JP4294996B2 - Ladle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ladle used when refilling molten aluminum (hereinafter referred to as molten metal) from a melting furnace to a molten metal holding furnace.
[0002]
[Prior art]
Conventionally, when the molten metal is replenished from the melting furnace to the molten metal holding furnace, the molten metal entrains water vapor in the air to generate hydrogen gas, and in the casting operation as it is, there are burrows (hereinafter referred to as casting cavities) in the product. It was formed and it was easy for quality problems to occur.
[0003]
In order to eliminate such problems, the degassing process is generally performed in the molten metal holding furnace. In addition to the degassing process in the molten metal holding furnace, the degassing process is performed before the molten metal is supplied to the molten metal holding furnace. (For example, refer to Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent No. 3194418 (2-3 pages, FIG. 1)
[0005]
FIG. 6 is a reprint of FIG. 1 of Patent Document 1, wherein 1 is a funnel, 4 is a storage section, 4a is a storage section bottom surface, 5 is a hot water supply section, 6 is an outlet, and 7 is an inert gas supply means. .
[0006]
The funnel 1 is a kind of auxiliary part used when the molten metal is transferred from the ladle into the molten metal holding furnace, and an inert gas supply means 7 is provided in the vicinity of the boundary between the storage unit 4 and the hot water distribution unit 5. Prepare. This supply means 7 is made close to the bottom surface 4a of the storage part 4 and is constituted by a porous plug.
[0007]
[Problems to be solved by the invention]
In Patent Document 1, a funnel 1 is purposely interposed between a molten metal holding furnace and a ladle, and a large amount of air is involved when the molten metal is transferred from the ladle to the funnel 1.
[0008]
Moreover, since the installation position of the inert gas supply means 7 is provided in the site | part close | similar to the outflow port 6, it will become a cause of clogging, if a hot water run is not fully performed after discharge of a molten metal. In order to avoid this problem, it is conceivable to always discharge an inert gas. In this case, however, a problem of an increase in production cost due to waste of gas occurs.
[0009]
Therefore, an object of the present invention is to prevent clogging of the inert gas supply means and enhance the discharge effect of the inert gas, reduce mixing of hydrogen gas generated from water vapor into the molten metal holding furnace, and cast product The purpose is to provide a ladle that contributes to the improvement of quality.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, claim 1 is a ladle for transporting molten metal melted in an aluminum melting furnace to a molten metal holding furnace attached to a casting machine, and into the molten metal discharge port for discharging the molten metal. In a ladle equipped with an inert gas supply nozzle for injecting an inert gas,
The inert gas supply nozzle is inserted from above into the molten metal passage toward the molten metal discharge port,
The distal end surface of the inert gas supply nozzles, with respect to the bottom surface of the molten metal passage towards the molten metal discharge port, characterized in that it is configure so that the rising gradient towards the molten metal discharge port.
[0011]
The ladle is a device that collects a required amount of molten metal from a melting furnace and transfers the molten metal to a molten metal holding furnace. When pouring the molten metal into the molten metal holding furnace, measures against hydrogen gas are taken by injecting an inert gas into the molten metal from an inert gas supply nozzle provided in the ladle near the molten metal discharge port of the ladle.
[0012]
The inert gas supply nozzle is inserted into the molten metal passage toward the molten metal discharge port from above , and the tip end surface of the nozzle rises toward the molten metal discharge port with respect to the bottom surface of the molten metal channel toward the molten metal discharge port of the ladle. It was configured to be a gradient.
Since the tip surface faces the melt discharge port, the melt does not directly collide with the tip surface of the inert gas supply nozzle. As a result, there is no fear that the tip of the inert gas supply nozzle is clogged with the molten metal.
[0013]
In addition, since the tip side faces the molten metal discharge port, the inert gas acts to push the molten metal to the molten metal discharge port, and particularly remains at the molten metal discharge port at the end of pouring from the ladle to the molten metal holding furnace. The molten metal can be effectively extruded into the molten metal holding furnace with the flow of gas, and the hotness of the ladle can be improved.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
[0015]
Before explaining the structure of the ladle, an example of using the ladle will be explained.
FIG. 1 is a diagram showing an example of use of a ladle according to the present invention, and a ladle 30 is necessary because the casting machine 20 is installed at a certain distance from the aluminum melting furnace 10. That is, the ladle 30 is made to face the outlet 11 of the aluminum melting furnace 10 to receive the molten aluminum. The ladle 30 is moved by the action of the robot arm 25 as indicated by arrows {circle around (1)} and {circle around (2)} and faces the molten metal holding furnace 40 attached to the casting machine 20.
[0016]
The lid 41 of the molten metal holding furnace 40 is opened, the ladle 30 is tilted by the robot arm 25, and the molten metal is injected into the molten metal holding furnace 40.
In the molten metal holding furnace 40, the molten metal is pushed down by blowing an inert gas from the pressurizing port 42, and the molten metal is supplied to the mold 44 through the stalk 43 by this action. Since the molten metal stored in the molten metal holding furnace 40 is reduced by repeating the casting, it is necessary to replenish the molten metal using the ladle 30 as appropriate.
[0017]
FIG. 2 is a sectional view of a ladle according to the present invention. A ladle 30 includes a ladle body 31, a molten metal discharge port 32 provided in the ladle main body 31, and an inert gas provided in the vicinity of the molten metal discharge port 32. And a supply nozzle 33. The refractory lining was omitted.
However, the inert gas supply nozzle 33 is configured such that the tip surface 36 of the nozzle is inclined upward toward the molten metal discharge port 32 with respect to the bottom surface 35 of the molten metal passage 34 facing the molten metal discharge port 32. That is, the angle θ formed by the tip surface 36 and the bottom surface 35 of the nozzle is set to 10 ° or more, preferably 30 ° to 60 °.
[0018]
When the angle θ is less than 10 °, the molten metal easily enters the tip of the nozzle. Considering mounting errors and tilting movement of the ladle, it is desirable to make it 30 ° or more for safety. However, when the angle θ exceeds 60 °, the flow of the molten metal and the flow of the blown-out gas are approximated, so that it is difficult for the gas to mix with the molten metal. Therefore, the angle θ falls within the range of 30 ° to 60 °.
[0019]
FIG. 3 is a front view of a ladle according to the present invention. A ladle body 31 of the ladle 30 is attached to the first robot arm 22 via bearings 26 and 27 by a connecting shaft 21, and the connecting shaft 21 is connected to a motor. Rotate at 28. As a result, the ladle 30 can be freely tilted around the connecting shaft 21 in FIG.
[0020]
Next, the operation of the ladle having the above configuration will be described.
FIG. 4 is an operation explanatory view of the inert gas supply nozzle according to the present invention. (A) shows a comparative example, (b) shows an example.
In the comparative example (a), the inert gas supply nozzle 101 is disposed at right angles to the bottom surface 103 of the molten metal passage 102. Although the molten metal flows as indicated by the arrow (3), a part of the molten metal may enter the tip of the inert gas supply nozzle 101 as indicated by the arrow (4) and the tip may be clogged.
[0021]
In the embodiment of (b), the nozzle tip surface 36 is installed so as to be inclined upward toward the melt discharge port 32 with respect to the bottom surface 35 of the melt passage 34. Even when the molten metal flows as indicated by the arrow (5) and a part of the molten metal flows upward as indicated by the arrow (6), the nozzle tip surface 36 is inclined, so that it enters the tip of the inert gas supply nozzle 33. There is no worry to do. As a result, the inert gas can be stably supplied to the molten metal over a long period of time.
[0022]
FIG. 5 is a diagram showing another embodiment of the inert gas supply nozzle according to the present invention.
(A) is an example in which the inert gas supply nozzle 33 is installed at a right angle to the bottom surface 35 and facing downward, and the inert gas supply nozzle 33 is cut into a so-called “lotus” and the tip of the nozzle obtained. The surface 36 was directed to the molten metal discharge port 32. As a result, the nozzle tip surface 36 has an upward slope toward the molten metal discharge port 32 with respect to the bottom surface 35 of the molten metal passage 34.
[0023]
In FIG. 2, it is necessary to attach the inert gas supply nozzle 33 at an angle, and attention is required for attaching the inert gas supply nozzle 33 to the ladle 30. In this respect, in this alternative embodiment, the inert gas supply nozzle 33 can be disposed at a right angle to the bottom surface 35. Therefore, the attachment of the inert gas supply nozzle 33 to the ladle 30 is simplified, and Manufacturing cost can be reduced.
[0024]
In (b), the lower part of the inert gas supply nozzle 33 is curved, and the tip surface 36 of the nozzle is inclined upward toward the melt discharge port 32 with respect to the bottom surface 35 of the melt passage 34.
[0025]
In this alternative embodiment, it is not necessary to cut the tip of the inert gas supply nozzle 33 into a lot, but it can be simply bent. In FIG. 2, it is necessary to attach the inert gas supply nozzle 33 at an angle, and attention is required for attaching the inert gas supply nozzle 33 to the ladle 30. In this respect, in this alternative embodiment, the inert gas supply nozzle 33 can be attached to the bottom surface 35 at a right angle, so that the attachment of the inert gas supply nozzle 33 to the ladle 30 is simplified and the ladle 30 is manufactured. Cost can be reduced.
[0026]
As described above, the inert gas supply nozzle 33 is configured such that the nozzle tip surface 36 is inclined upward toward the molten metal discharge port 32 as shown in FIGS. 4B, 5 </ b> A, and 5 </ b> B. There is no worry that the molten metal enters the tip of the. Therefore, the inert gas can be stably supplied to the molten metal over a long period of time.
As a result, the ladle 30 enhances the discharge effect of the inert gas and sufficiently deaerates the molten metal, so that the quality of the cast product can be reduced and the quality can be improved.
[0027]
【Example】
Embodiments according to the present invention will now be described.
○ Casting inert gas supply nozzle of ladle used: Fig. 2 type inert gas supply time: 10 seconds Injection timing: From the start of tilting of the ladle to the stop of tilting.
Discharged inert gas amount: 800 cm ³
The amount of molten metal in the ladle: 22kg
Molten metal type: cast aluminum alloy (JIS AC4C)
[0028]
○ In the castings obtained under the conditions above the evaluation, the number of cavities is significantly higher than the castings manufactured using the ladle whose inert gas supply nozzle is the conventional mold {Fig. 4 (a)}. Diminished.
[0029]
The tip end surface 36 of the inert gas supply nozzle 33 may have any fine shape as long as it is configured to rise upward toward the molten metal discharge port 32 with respect to the bottom surface 35 of the molten metal passage 34. Further, the number of the inert gas supply nozzles 33 is not limited.
[0030]
Moreover, although the ladle 30 of the present invention is intended for handling molten aluminum alloy, the ladle 30 of the present invention may be applied to molten metal such as magnesium alloy, copper alloy, cast iron and the like.
[0031]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to claim 1, in the inert gas supply nozzle attached to the ladle, the tip surface of the inert gas supply nozzle has an upward slope toward the molten metal discharge port with respect to the bottom surface of the molten metal passage toward the molten metal discharge port. As described above, the inert gas supply nozzle is configured.
[0032]
Since the tip surface of the inert gas supply nozzle faces the melt discharge port, the melt does not directly collide with the tip surface of the inert gas supply nozzle. As a result, there is no fear that the tip of the inert gas supply nozzle is clogged with the molten metal.
[0033]
In addition, the inert gas supply nozzle has its tip end facing the molten metal discharge port, so the inert gas pushes the molten metal to the molten metal discharge port, especially at the end of pouring from the ladle to the molten metal holding furnace. The molten metal remaining at the molten metal discharge port can be effectively pushed out to the molten metal holding furnace by the flow of gas, and the hot water cutting property of the ladle can be enhanced.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of use of a ladle according to the present invention. FIG. 2 is a sectional view of the ladle according to the present invention. FIG. 3 is a front view of the ladle according to the present invention. FIG. 5 is a diagram illustrating another embodiment of the inert gas supply nozzle according to the present invention. FIG. 6 is a reprint of FIG. 1 of Patent Document 1.
DESCRIPTION OF SYMBOLS 10 ... Aluminum melting furnace, 20 ... Casting machine, 30 ... Ladle body, 31 ... Ladle main body, 32 ... Molten discharge port, 33 ... Inert gas supply nozzle, 34 ... Molten channel, 35 ... Bottom of molten metal channel, 36 ... Nozzle tip surface, 40 ... molten metal holding furnace.

Claims (1)

It is a ladle that transports the molten metal melted in the aluminum melting furnace to the molten metal holding furnace attached to the casting machine, and an inert gas supply nozzle that injects an inert gas into the molten metal at the molten metal discharge port for discharging the molten metal. In the prepared ladle,
The inert gas supply nozzle is inserted from above into the molten metal passage toward the molten metal discharge port,
Ladle distal end surface of the inert gas supply nozzles, with respect to the bottom surface of the molten metal passage towards the molten metal discharge port, characterized in that it is configure so that the rising gradient towards the molten metal discharge port.

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