JP2001138036A - Vacuum melting and casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum melting and casting apparatus, in which each operation of a melting furnace body for metal, etc., and a casting device, is rationalized and the idle time of the melting and casting chamber based on each operation, is reduced to obtain the high productivity. SOLUTION: The melting and casting chamber 11 and preparing chambers 31 at both sides thereof are adjacently arranged in the vacuum melting and casting apparatus 10 and also, two pieces of doors 16a, 16b having the size openable/closable to the opening part 13 at the back surface side of the melting and casting chamber 11 with one piece thereof, are fitted to the side edge faced to the opening part 13 through hinges 15a, 15b and respective melting furnace bodies 21a, 21b are tiltably supported at the inner surface side of the doors 16a, 16b. Further, a tundish 42 and a water-cooling rotating roll 44 as a casting device, are set on a shifting carriage 48 and travelled on a rail 44, and under the atmosphere, shifting cast units 411, 412 shiftable between the preparing chamber 31 and the melting and casting chamber 11, are disposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vacuum melting and casting apparatus for metals and alloys, and more particularly to a vacuum melting and casting apparatus having a high operation rate and excellent cost performance.

[0002]

2. Description of the Related Art Hitherto, in order to obtain a casting of a high-purity metal or an alloy having a homogeneous composition, a method of melting a metal under vacuum, cooling, and casting has been adopted.

(Conventional Example 1) FIG. 9 is a Japanese Patent Application Laid-Open No. Hei 5-23763.
FIG. 6 is a longitudinal sectional view schematically showing a vacuum melting casting apparatus 100 disclosed in Japanese Patent Publication No. 5 (JP-A-5). Vacuum melting casting device 100
In the vacuum chamber 101, the melting furnace body 102
03 and is tilted around the rotation shaft 104 by the hydraulic cylinder 105. Further, the melting furnace body 102 is connected to an external high-frequency power supply by a cable 107, and metals are melted by induction heating in a crucible in the melting furnace body 102. Melting furnace body 102
Below, a water-cooled disk-shaped rotary mold 118 having a removable mold 117 is driven by a motor 114 by a belt 116 via a speed reducer 115 as a casting device. Then, when the molten metal is formed in the melting furnace body 102, the melting furnace body 102 is tilted by the hydraulic cylinder 105, and the molten metal flows through the gutter 113 and the disk-shaped rotary mold 118.
The molten metal is poured out and cooled, and a thin disk-shaped casting obtained by cooling is taken out together with the mold 117.

(Conventional Example 2) FIG. 10 is a schematic longitudinal sectional view of a vacuum melting and casting apparatus 200 exemplified in Japanese Patent Application No. 11-177426 filed by the present applicant. In the vacuum melting and casting apparatus 200, an induction heating type melting furnace body 202 is supported by a column 203 in a vacuum chamber 201, and is tilted around a rotation shaft 204 by a hydraulic cylinder (not shown). . In addition, one tundish 206 constituting the casting apparatus is installed on a column 207 whose height can be adjusted, and the other water-cooled rotating roll 208 is supported by a support (not shown).
Similarly, the motor is rotated in a direction indicated by an arrow by a motor (not shown). That is, the tundish 206 and the rotating roll 208 are installed independently, so that the height position of the tundish 206 can be adjusted to adjust the distance between the pouring end 206t and the surface of the rotating roll 208. It has become. In addition, a scraper 209 is provided in contact with the downstream surface of the rotating roll 208, and strips the slab from the surface of the rotating roll 208. And the melting furnace body 20
When the molten metal is formed in 2, the melting furnace body 202 is tilted around the rotation axis 204 by the hydraulic cylinder, and the molten metal is quantitatively supplied to the tundish 206, and the molten metal is supplied from the tundish 206 to the surface of the rotating roll 208. And then cooled to produce a slab.

[0005]

In the vacuum melting and casting apparatus 100 of the prior art 1, since a melting furnace body 102 and a disc-shaped rotary mold 108 as a casting machine are in a one-to-one relationship in a vacuum chamber 101, the vacuum melting and casting apparatus 100 has a one-to-one relationship. After each casting, the vacuum chamber 101 is opened to the atmosphere and the casting is taken out of the disk-shaped rotary mold 118. In addition to cleaning the mold surface and, in some cases, repairing the mold, the idle time (play time) is required. Time), the operation rate of the vacuum melting casting apparatus 100 is lowered. Further, even when the casting is restarted, the vacuum chamber 101 is evacuated from the atmospheric pressure, so that evacuation takes time, which also increases the idle time and lowers the operation rate. The idle time is set in the vacuum chamber 201 by the melting furnace body 202, the tundish 206 of the casting equipment, and the rotating roll 208.
This also exists in the vacuum melting casting apparatus 200 of the second conventional example provided with the above.

In the conventional example 2, the distance between the pouring end 206t of the tundish 206 and the surface of the rotary roll 208 is an important factor that governs the cooling condition of the slab to be manufactured, and the allowable error of the distance. May be required to be 0.5 mm or less. Therefore, after repairing or replacing the tundish 206 and the rotating roll 208, the pouring end 206t of the tundish 206 and the rotating roll 20 are removed.
8 is carefully adjusted. However, after that, when the vacuum chamber 201 is evacuated, it is considered that the vacuum chamber 201 is slightly deformed and deformed.
The gap between the pouring end 206t and the surface of the rotating roll 208 may be outside the allowable error range and need to be readjusted.
This significantly reduces the operation rate of the vacuum melting casting apparatus 200.

The present invention has been made in view of the above-mentioned problems, and has a short idle time based on removal of slag adhered to a crucible, replacement of a crucible, or cleaning or replacement of casting equipment, and greatly improved the operation rate of vacuum melting casting. It is an object to provide a device.

[0008]

Means for Solving the Problems The above-mentioned object is achieved by the structure of claim 1. To explain the solution, the vacuum melting and casting apparatus of claim 1 comprises a metal melting furnace and a casting furnace. In a vacuum melting and casting apparatus provided with a device, a melting and casting chamber and a preparation room are provided adjacent to each other in the vacuum melting and casting apparatus, and one or two or more casting apparatuses are installed on a movable trolley. This is a device in which a mobile casting unit is movably disposed under the atmosphere and between a preparation room and a melting casting room. In such a vacuum melting and casting apparatus, when moving the moving casting unit under the atmosphere to the melting and casting chamber, the preparation chamber needs to be open to the atmosphere, but the melting and casting chamber does not need to be opened to the atmosphere, so that the temperature steadiness is low. Will be retained. In addition, the vacuum evacuation of the melting and casting chamber after the movable casting unit has been moved from the pre-evacuated preparation chamber to the melting and casting chamber is performed from a constant degree of vacuum, so that it can be completed in a short time. Further, since the casting machine is installed on the movable carriage, even if the movable casting unit subjected to maintenance under the atmosphere is moved to the melting casting chamber and evacuated, the spacing between the casting equipment does not change. In the case where two or more mobile casting units are provided, the second mobile casting unit which has been subjected to the maintenance in advance without waiting for the completion of the maintenance of the first mobile casting unit taken out of the atmosphere after the casting is completed. The mobile casting unit can be moved to the preparation room to start the next casting process.

A vacuum melting casting apparatus according to claim 2 is provided with two or more preparatory chambers adjacent to the melting casting chamber, and two or more mobile casting units are provided. When one of the preparation chambers is used to remove a mobile casting unit in the casting process from the melting and casting chamber, at least another one of the preparation chambers is on standby to move another mobile casting unit to the melting and casting chamber. It is a device used for. In such a vacuum melting and casting apparatus, the first mobile casting unit after casting is moved from the melting and casting chamber to one of the preparation chambers, and then is made to wait in at least another one of the preparation chambers. The second mobile casting unit can be moved to the melting casting chamber to start the casting process.

[0010] The vacuum melting and casting apparatus according to claim 3 is provided with two or more melting furnace bodies, and when one of the melting furnace bodies is in the melting and casting chamber, the melting furnace body is provided. At least another one is a device which is exchangeably waited outside the melting and casting room. In such a vacuum melting and casting apparatus, when one melting furnace body needs cleaning, repairing or replacement of the crucible, it can be replaced with another melting furnace body on standby to continue the casting process. Claim 4 dependent on claim 3
In the vacuum melting and casting apparatus, two doors each having a size capable of independently opening and closing the opening of the melting and casting chamber are attached to opposite side edges of the opening via hinges, respectively.
This is a device in which a melting furnace body is supported on the inner surface side of each of the doors. Such a vacuum melting casting apparatus, when one of the melting furnace body in the melting casting room requires maintenance,
Only by alternately opening and closing the two doors, the casting process can be continued by exchanging with other waiting furnace bodies.

A vacuum melting casting apparatus according to claim 5 which is dependent on claim 1 is an apparatus employing a combination of a tundish and a rotating roll or a disk-shaped rotating mold as casting equipment. Such a vacuum melting casting apparatus can cool the molten metal by a cooling surface whose temperature is constantly reduced provided by a rotating roll or a disk-shaped rotating mold.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment of Vacuum Melting Casting Apparatus of the Invention
The feature is that a melting casting chamber and a preparation chamber are provided adjacent to each other in a vacuum melting casting apparatus, and one or two or more mobile casting units in which casting equipment is installed on a mobile trolley are operated under atmospheric pressure and vacuum. It is provided so as to be movable between a preparation chamber and a melting and casting chamber in the melting and casting apparatus. FIG. 1 is a plan view showing a basic configuration of the vacuum melting casting apparatus of the present invention. That is, in the vacuum melting and casting apparatus 1, the preparation chamber 31 is adjacent to the melting and casting chamber 11 via the airtight internal door 12, and the preparation chamber 31 is isolated from the outside under the atmosphere by the airtight external door 32. Have been. A melting furnace body 21 is provided in the melting casting chamber 11 to melt metals. The melting casting chamber 11 and the preparation chamber 31 are independently evacuated. In addition, one mobile casting unit 41 in which casting equipment is installed on a mobile trolley is provided.

The mobile casting unit 41 which has been maintained in the atmosphere and indicated by a dashed line is opened to the outside door 32, moved to the preparation chamber 31 as indicated by the dashed line, closed, evacuated, and If there is, it is preheated. Next, the movable casting unit 41 is moved as shown by a solid line to the melting and casting chamber 11 where the inner door 12 is opened and the vacuum evacuation is already performed, and the inner door 12 is closed. And the melting casting room 11
Is evacuated to a predetermined degree of vacuum, and metals are melted in the melting furnace body 21. Subsequently, the mobile casting unit 41
The molten metal of the metal supplied from is cooled to produce a casting. During this time, the preparation chamber 31 is kept in a vacuum state. After the casting is completed, the movable casting unit 41 is moved backward from the melting casting chamber 11 to the atmosphere via the preparation chamber 31 and is maintained after removing the casting. The casting may be taken out in the melting and casting chamber 11.

In the vacuum melting and casting apparatus 1, the moving casting unit 41 under the atmosphere is moved to the melting and casting chamber 11 via the preparation chamber 31 to perform casting, and is returned to the atmosphere again. The preparation chamber 31 is opened to the atmosphere, but the melting and casting chamber 11 is not opened to the atmosphere.
Is easy to maintain the temperature steadiness including the melting furnace body 21 inside. After the movable casting unit 41 is moved from the preparation chamber 31 to the melting and casting chamber 11, the vacuum evacuation of the melting and casting chamber 11 is performed from a certain degree of vacuum, so that it is completed in a short time.

Although the above is a case where one mobile casting unit 41 is provided, two or more mobile casting units 41 may be provided for the vacuum melting casting apparatus 1. As shown in FIG. 2, after finishing melt casting chamber solid mobile casting unit 41 in 11 ₁ casting, through the preparatory chamber 31 as shown by a dashed line, it is moved by atmospheric as indicated by the two-dot chain line When it comes, and a replacement this, by evacuating by immediately moving the moving casting unit 41 ₂ of the solid line in advance the maintenance is completed under the atmosphere into the preparation chamber 31, preparation chamber 31 is open to the atmosphere Since the time can be shortened, the casting time in the melting and casting chamber 11 is lengthened by that time, and the vacuum melting and casting apparatus 1
Operation rate is improved.

Further, a preparation room adjacent to the melting and casting room 11
Preferably, two or more chambers 31 are provided. Figure 3 shows two rooms
FIG. 4 shows a vacuum melting and casting apparatus 2 having storage rooms 31 and 31 '.
FIG. Melt casting room 11 and adjacent preparation room 3
1, 31 'can be evacuated independently
It has become. Thus, the two preparation rooms 31, 31 '
In some cases, for example, one preparation chamber 31 is
Used to remove the mobile casting unit 41 in the casting process
And the other preparation room 31 ′ has another mobile casting unit 41.
It can be used for waiting to move to the melting and casting chamber 11.
That is, the solid line in the melting casting
Mobile casting unit 41₁ Is the preparation room 31 maintained in a vacuum
Is taken out into the atmosphere via the dashed line
However, one of the right
Mobile casting unit 41 shown by a chain line _Two As shown by the solid line
To the preparation room 31 ', and evacuate and pre-load if necessary.
The mobile casting unit 4
1₁ Is immediately taken out to the empty casting chamber 11
Mobile casting unit 41_Two Move to the casting process
Idle tie in the melting and casting room 11
And the operation rate of the vacuum melting and casting apparatus 2 is large.
Improve. And the mobile casting that was previously taken out into the atmosphere
Building unit 41₁ After the maintenance, the preparation room 31
Is returned to the standby state. Also mobile casting unit
41_Two The preparation room 31 ′ in which the
The vacuum is maintained as it is and the mobile casting unit after the casting is completed.
Knit 41_Two Used to retrieve The above is quasi
Take out the storage room 31 and the preparation room 31 'alternately between taking out and waiting
For example, take out the preparation room 31
And the preparation room 31 'can be used exclusively for standby
It is.

[0017] In the above case providing a preparation chamber 31 preparation chamber 31 'and the moving casting unit 41 ₁ that has been removed from the melting and casting chamber 11 is moved into the atmosphere via the preparation room 31, preparation chamber after being maintained Although the state is returned to the standby state, the idle moving time can be further reduced by providing the third mobile casting unit 41. That is, with reference to FIG.
If 1 ₁ is taken out to the atmosphere from the preparation chamber 31, without waiting for the completion of maintenance of the mobile casting units 41 _1, moves the moving casting unit 41 ₃ of the left which was subjected to pre-maintenance immediately into the preparation chamber 31 By evacuating the vacuum, the time during which the preparation chamber 31 is open to the atmosphere is shortened, and the casting time in the melting and casting chamber 11 can be lengthened by that time. Can be improved.

Further, in the vacuum melting and casting apparatus of the present invention, it is preferable that the melting and casting chamber 11 is provided with two or more melting furnace bodies 21. The case where there are two melting furnace bodies 21 will be described with reference to FIG. 3. Two doors 16 a and 16 b each having a size capable of independently opening and closing the opening 13 formed on the back surface of the melting casting chamber 11 are opened. 13 are attached to opposing side edges via hinges 15a and 15b, respectively, and melting furnace bodies 21a and 21b are supported on inner surfaces of the doors 16a and 16b, respectively. When the opening 13 of the melting and casting chamber 11 is closed by one of the doors 16a and the melting furnace body 21a is in a casting process, the other door 16b is opened and under the atmosphere, and the melting furnace body 21b is put into a crucible. Maintenance such as removal of the attached slag and repair of the crucible is performed to prepare for replacement with the melting furnace body 21a in the casting process. That is, when the melting furnace body 21a is solely used and the mobile casting unit 41 is always prepared, the time required for maintenance of the melting furnace body 21a is an idle time. Melting furnace body 21b
In the casting process, the idle time described above can be reduced and the operation rate of the vacuum melting casting apparatus 10 can be improved.

A second feature of the vacuum melting and casting apparatus of the present invention is that a mobile casting unit in which casting equipment is installed on a movable trolley is employed, and a preparation room and a melting and casting chamber in the vacuum melting and casting apparatus are used under the atmosphere. The point is that it is possible to move between them. The type of casting equipment is not limited as long as it can produce a casting by cooling a molten metal. Specific examples include a combination of a tundish and a water-cooled rotating roll, or a water-cooled disk-shaped rotating mold. The moving system of the mobile trolley may be of any type, and for example, may be run on a rail. In addition, the way of traveling may be self-propelled, or may be moved by another driving source. The supply of electric power and cooling water for rotating the rotating roll or the disk-shaped rotating mold can be performed, for example, by connecting a power supply end provided in the preparation room and a water supply end to the movable casting unit with a flexible supply cable. It goes without saying that the power supply end and the water supply end may be installed in places other than the preparation room.

In the casting equipment, maintenance such as removal and replacement of slag on the casting surface is performed in the atmosphere. When the casting machine is a combination of a tundish and a rotating roll, the distance between the pouring end of the tundish and the rotating roll is a large factor that determines the cooling condition, and is 0.5 mm.
The following tolerance may be required: As in Conventional Example 2, a vacuum melting and casting apparatus 200 in which a tundish 206 and a rotating roll 208 are independently installed in a vacuum chamber 201.
Then, in the vacuum chamber 201 opened to the atmosphere, the tundish 2
When the vacuum chamber 101 is evacuated even if the distance between the pouring end 206t of No. 06 and the surface of the rotary roll 208 is adjusted to a predetermined value, a slight distortion deformation occurs on the floor surface, wall, and ceiling of the vacuum chamber 101. Because of this, the adjusted interval may be out of the allowable range, which significantly lowers the operation rate, such as stopping pouring and re-adjusting the interval. However, as in the present invention, the tundish and rotation When the roll and the roll are installed on the same moving trolley, the gap between the tundish and the rotating roll is adjusted in the atmosphere, and then moved to the preparation room or melting and casting room to evacuate, but the adjusted interval fluctuates. There is a great merit of not doing it.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a vacuum melting and casting apparatus according to the present invention will be described in detail with reference to the drawings. That is,
FIG. 4 is a partially cutaway front view showing a melting casting chamber 11 and one preparation chamber 31 of a vacuum melting casting apparatus 10 as a specific example of the vacuum melting casting apparatus 2 shown in FIG. 3, and FIG. It is a corresponding partially broken plan view. In FIGS. 4 and 5, only the end of the other preparation room 31 ′ is shown, but as described in FIG. 3, the preparation room 31 and the preparation room 31 ′ are equivalent. The melting chamber 11, the preparation chamber 31, and the preparation chamber 31 ′ are connected to a vacuum pump (not shown), and are independently evacuated.
FIG. 6 is a cross-sectional view taken along the line [6]-[6] in FIG. 5, and is partially omitted.

Referring to FIGS. 4 and 5, a preparation chamber 31 is adjacent to the melting and casting chamber 11 through an airtight internal door 12 which is opened and closed in the vertical direction. Airtight external door 3 which is different but is also opened and closed in the vertical direction
2 shields the atmosphere from the outside. Although not shown, a supply section of the raw metal is provided on the ceiling of the melting and casting chamber 11. Referring to FIG. 5, doors 16a and 16b are attached to opposing side edges of opening 13 formed on the back surface of molten casting chamber 11, respectively.
6a, the melting furnace body 21a on the inner surface side of the door 16b,
The melting furnace body 21b is supported. As shown in FIG. 7, which will be described later, the door 16a and the door 16b are opened and closed to open the melting furnace body 21.
a and 21b are exchanged. FIG. 5 shows that the opening 13 of the melting and casting chamber 11 is closed by the door 16b, the melting furnace body 21b is present in the melting chamber 11, and the melting furnace body 21a is opened.
6a together with 6a indicates a standby state under the atmosphere.

FIG. 7 is a plan view showing opening and closing of the doors 16a and 16b. Opening 1 formed on the back of melting chamber 11
3, two doors 16a, 16b each having a size that can be opened and closed independently are attached via hinges 15a, 15b to the opposing side edges, and the melting furnace body 21a, The melting furnace body 21b is supported on the inner surface side of the door 16b. FIG. 7 shows that the opening 13 of the melting and casting chamber 11 is closed by the one door 16a, and the melting furnace body 21a is closed.
Is in the casting process, the other door 16b is open and under the atmosphere, and the melting furnace body 21b is in a standby state in preparation for replacement with the melting furnace body 21a in the casting process. Then, slag adheres to the crucible 22 of the melting furnace body 21a in the melting process in the melting casting chamber 11,
When a defect occurs, the door 16a is opened and the melting furnace body 21a is taken out to the atmosphere as shown by a dashed line, and the other door 16b is closed for replacement, and the melting furnace body 21b is positioned in the melting casting chamber 11. By doing so, the casting operation is continued. The melting furnace body 21a taken out in the atmosphere is put into a standby state after maintenance such as removal of slag and repair or replacement of the crucible is performed.

Since the melting furnace body 21a and the melting furnace body 21b supported by the door 16a and the door 16b are the same, the following description will be made with the subscripts a and b removed. Referring to FIG. 6, melting furnace body 21 having crucible 22 therein and having cable 21 </ b> C for induction heating is supported by frame-shaped pedestal 20 integral with lid 16. That is, with reference to FIG. 5, the melting furnace body 21 has a support member 23 and a distal end portion of the support leg 24 extending laterally, a guide member 26 fixed on a frame-shaped pedestal 20 shown in FIG.
The roller 29 is wound up by a wire 28 which is inserted into and supported by an arc-shaped guide hole 26h and a guide hole 27h which is simplified in the drawing, and which is locked in the retaining hole 25 on the bottom surface of the melting furnace body 21. By winding up, the insertion ends of the support legs 23 and 24 of the melting furnace body 21 become guide holes 26h and guide holes 27h.
The inside of the furnace is slid, and the melting furnace body 21 is tilted as shown by a dashed line to discharge the molten metal.

Further, the mobile casting unit 41 ₁ of the 2 groups in the vacuum melt casting apparatus 10, 41 ₂ but is deployed, illustrating the movement casting unit 41 Remove the subscripts _{1, 2,} 6 Then, the mobile casting unit 41 is
A tundish 42 is supported on a support column 43 fixed on a fixed plate 48p of a movable carriage 48 provided with w such that the height position thereof can be adjusted, and a rotating roll 44 is mounted on a support 45 also fixed on the fixed plate 48p. It is pivoted. Referring to FIGS. 4 and 5, the mobile casting unit 41 extends from under the atmosphere, through the preparation chamber 31 of the vacuum melting and casting apparatus 10 to the melting and casting chamber 11, except for the external door 32 and the internal door 12. It is moved on the laid rail 49. Then, the moving casting unit 41 is moved into the melting casting chamber 11, and the rotating roll 44 is driven by a belt by a motor 46, rotates in the direction indicated by the arrow in FIG. 6, and is supplied through the tundish 42. To cool. The slab scattered from the rotating roll 44 collides with the barrier 47 fixed to the moving carriage 48 and falls. The obtained slab is taken out from the circular opening 19 shown by the dashed line in FIG.

The melting chamber 1 of the vacuum melting casting apparatus 10 described above.
FIG. 8 shows an example of a time table showing the interrelationship between the operations of the mobile casting units 41 ₁ , 41 ₂ and the preparation chambers 31, 31 ′ on both sides thereof. That is, in FIG.
1 and the operation to be performed on the melting casting chamber 14 and the operation to be performed, the lower horizontal enclosure is one of the moving casting units 41 _1.
Time course for the operation, the upper horizontal enclosure is a time table showing the time course and operation of the other moving casting unit 41 _2, shows the time scale as an example under the oblong enclosure central portion I have.

In FIG. 8, the movable casting unit shown on the lower side is shown.
To 41₁ Is moved from the atmosphere to the preparation room 31, and the external door 3
2 is closed, the preparation chamber 31 is evacuated, and
Knit 41₁ Pre-heated tundish 42
Lugon gas is introduced. Meanwhile, the dissolution shown in the center
The casting chamber 11 is closed by a lid 16b provided with a melting furnace body 21b.
The back opening 13 is closed and the inner doors 12, 12 'are closed
The crucible 22 of the melting furnace body 21b has a predetermined amount of raw material.
The charging furnace is charged, and the furnace is evacuated to a predetermined degree of vacuum.
21b is induction-heated, and the first melting is performed. Reserve
Mobile casting unit 41 after heating₁ Is the internal door 12
It is opened and moved to the melting and casting chamber 11, where it is melted.
Since argon gas is introduced into the thawing chamber 11,
The preparation chamber 31 and the melting and casting chamber 11 are in an argon atmosphere at the same pressure.
I am worried. Mobile casting unit 41 ₁ Is fixed
And the inside door 12 is closed and tundish
42 is fully heated. And when it reaches a certain temperature,
As shown in FIG. 6, the melting furnace body 21 is tilted to
Molten metal moves from casting unit 41₁ Tundish
Hot water is quantitatively supplied to the tundish 42.
And spread evenly on the surface of the water-cooled rotating roll 44 to cool
Then, a slab is manufactured.

When the casting is completed, the inner door 12 is opened,
The mobile casting unit 41 ₁ is connected from the melting casting room 11 to the preparation room 3
1, the inner door 12 is closed, the outer door 32 of the preparation chamber 31 is opened, and the movable casting unit 41 ₁ is moved to the atmosphere.
4 is subjected to maintenance, and the intervals between them are adjusted. On the other hand, a predetermined amount of raw material metal is supplied to the melting furnace body 21b after the tapping is completed, the metal is evacuated to a predetermined degree of vacuum, the melting furnace body 21b is induction-heated, and the second melting is performed. Thus, the fourth melting and tapping are performed.

The mobile casting unit 41 ₂ shown on the upper side, based on a certain time lag, the operation by the same time as moving the casting unit 41 ₁ is performed. That is, as shown in FIG. 8, tapping from that time delay for tapping of the furnace body 21b dissolution of second is completed, move the casting unit 41 ₂ is moved in the melting and casting chamber 11 melting furnace body 21b When the mobile casting unit 41 ₁ is in the stage of the main heating of the tundish 42 in the melting casting chamber 11, the mobile casting unit 41 ₂ is moved to the preparation chamber 31 ′ so that casting can be performed. for 41 ₁ and is carried out similar operations, after the cast receives a second tapping from the melting furnace body 21b, the tundish 42 is moved into the atmosphere,
The maintenance of the rotating roll 44 is performed. Also, when the mobile casting unit 41 ₂ is in the stage of main heating of the tundish 42 in the melting casting chamber 11, the lower mobile casting unit 41 ₁ , which has already been maintained, is moved to the preparation chamber 31 as before. And the melting furnace 2
Casting is performed after the third tapping from 1b. Subsequently, the upper movable casting unit 41 ₂ , which has already been maintained, is moved to the preparation room 31 ′ so that casting can be performed by receiving the fourth hot water from the melting furnace body 21 b, and the preparation room 31 ′ is performed. Is evacuated, and casting is performed in the same manner after receiving the fourth tapping. Mobile casting unit 4
The space between the first and _second oblong enclosures of ₁₁ and mobile casting unit 41 ₂ is the mobile casting unit 41
_1, indicating that not performed well operation whatever the 41 _2.

For example, after the fourth tapping, the melting furnace body 21b at the center is subjected to cleaning including removal of slag attached to the crucible 22, and maintenance such as replacement in some cases. That is, after waiting for the temperature of the melting furnace body 21b to decrease, the argon gas present in the melting casting chamber 11 is evacuated,
Then, after introducing the atmosphere to completely set the melting and casting chamber 11 in an air atmosphere, the door 16b is opened to open the melting furnace body 2.
1b is taken out to the atmosphere and maintenance is performed.
On the other hand, replacing the opened door 16b, the previously opened door 16a is closed, and the preheating furnace 21a that has been preheated is set in the melting casting chamber 11.
When the maintenance of the melting furnace body 21b is simple and can be completed in a short time, the melting furnace body 21b may be reused. In any case, the melting and tapping of the metal in the melting and casting chamber 11 is resumed.

As described above, the vacuum melting and casting apparatus according to the embodiment of the present invention is configured and operates as described above. However, the present invention is not limited to these, and of course, various modifications are possible based on the technical idea of the present invention. Is possible.

For example, in this embodiment, the melting casting chamber 1
Although two preparation chambers 31 and 31 ′ are provided adjacent to both side surfaces of one, one chamber may be adjacent to the side and the other one may be adjacent to the front, and the melting and casting chamber 11 and the preparation chamber 31, The arrangement of 31 'is not particularly limited. Alternatively, a preparation room 31 "may be provided to provide three rooms.

In the present embodiment, a tundish 42 and a rotating roll 44 capable of rapidly cooling molten metal are used as casting equipment.
Was adopted, but the disk-shaped rotary mold shown in Conventional Example 1 may be used instead. In addition, when quenching of the molten metal is not required, the molten metal may be directly poured into a mold having no rotating mechanism. In short, in the vacuum melting casting apparatus of the present invention, the type of the mold is not limited.

In the present embodiment, the preheating is performed in the preparation chamber 31 and the main heating is performed in the melting and casting chamber 11. This is because the tundish 42 needs to be heated. It is needless to say that the preheating and the main heating may be omitted in the case of the apparatus employing the casting equipment which does not use the casting equipment. In this embodiment, the lids 16a, 16
Although the melting furnace bodies 21a and 21b were replaced by opening and closing b, the replacement of the melting furnace bodies 21a and 21b may be performed by other methods, or three or more melting furnace bodies may be used. In the present embodiment, the prechamber 31 and the melting and casting chamber 11 are set in an atmosphere of arcon gas, but the introduction of argon gas may be omitted depending on the type of metal to be cast.

[0035]

The vacuum melting and casting apparatus of the present invention is embodied in the form described above, and has the following effects.

According to the first aspect of the present invention, the movable casting unit is moved from the preparation chamber to the melting casting chamber in the melting casting chamber and the preparation chamber provided adjacent to each other in the vacuum melting casting apparatus. Requires that the preparation room be opened to the atmosphere and evacuated, but the melting and casting room does not need to be opened to the atmosphere, maintaining temperature stability and moving the mobile casting unit from the preparation room to the melting and casting room The evacuation of the molten casting chamber to a predetermined degree of vacuum after the evacuation is performed in a short time because the evacuation is performed from a constant degree of vacuum, and since the casting equipment is installed on a movable carriage, the movable casting unit is placed under the atmosphere. Even if it is moved to the melting casting chamber and evacuated to a predetermined degree of vacuum, there is no change in the spacing between the casting equipment, the melting casting of metals is streamlined as a whole, and the operation rate of the vacuum melting casting apparatus is greatly improved. . In the case where two or more mobile casting units are provided, the second mobile casting unit which has been subjected to the maintenance without having to wait for the completion of the maintenance of the first mobile casting unit which has been cast and taken out in the atmosphere. Can move the casting unit to the preparation room and start the next casting, so the time during which the preparation room is open to the atmosphere is shortened, and the idle time in the melting and casting room can be reduced by that time. Improve the operation rate of vacuum melting casting equipment.

According to the vacuum melting and casting apparatus of the present invention, two or more preparation chambers are adjacent to the melting and casting chamber and two or more mobile casting units are provided. After removing the first mobile casting unit from the melting and casting room into one preparatory room, the second mobile casting unit waiting in the other preparatory room is moved to the empty melting and casting room. As a result, the casting can be continued, the idle time in the melting and casting chamber is reduced, and the operation rate of the vacuum melting and casting apparatus is improved. Further, when the second mobile casting unit is in the melting casting room, the maintenance of the first mobile casting unit can be performed, and idle time based on the maintenance of the casting equipment is not generated.

According to the vacuum melting and casting apparatus of claim 3, 2
Since one or more melting furnace bodies are provided, and one melting furnace body is in the melting and casting chamber, the other melting furnace body is outside the melting and casting chamber and is exchangeably on standby, so one melting furnace body is provided. If your body needs maintenance such as cleaning, repair, or replacement,
The melting and casting can be continued by replacing the other melting furnace body in a standby state, and the idle time in the melting and casting chamber is reduced to improve the operation rate of the vacuum melting and casting apparatus.

According to the vacuum melting and casting apparatus of the present invention, the melting furnace body is replaced by simply opening and closing two doors attached to both sides of the opening of the melting and casting chamber through hinges alternately. It is possible to replace the melting furnace body requiring maintenance with another waiting furnace body in a short time and continue melting and casting, reducing the idle time in the melting chamber and vacuum melting casting. Improve equipment availability.

According to the vacuum melting casting apparatus of the fifth aspect, a combination of a tundish and a rotating roll is used for a casting machine,
Alternatively, since the disk-shaped rotary mold is employed, the molten metal is cooled on the cooling surface whose temperature is constantly lowered, and a highly uniform casting is provided.

[Brief description of the drawings]

FIG. 1 is a plan view when one mobile casting unit is provided in a vacuum melting casting apparatus in which a preparation chamber is adjacent to a melting casting chamber.

FIG. 2 is a plan view showing a case where two mobile casting units are provided in the apparatus.

FIG. 3 is a plan view showing a case where two or three mobile casting units are provided in a vacuum melting casting apparatus provided with two preparation chambers adjacent to the melting casting chamber.

FIG. 4 is a partially broken front view showing a left portion of the vacuum melting and casting apparatus of the embodiment.

FIG. 5 is a partially broken plan view corresponding to FIG. 4;

6 is a sectional view taken along line [6]-[6] in FIG.

FIG. 7 is a partially broken plan view showing opening and closing of two lids attached to an opening of a melting and casting chamber of the vacuum melting and casting apparatus of the embodiment.

FIG. 8 is a time table showing an interrelationship between operations in a melting furnace body, a melting casting room, and two movable casting units provided in the embodiment.

FIG. 9 is a cross-sectional view of a vacuum melting casting apparatus of Conventional Example 1.

FIG. 10 is a sectional view of a vacuum melting and casting apparatus of Conventional Example 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum melting casting apparatus 2 Vacuum melting casting apparatus 10 Vacuum melting casting apparatus 11 Melting casting room 13 Opening 15 Hinge 16 Lid 21 Melting furnace body 22 Crucible 31 Preparation room 41 Moving casting unit 42 Tundish 44 Rotating roll 48 Moving table 49 Rail

Claims (5)

[Claims] 1. A vacuum melting and casting apparatus comprising a metal melting furnace body and a casting machine, wherein a melting and casting chamber and a preparation chamber are provided adjacent to each other in the vacuum melting and casting apparatus. Wherein one or two or more mobile casting units, each of which is installed on a mobile trolley, are provided so as to be movable under the atmosphere and between the preparation chamber and the melting and casting chamber. 2. The method according to claim 1, wherein two or more of the preparatory chambers are provided adjacent to the melting and casting chamber, and two or more of the mobile casting units are provided. One of the preparatory chambers is in a casting process. Claims: At least one other of the preparation chambers is used for waiting to move another mobile casting unit to the melting casting chamber when used to remove the mobile casting unit from the melting casting chamber. Item 7. A vacuum melting casting apparatus according to Item 1. 3. A melting furnace body comprising at least two melting furnace bodies, wherein when one of the melting furnace bodies is in the melting casting chamber, at least another of the melting furnace bodies is outside the melting casting chamber. The vacuum melting and casting apparatus according to claim 1 or 2, wherein the vacuum melting and casting apparatus is set in a standby state so as to be exchangeable. 4. Two doors, each having a size capable of independently opening and closing the opening of the melting and casting chamber, are attached to opposite side edges of the opening via hinges, respectively, and the two doors are provided. The vacuum melting casting apparatus according to claim 3, wherein the melting furnace body is supported on each inner surface side. 5. The vacuum melting casting apparatus according to claim 1, wherein a combination of a tundish and a rotating roll or a disk-shaped rotating mold is adopted as the casting device.