JPH09206910A - Closed type molten metal supplying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously and stably obtain a high quality cast product without cast defect by providing an introducing tube incorporated into a ladle at the one end and inserted into an injection sleeve while projecting from the ladle at the other end to pour molten metal into the injection sleeve. SOLUTION: A valve rod 22 is risen by operating a valve rod cylinder 24 and a suction hole 20c is made to opening state, and while exhausting gas in the ladle 20, the molten metal M in a melting and holding furnace 10 is naturally sucked into the ladle 20. Successively, the suction hole 20c is closed by lowering the valve rod 22, and after completing the suction of the regulated quantity of the molten metal into the ladle 20, the tip part 28a of spouting part of the introducing tube 28 is lowered and adjusted to approach the upper surface of the plunger chip 200a and inert gas pressed to the low pressure is poured into the ladle 20. The molten metal surface in the ladle 20 is pressed and the molten metal is flowed into the introducing tube 28 and dropped from the tip part 28a of spouting part on the introducing tube 28 and started to pour into the injection sleeve 200.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a closed type hot water supply device for supplying a molten metal such as an aluminum alloy or a magnesium alloy to an injection sleeve of a molding machine such as a die casting machine, and more particularly, to improve the precision of hot water supply and the molten metal during ladle transfer. The present invention relates to a sealed hot water supply device that takes measures against dripping.

[0002]

2. Description of the Related Art Conventionally, in order to supply a molten metal such as an aluminum alloy or a magnesium alloy to an injection sleeve of a die casting machine, conventionally, as shown in FIG.
Using a mechanical mechanism, the ladle 20 that has taken out the molten metal inside rises or moves laterally while drawing an arcuate locus to move to the position of the inclined injection sleeve 200, and then,
The ladle inversion method of pouring the molten metal in the ladle 20 into the injection sleeve has been adopted. Further, as shown in FIG. 7, a lid 20a is provided on the top and an opening (suction port 20c) is provided on the bottom, and an unsealed ladle 20 having an air vent 20d on the lid 20a is dipped into the melting and holding furnace 10 to form the bottom. Opening 2
After the molten metal has penetrated into the ladle 20 from 0c, the opening 2
After closing 0c, the ladle 20 is moved to the position of the inclined injection sleeve 200, and while the ladle 20 is inclined along the axis of the injection sleeve 200 while the bottom of the ladle is inserted into the injection sleeve 200, A method has also been employed in which the opening 20c is changed from the closed state to the open state, and the molten metal inside the ladle is naturally dropped and supplied (supplied with hot water) into the injection sleeve 200. This method is called the bottomed ladle method.

[0003]

However, in any of the above-mentioned ladle inversion method and bottomed-out ladle method, the pouring port (ladle discharge port) to the injection sleeve is the ladle body when pouring the molten metal into the ladle. Since the molten metal is immersed in the melting and holding furnace, the molten metal not only enters the inside of the ladle but also adheres to the outer periphery of the ladle, moves the ladle to the position of the injection sleeve, and adheres to the outer periphery of the ladle during the subsequent pouring operation. The molten metal reacts with oxygen in the air to produce oxides,
In addition, this drops during pouring and drops into the injection sleeve together with the molten metal inside the ladle. Therefore,
There is a problem that this oxide is mixed in a cast product after die casting, which causes deterioration of quality. Further, in the above-mentioned bottomed ladle system, when the opening (suction port 20c) is opened downward in the center of the bottom and the seal of the switchgear after the molten metal is taken into the ladle is incomplete. , Dripping of molten metal occurs when transferring the ladle to the injection sleeve,
There is a problem that not only it is dangerous but also the work environment is significantly polluted. Further, if the molten metal surface of the melting and holding furnace is different each time the molten metal is supplied, the amount of molten metal taken into the ladle 20 will be slightly different, resulting in variations in the amount of molten metal poured each time, and as a result, the amount of molten metal supplied to the injection sleeve. Since there are variations, the hot water supply accuracy is low and the quality of the cast product cannot be kept uniform. Further, in the above-mentioned ladle (the ladle 20 in FIG. 6 and the ladle 20 in FIG. 7), the height of the molten metal that falls into the injection sleeve at the beginning of hot water supply is large, and the surrounding air is engulfed at the time of a large drop height. There is a risk of causing casting defects such as blowholes in the cast product by inducing the above.

[0004]

In order to solve the above problems, in the present invention (first invention), a closed type hot water supply for supplying molten metal of aluminum alloy or magnesium alloy into an injection sleeve of a die casting machine or the like. A device for raising and lowering a valve rod and a valve rod, which is provided with a molten metal suction port which is immersed in a melting and holding furnace for molten metal and is suspended Equipped with an opening / closing device including a valve rod cylinder of the outside of the ladle body, the ladle suspension supporting elevating means, one end housed in the ladle and the other end protruding from the ladle and inserted into the injection sleeve. And a conduit for pouring the molten metal in the ladle to the injection sleeve, and means for injecting a pressurized gas for pressurizing the liquid surface of the molten metal in the ladle, and the molten metal discharge side of the conduit is With tilting towards,
The raising and lowering direction of the ladle suspension support elevating means is inclined parallel to the inclined injection sleeve. Also, in the second invention, in the hermetically sealed water heater of the first invention,
The suction port for the molten metal of the ladle was opened upward.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The closed hot water supply apparatus of the present invention is a closed hot water supply apparatus for supplying molten metal of aluminum alloy or magnesium alloy into an injection sleeve of a die casting machine or the like, which is provided in a melting and holding furnace for molten metal. A ladle body is provided with an opening / closing device that is provided with a molten metal suction port that is immersed and suspended and that projects to the side of the bottom and that is capable of blocking communication, and that includes a valve rod that shuts off the suction port and a valve rod cylinder for lifting the valve rod. A ladle provided on the outside of the ladle, the ladle suspension supporting elevating means, one end housed in the ladle and the other end protruding from the ladle and inserted into the injection sleeve, and pouring the molten metal in the ladle to the injection sleeve. A conduit for hot water and a means for injecting a pressurized gas for pressurizing the melt surface in the ladle are provided, and the melt discharge side of the conduit is inclined downward. Serial ladle is as was inclined parallel to said injection sleeve inclined constituting the lifting direction of the suspension supporting the lifting means. Therefore, the ladle is immersed in the melting and holding furnace containing the molten metal, and the molten metal is sucked into the ladle from the molten metal suction port provided to project to the side of the bottom of the ladle and taken in. The intake port is closed by an opening / closing device consisting of a valve rod that can move up and down on the side of the main body and a valve rod cylinder for raising and lowering the valve rod. In the bottomed ladle system provided with a lid, gas sealing between the sealing lid and the valve rod is necessary, but in the present invention, since the valve rod does not have a structure that penetrates the sealing lid, the valve rod and the ladle sealing lid are There is no need to consider the gas seal of. After the molten metal has been taken up into the ladle, operate the ladle suspension support elevating means to transfer the ladle and insert the tip of the discharge side of the conduit connected to the ladle to near the top of the plunger tip at the bottom of the injection sleeve. Pressurized gas such as gas is blown into the ladle, and the pressing force supplies the molten metal in the ladle into the injection sleeve through the conduit. At this time, the molten metal surface in the ladle is operated by operating the ladle suspension supporting elevating means so as to contact the lower surface of the canopy of the ladle, and there is no residual amount in the ladle of the pressurized gas injected into the ladle, or By supplying hot water while keeping it almost non-existent, the temperature change in the ladle of the pressurized gas is minimized and the pressing force of the pressurized gas is maintained at a nearly constant value every time, so that variations in the amount of hot water can be achieved. It is desirable to reduce the amount to improve hot water supply accuracy. Further, in the second invention, since the molten metal suction port of the ladle is opened upward, the opening is upward even if the seal when the switchgear is closed due to aging is slightly incomplete. The molten metal is unlikely to leak and the dripping of the molten metal in the ladle during movement of the ladle to the injection sleeve can be minimized. When supplying molten metal from the ladle to the injection sleeve, the tip of the discharge side of the conduit is inserted into the bottom surface of the injection sleeve and stopped, and then hot water supply is started and the molten metal in the injection sleeve progresses with the progress of the hot water supply. When the molten metal immersion depth at the tip of the discharge side of the conduit reaches a predetermined value due to the rise of the liquid level, it is integrated with the conduit at the same speed as the rise of the molten metal liquid level so as to keep the predetermined molten metal immersion depth constant. If the hot water is supplied while raising the ladle, it is possible to prevent splashing and splashing that occur when the molten metal falls, so that air entrapment in the molten metal is prevented, and the depth of immersion of the molten conduit in the injection sleeve is prevented. Since the hot water supply progresses in a shallow and constant state, the amount of molten metal adhering to the outside of the conduit is a constant minute amount,
It is also possible to clean the outside each time to remove oxides. Therefore, in the closed type water heater of the present invention,
Compared to the conventional technology, the hot water supply conditions are made uniform every time, so the hot water supply accuracy is high, and there is less molten metal dripping during ladle transfer.
In addition, the quality of the cast product can be maintained in good condition, since there is little mixing of molten oxide.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 5 are all related to an embodiment of the present invention, FIG. 1 is an overall configuration diagram of a closed type hot water supply device, FIG. 2 is an enlarged vertical sectional view of a main part of the closed type hot water supply device (during hot water supply), and FIG. FIG. 4 is a front view of the non-working oxide removing device showing an AA view of FIG. 2, and FIG. 5 is B of FIG. FIG. 6 is an enlarged vertical cross-sectional view of a main part of the closed-type hot water supply device showing the position state of the oxide removing device during the work viewed from the position B.

As shown in FIG. 1, a hermetically sealed hot water supply apparatus 1 according to a first aspect of the present invention is a ladle suspension-supporting lifting cylinder in which an upright cylindrical ladle 20 is inclined and fixed to a building (or structure) 50. The piston 60 is connected to the tip of a piston rod 60a and suspended, and is held so that most of it is immersed in the melting and holding furnace 10. The upper end of the ladle 20 is bolted by a canopy 20a and a sealing lid 20b, respectively. An opening (suction port) that is joined and sealed via a nut and that is provided so as to project to the side of the bottom and that allows the molten metal M in the crucible 10a of the melting and holding furnace 10 to be sucked into the ladle 20 (suction port) 20c) and for lifting and lowering the valve rod 22 for disconnecting the inlet 20c and the melting and holding furnace 10 from each other and the valve rod 22 fixedly mounted on the support 24a attached to the canopy 20a. And a switching device 40 comprising a valve stem cylinder 24. It.

On the other hand, the canopy 20a and the sealing lid 20b have one end penetrating downward into the ladle 20 and the other end curved to incline the inclined axis X of the injection sleeve 200 of the die casting machine.
A conduit 28 that is inclined and descends along −X is attached, and an inert gas supplied from an inert gas supply device 70 such as N ₂ gas, Ar gas, or CO ₂ gas is injected into the ladle 20. An active gas pipe 30 is provided.
Ladle support 2 attached to the top of the sealing lid 20a
As described above, 6 is connected to the tip of the piston rod 60a of the ladle suspension support elevating / lowering cylinder 60.
Is movable up and down along an integrally inclined axis X-X.

As the pressurized gas, in addition to the inert gas, waste gas in the factory, combustion gas, or normal air can be used, but in order to prevent the oxidation of the molten metal, the gas containing no oxygen is used. Active gas (N ₂ gas, Ar gas, CO ₂ gas, etc.) is desirable. The inert gas pipe 30 is configured to pass through the temperature control device 90 and be heated to a desired temperature after exiting the inert gas supply device 70, and the inert gas supply device 70 and the temperature control device 90 are connected to each other. The inert gas supply control device 80 between the two is configured so that the temperature rise and the supply time can be controlled arbitrarily. Also three hydraulic cylinders,
Ladle suspension support lifting cylinder 60, valve rod cylinder 24, and cleaning tool lifting cylinder 1 of the oxide removing apparatus 100 described later.
Each of the hydraulic pipes 10 is independently connected to a hydraulic unit (not shown), and the hydraulic unit is connected to a programmable controller (not shown) to receive an operation command from the programmable controller and operate.

Also, as shown in FIGS.
An oxide removing device 100 that removes and cleans the molten metal and molten oxide attached to the outer periphery of the tip of the discharge portion is disposed on the conduit discharge side of the support 26. As shown in FIGS. 4 to 5, the oxide removing apparatus 100 includes a cleaning tool opening / closing cylinder 120 and a cleaning tool opening / closing cylinder 120 that includes a pair of left and right cleaning tools 122 that grip the outer periphery of the conduit 28 and slide in the conduit axial direction. The cleaning tool lifting cylinder 110 is configured to move the cylinder 120 up and down in the axial direction of the conduit, and the cleaning tool opening and closing cylinder 120 is retracted upward as shown in FIG. After completion, each time the cleaning tool 122 is slid up and down on the discharge lower end of the conduit 28 as shown in FIG. 3, the molten metal or molten oxide adhering to the outer periphery of the conduit is peeled and removed. The cleaning tool lifting cylinder 110 and the cleaning tool opening / closing cylinder 120 may be air cylinders instead of hydraulic cylinders. In addition, in order to grasp the amount of molten metal taken into the ladle 20, as shown in FIG.
As shown in FIG. 3 and FIG. 3, a molten metal level detecting sensor such as a laser light sensor 160 or an ultrasonic sensor 170 is provided.

The operation of the sealed hot water supply apparatus 1 of the present invention having the above-described structure will be described. First, in the ladle 20 held in the state as shown in FIG.
4 is operated to raise the valve rod 22 and open the suction port 20c to discharge the gas in the ladle 20 while melting and holding the furnace 10.
The molten metal M is naturally sucked into the ladle 20. Ladle 20
The amount of molten metal sucked in is adjusted by the height of the ladle 20 buried in the melting and holding furnace 10 or is adjusted by a molten metal level detection rod (not shown) arranged outside the ladle 20, but in this case, As shown in FIG. 2, the molten metal liquid level in 20 is
It is desirable that the amount of the inert gas sealed in the ladle 20 is made as small as possible by contacting with the lower surface of the sealing lid 20b or keeping the sealing lid 20b in a state in which it is sliding. After this,
Inert gas supply device 7 via inert supply control device 80
When 0, the inert gas is supplied into the ladle through the inert gas pipe 30. In addition, the inert gas is used in the temperature control device 9
A value close to the molten metal temperature due to 0, for example, 250 to 70
It is desirable to heat and supply to a constant temperature state within the range of 0 ° C.

Next, after the valve rod 22 is lowered to close the suction port 20c and the suction of the specified amount of the molten metal into the ladle 20 is completed, the ladle suspension supporting lift cylinder 60 is operated to operate the conduit 2
The tip of the discharge part of No. 8 is lowered to adjust the discharge part tip 28a of the conduit 28 close to the upper surface of the plunger tip 200a in the injection sleeve 200, and a low pressure of about 1.2 kg / cm ^{2 is applied in} advance. When the pressurized inert gas is injected into the ladle 20, the molten metal surface inside the ladle 20 is pressurized and flows through the conduit 28 to drop from the tip 28a of the discharge portion 28a of the conduit 28 to start pouring into the injection sleeve 200. When the pouring work is started, the injection sleeve 20
Since the liquid level of the molten metal entering 0 starts to rise gradually, conduit 2
After the tip 28a of the discharge portion 8 of No. 8 is immersed in the melt surface by about 20 mm, the conduit 28 is moved at the same speed as the rising speed of the melt surface.
Radle 20 so that By doing so, hot water is supplied into the injection sleeve 200 while maintaining the molten metal immersion depth of the discharge portion tip 28a at the above-mentioned constant value of about 20 mm. The amount of hot water supplied to the injection sleeve 200 is, for example, lower than or equal to the lower end of the molten metal level detecting rod 150a immersed in the ladle at a certain depth due to the molten metal liquid level in the ladle being lowered, The supply of the inert gas is stopped at the time when the flowing current is in the non-conducting state, so that the molten metal reaches a predetermined amount. In this way, a specified amount of molten metal is supplied from the ladle 20 into the injection sleeve 200 by supplying the inert gas for a specified time. The above-described series of work procedures (immersing the ladle 20 in the melting and holding furnace, suction work by raising the valve rod 22, closing the suction port 20c by lowering the valve rod, inserting the tip of the conduit into the injection sleeve, inserting an inert gas It is also possible to input a sequence start / stop program for pouring in the ladle, raising the conduit during hot water supply, etc. into the programmable controller in advance and automatically continue the work according to this program.

Further, when the hot water is supplied to the injection sleeve 200, since the immersion depth of the tip 28a of the discharge portion of the conduit 28 is kept substantially constant, the molten metal is splashed and splashed by falling into the injection sleeve 200. There is little air entrapment. In addition, the state of the molten metal that adheres to the outside of the discharge portion tip 28a is constant every time, and the molten oxide that has adhered is removed using the oxide removing device 100 after the hot water supply is completed. Almost no contamination

[0014]

As described above, in the sealed hot water supply apparatus of the present invention, there is almost no dripping during the transfer of the ladle,
In addition, the hot water supply accuracy is improved, and since the hot water is supplied with the pressing force of the pressurized gas blowing, there is almost no oxide inclusion, and air entrainment during pouring is prevented as much as possible, so there is no casting defect and high quality. Can be continuously and stably supplied.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a closed water heater according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a main part of the sealed hot water supply device (during hot water supply) according to the embodiment of the present invention.

FIG. 3 is an enlarged vertical cross-sectional view of a main part of the sealed hot water supply device (during oxide removal cleaning) according to the embodiment of the present invention.

FIG. 4 is a front view of the oxide removing apparatus in a non-working state, which is taken along the line AA of FIG. 2.

5 is an enlarged longitudinal cross-sectional view of a main part of the sealed hot water supply device showing the position state of the oxide removing device during the work as viewed from BB in FIG.

FIG. 6 is an explanatory diagram of a conventional hot water supply device.

FIG. 7 is an explanatory diagram of a conventional hot water supply device.

[Explanation of symbols]

 1 Closed Hot Water Supply Device 10 Melt Holding Furnace 10a Crucible 20 Ladle 20a Canopy 20b Closed Lid 20c Suction Port 22 Valve Bar 24 Valve Bar Cylinder 24a Support 26 Laddle Support 28 Conduit 28a Discharge Tip 30 Inert Gas Piping 40 Switchgear 50 Building ( Or structure) 60 Laddle suspension support lifting cylinder 60a Piston rod 70 Inert gas supply device 80 Inert gas supply control device 90 Temperature control device 100 Oxide removal device 102 Support 110 Cleaning tool lifting cylinder 120 Cleaning tool opening / closing cylinder 122 Cleaning tool 150a Liquid level detection rod 160 Laser light sensor 170 Ultrasonic sensor 200 Injection sleeve 200a Plunger tip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadayuki Danura 1980, Okiyama, Ogushi, Oji, Ube, Yamaguchi Prefecture Ube Industries, Ltd. Machinery & Engineering Business Headquarters

Claims (2)

[Claims] 1. A closed type hot water supply device for supplying a molten metal of an aluminum alloy or a magnesium alloy into an injection sleeve of a die casting machine or the like, which is soaked and suspended in a melting and holding furnace for molten metal so as to project to the side of the bottom. A ladle provided with an opening / closing device, which is provided with a suction port for molten metal capable of interrupting communication, and which has a valve rod for interrupting the communication of the suction port and a valve rod cylinder for lifting the valve rod outside the ladle body, and the ladle suspension support An elevating means, a conduit having one end housed in the ladle and the other end protruding from the ladle and inserted into the injection sleeve for pouring the molten metal in the ladle to the injection sleeve; and a molten metal surface in the ladle. And a means for injecting a pressurized gas for pressurizing the molten metal. Closed type hot water supply device comprising the said was inclined parallel to the injection sleeve. 2. The closed type hot water supply apparatus according to claim 1, wherein a suction port for the molten metal of the ladle is opened upward.