JPH11179499A - Vacuum float-up melting and continuous casting apparatus and method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high purity metallic material by executing melting operation in the vacuum to eliminate oxidization of metal and mixture of gas, etc., and by degassing and to obtain a high purity cast product by casting molten metal under the vacuum. SOLUTION: A float-up melting treatment chamber 22 constituted of a vacuum vessel in which a float-up melting furnace 20, a die with an upper and part fitted to a flow-out hole and with an outer peripheral part cooled with a cooler and cooling and solidifying the molten metal passed through therein, a water-cooled type cylindrical roller 16 drawing out the cast bar material and a cutter device 17 for cutting the bar material into a prescribed length are housed, is provided. A material supplying chamber 21 housing a melting material charging device 13 closely attached to the upper part of the treatment chamber 22 and charging the material to be melted, is arranged, and a bar material housing chamber 23 closely attached to the lower part of the treatment chamber 22 and housing the cut bar material is arranged, and a vacuum evacuating system 28 and an inert gas introducing means 30 making each of three chambers into separately vacuum condition or gas atmosphere are attached to the apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for inductively heating a conductive material to be melted in an alternating magnetic field by electromagnetic induction, and generating a magnetic field having a predetermined distribution to float the material to be melted by electromagnetic force. A flotation melting device that can obtain high-purity material by applying force and melting in a floating state.It melts high-purity molten metal, especially in vacuum, and continuously or intermittently melts the material to be melted from above. The present invention relates to a vacuum flotation melting continuous casting apparatus and a continuous casting method for continuously casting through a die provided at a lower outlet.

[0002]

2. Description of the Related Art FIG. 6 shows a configuration diagram of a conventional example. This figure 6
Wherein 1 is a crucible made of refractory material, 2 is an induction coil wound around the outer periphery of the crucible 1, and 3 is mounted on the bottom of the crucible 1, and casts the molten metal in the crucible 1 when casting it. A die 5 to be cooled and formed into a bar 4 is a die 3
A cooler that surrounds and cools on the outer peripheral side;
A cylindrical roller for pulling down the bar material 5 cast by the above, a guide roller 7 for guiding the cast bar material 4, a bearing 8 for the cylindrical roller 6, and a driving motor 9 for the cylindrical roller 6 . In FIG. 6, an induction coil 2 is wound around the outer periphery of the crucible 1 for inductively heating and melting the molten material put into the crucible 1, and a cooler 5 is provided at the bottom of the crucible 1 from the outer periphery side. Cooled die 3
Is installed. A bearing 8 is provided below the die 3.
, And a cylindrical roller 6 connected to a drive motor 9 is disposed, and pulls downward with a bar material cast by the die 3 interposed therebetween.

In the above configuration, first, a stopper (not shown) made of the same material as the bar 4 is inserted into the die and supported by being sandwiched between the cylindrical rollers 6. throw into. The introduced molten material is melted by the induction coil 2 to become a molten metal, and after being adjusted to a predetermined temperature and a predetermined component, the cylindrical roller 6 supported by the bearing 9 is driven by the drive motor 9 and is not shown. As the plug is slowly pulled out, the molten metal guided into the die 3 is cooled by the die 3 whose outer peripheral side is water-cooled by the cooler 5 and continuously cast into the bar 4.

[0004] The parts from the crucible 1 to the cylindrical roller 6 are used in a state of being incorporated in a gantry in the atmosphere.

[0005]

By the way, in the conventional structure, the melting is performed in the air. However, in the air, the oxidized metal is mixed during the melting, and the purity of the melted material is reduced. For this reason, a method of melting and casting in an inert gas atmosphere has been proposed and implemented. In the inert gas, oxidation of metal is reduced, but gas contained in the melted material is not removed and melting is performed. The purity of the material could not be improved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. It is an object of the present invention to eliminate the oxidation of metals and the incorporation of gases, etc. To obtain a high-purity metal material, and
It is an object of the present invention to provide a vacuum levitation melting continuous casting apparatus and method capable of obtaining a high-purity cast product by continuously casting a molten metal in a vacuum.

[0007]

In order to solve the above-mentioned problems, the present invention is directed to a metal crucible in which segments made of a good conductive metal are laminated in the circumferential direction via an insulator and an outlet is formed at the bottom. And a flotation melting furnace having an induction coil wound on the outer periphery of the crucible, and an upper end portion is attached to the outlet, and the outer peripheral side is cooled at a lower portion of the outlet by surrounding the outer peripheral side with a cooler. A rod-forming die for cooling and solidifying the passing molten metal, a water-cooled cylindrical roller for pulling the rod cast by the rod-forming die during casting, and a rod drawn from the cylindrical roller. A flotation / melting processing chamber containing a cutter device for cutting into a length is provided in a vacuum vessel, and a vacuum vessel is provided in an upper part of the flotation / melting processing chamber in a vacuum-tight manner in close contact with the flotation / melting processing chamber. Add conductive material to be melted A bar for storing a bar material cut off by the cutter device, comprising a material supply chamber containing a molten material charging device, and a vacuum vessel provided in a lower part of the floating melting processing chamber in an airtight and tight contact with the floating melting processing chamber. A material storage room is provided.

According to a second aspect of the present invention, in the vacuum flotation continuous casting apparatus according to the first aspect, an opening and closing can be performed between a material supply chamber for charging a material to be melted into a crucible and a flotation melting processing chamber. In addition to providing a first vacuum gate valve for partitioning, a floating and melting treatment chamber, and a second vacuum gate valve for partitioning between the bar storage chamber so as to be openable and closable, inside the vacuum vessel, a material supply chamber, It is characterized in that it is divided into three independent chambers of a flotation melting processing chamber and a bar storage chamber. .

According to a third aspect of the present invention, in the vacuum flotation continuous casting apparatus according to the first or second aspect, the upper opening of the crucible is openably opened above the crucible to shield radiant heat from the molten metal. It is characterized by having a reflector. Further, the invention described in claim 4 is the same as the claim 1.
In the vacuum levitation melting continuous casting apparatus according to any one of claims 3 to 5, a temperature control unit for controlling a cooling water temperature of a water-cooled cylindrical roller and a cooling jacket is provided.

According to a fifth aspect of the present invention, there is provided the vacuum floating melting continuous casting apparatus according to any one of the first to fourth aspects, wherein each of a material supply chamber, a floating melting processing chamber, and a bar storage chamber. And an inert gas introducing means capable of supplying an inert gas alone. According to a sixth aspect of the present invention, in the vacuum flotation continuous casting apparatus according to any one of the first to fifth aspects, each of the material supply chamber, the flotation melting processing chamber, and the rod storage chamber is independently vacuumed. Be able to control exhaust and pressure.

The crucible, the induction coil installed on the outer diameter side of the crucible, the die mounted on the crucible bottom outlet, and water-cooled by the cooler, according to the above-described claims 1 to 6,
A flotation and melting treatment chamber in which a cylindrical roller that continuously pulls out a bar and a cutter device that cuts the bar into a predetermined length and installed in a single vacuum vessel, and a vacuum gate valve on the upper part thereof,
A divided vacuum container with a material supply chamber containing a molten material charging device for charging the material inside, and a vacuum container divided through a vacuum gate valve below the flotation melting processing chamber with a rod inside. To be divided into three chambers, and
Since each vacuum chamber can be evacuated individually, only the material supply chamber is returned to the atmospheric pressure when supplying the material, and the material can be supplied while the floating melting processing chamber and the rod storage chamber remain in vacuum. Will be possible.

When the material is supplied to the crucible in the vacuum chamber, the material supply chamber is evacuated and the pressure is balanced with the high-vacuum flotation processing chamber to prevent the generation of a differential pressure, thereby preventing the generation of dust. The molten material can be supplied while preventing dust from rising. This enables high-purity melting even when, for example, adding a material during the melting operation in the flotation melting processing chamber or supplying another material to form an alloy.

When the bar storage chamber is full and the bar is to be removed, continuous casting is interrupted, the second vacuum gate is closed, and an inert gas is supplied to the bar storage chamber. To atmospheric pressure, separate the bar storage chamber, take out the bar, re-attach the bar storage chamber, evacuate the bar storage chamber, open the second vacuum gate valve and continuously cast Can be resumed.

Also during this time, the flotation processing chamber can be maintained in a vacuum state and is prepared for the next melting operation while preventing generation of dust, dust and impurity gas. It is possible to cast a high-purity rod without mixing of dust, dust, and impure gas. In addition, the reflector that covers the upper opening of the crucible so that it can be opened and closed shields radiant heat from the molten metal in the crucible, so that it is possible to prevent thermal distortion of devices above the crucible, such as the first vacuum gate valve. .

Further, since the water-cooled cylindrical roller and the cooling jacket are provided with a temperature control unit for controlling the temperature of the cooling water, it is possible to control the cooling speed at the time of casting the bar and to optimize the casting. Become. According to a seventh aspect of the present invention, all of the material supply chamber, the flotation / melting processing chamber, and the bar storage chamber are set to the atmospheric pressure, and the first and second vacuum gate valves are opened to perform the flotation / melting processing. A starting block having the same cross-sectional shape as the bar is sandwiched between the cylindrical rollers in the chamber, and the cylindrical roller is driven to mount the starting block in the die for forming the bar, and to supply the melting material to the crucible and supply the material to the material supply chamber. Open the door to supply the conductive material to be melted to the molten material charging device in the room, and after supplying the material,
All three chambers are evacuated to a predetermined degree of vacuum, the material is floated and melted, and after the melting is completed, the molten metal is continuously cast into a die while driving the cylindrical roller to lower the starting block, and the die is used for the die. The bar is cooled and solidified into a bar, pulled out downward, and cut each time the bar reaches a predetermined length. The bar is cut by a cutter device, and the cut bar is stored in a bar storage chamber. When the bar is stored, the continuous casting is stopped, the second vacuum gate valve between the flotation processing chamber and the bar storage chamber is closed, and an inert gas is introduced into the bar storage chamber. After the bar storage chamber is made almost the same as the atmospheric pressure, the bar storage chamber is separated, the bar is carried out, and an empty bar storage chamber is mounted below the flotation processing chamber. After evacuating to a predetermined degree of vacuum, the second vacuum gate valve is opened, and continuous casting is re-established. Characterized in that the.

The invention according to claim 8 is the vacuum floating melting continuous casting method according to claim 7, wherein the molten material is continuously supplied to the crucible by a predetermined amount during continuous casting to continuously melt the material. When the amount of dissolved material in the supply chamber is insufficient, the first vacuum gate valve is closed, an inert gas is supplied into the material supply chamber, and the pressure in the chamber is substantially equal to the atmospheric pressure. Open and supply the conductive material to be melted to the molten material charging device in the chamber, after the material is supplied, the evacuation system to evacuate the material supply chamber, after reaching a predetermined degree of vacuum, the first The vacuum gate valve is opened, and the supply of the molten material to the crucible is restarted to perform continuous melting and continuous casting.

[0017] According to the structure of the seventh and eighth aspects, it is possible to continuously perform from the material supply to the melting operation and the casting operation in the vacuum vessel.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a configuration diagram of a main part of an embodiment of the present invention, and FIG. 2 shows a configuration diagram of a flotation melting furnace of FIG. In FIGS. 1 and 2, the members denoted by the same reference numerals as those of the conventional example have almost the same functions, and therefore the description thereof will be omitted.

In FIGS. 1 and 2, reference numeral 10 denotes an outlet 10b formed in a cylindrical shape having a bottom and formed at the bottom thereof for discharging a molten metal; Crucible made of good conductive metal with slit, 10
a a molten metal in which a material to be melted is melted in a crucible 10;
c is a manifold for supplying and discharging cooling water to and from the crucible 10;
Reference numeral 1 denotes an induction coil that simultaneously applies both induction heating and levitation force by electromagnetic force to a material to be melted by using eddy current flowing by electromagnetic induction, 12 denotes an AC power supply that supplies current to an induction coil 11, and 12a denotes an induction coil. AC power supply 12 for coil 11
When a conductor for supplying electric power from a vacuum vessel is introduced into a vacuum vessel forming a flotation / melting processing chamber described later, the conductor is insulated from the vacuum vessel, and an insulating flange for vacuum-sealing the introduction section is provided on the crucible 10. A molten material charging device for supplying a molten material, a bar forming die 14 mounted on an outlet 10b at the bottom of the crucible 10 to cool and solidify the molten metal 10a when casting the molten metal 10a and to cast the molten metal 10a into a rod 4. , 15 are coolers for cooling the bar forming die 14 on the outer peripheral side,
Is a cylindrical roller arranged to face the bar 4 so as to sandwich the bar 4 for drawing out the bar 4 formed by the bar forming die 14, 16a is a rotary shaft for transmitting a rotational force to the cylindrical roller 16, 16b Is a vacuum bearing that supports a rotary shaft 16a that penetrates a side wall of a vacuum vessel that forms a flotation melting processing chamber described later, 16c is a vacuum flange that vacuum seals the bearing 16b and the outer wall surface of the vacuum vessel, and 16d is a cylinder. A cooling water supply / drain port for passing cooling water for cooling the roller 16 and the rotating shaft 16a, a cutter device 17 for cutting the cast bar 4 into a predetermined length, and a driving device 1 of the cutter device 17a
Reference numeral 8 denotes a vacuum seal flange which is installed outside the vacuum vessel forming a flotation / dissolution processing chamber to be described later and seals an introduction portion for connecting to a cutter body in the vacuum vessel. Reference numeral 19 denotes a rotating shaft 16a.
, A rotary drive mechanism (details will be described later with reference to FIGS. 4 and 5) for transmitting the driving force of one drive motor 19 to the four cylindrical rollers.

Reference numeral 21 denotes a material supply chamber which is formed of a vacuum container and accommodates a molten material charging device 13 for supplying a material to be melted to the crucible 10;
0, and cooling water manifold 10c, induction coil 11
Flange 12a for insulating and introducing a conductor supplying an AC power supply 12 to the coil 11 and the induction coil 11, a bar forming die 14, a cooling jacket 15, a cylindrical roller 16 for extracting the bar 4, and rotation of the cylindrical roller 16 A shaft 16a, a bearing 16b of the rotating shaft 16a, a vacuum flange 16b for vacuum-sealing the bearing 16b, a cutter mechanism 17 for cutting the rod 4 drawn downward by the cylindrical roller 16 into a predetermined length, Vacuum seal flange 17
a, Hydraulic cylinder 18 as drive source of cutter mechanism
Shows a flotation dissolution chamber to which is attached.

As described above, the levitation melting furnace 20 is composed of the crucible 10 and the induction coil 11, and an AC power supply is added thereto to form a levitation melting apparatus. The rotary shaft 16a of the cylindrical roller 16 is connected to a rotary drive mechanism 19a that is drawn out from the side of the vacuum vessel via a bearing 16b and a vacuum flange 16b that supports the bearing 16b and that transmits a driving force to the cylindrical roller 16. Have been. The rotating shaft 16a
Is a hollow shaft, and has a cooling water supply / drainage port 16d at both ends and has a water cooling structure through which cooling water flows.

Reference numeral 23 is provided below the flotation processing chamber 22, and is a bar storage chamber formed of a vacuum vessel. Reference numeral 24 partitions a part of a partition between the material supply chamber 21 and the flotation processing chamber 22 so as to be openable and closable. A first vacuum valve, 25 is a second vacuum valve for partitioning a part of a partition wall between the rod storage chamber 23 and the flotation processing chamber 22 so as to be openable and closable, and 26 is for the molten metal in the crucible 10 to fall before casting. Starting block 27 serving also as a stopper to be mounted in the rod forming die 14 in order to prevent the crucible 10
Above the opening, a reflector for shielding heat, which shields the radiant heat of the molten metal 1a; 27a, a turning mechanism for turning and retracting the reflector from above the crucible; 28, a vacuum exhaust system for exhausting the inside of the vacuum vessel; 28 is a shut-off valve, 29 is a door for supplying a material from the outside to the molten material charging device 13, 30 is an inert gas introducing means for supplying an inert gas into the vacuum vessel, and 30a is an inert gas introducing means 3
0 shows a gas shut-off valve.

Reference numeral 31 denotes a temperature control unit, which is connected to a cooling jacket 15 for cooling the bar material forming die 14 so that cooling water at a desired set temperature can be supplied. In FIG. 1, a metal crucible 10 in which a segment made of a good conductive metal is laminated in the circumferential direction via an insulator to form an outlet 10b at the bottom, and An induction coil 11 wound around the outer periphery, and a bar forming die 1 mounted on an outlet 10b of the crucible 10
4 and a cooler 15 for cooling the dies from the outside, and a rotating shaft 16a having a cooling water flow hole formed therein, and arranged so as to sandwich the bar 4 and the starting block 26 from both sides. A cylindrical roller 16 and a main body portion of a cutter 17 for cutting the bar 4 cast to a predetermined length;
A reflector 27 that opens and closes the opening of the metal crucible 10 is housed. The induction coil 11 is connected to an AC power supply 12 installed outside the vacuum vessel by an insulating flange 12.
a, and the reflector 27 is connected to a turning mechanism 27a installed outside the vacuum vessel.

The rotating shaft 16a of the cylindrical roller 16 penetrates both side walls of the vacuum vessel of the flotation / melting processing chamber 22, and the bearing 1 is vacuum-sealed with a vacuum flange 16c outside the side wall.
6b, a cooling water supply / drain port 16d and a rotary shaft 16 of the cylindrical roller 16 are provided outside the bearing 16b.
a is connected to a rotation drive mechanism 19a for driving a and a drive motor 19.

The main body of the cutter device 17 is connected to an external drive section 18 via a vacuum seal flange 17a. Further, a material supply chamber 21 containing the material input device 13 is provided above the flotation / melting processing chamber 22.
2 is mounted in a gas-tight manner via a first vacuum valve 24 that separates the bar material storage chamber 2 from a bar material storage chamber 23 partitioned by a second vacuum valve 25 below the flotation / melt processing chamber 22. It is detachably mounted below the second vacuum valve 25.

The material supply chamber 21, the flotation / melt processing chamber 22, and the rod storage chamber 23 are connected to a vacuum exhaust system 28 via shut-off valves 28a, respectively, and are separately provided with gas shut-off valves 30a. Is connected to the inert gas introducing means 30 via the Further, the cooling water of the cylindrical roller 16 and the cooling water of the cooler 15 are individually connected to a temperature control unit 31 that performs temperature control via a temperature sensor (not shown), and are controlled to set temperatures.

In the above configuration, when performing continuous casting by operating the vacuum floating melting continuous casting apparatus, first, the floating melting processing chamber 22, the storage chamber 23, and the material supply chamber 21 are evacuated to the vacuum exhaust system 28. After evacuating by vacuum, an inert gas is introduced from the inert gas introducing means 30 by opening the gas shut-off valve 30a, and the levitation melting processing chamber 22, the storage chamber 23, and the material chamber 21 are brought to atmospheric pressure, and then levitation melting is performed. A bar of the same material as the material to be melted as the starting block 26 or a bar having the same material attached only to the tip is inserted into the cylindrical roller 16 in the processing chamber 22.

Next, along with charging the material to be melted of the conductive metal into the crucible 10, the door 29 is opened and the material is also supplied to the molten material charging device 13 in the material supply chamber 21. From this state, the flotation / melting processing chamber 22, the bar storage chamber 23, and the material supply chamber 21 are evacuated by the vacuum evacuation system 28 to reduce the pressure to a predetermined pressure, and then the melting operation is started. The material to be melted in the crucible 10 is an induction coil 1 supplied with current from an AC power supply 12.
By the eddy current induced by the electromagnetic induction of No. 1, both the induction heating and the levitation force by the electromagnetic force are given simultaneously, and the molten metal 10a melts and floats. Similarly, the starting block 26 of the same material inserted earlier is also melted at the tip end in the rod forming die 14 and fused with the molten metal 10a. In this state, the cylindrical roller 16 is driven by the drive motor 19 via the rotation drive mechanism 19a and the rotation shaft 16a, and the starting block 26 is gradually pulled out. At the same time, the molten metal 10a is guided into the bar forming die 14, cooled by the cooling jacket 15 surrounding the outer periphery of the bar forming die 14, solidified and drawn out as the bar 4.

During melting, the reflector 27 is swiveled above the crucible 10 by the swivel mechanism 27a.
When the material to be melted earlier is reduced, the reflector 27 is retracted from above the crucible 10 by the revolving mechanism 27a in the opposite manner as described above. Then, the first vacuum gate valve 24 is opened, and the material to be melted is additionally charged from the melted material charging device 13.

The molten material charging device 1
When the material to be melted in 3 has run out, the first vacuum gate valve 24 is closed and an inert gas is injected only into the material supply chamber 21 to return to atmospheric pressure.
After the material to be melted is supplied to 3 and only the material supply chamber 21 is evacuated again, the reflector 27 is retracted from above the crucible 10 by the turning mechanism 27a, the first vacuum gate valve 24 is opened, and the melted material input device 13 Add additional material to be melted.

Further, after the rod 4 is formed by the rod forming die 14 and pulled downward by the cylindrical roller 16, the rod 4 is cut by a cutter mechanism 17 disposed below the cylindrical roller 16 when the rod 4 has a predetermined length. Then, it is stored in the bar storage chamber 23. Note that a hydraulic cylinder 18 is used as a drive source of the cutter mechanism 17. When a predetermined amount of the bar 4 is stored in the bar storage chamber 23, continuous casting is interrupted, and the second vacuum gate valve 25 between the flotation processing chamber 22 and the bar storage chamber 23 is closed. And the shut-off valve 28 connected to the bar storage chamber 23.
is closed and the evacuation of this chamber is cut off, and then the gas shut-off valve 30a connected to the rod storage chamber 23 is opened to introduce an inert gas from the inert gas introduction means 30 and to store the rod storage chamber 23. After the inside of the chamber is substantially equal to the atmospheric pressure, the bar storage chamber 23 is separated and the bar 4 is carried out, and the emptied bar storage chamber 23 is placed in a separated place below the second vacuum gate valve 25. Installing. Next, the gas shutoff valve 30a connected to the bar storage chamber 23 is closed, and the shutoff valve 28a connected to the same bar storage chamber 23 is opened, so that the inside of the bar storage chamber 23 has a predetermined degree of vacuum. Then, the second vacuum gate valve 25 is opened, and the continuous casting is resumed.

FIG. 3 is a block diagram of a main part of another embodiment of the present invention. The difference between FIG. 2 and FIG.
3, a guide roller 32 and a winding mechanism 33 are provided at the lower stage. In the figure, main components and functions are the same as those in the configuration diagram shown in FIG. FIG. 4 shows a drawing state of the rod material with the cylindrical roller 16. In the figure, two pairs of opposed cylindrical rollers 16 are shown.
By rotating in the opposite directions, the bar 4 sandwiched between the cylindrical rollers 16 can be moved up and down. That is, in the preparatory operation before melting, a rod (starting block 26) of the same material as the material to be melted or a material having only the same material attached only at the tip is sandwiched between the cylindrical rollers 16 and raised, so that the crucible 10 flows downward. It is inserted into the bar forming die 14 in the outlet 10b and stands by. When the bar is pulled out, it is lowered by the cylindrical roller 16.

FIG. 5 is a detailed view of the rotation drive mechanism for rotating the cylindrical roller 16. In the figure, two pairs of drive gears 3
4 meshes via two idle gears 35,
The drive motor 19 is connected to one of the drive gears. With such a configuration, the driving gear 34
When the gear is rotated, the opposing gear reverses, and another pair of driving gears 34 arranged vertically through the idle gear 35.
Also has a structure that is driven to rotate.

[0034]

According to the present invention, a bottomed cylindrical crucible in which segments made of a good conductive metal are laminated in a vacuum vessel in a circumferential direction via an insulating plate, and the outer periphery of the crucible is surrounded. An induction coil installed in a crucible, a melting material charging device for charging a conductive material to be melted from the top of the crucible, a bar forming die provided at a bottom outlet of the crucible, and a bar sandwiched under the die. A cylindrical roller disposed in such a manner as to face the same, a rotary drive mechanism for driving the cylindrical roller, a cutter device for cutting a bar formed by a bar forming die, and a storage container for storing the cut bar. As a result, it is possible to continuously perform the operations from material supply to melting operation and bar material forming operation in one vacuum vessel, and to form a higher purity bar material with less contamination of dust, dust, impurity gas, etc. Working rod-shaped metal material obtained That effect want.

Further, by disposing a reflector at the top of the crucible capable of opening and closing the opening of the crucible, it has the effect of blocking radiant heat during melting and preventing the upper portion of the vacuum vessel from being heated. Furthermore, the vacuum container is separated into three chambers of a molten material supply chamber, a flotation melting processing chamber, and a rod material storage chamber by a vacuum gate valve, and each vacuum chamber can be independently evacuated and pressure controlled, so that First, the volume of the vacuum chamber can be set to the optimal size and the optimal pressure according to the application. As a result,
This has the effect of reducing the capacity of the vacuum pump.

Further, even during the melting operation, it is possible to supply a new material, and it is possible to pull out the bar by vacuum floating melting continuous casting. Furthermore, the work can be easily taken out by making the bar storage chamber detachable.
Further, the bar storage room unit can be easily replaced, and the productivity can be improved. Further, through a temperature control unit, cooling water to be supplied to a cooling jacket that surrounds and cools the outer periphery of the bar material forming die mounted on the outlet at the bottom of the crucible,
By controlling the temperature, the optimum cooling temperature suitable for the molding material can be obtained, and the effect on the composition of the metal material is taken into account, and the influence of the solidification state when pulled out from the bar forming die on product defects is reduced. Has the effect of doing

Further, by adopting a system in which the rotational drive control of the cylindrical roller is controlled by one motor, a low-cost drawing mechanism can be provided. In addition, speed control and the like are easy, and optimal bar withdrawal control can be provided. In addition, since the three chambers are separated, a clean environment can be maintained without exposing all the chambers to the atmosphere even during maintenance.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a flotation melting furnace and equipment around the flotation melting furnace of FIG. 1;

FIG. 3 is a configuration diagram of a main part of another embodiment of the present invention.

FIG. 4 is a drawing showing a state in which a bar is pulled out by a cylindrical roller.

FIG. 5 is a detailed view of a rotation drive mechanism that rotates a cylindrical roller.

FIG. 6 is a configuration diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 4 rod material 10 crucible 10a molten metal 10b outlet 10c manifold 11 induction coil 12 AC power supply 12a insulating flange 13 molten material charging device 14 rod forming die 15 cooler 16 cylindrical roller 16a rotating shaft 16b bearing 16c vacuum flange 16d cooling water supply / drainage Mouth 17 Cutter device 17a Vacuum seal flange 18 Hydraulic cylinder 19 Drive motor 19a Rotary drive mechanism 20 Floating melting furnace 21 Material supply chamber 22 Floating melting processing chamber 23 Bar material storage chamber 24 First vacuum gate valve 25 Second vacuum gate valve 26 Starting block 27 Reflector 27a Reflector turning mechanism 28 Vacuum exhaust system 28a Shut-off valve 29 Door 30 Inert gas introduction means 30a Gas shut-off valve 31 Temperature control unit 32 Guide roller 33 Winding mechanism 34 Drive Gear 35 idle gear

Claims (8)

[Claims] 1. A metal crucible in which segments made of a good conductive metal are laminated in the circumferential direction via an insulator and an outlet is formed at the bottom.
And a flotation melting furnace having an induction coil wound around the outer periphery of the crucible, and an upper end attached to the outlet, surrounding the outer peripheral side with a cooler at a lower portion of the outlet, cooling, and passing through the inside. A rod-forming die for cooling and solidifying the molten metal to be melted, a water-cooled cylindrical roller for pulling out the rod cast by the rod-forming die during casting, and a rod drawn for a predetermined length from the cylindrical roller. A fusing and melting processing chamber containing a cutter device for cutting into a vacuum vessel is provided in a vacuum vessel, and a vacuum vessel is provided in an upper part of the flotation and melting processing chamber in a vacuum-tight manner in close contact with the flotation and melting processing chamber, and the A cutter provided with a material supply chamber accommodating a dissolving material charging device for charging a conductive material to be melted, and a vacuum vessel provided in a lower part of the floating melting processing chamber in airtight tight contact with the floating melting processing chamber; Cut at Vacuum levitation dissolution continuous casting apparatus characterized in that a rod storage chamber for accommodating a timber. 2. The vacuum flotation continuous casting apparatus according to claim 1, wherein a first vacuum gate valve for opening and closing a material supply chamber for charging the material to be melted into the crucible and a flotation melting processing chamber. And, a floating melting treatment chamber, and a second vacuum gate valve that opens and closes between the bar storage chamber is provided, inside the vacuum vessel, a material supply chamber, a floating melting treatment chamber,
A vacuum levitation melting continuous casting apparatus characterized by being divided into three independent chambers each having a bar storage chamber. 3. The continuous casting apparatus according to claim 1, further comprising a reflector provided above the crucible so as to open and close the upper opening of the crucible to shield radiant heat from the molten metal. Flotation continuous casting equipment. 4. The vacuum flotation continuous casting apparatus according to claim 1, further comprising a water-cooled cylindrical roller and a temperature control unit for controlling a cooling water temperature of the cooling jacket. Vacuum flotation continuous casting equipment. 5. The vacuum flotation continuous casting apparatus according to claim 1, wherein an inert gas is independently supplied to each of the material supply chamber, the flotation processing chamber, and the rod storage chamber. A vacuum levitation melting continuous casting apparatus comprising an inert gas introducing means capable of supplying the same. 6. The vacuum flotation continuous casting apparatus according to any one of claims 1 to 5, wherein each of the material supply chamber, the flotation processing chamber, and the rod storage chamber independently performs vacuum evacuation and pressure control. A vacuum levitation melting continuous casting apparatus characterized by being made possible. 7. The material supply chamber, the flotation / melting processing chamber, and the bar material storage chamber are all set to atmospheric pressure, the first and second vacuum gate valves are opened, and the cylindrical roller of the flotation / melting processing chamber is opened. Drive the cylindrical roller between the starting blocks having the same cross-sectional shape as the bar, mount the starting blocks in the bar forming dies, supply the melting material to the crucible, open the material supply chamber door, and open the room. The conductive material to be melted is supplied to the melted material charging device, and after the material is supplied, the three chambers are evacuated to a predetermined degree of vacuum by a vacuum exhaust system, and the material is floated and melted. While the cylindrical roller is driven and the starting block is lowered, the molten metal is continuously cast in a die, cooled and solidified by the die into a bar, and the bar is drawn downward. Cutting by device Then, when a predetermined amount of bar is stored in the bar storage chamber, continuous casting is stopped, and the cut between the floating melting processing chamber and the bar storage chamber is stopped. The second vacuum gate valve is closed, an inert gas is introduced into the bar storage chamber to make the bar storage chamber approximately the same as the atmospheric pressure, the bar storage chamber is separated, and the bar is carried out. The bar storage chamber is attached to the lower side of the flotation processing chamber, and the bar storage chamber is evacuated to a predetermined degree of vacuum. Then, the second vacuum gate valve is opened to rejoin the continuous casting. A vacuum levitation melting continuous casting method characterized in that: 8. The method according to claim 7, wherein the molten material is continuously supplied to the crucible by a predetermined amount during continuous casting, and the molten material is continuously melted. After closing the first vacuum gate valve and supplying an inert gas into the material supply chamber to make the chamber approximately the same pressure as the atmospheric pressure, the door of the material supply chamber is opened and the molten material charging device in the chamber is opened. After supplying the conductive material to be melted, after the material is supplied, the material supply chamber is evacuated by a vacuum exhaust system, and after reaching a predetermined degree of vacuum, the first vacuum gate valve is opened to open the material. A continuous fusing and melting continuous casting method characterized by resuming the supply of the molten material to the crucible and performing continuous melting and continuous casting.