JPH08174166A - Method for continuously casting alloy material and dispersing material - Google Patents

Abstract

PURPOSE: To mass-produce a uniform alloy material and dispersing material at one time by continuously supplying molten metal and a seed wire into a mold arranging an induction coil for heating and an electromagnetic coil for stirring. CONSTITUTION: The seed wire 7 is fed into the mold 1 from a seed wire inserting hole of a core 2 and also, the molten metal 8 is fed into the mold 1, from a molten metal furnace 4 and therein, the seed wire is melted in the molten metal or dispersed. At this time, the ratio of the molten metal 8 and the seed wire 7 is controlled with the outer diameter of the seed wire, feeding speed, etc. Thereafter, the molten metal melting and dispersing the seed wire is cooled and solidified in a cooling zone and drawn out from the mold 1 with drawing-out rolls 11 in such condition that the outer diameter becomes a little smaller than the inner diameter of the mold. Then, since the molten metal melting or dispersing the seed wire 8 is stirred with the electromagnetic coil 9 just before solidifying, each component is uniformly mixed without segregating, and the dispersing material is not deposited or not floated up in the molten metal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting method of an alloy material and a dispersion material suitable for continuously casting a high-concentration alloy material and an alloy material and a dispersion material which are hard to have a uniform composition.

[0002]

2. Description of the Related Art Conventionally, as a method for producing an alloy material, a batch type casting method using a crucible or the like, a horizontal continuous casting method, a continuous casting method such as a pulling type continuous casting method have been known. However, in the casting method by the batch method among these casting methods, when changing the composition of the alloy, the molten metal remaining in the molten metal furnace must be discarded and washed, and the capacity of the molten metal furnace must be changed. If the ratio is large, the yield in the case of manufacturing a large variety of products is deteriorated, so that there is a problem that productivity is low and it is difficult to always make the alloy composition uniform.

Further, in the continuous casting method, even in the case of a difficult-to-cast alloy in which the additive components of the alloy are difficult to mix in the molten state, the addition of each component of the alloy is carried out in the molten metal furnace, so that the respective components are uniformly mixed in the mold. It is difficult to supply the molten metal in the state, and if the concentration of the additive exceeds several percent, segregation will occur and cracks in the casting and cracks in the rolling process will easily occur, making it difficult to cast a high-concentration alloy. there were.

Further, when casting a metal or an alloy containing the metal which easily reacts with the material forming the crucible, the melting furnace or the runner, the crucible or the like is changed to a material having low reactivity, so that the cost is increased. There was the problem of being expensive.

On the other hand, as a method for producing the dispersion material, there are known a hot pressing method in which an alloy and fine particles of the dispersion material are mixed and then molded at high temperature and high pressure, and an internal oxidation method in which an additive component is oxidized and precipitated inside. However, all of these methods have a problem of low productivity because they are batch processes.

[0006]

As described above, as a method for producing an alloy material, a batch-type casting method using a crucible or the like, a horizontal continuous casting method, a continuous casting method such as a pulling-type continuous casting method are known. However, the batch-type casting method has a problem that the productivity is low and it is difficult to make the composition of the alloy uniform at all times and the yield is also low.In the continuous casting method, segregation occurs when the alloy composition has a high concentration. In addition to the problem that it is easy to cause, it is necessary to change the equipment etc. when casting a metal that easily reacts with a crucible or the like, or an alloy containing the metal,
There was also the problem of high costs.

On the other hand, as a method for producing a dispersion material, there are known a hot pressing method in which alloy particles and fine particles of the dispersion material are mixed and then molded at a high temperature and a high pressure, and an internal oxidation method in which an additive component is oxidized and precipitated inside. However, there is a problem that productivity is low because both are batch type.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a continuous casting method capable of efficiently producing an alloy and a dispersant having good quality.

[0009]

According to the continuous casting method for an alloy material of the present invention, one composition of the desired alloy material is placed in a mold in which an induction coil for heating and an electromagnetic coil for stirring are arranged on the outer periphery. Part of the alloy material and the seed wire consisting of the remaining components of the composition of the alloy material are continuously supplied, the seed wire is melted and stirred, and then the desired alloy material is drawn out while cooling and solidifying. In addition, the continuous casting method of the dispersion material of the present invention comprises the components of the base material of the target dispersion material in the mold in which the induction coil for heating and the electromagnetic coil for stirring are arranged on the outer periphery. After continuously supplying molten metal and a seed wire made of a dispersant or a composite material containing a dispersant by means such as compacting or filling a metal pipe, after melting and stirring the seed wire Features that pull out the target dispersion material while cooling and solidifying It is.

The seed wire used in the continuous casting method of the alloy material of the present invention is made of a pure metal or an alloy composed of two or more elements, and the molten metal as a base material is also composed of a pure metal or a composition composed of two or more elements. These are used in combination as needed.

As a combination of the molten metal and the seed wire, for example, the following combinations can be considered.

Molten metal (A) Seed wire (B) (a) Pure metal different from pure metal (A) (b) Alloy containing one or more elements in the same or different metal as pure metal (A) ( c) Pure metal different from two or more elements (A) (d) Alloy containing one or more elements in the same or different metal as two or more elements (A) Continuous casting method of dispersion material of the present invention The seed wire used for consists of a compression-molded particulate or monofilament dispersion material or a composite material containing such a dispersion material, and the molten metal that is the base material has a composition of pure metal or two or more elements. Therefore, they can be used in an appropriate combination as needed.

The following combinations are conceivable as combinations of the seed lines made of the molten metal and the dispersant.

Molten metal (A) Seed wire (B) (a) Pure metal One or more compression-molded dispersants (b) Pure metal (A) Contains one or more dispersants in the same or different metal (C) Pure metal (A) A metal pipe made of the same metal as or different from (A) containing one or more dispersants (d) Two or more kinds of elements One or more compression-molded dispersants (E) Two or more elements (A) containing one or more dispersants in the same or different metal (f) Two or more elements (A) in a metal pipe made of the same or different metal With one or more dispersants

[0015]

In the continuous casting method of the present invention, a part of the composition of the target alloy material or dispersion material is formed in the mold in which the induction coil for heating and the electromagnetic coil for stirring are arranged on the outer periphery. A molten metal and a seed wire made of the remaining components of the composition of the alloy material or a seed wire made of a dispersant are continuously supplied, and the seed wire and the molten metal are mixed and stirred by an electromagnetic coil, so that segregation occurs even in high-concentration alloy compositions. In this case, even if a difficult-to-cast alloy in which each composition is difficult to mix in a molten state is mixed, the dispersion material does not precipitate or float in the molten metal even when the dispersion material is cast.

Further, the composition of the alloy can be easily changed by changing the kind of seed line and the supply rate.

Further, since the inside of the molten metal furnace is not contaminated by the alloy composition, there is no need to waste hot water or cleaning even when changing the alloy composition, and it is possible to perform casting of various kinds with good yield.

[0018]

EXAMPLES Next, examples of the present invention will be described.

FIG. 1 is a vertical sectional view showing an embodiment of the continuous casting apparatus of the present invention.

In FIG. 1, reference numeral 1 is a mold having a cylindrical shape as a whole, which is arranged so that its axis is vertical and has a seed line insertion hole at its center in the center thereof.
Are arranged concentrically. The mold 1 is connected to the melt furnace 4 via a runner 3, and an induction coil 5 for heating is embedded in the mold 1 and the runner 3. A temperature control mechanism 6 is installed in the core 2 to preheat the seed wire 7 passing through the core 2 to a predetermined temperature.

Further, a cooling zone for cooling and solidifying the molten metal 8 is provided in the upper part of the mold 1, and an electromagnetic coil 9 for stirring the molten metal is arranged from the outer periphery of the cooling zone to the lower part thereof. Further, a take-up roll 11 for taking up the manufactured alloy material or the dispersion material 10 upward is arranged above the cooling zone, and a feed roll 12 for feeding the seed line upward is arranged below the mold 1.

In this embodiment, the seed wire is sent from the seed wire insertion hole of the core 2 into the mold 1, and the molten metal is also sent from the melt furnace 4 into the mold 1, where the seed wire is inside the molten metal. Dissolve or disperse in. At this time, the ratio of molten metal to seed wire is the outer diameter of the seed wire,
It is controlled by the feed rate.

Thereafter, the molten metal in which the seed wire is melted or dispersed is cooled and solidified in the cooling zone, and is taken out from the mold 1 by the take-up roll 11 with the outer diameter being slightly smaller than the inner diameter of the mold.

Since the molten metal in which the seed wire is dissolved or dispersed is stirred by the electromagnetic coil 9 just before solidification, the components are uniformly mixed without segregation, and the dispersant is also precipitated in the molten metal. It does not float or float.

A specific example of continuously casting the following refractory casting alloy, high-concentration alloy and dispersant using the continuous casting apparatus of the embodiment will be described.

Experimental Example 1 Difficult-to-cast alloy (Cu-Pb alloy) A diameter obtained by coating a molten molten pure copper with a pure copper pipe.
A 2 mm lead seed wire was inserted, and the mixture was heated and melted. Then, a Cu-Pb alloy having a diameter of 14 mm was continuously drawn out while mixing, stirring, cooling and solidifying, and casting was performed.

When the casting speed is 1.3 m / min and the lead seed wire supply speed is 0.08 m / min, Cu of Pb 0.21%
Pb alloy rod, Cu-P of Pb 0.35% when casting speed is 1.3 m / min and lead seed wire supply rate is 0.13 m / min
b alloy rod, Pb 0.40% Cu-Pb at a casting speed of 1.3 m / min and a lead seed wire feed rate of 0.15 m / min
It was possible to cast alloy rods of. In addition, in this experimental example, the preheating of the supply seed wire was not performed.

Experimental Example 2 Difficult-to-cast alloy (Cu-Zr alloy) A zirconium seed wire having a diameter of 2 mm was inserted into a molten pure copper melt which had been heated and melted, and the mixture was heated and melted, followed by mixing and stirring to form Cu-Zr alloy.
The alloy was continuously drawn and cast.

When the casting speed is 1.3 m / min and the supply rate of zirconium is 0.06 m / min, Cu-Zr of Zr 0.18% is obtained.
Alloy, casting speed 1.3 m / min, zirconium feed rate 0.
When it is set to 13 m / min, Zr 0.39% Cu-Zr alloy,
Zirconium feed rate of 0.20 m / m at a casting speed of 1.3 m / min
When in was used, a Zr0.60% Cu—Zr alloy rod could be easily cast. In this experimental example, the seed wire was preheated at 1000 ° C.

Here, Zr is a metal that easily reacts with carbon, but in this experimental example, it is supplied by the seed line,
It was possible to perform casting without causing a problem due to the reaction because the Zr did not come into contact with the melting furnace or runner made of carbon.
Moreover, since the metal and the mold do not come into direct contact with each other due to the inward force due to the electromagnetic force between the carbon mold and the carbon mold, there is no problem due to the reaction.

Experimental Example 3 High-concentration alloy (Cu-Ag alloy) A high-concentration Cu-Ag alloy was prepared by inserting a seed wire of silver with a diameter of 2 mm into a molten molten pure copper, heating and melting, and then mixing and stirring. Was continuously drawn to perform casting.

At a casting speed of 1.3 m / min, a silver supply rate of 13 m / mi
If n is set, Cu 32% Ag-Cu-Ag alloy, casting speed
Ag is 1.3m / min when the supply rate of silver is 10m / min.
When a 25% Cu-Ag alloy and a casting speed of 1.3 m / min and a silver supply rate of 5 m / min, a Cu-Ag alloy rod of Ag 12.3% could be easily cast. In this experimental example, the seed wire was preheated at 800 ° C.

Experimental Example 4 Dispersing Material (Cu-Al ₂ O ₃ Dispersing Material) To a molten pure copper melt which has been heated and melted, alumina powder (Al ₂ O ₃ particle diameter of 0.05 micron) as a dispersing material is a copper powder having a similar particle diameter. And alumina powder are mixed at a mixing ratio of 1.5% and 2m
m (diameter) x 10 mm (length) pellet-shaped seed wire was covered with a pure copper tube and inserted, and after heating and melting, mixing and stirring were performed to continuously draw out the alloy of copper and alumina for casting. It was

When the Cu--Al ₂ O ₃ feed rate was 0.13 m / min at a casting rate of 1.3 m / min, 0.15% alumina-dispersed copper rods could be cast. In this experimental example, the feed pellets were preheated at 800 ° C.

In each of the alloy material and the dispersion material obtained in the above experimental example, the respective components were uniformly mixed without segregation, and the dispersion material did not precipitate or float in the molten metal. .

[0036]

As described above, according to the continuous casting method of the present invention, the seed line or dispersion consisting of the molten metal which is a part of the composition of the target alloy material and the remaining component of the composition of the alloy material. Material and a seed wire made of a composite material containing a dispersion material are directly supplied into the mold, and the seed wire and the molten metal are heated and melted and mixed and stirred by the electromagnetic coil in the mold, and stirring is continued until just before cooling and solidification and is pulled up. Can suppress segregation.

Further, since the alloy materials are uniformly mixed with each other by mixing and stirring, even alloys which are unlikely to have a uniform composition can be continuously and homogeneously cast with good productivity. Furthermore, even in the case of the dispersant, the fine particles of the dispersant can be uniformly dispersed in the molten metal, which is far lower than the high cost and low efficiency methods such as the conventional hot pressing method and internal oxidation method. It is possible to mass-produce a uniform dispersion material at a cost.

[Brief description of drawings]

FIG. 1 is an apparatus for a continuous casting method for casting alloys and dispersion materials.

[Explanation of symbols]

 1 ……… Mold 2 ……… Core 3 ……… Runner 4 ……… Melting furnace 5 ……… Induction coil 6 ……… Temperature control mechanism 7 ……… Seed wire 8 ……… Molten metal 9 …… ... Electromagnetic coil 10 ... Alloy or dispersion material 11 ... Take-up roll 12 ... Feed roll

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tomomi Kuriyama Inventor Tomoki Kuriyama 2-1-1 Oda Sakae, Kawasaki-ku, Kanagawa Prefecture Showa Electric Cable Denki Co., Ltd. (72) Toru Hirota 2 Sakae Oda, Kawasaki-ku, Kawasaki-shi, Kanagawa 1-1-1 Showa Electric Cable Co., Ltd. (72) Inventor Toyoharu Kagaya 2-1-1 1-1 Oda Sakae, Kawasaki-ku, Kawasaki-shi, Kanagawa Kanagawa Prefecture (72) Akira Imai Kawasaki, Kawasaki-shi, Kanagawa 2-1-1, Oda-ku, Showa Electric Wire Co., Ltd. (72) Inventor, Mitsuhisa Harada 2-1-1, Odae, Kawasaki-ku, Kanagawa

Claims (2)

[Claims] 1. A molten metal consisting of a part of the composition of the target alloy material and the remainder of the composition of the alloy material are placed in a mold having an induction coil for heating and an electromagnetic coil for stirring on the outer periphery. A continuous casting method of an alloy material, characterized in that a seed wire composed of components is continuously supplied, the seed wire is melted and stirred, and then a desired alloy material is drawn out while being cooled and solidified. 2. A molten material composed of a base material of a target dispersant and a composite material containing the dispersant or the dispersant in a mold in which an induction coil for heating and an electromagnetic coil for stirring are arranged on the outer periphery. The continuous casting method of a dispersion material, comprising: continuously supplying a seed wire composed of, melting and stirring the seed wire, and then cooling and solidifying the desired dispersion material.