material of the invention [1], since the excess molten metal that has not been cast by the casting machine is returned to the holding furnace or the like by the reflux machine, the amount of waste of the molten metal as the metal material can be reduced. As a result, the material yield can be improved and the cost can be reduced. Furthermore, since the flow rate of the molten metal flowing in the molten metal flow path can be increased by the amount of the reflux of the molten metal, a decrease in the temperature of the flowing molten metal can be prevented, and a high-quality aluminum continuous cast material can be manufactured.

  According to the apparatus for manufacturing an aluminum casting of the invention [2], since the excess molten metal is returned to the holding furnace, the components of the refluxed molten metal and the molten metal stored in the holding furnace in advance can be substantially equalized. Variation of the molten metal component can be prevented, and the quality of the aluminum cast material can be further improved.

  According to the apparatus for manufacturing an aluminum casting of the invention [3], the above effects can be obtained more reliably.

  According to the apparatus for manufacturing an aluminum casting of the invention [4], the excess molten metal can be efficiently and smoothly refluxed.

  According to the apparatus for manufacturing an aluminum casting of the invention [5], it is possible to adjust the reflux amount of the excess molten metal by adjusting the output of the electromagnetic pump, and thus to appropriately control the circulation amount of the molten metal in the entire apparatus. Thus, an aluminum continuous cast material can be efficiently manufactured in a more stable state.

  According to the apparatus for manufacturing an aluminum casting of the invention [6], it is possible to more reliably prevent the adverse effect caused by the decrease in the temperature of the molten metal.

  According to the apparatus for manufacturing an aluminum casting of the invention [7], similarly to the above, it is possible to manufacture a high-quality aluminum continuous casting while improving the material yield and reducing the cost.

  According to the method of manufacturing an aluminum cast material of the invention [8], since the manufacturing process of the above-described apparatus invention is specified, similarly to the above, high quality while reducing the amount of molten metal waste and the cost can be reduced. An aluminum continuous cast material can be manufactured.

  According to the method for producing an aluminum casting of the invention [9], sufficient fluidity can be given to the excess molten metal, and the excess molten metal can be more reliably refluxed.

  According to the method for manufacturing an aluminum cast material of the invention [10], the above effects can be more reliably obtained.

  According to the method for manufacturing an aluminum casting of the invention [11], it is possible to more reliably prevent an adverse effect due to a decrease in the temperature of the molten metal.

  According to the method for producing an aluminum casting of the invention [12], high production efficiency can be maintained.

  According to the method for manufacturing an aluminum cast material of the invention [13], similarly to the above, it is possible to improve the material yield and reduce the cost, and to manufacture a high-quality aluminum continuous cast material.

FIG. 1 is a perspective view schematically illustrating an apparatus for manufacturing a continuous cast aluminum material according to a first embodiment of the present invention. FIG. 2 is a side view schematically illustrating the apparatus for manufacturing an aluminum continuous cast material according to the first embodiment. FIG. 3 is a perspective view schematically showing an apparatus for manufacturing an aluminum continuous cast material according to a second embodiment of the present invention. FIG. 4 is a side view schematically illustrating an apparatus for manufacturing an aluminum continuous cast material according to the second embodiment. FIG. 5 is a perspective view schematically showing an apparatus for manufacturing an aluminum continuous cast material according to a third embodiment of the present invention. FIG. 6 is a perspective view schematically showing an apparatus for manufacturing an aluminum continuous cast material according to a fourth embodiment of the present invention.

<First embodiment>
FIG. 1 is a schematic perspective view showing an apparatus for producing an aluminum continuous cast material according to a first embodiment of the present invention, and FIG. 2 is a schematic side view showing the apparatus.

  As shown in both figures, the manufacturing apparatus of the present embodiment includes a melting furnace 11, a holding furnace 12, a casting machine 2, and a reflux machine 3 as basic components.

  The melting furnace 11 is configured by a heating furnace such as an electrolytic furnace, and is used for charging an aluminum solid material before melting and melting to produce a molten metal W1, and to adjust components of the molten metal W1.

  The holding furnace 12 is constituted by a heating furnace such as an electrolytic furnace, for transferring the molten metal W1 melted in the melting furnace 11, keeping the molten metal W1 in a stable state, and performing cleaning and component adjustment. It is. Further, the holding furnace 12 may be charged with a solid material at the time of component adjustment as needed, and may be melted. However, the holding furnace 12 is mainly intended to maintain the molten metal W1 in a stable state. The output of the holding furnace 12 is generally not as high as that of the electrolytic furnace 11.

  In the present embodiment, the case where the melting furnace 11 and the holding furnace 12 are separately used is described as an example. However, in the present invention, as described in a second embodiment and the like described later, A single melting and holding furnace having both functions of the melting furnace 11 and the holding furnace 12 and configured by a heating furnace such as an electrolytic furnace may be used.

  In the manufacturing apparatus of the present embodiment, an inter-furnace flow path 15 constituted by a gutter or the like is provided between the melting furnace 11 and the holding furnace 12, and the molten metal W1 melted by the melting furnace 11 is provided between the melting furnace 11 and the holding furnace 12. Is caused to flow down by its own weight and supplied into the holding furnace 12.

  Between the holding furnace 12 and the casting machine 2, an outward casting path 25 constituted by a gutter or the like is provided, and the molten metal W1 held in the holding furnace 12 flows down the casting outward path 25 by its own weight to the casting machine 2. It is configured to be supplied.

  The casting machine 2 is configured by a vertical continuous casting device in which the casting direction is set vertically downward, and the supplied molten metal W1 is passed through a mold to solidify, thereby forming a rod-shaped continuous casting material ( (Ingot) W2 is semi-continuously and sequentially manufactured.

  Further, in the present embodiment, the reflux machine 3 has a function of returning the surplus molten metal W1 not cast to the casting machine 2 to the holding furnace 12.

  That is, at the downstream end of the casting outward path 25, there is provided a molten metal discharge part 30 for discharging the excess molten metal W1 not subjected to casting to the outside (downstream side) of the casting machine 2, and the molten metal discharge part 31 is provided. Is connected to the suction port of the electromagnetic pump 36. Further, between the discharge port of the electromagnetic pump 36 and the holding furnace 12, a return path 35 constituted by a gutter, piping, and the like is provided.

  When the electromagnetic pump 36 is driven, the excess molten metal W1 is sucked from the molten metal discharge section 30 through the suction port of the electromagnetic pump 36, and is discharged from the discharge port of the electromagnetic pump 36 to the upstream end of the return path 35. The molten metal W1 discharged to the upstream end of the return path 35 flows down the return path 35 by its own weight and is returned to the holding furnace 12.

  Here, in the present embodiment, the reflux machine 3 is constituted by the molten metal discharge section 30, the reflux path 35, and the electromagnetic pump 36. Further, a reflux pump is constituted by the electromagnetic pump 36.

  In the present embodiment, the step of melting the solid material by the melting furnace 11 is referred to as a melting step, the step of holding the molten metal W1 by the holding furnace 12 is referred to as a holding step, and the molten metal W1 supplied from the casting outward path 16 is cast. The step of casting by the machine 2 is referred to as a casting step, and the step of returning the excess molten metal W1 not subjected to casting by the reflux machine 3 to the holding furnace 12 is referred to as a reflux step.

  In the manufacturing apparatus of the present embodiment, the molten metal W1 melted in the melting furnace 11 is supplied to the holding furnace 12 through the inter-furnace flow path 15, and the molten metal W1 from the holding furnace 12 passes through the casting outward path 25 and is cast into the casting machine. 2 is supplied. The molten metal W1 supplied to the casting machine 2 is solidified through a mold to produce a continuous cast material W2. On the other hand, in the casting machine 2, the surplus molten metal W <b> 1 not used for casting is pumped up by the electromagnetic pump 36 and returned to the holding furnace 12 through the return path 35.

  According to the apparatus for manufacturing an aluminum continuous cast material of the present embodiment having the above-described configuration, the excess molten metal W1 that has not been cast by the casting machine 2 is refluxed to the holding furnace 12 by the reflux machine 3, so that the molten metal W1 Circulates between the holding furnace 12 and the casting machine 2. For this reason, the flow rate of the molten metal W1 flowing in the molten metal flow path such as the casting outward path 25 is increased by the amount of the reflux of the molten metal W1, making it difficult to cool the molten metal W1 and effectively preventing a decrease in the temperature of the flowing molten metal W1. . For example, the temperature difference between the molten metal W1 in the upstream mold and the molten metal W1 in the downstream mold in the casting machine 2 can be reduced, and the quality variation of the continuous cast material W1 as a product due to the molten metal temperature difference can be reduced. Therefore, the high-quality continuous cast material W2 can be manufactured in a stable state throughout.

  For reference, in the conventional manufacturing apparatus in which the molten metal is not circulated, the distance between the molten metal of the most upstream mold to be poured first in the casting machine 2 and the molten metal of the most downstream mold to be poured last is 50 mm. While a temperature difference of about ° C. may occur, in the manufacturing apparatus of the present embodiment, the temperature difference can be reduced.

  Also, by returning the excess molten metal W1 to the retainer 12, the molten metal W1 as a metal material can be effectively used, so that the material yield can be improved and the cost can be reduced.

  Further, in the present embodiment, after the predetermined casting process is completed, the molten metal W1 can be circulated between the holding furnace 12, the casting outward path 25, and the recirculator 3 until the next casting process is started. . Thereby, each of the molten metal flow paths 25 and 35 can be maintained at an appropriate high temperature, the preheating application operation before the start of casting can be omitted, and the temperature can be immediately raised to the target temperature at the start of casting. Therefore, the casting can be started in a short time from the casting stopped state, the production efficiency can be improved, and the quality reduction of the ingot structure due to the lowering of the molten metal temperature can be surely suppressed. An aluminum continuous cast material W2 can be manufactured. Furthermore, before starting casting, there is no need to apply a preheat to the molten metal flow path and the like or to dispose of the molten metal for cleaning, and from this point, it is possible to effectively use the material, thereby improving the yield and reducing the cost. Can be achieved.

  Further, in the present embodiment, the molten metal W1 can be circulated even after the forging process is completed. Therefore, even if only the casting system equipment such as a mold is set small in order to reduce the size of the cast material W2, the molten metal W1 can be circulated. There is no remaining in the flow paths 25 and 35, so that the amount of the molten metal W1 to be discarded can be remarkably reduced, and the cost required for reusing the waste material can be reduced. In other words, it is possible to surely reduce the size and the quality of the cast material W2 while reducing the cost.

  Further, in the manufacturing apparatus of the present embodiment, since the excess molten metal W1 is caused to flow and returned to the holding furnace 12, the excess material (the molten metal W1) can be automatically collected and reused, and the working efficiency can be improved. The yield can be improved without lowering, and the cost can be further reduced.

  Here, in the present embodiment, in order to recirculate the excess molten metal W1 to the holding furnace 12 by flowing, it is necessary to adjust the solid phase ratio of the excessive molten metal W1 to less than 100%. In particular, by adjusting the solid phase ratio of the melt W1 to 50% or less, sufficient fluidity can be imparted to the surplus melt W1, and the melt W1 can be more smoothly refluxed. Therefore, it is possible to reliably prevent a problem that the excess molten metal W1 is solidified and clogs or blocks the return passage 35 or the piping system of the electromagnetic pump 36.

  In this embodiment, even if the molten metal W1 is partially solidified or partially lower than the liquidus line, it can be returned to the holding furnace 12 as long as the molten metal W1 has fluidity. It is.

  Further, in the present embodiment, a heater for heating the surplus molten metal W1 may be arranged in the reflux machine 3 such as the reflux path 35. In this case, since the temperature of the molten metal W1 can be more reliably prevented from lowering by heating the refluxed molten metal W1, careless solidification of the molten metal W1 can be more reliably prevented, and clogging of the flow path and the piping system can be prevented. And blockage can be more reliably prevented. Further, since the excess molten metal W1 can be charged into the holding furnace 12 while maintaining the predetermined temperature, the temperature difference between the molten metal W1 previously stored in the holding furnace 12 and the molten metal W1 to be recirculated is maintained. Can be reduced, and the temperature of the molten metal in the holding furnace 12 can be maintained at an appropriate temperature. For this reason, the molten metal W1 in a stable state can always be supplied to the casting machine 2, and a higher quality continuous cast material W2 can be manufactured.

  Further, in the present embodiment, since the excess molten metal W1 discharged from the casting machine 3 is returned to the holding furnace 12, the components of the returned molten metal W1 and the molten metal W1 are stored in the holding furnace 12 in advance. The components of the melt W1 are almost equal. Therefore, it is possible to reliably prevent a problem that the component of the molten metal W1 in the holding furnace 12 changes due to the reflux of the molten metal W1, and to supply the molten metal W1 having a stable component to the casting machine 2. High quality continuous cast material W2 can be manufactured.

  Further, in the present embodiment, since the molten metal W1 is circulated to prevent the temperature of the molten metal from lowering, it is not necessary to excessively raise the temperature of the molten metal W1 discharged from the melting furnace 11, and the loss of the fine material is lost. It is possible to prevent the occurrence of an increase in the activity and molten hydrogen gas amount, and it is possible to further improve the quality of the continuous casting material W2.

  Further, in the present embodiment, since the excess molten metal W1 discharged from the forging machine 2 is pumped up by the electromagnetic pump 36 and returned, the flow rate of the excessive molten metal W1 (reflux amount) is adjusted by adjusting the output of the electromagnetic pump 36. ) Can be adjusted, and the circulation amount of the molten metal W1 in the entire apparatus can be appropriately controlled, and the continuous cast material W2 can be efficiently manufactured in a stable and stable state.

  Further, in the present embodiment, it is preferable that the molten metal W1 supplied for casting in the casting machine 2 has a larger capacity per unit time (flow rate) than the excess molten metal W1 refluxed without being supplied for casting. That is, when the excess molten metal W1 to be refluxed is too large, the casting amount is reduced, and there is a possibility that the production efficiency is reduced. Therefore, as described above, by increasing the amount of the molten metal W1 to be subjected to forging, it is possible to reliably improve production efficiency while preventing quality deterioration due to a temperature decrease or the like.

  In the present embodiment, the surplus molten metal W1 discharged from the casting machine 3 is returned to the holding furnace 12, but is not limited thereto. In the present invention, the surplus molten metal W1 is returned to the melting furnace 11. You may make it do. Further, the surplus molten metal W1 may be branched and returned to both the melting furnace 11 and the holding furnace 12.

<Second embodiment>
FIGS. 3 and 4 are schematic views showing an apparatus for producing a continuous cast aluminum material according to a second embodiment of the present invention. As shown in both figures, the manufacturing apparatus of the second embodiment includes a melting and holding furnace 1, a casting machine 2, and a reflux machine 3 as basic components.

  As described above, the electrolytic holding furnace 1 has both functions of the melting furnace 11 and the holding furnace 12.

  The reflux machine 3 includes first and second two buffer tanks (temporary storage tanks) 31 and 32 for temporarily storing the surplus molten metal W1, a recirculation path 35 including a gutter, and the like. It has.

  The reflux path 35 has one end (downstream end) connected to the melting and holding furnace 1, and the other end (upstream end) disposed above the molten metal discharge section 30 of the casting machine 2. Have been.

  The first and second buffer tanks 31 and 32 have a molten metal recovery position (a position where the first buffer tank 31 is arranged in FIG. 3) corresponding to the molten metal discharge portion 30 and a molten metal pouring position corresponding to the return path 35 ( 4 is configured to be movable between a position where the first buffer tank 31 is disposed (a position where the first buffer tank 31 is disposed) and a retracted position below the molten metal discharge unit 30 (a position where the second buffer 32 is disposed in FIG. 3). In addition, at the molten metal pouring position, it is configured to be tiltable toward the reflux path 35 side.

  When the buffer tanks 31 and 32 are disposed at the molten metal recovery position, the buffer tanks 31 and 32 are configured to be able to collect the surplus molten metal W1 discharged from the molten metal discharge unit 30 and are disposed at the molten metal discharge position. In this configuration, the molten metal W1 collected inside can be poured into the recirculation path 35 by tilting. Further, the buffer tanks 31 and 32 are arranged so that, when one of the buffer tanks is located at the retreat position, the other one of the buffer tanks does not affect the molten metal recovery operation or the pouring operation.

  In the manufacturing apparatus according to the second embodiment, the other configuration is substantially the same as that of the manufacturing apparatus according to the first embodiment.

  In the manufacturing apparatus according to the second embodiment, for example, as shown in FIG. 3, casting is started in a state where the first buffer tank 31 is disposed at the molten metal recovery position and the second buffer tank 32 is disposed at the retracted position. The molten metal W1 discharged from the melting and holding furnace 1 flows down the casting outward path 25 by its own weight and is transferred to the casting machine 2, and the molten metal W1 solidifies through the mold of the casting machine 2 and is solidified by a predetermined length. The rod-shaped continuous cast material (ingot) W2 is sequentially manufactured.

  In addition, of the molten metal W1 supplied to the casting machine 2, the excess molten metal W1 that has not been subjected to casting is discharged from the molten metal discharge unit 30 and collected in the first buffer tank 31. While the casting process by the casting machine 2 is continuously performed in this manner, when the molten metal W1 in the first buffer tank 31 is full, the first buffer tank 31 is raised and arranged at the molten metal discharging position as shown in FIG. At the same time, the second buffer tank 32 rises and is arranged at the molten metal recovery position. Then, the surplus molten metal W1 discharged from the molten metal discharge unit 30 is continuously collected by the second buffer tank 32. In the present embodiment, during switching from the recovery of the molten metal W1 by the first buffer tank 31 to the recovery of the molten metal W1 by the second buffer tank 32, in order to prevent the molten metal W1 from leaking, the molten metal from the molten metal discharge unit 30 is prevented. Means for temporarily stopping the discharge of W1 may be provided.

  Further, the first buffer tank 31 arranged at the molten metal pouring position is tilted to discharge the internal molten metal W1 into the recirculation path 35. The surplus molten metal W1 discharged into the reflux passage 35 flows through the reflux passage 35 by its own weight and is returned to the melting and holding furnace 1. Further, after all the molten metal W1 in the first buffer tank 31 is poured into the recirculation path 35, as shown by the imaginary line (two-dot chain line) in FIG. While returning to the state, it moves to the retreat position while avoiding interference with the second buffer tank 32.

  By continuously and repeatedly performing the above operations, the production of the continuous cast bar W2 is continuously performed.

  In the manufacturing apparatus according to the second embodiment, too, as in the first embodiment, the excess molten metal W1 that has not been cast is returned to the melting and holding furnace 1 so that the molten metal W1 is circulated. The same operation and effect as those of the first embodiment can be obtained.

  In the second embodiment, by providing the buffer tanks 31 and 32 with a heater for heating the molten metal W1, it is possible to reliably prevent a problem due to a decrease in the temperature of the recirculated molten metal W1.

<Third embodiment>
FIG. 5 is a perspective view schematically showing an apparatus for manufacturing an aluminum continuous cast material according to a third embodiment of the present invention. As shown in the figure, in this manufacturing apparatus, first and second manufacturing facilities for performing first and second manufacturing steps are arranged in series. That is, the first manufacturing facility supplies the molten metal W1 from the first melting and holding furnace 1a to the first melting machine 1a for performing the melting step and the holding step, the first casting machine 2a for performing the casting step, and the first casting machine 2a. And a first casting outward path 25a. Further, the second manufacturing facility supplies the molten metal W1 to the second casting machine 2b from the second melting and holding furnace 1b for performing the melting step and the holding step, the second casting machine 2b for performing the casting step, and the second melting and holding furnace 1b. And a second casting outward path 25b.

  Further, the manufacturing apparatus of the present embodiment is provided with the coupling machine 4 for transferring the surplus molten metal W1 not used for casting in the first casting machine 2a to the second melting and holding furnace 1b.

  The connecting machine 4 includes a molten metal discharge section 30a for discharging the molten metal W1 not cast in the first casting machine 2a, and a connecting flow path 45 for connecting the second molten holding furnace 1b. The surplus molten metal W1 discharged is configured to flow down the connection flow path 45 by its own weight and to be supplied into the second melting and holding furnace 1b.

  In the present embodiment, the step of transferring the surplus molten metal W1 from the first casting machine 2a to the second melting and holding furnace 1b by the connecting machine 4 is referred to as a fluid transfer step.

  Further, in the present embodiment, the surplus molten metal W1 is not discharged from the second casting machine 2b. However, as described in detail later, a molten metal discharging portion is formed in the second casting machine 2b, and the molten metal discharging portion is formed from the molten metal discharging portion. The surplus molten metal W1 may be discharged and returned to the upstream melting and holding furnace 1a, or may be supplied to the next melting and holding furnace disposed downstream.

  Other configurations of the manufacturing apparatus of the third embodiment are substantially the same as those of the manufacturing apparatuses of the first and second embodiments. Omitted.

  In the manufacturing apparatus of the third embodiment, a molten metal W1 is supplied from a first melting and holding furnace 1a to a first casting machine 2a through a first casting forward path 25a, where it is cast to produce a continuous cast material W2. On the other hand, the surplus molten metal W1 that has not been cast in the first casting machine 2a is discharged from the molten metal discharge section 30a and supplied to the second melting and holding furnace 1b through the connection flow path 45. The molten metal W1 supplied to the second melting and holding furnace 1b is mixed with the molten metal W1 stored in the second melting and holding furnace 1b in advance, and the molten metal W1 in the second melting and holding furnace 1b is removed from the second melting and holding furnace 1b. To the second casting machine 2b. The molten metal W1 supplied to the second casting machine 2b is cast there to produce a continuous cast material W2.

  In addition, when there is no height difference between the molten metal discharge part 30a of the first casting machine 2a and the second molten holding furnace 1b, and it is difficult to flow the molten metal W1 by its own weight along the connection flow path 45, the above-described embodiment is used. As described above, the connecting machine 4 may be provided with a forced circulation means such as a pump to feed the molten metal W1 from the molten metal discharge portion 30a to the second melting and holding furnace 1b.

  As described above, according to the manufacturing apparatus of the third embodiment, the excess molten metal W1 that has not been subjected to casting by the first casting machine 2a is supplied to the second melting and holding furnace 1b by the coupling machine 4. Therefore, the flow rate of the molten metal W1 flowing in the molten metal flow path such as the first casting forward path 25a increases by an amount corresponding to the supply of the excessive molten metal to the second melting and holding furnace 1b, so that the molten metal W1 is difficult to cool and the temperature of the molten metal W1 decreases. Can be prevented. Therefore, similarly to the above, a high quality continuous cast material W2 can be efficiently manufactured.

  Further, in the third embodiment, if the temperature riser is provided in the coupling machine 4, the temperature of the excess molten metal W1 discharged from the first casting machine 2a is increased and supplied to the second melting and holding furnace 1b. In addition, fluctuations in the melting temperature in the second melting and holding furnace 1b can be prevented, and the continuous cast material W2 can be manufactured in a more stable state.

  In the third embodiment, the case where the first and second manufacturing facilities are arranged in series has been described as an example. However, the present invention is not limited to this case. In the present invention, three or more manufacturing facilities are used. They may be arranged in series. Further, in the present invention, after arranging two or more production facilities in series, a molten metal discharge section is provided in a casting machine of a final (downstream end) production facility, and excess molten metal discharged from the melt discharge section is provided. May be returned to the melting furnace, the holding furnace, or the melting and holding furnace in any of the upstream manufacturing facilities by using the reflux machine 3 of the first and second embodiments.

<Fourth embodiment>
FIG. 6 is a perspective view schematically showing an apparatus for manufacturing an aluminum continuous cast material according to a fourth embodiment of the present invention. As shown in the drawing, in the manufacturing apparatus according to the fourth embodiment, a horizontal (horizontal) continuous casting machine in which the casting direction is set in a horizontal direction (horizontal direction) is used as the casting machine 2.

  The other configuration of the manufacturing apparatus according to the fourth embodiment is substantially the same as that of the first embodiment, and therefore, the same portions are denoted by the same reference numerals and the description thereof will not be repeated.

  In the manufacturing apparatus of the present embodiment, the molten metal W1 of the melting and holding furnace 1 is supplied to the casting machine 2 through the outward casting path 25, where the molten metal W1 is solidified through the casting mold, thereby forming a rod-shaped continuous cast material (ingot). ) W2 is supplied continuously in the horizontal direction. Further, the excess molten metal W1 that has not been cast by the casting machine 2 is sucked from the molten metal discharge part 30 through the suction port of the electromagnetic pump 36, and is discharged from the discharge port of the electromagnetic pump 36 into the return path 35. The molten metal W1 discharged from the reflux passage 35 flows down the reflux passage 35 and is returned into the melting and holding furnace 1.

  In the manufacturing apparatus according to the fourth embodiment, as in the first and second embodiments, the excess molten metal W1 not subjected to casting is returned to the melting and holding furnace 1 so that the molten metal W1 is circulated. Therefore, the same operation and effect as those of the first and second embodiments can be obtained.

  In the fourth embodiment, by providing a heater for heating the molten metal W1 in the reflux path 35 of the refluxing machine 3, it is possible to reliably prevent a problem caused by a decrease in the temperature of the molten metal W1 to be refluxed. .

  INDUSTRIAL APPLICABILITY The apparatus for manufacturing an aluminum continuous cast material of the present invention can be suitably used, for example, when manufacturing an aluminum continuous cast material used as a material for an extruded aluminum material, a rolled material, a forged material or the like.

1, 1a, 1b: melting holding furnace 11: melting furnace 12: holding furnace 2, 2a, 2b: casting machine 3: recirculating machine 35: recirculating path 36: electromagnetic pump (recirculating pump)
4: Coupling machine (flow transfer machine)
W1: molten metal W2: continuous cast material

Claims (13)

A melting furnace for melting a solid material of aluminum, a holding furnace for holding the melt, and a casting machine for continuously casting the molten metal supplied from the holding furnace to obtain a continuous cast material. A manufacturing device,
An aluminum continuous cast material, comprising: a recirculator that recirculates excess molten metal not subjected to casting in the casting machine to any one of the melting furnace and the holding furnace without solidifying. manufacturing device.   The apparatus for producing an aluminum continuous cast material according to claim 1, wherein the molten metal is returned to the holding furnace by the reflux machine.   2. The apparatus for manufacturing an aluminum continuous cast material according to claim 1, wherein the melting furnace and the holding furnace are configured by a melting and holding furnace that also serves as both furnaces. 3.   A reflux path provided between the casting machine and the one of the heating furnaces; and a reflux pump for flowing the molten metal along the reflux path toward the one heating furnace. The apparatus for producing an aluminum continuous cast material according to any one of claims 1 to 3, further comprising:   The apparatus for manufacturing an aluminum continuous cast material according to claim 4, wherein the reflux pump is configured by an electromagnetic pump.   The apparatus for manufacturing an aluminum continuous cast material according to any one of claims 1 to 5, wherein the reflux machine is provided with a heater for heating the molten metal. Comprising first and second manufacturing facilities,
The first and second manufacturing facilities include a melting furnace for melting a solid material of aluminum, a holding furnace for holding the melt, and a casting for continuously casting the melt supplied from the holding furnace to obtain a continuous cast material. Machine and each,
Fluid transfer in which excess molten metal that has not been subjected to casting in the casting machine of the first manufacturing facility is flown and transferred to one of the melting furnace and the holding furnace of the second manufacturing facility without solidification. An apparatus for producing an aluminum continuous cast material, comprising a machine. Production of an aluminum continuous cast material including a melting step of melting a solid material of aluminum, a holding step of holding the melt, and a casting step of continuously casting the molten metal supplied from the holding step to obtain a continuous cast material The method
The method includes a reflux step of refluxing excess molten metal that has not been subjected to casting in the casting step to the molten metal in one of the melting step and the holding step while flowing the excess molten metal at a solid phase ratio of less than 100%. A method for producing an aluminum continuous cast material, comprising:   The method for producing an aluminum continuous cast material according to claim 8, wherein the solid phase ratio of the molten metal in the refluxing step is adjusted to 50% or less.   The method of manufacturing an aluminum continuous cast material according to claim 8, wherein the molten metal is continuously refluxed in the refluxing step from the start of casting to the end of casting in the casting step.   The method for producing an aluminum continuous cast material according to any one of claims 8 to 10, wherein the molten metal is heated in the refluxing step.   In the casting step, from the start to the end of casting, the amount of molten metal per unit time provided for casting in the casting step is set to be larger than the amount of molten metal per short time refluxed in the refluxing step. A method for producing an aluminum continuous cast material according to any one of claims 8 to 11. Including first and second manufacturing steps,
The first and second manufacturing steps include a melting step of melting a solid material of aluminum, a holding step of holding the melt, and a continuous casting of the melt supplied from the holding step to obtain a continuous cast material. And each process,
Excess molten metal that has not been subjected to casting in the casting step of the first manufacturing step is caused to flow in a state where the solid phase ratio is less than 100%, while the excess molten metal is in one of the melting step and the holding step in the second manufacturing step. A method for producing an aluminum continuous cast material, comprising a flow transfer step of mixing into a molten metal.

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