JP2005034858A - Reduction casting method and reduction casting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reduction casting method and a reduction casting device capable of enabling favorable reduction casting by activating reducing compound. <P>SOLUTION: In the reduction casting method, a forming die 12 is set in a molten metal supply cylinder 20 provided in a molten metal supply tank 16, molten metal 18 stored in the molten metal supply tank 16 is pressurized and/or a cavity 12a in the forming die is evacuated, and the molten metal 18 is filled for casting from the molten metal supply cylinder 20 into the cavity 12a of the forming die. In addition, in this method, the forming die 12 is set in the molten metal supply cylinder 20, reducing compound 26 with the effect of reducing an oxide film deposited on the surface of the molten metal is supplied to the molten metal supply cylinder 20 or the cavity 12a. When the molten metal 18 is filled from the molten metal supply cylinder 20 into the cavity, the oxide film deposited on the surface of the molten metal 18 is cast while reducing the oxide film by the reducing compound in the molten metal supply cylinder 20 and the cavity 12a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reduction casting method and a reduction casting apparatus, and more particularly, to a reduction casting method and a reduction casting apparatus that perform casting by activating a reducing compound using thermal energy of a molten metal.
[0002]
[Prior art]
As a casting method that can be suitably used for casting aluminum or the like, the present applicant can improve the fluidity of the molten metal by causing a reducing compound such as magnesium nitrogen compound (Mg ₃ N ₂ ) to act on the molten metal. Have proposed a reduction casting method that enables simple casting (Patent Document 1, etc.).
In this reduction casting method, as a main method of causing the reducing compound to act on the molten metal, a metal gas (for example, magnesium gas) and a reactive gas (for example, nitrogen gas) are individually introduced into the cavity, After the reducing compound is generated, the molten compound is injected into the cavity to cause the reducing compound to act on the molten metal, and after the metal gas and the reactive gas are reacted in advance outside the mold to generate the reducing compound. There is a method in which a reducing compound is introduced into a cavity with a carrier gas or the like, and a molten compound is injected into the cavity to cause the reducing compound to act on the molten metal.
[0003]
The reduction casting method is a method in which a reducing compound is allowed to act on a molten metal to reduce and cast an oxide film formed on the surface of the molten metal. For example, an oxide film is formed on the surface of the molten metal such as aluminum or an aluminum alloy. It can be suitably used for casting with a metal that is easily formed. The action of reducing the oxide film (Al ₂ O ₃ ) formed on the molten aluminum surface by the magnesium nitrogen compound (Mg ₃ N ₂ ), which is a reducing compound, is due to the following chemical reaction.
Mg ₃ N ₂ + Al ₂ O ₃ → Al + MgO + N ₂
Although MgO remains in the molten metal, since it is a trace amount, it does not affect the properties of the cast product. N ₂ gas is discharged out of the cavity.
According to the reduction casting method, the fluidity of the molten metal becomes good, the hot water circulation property becomes good, and it is possible to easily obtain a high-quality cast product free from hot water wrinkles and the like.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-321918
[Problems to be solved by the invention]
When the above-described reduction casting method is applied to actual casting, it is important to allow the reducing compound to effectively act on the molten metal in order to achieve suitable reduction casting. The reducing compound is active at high temperatures and has a suitable reducing action on the molten metal. For this reason, it is preferable that the reducing compound deposited in the cavity is kept at a high temperature in the cavity, or the reducing compound produced in the reaction furnace is introduced into the cavity at a high temperature and cast.
[0006]
By the way, in the case of reduction casting, since the fluidity of the molten metal becomes good, it is possible to perform casting by lowering the mold temperature to about room temperature, thereby shortening the cycle time of casting and improving the production efficiency. It becomes possible. However, since the reactivity of the reducing compound decreases when the mold temperature is lowered, and the molten metal rapidly solidifies in the cavity, the oxide film on the molten metal surface is reduced by the reducing compound to ensure fluidity. However, there is a problem that it is difficult to adjust so as to ensure the filling property of the molten metal.
In addition, a high-temperature reactor is required to obtain a high-temperature reducing compound, or because the reducing compound is introduced into the mold cavity at a high temperature, it is necessary to consider the layout of the mold and the reactor. There was a problem that there was.
[0007]
Therefore, the present invention has been made to solve these problems, the purpose of which is to enable the reducing compound to effectively act on the molten metal without impairing the activity of the reducing compound, Accordingly, it is an object of the present invention to provide a reduction casting method and a reduction casting apparatus that enable suitable reduction casting.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention comprises the following arrangement.
That is, the mold is set in a hot water supply pipe provided in the hot water tank, the molten metal stored in the hot water tank is pressurized and / or the cavity in the mold is depressurized, and the mold is removed from the hot water pipe. In the casting method in which the molten metal is cast in the cavity, a reducing property having an action of reducing an oxide film formed on the surface of the molten metal in the hot water cylinder or the cavity after setting a molding die in the hot water cylinder. When a compound is supplied and molten metal is poured into the cavity from the hot water supply cylinder, the oxide film formed on the surface of the molten metal is cast while being reduced by the reducing compound in the hot water supply cylinder and the cavity. It is characterized by.
In the present invention, the supply of the reducing compound to the hot water supply pipe means that the reducing compound is supplied by injecting the reducing compound into the hot water supply pipe, and the reaction of a metal gas such as magnesium gas and nitrogen gas in the hot water supply pipe. And a method of generating and supplying a reducing compound by reacting with a reactive gas.
Further, since the hot water supply cylinder and the cavity are in communication with each other, the reducing compound may be injected into the hot water supply pipe or into the cavity. In either case, the reducing compound diffuses in both the hot water supply cylinder and the cavity.
[0009]
In addition, after setting the mold in the hot water supply cylinder, the hot water supply cylinder and the cavity are made non-oxidizing atmosphere, and then a reducing compound is introduced into the hot water supply cylinder, or a reducing compound is generated in the hot water supply cylinder. It is characterized by that. As a method for making the hot water supply cylinder and the cavity into a non-oxidizing atmosphere, there are a method of sucking the hot water supply pipe and the cavity in a vacuum, a method of purging the hot water supply cylinder and the cavity with an inert gas such as argon gas, and the like. .
Further, a method of casting using a molten metal of aluminum or an aluminum alloy as the molten metal and using a magnesium nitrogen compound as the reducing compound is a preferable method as a reducing casting method using the reducing compound.
[0010]
In addition, a mold is set in a hot water cylinder provided in the hot water tank, and the molten metal stored in the hot water tank is pressurized and / or the cavity in the mold is depressurized, whereby the molten metal is transferred from the hot water cylinder to the cavity. In the casting apparatus for filling and casting, there is provided a supply mechanism for supplying a reducing compound that reduces the oxide film formed on the surface of the molten metal into the hot water supply cylinder or the cavity, and the supply mechanism provides the inside of the hot water supply cylinder. After the reducing compound is supplied to the metal, when the molten metal is poured into the cavity from the hot water supply cylinder, the oxide film formed on the surface of the molten metal can be cast while reducing with the reducing compound in the hot water supply cylinder and the cavity. It is characterized by being provided in.
[0011]
Further, a plurality of the reduction casting apparatuses are provided in communication with a common hot water supply furnace for storing molten metal, and the liquid level of the molten metal in the pouring stroke provided in each of the reduction casting apparatuses is provided in the hot water supply furnace. A liquid level adjusting mechanism for controlling is provided. The liquid level adjusting mechanism can control the position of the liquid level in the pouring stroke provided in each reduction casting apparatus to a position where the reducing compound can be supplied in the pouring stroke.
Further, as a reducing compound supply mechanism, a reducing compound supply unit is provided in communication with the hot water supply cylinder, and the reducing compound is supplied from the supply unit by injecting the reducing compound into the hot water supply cylinder using a gas pressure. A gas cylinder of gas is provided in communication with the container.
Further, as the reducing compound supply mechanism, the molding die is provided with an injection path that communicates the reducing compound supply section and the cavity, and the molding path communicates with the injection path and the cavity at the retracted position. A movable core for shielding the injection path at a position is provided.
Further, by storing a molten aluminum or aluminum alloy in the hot water tank and using a magnesium nitrogen compound as the reducing compound, it can be suitably used for casting aluminum or aluminum alloy.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory diagram showing the overall configuration of a casting apparatus 10 according to the present invention. The casting apparatus 10 of this embodiment is used for aluminum casting by LPD (low pressure die casting).
In FIG. 1, 12 is a mold, and 12 a is a cavity provided in the mold 12. Reference numeral 14 denotes a vacuum suction device provided in communication with the cavity 12a. Reference numeral 16 denotes a hot water supply tank for the molten metal 18, and reference numeral 20 denotes a hot water supply pipe for connecting the hot water supply tank 16 and the mold 12. In the LPD device, the mold 12 is disposed above the hot water tank 16 and pressure is applied to the molten metal 18 in the hot water tank 16 so that the molten metal 18 stored in the hot water tank 16 via the hot water cylinder 20 is cavity. 12a is filled and cast. It is also possible to use a method in which vacuum suction is performed from the vacuum suction device 14, the inside of the cavity 12a is decompressed, and the molten metal 18 is filled into the cavity 12a from the hot water supply cylinder 20.
[0013]
The characteristic feature of the casting apparatus 10 of this embodiment is that a supply mechanism for supplying a reducing compound (magnesium nitrogen compound: Mg ₃ N ₂ ) is connected to the hot water supply cylinder 20 that communicates the hot water tank 16 and the cavity 12a. In addition, the reducing compound supplied to the hot water supply cylinder 20 is cast by being heated by the heat of the molten metal 18.
Reference numeral 22 denotes a seal mechanism provided in communication with the hot water supply cylinder 20 formed in a cylindrical shape. A cylinder 22a is connected to the side wall of the hot water supply cylinder 20, and 22b is a seal plunger. A container 28 containing a reducing compound 26 communicates with the seal mechanism 22 via a pipe 24, and the container 28 is connected to an argon gas cylinder 34 via a valve 30 and a pipe 32. The seal mechanism 22 and the pipe 32 are connected by a pipe 36 via a valve 38. The sealing mechanism 22, the argon gas cylinder 34, the valves 30 and 38, the pipes 24 and 32, etc. constitute a supply mechanism that supplies the reducing compound to the hot water supply cylinder 20.
[0014]
The casting operation using the casting apparatus 10 of the present embodiment is performed as follows.
First, the mold 12 is set in the hot water supply cylinder 20, and air is exhausted from the cavity 12 a by the vacuum suction device 14. At this time, the sealing mechanism 22 is opened, the valve 38 is opened, and argon gas is fed from the argon gas cylinder 34 into the hot water supply cylinder 20. As a result, the inside of the hot water supply cylinder 20 and the cavity 12a are filled with argon gas, and the inside of the hot water supply cylinder 20 and the cavity 12a becomes a non-oxidizing atmosphere. It is possible to purge the hot water supply cylinder 20 and the air in the cavity 12a with argon gas without using the vacuum suction device 14, but it is more efficient to use the vacuum suction device 14.
After the hot water supply cylinder 20 and the cavity 12a are filled with argon gas, the valve 38 is closed.
[0015]
Next, the reducing compound 26 is introduced into the hot water supply cylinder 20. The reducing compound 26 opens the valve 30 and is sent out from the container 28 to the sealing mechanism 22 using the argon gas pressure of the argon gas cylinder 34 and is injected into the hot water supply cylinder 20 using the argon gas pressure. The container 28 may contain an amount of the reducing compound 26 to be used in one injection using the argon gas pressure.
By injecting the reducing compound 26 into the hot water supply cylinder 20 using the argon gas pressure, the reducing compound 26 fills the hot water supply cylinder 20 and is also fed into the cavity 12 a of the mold 12.
[0016]
By injecting the reducing compound 26 into the hot water supply cylinder 20 using the argon gas pressure, the reducing compound 26 becomes gaseous and fills the hot water supply pipe 20 and is stored in the hot water tank 16. It is easily heated by the heat of the molten metal 18. Further, the reducing compound 26 fed into the hot water supply cylinder 20 also enters the cavity 12 a of the mold 12. In the hot water tank 16, the molten aluminum 18 is heated to about 740 ° C.
[0017]
After the reducing compound 26 is injected from the container 28 to the hot water supply cylinder 20 using the argon gas pressure, the valve 30 is closed, the seal plunger 22b is advanced, and the seal mechanism 22 is closed. When the seal plunger 22b is moved forward, the valve 38 is opened, argon gas is fed into the cylinder 22a, and the seal plunger 22b is moved while cleaning the reducing compound 26 remaining in the cylinder 22a. Good.
[0018]
FIG. 2 shows a state where pressure is applied to the molten aluminum 18 stored in the hot water tank 16 with the seal mechanism 22 closed, and the molten aluminum 18 is pushed up into the hot water cylinder 20.
As described above, the reducing compound (magnesium nitrogen compound: Mg ₃ N ₂ ) 26 supplied to the hot water supply cylinder 20 is heated in the hot water supply cylinder 20 by the heat of the molten aluminum 18 and is sufficiently activated. It has become. Accordingly, the reducing compound 26 effectively acts on the molten aluminum 18 pushed up in the hot water supply cylinder 20, and the oxide film formed on the surface of the molten aluminum 18 can be effectively reduced. . As a result, the fluidity of the molten metal 18 filled in the cavity 12a from the hot water supply cylinder 20 becomes good, and the molten aluminum 18 is injected into the cavity 12a in a state of high fluidity.
[0019]
A part of the reducing compound 26 supplied to the hot water supply cylinder 20 has a reducing action with the molten aluminum 18 in the hot water supply cylinder 20, but the rest is sent to the cavity 12 a so as to be pushed by the molten aluminum 18. Entered.
The reducing compound 26 previously fed into the cavity 12 a is activated by being heated by the heat of the molten aluminum 18, and the reducing compound 26 fed into the cavity 12 a together with the molten aluminum 18 from the hot water supply cylinder 20. Since the compound 26 is also in an activated state, when the cavity 12a is filled with the molten aluminum 18, the reducing action by the reducing compound 26 is sufficient, and the fluidity of the molten aluminum 18 is sufficient. Thus, it is possible to fill the cavity 12a with the molten metal 18.
[0020]
In the case of the casting apparatus 10 of the present embodiment, the reducing compound (magnesium nitrogen compound: Mg ₃ N ₂ ) 26 is heated in the hot water supply cylinder 20 immediately before the molten metal 18 is injected into the cavity 12a. Since it is in an activated state, it has a layout that functions most effectively as an action of the reducing compound 26 used for the purpose of improving the fluidity of the molten metal 18, and the reducing compound 26 is also used in the cavity 12 a. The reduction action of is effective.
Therefore, by providing the mold 12 as a coating-less and lowering the mold temperature by water cooling or applying a surface treatment with good thermal conductivity, a casting method capable of high-speed solidification without deteriorating the quality of the cast product is provided. It becomes possible.
[0021]
As described above, in the casting apparatus of the present embodiment, the reducing compound 26 is activated by utilizing the heat of the molten metal 18 stored in the hot water tank 16, and it is not necessary to use a special heat source, thus saving energy. This is also useful in that it can be achieved.
In the above-described embodiment, an existing reducing compound 26 such as a magnesium nitrogen compound is stored in the container 28, and the reducing compound 26 is supplied to the hot water supply cylinder 20 using the argon gas pressure. The method for supplying the reducing compound to the hot water supply cylinder 20 is not limited to the above method.
[0022]
For example, a reducing compound produced by reacting a metal gas such as magnesium gas and a reactive gas such as nitrogen gas outside the hot water supply tube 20 can be supplied to the hot water supply tube 20. It is also possible to introduce magnesium and nitrogen gas into the cylinder 20 to produce a reducing compound inside the hot water supply cylinder 20. Magnesium metal is sublimated at 700 ° C. to 850 ° C. to become magnesium gas. Therefore, it is possible to generate magnesium gas inside the hot water supply cylinder 20, and it is also possible to generate a magnesium nitrogen compound inside the hot water supply cylinder 20.
[0023]
FIG. 3 is an explanatory view showing a second embodiment of the casting apparatus according to the present invention. In the first embodiment, the seal mechanism 22 is provided in the hot water supply cylinder 20 and the reducing compound is introduced into the hot water supply cylinder 20 and the cavity 12a, whereas in this embodiment, the movable mold provided in the mold 12 is provided. A reducing compound 26 is injected into the cavity 12 a and the hot water supply cylinder 20 using the core 23. 12 b is an injection path for injecting the reducing compound provided in the mold 12. The injection path 12b communicates with a container 28 containing a reducing compound 26 provided outside the mold 12 on the outer end side. On the inner side of the mold 12, the cavity 12a is in a state where the movable core 23 is in the retracted position. It is provided so as to open at a position communicating with the.
[0024]
FIG. 3A shows a state in which the reducing compound 26 is introduced into the cavity 12a and the hot water supply cylinder 20 with the movable core 23 in the retracted position (retracted position).
FIG. 3B shows a state in which the movable core 23 is moved to the protruding position, the injection path 12 b is closed, and the molten metal 18 is filled into the cavity 12 a from the hot water supply cylinder 20. As described above, by using the movable core 23 and the injection path 12 b provided in the mold 12, the reducing compound 26 can be introduced into the cavity 12 a and the hot water supply cylinder 20, and reduced by the heat of the molten metal 18. The active compound 26 can be activated for reduction casting.
[0025]
Also in this embodiment, instead of injecting the reducing compound 26 into the cavity 12a and the hot water supply cylinder 20, the cavity 12a and the hot water supply cylinder 20 are separately supplied with a metal gas such as magnesium gas and a reactive gas such as nitrogen gas. It is also possible to inject it into the cavity 12 and generate a reducing compound in the cavity 12 a and the hot water supply cylinder 20 to perform reduction casting.
[0026]
4 and 5 show an example of a casting apparatus in which a plurality of reduction casting apparatuses are connected to a hot water supply furnace 40 as a system as an example of using a reduction casting method in which a reducing compound is supplied to the hot water supply cylinder 20 for casting.
As shown in FIG. 4, in the present embodiment, three casting apparatuses 10 a, 10 b, 10 c are connected to a hot water furnace 40. Of course, the number of connected casting apparatuses connected to the hot water furnace 40 is not limited. Reference numeral 42 denotes a connecting pipe that connects the hot water furnace 40 and the hot water tank 16 of the casting apparatus, and 44 denotes a filter.
[0027]
FIG. 5 shows an internal structure in a state where the casting apparatuses 10 a and 10 c are connected to the hot water furnace 40. Since the hot water furnace 40 and the casting apparatuses 10a, 10b, and 10c communicate with each other, the liquid level of the molten metal 18 in the hot water furnace 40 and the molten metal 18 in the hot water tank 16 of each of the casting apparatuses 10a, 10b, and 10c are normally used. The height of the liquid level is the same.
In the case of the method of supplying the reducing compound 26 to the hot water supply cylinder 20 shown in FIGS. 1 and 2 and performing reduction casting, it is necessary to secure a space for introducing the reducing compound 26 into the hot water supply cylinder 20. . For this reason, in this embodiment, the liquid level adjustment mechanism 50 is provided in the hot water supply furnace 40, and it is comprised so that the liquid level of the molten metal in the hot water supply tank 16 of casting apparatus 10a, 10b, 10c may be adjusted. The liquid level adjusting mechanism 50 in this embodiment is provided with a liquid level adjusting plunger 46 so as to be able to protrude into the hot water supply furnace 40, and a drive piston 48 for allowing the liquid level adjusting plunger 46 to protrude. .
[0028]
Also in the case of casting with the casting apparatus of the present embodiment, as in the case of casting with the casting apparatus 10 described above, after the reducing compound 26 is introduced into the hot water supply cylinder 20 of each casting apparatus 10a, 10b, 10c, Casting is performed by filling the cavity 12 a with the molten metal 18 through 20.
In each of the casting apparatuses 10a, 10b, and 10c, similar to the casting apparatus 10 described above, the reducing compound 26 is activated in the hot water supply cylinder 20, and the reducing compound 26 suitably acts on the molten metal to achieve good reduction. Casting is performed, and a high-quality cast product can be obtained.
[0029]
Further, in the case of the casting apparatus of the present embodiment, even when the mold temperature is lowered by cooling the molding die 12 with water or the like, the reducing action by the reducing compound is reliably ensured. However, the fluidity of the molten metal is maintained, a good casting can be obtained, and a high-speed reduction casting system can be configured. Further, by connecting a plurality of casting apparatuses to the hot water furnace 40, the production efficiency can be further increased. In addition, the casting apparatus connected to the hot water furnace 40 is not limited to the one used for manufacturing the same product, and can be configured to cast different types of cast products.
[0030]
4 and 5, an example of a casting apparatus that introduces the reducing compound 26 into the hot water supply cylinder 20 and performs reduction casting has been described as an example. However, instead of introducing the reducing compound into the hot water supply cylinder 20 as shown in FIG. The same applies to the case of reducing casting by introducing the reducing compound 26 into 12a.
In the above embodiment, casting using aluminum or an aluminum alloy has been described as an example. However, the present invention can also be applied to reduction casting of metals other than aluminum.
[0031]
【The invention's effect】
According to the reduction casting method and the reduction casting apparatus according to the present invention, as described above, after supplying the reducing compound to the hot water supply cylinder or the cavity of the mold, the molten metal is injected from the hot water supply cylinder into the cavity and cast. The reducing compound is heated and activated by the heat of the molten metal in the hot water supply cylinder, and the oxide film formed on the surface of the molten metal injected into the cavity can be effectively reduced, improving the fluidity of the molten metal. This makes it possible to perform hot casting and to perform high-quality reduction casting. In addition, since the fluidity of the molten metal becomes good, it is possible to cast the molten metal at a high speed by lowering the mold temperature, which enables efficient and high quality casting. In addition, since the reducing compound is heated in the hot water supply cylinder, it is not necessary to prepare a separate heating furnace for heating the reducing compound, which can save energy and facilitate the layout of the mold. It has a remarkable effect.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a configuration of a first embodiment of a reduction casting apparatus according to the present invention.
FIG. 2 is an explanatory view showing a casting state by a reduction casting apparatus.
FIG. 3 is an explanatory view showing a configuration and a casting method of a second embodiment of a reduction casting apparatus according to the present invention.
FIG. 4 is an explanatory view showing a planar arrangement of a casting apparatus in which a plurality of reduction casting apparatuses are connected.
FIG. 5 is an explanatory diagram showing an internal configuration of a casting apparatus in which a plurality of reduction casting apparatuses are connected.
[Explanation of symbols]
10, 10a, 10b, 10c Casting device 12 Mold 12a Cavity 14 Vacuum suction device 16 Hot water tank 18 Molten metal 20 Hot water supply tube 22 Seal mechanism 22b Seal plunger 26 Reducing compound 34 Argon gas cylinder 40 Hot water furnace 50 Liquid level adjustment mechanism

Claims (8)

A mold is set in a hot water pipe provided in a hot water tank, and the molten metal stored in the hot water tank is pressurized and / or the cavity in the mold is depressurized, so that the hot water pipe is transferred to the mold cavity. In a casting method in which molten metal is filled and cast,
After setting the mold in the hot water cylinder,
Supplying a reducing compound having an action of reducing an oxide film formed on the surface of the molten metal to the hot water supply cylinder or the cavity;
When the molten metal is poured into the cavity from the hot water supply cylinder, the reduction film is cast while reducing the oxide film formed on the surface of the molten metal with the reducing compound in the hot water supply cylinder and in the cavity. Casting method. After setting the mold in the hot water supply tube, the hot water supply tube and the cavity are made non-oxidizing atmosphere,
The reducing casting method according to claim 1, wherein the reducing compound is introduced into the hot water supply cylinder or the reducing compound is generated in the hot water supply cylinder. Use molten metal of aluminum or aluminum alloy as the molten metal,
The reduction casting method according to claim 1 or 2, wherein a magnesium nitrogen compound is used as the reducing compound for casting. The mold is set in a hot water supply pipe provided in the hot water tank, and the molten metal stored in the hot water tank is pressurized and / or the cavity in the mold is reduced to fill the cavity from the hot water pipe. In a casting apparatus for casting,
A supply mechanism is provided for supplying a reducing compound that reduces the oxide film formed on the surface of the molten metal into the hot water supply cylinder or the cavity;
After the reducing compound is supplied into the hot water cylinder by the supply mechanism, the oxide film formed on the surface of the molten metal in the hot water cylinder and the cavity is reduced when the molten metal is injected into the cavity from the hot water cylinder. A reduction casting apparatus characterized in that it can be cast while being reduced by a functional compound. A plurality of reduction casting apparatuses according to claim 4 are provided in communication with a common hot water furnace for storing molten metal,
A reduction casting apparatus, wherein the hot water furnace is provided with a liquid level adjusting mechanism for controlling a liquid level of a molten metal in a pouring stroke provided in each reduction casting apparatus. As a reducing compound supply mechanism, a reducing compound supply unit is provided in communication with the hot water supply cylinder,
6. A gas cylinder of an inert gas, which is supplied by injecting a reducing compound from the supply unit into a hot water supply cylinder using a gas pressure, is provided in communication with the container. Reduction casting equipment. As the reducing compound supply mechanism, the mold is provided with an injection path for communicating the reducing compound supply section and the cavity,
6. The reduction casting apparatus according to claim 4, wherein the molding die is provided with a movable core in which the injection path and the cavity communicate with each other at the retracted position and the injection path is shielded at the protruding position. The molten metal of aluminum or aluminum alloy is stored in a hot water tank, and magnesium nitrogen compound is used as a reducing compound, and is used for casting of aluminum or aluminum alloy. Reduction casting equipment.

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