WO2011158477A1 - Process for production of aluminum alloy cast bar, continuous casting device, and electromagnetic stirring coil for continuous casting device - Google Patents

Abstract

In the production of an aluminum alloy cast bar (R) for semi-melt-molding processing by carrying out continuous casting while electromagnetically stirring an molten aluminum alloy (M) by means of an electromagnetic stirring coil (5), the aluminum alloy cast bar is produced using a hypoeutectic Al-Si-based alloy comprising 3.0 to 10.0 mass% of Si and a reminder made up by Al, 1.0 mass% or less of Fe, a trace amount of an additive and unavoidable impurities as a material for the aluminum alloy cast bar and using an electromagnetic stirring coil in which the magnetic pole of the rotating magnetic field that is generated upon the conduction of a three-phase alternate current electric power to multiple coil elements (C) is bipolar as a whole as the electromagnetic stirring coil (5).

Description

Aluminum alloy casting rod manufacturing method, continuous casting apparatus, and electromagnetic stirring coil for continuous casting apparatus

The present invention relates to a method for producing an aluminum alloy cast bar for semi-melt forming, a continuous casting apparatus used in the method, and an electromagnetic stirring coil used in the continuous casting apparatus.

As a method for forming an aluminum alloy cast rod into a required shape, a method called a semi-melt forming method is known. In this semi-molten molding method, the material to be molded is heated to a temperature at which it is in a semi-molten state where the solid phase and the liquid phase coexist, and then transferred into a mold and pressed to form the required shape. In the semi-molten state where the solid phase and the liquid phase coexist, the fluidity is higher than the single-phase state with only the solid phase, so it can be easily formed into a complex shape even with a small pressure. In addition, since the fluidity is not as high as when the phase state is a single liquid phase, there is an advantage that entrainment of foreign substances such as bubbles can be suppressed during molding.

An aluminum alloy casting rod formed by such a semi-melt forming method is obtained by melting the alloy components to obtain a molten aluminum alloy, and then adjusting the chemical composition of the obtained molten aluminum alloy to form a rod shape. As a method of casting a molten aluminum alloy into a rod shape, a molten alloy such as aluminum is supplied from a hot top of a continuous casting apparatus to a mold disposed below the hot top. A continuous casting method is used in which the molten alloy supplied to the mold is cooled and solidified, and the solidified molten alloy is drawn downward from the mold and continuously cast.

When producing an aluminum alloy casting rod for semi-melt forming using the continuous casting method, the solidification of the molten aluminum alloy diffuses the eutectic alloy component into the liquid phase and the peritectic alloy component in the solid phase. As it progresses while diffusing in, the eutectic alloy component content is high around the growing solid phase crystal, and the peritectic alloy component content is low, which lowers the solidification start temperature of the liquid phase. . On the other hand, the solidification start temperature of the liquid phase does not decrease in places other than the surrounding solid phase crystal during growth, and the liquid phase other than the solid phase crystal is relatively inferior to the liquid phase around the solid phase crystal. Since it is easy to solidify, dendritic crystals are generated when an aluminum alloy cast bar for semi-melt forming is manufactured by continuously casting a molten aluminum alloy.

Since dendritic crystals have a higher melting point than the part between the dendrites, even if an aluminum alloy cast rod manufactured by continuous casting is heated to a temperature at which it is in a semi-molten state where the solid and liquid phases coexist, the dendritic crystals Does not melt and remains as a solid phase in a state where the tree branches are intertwined. Therefore, when a dendritic crystal is generated when an aluminum alloy cast rod for semi-molten forming is produced by continuously casting molten aluminum alloy, the aluminum alloy cast rod is formed by the semi-melt forming method. The fluidity of the molten aluminum alloy is significantly reduced, and a high pressure is required for the forming process.

In addition, when dendritic crystals are generated and grown during the manufacture of an aluminum alloy cast bar, the metal structure of the aluminum alloy cast bar is not a fine and uniform granular metal structure throughout the aluminum alloy cast bar. The more distributed points, the lower the fluidity, and a larger pressing force is required for the molding process. For this reason, depending on the non-uniformity of the distribution of crystal grain sizes, the pressing force required for molding changes, and the molding process conditions cannot be stabilized. Therefore, in order to stabilize the forming conditions of the aluminum alloy casting rod, the formation of dendritic crystals is suppressed during the casting of the molten aluminum alloy, and the metal structure of the aluminum alloy casting rod is fine and uniform throughout the aluminum alloy casting rod. It is important to have a granular metal structure.

Therefore, as a method for suppressing the formation of dendritic crystals during casting of the molten aluminum alloy, a method of continuously casting the molten aluminum alloy while performing mechanical stirring, electromagnetic stirring, etc. on the molten aluminum alloy has been proposed (for example, Patent Document 1, Patent Document 2, and Patent Document 3).

Japanese Patent Laid-Open No. 07-068345 Japanese Patent No. 2967415 Japanese Patent Laid-Open No. 07-051820

However, in the method disclosed in Patent Document 1, since the aluminum alloy melt is continuously cast in an centripetal magnetic field while electromagnetically stirring, as described in paragraph 0011 of Patent Document 3, the molten aluminum alloy is used. Compared with the case of electromagnetic stirring in the form of a rotating magnetic field, the fluidity of the molten aluminum alloy is reduced, and fine and uniform crystal grains may not be obtained.
On the other hand, in the invention disclosed in Patent Document 2, although the aluminum alloy melt is electromagnetically stirred in the form of a rotating magnetic field, the magnetic pole for generating the rotating magnetic field uses an electromagnetic stirring coil having four poles. There is a possibility that the magnetic flux density of the rotating magnetic field generated on the inner diameter side of the mold and the hot top becomes low at the center of the mold and the hot top, and the generation of dendritic crystals cannot be effectively suppressed.

In the invention disclosed in Patent Document 3, since the solidification temperature range is narrow and the ratio of the sump to the ingot diameter is about 0.2 to 0.5, the electromagnetic stirring mode is a rotating magnetic field. There is a possibility that the formation of dendritic crystals cannot be effectively suppressed due to a decrease in convection between the central portion and the outer peripheral portion of the aluminum alloy casting rod.
The present invention has been made to solve such a problem, and an object of the present invention is to provide an aluminum alloy cast bar manufacturing method capable of manufacturing an aluminum alloy cast bar suitable for semi-melt forming. To do.

Another object of the present invention is to provide a continuous casting apparatus capable of obtaining an aluminum alloy cast rod suitable for semi-melt forming.
Another object of the present invention is to provide an electromagnetic stirring coil for a continuous casting apparatus capable of effectively suppressing the formation of dendritic crystals when an aluminum alloy cast bar is produced by continuously casting molten aluminum alloy. To do.

When the present inventors continuously cast a molten aluminum alloy in a bar shape while electromagnetically stirring in a rotating magnetic field using a commercial power source, the metal structure of the aluminum alloy cast bar becomes a fine and uniform granular metal structure, and Studies have been made on methods suitable for application to the semi-melt molding process. In the process, as the material of the aluminum alloy cast rod, it contains 3.0 to 10.0% by mass of Si, and the balance is Al, 1.0% by mass or less of Fe, trace additives and inevitable impurities. When the hypoeutectic Al-Si alloy is used, even if the magnetic stirring of the aluminum alloy melt is a rotating magnetic field using a commercial three-phase AC power source of 50 Hz to 60 Hz, the entire magnetic stirring coil has two magnetic poles. If there is, it is possible to divide the dendritic portion of the dendritic crystal, and as a result, the knowledge that the metal structure of the aluminum alloy cast bar becomes a fine and uniform granular metal structure throughout the aluminum alloy cast bar is obtained. The present invention has been completed.

In order to solve the above problems, a method for producing an aluminum alloy cast rod according to an aspect of the present invention is a method for producing an aluminum alloy cast rod for semi-molten forming by continuously casting a molten aluminum alloy, As a continuous casting apparatus for continuously casting the molten aluminum alloy, a cylindrical mold for casting the molten aluminum alloy in a rod shape, and the mold is disposed on the mold so that the center of the molten metal is aligned with the center. A cylindrical hot top to be supplied to the mold; and an electromagnetic stirring coil for electromagnetically stirring the molten aluminum alloy inside the mold and the hot top; and the electromagnetic stirring coil supplies the molten aluminum alloy to the mold. A plurality of coil elements electromagnetically induced in a circumferential direction of the hot top; A continuous casting apparatus having an iron core held on the outer periphery of the steel plate, and containing 3.0 to 10.0% by mass of Si as the material of the aluminum alloy casting rod, with the balance being Al, 1.0% Rotation that occurs when three-phase AC power is applied to the coil element as a magnetic stirrer coil using a hypoeutectic Al-Si-based alloy consisting of Fe of less than mass%, trace additives and inevitable impurities The aluminum alloy casting rod is manufactured by using a magnetic stirring coil having two magnetic poles in the entire magnetic stirring coil.

While Fe is a major inevitable impurity in Al ingots, it may be added in the range of 1.0% by mass or less for the purpose of improving castability and / or semi-melt molding processability. Since the method for producing an aluminum alloy cast rod according to an aspect of the present invention is characterized in that no Al—Fe-based intermetallic compound is formed, Fe may be contained in an amount of 1.0% by mass or less. , May not be contained.

In another aspect of the present invention, the aluminum alloy casting rod material includes 5.0 to 7.5% by mass of Si, the balance being Al, 0.50% by mass or less of Fe, and a trace additive. As below 0.70 mass% Mg, 0.50 mass% or less Mn, 0.50 mass% or less Cu, 0.20 mass% or less Ti, 0.07 mass% Be, and inevitable impurities This is a method for producing an aluminum alloy casting rod using a hypoeutectic Al—Si alloy.

In another aspect of the present invention, the material for the aluminum alloy casting rod contains 6.5 to 7.5% by mass of Si, the balance being Al, 0.20% by mass or less of Fe, 0.20 to Sub-comprising 0.45 mass% Mg, 0.20 mass% or less Cu, 0.10 mass% or less Zn, 0.10 mass% or less Mn, 0.02 mass% or less Ti and inevitable impurities A eutectic Al-Si alloy, or containing 6.5 to 7.5% by mass of Si and the balance being Al, 0.20% by mass or less of Fe, 0.40 to 0.70% by mass of Mg, Cu of 0.20 mass% or less, Zn of 0.10 mass% or less, Mn of 0.10 mass% or less, Ti of 0.04 to 0.20 mass% or less, 0.04 to 0.07 mass% or less Cast aluminum alloy using hypoeutectic Al-Si alloy consisting of Be and inevitable impurities It is a method of manufacturing a rod.

Another aspect of the present invention is a method for producing an aluminum alloy cast bar in which the current value of the three-phase AC power is set to 5A to 20A and the molten aluminum alloy is electromagnetically stirred.
Another aspect of the present invention is a method for producing an aluminum alloy cast bar in which the magnetic flux density of the rotating magnetic field is set to 7 mT to 28 mT and the molten aluminum alloy is electromagnetically stirred.

In another aspect of the present invention, the primary crystal Al crystal of the molten aluminum alloy continuously cast by the continuous casting apparatus is granular throughout the aluminum alloy cast bar, and the average grain size is 30 μm to 100 μm, with a standard deviation. Is a method for producing an aluminum alloy casting rod, wherein the aluminum alloy casting rod is produced while electromagnetically stirring the molten aluminum alloy with the electromagnetic stirring coil so that the average particle size becomes 1/3 or less.
Another aspect of the present invention is a method for manufacturing an aluminum alloy cast bar, wherein the aluminum alloy cast bar is manufactured by casting the molten aluminum alloy into a bar shape with a diameter of 70 mm to 120 mm using the mold.

A continuous casting apparatus according to another aspect of the present invention is used when producing an aluminum alloy cast bar for semi-melt forming, contains 3.0 to 10.0% by mass of Si, and the balance is Al. A cylindrical mold that casts a hypoeutectic Al-Si alloy melt consisting of 1.0 mass% or less of Fe, a trace additive, and inevitable impurities into a rod shape, and the mold is aligned with the center of the mold A cylindrical hot top for supplying the molten aluminum alloy to the mold, and an electromagnetic stirring coil for electromagnetically stirring the molten Al—Si alloy inside the mold and the hot top. A plurality of coil elements that electromagnetically induce the molten Al-Si alloy in the circumferential direction of the mold and the hot top, and an iron core that holds the coil elements on the mold and the outer periphery of the hot top. The coil is a continuous casting apparatus, wherein the magnetic stirring coil is a two-pole magnetic stirring coil in which the magnetic pole of the rotating magnetic field generated when three-phase AC power is supplied to the coil element It is characterized by.

In another aspect of the present invention, the iron core is formed in a cylindrical shape with an inner diameter larger than the outer diameter of the mold and the hot top, and the outer periphery of the mold and the hot top is aligned with the center of the mold. Is a continuous casting apparatus.
Another aspect of the present invention is a continuous casting apparatus in which the number of coil elements is a multiple of six.
Another aspect of the present invention is a continuous casting apparatus in which the iron core has a plurality of slots formed at regular intervals on the inner peripheral surface of the iron core corresponding to the coil element.

In another aspect of the present invention, the coil element is configured to coil a copper wire between two slots formed on the inner peripheral surface of the iron core by being shifted by 120 ° in the circumferential direction of the iron core among the plurality of slots. It is a continuous casting apparatus formed by winding in a shape.
Another aspect of the present invention is a continuous casting apparatus in which the slot has a width of 6.0 mm to 12.0 mm and the slot has a depth of 15.0 mm to 35.0 mm.
Another aspect of the present invention is a continuous casting apparatus in which the surface of the copper wire is coated with insulation.
Another aspect of the present invention is a continuous casting apparatus in which the copper wire has a wire diameter of 0.6 mm to 1.7 mm and the number of turns of the copper wire is 33 to 67.

Another aspect of the present invention is a continuous casting apparatus in which the mold has a height of 30 mm to 60 mm, the hot top has a height of 100 mm to 300 mm, and the iron core has a height of 20 mm to 50 mm.
Another aspect of the present invention is a continuous casting apparatus in which the iron core is formed by laminating a plurality of electromagnetic steel plates having a thickness of 0.3 mm to 0.7 mm.
Another aspect of the present invention is a continuous casting apparatus in which the mold has a height of 30 mm to 60 mm, the hot top has a height of 100 mm to 300 mm, and the iron core has a height of 20 mm to 50 mm.

In another aspect of the present invention, the number of the coil elements is 36, and the first to sixth, seventh to twelfth, thirteenth to eighteenth, and nineteenth to twenty-fourth of the 36 coil elements. The 25th to 30th, 31st to 36th coil elements are connected in series, and the 1st, 18th, 24th and 31st coil elements are connected to the U-phase terminal of the three-phase AC power source, The 12th, 19th, and 25th coil elements are connected to the V-phase terminal of the three-phase AC power supply, and the 7th, 13th, 30th, and 36th coil elements are connected to the W-phase terminal of the three-phase AC power supply. Continuous casting equipment.

In another aspect of the present invention, the number of the coil elements is 42, and the first to seventh, eighth to fourteenth, fifteenth to twenty-first, twenty-second to twenty-eighth among the 42 coil elements. The 29th to 35th, 36th to 42nd coil elements are connected in series, and the first, 21st, 28th and 36th coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply. The 14th, 22nd and 29th coil elements are connected to the V-phase power supply terminal of the three-phase AC power supply, and the 8th, 15th, 35th and 42nd coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. It is a continuous casting device.

In another aspect of the present invention, the number of the coil elements is 48, and the first to eighth, ninth to sixteenth, seventeenth to twenty-fourth, twenty-fifth to thirty-second of the 48 coil elements. The thirty-third to forty-fourth, forty-first to forty-eighth coil elements are connected in series, and the first, twenty-fourth, thirty-second and forty-first coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply. The 16th, 25th and 33rd coil elements are connected to the V-phase power supply terminal of the three-phase AC power supply, and the ninth, 17th, 40th and 48th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. It is a continuous casting device.

In another aspect of the present invention, the number of the coil elements is 54, and the first to ninth, tenth to eighteenth, nineteenth to twenty-seventh, twenty-eighth to thirty-sixth of the 54 coil elements. The 37th to 45th, 46th to 54th coil elements are connected in series, and the first, 27th, 36th and 46th coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, The 18th, 28th, and 37th coil elements are connected to the V-phase power supply terminal of the three-phase AC power supply, and the 10th, 19th, 45th, and 54th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. It is a continuous casting device.

In another aspect of the present invention, the number of the coil elements is 60, and the first to the tenth, the eleventh to the twentieth, the twenty-first to the thirtieth, the thirty-first to the forty-fourth of the 60 coil elements. The 41st to 50th, 51st to 60th coil elements are connected in series, and the 1st, 30th, 40th and 51st coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply. The 20th, 31st and 41st coil elements are connected to the V-phase power supply terminal of the three-phase AC power supply, and the 11th, 21st, 50th and 60th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. It is a continuous casting device.

An electromagnetic stirring coil for a continuous casting apparatus according to another aspect of the present invention includes a cylindrical mold for casting a molten aluminum alloy in a rod shape, and the mold is disposed on the mold so that the center coincides with the mold. A plurality of coil elements used in a continuous casting apparatus including a cylindrical hot top for supplying molten metal to the mold, and electromagnetically inducing the molten aluminum alloy in a circumferential direction of the mold and the hot top; and the coil An electromagnetic stirring coil for a continuous casting apparatus having an element that holds the mold and an iron core that holds the outer periphery of the hot top, wherein the magnetic pole of the rotating magnetic field generated when three-phase AC power is applied to the coil element The entire coil has two poles.

Another aspect of the present invention is an electromagnetic stirring coil for a continuous casting apparatus, wherein the number of coil elements is a multiple of six.
Another aspect of the present invention is an electromagnetic stirring coil for a continuous casting apparatus, wherein the iron core has a plurality of slots formed at regular intervals on the inner peripheral surface of the iron core corresponding to the coil element.
In another aspect of the present invention, the coil element is configured to coil a copper wire between two slots formed on the inner peripheral surface of the iron core by being shifted by 120 degrees in the circumferential direction of the iron core among the plurality of slots. It is the electromagnetic stirring coil for continuous casting apparatuses formed by winding in the shape.
Another aspect of the present invention is an electromagnetic stirring coil for a continuous casting apparatus in which the surface of the copper wire is coated with insulation.

Another aspect of the present invention is an electromagnetic stirring coil for a continuous casting apparatus, wherein the copper wire has a wire diameter of 0.6 mm to 1.7 mm and the number of turns of the copper wire is 33 to 67.
In another aspect of the present invention, the number of the coil elements is 36, and the first to sixth, seventh to twelfth, thirteenth to eighteenth, and nineteenth to twenty-fourth of the 36 coil elements. The 25th to 30th, 31st to 36th coil elements are connected in series, and the 1st, 18th, 24th and 31st coil elements are connected to the U-phase terminal of the three-phase AC power source, The 12th, 19th, and 25th coil elements are connected to the V-phase terminal of the three-phase AC power supply, and the 7th, 13th, 30th, and 36th coil elements are connected to the W-phase terminal of the three-phase AC power supply. It is an electromagnetic stirring coil for continuous casting apparatuses.

In another aspect of the present invention, the number of the coil elements is 42, and the first to seventh, eighth to fourteenth, fifteenth to twenty-first, twenty-second to twenty-eighth among the 42 coil elements. The 29th to 35th, 36th to 42nd coil elements are connected in series, and the first, 21st, 28th and 36th coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply. The 14th, 22nd and 29th coil elements are connected to the V-phase power supply terminal of the three-phase AC power supply, and the 8th, 15th, 35th and 42nd coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. This is an electromagnetic stirring coil for a continuous casting apparatus.

In another aspect of the present invention, the number of the coil elements is 48, and the first to eighth, ninth to sixteenth, seventeenth to twenty-fourth, twenty-fifth to thirty-second of the 48 coil elements. The thirty-third to forty-fourth, forty-first to forty-eighth coil elements are connected in series, and the first, twenty-fourth, thirty-second and forty-first coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply. The 16th, 25th and 33rd coil elements are connected to the V-phase power supply terminal of the three-phase AC power supply, and the ninth, 17th, 40th and 48th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. This is an electromagnetic stirring coil for a continuous casting apparatus.

In another aspect of the present invention, the number of the coil elements is 54, and the first to ninth, tenth to eighteenth, nineteenth to twenty-seventh, twenty-eighth to thirty-sixth of the 54 coil elements. The 37th to 45th, 46th to 54th coil elements are connected in series, and the first, 27th, 36th and 46th coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, The 18th, 28th, and 37th coil elements are connected to the V-phase power supply terminal of the three-phase AC power supply, and the 10th, 19th, 45th, and 54th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. This is an electromagnetic stirring coil for a continuous casting apparatus.

In another aspect of the present invention, the number of the coil elements is 60, and the first to the tenth, the eleventh to the twentieth, the twenty-first to the thirtieth, the thirty-first to the forty-thousands of the 60 coil elements. The 41st to 50th, 51st to 60th coil elements are connected in series, and the 1st, 30th, 40th and 51st coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply. The 20th, 31st and 41st coil elements are connected to the V-phase power supply terminal of the three-phase AC power supply, and the 11th, 21st, 50th and 60th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. This is an electromagnetic stirring coil for a continuous casting apparatus.

According to the present invention, the dendritic crystals generated during the casting of the molten aluminum alloy are divided by the electromagnetic stirring in the circumferential direction. Therefore, when the semi-melt forming process is performed, the dendritic crystals are in a state of being intertwined with each other. It can suppress remaining as a phase. In addition, the magnetic flux generated between the two magnetic poles of the electromagnetic stirring coil passes through the central part of the mold and the hot top, and the magnetic stirring of the N pole and S pole generated on the inner diameter side of the iron core is four poles. As in the case of using a coil, the electromagnetic stirring force of the electromagnetic stirring coil does not weaken at the center of the mold and the hot top. Therefore, even if dendritic crystals are generated during solidification of the molten aluminum alloy, the dendritic portion of the dendritic crystals can be reliably divided, and the metal structure of the aluminum alloy casting rod is fine and uniform granular metal throughout the aluminum alloy casting rod. Since it becomes a structure, an aluminum alloy cast bar suitable for semi-melt forming can be manufactured. In addition, since the power supply circuit and the control mechanism are simple, an aluminum alloy cast rod suitable for semi-melt forming can be manufactured in a large amount and stably.

It is a figure which shows an example of the continuous casting apparatus used when manufacturing the aluminum alloy casting rod for semi-molten forming processes. It is a figure which shows an example of the electromagnetic stirring coil which electromagnetically stirs aluminum alloy molten metal. It is a figure which shows typically the shape of the coil element of an electromagnetic stirring coil. It is a top view which shows the iron core of an electromagnetic stirring coil in case the number of coil elements is 48 pieces. It is a top view which shows the iron core of an electromagnetic stirring coil in case the number of coil elements is 36 pieces. It is a top view which shows the iron core of an electromagnetic stirring coil in case the number of coil elements is 42 pieces. It is a top view which shows the iron core of an electromagnetic stirring coil in case the number of coil elements is 54 pieces. It is a top view which shows the iron core of an electromagnetic stirring coil in case the number of coil elements is 60 pieces. It is a figure which shows the electrical constitution of an electromagnetic stirring coil in case the number of coil elements is 36 pieces. It is a figure which shows the electrical structure of an electromagnetic stirring coil in case the number of coil elements is 42 pieces. It is a figure which shows the electrical structure of an electromagnetic stirring coil in case the number of coil elements is 48 pieces. It is a figure which shows the electrical structure of an electromagnetic stirring coil in case the number of coil elements is 54 pieces. It is a figure which shows the electrical constitution of an electromagnetic stirring coil in case the number of coil elements is 60 pieces. It is a figure which shows the metal structure photograph of the aluminum alloy casting rod obtained by the Example and comparative example of this invention. It is a figure which shows typically the analysis range when analyzing the metal structure of the aluminum alloy casting rod obtained by the Example and comparative example of this invention by SEM-EBSD.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 is a view showing an example of a continuous casting apparatus used when manufacturing an aluminum alloy casting rod for semi-melt forming. The continuous casting apparatus 1 shown in FIG. 1 includes a mold 2, a hot top 3, an electromagnetic stirrer. A coil 5 and a power regulator 6 are provided.
The mold 2 is for casting a molten aluminum alloy M into a rod shape. For example, the mold 2 is formed into a cylindrical shape with an outer diameter of 130 mm to 170 mm, an inner diameter of 70 mm to 120 mm, and a height of 30 mm to 60 mm. It is formed from a metal material having good thermal conductivity such as an alloy.

The mold 2 has a water cooling space 21 for cooling the molten aluminum alloy M with cooling water. The water cooling space 21 is formed between the inner peripheral wall portion and the outer peripheral wall portion of the mold 2 over the entire circumference of the mold 2. Has been. Further, the mold 2 has a cooling water injection port 22 for injecting the cooling water supplied to the water cooling space 21 onto the surface of the solidified shell that has come out of the mold 2, and this cooling water injection port 22 is connected to the inner peripheral wall portion of the mold 2. It is formed over the entire periphery of the mold 2 at the joint with the bottom plate.

The hot top 3 supplies the molten aluminum alloy M supplied from the molten metal supply rod 4 to the mold 2 and has, for example, an outer diameter of 130 mm to 170 mm, an inner diameter of 60 mm to 110 mm, and a height of 100 mm to 300 mm. It is formed in a cylindrical shape, and is placed on the mold 2 so that its center coincides with the mold 2. The hot top 3 has a molten metal inlet 31 for receiving the aluminum alloy molten metal M from the molten metal supply rod 4, and the molten metal inlet 31 is formed at the upper part of the outer peripheral surface of the hot top 3.

The electromagnetic stirring coil 5 electromagnetically stirs the molten aluminum alloy M inside the mold 2 and the hot top 3 and is configured to electromagnetically stir the molten aluminum alloy M by three-phase AC power from a commercial power source. . The electromagnetic stirring coil 5 is formed in a cylindrical shape so as to surround the upper part of the outer peripheral surface of the mold 2 and the lower part of the outer peripheral surface of the hot top 3, and is provided coaxially with the mold 2 and the hot top 3.

The power regulator 6 adjusts the three-phase AC power supplied to the coil element C of the electromagnetic stirring coil 5, and this power regulator 6 converts the three-phase AC power of the commercial three-phase AC power source, for example, the current value. It is configured to adjust to 5A to 20A.
The electromagnetic stirring coil 5 includes a plurality (for example, multiples of 6) of coil elements C for electromagnetically inducing the molten aluminum alloy M in the circumferential direction of the mold 2 and the hot top 3, and these coil elements C are connected to the mold 2 and the hot top. 3 and an iron core 51 that is held on the outer periphery.

The iron core 51 of the electromagnetic stirring coil 5 has an inner diameter (for example, 140 mm to 190 mm) larger than the outer diameter of the mold 2 and the hot top 3 within a range of 10 mm to 30 mm and an outer diameter (for example, 220 mm to 300 mm) larger than the inner diameter. And is arranged on the outer periphery of the mold 2 and the hot top 3 so that the center coincides with the mold 2.
When the height of the mold 2 is 30 mm to 60 mm and the height of the hot top 3 is 100 mm to 300 mm, the iron core 51 is formed in a cylindrical shape with a height of 20 mm to 30 mm, and 0.3 mm to 0 mm. It is formed by laminating a large number of non-oriented electrical steel sheets having a thickness of about 7 mm.

The reason why the thickness of the electromagnetic steel sheet forming the iron core 51 is set to 0.3 mm to 0.7 mm is that when the thickness of the electromagnetic steel sheet is less than 0.3 mm, the rigidity of the electromagnetic steel sheet is lowered and the mechanical strength of the iron core 51 is reduced. If the thickness of the electromagnetic steel sheet exceeds 0.7 mm, the eddy current in the electromagnetic steel sheet increases and the amount of heat generation increases, causing overheating. In addition, although the material of the iron core 51 can be used if it is a non-oriented electrical steel plate, a thing with an iron loss value as small as possible is preferable.

The iron core 51 of the electromagnetic stirring coil 5 has the same number of slots S as the coil elements C (see FIGS. 4 to 8). These slots S, for example, have a width of 6.0 mm to 12.0 mm and a depth of 15.0 mm to 35.0 mm, and are formed in a comb-like shape at regular intervals on the inner peripheral surface of the iron core 51.
Here, when the number of slots S is less than 36, the energy required to magnetize the iron core comb teeth portion 52 formed between two adjacent slots increases, and the electromagnetic stirring effect of the electromagnetic stirring coil 5 increases. Decreases and causes overheating. Further, when the number of slots S exceeds 60, the width of the iron comb teeth 52 is reduced and the magnetic flux is not concentrated. Therefore, the number of slots S formed on the inner peripheral surface of the iron core 51 is 6 × 6, It is preferably 6 × 7, 6 × 8, 6 × 9, or 6 × 10.

The coil element C of the electromagnetic stirring coil 5 is made of a copper wire whose surface is insulated and coated with enamel paint or the like. The wire diameter of the copper wire is 6.0 MA (megaampere) / m ² or less, Desirably, the thickness is set to 0.6 mm to 1.7 mm so as to be 5.0 MA (megaampere) / m ² or less.
In addition, each copper wire forming the coil element C has two magnetic poles of the rotating magnetic field generated when the coil element C is energized with three-phase AC power as shown in FIG. The mold 2 and the hot top 3 are wound in the shape of a coil between two slots S formed on the inner peripheral surface of the iron core 51 with a shift of 120 degrees in the circumferential direction. Here, the number of turns of the copper wire is 33 to 67 so that the magnetic flux density of the rotating magnetic field generated when the coil element C is supplied with three-phase AC power having a current value of 5A to 20A is 7 mT to 28 mT. It is preferable to set the time.

In order to prevent the two coil elements from short-circuiting in the slot, it is preferable that each coil element C is covered with a coil insulating paper. As the coil insulating paper, for example, Nitto Shinko Corporation (NITTO （SHINKO) Corporation, Sakai City, Fukui Prefecture, Japan) Insulation paper with high heat resistance, such as aramid paper and polyester resin laminated with urethane adhesive, sold as NTN222 (trade name) can be used. Furthermore, it is also preferable that each coil element C is solidified with an enamel paint or the like so that each copper wire forming the coil element C does not contact the upper and lower surfaces of the iron core 51.

When the number of coil elements C and slots S is 48, as shown in FIG. 4, coil elements C1, C2,..., C16, C17, C18,..., C32, C33, C34,. , S16, S17, S18, ..., S32, S33, S34, ..., S48 and slots S17, S18, ..., S32, S33, S34, ,..., S48, S1, S2,.

When the number of coil elements C and slots S is 36, as shown in FIG. 5, coil elements C1, C2,..., C12, C13, C14,..., C24, C25, C26,. , S12, S13, S14, ..., S24, S25, S26, ..., S36 and slots S13, S14, ..., S24, S25, S26, ,..., S36, S1, S2,.

When the number of coil elements C and slots S is 42, as shown in FIG. 6, coil elements C1, C2,..., C14, C15, C16,..., C28, C29, C30,. , S14, S15, S16, ..., S28, S29, S30, ..., S42 and slots S15, S16, ..., S28, S29, S30, ,..., S42, S1, S2,.

When the number of coil elements C and slots S is 54, as shown in FIG. 7, coil elements C1, C2,..., C18, C19, C20,..., C36, C37, C38,. , S18, S19, S20, ..., S36, S37, S38, ..., S54 and slots S19, S20, ..., S36, S37, S38, ,..., S54, S1, S2,.

When the number of coil elements C and slots S is 60, as shown in FIG. 8, coil elements C1, C2,..., C20, C21, C22,..., C40, C41, C42,. , S20, S21, S22, ..., S40, S41, S42, ..., S60 and slots S21, S22, ..., S40, S41, S42, ,..., S60, S1, S2,.

9 to 13 are diagrams showing the electrical configuration of the electromagnetic stirring coil when the number of coil elements is any of 36, 42, 48, 54, and 60. In the case of 36, as shown in FIG. 9, among the coil elements C1 to C36 of the electromagnetic stirring coil 5, the coil elements C1 to C6, the coil elements C7 to C12, the coil elements C13 to C18, the coil elements C19 to C24, the coil The elements C25 to C30 and the coil elements C31 to C36 are connected in series, respectively. The coil elements C1, C18, C24, and C31 are connected to the U-phase terminal T1 of the three-phase AC power supply, and the coil elements C6, C12, C19, and C25 are connected to the V-phase terminal T2 of the three-phase AC power supply, and the coil elements C7, C13, C30 and C36 are connected to the W-phase terminal T3 of the three-phase AC power source.

When the number of coil elements is 42, coil elements C1 to C7, coil elements C8 to C14, coil elements C15 to C21, coil elements among the coil elements C1 to C42 of the electromagnetic stirring coil 5, as shown in FIG. C22 to C28, coil elements C29 to C35, and coil elements C36 to C43 are respectively connected in series. The coil elements C1, C21, C28, and C36 are connected to the U-phase terminal T1 of the three-phase AC power supply, and the coil elements C7, C14, C22, and C29 are connected to the V-phase terminal T2 of the three-phase AC power supply, and the coil elements C8, C15, C35 and C42 are connected to the W-phase terminal T3 of the three-phase AC power source.

When the number of coil elements is 48, as shown in FIG. 11, among the coil elements C1 to C48 of the electromagnetic stirring coil 5, the coil elements C1 to C8, the coil elements C9 to C16, the coil elements C17 to C24, the coil elements C25 to C32, coil elements C33 to C40, and coil elements C41 to C48 are respectively connected in series. The coil elements C1, C24, C32, and C41 are connected to the U-phase terminal T1 of the three-phase AC power supply, and the coil elements C8, C16, C25, and C33 are connected to the V-phase terminal T2 of the three-phase AC power supply, and the coil elements C9, C17, C40 and C48 are connected to the W-phase terminal T3 of the three-phase AC power source.

When the number of coil elements is 54, as shown in FIG. 12, coil elements C1 to C9, coil elements C10 to C18, coil elements C19 to C27, coil elements among coil elements C1 to C54 of the electromagnetic stirring coil 5 are provided. C28 to C36, coil elements C37 to C45, and coil elements C46 to C54 are respectively connected in series. The coil elements C1, C27, C36, and C46 are connected to the U-phase terminal T1 of the three-phase AC power supply, and the coil elements C9, C18, C28, and C37 are connected to the V-phase terminal T2 of the three-phase AC power supply, and the coil elements C10, C19, C45 and C54 are connected to the W-phase terminal T3 of the three-phase AC power source.

When the number of coil elements is 60, coil elements C1 to C10, coil elements C11 to C20, coil elements C21 to C30, coil elements among the coil elements C1 to C60 of the electromagnetic stirring coil 5, as shown in FIG. C31 to C40, coil elements C41 to C50, and coil elements C51 to C60 are respectively connected in series. The coil elements C1, C30, C40, and C51 are connected to the U-phase terminal T1 of the three-phase AC power supply, and the coil elements C10, C20, C31, and C41 are connected to the V-phase terminal T2 of the three-phase AC power supply, and the coil elements C11, C21, C50 and C60 are connected to the W-phase terminal T3 of the three-phase AC power source.

In the case of producing an aluminum alloy cast bar for semi-melt forming using the continuous casting apparatus shown in FIG. 1, the material of the aluminum alloy cast bar contains 3.0 to 10.0% by mass of Si, And the balance contains hypoeutectic Al-Si alloy composed of Al, 1.0 mass% or less of Fe, trace additives and inevitable impurities, preferably 5.0 to 7.5 mass% or less of Si. And a hypoeutectic Al—Si based alloy consisting of Al, 0.20% by mass or less of Fe, and a trace amount of additives and inevitable impurities, more preferably an A356.0 alloy or an A357.0 alloy shown in Table 1. A hypoeutectic Al—Si based alloy shown as follows is used, and this hypoeutectic Al—Si based alloy is melted in a melting furnace to obtain a molten aluminum alloy M. Then, the molten aluminum alloy M obtained in the melting furnace is supplied from the molten metal supply rod 4 to the hot top 3.

The molten aluminum alloy M supplied to the hot top 3 flows down the inner diameter side of the hot top 3 and flows into the mold 2. Then, the molten aluminum alloy M flowing into the mold 2 is cooled by the cooling water supplied to the water cooling space 21 of the mold 2 and becomes an aluminum alloy casting rod R in a rod shape from the lower surface of the mold 2 as shown in FIG. Pulled out.

At this time, three-phase alternating current power having an alternating frequency of 50 Hz to 60 Hz and a current value of 5 A to 20 A is supplied from the power regulator 6 to the electromagnetic stirring coil 5, and the three-phase alternating current supplied from the power regulator 6 to the electromagnetic stirring coil 5. A rotating magnetic field having a magnetic flux density of 7 mT to 28 mT is generated on the inner diameter side of the mold 2 and the hot top 3 by electric power. The molten aluminum alloy M is continuously cast in a rod shape while being magnetically stirred in the circumferential direction of the mold 2 and the hot top 3 by the rotating magnetic field generated on the inner diameter side of the mold 2 and the hot top 3. The dendritic portion of the dendritic crystal generated with cooling is divided by electromagnetic stirring.

As in the above-described embodiment of the present invention, the material of the aluminum alloy casting rod includes 3.0 to 10.0% by mass of Si, the balance being Al, 1.0% by mass or less of Fe, A hypoeutectic Al-Si alloy consisting of a trace amount of additives and inevitable impurities is used, but the dendritic crystals generated during casting of the molten aluminum alloy are separated by electromagnetic stirring in the circumferential direction. Therefore, it can suppress that the dendritic part of the dendritic crystal remains as a solid phase in an intertwined state.

Further, the material of the aluminum alloy casting rod contains 5.0 to 7.5% by mass of Si, the balance being Al, 0.50% by mass or less of Fe, and 0.70% by mass or less as a trace additive. Mg, 0.50% by mass or less of Cu, 0.50% by mass or less of Cu, 0.20% by mass or less of Ti, 0.07% by mass of Be, and hypoeutectic Al—Si By using an Al alloy, Al is contained by 7% by mass of Si, 0.86% by mass of Fe, and 0.67% by mass of Mn as in the Al alloy described in paragraph No. 0031 of Patent Document 2. -Fe-based intermetallic compounds are neither generated nor segregated.

In addition, as an electromagnetic stirring coil for electromagnetically stirring the molten aluminum alloy, the magnetic pole generated to generate a rotating magnetic field is a two-pole electromagnetic stirring coil 5 for the entire electromagnetic stirring coil. The electromagnetic stirring force of the electromagnetic stirring coil is passed through the central part of the mold 2 and the hot top 3 and the magnetic stirring force of the electromagnetic stirring coil is the same as that of the mold and hot, as in the case of using the electromagnetic stirring coil having four poles for generating the rotating magnetic field. There is no weakening in the center of the top. Therefore, even if dendritic crystals are generated during solidification of the molten aluminum alloy, the dendritic portion of the dendritic crystals can be reliably divided, and the metal structure of the aluminum alloy casting rod is fine and uniform granular metal throughout the aluminum alloy casting rod. Since it becomes a structure, an aluminum alloy cast bar suitable for semi-melt forming can be manufactured.

Further, as an electromagnetic stirring coil for electromagnetically stirring the molten aluminum alloy, a rotating magnetic field is generated on the inner diameter side of the mold 2 and the hot top 3 by a three-phase AC power from a commercial power source, so that the molten aluminum alloy is supplied to the mold 2 and the hot top 3. By using the electromagnetic stirring coil 5 that performs electromagnetic stirring in the circumferential direction, the power supply circuit and the control mechanism of the power regulator 6 become simple. It can be manufactured stably.

In the electromagnetic stirring coil shown in FIGS. 9 to 13, the coil element C is delta-connected to the three-phase AC power source. However, the rotating magnetic field generated when the coil element C is energized with the three-phase AC power is shown. As long as the magnetic pole has two poles in the entire electromagnetic stirring coil, the connection relationship between the coil element and the three-phase AC power supply is not limited to delta connection, and may be, for example, star connection.
Next, examples and comparative examples of the present invention will be described.

(Example)
A hypoeutectic Al—Si alloy having the chemical composition shown in Table 2 was used as the material for the aluminum alloy casting rod, and 10 A obtained by adjusting the commercial power supply to the coil element C of the electromagnetic stirring coil 5 with the power regulator 6. A rotating magnetic field having a magnetic flux density of 13 mT is generated on the inner diameter side of the mold 2 and the hot top 3 by energizing the three-phase AC current, and the aluminum alloy melt is bar-shaped while electromagnetically stirring the mold 2 and the hot top 3 in the circumferential direction. To obtain a cylindrical aluminum alloy casting rod having an outer diameter of 75 mm. And the metal structure of the obtained aluminum alloy casting rod was observed and photographed with an optical microscope.

The mold 2 used had an outer diameter of 160 mm, an inner diameter of 75 mm, and a height of 45 mm, and the hot top 3 used an outer diameter of 160 mm, an inner diameter of 60 mm, and a height of 225 mm. The electromagnetic stirring coil 5 has an iron core outer diameter of 260 mm, an iron core inner diameter of 165 mm, an iron core height of 50 mm, a slot number of 48, a copper wire diameter of 0.9 mm, a copper wire winding number of 45, and a coil element current density of 4.5 MA / m ^2. The thing of was used.

(Comparative example)
The same aluminum alloy casting rod material, mold and hot top as those used in the above-described embodiment were used, and a cast aluminum alloy rod having a 75 mm outer diameter was cast by casting an aluminum alloy melt into a rod shape without electromagnetic stirring. Got. And the metal structure of the obtained aluminum alloy casting rod was observed and photographed with an optical microscope.

Fig. 14 (a) shows a metal structure photograph of the aluminum alloy cast bar obtained in the example, and Fig. 14 (b) shows a metal structure photograph of the aluminum alloy cast bar obtained in the comparative example. As shown in FIG. 14, the aluminum alloy cast bar obtained in the example was obtained in the comparative example, whereas the metal structure was composed of primary crystal Al and eutectic structure having a fine and uniform granular structure. It can be seen that the aluminum alloy casting rod has a dendritic primary Al and eutectic structure.

The inventors of the present invention obtained the metal structure of the aluminum alloy casting rod obtained in the example by 0.5 mm × 0.5 mm centering on three positions indicated by “a”, “b”, and “c” in FIG. SEM-EBSD is used to analyze the boundary of a small tilt angle of less than 15 ° as a sub-grain boundary within the crystal grain, while the region surrounded by the tilt boundary of 15 ° or more is defined as one crystal grain. It was measured by the equivalent circle diameter of the crystal grains. As a result of calculating the average grain size and standard deviation of the crystal grains, it was confirmed that the average grain size of primary crystal Al of the aluminum alloy cast rod obtained in the example was 90 μm and the standard deviation was 25 μm. FIG. 15 shows a cross section of a cylindrical aluminum alloy cast bar. In the cross section, “c” is the center of the aluminum alloy cast bar, and “a” is 5 mm from the surface of the aluminum alloy cast bar. Yes, “b” is an intermediate point between “a” and “c”.

In addition, the inventors cut the aluminum alloy casting rods obtained in Examples and Comparative Examples to a length of 35 mm, and then heated to a temperature at which the aluminum alloy casting rods are in a semi-molten state in an electric furnace. Then, it was taken out from the electric furnace. A semi-molten aluminum alloy cast rod is pressed in the axial direction at a speed of 16 mm / min with a plunger, and the maximum pressure applied to the plunger when the diameter of the aluminum alloy cast rod reaches 80 mm is measured. did. And this was performed about the seven aluminum alloy cast bars, and the average value and standard deviation of the maximum pressurizing force were calculated. The results are shown in Table 3.

As apparent from the calculation results of the average value and the standard deviation of the maximum pressure shown in Table 3, the aluminum alloy cast bars obtained in the examples have an average value of the maximum pressure of 619.1 kN and a standard deviation of 6.2 kN. On the other hand, the aluminum alloy cast bar obtained in the comparative example is found to have an average maximum pressure of 1222.1 kN and a standard deviation of 406.4 kN. Therefore, it can be seen that the aluminum alloy cast bar obtained in the example is more suitable for the semi-melt forming process than the aluminum alloy cast bar obtained in the comparative example.

DESCRIPTION OF SYMBOLS 1 ... Continuous casting apparatus 2 ... Mold 3 ... Hot top 4 ... Molten supply tank 5 ... Electromagnetic stirring coil 51 ... Iron core S ... Slot C ... Coil element 6 ... Power regulator T1 ... U-phase terminal of a three-phase alternating current power supply T2 ... Three Phase AC power supply V-phase terminal T3: Three-phase AC power supply W-phase terminal

Claims (35)

1. A method for producing an aluminum alloy casting rod for semi-molten forming by continuously casting a molten aluminum alloy,
   As a continuous casting apparatus for continuously casting the molten aluminum alloy, a cylindrical mold that casts the molten aluminum alloy into a rod shape, and the mold is arranged on the mold so that the center coincides with the mold. A cylindrical hot top to be supplied to the mold; and an electromagnetic stirring coil for electromagnetically stirring the molten aluminum alloy inside the mold and the hot top; and the electromagnetic stirring coil supplies the molten aluminum alloy to the mold. While using a continuous casting apparatus having a plurality of coil elements that electromagnetically induce in the circumferential direction of the hot top, and an iron core that holds the coil elements on the outer periphery of the mold and the hot top,
   As a material of the aluminum alloy casting rod, a silicon alloy containing 3.0 to 10.0% by mass of Si, the balance being Al, 1.0% by mass or less of Fe, trace additives and inevitable impurities. Crystal Al-Si alloy,
   And as the electromagnetic stirring coil, the magnetic pole of the rotating magnetic field generated when the three-phase AC power is supplied to the coil element is a two-pole electromagnetic stirring coil in the entire electromagnetic stirring coil,
   A method for producing an aluminum alloy casting rod, comprising producing the aluminum alloy casting rod.
2. The material of the aluminum alloy casting rod contains 5.0 to 7.5% by mass of Si, the balance being Al, 0.50% by mass or less of Fe, and a trace additive of 0.70% by mass or less. Hypoeutectic Al-Si system comprising Mg, 0.50 mass% or less Mn, 0.50 mass% or less Cu, 0.20 mass% or less Ti, 0.07 mass% Be, and inevitable impurities The method of manufacturing an aluminum alloy cast bar according to claim 1, wherein the aluminum alloy cast bar is manufactured using an alloy.
3. As a material of the aluminum alloy casting rod, 6.5 to 7.5% by mass of Si, with the balance being Al, 0.20% by mass or less of Fe, 0.20 to 0.45% by mass of Mg, A hypoeutectic Al-Si alloy comprising 0.20 mass% or less of Cu, 0.10 mass% or less of Zn, 0.10 mass% or less of Mn, 0.02 mass% or less of Ti, and inevitable impurities. The method for producing an aluminum alloy cast bar according to claim 2, wherein the aluminum alloy cast bar is produced by using the aluminum alloy cast bar.
4. As a material of the aluminum alloy casting rod, 6.5 to 7.5% by mass of Si, the balance being Al, 0.20% by mass or less of Fe, 0.40 to 0.70% by mass of Mg, Cu of 0.20 mass% or less, Zn of 0.10 mass% or less, Mn of 0.10 mass% or less, Ti of 0.04 to 0.20 mass% or less, 0.04 to 0.07 mass% or less 3. The method for producing an aluminum alloy cast rod according to claim 2, wherein the aluminum alloy cast rod is produced using a hypoeutectic Al-Si alloy comprising Be and unavoidable impurities.
5. The method for producing an aluminum alloy casting rod according to any one of claims 1 to 4, wherein the current value of the three-phase AC power is set to 5A to 20A and the molten aluminum alloy is electromagnetically stirred.
6. 6. The method for producing an aluminum alloy cast bar according to claim 1, wherein the magnetic flux density of the rotating magnetic field is set to 7 mT to 28 mT and the molten aluminum alloy is electromagnetically stirred.
7. The primary aluminum crystal of the molten aluminum alloy continuously cast by the continuous casting apparatus is granular throughout the aluminum alloy casting rod, and the average grain size is 30 μm to 100 μm, and the standard deviation is 1/3 of the average grain size. The aluminum alloy casting rod according to any one of claims 1 to 6, wherein the aluminum alloy casting rod is manufactured while the aluminum alloy molten metal is electromagnetically stirred by the electromagnetic stirring coil so as to satisfy the following conditions. Manufacturing method.
8. The aluminum alloy cast rod according to any one of claims 1 to 7, wherein the aluminum alloy cast rod is manufactured by casting the aluminum alloy molten metal into a rod shape with a diameter of 70 mm to 120 mm using the mold. Production method.
9. Used when producing an aluminum alloy cast bar for semi-melt forming, containing 3.0 to 10.0% by mass of Si, the balance being Al, Fe of 1.0% by mass or less, and a small amount of addition A cylindrical mold that casts a hypoeutectic Al-Si alloy melt composed of a material and inevitable impurities into a rod shape, and is placed on the mold so that the center of the mold coincides with the mold, and the aluminum alloy melt is placed on the mold A cylindrical hot top to be supplied to the mold, and an electromagnetic stirring coil for electromagnetically stirring the Al—Si based alloy melt inside the mold and the hot top, and the Al—Si based alloy melt as the mold and the above A continuous casting apparatus in which the electromagnetic stirring coil has a plurality of coil elements electromagnetically induced in a circumferential direction of the hot top, and an iron core that holds the coil elements on the outer periphery of the mold and the hot top,
   The continuous casting apparatus, wherein the magnetic stirring coil is a two-pole magnetic stirring coil in which the magnetic field of the rotating magnetic field generated when three-phase AC power is supplied to the coil element.
10. The iron core is formed in a cylindrical shape with an inner diameter larger than the outer diameter of the mold and the hot top, and is arranged on the outer periphery of the mold and the hot top so as to coincide with the center of the mold. The continuous casting apparatus according to claim 9.
11. The continuous casting apparatus according to claim 9 or 10, wherein the number of the coil elements is a multiple of six.
12. 12. The continuous casting apparatus according to claim 11, wherein the coil element has a plurality of slots formed at regular intervals on an inner peripheral surface of the iron core corresponding to the coil element.
13. The coil element is formed by winding a copper wire in a coil shape between two slots formed on the inner peripheral surface of the iron core with a 120 ° shift in the circumferential direction of the iron core among the plurality of slots. The continuous casting apparatus according to claim 12, wherein:
14. 14. The continuous casting apparatus according to claim 13, wherein the slot has a width of 6.0 mm to 12.0 mm and a depth of the slot of 15.0 mm to 35.0 mm.
15. The continuous casting apparatus according to claim 14, wherein a surface of the copper wire is covered with an insulating coating.
16. The continuous casting apparatus according to claim 15, wherein a wire diameter of the copper wire is 0.6 mm to 1.7 mm, and a winding number of the copper wire is 33 to 67.
17. The height of the mold is 30 mm to 60 mm, the height of the hot top is 100 mm to 300 mm, and the height of the iron core is 20 mm to 50 mm. Continuous casting equipment.
18. The continuous casting apparatus according to claim 17, wherein the iron core is formed by laminating a plurality of electromagnetic steel sheets having a thickness of 0.3 mm to 0.7 mm.
19. 19. The continuous casting apparatus according to claim 18, wherein the iron core has an inner diameter larger than the outer diameter of the mold and the hot top within a range of 10 mm to 30 mm and an outer diameter larger than the inner diameter by 50 mm or more. .
20. The number of the coil elements is 36. Among the 36 coil elements, the first to sixth, seventh to twelfth, thirteenth to eighteenth, nineteenth to twenty-fourth, twenty-fifth to thirtieth, The thirty-first to thirty-sixth coil elements are connected in series, and the first, eighteenth, twenty-fourth, and thirty-first coil elements are connected to the U-phase terminal of the three-phase AC power source, and the sixth, twelfth, nineteenth, twenty-fifth. The coil element is connected to the V-phase terminal of the three-phase AC power supply, and the seventh, thirteenth, thirty-th, and thirty-sixth coil elements are connected to the W-phase terminal of the three-phase AC power supply. The continuous casting apparatus described in 1.
21. The number of the coil elements is 42, and the first to seventh, eighth to fourteenth, fifteenth to twenty-first, twenty-second to twenty-eighth, twenty-ninth to thirty-fifth of the 42 coil elements. The 36th to 42nd coil elements are connected in series, and the 1st, 21st, 28th, and 36th coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, and the 7th, 14th, 22nd, and 2nd coil elements. The 29th coil element is connected to the V-phase power supply terminal of the three-phase AC power supply, and the 8th, 15th, 35th and 42nd coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. The continuous casting apparatus according to claim 19.
22. The number of the coil elements is 48. Of the 48 coil elements, the first to eighth, ninth to sixteenth, seventeenth to twenty-fourth, twenty-fifth to thirty-second, thirty-third to forty, The 41st to 48th coil elements are connected in series, and the first, 24th, 32nd and 41st coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, and the eighth, sixteenth, twenty-fifth, The coil element 33 is connected to a V-phase power supply terminal of a three-phase AC power supply, and the ninth, seventeenth, fortieth and forty-eighth coil elements are connected to a W-phase power supply terminal of the three-phase AC power supply. The continuous casting apparatus according to claim 19.
23. The number of coil elements is 54. Of the 54 coil elements, the first to ninth, tenth to eighteenth, nineteenth to twenty-seventh, twenty-eighth to thirty-sixth, thirty-seventh to forty-fifth, The 46th to 54th coil elements are connected in series, and the first, 27th, 36th and 46th coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, and the ninth, 18th, 28th and 28th coils. The coil element 37 is connected to the V-phase power supply terminal of the three-phase AC power supply, and the tenth, nineteenth, 45th and 54th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. The continuous casting apparatus according to claim 19.
24. The number of the coil elements is 60. Among the 60 coil elements, the first to the tenth, the eleventh to the twentieth, the twenty-first to the thirty-first, the thirty-first to the forty-th, the forty-first to the fifty-th, The 51st to 60th coil elements are connected in series, and the 1st, 30th, 40th, and 51st coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, the 10th, 20th, 31st, and The coil element 41 is connected to the V-phase power supply terminal of the three-phase AC power supply, and the eleventh, twenty-first, fifty-th and 60th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. The continuous casting apparatus according to claim 19.
25. A continuous mold comprising a cylindrical mold for casting a molten aluminum alloy into a rod shape, and a cylindrical hot top that is arranged on the mold so that the center of the mold coincides with the mold and supplies the molten aluminum alloy to the mold A plurality of coil elements that are used in a casting apparatus and electromagnetically induce the molten aluminum alloy in a circumferential direction of the mold and the hot top, and an iron core that holds the coil elements on the outer periphery of the mold and the hot top. An electromagnetic stirring coil for a continuous casting device,
    An electromagnetic stirring coil for a continuous casting apparatus, wherein the magnetic pole of a rotating magnetic field generated when three-phase AC power is supplied to the coil element is two poles as a whole.
26. 26. The electromagnetic stirring coil for a continuous casting apparatus according to claim 25, wherein the number of coil elements is a multiple of six.
27. 27. The electromagnetic stirring coil for a continuous casting apparatus according to claim 26, wherein the iron core has a plurality of slots formed at regular intervals on an inner peripheral surface of the iron core corresponding to the coil element.
28. The coil element is formed by winding a copper wire in a coil shape between two slots formed on the inner peripheral surface of the iron core, shifted by 120 degrees in the circumferential direction of the iron core among the plurality of slots. 28. The electromagnetic stirring coil for a continuous casting apparatus according to claim 27, wherein:
29. The electromagnetic stirring coil for a continuous casting apparatus according to claim 28, wherein a surface of the copper wire is covered with an insulating coating.
30. 30. The electromagnetic stirring coil for a continuous casting apparatus according to claim 29, wherein a wire diameter of the copper wire is 0.6 mm to 1.7 mm and a winding number of the copper wire is 33 to 67.
31. The number of the coil elements is 36. Among the 36 coil elements, the first to sixth, seventh to twelfth, thirteenth to eighteenth, nineteenth to twenty-fourth, twenty-fifth to thirtieth, The thirty-first to thirty-sixth coil elements are connected in series, and the first, eighteenth, twenty-fourth, and thirty-first coil elements are connected to the U-phase terminal of the three-phase AC power source, and the sixth, twelfth, nineteenth, twenty-fifth. The coil element is connected to a V-phase terminal of a three-phase AC power supply, and the seventh, thirteenth, thirty-th, and thirty-sixth coil elements are connected to a W-phase terminal of the three-phase AC power supply. An electromagnetic stirring coil for a continuous casting apparatus as described in 1.
32. The number of the coil elements is 42, and the first to seventh, eighth to fourteenth, fifteenth to twenty-first, twenty-second to twenty-eighth, twenty-ninth to thirty-fifth of the 42 coil elements. The 36th to 42nd coil elements are connected in series, and the 1st, 21st, 28th, and 36th coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, and the 7th, 14th, 22nd, and 2nd coil elements. The 29th coil element is connected to the V-phase power supply terminal of the three-phase AC power supply, and the 8th, 15th, 35th and 42nd coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. The electromagnetic stirring coil for continuous casting apparatuses of Claim 30.
33. The number of the coil elements is 48. Of the 48 coil elements, the first to eighth, ninth to sixteenth, seventeenth to twenty-fourth, twenty-fifth to thirty-second, thirty-third to forty, The 41st to 48th coil elements are connected in series, and the first, 24th, 32nd and 41st coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, and the eighth, sixteenth, twenty-fifth, The coil element 33 is connected to a V-phase power supply terminal of a three-phase AC power supply, and the ninth, seventeenth, fortieth and forty-eighth coil elements are connected to a W-phase power supply terminal of the three-phase AC power supply. The electromagnetic stirring coil for continuous casting apparatuses of Claim 30.
34. The number of coil elements is 54. Of the 54 coil elements, the first to ninth, tenth to eighteenth, nineteenth to twenty-seventh, twenty-eighth to thirty-sixth, thirty-seventh to forty-fifth, The 46th to 54th coil elements are connected in series, and the first, 27th, 36th and 46th coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, and the ninth, 18th, 28th and 28th coils. The coil element 37 is connected to the V-phase power supply terminal of the three-phase AC power supply, and the tenth, nineteenth, 45th and 54th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. The electromagnetic stirring coil for continuous casting apparatuses of Claim 30.
35. The number of the coil elements is 60. Among the 60 coil elements, the first to the tenth, the eleventh to the twentieth, the twenty-first to the thirty-first, the thirty-first to the forty-th, the forty-first to the fifty-th, The 51st to 60th coil elements are connected in series, and the 1st, 30th, 40th, and 51st coil elements are connected to the U-phase power supply terminal of the three-phase AC power supply, the 10th, 20th, 31st, and The coil element 41 is connected to the V-phase power supply terminal of the three-phase AC power supply, and the eleventh, twenty-first, fifty-th and 60th coil elements are connected to the W-phase power supply terminal of the three-phase AC power supply. The electromagnetic stirring coil for continuous casting apparatuses of Claim 30.

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