JP2003010947A - Casting method and device, ingot and metal product manufactured using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a casting device capable of forming a strong oxide film on the surface of a brass ingot. SOLUTION: The casting device is constituted by providing a mold 12 wherein a casting chamber 13 pierced in the vertical direction is formed, and a molten metal 14 is made to flow continuously in the casting room 13, a lubricant discharge part 15 which is opened facing the apex of the molten metal 14 in the casting chamber 13, and from which a lubricant is discharged, a carbon ring 16 which is annularly disposed over a predetermined length in the descending direction of the molten metal 14 in the inner periphery of the mold 12, and from which a gas is discharged, a gas feeding path 17 which is opened facing the carbon ring 16, and through which the gas to be fed to the carbon ring 16 is made to flow, and a holding member which holds a solidified ingot 23 continuously falling from the casting chamber 13 of the mold 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casting method and apparatus, and an ingot and a metal product manufactured by using the casting method and apparatus, and more particularly to a technique effective when applied to the formation of an oxide film on the surface of the cast metal. is there.

[0002]

2. Description of the Related Art Continuous casting is widely used as a technique for producing metal rods. By this continuous casting, metal rods made of various materials such as copper alloy, aluminum, steel, stainless steel, and magnesium are manufactured.

Here, a conventional casting apparatus will be described.

FIG. 10 is a schematic view showing an example of a conventional casting apparatus.

The casting apparatus shown in FIG. 10 is equipped with a mold 112 having a casting chamber penetrating vertically.
A molten metal receiver 111 is arranged above the mold 112. A float 123, which is a pool of molten metal, floats in the casting chamber of the mold 112. And the molten metal receiver 11
By continuously pouring the molten metal 114 in 1 through the float 123 into the casting chamber, the inflow amount of the molten metal 114 into the casting chamber is automatically adjusted.

Below the mold 112, a bottom block 120 for holding the solidified molten metal 114 continuously descending from the casting chamber is arranged.

A cooling water channel 118 is provided in the mold 112.
Is formed in the lower part of the mold 112, and the cooling water is discharged toward the ingot 23 discharged from the casting chamber.
19 is formed.

[0008]

However, in such a casting apparatus, not only is the life of the float short and processing is difficult, but since the molten metal is poured into the float, the metal that floats due to turbulent flow of the molten metal. The oxide and gas of No. 1 were entrapped inside the ingot, and surface cracks occurred due to the molten metal sticking to the mold surface, causing rough casting surface.

Therefore, in the case of a rough cast surface, the manufactured ingot needs a cutting step of cutting the outer periphery by a predetermined thickness. Furthermore, the step of heating the cut product,
The process of extruding the heated product was needed.

In the case of a metal, such as aluminum, on which a strong oxide film is easily formed, the roughening of the casting surface is relatively gentle because the metal is protected by the oxide film, but a metal such as brass has a strong oxide film. Since it is difficult to form, the casting surface is rough, and sometimes the molten metal solidified during casting adheres to the inner wall of the mold and cannot descend, causing a so-called hanging.

Therefore, an object of the present invention is to provide a technique capable of forming a strong oxide film on the surface of an ingot.

[0012]

In order to solve the above-mentioned problems, a casting method according to the present invention is a casting method in which a molten metal is continuously poured into a mold, and the molten metal is solidified while descending the molten metal. In the method, the lubricant is continuously supplied to the top of the molten metal in the mold, and the molten metal is supplied while continuously supplying gas through a member having air permeability over a predetermined length in the descending direction on the entire circumference of the side surface of the molten metal. Characterized by lowering.

Further, in the casting apparatus according to the present invention, a casting chamber penetrating in the vertical direction is formed, a mold in which molten metal is continuously poured into the casting chamber, and an opening facing the top of the molten metal in the casting chamber. And a lubricant discharge part for discharging the lubricant, and a gas discharge part which is arranged in an annular shape over a predetermined length in the descending direction of the molten metal on the inner circumference of the mold and which is formed of a breathable member and discharges the gas. And a gas supply path that opens toward the gas discharge part and through which the gas supplied to the gas discharge part flows, and a holding member that holds the solidified molten metal that continuously descends from the casting chamber of the mold And

According to such an invention, only a sufficient amount of gas is supplied to the side surface of the molten metal without being taken in, so that a strong oxide film is stably formed on the casting surface of the ingot. It will be possible.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings. Here, in the accompanying drawings, the same reference numerals are given to the same members,
Moreover, the duplicate description is omitted. It should be noted that the embodiment of the present invention is a particularly useful embodiment for carrying out the present invention, and the present invention is not limited to the embodiment.

FIG. 1 is a schematic view showing a casting apparatus which is an embodiment of the present invention, FIG. 2 is an explanatory view showing the flow of lubricant and gas in the casting apparatus of FIG. 1, and FIG. 3 is the casting of FIG. FIG. 4 is a graph showing the roughness of the casting surface in the ingot of brass produced by the apparatus and the three types of casting apparatuses examined by the present inventors.
Is a schematic diagram showing a casting apparatus of Study Example 1 which is the subject of study by the present inventor, FIG. 5 is a schematic diagram showing a casting apparatus of Study Example 2 which is the subject of study by the present inventor, and FIG. FIG. 7 is a schematic view showing the casting apparatus of Study Example 3 targeted, FIG. 7 is an explanatory view showing the flow of the lubricant and the gas in the casting apparatus of FIG. 6, and FIG. 8 is a view of the ingot obtained by the casting apparatus of FIG. 9 is a graph showing the analysis result of the surface composition, and FIG. 9 is a graph showing the analysis result of the surface composition of the ingot obtained by the casting apparatus of FIG.

In the following, first, the three types of casting apparatus that the present inventor examined will be described, and then the casting apparatus according to one embodiment of the present invention made by the present inventor will be described.

FIG. 4 shows a casting apparatus (study example 1).

In the illustrated casting apparatus, the float 1 described above is used.
No. 23 (FIG. 10) is not used, and a break ring 124 made of boron nitride, which provides good lubricity at high temperature, is arranged in the upper part of the casting chamber on the inner periphery of the mold 112. The ring 125 is arranged. Further, in order to crush the scratches generated on the side surface of the ingot 23, the bottom block 120 descends while swinging vertically.

However, even in such a casting apparatus, since the molten metal 114 that solidifies comes into contact with the inner wall surface of the mold 112 and the oxide film is damaged, the casting surface is roughened, so that the cutting step may not be omitted. Can not.

Further, in this casting apparatus, the zinc in the molten metal 114 ejected from the cracks of the lump of the molten metal 114 is the mold 1
12 adheres to the inner wall to form irregularities, which prevents the solidified molten metal 114 from descending smoothly. Therefore, a tear called so-called hanging may occur.

Next, a casting apparatus (study example 2) is shown in FIG.

This casting apparatus is a technique described in Japanese Patent Publication No. 54-42847, and as shown in FIG. 5, a gas discharge part 126 and a lubricant discharge part 127 for discharging gas and lubricant to the upper part of the casting chamber. And are formed in the mold 112.

In such a casting apparatus, the molten metal 114 descends and is solidified by the cooling water while the gas and the lubricant are introduced between the molten metal 114 and the mold 112.
The time during which the surface of 14 directly contacts the mold 112 is shortened. Therefore, in the case of a metal, such as aluminum, on which a strong oxide film is likely to be formed, the ingot 23 with less roughened casting surface can be obtained.

However, in a metal such as brass which does not form an oxide film as strong as aluminum, even if the contact time between the molten metal 114 and the mold 112 is short, the oxide film is damaged by the contact and the casting surface is roughened. Then, as described above, zinc in the alloy is ejected from the cracks of the solidified ingot 23 and adheres to the inner wall of the mold 112, and sometimes the ejected zinc causes the molten metal 114 and the mold 112 to adhere to each other, resulting in hanging. Will end up.

Further, FIG. 6 shows a casting apparatus (study example 3).

This casting apparatus is a technique described in Japanese Patent Publication No. 61-47622, and as shown in FIG. 6, a carbon ring 125 having air permeability is arranged on the inner periphery of the mold 112 in the upper part of the casting chamber. It is a thing. Then, in the mold 112, a lubricant supply path 128 through which the lubricant supplied to the carbon ring 125 flows, and a gas supply path 12 through which the gas supplied to the carbon ring 125 flows.
9 are opened downward facing the carbon ring 125, respectively. As a result, the gas and the lubricant exude from the fine holes of the carbon ring 125 and are supplied to the side surface of the molten metal 114.

According to this casting apparatus, the lubricity between the molten metal 114 and the mold 112 is improved, and the gas supply region is expanded to the thickness of the carbon ring 125 to increase the supply amount, thereby forming a more stable oxide film. Can be formed.

Therefore, the molten metal 1 of high temperature (about 900 ° C.)
Although the lubricant is vaporized due to 14 and gas is generated,
As described above, in the case of aluminum, a strong oxide film is likely to be formed, so that the oxide film is not damaged by the gas.

However, if a brass ingot 23 is manufactured using such a casting apparatus, it is disclosed in JP-A-2-63647.
Even if the oxygen concentration is increased as disclosed in the publication, an oxide film having sufficient strength is still not formed, so the oxide film is damaged by the gas taken into the side surface. Then, the cast surface still becomes rough like scales.

In the casting apparatus, as shown in FIG. 7, the lubricant reaches the side surface of the molten metal 114 through the pores of the carbon ring 125. The lubricant carbonizes in the ring 125 and causes clogging. Then carbon ring 125
The passing amount of the gas in the inside gradually decreases, the amount of gas supplied to the molten metal 114 becomes insufficient, and the strength of the oxide film itself decreases. That is, in the casting apparatus shown in FIG.
Gas cannot be continuously and stably supplied to the side surface of the.

As described above, the casting apparatus shown in FIG. 5 and the casting apparatus shown in FIG. 6 are effective for aluminum in which a strong oxide film is easily formed, but a strong oxide film such as brass is formed. When applied to a metal that is hard to be eroded, the oxide film is damaged and casting surface roughness occurs.

In order to solve such a problem, the inventor invented the casting apparatus shown in FIG.

In FIG. 1, a molten metal receiver 11 made of a heat insulating material is located above, and a mold 12 is located below it. A casting chamber 13 that penetrates the mold 12 in the vertical direction is formed, and a molten metal 14 is continuously poured into the casting chamber 13 from the molten metal receiver 11.

A lubricant discharge part 15 for discharging the lubricant is opened so as to face the top of the molten metal 14 poured into the casting chamber 13. Here, in the present embodiment, the lubricant discharge part 15 is formed by the melt receiver 11 and the mold 12, and the lubricant is discharged from between the melt receiver 11 and the mold 12. However, it may be formed on the molten metal receiver 11 side or the mold 12 side. Also, as long as the lubricant reaches the free surface of the molten metal 14 (the surface not in contact with the mold 12) so as to reach the entire circumference, preferably a plurality of radial holes extending in the radial direction. The shape of the discharge part 15 can be set freely.

A seal 22 is provided between the molten metal receiver 11 and the mold 12 to prevent leakage of the lubricant.

On the inner circumference of the mold 12, a carbon ring (gas discharge part) 16 made of a material having air permeability is arranged over a predetermined length in the descending direction of the molten metal 14. A gas supply path 17 through which the gas supplied to the carbon ring 16 flows is opened so as to face the carbon ring 16.

In the present embodiment, the carbon ring 16 is used as the annular gas discharge portion, but any member other than carbon may be used as long as it is a member having air permeability and heat resistance against the molten metal 14. May be formed. Although various gases such as an inert gas can be applied as the gas, it is preferable to use oxygen, preferably high-concentration oxygen.

Further, this mold 1 is used as the mold 12.
A flow path 18 through which cooling water for cooling 2 flows is formed. Further, a drain port 19 is formed which communicates with the flow path 18 and discharges the cooling water toward the ingot 23 discharged from the casting chamber 13.

The mold 1 is used in this embodiment.
Although 2 is a separate upper and lower body, they may be integrated.

Below the mold 12, a bottom block (holding member) 20 for holding the solidified molten metal 14 continuously descending from the casting chamber 13 of the mold 12 is installed by a bottom block mounting plate 21 so as to be vertically movable. There is.

Next, the casting operation by the casting apparatus of this embodiment having such a configuration will be described.

The molten metal 14 poured from the molten metal receiver 11 into the casting chamber 13 in the mold 12 is lowered while being solidified into a columnar shape in the casting chamber 13 to become an ingot 23 which is held by the bottom block 20 and taken out.

In such a casting process, as shown in detail in FIG. 2, the lubricant is supplied from the lubricant discharge portion 15 to the free surface which is the top of the molten metal 14 in the casting chamber 13. Then, due to the high temperature molten metal 14, a part of the lubricant is vaporized and gas is generated. However, since the lubricant is supplied to the top of the molten metal 14, this gas escapes downward without being caught in the side surface of the descending molten metal 14, and only the lubricant sufficient for the molten metal 14 to descend descends to the molten metal 14. It comes to be taken in between the mold 12.

As described above, the gas such as oxygen from the air-permeable carbon ring 16 has a predetermined length in the descending direction of the molten metal 14 (carbon ring) along the entire circumference of the side surface of the molten metal 14 in which the lubricant is taken in and smoothly descends. 16 thicknesses). As a result, a sufficient amount of gas is supplied to the side surface of the molten metal 14, so that a strong oxide film is formed without being damaged by the vaporized gas and the molten metal 1 is formed.
4 descends and solidifies.

Then, at this time, as in the above-described casting apparatus (FIG. 6) examined by the present inventor, the lubricant was used as the carbon ring 1.
Since it is not supplied from 6, the lubricant is not carbonized in the carbon ring 16 to cause clogging.

In this way, the casting chamber 13 of the mold 12 is
The solidified ingot 23 descending from the bottom block 20
Is held and taken out.

Here, the present inventor conducted the following test using the casting apparatus of the present application.

Pressurized oxygen of 99.9% by volume was used as the gas, and the lubricant was quantitatively supplied with the gap of the lubricant discharge portion 15 set to 0.1 mm, and 60/40 brass (JIS C377) was used.
1) The alloy was continuously cast 10 times. Casting rod diameter is 50mm,
Casting speed is 800 mm / min, cooling water volume is 70 L / m
in, lubricating oil (lubricant) is mineral oil, lubricating oil flow rate is 1.4
mL / min, gas flow rate was 0.4 L / min, casting temperature was 940 ° C., and casting length was 1000 mm.

From this casting test, an ingot having a film-like casting surface without cracks or wrinkles was obtained from the start to the end of casting. The surface roughness was 0.04 mm on average.
The carbon ring 16 was not clogged even after 10 times of casting, and a high-quality ingot was stably obtained.

FIG. 3 shows the surface roughness of the ingot 23 of brass and the surface roughness of the ingot 23 of brass produced by the above-described three types of casting devices (study examples 1 to 3).

As shown in the figure, the ingot 23 produced by the casting apparatus of this embodiment is the best in terms of both average roughness and maximum roughness. From this, the superiority of the casting apparatus of the present embodiment can be seen.

As described above, according to this embodiment, since the lubricant is supplied from the upper portion of the mold 12, the lubricant reaches the top of the molten metal 14 in the mold 12. Therefore, the vaporized gas escapes downward, and only the lubricant is taken in between the molten metal 14 and the mold 12. Further, only the gas is supplied from the carbon ring 16 to the entire circumference of the side surface of the molten metal 14. Therefore, a strong oxide film is formed on the side surface of the molten metal 14 by a sufficient amount of gas without being damaged by the vaporized gas. Then, the lubricant is used as the carbon ring 16
Since it is not exuded from the inside, the lubricant is not carbonized in the carbon ring 16 to cause clogging, and the gas is continuously and stably supplied to the side surface of the molten metal 14.

As a result, a strong oxide film can be stably formed on the casting surface of the ingot 23. Since such a strong oxide film is formed, the ingot 2
The roughening of the casting surface of No. 3 is alleviated, and the cutting process can be eliminated.

Further, since a strong oxide film is formed and is not damaged, the zinc contained in the ingot 23 is contained, so that the zinc does not adhere to the inner wall of the mold 12 to form irregularities.

It should be noted that oxygen is used as the gas, and particularly high-concentration oxygen (for example, 50 to 100% by volume, preferably 80 to 1) is used.
(00% by volume), the oxide film formed becomes stronger and the ingot 23 with less roughened casting surface can be obtained.

Here, the present inventor analyzed the surface composition of the ingot obtained by the casting apparatus of the present embodiment and the ingot obtained by the casting apparatus of Study Example 2 described above.

Specifically, an ingot was manufactured using JIS C3771 as a sample, and the difference in surface composition at the same site was analyzed by using an analyzer (manufactured by Shimadzu Corporation, fine X-ray photoelectron spectroscopy analyzer ESCA-1000). It was investigated by Auger electron spectroscopy. Table 1 shows a typical chemical composition of the test sample.

[0059]

[Table 1]

FIG. 8 shows the analysis result of the surface composition of the ingot obtained by the casting apparatus of this embodiment, and FIG. 9 shows the analysis result of the surface composition of the ingot obtained by the casting apparatus of Study Example 2. , Respectively.

According to the analysis result of the surface composition of the ingot obtained by the casting apparatus of the present embodiment shown in FIG. 8, a large amount of oxygen (O ₂ ) and copper (Cu) are present near the surface of the ingot. Zinc (Z
n) is present. Here, since oxygen always exists as an oxide in the alloy, the oxygen binds with copper and zinc to form an oxide film. Therefore, the presence of oxygen, copper and zinc means that an oxide film with copper and zinc is formed, and the presence of these in large amounts means that the oxide film is dense and dense. It can be said that there is.

On the other hand, according to the analysis result of the surface composition of the ingot obtained by the casting apparatus of Study Example 2 shown in FIG. 9, the oxygen and zinc contents near the surface are small (for example, at the measurement position). The oxygen concentration at 70 nm is about 35% in the ingot obtained by the casting apparatus of the present application, while Study Example 2
The ingot obtained by the casting apparatus of No. 1 has a very high copper content of only about 8%). From this, it can be seen that zinc is scarcely present on the surface portion, and only a thin oxide film composed of copper and oxygen is formed.

The layer thickness with an oxygen concentration of 10% or more is about 6 times as large as the ingot obtained by the casting apparatus of Examination Example 2 because the ingot obtained by the casting apparatus of the present application is It can be seen that the oxide film is thick and strong.

According to the ingot cast by the casting apparatus of the present embodiment, the zinc concentration is higher than that of the ingot cast in Study Example 2, so that zinc is not dropped near the surface of the ingot. You can see that it is suppressed. As a result, it becomes difficult for zinc to adhere to the mold, which causes hanging of the ingot, and it becomes possible to maintain a stable mold surface state at all times and to obtain an ingot with a stable ingot surface.

The large amount of carbon (C) immediately below the surface in both cases is considered to be due to picking up carbon in the mold.

In the above description, the case where the casting apparatus of the present invention is applied to the production of a brass ingot has been described, but it can be applied to the production of various other metal ingots such as aluminum. In addition, the present invention can further exhibit its usefulness when applied to a metal, such as brass, which is more difficult to form an oxide film than aluminum.

Here, the ingot produced by the casting apparatus of the present invention is shipped as it is or as a metal product which has been subjected to predetermined processing such as cutting or heating.

The term "metal product" as used herein means
It refers to any metal product obtained by subjecting an ingot manufactured by using the casting apparatus of the present application to a predetermined process.

As examples of such metal products, materials, intermediate products, final products and assemblies, parts for transportation equipment (for example, parts for automobiles and motorcycles, parts for small and large ships, parts for railway vehicles, aircraft) Parts, spacecraft parts, elevator parts, escalator parts, play vehicle parts, etc., industrial machine parts (for example, construction machine parts, welding machine parts, molds and parts, roller conveyor parts, bearings)・ Gears, mechanical sliding parts, heat exchanger parts, etc., musical instrument parts (eg keyboard instrument parts, string instrument parts, wind instrument parts, percussion instrument parts, etc.), electrical product parts (eg audiovisual equipment parts)・ Gas control equipment parts ・ Liquid control equipment parts ・ Home appliances parts ・ Sewing machine parts ・ Knitting machine parts ・ Playground equipment parts ・
Parts for outdoor electric appliances, parts for electric circuits, parts for electronic circuits, etc., housing products (eg building materials, exterior parts, interior parts, shrines and temples parts, etc.), parts for precision machinery (eg parts for optical equipment, measuring equipment) Parts, measuring instrument parts, clock parts, etc.), writing instruments / office supplies, water supply / drainage pipes / valves and faucets, ornaments / fashion accessories, sports equipment / weapons, cans /
There are containers, medical equipment, tools / agricultural / civil engineering tools, tableware / daily products, miscellaneous goods / gardening tools / accessories, etc.

[0070]

As is apparent from the above description, according to the present invention, the following effects can be obtained.

(1) Since only a sufficient amount of gas is supplied to the side surface of the molten metal without being taken in, it is possible to stably form a strong oxide film on the casting surface of the ingot. Become.

(2). Since such a strong oxide film is formed, the roughening of the casting surface of the ingot is alleviated, and the cutting step can be eliminated.

[Brief description of drawings]

FIG. 1 is a schematic view showing a casting apparatus which is an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing flows of a lubricant and a gas in the casting apparatus of FIG.

FIG. 3 is a diagram showing the casting apparatus of FIG.
It is a graph which shows the roughness of the casting surface in the brass ingot manufactured with the kind of casting device.

FIG. 4 is a schematic view showing a casting apparatus of Examination Example 1 which was examined by the present inventor.

FIG. 5 is a schematic diagram showing a casting apparatus of Examination Example 2 which was examined by the present inventors.

FIG. 6 is a schematic diagram showing a casting apparatus of Study Example 3, which was examined by the present inventor.

7 is an explanatory diagram showing flows of a lubricant and a gas in the casting apparatus of FIG.

FIG. 8 is a graph showing the analysis results of the surface composition of the ingot obtained by the casting apparatus of FIG.

9 is a graph showing the analysis results of the surface composition of the ingot obtained by the casting apparatus of FIG.

FIG. 10 is a schematic view showing a conventional casting apparatus.

[Explanation of symbols]

11 Molten metal receptor 12 Mold 13 Casting room 14 Molten metal 15 Lubricant discharge part 16 Carbon ring (gas discharge part) 17 Gas supply path 18 channels 19 drainage port 20 Bottom block (holding member) 21 Bottom block mounting board 22 Packing 23 ingot 111 Molten metal receptor 112 mold 114 molten metal 118 channel 119 drain 120 Bottom block (holding member) 123 float 124 Break Ring 125 carbon ring 126 Gas discharge unit 127 Lubricant discharge part 128 Lubricant supply path 129 Gas supply path

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryohei Furuta             2040 Nagasaka-Kamijo, Nagasaka-machi, Kitakoma-gun, Yamanashi Prefecture             Kitz Nagasaka factory (72) Inventor Tomoyuki Kosasa             2040 Nagasaka-Kamijo, Nagasaka-machi, Kitakoma-gun, Yamanashi Prefecture             Kitz Nagasaka factory (72) Inventor Takahashi ▲ Yasuhiro             6-10-6 Takahama, Mihama-ku, Chiba City, Chiba Prefecture F-term (reference) 4E004 JA05 KA11 KA16 NC07

Claims (13)

[Claims] 1. A casting method for producing a slab by continuously pouring a molten metal into a mold and lowering and solidifying the molten metal, wherein a lubricant is supplied to the top of the molten metal in the mold. Next, the casting method is characterized in that the molten metal is lowered while continuously supplying gas through a member having air permeability over a predetermined length in the descending direction on the entire circumference of the side surface of the molten metal in the mold. 2. The molten metal is a metal that is less likely to form an oxide film than aluminum.
The casting method described. 3. The casting method according to claim 1, wherein the molten metal is brass. 4. The casting method according to claim 1, wherein the gas is oxygen. 5. A casting chamber is formed which penetrates vertically.
A mold in which a molten metal is continuously poured into the casting chamber, and an opening facing the top of the molten metal in the casting chamber,
A lubricant discharge part for discharging a lubricant, and a gas discharge part which is arranged in an annular shape over a predetermined length in the descending direction of the molten metal on the inner circumference of the mold and which is formed of a breathable member and discharges gas. A gas supply path that opens toward the gas discharge part and through which the gas supplied to the gas discharge part flows; and a holding member that holds the solidified molten metal that continuously descends from the casting chamber of the mold A casting apparatus comprising: 6. A flow channel formed in the mold, through which cooling water for cooling the mold flows, and the cooling channel that is formed in the mold in communication with the flow channel and that is directed toward an ingot discharged from the casting chamber. The casting apparatus according to claim 5, further comprising a drainage port for discharging water. 7. The casting apparatus according to claim 5, wherein the gas discharge portion is made of carbon. 8. The casting apparatus according to claim 5, wherein the lubricant discharge portion is a radial hole that extends in the radial direction. 9. The molten metal is a metal in which an oxide film is less likely to be formed than aluminum.
The casting method according to claim 8. 10. The casting method according to claim 5, wherein the molten metal is brass. 11. The casting apparatus according to claim 5, wherein the gas is oxygen. 12. An ingot produced by using the casting apparatus according to claim 5. 13. A metal product obtained by processing the ingot according to claim 12.