KR100526096B1 - Apparatus for producing a semi-solid metallic slurry - Google Patents

Abstract

It is an object of the present invention to obtain finer and more uniform spheroidized particles and at the same time realize the advantages of improving energy efficiency, reducing manufacturing costs, improving mechanical properties, simplifying the casting process and shortening the manufacturing time, and providing high quality reactive solid metal in a short time. The present invention provides a device for producing a slurry metal slurry, which can produce a slurry, has good connection with subsequent processes, and is easy to produce and discharge a high quality slurry metal slurry. To this end, the present invention is open to both ends, a sleeve in which a liquid molten metal is injected from one end, opening and closing means for opening and closing the other end of the sleeve, disposed in the periphery of the sleeve, applying a predetermined electromagnetic field to the sleeve An agitating unit having an electromagnetic field applying coil device, and electrically connected to the stirring unit so that the electromagnetic field applying coil device generates an electromagnetic field such that an initial solidification layer is not formed on the molten metal. And an electromagnetic field application control unit adapted to be applied to the sleeve before injection and to terminate the application of the electromagnetic field to the sleeve at the time when crystal nuclei are generated in the molten molten metal. It provides a manufacturing apparatus of.

Description

Apparatus for producing a semi-solid metallic slurry

The present invention relates to an apparatus for producing a reaction solid metal slurry, and more particularly, to an apparatus for producing a solid reaction metal slurry in a solid-liquid coexistence state capable of obtaining fine and uniform spherical particles.

Metallic materials in solid-liquid coexistence state, that is, reaction solid metal slurry, refer to intermediate products of complex processing methods commonly known as reaction casting and thixocasting, which are liquid and spherical crystal grains at the temperature of the reaction solid region. In the mixed state at the proper ratio, thixotropic properties allow the metal material to be deformed by a small force, and have excellent fluidity and are easily molded and processed, such as a liquid phase. Here, the reactive solidification method refers to a processing method of producing a billet or a final molded product by casting or forging a metal slurry having a predetermined viscosity without solidification, and the semi-melt molding method is a method of regenerating a billet manufactured by a solidified method. Refers to a processing method in which the slurry is cast or forged and then made into a final product after reheating with a semi-molten metal slurry.

The reaction solid / semi-molten molding method has various advantages over the general molding method using molten metal such as casting or molten forging. For example, the slurry used in the reaction solid / semi-melt molding method has fluidity at a lower temperature than molten metal, so that the temperature of the die exposed to the slurry can be lower than that of molten metal, resulting in longer die life. Can be long. In addition, turbulence is less generated when the slurry is extruded along the cylinder, thereby reducing the incorporation of air during the casting process, thereby reducing the generation of pores in the final product. In addition, there is little solidification shrinkage, workability is improved, the mechanical properties and corrosion resistance of the product is improved, and the weight of the product is possible. Accordingly, it can be used as a new material in the automotive and aircraft industries, and electrical and electronic information communication equipment.

As described above, all of the reaction solid / semi-molding methods use a metal slurry in a reaction solid state. As described above, in the reaction solidification method, a slurry in which molten metal is cooled by a predetermined method is used. The slurry obtained by reheating the billet is used. Hereinafter, in the specification of the present invention, the reaction solid metal slurry partially dissolves at the temperature of the region where the liquid phase and the solid phase coexist between the liquid phase and the solid phase of the metal, that is, the temperature of the reaction phase of the metal. It means a metal material in a state remaining partially as a solid phase component, and refers to a slurry in a solid state prepared by the solidification molding method, that is, obtained by cooling from molten metal.

Conventional reaction solidification method is a nucleation method for producing a metal slurry in a solid-liquid coexistence state by producing a crystal nucleus in the molten metal in accordance with the manufacturing process of the slurry, and a stirring method to grow dendritic crystals and fracture it It is rough.

By the way, the conventional nucleation method is to maintain the injection temperature of the molten metal very low, and to generate a nucleus by growing the process slowly by slowing the cooling rate very slow, according to this, the production time takes too long There is a problem that is difficult to apply to the actual production process.

On the other hand, the stirring method was to make spherical particles suitable for reaction solidification by destroying the dendrite crystal structure that had already been formed by stirring at a temperature below the liquidus line mainly when cooling the molten metal. For example, mechanical stirring, electromagnetic stirring, gas bubbling, low frequency, high frequency or electromagnetic vibration, or agitation by electric shock are used.

For example, U. S. Patent No. 3,948, 650 discloses a method and apparatus for preparing a liquid-solid mixture, in which the molten metal is cooled with vigorous stirring while solidifying. In addition, the disclosed solid metal slurry production apparatus is stirred by a stir bar while injecting a solid-liquid mixture into a vessel, which stirs the solid-liquid mixture having a predetermined viscosity to flow the resinous structure in the mixture. To crush or disperse the crushed dendritic structure. In the manufacturing method as described above, to obtain spherical crystals by grinding the dendritic crystal form already formed in the cooling process as a crystal nucleus, the cooling rate decreases and the manufacturing time increases due to the latent heat generated by the formation of the initial solidification layer And uneven crystal states due to temperature unevenness in the stirring vessel. In addition, in the case of the manufacturing apparatus, due to the limitations of mechanical agitation, the temperature distribution in the container is nonuniform, and because it operates in the chamber, the working time and subsequent processes have a very difficult limit.

U.S. Patent No. 4,465,118 discloses a method and apparatus for producing a semi-solid alloy slurry, in which a cooling manifold and a mold are sequentially provided inside an electromagnetic field applying means having a coil. The upper side is formed so that molten metal is continuously injected, and cooling water flows to the cooling manifold to cool the mold. In the method for producing a high-temperature alloy slurry, first, molten metal is injected from the upper side of the mold, and the molten metal passes through the mold to first form a solidification zone by a cooling manifold, where The magnetic field is applied by the electromagnetic field applying means, the cooling proceeds while crushing the dendritic tissue, and finally an ingot is formed from the bottom. By the way, also in such a manufacturing method and apparatus, the basic technical idea is that after solidification occurs, vibration is applied to break up the dendritic structure, which also has many problems in the above-described process and structure structure. In addition, in the case of the manufacturing apparatus, it is very difficult to control the state of the metal by forming the ingot continuously as the molten metal proceeds from the top to the bottom, or by continuously growing it, and the overall process control is difficult. In addition, there is a limit in that the temperature difference in the vicinity of the wall of the container and in the vicinity of the center of the container is severe because the container is already water-cooled at the stage before the electromagnetic field is applied.

In addition, as described below, the reaction solid / semi-melt molding method is present in various ways, but all of them have the same technical idea that the dendritic tissue is already formed and used as crystal nuclei as described above. I have it.

U.S. Patent 4,694,881 discloses a dendritic tissue formed from molten metal which is heated by heating the alloy so that all metal components in the alloy are in a liquid state, then cooling the resulting liquid metal to a temperature between the liquid and solid phase lines and then applying a shear force. Disclosed is a method of making thixotropic materials by fracture.

Japanese Laid-Open Patent Publication No. 11-33692 discloses that molten metal is injected into a container at or near the liquidus temperature or up to 50 ° C above the liquidus, and at least a portion of the molten metal is below the liquidus temperature during cooling of the molten metal. At the point of passing through the liquidus temperature for the first time, for example, by applying a motion to the molten metal by, for example, ultrasonic vibration, and then gradually cooled to prepare a metal slurry for reaction solid casting having a granular crystal metal structure A method is disclosed. However, also in this method, force such as ultrasonic vibration is used to break up the dendritic crystal structure formed in the initial stage of cooling. When the pouring temperature is set higher than the liquidus temperature, it is difficult to obtain a crystalline form of granules, and at the same time, it is difficult to rapidly cool the molten metal. In addition, the structure of the surface portion and the central portion becomes uneven.

In addition, in the method for forming a semi-molten metal disclosed in Japanese Patent Laid-Open No. 10-128516, the molten metal is injected into a container, and the vibration bar is deposited in the molten metal to vibrate in contact with the molten metal to vibrate in the molten metal. To give. Accordingly, the vibration force of the vibration bar is transmitted to the molten metal, thereby forming an alloy in a solid-liquid coexisting state having crystal nuclei below the liquidus temperature, and then cooling the molten metal in the container to a molding temperature indicating a predetermined liquidity rate. By holding for 30 to 60 minutes, the crystal nuclei are grown to obtain a semi-molten metal. However, the size of the crystal nuclei obtained by this method is about 100 mu m, the process time is also long, and there is a problem that it is difficult to apply to a container having a predetermined size or more.

US Pat. No. 6,432,160 discloses a method for producing a semi-molten metal slurry by precisely controlling cooling and stirring simultaneously. Specifically, after injecting molten metal into the mixing vessel, a stator assembly installed around the mixing vessel is operated to generate sufficient magnetomotive force to rapidly stir the molten metal in the vessel. The temperature of the molten metal is rapidly lowered by using a thermal jacket installed around the mixing vessel and precisely controlling the temperature of the container and the molten metal. When the molten metal is cooled, the molten metal is continuously stirred and adjusted in such a way as to provide rapid agitation when the solid fraction is low and to provide increased electromotive force as the solid phase increases.

Conventional reaction solid / semi-melt molding methods and apparatuses according to the stirring method described above utilize shear forces to crush the dendritic crystal forms already formed during cooling to form granular metal structures. That is, at least part of the molten metal becomes effective only when the temperature of the molten metal is lowered below the liquidus line. Therefore, the cooling rate is reduced and the manufacturing time is increased due to latent heat generation due to the formation of the initial solidification layer. It is difficult to avoid various problems. In addition, it is difficult to obtain a uniform and fine structure as a whole due to the temperature non-uniformity in the container, and the non-uniformity of the tissue due to the temperature difference between the wall portion of the container and the center of the center is not achieved unless the temperature of injection of molten metal into the container is controlled. Will be further increased.

The present invention is to solve the problems of the prior art as described above, while obtaining finer and more uniform spheroidized particles, while improving energy efficiency, reducing manufacturing costs, improving mechanical properties, simplifying the casting process and shortening the manufacturing time It is an object of the present invention to provide an apparatus for producing a reaction solid metal slurry capable of realizing this.

Another object of the present invention is to provide an apparatus for producing a reaction solid metal slurry capable of producing a high quality reaction solid metal slurry in a short time and having good process connection.

It is still another object of the present invention to provide an apparatus for producing a reaction solid metal slurry which is easy to manufacture and discharge a high quality reaction solid metal slurry.

In order to achieve the above object, the present invention is a sleeve that is open at both ends, the liquid molten metal is injected from one end;

Opening and closing means for opening and closing the other end of the sleeve;

A stirring unit disposed at a periphery of the sleeve and having an electromagnetic field applying coil device for applying a predetermined electromagnetic field to the sleeve; And

Electrically connected to the stirring section, the electromagnetic field applying coil device to apply an electromagnetic field to the sleeve before the molten metal is injected into the sleeve, so that the initial solidification layer is not formed in the molten metal, It provides an apparatus for producing a reactive metal slurry comprising a; electromagnetic field application control unit provided to terminate the application of the electromagnetic field to the sleeve when the crystal nucleus is generated in the molten metal.

According to another feature of the invention, the opening and closing means may be a stopper provided to be opened and closed at the other end of the sleeve.

According to another feature of the invention, the opening and closing means may be a plunger is inserted into the other end of the sleeve to move up and down.

According to another feature of the invention, the sleeve may be provided with a nonmagnetic material.

According to another feature of the invention, the sleeve may be further provided with a temperature control device to cool the molten metal in the sleeve.

According to another feature of the invention, one end of the sleeve may be further provided with a pressing means for pressing the prepared slurry.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

First, with reference to Figure 1 looks at the method for producing a reaction metal slurry to be performed by the apparatus for producing a reaction metal slurry of the present invention.

Unlike the above-described conventional techniques, the method for producing a reactive metal slurry, which is performed by the apparatus for producing a reactive metal slurry of the present invention, performs stirring by an electromagnetic field before the injection of molten metal into the sleeve is completed according to the pouring process. . In other words, before the molten metal is injected into the sleeve, stirring is performed by an electromagnetic field to block the initial solidification layer and the formation of dendritic crystals. In this case, ultrasonic waves may be used instead of the electromagnetic field as the stirring.

First, an electromagnetic field is applied to at least one sleeve surrounded by a stirring unit for applying an electromagnetic field, and molten metal is injected. At this time, the application of the electromagnetic field is such that the initial solidification layer and the dendrite crystals do not occur in the molten metal to be injected.

As can be seen in Figure 1, molten metal is injected into the sleeve at the pouring temperature Tp. Of course, as described above, at this time, the electromagnetic field is applied to the sleeve may be in a state in which stirring is made. However, the present invention is not necessarily limited thereto, and the full-field stirring may be performed simultaneously with the injection of the molten metal.

As the electromagnetic agitation is performed before the injection of the molten metal into the sleeve is completed, the molten metal is not formed as an initial solidification layer on the inner wall of the low temperature sleeve, and thus no growth occurs into dendritic crystals. That is, fine crystal nuclei are simultaneously generated throughout the sleeve, and the molten metal in the sleeve is rapidly cooled uniformly below the liquidus temperature to generate a plurality of crystal nuclei simultaneously.

This is due to active initial stirring by pouring the molten metal into the sleeve or at the same time as the pouring, and the inner molten metal and the molten metal on the surface are well stirred so that heat transfer in the molten metal occurs quickly. This is because initial solidification layer formation is suppressed.

In addition, convective heat transfer between the well-stirred molten metal and the low temperature inner sleeve wall increases, thereby rapidly cooling the temperature of the entire molten metal. That is, the injected molten metal is dispersed into the dispersed particles by electromagnetic field stirring at the same time as the injection, and the dispersed particles are evenly distributed in the sleeve as crystal nuclei, so that a temperature difference does not occur throughout the sleeve. On the other hand, according to the prior art, the injected molten metal is in contact with the inner wall of the low temperature container to form an initial solidification layer on the inner wall of the container, and grows from the initial solidification layer into dendritic crystal.

This principle may be explained with reference to the latent heat of solidification, that is, no initial solidification of the molten metal at the wall surface of the sleeve occurs, so that the latent heat of solidification does not occur, so that the cooling of the molten metal is only performed by the molten metal. It is possible to release only the amount of heat corresponding to the specific heat (only about 1/400 of the latent heat of coagulation). Therefore, as in the prior art, the formation of dendritic crystals, which is an initial solidification layer commonly occurring on the wall surface of the sleeve, does not occur, and the molten metal in the sleeve as a whole is uniform and rapidly exhibits a temperature drop. The time it takes is only a short time of about 1 to 10 seconds after the injection of molten metal. As a result, a plurality of crystal nuclei are uniformly generated throughout the molten metal in the sleeve, and the distance between the crystal nuclei becomes very short due to an increase in the nucleation density, so that dendritic crystals do not form and grow independently to form spherical particles. do.

The same is true when an electromagnetic field is applied while molten metal is being injected. That is, as the electromagnetic field is applied before the injection of the molten metal is completed, it is difficult to form an initial solidification layer on the inner wall of the sleeve.

On the other hand, the injection temperature Tp of the molten metal is preferably maintained at a temperature (melt superheat, melt superheat = 0 ~ 100 ℃) between the liquidus temperature to the liquidus + 100 ℃. As described above, since the entire inside of the sleeve containing molten metal is uniformly cooled, there is no need to cool the liquidus temperature near the liquidus temperature before injecting the molten metal into the sleeve, and the temperature may be maintained at about 100 ° C above the liquidus temperature. Because.

On the other hand, in the conventional method of applying the electromagnetic field to the container when the molten metal is injected into the sleeve and a part of the molten metal becomes below the liquidus line, a latent solidification heat is generated while the initial solidification layer is formed on the wall of the container. Since silver is about 400 times the specific heat, it takes a lot of time for the temperature of the molten metal of the entire container to drop. Therefore, in this conventional method, it was common to cool the temperature of the molten metal to a temperature of about 50 ° C. above the liquidus level or to inject it into a container.

In addition, in the present invention, as shown in FIG. 1, the electromagnetic field agitation is at least a portion of the molten metal injected into the sleeve when the temperature drops below the liquidus temperature T ₁ , that is, the solid phase rate If any predetermined nucleus is generated after about 0.001, there is no problem in terminating at any time. That is, the electromagnetic field may be applied until the molten metal is injected into the sleeve and the molten metal is cooled, and the stirring of the electromagnetic field may be stopped before the subsequent forming process such as a die casting process or a hot forging process. This is because the magnetic field agitation at the stage of crystal grain growth around the crystal core does not affect the properties of the metal slurry to be produced because the crystal nuclei are already evenly distributed throughout the sleeve. Therefore, such electromagnetic field stirring can be continued at least until the solid phase rate of the molten metal reaches any time of 0.001 to 0.7.

However, since the duration of the electromagnetic field agitation can be considered in terms of energy efficiency, according to a preferred embodiment of the present invention, at least until the solid phase rate of the molten metal in the sleeve is 0.001 to 0.4, More preferably, it can be terminated when the solid phase rate of the molten metal is 0.001 to 0.1.

As above, after applying the electromagnetic agitation, the slurry is transferred out of the sleeve to link to subsequent processes. That is, it transfers to a die casting process, a hot forging process, or a billet manufacturing process which is a subsequent process, and is shape | molded.

On the other hand, an electromagnetic field is applied before the injection of molten metal into the sleeve is completed, and after forming a uniform distribution of crystal nuclei, the sleeve is cooled to accelerate the growth of the generated nuclei. Therefore, this cooling step may be performed when the molten metal is injected into the sleeve.

As described above, the electromagnetic field may be continuously applied even during this cooling step. Thus, this cooling step may take place while an electromagnetic field is applied to the sleeve. Accordingly, after the metal slurry in the reaction state is prepared in the sleeve, it can be used immediately in the subsequent forming process.

On the other hand, such a cooling step can be continued until the molding process, which is a subsequent process, according to a preferred embodiment of the present invention, it is also possible to maintain the cooling step until the time (t2) molten metal reaches a solid phase rate of 0.1 to 0.7. . At this time, the cooling rate of the molten metal may be about 0.2 ℃ / sec to 5.0 ℃ / sec, which may also be 0.2 ℃ / sec to 2.0 ℃ / sec depending on the distribution of crystal nuclei and fineness of the particles. .

Such cooling may be performed by a separate temperature control device as described below, but is not necessarily limited thereto, and may be naturally air-cooled.

According to this method, a metal slurry in a solid state of a solid state having a predetermined solid phase rate can be prepared, and then transferred directly to a billet manufacturing process to prepare a billet for semi-melting molding by quenching, or by die casting, forging, or press working. It can also be transferred to form a final product.

According to the present invention as described above, it is possible to significantly shorten the time for producing the metal slurry in the reaction solid state, the metal material in the form of a metal slurry with a solid phase of 0.1 to 0.7 from the time of injection of the molten metal into the sleeve The time required to form the time is only 30 seconds to 60 seconds. When the product is molded using the prepared metal slurry, a uniform and dense spherical crystal structure can be obtained.

The manufacturing method as described above can be realized by the preferred embodiment of the present invention according to Figs.

As can be seen in Figure 2, the apparatus for producing a reaction solid metal slurry according to an embodiment of the present invention, at least one sleeve (2) is open at both ends, the liquid molten metal is injected from one end, the sleeve (2) an agitating unit (1) for applying an electromagnetic field to the molten metal in the field, an electromagnetic field application adjusting unit (16) electrically connected to the agitating unit (1), and controlling the application of the electromagnetic field of the stirring unit, and the sleeve (2) At least one opening and closing to close the other end of the shell) to form a bottom of the region into which the molten metal is injected, and to open the other end of the sleeve 2 after the slurry is formed so that the slurry leaves the outside of the sleeve 2. Means (3).

The stirring portion 1 is provided on the hollow base plate 14, which is supported by a separate support member 15 so as to be installed above a predetermined height from the ground. An electromagnetic field applying coil device 11 is provided on the base plate 14, and the electromagnetic field applying coil device may be supported by a predetermined frame 12 having a space 13 therein. have.

As shown in FIG. 2, the electromagnetic field applying coil device 11 is electrically connected to the electromagnetic field applying adjusting unit 16. The electromagnetic field application adjusting unit 16 may be a control device, and includes switching means for determining the application of power and electromagnetic wave control means for adjusting the applied electromagnetic waves by adjusting voltage, frequency and electromagnetic force.

The electromagnetic field application adjusting unit 16 operates the coil device 11 for applying the electromagnetic field of the stirring unit 1 so that an initial solidification layer and / or dendritic crystals are formed on the molten metal injected into the first sleeve 2. An electromagnetic field of such degree that the molten metal M is not applied to the first sleeve 2 before the molten metal M is injected into the first sleeve 2. The electromagnetic field is terminated when the application of the electromagnetic field to the first sleeve 2 ends when the temperature of the injected molten metal reaches a liquidus line, that is, when crystal nuclei are generated in the molten metal M. The coil device 11 for application is adjusted.

The electromagnetic field application timing of the electromagnetic field applying coil device 11 is controlled by the electromagnetic field application adjusting unit 16, and the application of the electromagnetic field continues as described above, until the produced reaction metal slurry is compressed. It's okay. In other words, the electromagnetic field does not have to be terminated. However, since the electromagnetic agitation can be performed until the slurry is manufactured in the energy efficiency aspect, the electromagnetic agitation can be continued until at least the solid phase ratio is 0.001 to 0.7, preferably when the solid phase ratio is at least about 0.001 to 0.4. It may last until, and more preferably, it can be finished at least when the solid phase ratio is about 0.001 to 0.1. The time to become such a solid phase rate can be found beforehand by experiment.

Although not shown in the drawings, the stirring unit may be an ultrasonic stirring device.

The sleeve 2 is located inside the stirring unit 1, and as shown in FIG. 2, it may be installed in the space unit 13, and is closely attached to the frame 12 of the stirring unit 1. Can be fixed. This sleeve 2 can be fixedly installed on the base plate 14. In addition, the sleeve 2 may be provided as a nonmagnetic material, and may be provided as a nonmagnetic metal material or a nonmagnetic ceramic material. When the sleeve 2 is formed of a nonmagnetic material as described above, the sleeve 2 does not generate heat due to the application of the electromagnetic field. Thus, it may be more advantageous to cool the molten metal. In the case where the sleeve 2 is formed of a nonmagnetic metal material, it is preferable to use one having a melting point higher than the temperature of the molten metal accommodated. In addition, the sleeve 2 may be formed so that both ends of the upper part and the lower part are opened so that molten metal is injected into the upper end, and the lower end is closed or opened by the opening and closing means 3. That is, the sleeve 2 may have a container shape having a lower bottom as the opening and closing means 3. However, the structure of the sleeve 2 is not necessarily limited thereto, and any structure may be applied as long as the lower part is closed or opened by the opening and closing means 3. Although not shown in the drawing, the sleeve 2 may have a separate thermocouple embedded therein, and the thermocouple may be connected to the control unit to transmit temperature information to the control unit.

In addition, the sleeve 2 may be further provided with a temperature control device 20, as shown in FIG. The temperature control device 20 may be provided with a cooling device and a heating device. According to a preferred embodiment of the present invention as shown in FIG. 3, the cooling water pipe 21 is embedded outside the sleeve 2. The water jacket 22 may be installed to form a cooling device, and the heat transfer coil 23 may be installed to the outside to form a heating device. At this time, the cooling water pipe may be installed to be embedded in the sleeve, the heating device may also be used any heating mechanism other than the heat transfer coil. This temperature control device can be applied to any structure that can be adjusted to control the temperature of the molten metal or slurry in the sleeve (2). By such a thermostat, the molten metal contained in the sleeve 2 can be cooled at an appropriate rate. This sleeve 2 can of course be applied as is to all embodiments of the invention to be described below. Of course, the cooling of the molten metal contained in the sleeve 2 is not necessarily possible by the temperature control device 20, and may be naturally cooled.

On the other hand, the opening and closing means 3 provided on the lower end of the sleeve 2 is applicable to any structure as long as it can open and close the lower end of the sleeve 2, the reaction metal according to a preferred embodiment of the present invention According to the slurry manufacturing apparatus, the opening and closing means 3 may be a stopper 31 provided to be openable and openable at the bottom of the sleeve 2, as shown in FIG. 2. As shown in FIGS. 2 and 4, the stopper 31 opens and closes the lower end of the sleeve 2 by a separate driving device (not shown), and may be formed of the same material as the sleeve 2. have. The stopper 31 may be in the form of a door in which one side is hinged.

In addition, the stopper may be opened downward along the slurry to be discharged, although not shown in the drawings. That is, when the slurry is discharged, the sleeve can be opened in such a manner that the slurry is operated downward as if the slurry is supported.

The injection unit 4 is to inject a molten metal of the liquid to the sleeve 2, a conventional ladle (electrical) electrically connected to the control unit (not shown) may be used, in addition to the furnace that melts the metal Any thing may be used as long as molten metal can be injected into the sleeve 2 such that is directly connected.

According to a preferred embodiment of the present invention configured as described above, first, as shown in Figure 2, after closing the lower end of the sleeve 2 by the stopper 31, the electromagnetic field applying device in the stirring section (1) (11) applies an electromagnetic field to the sleeve 2 at a predetermined frequency and intensity. Then, the molten metal (M) melted in a separate electric furnace or the like is injected into the sleeve (2) under the influence of the electromagnetic field by the injection portion (4). At this time, the application of the electromagnetic field may be made before the injection of the molten metal (M), but is not limited to this, as described above, may be made simultaneously with the injection of the molten metal (M).

After the molten metal is injected into the sleeve 2, the molten metal M in the sleeve 2 is cooled at a predetermined speed until a solid phase rate of 0.1 to 0.7 is obtained to produce a reactive metal slurry. In this case, as described above, the cooling rate may be a rate of 0.2 ° C./sec to 5 ° C./sec, and more preferably 0.2 ° C./sec to 2 ° C./sec. Such cooling is possible by the temperature control device 20, as described above. However, the present invention is not necessarily limited thereto, and as described above, the molten metal contained in the sleeve 2 may be naturally cooled without the temperature controller 20 to produce a slurry having such a solid phase rate.

On the other hand, the application of the electromagnetic field can be continued until the cooling is finished. In other words, the application of the electromagnetic field can last until at least the solid phase is 0.001 to 0.7. However, as described above, in the energy efficiency aspect, the electromagnetic field applying device 11 may continue until at least the solid phase ratio is about 0.001 to 0.4 after injection of molten metal, and more preferably, the solid phase ratio is 0.001 to 0.4. You can exit when it is about 0.1. The time to become such a solid phase rate can be found beforehand by experiment. As described above, the cooling may continue while the electromagnetic field is applied.

After the slurry is prepared, as shown in FIG. 4, the stopper 31 is operated to open the lower end of the sleeve 2, so that the slurry S passes through the lower end of the sleeve 2 by its own weight. Allow the sleeve 2 to break out of the sleeve 2. At this time, on the outside of the lower end of the sleeve 2, a separate conveying device receives this slurry (S) and transfers it to the forming apparatus of the subsequent process to proceed with reaction molding.

Meanwhile, according to an exemplary embodiment of the present invention as shown in FIGS. 2 and 4, the formed slurry S is separated out of the sleeve 2 by its own weight, as shown in FIG. , It may be pushed down through a separate pressing means (5).

According to another preferred embodiment of the invention according to FIG. 5, a pressing means 5 connected to a separate drive (not shown) is provided on the top of the sleeve 2. The pressurizing means 5 may be applied as long as the pressurizing means 5 can press the contents of the sleeve 2 from the upper end of the sleeve 2, that is, a molten metal or a slurry. 51) can be used. The pressurizing plunger 51 is formed to be separated from the sleeve 2 when the molten metal is injected into the sleeve 2 and inserted into the upper end of the sleeve 2 after the molten metal is injected into the sleeve 2. Can be. Accordingly, the slurry can be pressurized while the slurry is being produced by electromagnetic stirring and cooling, and the slurry is pressurized after the preparation of the slurry is completed and the lower end of the sleeve 2 is opened by the stopper 31. It can be pulled out.

6 to 8 show an apparatus for producing a reaction solid metal slurry according to another preferred embodiment of the present invention. As the opening and closing means 3, the plunger 32 inserted into the lower end of the sleeve 2 is shown. The adopted structure is shown. That is, the plunger 32 driven by a separate driving device (not shown) is inserted into the lower end of the sleeve 2 to close the sleeve 2, and after the slurry is prepared, as shown in FIG. 7. Likewise, the plunger 32 is lowered to allow the slurry S to leave the sleeve 2. According to another preferred embodiment of the present invention, the slurry (S) leaving the sleeve 2 can be stably supported on the upper surface of the plunger 32, accordingly a separate robot device (not shown) It can be transferred to other processes by means of a conveying means.

On the other hand, in the above embodiment, as shown in Figure 8, the slurry (S) prepared by installing a pressing means 5, such as a separate pressing plunger 51 on the upper end of the sleeve (2) is pressurized You can do that.

According to the apparatus for producing a high solid metal slurry, it is possible to continuously manufacture a large amount of high solid metal slurry, and further increase the linkage with subsequent processes, thereby improving the efficiency of the entire process. In addition, by discharging the prepared slurry from the lower end of the sleeve, it is possible to facilitate the discharge of the slurry.

The apparatus of the present invention as described above is widely used for reaction solidification methods of various metals / alloys such as aluminum or alloys thereof, magnesium or alloys thereof, zinc or alloys thereof, copper or alloys thereof, or iron or alloys thereof. Of course, it can be applied. In addition, the metal material thus produced has a fine spherical shape with an average particle diameter of 10 to 60 µm, and its distribution is also uniform.

As described above, according to the present invention, a uniform and fine spherical structure can be obtained as compared with the conventional one, so that the mechanical properties of the alloy can be improved.

In addition, only a short time of stirring at a temperature higher than the liquidus can significantly increase the nucleation density on the wall of the container, thereby realizing spheroidization of the particles.

In addition, since the whole process can be simplified and the electromagnetic stirring time can be greatly shortened, the energy consumption required for the stirring is reduced, and the molding time of the product is also shortened, which is economically significant.

The sleeve on which the slurry is formed may be provided as a nonmagnetic material, thereby preventing heat generation due to application of an electromagnetic field, and thus may be more advantageous for cooling the molten metal.

In addition, it is also highly compatible with subsequent processes and can greatly improve yield.

And the structure of the whole apparatus is simple, and a large amount of reaction solid slurry can be manufactured more quickly and simply.

In addition, the prepared slurry can be more easily discharged.

In the present specification, the present invention has been described with reference to limited embodiments, but various embodiments are possible within the spirit of the present invention. In addition, although not described, equivalent means will also be referred to as incorporated in the present invention. Therefore, the true scope of the present invention will be defined by the claims.

1 is a graph showing a manufacturing method performed by the reaction apparatus of the present invention, slurry metal slurry of the present invention,

Figure 2 is a schematic view showing a reaction apparatus for producing a slurry slurry metal according to an embodiment of the present invention,

Figure 3 is a cross-sectional view showing another embodiment of the sleeve of the reaction apparatus for producing a metal slurry of the present invention,

4 is a configuration diagram showing a state of discharging the slurry produced by the reaction metal slurry production apparatus according to Figure 2 to the outside,

5 is a block diagram of a reaction apparatus for producing a slurry metal slurry according to another embodiment of the present invention in which the pressurizing means is added to the apparatus for preparing slurry metal slurry according to FIG.

Figure 6 is a schematic view showing a reaction apparatus for producing a slurry metal slurry according to another embodiment of the present invention,

7 is a configuration diagram showing a state of discharging the slurry produced by the reaction metal slurry production apparatus according to Figure 6 to the outside,

8 is a block diagram of a reaction apparatus for producing a slurry metal slurry according to another embodiment of the present invention in which the pressurizing means is added to the apparatus for preparing slurry metal slurry according to FIG.

<Brief description of the main parts of the drawing>

1: stirring section 11: coil device for applying electromagnetic field

16: electromagnetic field application control part 2: sleeve

3: opening and closing means 4: injection part

5: pressurizing means M: molten metal

S: slurry

Claims (6)

A sleeve which is open at both ends and in which liquid molten metal is injected from one end; Opening and closing means for opening and closing the other end of the sleeve; A stirring unit disposed at a periphery of the sleeve and having an electromagnetic field applying coil device for applying a predetermined electromagnetic field to the sleeve; And Electrically connected to the stirring section, the electromagnetic field applying coil device to apply an electromagnetic field to the sleeve before the molten metal is injected into the sleeve, so that the initial solidification layer is not formed in the molten metal, And an electromagnetic field application control unit provided to terminate the application of the electromagnetic field to the sleeve when the crystal nuclei are generated in the molten metal. The method of claim 1, The opening and closing means is a device for producing a reaction metal slurry, characterized in that the stopper provided to be opened and closed at the other end of the sleeve. The method of claim 1, The opening and closing means is a device for producing a reaction metal slurry, characterized in that the plunger is inserted into the other end of the sleeve to move up and down. The method of claim 1, The sleeve is a non-magnetic material characterized in that the reaction apparatus for producing a metal slurry. The method of claim 1, The sleeve is the apparatus for producing a reaction metal slurry, characterized in that the temperature control device is further provided to cool the molten metal in the sleeve. The method according to any one of claims 1 to 5, One end of the sleeve is a device for producing a reaction metal slurry, characterized in that the pressurizing means for pressing the prepared slurry is further provided.