JP7198613B2 - Manufacturing equipment and manufacturing method for aluminum continuous casting material - Google Patents

Description

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

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

In recent years, the miniaturization and weight reduction of various products have progressed, and the aluminum supply materials that are the basis of these products have also been miniaturized. Consolidation is also underway. Among them, forged materials, which are highly reliable in terms of quality, are often used in automobile parts that require high performance. be done.

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

On the other hand, along with the miniaturization and multi-linkage of the forged material as described above, the forging material (casting material) is also required to be downsized and multi-connection. However, in general, miniaturization of casting materials and increasing the number of casting equipment increase the frequency of molten metal turbulence and eddies in molten metal flow paths such as troughs, resulting in local accumulation of molten metal. This is one of the causes, and the material yield is lowered. Furthermore, miniaturization of casting materials generally reduces the amount of molten metal consumed per unit time, so during continuous casting, the heat of the molten metal is radiated to the outside air, etc., making it easier to cool the molten metal, resulting in a deterioration in the quality of the casting. There is a risk.

JP 2007-167863 A JP 2005-194625 A

Under these circumstances, as a countermeasure for miniaturization of casting materials, only casting equipment such as molds can be used while leaving the melting furnace, holding furnace and other electrolytic furnaces (heating furnaces) and molten metal flow paths as they are. One possible countermeasure is to downsize the . However, in this countermeasure, a large amount of molten metal remains in the electrolytic furnace and the molten metal flow path at the end of casting, and the amount of molten metal to be discarded relatively increases. A problem arises in that the cost increases when using it.

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. This causes a problem of deteriorating the quality of the cast material.

In addition, regardless of which of the above countermeasures is adopted, there is a trade-off relationship between the decrease in casting temperature and the increase in the amount of waste molten metal. difficult to obtain.

On the other hand, another possible countermeasure is to increase the tapping temperature of molten metal discharged from an electrolytic furnace such as a melting furnace to maintain the molten metal temperature at a high temperature. However, such a countermeasure would raise the temperature of the molten metal more than necessary, and due to the excessive temperature rise, the deactivation of the fine grains and the increase in the amount of hydrogen gas in the molten metal would occur, and the quality of the cast material would deteriorate. There was a problem that it was possible.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is an apparatus and manufacturing method for continuously casting aluminum that is capable of manufacturing high-quality continuously cast aluminum while improving material yield and reducing costs. The purpose is to provide a method.

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

[1] An aluminum continuum comprising a melting furnace for melting a solid material of aluminum, a holding furnace for holding the molten aluminum, and a casting machine for continuously casting the molten metal supplied from the holding furnace to obtain a continuous cast material. A casting material manufacturing apparatus,
An aluminum continuous casting material characterized by comprising a recirculation machine that circulates surplus molten metal that has not been used for casting in the casting machine to a heating furnace of either the melting furnace or the holding furnace without solidifying it. Manufacturing equipment.

[2] The apparatus for manufacturing an aluminum continuous cast material according to the above item 1, wherein the molten metal is recirculated to the holding furnace by the recirculator.

[3] The apparatus for manufacturing a continuously cast aluminum material according to the above item 1, wherein the melting furnace and the holding furnace are configured by a melting and holding furnace that serves as both furnaces.

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

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

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

[7] 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 melted molten metal, and continuous casting of the molten metal supplied from the holding furnace to obtain a continuously cast material. each equipped with a machine and
Fluid transfer in which excess molten metal not used for casting in the casting machine of the first production facility is flowed and transferred to either one of the melting furnace and the holding furnace of the second production facility without being solidified. A manufacturing apparatus for continuously cast aluminum, characterized by comprising a machine.

[8] Aluminum continuous casting including a melting step of melting a solid material of aluminum, a holding step of holding the melted molten metal, and a casting step of continuously casting the molten metal supplied from the holding step to obtain a continuous cast material A method for manufacturing a material,
including a reflux step of refluxing surplus molten metal not used for casting in the casting step to the molten metal in either one of the dissolving step and the holding step while flowing in a state of a solid fraction of less than 100%. A method for producing an aluminum continuous casting material, characterized by:

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

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

[12] During the period from the start of casting to the end of casting in the casting process, the amount of molten metal supplied to casting in the casting process per unit time is set larger than the amount of molten metal recirculated per short time in the reflux process. 12. The method for producing a continuously cast aluminum material according to any one of 8 to 11 above, wherein the

[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 melted molten metal, and continuous casting of the molten metal supplied from the holding step to obtain a continuously cast material. each comprising a step and
Any one of the melting step and the holding step in the second manufacturing step while flowing the surplus molten metal that has not been subjected to casting in the casting step of the first manufacturing step in a state of less than 100% solid fraction. 1. A method for producing a continuously cast aluminum material, characterized by including a flow transfer step of mixing into a molten metal.

According to the manufacturing apparatus for aluminum casting material of the invention [1], since surplus molten metal not used for casting by the casting machine is returned to the holding furnace or the like by the recycling machine, the waste amount of the molten metal as the metal material can be reduced. It can be reduced, and the material yield can be improved and the cost can be reduced. Furthermore, since the flow rate of the molten metal flowing through the molten metal channel can be increased by the amount of the molten metal being circulated, the temperature drop of the flowing molten metal can be prevented, and a high-quality continuously cast aluminum material can be produced.

According to the apparatus for manufacturing aluminum casting material of the invention [2], since surplus molten metal is circulated to the holding furnace, the components of the circulated molten metal and the molten metal previously stored in the holding furnace can be substantially equal, It is possible to prevent variations in the components of the molten metal and further improve the quality of the cast aluminum material.

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

According to the apparatus for manufacturing an aluminum cast material of the invention [4], surplus molten metal can be efficiently and smoothly circulated.

According to the apparatus for manufacturing aluminum castings of the invention [5], by adjusting the output of the electromagnetic pump, it is possible to adjust the circulation amount of surplus molten metal, and in turn, to appropriately control the circulation amount of molten metal in the entire apparatus. Therefore, it is possible to efficiently produce an aluminum continuous cast material in a more stable state.

According to the production apparatus for aluminum cast material of the invention [6], it is possible to more reliably prevent adverse effects due to temperature drop of the molten metal.

According to the production apparatus for aluminum castings of invention [7], similarly to the above, it is possible to produce high-quality aluminum continuous castings while improving material yield and reducing costs.

According to the method for manufacturing an aluminum cast material of the invention [8], since the manufacturing process of the apparatus invention is specified, similarly to the above, it is possible to reduce the waste amount of molten metal and the cost, while achieving high quality. Aluminum continuous cast material can be produced.

According to the method for producing an aluminum cast material of invention [9], sufficient fluidity can be imparted to surplus molten metal, and surplus molten metal can be recirculated more reliably.

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

According to the method for producing an aluminum cast material of the invention [11], it is possible to more reliably prevent adverse effects due to a temperature drop of the molten metal.

According to the method for producing an aluminum cast material 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 furthermore, it is possible to manufacture a high-quality continuously cast aluminum material.

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

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

As shown in both figures, the manufacturing apparatus of this embodiment comprises 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 constituted by a heating furnace such as an electrolytic furnace, and is used to prepare the molten metal W1 by charging and melting the aluminum solid material before melting, and to adjust the components of the molten metal W1.

The holding furnace 12 is composed of a heating furnace such as an electrolytic furnace, and is used to transfer the molten metal W1 melted in the melting furnace 11, hold the molten metal W1 in a stable state, and perform cleaning and component adjustment. is. Furthermore, the holding furnace 12 is mainly intended to hold the molten metal W1 in a stable state, although a solid material may be charged and melted when adjusting the components as necessary. The holding furnace 12 is generally not as powerful as the electrolysis furnace 11 .

In this embodiment, the case where the melting furnace 11 and the holding furnace 12 are separately used is described as an example. A single melting and holding furnace having the functions of both the melting furnace 11 and the holding furnace 12 and constituted by a heating furnace such as an electrolytic furnace may be used.

In the manufacturing apparatus of the present embodiment, an inter-furnace passage 15 constituted by a gutter or the like is installed between the melting furnace 11 and the holding furnace 12, and the molten metal W1 melted by the melting furnace 11 flows through the inter-furnace passage 15. flows down by its own weight and is supplied into the holding furnace 12 .

Between the holding furnace 12 and the casting machine 2, a forward casting path 25 configured by a gutter or the like is installed. configured to be supplied.

The casting machine 2 is composed of a vertical continuous casting apparatus in which the casting direction is set vertically downward. Ingot) W2 is semi-continuously manufactured.

Further, in this embodiment, the recycling machine 3 has a function of returning surplus molten metal W1 that has not been cast by the casting machine 2 to the holding furnace 12 .

That is, a molten metal discharge section 30 for discharging surplus molten metal W1 that has not been used for casting to the outside (downstream side) of the casting machine 2 is provided at the downstream end of the outward casting path 25. The molten metal discharge section 31 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 composed of a gutter, piping, or the like is installed.

When the electromagnetic pump 36 is driven, excess molten metal W1 is sucked from the molten metal discharge portion 30 through the suction port of the electromagnetic pump 36 and 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 under its own weight and is returned into the holding furnace 12 .

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

In the present embodiment, the process of melting the solid material by the melting furnace 11 is called the melting process, and the process of holding the molten metal W1 by the holding furnace 12 is called the holding process. The process of casting by the machine 2 is called a casting process, and the process of recycling surplus molten metal W1 not used for casting by the recycling machine 3 to the holding furnace 12 is called a recycling process.

In the production 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 passage 15, and the molten metal W1 from the holding furnace 12 passes through the forward casting path 25 to the casting machine. 2. A molten metal W1 supplied to the casting machine 2 is solidified through a mold to produce a continuously cast material W2. On the other hand, in the casting machine 2, surplus molten metal W1 that has not been used for casting is pumped up by an electromagnetic pump 36 and returned to the holding furnace 12 through a return path 35.

According to the manufacturing apparatus for continuously cast aluminum material of the present embodiment configured as described above, surplus molten metal W1 that has not been used for casting by the casting machine 2 is returned to the holding furnace 12 by the recirculator 3. Therefore, 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 forward casting path 25 is increased by the amount of the molten metal W1 being circulated, and the cooling of the molten metal W1 is difficult, so that the temperature drop of the flowing molten metal W1 can be effectively prevented. . For example, the temperature difference between the molten metal W1 in the mold on the upstream side and the molten metal W1 in the mold on the downstream side in the casting machine 2 can be reduced, and the quality variation of the continuously cast material W1 as a product due to the difference in molten metal temperature can be reduced. Therefore, it is possible to produce a high-quality continuously cast material W2 in a stable state from beginning to end.

For reference, in a conventional manufacturing apparatus that does not circulate molten metal, there is a gap of 50 between the molten metal in the most upstream mold that is first poured in the casting machine 2 and the molten metal in the most downstream mold that is lastly poured in. Although a temperature difference of about °C may occur, this temperature difference can be reduced in the manufacturing apparatus of the present embodiment.

Further, by recirculating the surplus molten metal W1 to the cage 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 this embodiment, the molten metal W1 can be circulated between the holding furnace 12, the outward casting path 25, and the recirculator 3 after a predetermined casting process is completed and until the next casting process is started. . As a result, the molten metal passages 25 and 35 can be kept at an appropriate high temperature, preheating work before starting casting can be omitted, and the temperature can be raised to the target temperature immediately when starting casting. Therefore, it is possible to start casting in a short time from the casting stop state, improve production efficiency, and reliably suppress quality deterioration of the ingot structure due to a decrease in molten metal temperature, resulting in high quality casting (ingot) products. An aluminum continuous cast material W2 can be produced. Furthermore, before starting casting, there is no need to preheat the molten metal flow path or waste molten metal for cleaning, and from this point as well, effective use of materials can be achieved, yield improvement and cost reduction. can be achieved.

Furthermore, in the present embodiment, the molten metal W1 can be circulated even after the forging process is completed. It does not remain in the flow paths 25 and 35, and the waste amount of the molten metal W1 can be greatly reduced, and the cost required for recycling the waste material can be reduced. In other words, it is possible to reliably reduce the size and quality of the cast material W2 while reducing costs.

Furthermore, in the manufacturing apparatus of the present embodiment, the surplus molten metal W1 is flowed and returned to the holding furnace 12, so the surplus material (molten metal W1) can be automatically recovered and reused, improving work efficiency. The yield can be improved without deteriorating, and the cost can be further reduced.

Here, in this embodiment, in order to flow the surplus molten metal W1 back to the holding furnace 12, it is necessary to adjust the solid fraction of the surplus molten metal W1 to less than 100%. In particular, by adjusting the solid fraction of the molten metal W1 to 50% or less, it is possible to impart sufficient fluidity to the surplus molten metal W1, thereby allowing the molten metal W1 to flow back more smoothly. Therefore, problems such as clogging or blockage of the circulation path 35 or the piping system of the electromagnetic pump 36 due to solidification of the surplus molten metal W1 can be reliably prevented.

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

Furthermore, in the present embodiment, a heater for heating the surplus molten metal W1 may be arranged in the circulation machine 3 such as the circulation path 35. In this case, by heating the molten metal W1 to be circulated, it is possible to more reliably prevent the temperature of the molten metal W1 from lowering. and blockage can be prevented more reliably. Furthermore, since the surplus molten metal W1 can be charged into the holding furnace 12 while maintaining a predetermined temperature, the temperature difference between the molten metal W1 previously stored in the holding furnace 12 and the molten metal W1 to be circulated is reduced. can be reduced, and the temperature of the molten metal in the holding furnace 12 can be kept at an appropriate temperature. Therefore, the molten metal W1 in a stable state can always be supplied to the casting machine 2, and the continuously cast material W2 of higher quality can be manufactured.

Further, in the present embodiment, the surplus molten metal W1 discharged from the casting machine 3 is recirculated into the holding furnace 12, so that the components of the recirculated molten metal W1 and the The components of the molten metal W1 are almost the same. For this reason, it is possible to reliably prevent the problem that the composition of the molten metal W1 in the holding furnace 12 changes due to the recirculation of the molten metal W1, and it is possible to supply the molten metal W1 with stable components to the casting machine 2. From this point as well, A continuous cast material W2 of high quality can be produced.

Further, in the present embodiment, since the molten metal W1 is circulated to prevent the temperature of the molten metal W1 from dropping, there is no need to excessively raise the temperature of the molten metal W1 discharged from the melting furnace 11, and the fine grains are lost. It is possible to prevent an increase in the amount of hydrogen gas in the molten metal and the like, thereby further improving the quality of the continuously cast material W2.

Further, in this embodiment, the excess molten metal W1 discharged from the forging machine 2 is pumped up by the electromagnetic pump 36 and returned. ) can be adjusted, and consequently, the circulation amount of the molten metal W1 in the entire apparatus can be appropriately controlled, and the continuously cast material W2 can be efficiently manufactured in a stable state without variations.

Further, in the present embodiment, it is preferable that the molten metal W1 used for casting in the casting machine 2 has a larger volume (flow rate) per unit time than the surplus molten metal W1 that is returned without being used for casting. That is, if the surplus molten metal W1 to be recirculated becomes too large, the casting amount will decrease, which may lead to a decrease in production efficiency. Therefore, as described above, by increasing the amount of molten metal W1 to be forged, production efficiency can be reliably improved while preventing deterioration in quality due to temperature drop or the like.

In this embodiment, the surplus molten metal W1 discharged from the casting machine 3 is recirculated to the holding furnace 12. However, the present invention is not limited to this, and the surplus molten metal W1 is recirculated to the melting furnace 11. You can let them do it. Further, the surplus molten metal W1 may be branched to both the melting furnace 11 and the holding furnace 12 to be circulated.

<Second embodiment>
3 and 4 are schematic diagrams showing a manufacturing apparatus for continuously cast aluminum material according to a second embodiment of the present invention. As shown in both figures, the manufacturing apparatus of the second embodiment comprises 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 the functions of both the melting furnace 11 and the holding furnace 12 .

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

One end (downstream end) of the return path 35 is connected to the melting and holding furnace 1 , and the other end (upstream end) is arranged above the molten metal discharge section 30 of the casting machine 2 . It is

The first and second buffer tanks 31 and 32 are located at a molten metal recovery position (the position where the first buffer tank 31 is arranged in FIG. 3) corresponding to the molten metal discharge section 30 and a molten metal pouring position (the position at which the first buffer tank 31 is arranged in FIG. The position where the first buffer tank 31 is arranged in FIG. 4) and the retracted position corresponding to the lower part of the molten metal discharge section 30 (the position where the second buffer 32 is arranged in FIG. 3). In addition, at the molten metal pouring position, it is configured to be tiltable toward the reflux path 35 side.

Each of the buffer tanks 31 and 32 is configured so as to be able to recover surplus molten metal W1 discharged from the molten metal discharge section 30 when positioned at the molten metal recovery position, and is positioned at the molten metal pouring position. is configured such that 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 at the retracted position, it does not affect the molten metal recovering operation and pouring operation of the remaining buffer tank.

In the manufacturing apparatus of the second embodiment, the rest of the configuration is substantially the same as that of the manufacturing apparatus of the first embodiment, so that the same parts are given the same reference numerals, and redundant explanations are omitted.

In the manufacturing apparatus of the second embodiment, for example, as shown in FIG. 3, casting is started with the first buffer tank 31 arranged at the molten metal recovery position and the second buffer tank 32 arranged at the retracted position. Then, the molten metal W1 poured out from the melting and holding furnace 1 flows down the outward casting path 25 by its own weight and is transferred to the casting machine 2, and the molten metal W1 passes through the mold of the casting machine 2 and solidifies to a predetermined length. A bar-shaped continuous cast material (ingot) W2 having a thickness is successively produced.

Surplus molten metal W1 not used for casting out of the molten metal W1 supplied to the casting machine 2 is discharged from the molten metal discharge section 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 filled, the first buffer tank 31 is lifted and placed at the molten metal pouring position as shown in FIG. At the same time, the second buffer tank 32 rises and is placed at the molten metal recovery position. The surplus molten metal W1 discharged from the molten metal discharging portion 30 is continuously collected by the second buffer tank 32 . In this embodiment, while the collection of the molten metal W1 by the first buffer tank 31 is switched to the collection of the molten metal W1 by the second buffer tank 32, in order to prevent the leakage of the molten metal W1, the molten metal is discharged from the molten metal discharge section 30. A means for temporarily stopping the discharge of W1 may be provided.

Also, the first buffer tank 31 arranged at the molten metal pouring position tilts and pours the molten metal W1 therein into the recirculation path 35 . The surplus molten metal W1 thus poured into the return path 35 flows through the return path 35 under its own weight and is returned to the melting and holding furnace 1 . Furthermore, after all the molten metal W1 in the first buffer tank 31 has been poured out to the return path 35, the first buffer tank 31 moves from the tilted state to the regular While returning to the state, it moves to the retracted position while avoiding interference with the second buffer tank 32 .

Continuously-cast rods W2 are continuously manufactured by continuously repeating the above-described operations.

In the manufacturing apparatus of the second embodiment, as in the first embodiment, surplus molten metal W1 that has not been used for casting is returned to the melting and holding furnace 1, thereby circulating the molten metal W1. , effects similar to those of the first embodiment can be obtained.

In the second embodiment, by providing the buffer tanks 31 and 32 with heaters for heating the molten metal W1, it is possible to reliably prevent problems caused by a temperature drop in the refluxed molten metal W1.

<Third Embodiment>
FIG. 5 is a perspective view schematically showing an apparatus for manufacturing continuously cast aluminum 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 equipment includes a first melting and holding furnace 1a for performing the melting process and the holding process, a first casting machine 2a for performing the casting process, and supplying molten metal W1 from the first melting and holding furnace 1a to the first casting machine 2a. and a first casting forward path 25a. Further, the second manufacturing equipment includes a second melting and holding furnace 1b for performing the melting process and the holding process, a second casting machine 2b for performing the casting process, and supplying the molten metal W1 from the second melting and holding furnace 1b to the second casting machine 2b. and a second casting forward path 25b.

The manufacturing apparatus of the present embodiment also includes a coupler 4 for transferring surplus molten metal W1 that has not been cast in the first casting machine 2a to the second melting and holding furnace 1b.

The coupling machine 4 includes a molten metal discharge section 30a for discharging the molten metal W1 that has not been used for casting in the first casting machine 2a, and a connection flow path 45 for connecting the second melting and holding furnace 1b. Excess molten metal W1 to be discharged flows down by its own weight through the connecting channel 45 and is supplied into the second melting and holding furnace 1b.

In this embodiment, the process of transferring the surplus molten metal W1 from the first casting machine 2a to the second melting and holding furnace 1b by the coupler 4 is called a flow transferring process.

In this embodiment, the excess molten metal W1 is not discharged from the second casting machine 2b. Excess molten metal W1 may be discharged and returned to the melting and holding furnace 1a on the upstream side, or may be supplied to the next melting and holding furnace arranged on the downstream side.

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 production apparatus of the third embodiment, the molten metal W1 is supplied from the first melting and holding furnace 1a through the first outward casting path 25a to the first casting machine 2a, where it is cast to produce the continuous cast material W2. On the other hand, the surplus molten metal W1 that has not been used for casting in the first casting machine 2a is discharged from the molten metal discharge portion 30a and supplied through the connecting passage 45 to the second melting and holding furnace 1b. The molten metal W1 supplied to the second melting and holding furnace 1b is mixed with the molten metal W1 previously stored in the second melting and holding furnace 1b, and the molten metal W1 in the second melting and holding furnace 1b is transferred to the second casting outward path 25b. to the second casting machine 2b. The molten metal W1 supplied to the second casting machine 2b is cast there to produce a continuously cast material W2.

If there is no height difference between the molten metal discharge section 30a of the first casting machine 2a and the second melting and holding furnace 1b, and it is difficult to cause the molten metal W1 to flow along the connecting flow path 45 by its own weight, the above-described embodiment can be used. As described above, the coupler 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 surplus molten metal W1 that has not been cast by the first casting machine 2a is supplied to the second melting and holding furnace 1b by the coupler 4. Therefore, the excess molten metal W1 is supplied to the second melting and holding furnace 1b, and the flow rate of the molten metal W1 flowing in the molten metal flow path such as the first outward casting path 25a is increased, making it difficult to cool the molten metal W1 and lowering the temperature of the molten metal W1. can be prevented. Therefore, similarly to the above, it is possible to efficiently manufacture a high-quality continuously cast material W2.

Further, in the third embodiment, if a temperature raising device is provided in the connecting machine 4 to raise the temperature of the surplus molten metal W1 discharged from the first casting machine 2a and supply it to the second melting and holding furnace 1b, , the fluctuation of the melting temperature in the second melting and holding furnace 1b can be prevented, and the continuously cast material W2 can be manufactured in a more stable state.

In the above-described third embodiment, the case where the first and second two manufacturing facilities are arranged in series has been described as an example. You may make it arrange|position in series. Furthermore, in the present invention, after arranging two or more production facilities in series, a molten metal discharge section is provided in the casting machine of the final (downstream end) production facility, and surplus molten metal discharged from the melting and discharging section may be circulated to the melting furnace, holding furnace, or melting and holding furnace in any one of the upstream manufacturing facilities 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 continuously cast aluminum material according to a fourth embodiment of the present invention. As shown in the figure, in the manufacturing apparatus of the fourth embodiment, a horizontal (horizontal) continuous casting machine in which the casting direction is set horizontally (sideways) is used as the casting machine 2 .

Since other configurations of the manufacturing apparatus of the fourth embodiment are substantially the same as those of the first embodiment, the same parts are denoted by the same reference numerals, and redundant explanations are omitted.

In the manufacturing apparatus of this embodiment, the molten metal W1 in the melting and holding furnace 1 is supplied to the casting machine 2 through the forward casting path 25, where the molten metal W1 passes through the mold and solidifies to form a rod-shaped continuous cast material (ingot). ) W2 are fed continuously in the horizontal direction. Further, surplus molten metal W1 not used for casting in the casting machine 2 is sucked from the molten metal discharge portion 30 through the suction port of the electromagnetic pump 36 and is discharged from the discharge port of the electromagnetic pump 36 to the return path 35 . The molten metal W1 discharged through the reflux path 35 flows down the reflux path 35 and is returned into the melting and holding furnace 1. As shown in FIG.

Also in the manufacturing apparatus of the fourth embodiment, as in the first and second embodiments, surplus molten metal W1 that has not been subjected to casting is returned to the melting and holding furnace 1 to circulate the molten metal W1. Therefore, effects similar to those of the first and second embodiments can be obtained.

In addition, in the fourth embodiment, by providing a heater for heating the molten metal W1 in the circulation path 35 of the circulation machine 3, it is possible to reliably prevent problems due to a decrease in the temperature of the molten metal W1 to be circulated. .

INDUSTRIAL APPLICABILITY The apparatus for producing continuously cast aluminum products of the present invention can be suitably used for producing continuously cast aluminum products used as materials for, for example, extruded aluminum products, rolled products, forged products, and the like.

1, 1a, 1b: melting and holding furnace 11: melting furnace 12: holding furnace 2, 2a, 2b: casting machine 3: reflux machine 35: reflux path 36: electromagnetic pump (reflux pump)
4: Coupling machine (fluid transfer machine)
W1: Molten metal W2: Continuous casting material

Claims (13)

An aluminum continuously cast material comprising a melting furnace for melting a solid material of aluminum, a holding furnace for holding the molten metal, and a casting machine for continuously casting the molten metal supplied from the holding furnace to obtain a continuous cast material. A manufacturing device,
The casting machine comprises a plurality of molds for solidifying molten metal,
A molten metal discharge unit for discharging surplus molten metal that has not been supplied to the plurality of molds is provided on the downstream side of the casting machine,
An apparatus for manufacturing an aluminum continuous casting material, comprising: a recirculator for recirculating surplus molten metal discharged from the molten metal discharge part to either one of the melting furnace and the holding furnace without solidifying it. . 2. The apparatus for manufacturing continuously cast aluminum material according to claim 1, wherein said recirculator recirculates the molten metal to said holding furnace. 2. The apparatus for manufacturing an aluminum continuous cast material according to claim 1, wherein said melting furnace and said holding furnace are constituted by a melting and holding furnace that serves as both furnaces. The reflux machine includes a reflux path provided between the casting machine and one of the heating furnaces, and a reflux pump for flowing and moving the molten metal toward the one heating furnace along the reflux path. The apparatus for manufacturing an aluminum continuous cast material according to any one of claims 1 to 3, comprising: 5. The apparatus for manufacturing continuously cast aluminum material according to claim 4 , wherein said reflux pump comprises an electromagnetic pump. The apparatus for producing continuously cast aluminum 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 melted molten metal, and continuous casting of the molten metal supplied from the holding furnace to obtain a continuously cast material. each equipped with a machine and
Fluid transfer in which excess molten metal not used for casting in the casting machine of the first production facility is flowed and transferred to either one of the melting furnace and the holding furnace of the second production facility without being solidified. A manufacturing apparatus for continuously cast aluminum, characterized by comprising a machine. Manufacture of continuously cast aluminum material including a melting step of melting a solid material of aluminum, a holding step of holding the molten aluminum, and a casting step of continuously casting the molten metal supplied from the holding step to obtain a continuous cast material. a method,
In the casting step, the molten metal is solidified by a plurality of molds of a casting machine,
Excess molten metal not supplied to the plurality of molds is discharged from a molten metal discharge section provided downstream of the casting machine,
characterized by including a reflux step of flowing surplus molten metal discharged from a molten metal discharge portion provided downstream of the casting machine and returning it to the molten metal in either one of the melting step and the holding step while flowing. A method for producing an aluminum continuous cast material. 9. The method for producing a continuously cast aluminum material according to claim 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 a continuously cast aluminum material according to claim 8 or 9, wherein the refluxing of the molten metal in the refluxing step is continuously performed from the start of casting to the end of casting in the casting step. The method for producing a continuously cast aluminum material according to any one of claims 8 to 10, wherein the molten metal is heated in the reflux step. From the start of casting to the end of casting in the casting process, the amount of molten metal provided for casting in the casting process per unit time is increased relative to the amount of molten metal recirculated per unit time in the reflux process. The method for producing an aluminum continuously 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 melted molten metal, and continuous casting of the molten metal supplied from the holding step to obtain a continuously cast material. each comprising a step and
A flowing transfer step of mixing surplus molten metal not used for casting in the casting step of the first manufacturing step into the molten metal of either one of the melting step and the holding step in the second manufacturing step while flowing. A method for producing an aluminum continuous cast material, characterized by:

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