JP5704642B2 - Melting furnace for metal production - Google Patents

Description

  The present invention relates to a melting furnace for producing metals such as titanium, and more particularly to a melting furnace structure for producing metals that can improve the production efficiency of metal ingots.

  Titanium metal production has been greatly increased not only in the aircraft industry but also in recent years with the expansion of global demand. Along with this, the demand for not only sponge titanium but also metal titanium ingots is greatly increasing.

  A metal titanium ingot is formed by forming titanium sponge made by a so-called crawl method, which reduces titanium tetrachloride with a reducing metal, into briquettes, and then combining the briquettes into an electrode for melting, and then vacuum arc melting the electrodes. Manufactured by.

  Another method for producing a metal titanium ingot is to mix metal titanium scrap with sponge titanium to produce a melting raw material, which is melted in an electron beam melting furnace or a plasma melting furnace, and cooled and solidified in a mold. A method of pulling out the mold from the mold is also known. An example of this electron beam melting furnace is shown in FIGS. 1 to 3 (FIG. 2 is a plan view seen from a direction A in FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB).

  Unlike the vacuum arc melting furnace, the electron beam melting furnace does not necessarily require the melting raw material to be formed into an electrode, and has a feature that the granular or lump raw material 12 can be directly put into the hearth 20 for melting. doing.

  Moreover, in the electron beam melting furnace, the molten metal 20 produced by melting the raw material 12 with the hearth 20 can be supplied to the mold 16 while volatilizing impurities in the raw material. There is an effect that it can be melted.

  Thus, according to the electron beam melting furnace with a hearth, not only metallic titanium but also high purity even when melting a raw material containing impurities in a high melting point metal such as zirconium, hafnium or tantalum. Metal ingots can be manufactured.

  However, in the electron beam melting furnace, as described above, the ingot 22 cooled and solidified by the mold 16 is extracted by the extraction jig 30. The ingot 22 immediately after being pulled out from the mold 16 is at a high temperature, and the inside of the drawing portion 50 is depressurized, so it is difficult to cool the ingot with water spray as in continuous casting of steel, Actually, as indicated by the wavy arrows in FIGS. 1 and 3, the ingot 22 is cooled mainly by heat radiation only by radiation, and it takes a long time to cool to near room temperature. Thus, since cooling of the ingot in the extraction part 50 requires time, the efficient cooling structure of the ingot produced | generated with the casting_mold | template 16 is desired.

  In order to improve the manufacturing efficiency of the ingot, as shown in FIGS. 4 to 7 (FIG. 5 is a plan view seen from the direction A in FIG. 4, and FIG. 6 is a side view seen from the direction C in FIG. Yes, FIG. 7 is a cross-sectional view taken along the line B-B), and an electron beam melting furnace is proposed in which a plurality of molds 16 are arranged, molten metal is distributed by the scissors 17, and a plurality of ingots can be manufactured simultaneously ( For example, see Patent Document 1).

  Also in such an electron beam melting furnace, as described above, the plurality of ingots 22 must be dissipated by radiation, and the cooling efficiency of the ingot is poor. Further, as shown in FIGS. Although the radiant heat is well radiated from the surface of the ingot facing to the extraction portion outer cylinder 51, the heat radiation does not proceed on the surface where the ingots face each other (near the center in the extraction portion 50). There is a problem that the cooling rate does not increase. Furthermore, an inhomogeneous temperature distribution occurs in one ingot, and there are cases where deformation such as warpage of the ingot is accompanied, and improvement has been demanded.

  The above-described problem is common to plasma arc melting furnaces, and a melting furnace for metal melting that can solve the above-described problems is desired.

Japanese Examined Patent Publication No. 3-75616

  This invention is made | formed in view of the said condition, and it aims at providing the melting furnace for metal melting which can improve manufacturing efficiency by rapidly cooling the ingot thus melted.

  As a result of intensive studies in view of such circumstances, it has been found that the cooling of the ingot can be promoted by disposing a cooling member of a specific form in the ingot extraction portion, and the present invention has been completed. It was.

That is, the melting furnace for melting metal according to the present invention includes a raw material feeder, a heating source for melting the raw material, a hearth for holding the molten metal generated by melting the raw material, and a plurality of molds charged with the molten metal. An ingot withdrawing portion provided with a plurality of drawing jigs for drawing out an ingot which is provided below the melting portion and which cools and solidifies the molten metal in the plurality of molds, and an outer cylinder installed outside the ingot A melting furnace for melting metal, characterized in that a cooling member is disposed between at least the plurality of ingots in the outer cylinder. Moreover, it is set as the preferable aspect that a cooling member is arrange | positioned also between the extraction part outer cylinders and an ingot.

  In this invention, it is set as the preferable aspect that the cooling member is arrange | positioned so that a predetermined distance may be maintained along the surface of the production | generation ingot pulled out.

  In the present invention, it is preferable that the cooling member surrounds the entire circumference of the ingot or a part of the circumference in a cross section perpendicular to the drawing direction of the ingot.

  In this invention, it is set as the preferable aspect that the cross section of an ingot is a rectangle, a circle, an ellipse, a barrel shape, a polygon, or an indefinite shape.

  In this invention, it is set as the preferable aspect that the cooling member is comprised with the water-cooled copper jacket or the water-cooled copper coil.

  In the present invention, a plurality of molds are disposed in the melting portion so that a plurality of ingots can be melted simultaneously, and a cooling member is disposed between the plurality of ingots in the drawing portion. Is a preferred embodiment.

  In this invention, it is set as the preferable aspect that the some casting_mold | template is arrange | positioned in the drawing | extracting part so that the surface of the longitudinal direction of the said ingot can be extracted at the same distance mutually.

  In this invention, it is set as the preferable aspect that the some casting_mold | template is arrange | positioned in the said extraction part so that the surface of the longitudinal direction of the said ingot can be extracted radially.

  In the present invention, it is preferable that the heating source is an electron beam or a plasma arc.

  By using the melting furnace for metal melting according to the present invention, the extracted ingot can be quickly cooled, thereby producing the effect that the production efficiency of the ingot can be improved.

  In the case where a plurality of ingots are extracted at the same time, not only can the cooling rate of the generated ingot be increased by promoting heat dissipation between the opposing ingots, but also the formation of a non-uniform temperature distribution within one ingot. This is advantageous in that it is suppressed and thermal deformation of the ingot accompanying this can be avoided.

FIG. 1 is a schematic cross-sectional view showing common components in an electron beam melting furnace for manufacturing a single ingot according to the related art and the present invention. FIG. 2 is a plan view seen from the direction A in FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a schematic cross-sectional view showing common components in an electron beam melting furnace for manufacturing a plurality of ingots according to the related art and the present invention. FIG. 5 is a plan view seen from the direction A in FIG. FIG. 6 is a side view seen from the direction C in FIG. 7 is a cross-sectional view taken along line BB in FIG. 8A and 8B are schematic views showing an embodiment of the present invention, in which FIG. 8A is a side sectional view of an ingot drawing portion, and FIG. 8B is a sectional view taken along line BB in FIG. 9A and 9B are schematic views showing an embodiment of the present invention, in which FIG. 9A is a side cross-sectional view of an ingot drawing portion, and FIG. 9B is a cross-sectional view along line BB in FIG. 10A and 10B are schematic views showing an embodiment of the present invention, in which FIG. 10A is a side sectional view of an ingot drawing portion, and FIG. 10B is a sectional view taken along line BB in FIG. 11A and 11B are schematic views showing an embodiment of the present invention, in which FIG. 11A is a side sectional view of an ingot drawing portion, and FIG. 11B is a sectional view taken along line BB in FIG. 12A and 12B are schematic views showing an embodiment of the present invention, in which FIG. 12A is a side sectional view of an ingot drawing portion, and FIG. 12B is a sectional view taken along line BB in FIG. FIGS. 13A and 13B are schematic views showing an embodiment of the present invention, in which FIG. 13A is a side sectional view of an ingot drawing portion, and FIG. 13B is a sectional view taken along line BB in FIG. 14A and 14B are schematic views showing an embodiment of the present invention, in which FIG. 14A is a side sectional view of an ingot drawing portion, and FIG. 14B is a sectional view taken along line BB in FIG. 15A and 15B are schematic views showing an embodiment of the present invention, in which FIG. 15A is a side cross-sectional view of an ingot drawing portion, and FIG. 15B is a cross-sectional view along line BB in FIG. FIG. 16 is a partial plan view showing a melting portion in one embodiment of the present invention. FIG. 17 is a cross-sectional view showing the ingot extraction portion of the embodiment of FIG. FIG. 18 is a partial plan view showing a melting portion in one embodiment of the present invention. FIG. 19 is a cross-sectional view showing the ingot extraction portion of the embodiment of FIG. 20 (a) to 20 (c) are cross-sectional views showing an ingot pullout portion in an example of another modified example of the present invention. FIG. 21 is a cross-sectional view showing an ingot drawing portion in an example of another modification of the present invention. 22A and 22B are schematic views showing an embodiment of the present invention, in which FIG. 22A is a side sectional view of an ingot drawing portion, and FIGS. 22B and C are plan sectional views in FIG.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment of the present invention will be described below in detail with reference to the drawings, taking as an example the case where the melting furnace for metal melting is an electron beam melting furnace. In the following description, the raw material is sponge titanium, the ingot to be produced is metallic titanium, and the ingot to be produced has a rectangular cross section as an example, but the electron beam melting furnace of the present invention is a titanium ingot produced. It is not limited to the above, but can be similarly applied to any refractory metal such as zirconium, hafnium, tungsten or tantalum, other metals capable of producing an ingot by an electron beam melting furnace, and alloys thereof. In addition, it is not limited to a rectangle, and includes any cross-sectional shape such as a circle, an ellipse, a barrel, a polygon, and other irregular shapes.

First embodiment (single ingot + flat plate cooling member)
1 to 3 show components common to a conventional electron beam melting furnace and an electron beam melting furnace according to the present invention for producing a single ingot. 2 is a plan view seen from the direction A in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. The electron beam melting furnace shown in FIG. 1 is composed of a melting part 40 for melting a raw material and a drawing part 50 for drawing an ingot produced therebelow.

  In the melting part 40 defined by the melting part wall 41, a raw material supplier 10 such as an Archimedes can for supplying titanium raw material 12 composed of sponge titanium or titanium scrap, and a vibration feeder for transferring the raw material 12 The raw material transfer machine 11 such as, the hearth 13 for melting the supplied raw material, the electron beam irradiator 14 for melting the raw material 12 supplied to the hearth 13 to form the molten metal 20, and cooling and solidifying the molten metal 20 to ingot There are provided a mold 16 made of water-cooled copper or the like for forming a metal, and an electron beam irradiator 15 for irradiating and melting the mold 16 with an electron beam to form a molten pool 21.

A drawing portion 50 defined by a drawing portion outer cylinder 51 is provided below the casting mold 16 of the melting portion 40. In the drawing portion 50, drawing is performed to pull down the ingot 22 formed of the casting mold 16. A jig 30 is provided.
In addition, the inside of the melting | dissolving part 40 and the extraction part 50 is comprised so that a pressure-reduced atmosphere may be maintained.

  First, the raw material 12 supplied from the raw material supply machine 10 is melted by the electron beam irradiation machine 14 in the hearth 13 to form the molten metal 20. The molten metal 20 is supplied into the mold 16 from downstream of the hearth 13. Prior to melting the raw material 12, a stub (not shown) is arranged in the mold 16, and this stub forms the bottom of the mold 16. The stub is made of the same metal as the raw material 12 and is integrated with the molten metal 20 supplied into the mold 16 to form an ingot 22.

  The surface of the molten metal 20 continuously supplied onto the stub in the mold 16 is heated by the electron beam irradiator 15 to form a molten pool 21, and the bottom of the molten metal 20 is cooled and solidified by the mold 16. The ingot 22 is formed integrally with the stub.

  The ingot 22 generated in the mold 16 is extracted into the extraction portion 50 while adjusting the extraction speed of the extraction jig 30 engaged with the stub so that the level of the molten pool 21 becomes constant.

  The above is the configuration and operation common to the conventional electron beam melting furnace for manufacturing a single ingot and the electron beam melting furnace according to the present invention. In the first embodiment of the present invention, as shown in FIG. A flat plate-like cooling member 60 is disposed in the portion 50.

  In FIG. 8, (a) is a sectional side view of the extraction portion 50, and (b) is a sectional view taken along the line BB in (a). As shown in FIG. 8, a flat plate-like cooling member 60 is arranged on one side surface of the drawn ingot 22 and the drawing jig 30 so as to extend a predetermined distance along the surface of the ingot 22. It is installed. The cooling member 60 is not particularly limited as long as it can be cooled from the outside by circulation of a refrigerant or the like, and can be constituted by, for example, a water-cooled copper jacket.

  As shown in FIG. 3, in the conventional electron beam melting furnace, since the extraction part 50 is maintained at a reduced pressure, heat is radiated to the extraction part outer cylinder 51 of the electron beam melting furnace mainly by radiation. According to the first embodiment of the present invention, since the flat plate-like cooling member 60 is disposed in the extraction portion 50 between the ingot and the main body of the electron beam melting furnace, the radiation distance is shortened and the radiation is performed. The amount of heat released due to the increase increases the cooling of the ingot 22. As a result, there is an effect that the drawing speed of the generated ingot can be increased. Improvement of the cooling rate of the ingot means that the dissolution rate can be increased, and as a result, the production rate of the ingot can be increased.

Second embodiment (single ingot + U-shaped cooling member)
In the second embodiment of the present invention, as shown in FIG. 9, a U-shaped cooling member is disposed in the extraction portion 50. In FIG. 9, (a) is a side sectional view of the extraction portion 50, and (b) is a sectional view taken along line BB in (a).

  As shown in FIG. 9, a cooling member 61 having a U-shaped cross section in the drawing direction is provided along the three sides of the ingot 22 on the three side surfaces of the drawn ingot 22 and the drawing jig 30. It is arranged so as to extend while maintaining a distance.

  According to the second embodiment of the present invention, since the U-shaped cooling member 61 is disposed in the extraction portion 50, the heat dissipation of the ingot 22 is further promoted and the cooling is performed as compared with the first embodiment. The effect is that it can be performed quickly.

Third embodiment (single ingot + square cooling member)
In the third embodiment of the present invention, as shown in FIG. 10, a square-shaped cooling member is disposed in the extraction portion 50. 10A is a side sectional view of the extraction portion 50, and FIG. 10B is a sectional view taken along line BB in FIG.

  As shown in FIG. 10, the cooling member 62 whose section in the drawing direction has a square shape so as to surround the four sides of the drawn ingot 22 and the drawing jig 30 is a predetermined distance along the four surfaces of the ingot 22. Is arranged so as to extend.

  According to the third embodiment of the present invention, since the square-shaped cooling member 62 is disposed in the extraction portion 50, the ingot can be cooled from all directions, and the first and second embodiments In comparison, the heat dissipation of the ingot 22 is further promoted, and the effect that cooling can be performed quickly is achieved.

Fourth embodiment (single ingot + coiled cooling member)
As shown in FIG. 11, the fourth embodiment of the present invention is characterized in that a cooling member made of a spiral coil is disposed in the extraction portion 50. In FIG. 11, (a) is a sectional side view of the extraction portion 50, and (b) is a sectional view taken along line BB in (a).

  As shown in FIG. 11, the coil-shaped cooling member 63 spirally surrounds the four sides of the extracted ingot 22 and the extraction jig 30, and extends at a predetermined distance along the four surfaces of the ingot 22. It exists so that it may exist. The cooling member 63 is not particularly limited as long as it is a tubular member through which a refrigerant can be circulated from the outside. For example, the cooling member 63 can be formed of a water-cooled copper coil.

  According to the fourth embodiment of the present invention, since the coil-shaped cooling member 63 is disposed in the extraction portion 50, the ingot can be cooled from all directions, and the ingot 22 can be cooled as in the third embodiment. The effect of further promoting the heat radiation and cooling can be achieved.

Fifth embodiment (multiple ingots + flat plate cooling member)
4 to 7 show components common to a conventional electron beam melting furnace and an electron beam melting furnace according to the present invention for manufacturing a plurality of ingots. 5 is a plan view seen from the direction A in FIG. 4, FIG. 6 is a side view seen from the direction C in FIG. 4, and FIG. 7 is a sectional view taken along line BB in FIG. is there. Among the components of the electron beam melting furnace shown in FIG. 4, the raw material supply machine 10, the raw material transfer machine 11, the hearth 13, and the electron beam irradiation machines 14 and 15 are common to the electron beam melting furnace shown in FIG. Since there is, description is abbreviate | omitted.

  In the electron beam melting furnace shown in FIGS. 4 to 7, two casting molds 16 are provided in parallel so that the longitudinal sides are parallel to each other, and further, between the hearth 13 and the casting mold 16, A trough 17 is provided for receiving 20 and distributing it to each of the plurality of molds 16. In the extraction part 50 installed below the melting part 40, a plurality of extraction jigs 30 are provided corresponding to the plurality of molds 16, and configured to pull out the ingot 22 formed by the plurality of molds 16. Yes.

  The above is the configuration and operation common to the conventional electron beam melting furnace for manufacturing two ingots and the electron beam melting furnace according to the present invention. In the fifth embodiment of the present invention, as shown in FIG. A flat plate-like cooling member 60 is disposed in the drawing portion 50.

  In FIG. 12, (a) is a sectional side view of the extraction portion 50, and (b) is a sectional view taken along line BB in (a). As shown in FIG. 12, a flat cooling member 60 maintains a predetermined distance along the surface of each ingot 22 in the space between the two drawn ingots 22 and the extraction jig 30. It is arrange | positioned so that it may extend.

  As shown in FIG. 7, in the conventional electron beam melting furnace, the drawing portion 50 is maintained at a reduced pressure, so that the ingot 22 cannot be cooled by directly supplying the refrigerant, and is indicated by a wavy arrow. In addition, the ingot 22 was mainly cooled by radiation. Of the surface of the two rows of ingots 22, heat is released by radiation from the surface facing the extraction portion outer cylinder 51, and cooling proceeds, but in the vicinity of the center where the two rows of ingots face each other, radiant heat is generated. As a result, the cooling rate of the ingot 22 decreases, which causes a decrease in the production rate of the ingot. In addition, since the two rows of ingots do not relatively cool as compared with the peripheral portions of the ingots 22 that face each other, non-uniform temperature distribution occurs in the same ingot depending on the surface, and the ingot is deformed such as warping. It was a cause.

  However, according to the fifth embodiment of the present invention, the flat plate-like cooling member 60 is disposed between the two rows of ingots 22. Therefore, heat radiation is promoted even on the surfaces where the ingots face each other, and the cooling is quickly performed. Can be done. As a result, there is an effect that cooling can be performed uniformly from the entire surface of the ingot.

  In the fifth embodiment, the example in which the ingots are manufactured in two rows has been described. However, the present embodiment is not limited to the two rows of ingots, and the ingot may be a plurality of rows of three or more rows. In that case, the ingot 22 and the cooling member 60 may be alternately arranged.

Sixth embodiment (multiple ingots + U-shaped cooling member)
In the sixth embodiment of the present invention, as shown in FIG. 13, a U-shaped cooling member is disposed in the extraction portion 50. In FIG. 13, (a) is a sectional side view of the extraction portion 50, and (b) is a sectional view taken along line BB in (a).

  As shown in FIG. 13, the two rows of ingots 22 and the drawing jig 30 that are drawn out are respectively provided on three sides, and a cooling member 61 having a U-shaped cross section in the drawing direction is provided along the three sides of the ingot 22. So as to extend at a predetermined distance.

  According to the sixth embodiment of the present invention, since the U-shaped cooling member 61 is disposed in the extraction portion 50, the heat dissipation of the ingot 22 is further promoted and the cooling is performed as compared with the fifth embodiment. It can be done promptly.

In the sixth embodiment, an example in which two rows of ingots are manufactured has been described. However, the present embodiment is not limited to two rows of ingots, and a plurality of rows in which three or more rows of combinations of ingots and cooling members are arranged. It is also possible.
It is also possible to dispose the two sets of U-shaped cooling members shown in FIG.

Seventh embodiment (multiple ingots + square cooling member)
In the seventh embodiment of the present invention, as shown in FIG. 14, a square-shaped cooling member is disposed in the extraction portion 50. 14A is a side sectional view of the extraction portion 50, and FIG. 14B is a sectional view taken along line BB in FIG. 14A.

  As shown in FIG. 14, the two rows of ingots 22 and the drawing jig 30 are each surrounded by a cooling member 62 having a square cross section in the drawing direction on the four sides of the ingot 22 so as to surround the four sides. It is arrange | positioned so that a predetermined distance may be maintained along.

  According to the seventh embodiment of the present invention, since the square-shaped cooling member 62 is disposed in the extraction portion 50, the ingot can be cooled from all directions, and the fifth and sixth embodiments and In comparison, heat dissipation of the ingot 22 can be further promoted, and cooling can be performed quickly.

  In the seventh embodiment, an example in which two rows of ingots are manufactured has been described. However, the present embodiment is not limited to two rows of ingots, and a plurality of combinations in which three or more rows of combinations of ingots and cooling members are arranged. It can also be a column.

Eighth embodiment (multiple ingots + coiled cooling member)
As shown in FIG. 15, the eighth embodiment of the present invention is characterized in that a cooling member made of a spiral coil is disposed in the extraction portion 50. In FIG. 15, (a) is a sectional side view of the extraction portion 50, and (b) is a sectional view taken along line BB in (a).

  As shown in FIG. 15, the coil-shaped cooling member 63 spirally surrounds the four sides of the two rows of ingots 22 and the extraction jig 30 and has a predetermined distance along the four surfaces of the ingot 22. It is arranged so as to extend.

  According to the eighth embodiment of the present invention, since the coil-shaped cooling member 63 is disposed in the extraction portion 50, the ingot can be cooled from all directions, and the ingot 22 is the same as in the seventh embodiment. The heat dissipation can be further promoted, and the cooling can be performed quickly.

  In the eighth embodiment, an example in which two rows of ingots are manufactured has been described. However, the present embodiment is not limited to two rows of ingots, and a plurality of combinations of ingots and cooling members arranged in three or more rows. It can also be a column.

Ninth embodiment (multiple ingots + triangular prism cooling member)
Subsequently, another embodiment of the present invention will be described. FIG. 16 is an example in which the arrangement of the plurality of molds 16 is changed in the melting part 40 in the electron beam melting furnace of the present invention. As shown in FIG. 16, the two molds 16 are arranged so that their longitudinal surfaces are non-parallel, and the molten metal 20 is distributed to each mold 16 between the hearth 13 and the mold 16. A trough 18 is provided.

  FIG. 17 shows a cross-sectional view of the ingot manufactured by the melting part 40 shown in FIG. As shown in FIG. 17, the drawn out two rows of ingots 22 are arranged in a letter C shape, and in the space sandwiched between the two rows of ingots, a triangular prism-shaped cooling member 64 has two faces of the triangular prism. Are arranged so as to extend in parallel with the surface of each ingot 22 at regular intervals.

  According to the ninth embodiment of the present invention, even if the surfaces of the two rows of ingots are not parallel to each other, the cooling member disposed between the ingots is a triangular prism, and the two surfaces are the respective ingots. Since it is provided so as to be parallel to the surface, heat radiation can be promoted between the ingots, and cooling can be performed quickly. As a result, it becomes possible to perform cooling uniformly from the entire surface of the ingot.

Tenth embodiment (multiple ingots + triangular prism-shaped cooling member)
FIG. 18 shows an example in which the arrangement of the mold 16 is changed in the melting part 40 in the electron beam melting furnace of the present invention. As shown in FIG. 18, the plurality of molds 16 are arranged so that their longitudinal surfaces are radial, and between the hearth 13 and the mold 16, the molten metal 20 is distributed radially to each mold 16. A scissor 19 is provided.

  FIG. 19 shows a cross-sectional view when the ingot manufactured by the melting part 40 shown in FIG. As shown in FIG. 19, the plurality of ingots 22 that have been drawn out are arranged in a radial pattern, and a triangular prism-shaped cooling member 65 is provided in each of two faces of the triangular prism in a space between two adjacent rows of ingots. Are arranged so as to extend in parallel with the surface of each ingot 22 at regular intervals.

According to the tenth embodiment of the present invention, even if a plurality of ingots are arranged radially and their surfaces are not parallel to each other, the cooling member disposed between the ingots is a triangular prism, and the two surfaces are Since it is provided so as to be parallel to the surface of each ingot, heat radiation can be promoted between the ingots, and cooling can be performed quickly. As a result, it becomes possible to perform cooling uniformly from the entire surface of the ingot.
Moreover, in this embodiment, there exists an effect that a several ingot can be manufactured efficiently in the limited space.

Other variations (non-rectangular ingot + cooling member)
FIG. 20 shows a cross-sectional view of a drawn ingot according to another modification of the present invention. As shown in FIG. 20A, the present invention can also be applied to an ingot 23 having a circular cross section, and the cooling member 66 in this case is similar to the rectangular ingot in that the surface of the ingot 23 and a predetermined It has a circular cross section that surrounds the entire circumference of the ingot at an interval, and extends in the ingot drawing direction.

  Furthermore, as shown in FIG. 20B, a coil-shaped cooling member 67 can surround the entire circumference of the circular ingot.

  Further, as shown in the plan view of FIG. 21, a plurality of molds 16 are provided in parallel in the melting portion 40, and the lower extraction portion 50 surrounds a part of the ingot as an outer cylinder constituting the extraction portion 50. It can also be set as the extraction part outer cylinder 51 which combined what is a C-shaped cross-section with one part opened. 21 illustrates a modification of the extraction portion outer cylinder 51, and the cooling member is not shown in the drawing, but the various cooling members described in the present specification are shown in FIG. It can arrange | position suitably in the aspect shown.

  Further, as shown in FIG. 22, in the present invention, the cooling member is not installed from below the ingot as described above, but a plate-like member made of, for example, a copper plate or the like is fixed to the lower end of the mold 16 with the fixture 72. It is also possible to adopt a mode in which the mold 16 is extended from the upper side to the lower side. When the ingot cross section is rectangular, as shown in FIG. 22 (b), when the ingot cross section is circular, as shown in FIG. 22 (c), the plate member 70 or 71 is installed so as to surround the ingot. Can do. In either case, coil-like cooling members 63 and 67 are disposed around the plate-like members 70 and 71, and the ingot can be cooled via the plate-like member by removing heat from the cooling member.

  Although not shown in the figure, similarly to the aspect described in the item of the rectangular ingot, the single ingot 23 and the cooling member shown in FIGS. 20A and 20B can be arranged in a plurality of rows in parallel. As shown in FIG. 20 (c), a cooling member 68 surrounding a part of the circumference of the circular ingot can be disposed between the plurality of circular ingots 23.

  Further, although not shown in the drawings, the present invention is not limited to rectangular or circular ingots, and can be manufactured such that the cross section is an ellipse, a barrel, an indeterminate shape composed of polygons or other curves. As long as it has a shape, it can be applied to ingots having any cross-sectional shape, and in any case, the ingot row can be set to a single or a plurality of ingots. Or it has the shape which surrounds a part of circumference | surroundings, and a cooling member is extended so that a predetermined distance may be maintained with respect to the surface of an ingot, It is characterized by the above-mentioned.

  The cooling member for cooling the metal ingot is made of a metal having good heat conduction, and it is desirable to use a refrigerant for the member itself. The cooling method may be a method of cooling the entire surface of the copper member by making the member a jacket structure, a method of previously providing a coolant channel in the cooling member, and cooling the member through the channel, or a metal There is a method in which the pipe is coiled and attached to the surface of the cooling member to cool the cooling member. By using these methods, heat radiation from the ingot can be efficiently extracted.

  The material of the cooling member can be arbitrarily selected as long as it exhibits a heat transfer effect, and metals, ceramics, heat-resistant engineering plastics, and the like can be used. Those having excellent thermal conductivity such as aluminum and iron can be suitably used.

  Moreover, water, an organic solvent, oil, or gas can also be used for a refrigerant | coolant.

  As another cooling method of the cooling member, a material in which two or more kinds of different metals are bonded as a cooling member is used, and a so-called Peltier effect that is expressed by flowing a direct current through the member is used to face the ingot side. It is also possible to use a method of cooling the member surface while dissipating heat to the opposite side of the member alone or in combination with the cooling method using the refrigerant. At this time, as a member, a clad material of copper and constantan (copper / nickel alloy), a clad material of copper and nickel / chromium alloy, or the like can be used as a suitable material.

  By producing a metal ingot according to the present invention as described above, it is possible to quickly cool, and to suppress deterioration due to air oxidation of the ingot and improve the production efficiency of the ingot. Moreover, since the heat release of the ingot can be performed uniformly in all directions, it is possible to prevent deformation due to the non-uniform temperature distribution of the ingot.

[Example 1]
As shown in FIG. 10, the cooling time of the ingot when the cooling member is arranged so as to surround the periphery of the ingot (φ100) held at 1000 ° C. in the mold 16, and the ingot when the cooling member is not used The cooling time required for the sample to be cooled to 300 ° C. was measured.
Here, water-cooled copper was used as the cooling member.

[Example 2]
In Example 1, the cooling time of the ingot was measured under the same conditions except that the cooling member of FIG. 11 was used instead of FIG.

[Example 3]
In Example 1, the cooling time of the ingot was measured under the same conditions except that the cooling member of FIG. 12 was used instead of FIG.

[Example 4]
In Example 1, the cooling time of the ingot was measured under the same conditions except that the cooling member of FIG. 14 was used instead of FIG.

[Example 5]
In Example 1, the cooling time of the ingot was measured under the same conditions except that the cooling member of FIG. 15 was used instead of FIG.

  From the above examples, it was confirmed that the ingot produced by the mold can be effectively cooled by using the cooling member in any case.

  While contributing to the improvement of the manufacturing efficiency in manufacture of a refractory metal ingot, the deterioration and deformation | transformation by air oxidation of the manufactured ingot can also be suppressed.

10 ... Raw material supply machine,
11 ... Raw material transfer machine,
12 ... raw materials,
13 ... Haas,
14, 15 ... Electron beam irradiation machine,
16 ... mold,
17-19 ... 樋,
20 ... molten metal,
21 ... Melting pool,
22: Ingot (rectangular section),
23 ... Ingot (circular cross section),
30 ... Ingot drawing jig,
40: dissolution part,
41. Dissolving part outer cylinder,
50 ... Pull-out part,
51. Pull-out part outer cylinder,
60 ... Cooling member (flat jacket),
61 ... Cooling member (U-shaped jacket),
62 ... Cooling member (r-shaped jacket),
63, 67 ... Cooling member (coil)
64, 65 ... cooling member (triangular prism jacket),
66 ... Cooling member (circular),
68 ... Cooling member,
70 ... a plate-shaped member,
71 ... a plate-like member (circular),
72. Fixing tool.

Claims (10)

A raw material feeder, a heating source for melting the raw material, a hearth for holding a molten metal generated by melting the raw material, a melting part having a plurality of molds charged with the molten metal, and a lower part of the melting part A melting furnace for producing metal, comprising: an ingot drawing portion provided with a plurality of drawing jigs for drawing out an ingot in which the molten metal is cooled and solidified in the plurality of molds; and a drawing portion outer cylinder installed on the outside thereof. ,
A melting furnace for producing metal, characterized in that a cooling member is disposed between at least the plurality of ingots in the drawing portion outer cylinder. The melting furnace for metal production according to claim 1, wherein a cooling member is also disposed between the drawing portion outer cylinder and the ingot. The melting furnace for metal production according to claim 1 or 2 , wherein the cooling member is disposed so as to extend a predetermined distance along the surface of the generated ingot. The melting furnace for metal production according to any one of claims 1 to 3, wherein the cooling member surrounds the entire circumference or a part of the circumference of the ingot in a cross section perpendicular to the drawing direction of the generated ingot. . The melting furnace for metal production according to any one of claims 1 to 4 , wherein a cross section of the ingot is rectangular, circular, elliptical, barrel-shaped, polygonal, or indefinite. The said cooling member is comprised with the water-cooled copper jacket or the water-cooled copper coil, The melting furnace for metal manufacture in any one of Claims 1-5 characterized by the above-mentioned.   The melting furnace for metal production according to claim 6, wherein a plurality of molds are arranged in the drawing portion so that the longitudinal surfaces of the ingot can be extracted with the same distance from each other.   The melting furnace for metal production according to claim 6, wherein a plurality of molds are arranged in the drawing portion so that the longitudinal surface of the ingot can be drawn out while maintaining a radial shape.   The melting furnace for metal production according to any one of claims 1 to 8, wherein the melting furnace is an electron beam melting furnace or a plasma arc melting furnace. The melting furnace for producing metal according to claim 1, wherein the heating source is an electron beam or a plasma arc.

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