JP2001071111A - Casting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity by facilitating the attachment/detachment of a sucking-up tube to/from an injection sleeve. SOLUTION: In this casting apparatus, the injection sleeve 4 communicated with a die cavity, a molten metal holding furnace 5 for holding the molten metal Me and a sucking-up tube 6 for sucking and transferring the molten metal Me into the injection sleeve 4 with the vacuum-suction in the injection sleeve 4 by connecting its one end to the injection sleeve 4 freely attachably/ detachably and dipping the another end into the molten metal holding furnace 5. Further, at the molten metal holding furnace 5 side, a tube supporting mechanism 10 by which the one end is attached/detached to/from the injection sleeve 4 by making the sucking-up tube 6 nearer to or away from the injection sleeve 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of sucking molten metal in a molten metal holding furnace into an injection sleeve by vacuum suction in the injection sleeve, filling the molten metal into a mold cavity at a high speed and a high pressure to mold a casting. The present invention relates to a casting device to be manufactured.

[0002]

2. Description of the Related Art Conventionally, as the above-mentioned casting apparatus, for example, there has been one shown in FIG.

[0003] As shown in FIG.
An injection sleeve 53 fixed to a fixed mold 51 via a platen 52 and communicating with a mold cavity (not shown), a liftable molten metal holding furnace 54 containing molten metal M, and one end via a hanger 55 A suction pipe 5 detachably connected to the injection sleeve 53 and having the other end immersed in the molten metal M in the molten metal holding furnace 54 and sucking and transferring the molten metal M to the injection sleeve 53 by vacuum suction in the injection sleeve 53.
6 and a heating element 57 fitted to the suction pipe 56. In the casting apparatus 50, when removing the suction pipe 56, the molten metal holding furnace 54 is lowered to the retracted position, the heating body 57 is removed from the suction pipe 56, and the hanging member 55 is removed. Of the suction pipe 56 provided in the injection sleeve 53 by loosening the adjusting screw 58 of the suction pipe 56.
After being separated from one end, it is moved along the injection sleeve 53 together with the hanger 55 to remove it.

[0004]

However, in the above-described conventional casting apparatus 50, when the suction pipe 56 is attached to or detached from the injection sleeve 53, the work of moving the suction pipe 56 along with the hanging member 55 along the injection sleeve 53, It is necessary to operate the adjusting screw 58. In particular, when connecting the suction pipe 56 to the injection sleeve 53,
Since the screwing operation of the adjusting screw 58 must be performed while aligning the position of one end of the suction pipe 56 with the communication hole 53a of the injection sleeve 53, there is a problem that a hand gap is applied and the productivity may be adversely affected. Yes,
Resolving this problem has been a conventional problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and makes it possible to easily attach and detach the suction pipe to and from the injection sleeve, thereby realizing an improvement in productivity. The aim is to provide a casting device that is possible.

[0006]

According to the first aspect of the present invention, there is provided an injection sleeve communicating with a mold cavity;
A molten metal holding furnace containing molten metal, one end is detachably connected to the injection sleeve and the other end is immersed in the molten metal in the molten metal holding furnace, and the molten metal is made into the injection sleeve by vacuum suction in the injection sleeve. In a casting apparatus having a suction pipe for sucking and transferring, the suction pipe is arranged on the molten metal holding furnace side, and one end of the suction pipe is supported so as to be able to approach and separate from the injection sleeve so as to be detachable from the injection sleeve. The casting apparatus is characterized in that it is a means for solving the above-mentioned conventional problems.

According to a second aspect of the present invention, there is provided an injection sleeve communicating with a mold cavity, a molten metal holding furnace containing a molten metal, one end of which is detachably connected to the injection sleeve and the other end of which is melted. In a casting apparatus provided with a suction pipe for immersing the molten metal in the metal holding furnace and sucking and transferring the molten metal to the injection sleeve by vacuum suction in the injection sleeve, the molten metal holding furnace side sucks up the injection sleeve. A structure is provided in which a tube support mechanism is provided for moving the tube closer to and away from the injection sleeve at one end, and the structure of this casting apparatus is a means for solving the above-mentioned conventional problems.

A casting apparatus according to a third aspect of the present invention has a configuration in which a suction pipe is slidably penetrated to cover a molten metal holding furnace with a holding furnace lid, and the casting apparatus according to a fourth aspect of the present invention. The pipe support mechanism includes a rod body having one end connected to a suction pipe, a rod support body rotatably supporting an intermediate portion of the rod body around a support shaft orthogonal to the rod body, and a rod body at the other end of the rod body. The casting apparatus according to the fifth aspect of the present invention is configured to have a weight that can be detachably mounted, and is capable of injecting an inert gas or a low-active gas into a holding furnace lid and that is capable of injecting a molten metal into the holding furnace. In addition to providing a gas inlet / exhaust port capable of sucking air, a configuration in which a holding furnace pressure adjusting unit that discharges surplus gas in the molten metal holding furnace during gas injection and maintains a closed state of the molten metal holding furnace during air suction is provided. I have.

In a casting apparatus according to a sixth aspect of the present invention, a cover member surrounding one end of the suction pipe is provided on the injection sleeve, and a seal member is provided between the cover body and one end of the suction pipe. Is provided with a suction port for sucking air in a space surrounded by the injection sleeve, the cover body, and the seal member. The casting apparatus according to claim 7 of the present invention comprises the injection sleeve, the cover body, and the seal member. The degree of vacuum in the enclosed space is set to be equal to or lower than the degree of vacuum in the mold cavity in absolute pressure.

In the casting apparatus according to claim 8 of the present invention, when the injection tip sliding in the injection sleeve closes the communication hole with the suction pipe, the molten metal is sucked and transferred by vacuum suction in the injection sleeve. A control mechanism for stopping suction of air in a space surrounded by the injection sleeve, the cover body, and the seal member, which is started at the same time, is provided;
In the casting apparatus according to the ninth aspect of the present invention, the control mechanism is configured to control the detected part provided on the injection tip and the detected part provided on the injection sleeve in a state where the injection tip closes a communication hole with the suction pipe. The system includes a sensor to be detected, and a control unit that stops suction of air in a space surrounded by the injection sleeve, the cover body, and the seal member by an electric signal from the sensor.

[0011]

In the casting apparatus according to the first and second aspects of the present invention, when the suction pipe is attached to or detached from the injection sleeve, the suction pipe supported on the molten metal holding furnace side is merely moved close to or away from the injection sleeve, and the suction is performed. Since one end of the pipe is attached to and detached from the injection sleeve, the conventional operation of moving the suction pipe along the injection sleeve and the operation of the adjustment screw, especially the troublesome position of one end of the suction pipe and the injection sleeve The screwing operation of the adjusting screw performed while matching with the communication hole of the above becomes unnecessary.

That is, the productivity can be improved by the simple attachment and detachment of the suction tube to and from the injection sleeve.

In the casting apparatus according to claim 3 of the present invention,
With the above-described configuration, the suction pipe is kept warm by the heat of the molten metal in the molten metal holding furnace. As a result, it is not necessary to separately provide a heating element in the suction pipe, and energy consumption can be reduced. Will be done.

In the casting apparatus according to the fourth aspect of the present invention, since the above construction is employed, the operation of moving the suction pipe toward and away from the injection sleeve is performed according to the principle of leverage. The attachment / detachment of the injection sleeve is extremely easy, and the connection between the injection sleeve and the suction pipe is prevented from being damaged. In addition, at the time of connection, one end of the suction pipe is connected to the injection sleeve by the weight of the weight. Therefore, pressure leakage from the connection between the injection sleeve and the suction pipe is prevented.

In the casting apparatus according to claim 5 of the present invention,
Due to the above-described configuration, when an inert gas or a low-active gas is injected into the molten metal holding furnace from the inlet / outlet of the holding furnace lid, oxidation of the molten metal is prevented. Since the excess gas in the molten metal holding furnace is exhausted by the pressure adjusting unit, an increase in the internal pressure of the molten metal holding furnace is avoided, and the molten metal is prevented from going up the suction pipe.

On the other hand, when the air in the molten metal holding furnace is sucked from the inlet / exhaust port of the holding furnace lid, the closed state of the molten metal holding furnace is maintained by the pressure adjusting unit in the holding furnace. , The unnecessary gas such as hydrogen gas in the molten metal is removed.

In the casting apparatus according to the sixth aspect of the present invention, when the air in the space surrounded by the injection sleeve, the cover body, and the seal member is sucked through the suction port of the cover body, the injection sleeve is sucked up. The inflow of air from the connection portion with the pipe can be suppressed to a small extent, and the incidence of defects such as cavities decreases, and at this time, a small space formed around one end of the suction pipe connected to the injection sleeve The airtightness between the cover body and the injection sleeve and the airtightness of the sealing member may be insufficient compared with the airtightness of the mold cavity. Since one end of the tube does not require precision polishing, inexpensive consumables can be used.

[0018] In the casting apparatus according to the seventh aspect of the present invention, because of the above-mentioned configuration, it is possible to completely prevent air from flowing in from the connecting portion between the injection sleeve and the suction pipe, so that the casting cavity No defects are generated, and the air flow from the injection sleeve to the mold cavity disappears due to the inflow of air from the connection part, so that the injection sleeve is completely filled with the molten metal. Also, the leading molten metal does not flow into the mold cavity before, so that the occurrence of a molten metal boundary and segregation is avoided.

In the casting apparatus according to the eighth and ninth aspects of the present invention, because of the above-described configuration, the injection tip slides inside the injection sleeve before the injection tip completely closes the communication hole with the suction pipe. Inflow of air from the connection between the sleeve and the suction pipe is prevented, but after the injection tip that slides in the injection sleeve passes through the communication hole with the suction pipe, the molten metal flows back to the suction pipe side. Will be avoided.

[0020]

According to the casting apparatus according to the first and second aspects of the present invention, the suction pipe can be easily attached to and detached from the injection sleeve because of the above-described configuration, and therefore, the productivity is greatly increased. A remarkably excellent effect of being able to be improved is brought about.

[0021] In the casting apparatus according to claim 3 of the present invention,
With the above-described configuration, it is not necessary to separately provide a heating element on the suction pipe, and accordingly, a remarkably excellent effect that reduction in equipment cost and energy consumption can be realized is brought about.

In the casting apparatus according to the fourth aspect of the present invention, the above-described configuration provides the same effects as those of the casting apparatuses according to the first and second aspects, and furthermore, damage to the connecting portion between the injection sleeve and the suction pipe. It is possible to prevent the occurrence of pressure and to prevent pressure leakage from the connection portion between the injection sleeve and the suction pipe during connection.

In the casting apparatus according to claim 5 of the present invention,
With the above-described configuration, it is possible to prevent the oxidation of the molten metal and to prevent the molten metal from going up the suction pipe at the time of gas injection. An extremely excellent effect that unnecessary gas such as hydrogen gas in the inside can be removed is brought about.

In the casting apparatus according to claim 6 of the present invention,
With the above-described configuration, a remarkably excellent effect is obtained in that inexpensive consumables can be used and the occurrence of defects such as cavities can be suppressed.

[0025] In the casting apparatus according to claim 7 of the present invention, since the above-described configuration is employed, defects such as casting cavities can be eliminated at all, and in addition, the occurrence of hot boundaries and segregation in the mold cavity can be prevented. A remarkably superior effect is obtained that can be prevented.

In the casting apparatus according to the eighth and ninth aspects of the present invention, since the above construction is adopted, it is possible to prevent air from flowing from the connecting portion between the injection sleeve and the suction pipe, and to set the molten metal on the suction pipe side. This has a remarkably excellent effect that it is possible to prevent the backflow of water.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of a casting apparatus according to the present invention.

As shown in FIG. 1, the casting apparatus 1 includes an injection sleeve 4 which is fixed to a fixed mold 2 via a platen 3 and communicates with a mold cavity (not shown), and which can move up and down containing molten metal Me. One end (the upper end in the figure) is detachably connected to the injection sleeve 4 and the other end (the lower end in the illustration) is immersed in the molten metal Me in the molten metal holding furnace 5 and Molten metal by vacuum suction
suction pipe 6 for sucking and transferring e to the injection sleeve 4
And a holding furnace lid 7 which covers the molten metal holding furnace 5 and through which a suction pipe 6 is slidably penetrated, and a suction pipe 6 provided on the molten metal holding furnace 5 side so that the suction pipe 6 approaches and separates from the injection sleeve 4. Tube support mechanism 10 with one end attached to and detached from injection sleeve 4
It has.

The tube support mechanism 10 includes a rod 11 having one end (left end in the drawing) connected to one end of a suction pipe 6 projecting from the holding furnace lid 7, and a shaft provided at an intermediate portion of the rod 11. A rod support 13 that supports the support shaft 12 in a direction perpendicular to the direction and allows the rod 11 to rotate around the support shaft 12, and is detachable from the other end (the right end in the drawing) of the rod 11. The rod support 13 is fixed to the upper surface of the holding furnace lid 7.

In this case, an inert gas or a low-active gas such as an argon gas or a nitrogen gas can be injected into the molten metal holding furnace 5 and the air in the molten metal holding furnace 5 can be sucked into the holding furnace lid 7. And an exhaust port 7a is provided to discharge the excess gas in the molten metal holding furnace 5 when the gas is injected and to maintain the sealed state of the molten metal holding furnace 5 when sucking the air in the molten metal holding furnace 5. A holding furnace pressure adjusting unit is provided.

In this embodiment, the holding furnace pressure adjusting section includes a ring-shaped tube support 11 a provided at one end of the suction pipe 6 and connected to the rod 11, and a suction pipe provided on the holding furnace lid 7. 1 and a tube insertion hole 7b through which the suction tube 6 is connected at one end to the communication hole 4a of the injection sleeve 4, as shown in FIG. The pipe support 11a is separated from the suction pipe 6 and the gap S between the suction pipe 6 and the pipe insertion hole 7b.
L, the interior of the molten metal holding furnace 5 is opened to the atmosphere, and one end of the suction pipe 6 is connected to the injection sleeve 4 as shown in FIG.
When the air is sucked in a state of being separated from the communication hole 4a, the pipe support 11a is brought into contact with the holding furnace lid 7 to close the gap SL between the suction pipe 6 and the pipe insertion hole 7b. The closed state of the molten metal holding furnace 5 is maintained.

In the casting apparatus 1, in the state shown in FIG. 2, one end of the suction pipe 6 is connected to the communication hole 4 of the injection sleeve 4.
a, the weight 14 of the tube support mechanism 10 is connected to the rod 11
And the molten metal holding furnace 5 is raised to a certain height to approach the injection sleeve 4.

Next, the rod 11 of the tube supporting mechanism 10 is
After turning one end of the suction pipe 6 into the communication hole 4 a of the injection sleeve 4 by rotating the suction pipe 6 clockwise around the center 2,
A weight 14 is attached to the other end of the rod 11 and one end of the suction pipe 6 is pressed against the communication hole 4a of the injection sleeve 4 with a constant pressure to bring the state shown in FIG. .

At this time, since the operation of bringing one end of the suction pipe 6 close to the injection sleeve 4 is performed according to the principle of leverage, the connection of the suction pipe 6 to the injection sleeve 4 is extremely simple, and the connection between the injection sleeve 4 and the injection sleeve 4 is extremely simple. It is possible to prevent the connection portion with the suction pipe 6 from being damaged. In addition, the weight of the weight 14 causes one end of the suction pipe 6 to be in close contact with the communication hole 4 a of the injection sleeve 4. 6 is prevented from leaking from the connection portion with the pressure sensor 6.

When one end of the suction pipe 6 is connected to the communication hole 4a of the injection sleeve 4 as described above, an inert gas such as argon gas or nitrogen gas or an inert gas such as nitrogen gas is supplied from the inlet / outlet port 7a of the holding furnace cover 7. When the low-active gas is injected, the oxidation of the molten metal Me is prevented. At this time, the pipe support 11a is separated from the holding furnace lid 7, and the gap between the suction pipe 6 and the pipe insertion hole 7b is formed. Since the inside of the molten metal holding furnace 5 is open to the atmosphere through the SL, surplus gas in the molten metal holding furnace 5 is discharged from the gap SL, so that the internal pressure of the molten metal holding furnace 5 is prevented from rising and sucked up. This will prevent the molten metal Me from going up the tube 6.

On the other hand, when one end of the suction pipe 6 is to be detached from the communication hole 4a of the injection sleeve 4, the weight 14 is removed from the other end of the rod 11, and the rod 11 of the pipe support mechanism 10 is centered on the support shaft 12. After rotating one end of the suction pipe 6 from the communication hole 4a of the injection sleeve 4 and lowering the molten metal holding furnace 5, the connection of the suction pipe 6 is completed. In this case also, since the operation of separating one end of the suction pipe 6 from the injection sleeve 4 is performed according to the principle of leverage, the operation of detaching the suction pipe 6 from the injection sleeve 4 is extremely simple. .

At this time, in a state where one end of the suction pipe 6 is detached from the communication hole 4a of the injection sleeve 4 as described above, the air in the molten metal holding furnace 5 is passed through the inlet / outlet port 7a of the holding furnace lid 7. When sucked, the tube support 11a is in contact with the holding furnace lid 7, and the gap SL between the suction pipe 6 and the pipe insertion hole 7b is closed, so that the sealed state of the molten metal holding furnace 5 is maintained. As a result, the pressure in the molten metal holding furnace 5 decreases, and unnecessary gas such as hydrogen gas in the molten metal Me is removed.

Therefore, in the casting apparatus 1, when attaching and detaching the suction pipe 6 to and from the injection sleeve 4, the conventional operation of moving the suction pipe along the injection sleeve,
The operation of the adjusting screw, especially the screwing operation of the adjusting screw which is performed while aligning the position of one end of the suction pipe with the communication hole of the injection sleeve, which is troublesome, becomes unnecessary. Can be easily performed, and the productivity can be improved accordingly.

In the casting apparatus 1, the suction pipe 6
Covers the molten metal holding furnace 5 with the holding furnace lid 7 which penetrates slidably, so that the suction pipe 6 is kept warm by the heat of the molten metal Me in the molten metal holding furnace 5, and as a result, It is not necessary to separately provide a heating element in the tube 6, and the energy consumption can be reduced.

FIGS. 3 and 4 show another embodiment of the casting apparatus according to the present invention.

As shown in FIG. 3, in the casting apparatus 21, a cup-shaped cover 28 surrounding one end of the suction pipe 26 is fixed to the injection sleeve 24 by welding, and the inner peripheral surface of the cover 28 is fixed. Annular groove 28b formed in
Is provided with a packing (seal member) 29 that is in contact with the outer peripheral surface of one end of the suction pipe 26.
Two suction ports 28a for sucking air in the space S surrounded by the injection sleeve 24, the cover body 28, and the packing 29
Is provided.

A vacuum pump 31 is connected to one of the two suction ports 28a of the cover body 28 via a suction pipe 30, and a vacuum gauge is connected to the other suction port 28a. 32 are connected.

In this case, the degree of vacuum in the space S when the suction is performed by operating the vacuum pump 31 is set to be equal to or less than the degree of vacuum in the mold cavity in absolute pressure.

As shown in FIG. 4, when the injection tip 33 sliding inside the injection sleeve 24 closes the communication hole 24a with the suction pipe 26, the casting device 21 Molten metal Me by suction
Pump 3 started at the same time as the suction transfer
1 is provided with a control mechanism 40 for stopping the suction of the air in the space S.

The control mechanism 40 includes a displacement recognition bar (detected portion) 41 provided on the injection tip 33 and the injection sleeve 2.
The injection tip 33 is disposed on a scale 42 provided in
Is a sensor 4 that detects the displacement recognition bar 41 in a state in which the communication hole 24a with the suction pipe 26 is closed (state indicated by a virtual line).
3 and a control unit 44 which is electrically connected to the vacuum pump 31 and stops the suction of the air in the space S by an electric signal from the sensor 43.

In the casting apparatus 21, when vacuum suction in the injection sleeve 24 is started in the state shown by the solid line in FIG. 4, the molten metal Me is sucked up through the suction pipe 26 by the negative pressure generated at this time. When the molten metal Me is supplied into the injection sleeve 24 and a predetermined amount of the molten metal Me is supplied into the injection sleeve 24, the injection tip 33
Starts moving forward (moving leftward in FIG. 4).

At this time, the vacuum pump 31 is operated almost simultaneously with the start of the vacuum suction in the injection sleeve 24, and the space S surrounded by the injection sleeve 24, the cover 28, and the packing 29 through the suction port 28 a of the cover 28. When the suction of the air inside is started, the inflow of air from the connecting portion between the injection sleeve 24 and the suction pipe 26 is reduced, and as a result, the incidence of defects such as cavities can be reduced.

When the injection tip 33 sliding in the injection sleeve 24 closes the communication hole 24a with the suction pipe 26 (in a state shown by a virtual line in FIG. 4).
The displacement recognition bar 41 of the control mechanism 40 is detected by the sensor 43, and an operation stop command is sent to the vacuum pump 31 from the control unit 44 that has received the electric signal from the sensor 43. After passing through the communication hole 24a, the suction of the air in the space S is prevented from being continued, and the occurrence of a situation in which the molten metal Me flows backward to the suction pipe 26 and spouts out is prevented. Will be done.

In the casting apparatus 21, the injection sleeve 24
At the time of vacuum suction in the inside, since the degree of vacuum in the space S is maintained to be equal to or less than the degree of vacuum in the mold cavity in absolute pressure, air flows in from the connection portion between the injection sleeve 24 and the suction pipe 26. Therefore, defects such as casting cavities do not occur at all, and air flows from the connecting portion into the mold cavity from the injection sleeve 24, which is conventionally caused by the inflow of air from the connection portion. Since there is no air flow, the leading molten metal Me does not flow into the mold cavity before the inside of the injection sleeve 24 is completely filled with the molten metal Me, and therefore, the occurrence of hot boundaries and segregation is avoided. .

Further, in this casting apparatus 21, since only the small space S formed around one end of the suction pipe 26 connected to the injection sleeve 24 is sucked, the welding portion 28c between the cover body 28 and the injection sleeve 24 is drawn. The airtightness of the seal 29 and the airtightness of the packing 29 may be insufficient compared with the airtightness of the mold cavity, and one end of the suction pipe 26 connected to the injection sleeve 24 does not require precision polishing. Thus, inexpensive consumables can be used.

Further, since the casting apparatus 21 has the control mechanism 40, as described above, before the injection tip 33 that slides in the injection sleeve 24 completely closes the communication hole 24a with the suction pipe 26. After the injection tip 33 has passed through the communication hole 24a with the suction pipe 26, the inflow of air from the connecting portion between the injection sleeve 24 and the suction pipe 26 is prevented. Is prevented from flowing backward.

The detailed structure of the casting apparatus according to the present invention is as follows.
The present invention is not limited to the above embodiment.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing one embodiment of a casting apparatus according to the present invention, in which one end of a suction pipe is connected to an injection sleeve.

FIG. 2 is an explanatory longitudinal sectional view showing a state where one end of a suction pipe of the casting apparatus in FIG. 1 is detached from an injection sleeve.

FIGS. 3A and 3B are a vertical sectional view (a) and a bottom view (b) of a connecting portion between an injection sleeve and a suction pipe, respectively, showing another embodiment of the casting apparatus according to the present invention.

FIG. 4 is an explanatory diagram of an operation state of a control mechanism of the casting apparatus in FIG. 3;

FIG. 5 is an explanatory longitudinal sectional view showing a conventional casting apparatus.

[Explanation of symbols]

1, 21 Casting device 4, 24 Injection sleeve 4a, 24a Communication hole 5 Molten metal holding furnace 6, 26 Suction tube 7 Holding furnace lid 7a Injection / exhaust port 7b Pipe insertion hole (holding furnace pressure adjusting section) 10 Pipe support mechanism 11 Rod 11a Tube support (pressure holding unit in holding furnace) 12 Support shaft 13 Rod support 14 Weight 28 Cover 28a Suction port 29 Packing (seal member) 33 Injection chip 40 Control mechanism 41 Displacement recognition bar (detected part) 43 sensor 44 control unit Me molten metal S space surrounded by injection sleeve, cover body and seal member

Claims (9)

[Claims] 1. An injection sleeve communicating with a mold cavity, a molten metal holding furnace containing molten metal, and one end detachably connected to the injection sleeve and the other end immersed in the molten metal in the molten metal holding furnace. Then, in a casting apparatus having a suction pipe for sucking and transferring molten metal to the injection sleeve by vacuum suction in the injection sleeve, the suction pipe is arranged on the molten metal holding furnace side, and one end of the suction pipe is attached to and detached from the injection sleeve. A casting apparatus characterized by being supported so as to be able to approach and separate from an injection sleeve. 2. An injection sleeve communicating with a mold cavity, a molten metal holding furnace containing molten metal, and one end detachably connected to the injection sleeve and the other end immersed in the molten metal in the molten metal holding furnace. In a casting apparatus provided with a suction pipe for sucking and transferring molten metal to the injection sleeve by vacuum suction in the injection sleeve, the suction pipe is moved toward and away from the injection sleeve on the molten metal holding furnace side and one end is injected. A casting device comprising a tube support mechanism that is attached to and detached from a sleeve. 3. The casting apparatus according to claim 1, wherein the suction pipe is slidably penetrated to cover the molten metal holding furnace with a holding furnace lid. 4. A rod support mechanism comprising: a rod having one end connected to a suction pipe; a rod support for rotatably supporting an intermediate portion of the rod about a support shaft orthogonal to the rod; 4. A weight, which is detachably attached to the other end of the body.
The casting apparatus according to claim 1. 5. A holding furnace lid is provided with a pouring / exhausting port capable of injecting an inert gas or a low-active gas and sucking air in the molten metal holding furnace, and having a surplus gas in the molten metal holding furnace during gas injection. The casting apparatus according to claim 3, further comprising a holding furnace pressure adjusting unit that discharges gas and maintains a closed state of the molten metal holding furnace when suctioning air. 6. A cover body surrounding one end of a suction pipe is provided on an injection sleeve, and a seal member is provided between the cover body and one end of the suction pipe. The cover body includes an injection sleeve, a cover body, and a seal. The casting apparatus according to any one of claims 1 to 5, further comprising a suction port for sucking air in a space surrounded by the member. 7. The casting apparatus according to claim 6, wherein the degree of vacuum in a space surrounded by the injection sleeve, the cover body, and the seal member is set to be equal to or less than the degree of vacuum in the mold cavity in absolute pressure. 8. An injection sleeve, a cover, and an injection sleeve which are started at the same time as sucking and transferring molten metal by vacuum suction in the injection sleeve when the injection tip sliding in the injection sleeve closes the communication hole with the suction pipe. The casting apparatus according to claim 6, further comprising a control mechanism for stopping suction of air in a space surrounded by the seal member. 9. A control mechanism comprising: a detection target provided on the injection tip; a sensor provided on the injection sleeve for detecting the detection target in a state where the injection tip closes a communication hole with the suction pipe; 9. The casting apparatus according to claim 8, further comprising a control unit for stopping suction of air in a space surrounded by the injection sleeve, the cover body, and the seal member by the electric signal.