JP2001047220A - Molten metal vessel and sucking/exhausting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vessel for preventing the contamination of molten metal and a sucking/exhausting method. SOLUTION: To the cylindrical closed vessel 1 provided with a pipe 3 fitting an opening/closing tool 4 at the upper part, a concave sucking/exhausting tube 2 so as to be freely attached/detached, is connected at the lower part. As the other way, the opening part surface of the sucking/exhausting tube 2 is arranged into a receiving dish having the outer peripheral surface higher than this opening part surface. Further, at the front part of the opening/closing tool 4, a pressure device 5 is arranged. Furthermore, one or more of filters are fitted to the sucking/exhausting tube 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a container for accommodating and transferring molten metal and a method for sucking and discharging the molten metal.

[0002]

2. Description of the Related Art Metal raw materials are heated in a reverberatory furnace or crucible furnace to become molten metal, that is, molten metal. In addition, examples of the reflection furnace include a melting furnace and a holding furnace, and a melting and holding furnace having both the melting furnace and the holding furnace. The molten metal melted in the melting furnace is poured into a holding furnace by a gutter or the like, settled, transferred to a transfer container such as a ladle, transported to a casting furnace or the like by a transport vehicle such as a fork, and transported. The molten metal in the casting furnace is poured by a robot or a caster into a mold by scooping the molten metal from the surface using a ladle or a ladle. In the low-pressure casting, the casting furnace is closed, a low pressure is applied to the inside of the furnace, and the molten metal is poured into the upper mold through a stalk tube immersed in the molten metal.

[0003]

SUMMARY OF THE INVENTION Recycling of recovered resources has progressed, and the proportion of nonmetallic inclusions in metal raw materials tends to increase as compared to before. On the other hand, the amount of flux used for removing these substances tends to be reduced from an environmental point of view. In recent years, attention has been paid to a pre-furnace inspection apparatus for nonmetallic inclusions in molten metal, which digitizes the cleanliness of a molten metal using a personal computer. Therefore, it is extremely important to control the process of the molten metal from the melting of the raw material to the casting in the factory, that is, to maintain the cleanliness of the molten metal.

[0004] In mass production factories such as die casting and low pressure casting, metal raw materials such as ingots are melted in a reverberatory furnace. Thereafter, the molten metal is transferred to a ladle and transferred to a casting furnace. In this case, the hot water is poured twice from the reverberatory furnace or the like to the ladle and the hot water is poured from the ladle into the casting furnace twice. In the pouring, a large amount of non-metallic inclusions, such as oxides, called slags are generated by dropping the molten metal, and hydrogen gas is introduced from the atmosphere. This causes a decrease in the yield and mechanical strength of the molten metal, generation of defective products such as leakage, and damage to the cutting blade during machining. On the other hand, although the melting and holding furnace does not have the above-described water transfer step, in the melting chamber, the temperature of the molten metal at the interface becomes high due to the burner flame, so that oxides and the like are generated. Therefore, the relative cleanliness of the molten metal is higher than that of the crucible furnace. However, the two melting methods have an advantage that a large amount of molten metal can be obtained. On the other hand, melting of raw materials and the like in a crucible furnace can provide the highest quality molten metal, but is not suitable for a melting method in a mass production factory that requires a large amount of molten metal because the melting time is long and the melting efficiency is low. is there.

In the internal state of the molten metal, an oxide film or the like rises and floats on the surface. At the bottom of the furnace, nonmetallic inclusions and intermetallic compounds having a high specific gravity settle, so that the cleanliness of the upper and lower portions of the molten metal is low. Therefore, it is desirable that the molten metal for pouring be collected from the middle zone of the furnace. The problem to be solved by the present invention is to obtain a molten metal from a middle zone having a high degree of cleanliness, and a molten metal container for preventing generation of nonmetallic inclusions such as oxides and introduction of hydrogen gas at the time of hot water transfer. The point is to provide a suction and discharge method.

[0006]

In order to achieve the above object, a molten metal container according to the present invention comprises a pipe having an opening / closing member on an upper part, a detachable suction / discharge pipe for sucking and discharging the molten metal, and a lower part. A container having a cylindrical body in which a connecting portion of the suction / discharge pipe is cut out, and a pan detachably attached to the container or the suction / drain pipe and capable of tilting up and down and back and forth. A molten metal container characterized by being located in the tray. Alternatively, a pipe having an opening / closing tool at an upper part, a detachable suction / drain pipe for sucking and discharging the molten metal, and a cylindrical body having a connection part of the suction / drain pipe cut at a lower part are provided. A concave molten metal reservoir is provided in the pipe, and a lower surface inside the pipe located higher than an upper upper surface inside the pipe located at the bottom of the molten metal reservoir is provided near an opening surface of the suction and discharge pipe. And Further, the tip of the pipe is connected to a pressure device. Further, a molten metal container is characterized in that one or more detachable filters are arranged in a part of the suction and discharge pipe. A step of opening the opening / closing device to bring the inside of the container to atmospheric pressure and introducing the molten metal into the container, and a step of closing the opening / closing device when the molten metal is introduced, closing the container, and maintaining the internal pressure. Opening and closing the opening / closing device to discharge the molten metal from the container. Or a step of opening the opening / closing tool and depressurizing the inside of the container to suck the molten metal into the container, and a step of closing the opening / closing tool when the molten metal is stored, closing the container, and maintaining the internal pressure. Opening and closing the opening and closing means to discharge the molten metal from inside the container by applying pressure.

[0007]

The molten metal container of the present invention can perform two types of suction and discharge methods, ie, no pressure application or pressurization inside the container. One is to cover the opening surface of the suction and discharge pipe with a cap and soak up to the intermediate zone below the oxide film layer at the interface of the molten metal. Therefore, there is no inflow of an oxide film or the like during immersion. Thereafter, the cap is removed, a required amount of molten metal is stored in the container, and the rear opening and closing device is closed.
At this time, the lower end surface of the molten metal in the container is from the upper surface inside the tube located at the bottom of the molten metal reservoir of the concave portion in the suction / drainage tube to the lower surface inside the tube located higher near the opening surface, or Since the tip of the suction and discharge pipe is opened in the molten metal accumulated in the receiving pan, the container is closed and a constant pressure inside is ensured. Therefore, even if the interlocking tray attached to the concave suction / discharge pipe or the suction pipe or the like is pulled out of the molten metal, the molten metal in the container or the suction / drain pipe does not drop and discharge from the opening surface. The molten metal in the container is pressurized in the atmosphere by opening the opening and closing device, and is discharged from the opening surface of the suction and discharge pipe. In this way, the molten metal can be stored and discharged without using a pressure device. The cap at the time of immersion may not be used if the opening / closing device is closed to expand the air in the container, and if the conditions such as the inner diameter of the opening surface of the suction / discharge tube and the immersion speed are met.

Another method is to open the opening / closing device, fill the container with gas from a pressure device, and immerse a small amount of gas into the molten metal through the opening surface at the tip of the suction / discharge pipe. There is no inflow. When the opening surface of the suction pipe end reaches the sampling position of the intermediate band, the pressure in the container is reduced and suction is performed. After that, when a predetermined amount of molten metal is stored in the container,
Close the opening / closing device and pull up from the molten metal while maintaining the reduced pressure in the container. Also in this case, the molten metal in the container and the suction / drainage pipe does not drop and discharge from the opening surface as in the case described above. The molten metal in the container is discharged by moving the container to a predetermined position and opening the on-off valve, or pressurizing the inside of the container by a pressure device. The use of an inert gas such as argon as a pressure source is good for preventing oxidation.

In a casting furnace, hot water is usually supplied leaving about 200 mm of bottom water from the furnace bottom. The hot water supplied to the casting furnace by this container is discharged by immersing the opening surface of the suction and discharge pipe in the bottom hot water, so there is very little contact with the atmosphere, and the molten metal due to the head drop when pouring in the ladle No rampage occurs. Further, in the present molten metal container, since most of the molten metal is stored in an environment that is isolated from the atmosphere in the container and the suction and discharge pipes, oxidation and a decrease in the temperature of the molten metal are small.

[0010] Since the filter is periodically replaced, the filter is attached to a portion of the suction and discharge pipe which is easy to attach and detach. This not only makes it possible to obtain molten metal with a high degree of cleanliness, but when it is attached to the tip of a suction pipe such as an opening surface, the overflow of the molten metal due to vibration and impact received during transfer is reduced, and the outflow state is reduced. Is a stable and quiet flow. In addition, when the pipe is attached to the upper part of the suction and discharge pipe, it is possible to reduce a sudden drop of the molten metal in the container caused when the suction and discharge pipe is damaged.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a molten metal container and a method of sucking and discharging according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the present molten metal container, showing a process of sucking the molten metal from the molten metal tank into the container. Reference numeral 20 denotes a molten metal tank that stores a molten metal 21 such as aluminum. A suction pipe 2 connected to a lower part of the container 1 is immersed in the molten metal tank 20, and a pipe 3 and a switch 4 are arranged on the upper part of the container 1. The opening / closing tool 4 and the pressure device 5 are opened, and the pressure in the container 1 is reduced by the pressure device 5.
The molten metal 21 in the tank is sucked.

FIG. 2 is a cross-sectional view of the present molten metal container, showing a process in which the molten metal is stored and moved in the container. Reference numeral 20 denotes a molten metal tank for storing a molten metal 21 such as aluminum. When the molten metal 22 of the container portion is stored in the container 1, the opening / closing tool 4 at the top of the container 1 is closed. The molten metal 22 in the container is stored up to the lower surface 9 inside the tube located higher than the upper surface 8 inside the tube located at the bottom of the molten metal reservoir 7 of the suction / discharge tube 2 and is in a sealed state, so that the opening of the suction tube is opened. It does not overflow from surface 6. In this figure,
The lower surface, the upper surface, and the opening surface inside the tube are at the same height.

FIG. 3 is a sectional view of the present molten metal container, showing the process of discharging the molten metal from the container. Code 20
Is a molten metal tank for storing a molten metal 21 such as aluminum. The opening and closing member 4 at the upper part of the container 1 is opened with a port to the pressure device 5, and the inside of the container 1 is pressurized by the gas from the pressure device 5 through the pipe 3, and the molten metal 22 in the container portion is opened.
Is discharged from the opening surface 6 of the suction pipe in the bottom bath 10 of the casting furnace 23.

FIG. 4 is an example showing the details of the suction / discharge pipe section. The concave-shaped molten metal reservoir 7 has a U-shape, and a lower surface 9 inside the tube located higher than an upper surface 8 located inside the lowermost tube is provided up to the opening surface 3 of the suction / discharge tube. The opening surface 6 of the suction and discharge pipe is opened laterally, and a filter 11 is mounted.

FIG. 5 shows an intake / exhaust pipe composed of three parts.
FIG. When the molten metal 21 in the tank is housed in the container 1 with a structure in which a part of the suction and discharge pipe 2 is movable, the movable part 12 is located at the position Y and the molten metal reservoir 7 having a concave shape is formed. Is done. At the time of discharge, the entire amount is discharged by changing the position to X.

FIG. 6 is an example of a diagram comprising a container, a suction / discharge tube and a tray, showing a process in which the molten metal in the tank is stored in the container and moved similarly to FIG. Upper part is opening and closing device 4
Is closed, and the lower part stores the molten metal 22 of the container from the container 1 to the tray 13 and the outer peripheral surface 14, and the opening surface 6 of the suction / discharge pipe opens into the molten metal 22 of the container in the tray 13. . Therefore, the molten metal 22 in the container does not overflow from the outer peripheral surface 14 of the tray. Further, a small amount of the molten metal 22 remaining in the tray 13 after discharging is
Is inclined and eliminated. Also, the molten metal 2 in the saucer 13
2 can be solidified to form a metal lid. When the metal lid is immersed in the bottom bath 10 of the casting furnace 23, it is melted and opened. In addition, the above-mentioned example of the drawing is one example of the molten metal container of the present invention.
It shows an embodiment and is not limited to the range and combination shown by the example in the drawings.

[0017]

According to the present invention, a clean molten metal can be collected without pressure from the intermediate zone of the casting furnace, which is difficult with a ladle or a ladle. In addition, by using the pressure device, the workability and the function of adjusting the flow rate at the time of pouring are improved without the attachment and detachment of the cap. If the opening surface of the suction and discharge pipe is immersed in the middle zone of the molten metal, a required amount of molten metal can be sucked by decompression, so that the contact surface of the container with the molten metal is reduced and maintenance is facilitated. In addition, by providing the filter on the suction pipe and the like, it is possible to obtain a molten metal having a higher degree of cleanliness, and it is possible to reduce the overflow and scattering of the molten metal from the opening face of the suction and discharge pipe due to vibration or the like, thereby improving safety. In addition, since the molten metal is held in the container and the molten metal is transferred quietly with less contact with the atmosphere, the temperature drop is suppressed, the increase in hydrogen gas and the generation of oxides are reduced, and the molten metal yield is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the entire molten metal storage device of the present invention, showing a state in which molten metal in a tank is sucked. FIG. 2 is a cross-sectional view showing the entire molten metal storage device of the present invention, showing a state from completion of suction to movement. FIG. 3 is a cross-sectional view showing the entire molten metal storage device of the present invention, showing a discharged state after the movement. 4 and 5 are cross-sectional views showing an example of details of the suction and discharge pipe. FIG. 6 is a cross-sectional view showing a state from suction to movement, which constitutes a suction and discharge pipe by a container, a suction and discharge pipe, and a receiving tray.

[Explanation of symbols]

1. . . . . . . . . . . . . . . . . . . . Container 2. . . . . . . . . . . . . . . . . . . . 2. Intake and exhaust pipe . . . . . . . . . . . . . . . . . . . Pipe 4. . . . . . . . . . . . . . . . . . . . Opening / closing device 5. . . . . . . . . . . . . . . . . . . . Pressure device 6. . . . . . . . . . . . . . . . . . . . 6. Opening surface of suction pipe . . . . . . . . . . . . . . . . . . . 7. Molten metal pool . . . . . . . . . . . . . . . . . . . 8. Top surface inside the tube located at the bottom . . . . . . . . . . . . . . . . . . . 9. Lower surface inside the tube located higher . . . . . . . . . . . . . . . . . . Sokoyu 11. . . . . . . . . . . . . . . . . . . Filter 12. . . . . . . . . . . . . . . . . . . Movable part 13. . . . . . . . . . . . . . . . . . . Saucer 14. . . . . . . . . . . . . . . . . . . Outer peripheral surface of saucer 20. . . . . . . . . . . . . . . . . . . Molten metal tank 21. . . . . . . . . . . . . . . . . . . Molten metal in tank 22. . . . . . . . . . . . . . . . . . . Molten metal in container section 23. . . . . . . . . . . . . . . . . . . Casting furnace

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[Procedure amendment]

[Submission date] August 5, 1999 (1999.8.5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

The molten metal container of the present invention can perform two types of suction and discharge methods, ie, no pressure application or pressurization inside the container. One is to cover the opening surface of the suction and discharge pipe with a cap and soak up to the intermediate zone below the oxide film layer at the interface of the molten metal. Therefore, there is no inflow of an oxide film or the like during immersion. Thereafter, the cap is removed, a required amount of molten metal is stored in the container, and the rear opening and closing device is closed.
At this time, the lower end surface of the molten metal in the container is from the upper surface inside the tube located at the bottom of the molten metal reservoir of the concave portion in the suction / drainage tube to the lower surface inside the tube located higher near the opening surface, or Since the tip of the suction and discharge pipe is opened in the molten metal accumulated in the receiving pan, the container is closed and a constant pressure inside is ensured. In addition, in the pipe located at the bottom of the molten metal pool
Inside the tube located higher than the opening on the side
Part of the molten metal in the bottom of the vessel or in the saucer where the suction pipe is buried
The surface is under atmospheric pressure. Therefore, even if the tray attached to the suction and discharge pipe or the suction pipe or the like is lifted from the molten metal, the molten metal in the container or the suction and discharge pipe does not drop and discharge from the opening surface. The molten metal in the container is pressurized in the atmosphere by opening the opening and closing device, and is discharged from the opening surface of the suction and discharge pipe.
In this way, the molten metal can be stored and discharged without using a pressure device. The cap at the time of immersion may not be used if the opening / closing device is closed to expand the air in the container, and if the conditions such as the inner diameter of the opening surface of the suction / discharge tube and the immersion speed are met.

Claims (6)

[Claims] 1. A pipe having an opening / closing tool at an upper part, a detachable suction / drain pipe for sucking / discharging molten metal, and a cylindrical container having a connection part of the suction / drain pipe cut at a lower part. A molten metal container, which is a tray detachably attached to the container or the suction / discharge pipe and tiltable up and down and back and forth, wherein an opening surface of the suction / discharge pipe is located in the tray. 2. A cylindrical container having a pipe provided with an opening / closing tool at an upper part, a detachable suction / drain pipe for sucking and discharging the molten metal, and a connection part of the suction / drain pipe at a lower part. Become
A concave molten metal reservoir is provided in a part of the suction and discharge pipe,
A molten metal container, wherein a lower surface on the inner side of the tube located higher than an upper surface on the inner side of the tube located at the lowermost portion of the molten metal reservoir is provided near the opening surface of the suction / discharge tube. 3. The molten metal container according to claim 1, wherein a tip of the pipe is connected to a pressure device. 4. The molten metal container according to claim 1, wherein one or more detachable filters are disposed in the suction / discharge pipe. 5. A step of opening the opening and closing device to bring the inside of the container to atmospheric pressure and introducing the molten metal into the container, and closing the opening and closing device when the molten metal is introduced to seal the container and reduce the internal pressure. Claims 1 and 4, or Claims 2 and 4, comprising a step of holding and a step of opening the opening / closing tool and discharging the molten metal from inside the container. Item 5. The method according to any one of the four items. 6. A step of opening the opening / closing tool and depressurizing the inside of the container to suck the molten metal into the container, and closing the opening / closing tool when the molten metal is stored, closing the container and reducing the internal pressure. Claims 1, 3, and 4, wherein the step of holding and the step of opening and closing the opening / closing tool and discharging the molten metal from the container are performed. Item 5. The suction / discharge method according to any one of the second, third, and fourth ranges.