KR20210043920A - Small diameter rod-typed aluminum alloy casting material and method of manufacturing the same - Google Patents

Abstract

The present invention provides a method of manufacturing a small-diameter rod aluminum alloy cast material capable of forming a small-diameter rod casting material by minimizing a decrease in fluidity by applying a fast casting speed. According to an embodiment of the present invention, the method comprises: a step of injecting aluminum alloy molten metal to the top of a stationary movable table through a through-type mold; a maintaining step of maintaining the movable table in a stationary state for a predetermined period of time; and a casting step of lowering the movable table and casting at a preset casting speed. After the maintaining step is completed, a step of directly increasing the set casting speed without a transition section for gradually increasing the descending speed of the movable table may be included.

Description

Small diameter rod-typed aluminum alloy casting material and method of manufacturing the same}

The technical idea of the present invention relates to a method of manufacturing an aluminum alloy cast material, and more particularly, to a small-diameter aluminum alloy cast material and a method of manufacturing the same.

BACKGROUND ART In recent years, due to the reduction of fuel economy of automobiles and the development of electric vehicles, there is an increasing demand for weight reduction of vehicles. Accordingly, the amount of use of vehicle parts using lightweight metals such as aluminum is rapidly increasing. Especially. Aluminum alloys are increasingly widely used in bumpers, door impact bars, seat rails, and the like, and the aluminum alloy is required to have high strength. In order to manufacture such a high-strength aluminum alloy, it is necessary to form an extruded material or a forging material, and a technology for manufacturing an aluminum alloy cast material in the form of a billet is required as a basic material for this.

As a method for manufacturing such an aluminum billet, continuous casting is known. Continuous casting is a method of forming a cast material having a long length without being limited to the height of the mold by using a through-type mold, and generally, the injected molten metal is cooled by a mold. Direct chill casting (DC casting) is a type of continuous casting and is a method of cooling by directly providing a cooling fluid to a casting material that has passed through a through-type mold. The cast material formed by such direct cooling casting has excellent advantages in formability, microstructure, grain size distribution, and glossiness.

However, when the conventional direct cooling casting method is used, there is a problem in that it is difficult to manufacture a small diameter rod having a small diameter due to a decrease in fluidity due to a fast cooling rate. In particular, in the case of the 7000 series aluminum alloy, which is a high-alloy aluminum alloy used as an ultra-high strength material, it was difficult to form a small-diameter cast material having a diameter of 100 mm or less using a conventional direct cooling casting method. In the case of conventional direct cooling casting, molten metal is injected into the through-type mold and maintained without casting for a certain period of time. After casting at a low speed initially, the casting speed is gradually increased to reach the final casting speed, and then cast at a constant casting speed. It proceeds to steps. In the case of 7000 series aluminum alloy, the solid-liquid coexistence area is wide, so the semi-solid state is maintained at the sidewall that is cooled first among the molten metal inlets at the initial stage of direct casting, and this semi-solid state is maintained at the initial stage of casting. Can be extended to the center of In particular, in the case of casting a small diameter rod having a small diameter, it is easy to expand the semi-solid state from the side wall of the injection port to the center of the injection port. Accordingly, in the holding section after the molten metal injection in the initial casting period and in the casting start section of the initial low speed, the semi-solid state of the molten metal from the side wall of the injection port to the center of the injection port is expanded, so that solidification may occur at the center of the injection port. As the injection hole was blocked by such solidification and thus casting became impossible, casting of a small-diameter aluminum alloy cast material having a diameter of 100 mm or less was very difficult.

Korean Patent Publication No. 10-2010-0020729

The technical problem to be achieved by the technical idea of the present invention is a new direct cooling casting method capable of stably manufacturing all small-diameter bars of aluminum alloys of various compositions, including high-alloy-based aluminum alloys, and the small-diameter casting materials manufactured by this method. It is for the purpose of providing. However, these problems are exemplary, and the technical idea of the present invention is not limited thereto.

According to one aspect of the present invention, there is provided a method of manufacturing an aluminum alloy small-diameter cast material by a direct cooling casting method of a hot top method.

According to an embodiment of the present invention, the method includes the steps of: injecting molten aluminum alloy into the upper part of a stationary movable table through a through-type mold; A maintenance step of maintaining the movable table in a stopped state for a predetermined time; And a casting step of lowering the movable table to cast at a preset casting speed, and after the holding step is finished, immediately at the set casting speed without a transition section for gradually increasing the descending speed of the movable table. It may include the step of increasing.

According to an embodiment of the present invention, the method includes the steps of injecting molten aluminum alloy through a through-type mold and then moving the movable table at a first casting speed without holding time; And casting the movable table by transitioning to a second casting speed higher than the first casting speed; and, in the process of transitioning from the first casting speed to the second casting speed, a lowering speed of the movable table is adjusted. It may include the step of increasing directly from the first casting speed to the second casting speed without a transition section gradually increasing.

In one embodiment of the present invention, the set casting speed may have a range of 200 mm/min to 300 mm/min.

In one embodiment of the present invention, the set casting speed may be implemented using a servo motor.

In one embodiment of the present invention, the first casting speed may have a range of 50 mm/min to 180 mm/min.

In one embodiment of the present invention, the second casting speed may have a range of 200 mm/min to 300 mm/min.

In one embodiment of the present invention, the first casting speed and the second casting speed may be implemented using a servo motor.

In one embodiment of the present invention, the small-diameter aluminum alloy casting material may include a 7000 series aluminum alloy.

In one embodiment of the present invention, the small-diameter aluminum alloy cast material may have a diameter of 100 mm or less.

In one embodiment of the present invention, the small-diameter aluminum alloy cast material may have a secondary dendritic distance in the range of 15 μm to 30 μm.

In one embodiment of the present invention, the small-diameter aluminum alloy cast material may have a grain size in the range of 50 μm to 100 μm.

According to another aspect of the present invention, there is provided a small-diameter rod cast material having a diameter of 100 mm or less made of a 7000 series aluminum alloy.

In one embodiment of the present invention, the small-diameter cast material may have a secondary dendritic distance in the range of 15 μm to 30 μm, and a grain size in the range of 50 μm to 100 μm.

According to the technical idea of the present invention, it is possible to manufacture small-diameter rods of aluminum alloy having various compositions, and in particular, high-alloy aluminum alloy small-diameter rods having a diameter of 100 mm or less, which were difficult to manufacture by conventional methods, can be easily and stably Can be manufactured. It can be seen that there is little change in microstructure even when moving from the center of the small-diameter aluminum alloy cast material to the surface part, and thus has a uniform microstructure. A small-diameter aluminum alloy cast material having such a fine and uniform microstructure can provide high strength.

The above-described effects of the present invention have been described by way of example, and the scope of the present invention is not limited by these effects.

1 is a schematic diagram showing a direct cooling casting apparatus for manufacturing a small-diameter aluminum alloy cast material according to an embodiment of the present invention.
2 is a flowchart showing a method of manufacturing a small-diameter aluminum alloy cast material according to the first embodiment of the present invention.
3 is a graph showing a casting speed over time in a method of manufacturing a small-diameter aluminum alloy cast material according to the first embodiment of the present invention.
4 is a flowchart showing a method of manufacturing a small-diameter aluminum alloy cast material according to a second embodiment of the present invention.
5 is a graph showing a casting speed over time in a method of manufacturing a small-diameter aluminum alloy cast material according to a second embodiment of the present invention.
6 is a photograph of a small-diameter aluminum alloy cast material formed using a method of manufacturing a small-diameter aluminum alloy cast material according to an embodiment of the present invention.
7 is a graph showing a change in the secondary dendritic distance from the center to the surface of the small-diameter aluminum alloy cast material formed by using the method of manufacturing a small-diameter aluminum alloy cast material according to an embodiment of the present invention.
8 is a graph showing the change in grain size from the center to the surface of the small-diameter aluminum alloy cast material formed by using the method of manufacturing a small-diameter aluminum alloy cast material according to an embodiment of the present invention.
9 are results showing the microstructure from the center to the surface of the small-diameter aluminum alloy cast material formed by using the method of manufacturing a small-diameter aluminum alloy cast material according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention are provided to more completely explain the technical idea of the present invention to those of ordinary skill in the art, and the following examples may be modified in various other forms, and The scope of the technical idea is not limited to the following examples. Rather, these embodiments are provided to make the present disclosure more faithful and complete, and to completely convey the technical idea of the present invention to those skilled in the art. In the present specification, the same reference numerals refer to the same elements. Furthermore, various elements and areas in the drawings are schematically drawn. Accordingly, the technical idea of the present invention is not limited by the relative size or spacing drawn in the accompanying drawings.

1 is a schematic diagram showing a direct cooling casting apparatus for manufacturing a small-diameter aluminum alloy cast material according to an embodiment of the present invention.

Referring to FIG. 1, the direct cooling casting apparatus 100 is a hot top method and includes a tundish 10, a through-type mold 20, and a movable table 30. In addition, a refractory cover 40 made of a refractory material is installed on the top of the through-type mold 20. A through hole 40a through which the molten metal can pass is formed in the central portion of the refractory cover 40.

The tundish 10 is a storage device into which the aluminum alloy molten metal 1 can be poured, and the aluminum alloy molten metal 1 is stored at an appropriate flow rate through a through hole 40a formed in the refractory cover 40 through a through-type mold ( 20). As the refractory cover 40 is formed on the top of the through-type mold 20, the flow of the molten metal can be stabilized, and the molten metal can prevent oxidation and reduce heat loss.

In the through-type mold 20, when the aluminum alloy molten metal 1 is provided from the tundish 10, the aluminum alloy molten metal 2 is solidified into an aluminum alloy solid phase 4 to form a small-diameter aluminum alloy cast material. A graphite chill 20a for cooling is formed on a part of the inner surface of the through-type mold 20. In addition, a discharge part 20b for discharging a gas or liquid for directly cooling the molten aluminum alloy 2 injected into the through-type mold 20 is formed. The through-type mold 20 may have a circular shape or may have a polygonal shape.

Between the aluminum alloy molten metal 2 and the aluminum alloy solid phase 4, there is a solid-liquid coexistence zone 3 (Mushy Zone) in which the aluminum alloy molten metal 2 and the aluminum alloy solid phase 4 coexist.

The movable table 30 is provided under the through-type mold 20 and is a pedestal on which the solidified aluminum alloy 4 is placed while passing through the through-type mold 20. For continuous casting of the aluminum alloy solid phase 4, it is moved downward by a motor linked to the movable table 30. That is, the movable table 30 forms a small-diameter aluminum alloy cast material by continuously pulling the solidified aluminum alloy 4 from the through-type mold 20 downward. The moving speed of the movable table 30 is interlocked with the casting speed, and therefore, the casting speed in the present specification is a part or all of the molten aluminum alloy that has passed through the through-type mold is solidified and seated on the movable table, It means the speed to move in the downward direction.

In the direct cooling casting apparatus 100 according to an embodiment of the present invention, an aluminum alloy molten metal or an aluminum alloy solid phase partially solidified by a cooling fluid while passing through the through-type mold 20 is seated on the movable table 30. After holding for a predetermined time, the movable table 30 is lowered at a high speed in order to cast at a preset casting speed.

As another example of the present invention, after the aluminum alloy molten metal is seated on the movable table 30, the first casting speed is moved for a predetermined time without holding time, and then the second casting speed is higher than the first casting speed. It is cast by rapidly descending at the casting speed.

Therefore, the movable table 30 must undergo a rapid change in moving speed, and a servo motor may be used as a motor interlocked for this.

Conventionally, a conventional stepper motor has been used as a motor for operating the movable table. However, such a step motor has a problem that it is difficult to control so as to respond to a sudden change in speed of the moving table. In contrast, in the case of a servomotor, it is possible to quickly respond to an external electrical signal for rapid movement of the movable table, and thus, by using a servo motor, it is possible to stably perform a change in the rapid movement speed of the movable table to be described later. I can.

2 is a flow chart showing a method (S100) of manufacturing a small-diameter aluminum alloy cast material according to the first embodiment of the present invention.

Referring to Figure 2, the method for manufacturing a small-diameter aluminum alloy cast material according to the first embodiment (S100) is a method of manufacturing an aluminum alloy small-diameter cast material by a direct cooling casting method of a hot top method, Injecting the molten aluminum alloy into the upper part of the movable table through a mold (S110), the maintenance step of maintaining the movable table in a stationary state for a certain period of time (S120), and the molten aluminum alloy at a preset casting speed. It includes a step (S130) of casting after increasing the casting speed without a transition section.

The manufacturing method (S100) according to the technical idea of the present invention is a speed transition for gradually gradually increasing the casting speed (that is, the lowering speed of the movable table) for a predetermined time in the process of increasing the speed from the state where the movable table is stopped to the set casting speed. It is characterized in that the section is not performed.

3 is a graph showing a casting speed over time in a method of manufacturing a small-diameter aluminum alloy cast material according to the first embodiment of the present invention. 3(a) shows the change of the casting speed over time during the conventional direct cooling casting as a comparative example, and (b) shows the change of the casting speed over time according to the first embodiment of the present invention.

Referring to Figure 3 (a), in the conventional direct cooling casting, after the solidified aluminum alloy solid phase is settled on the moving table and then maintained without casting for a certain period of time (corresponding to the holding section), initially casting at low speed. After that (corresponding to the starting section), the casting speed is gradually increased (corresponding to the transition section), and finally cast at a constant casting speed of about 80 mm/min to 120 mm/min (corresponding to the stable section).

On the other hand, referring to (b) of FIG. 3, in the case of an embodiment of the present invention, an aluminum alloy molten metal is injected into a through-type mold, and after the injected molten metal is solidified, it is seated on a movable table and then maintained (maintaining Corresponds to the section), and then cast at a preset casting speed (Vs in Fig. 3) (corresponds to the casting section) to form a small-diameter aluminum alloy cast material.

The set casting speed is in the range of 200 mm/min to 300 mm/min, which is faster than the conventional casting speed of about 100 mm/min, preferably 220 mm/min to 280 mm/min, more preferably May have a range of 230 mm/min to 270 mm/min.

As shown in (b) of FIG. 3, according to an embodiment of the present invention, the casting speed rapidly increases to a preset casting speed without a transition section, which is a gradual speed change section after the maintenance section. As described above, the movable table is driven by a servo motor in order to stably implement a fast transition to the set casting speed.

4 is a flowchart illustrating a method (S200) of manufacturing a small-diameter aluminum alloy cast material according to a second embodiment of the present invention.

Referring to FIG. 4, a method of manufacturing a small-diameter aluminum alloy cast material according to the second embodiment (S200) is a method of manufacturing an aluminum alloy small-diameter cast material by a direct cooling casting method of a hot top method. Injecting the molten aluminum alloy into a mold (S200), casting the molten aluminum alloy at a first casting speed without a holding time (S220), and casting the molten aluminum alloy into the first casting rate. 2 It includes a step of casting after transitioning to the casting speed (S230). At this time, in the process of transitioning from the first casting speed to the second casting speed, a transition section for gradually accelerating the casting speed for a predetermined time is not performed, and the first casting speed is immediately rapidly increased from the first casting speed to the second casting speed. do.

5 is a graph showing a casting speed over time in the method of manufacturing a small-diameter aluminum alloy cast material according to the second embodiment.

5, in the case of the second embodiment of the present invention, molten aluminum alloy is injected into the through-type mold, and at the same time, the first direct cooling casting is performed at the first casting speed (corresponding to the first casting section), and then the above Second direct cooling casting (corresponding to the second casting section) at a second casting rate higher than the first casting rate to form a small-diameter aluminum alloy cast material.

At this time, the first casting speed may have a range of 50 mm/min to 180 mm/min, preferably 70 mm/min to 150 mm/min, more preferably 80 mm/min to 120 mm/min. In addition, the second casting speed has a range of 200 mm/min to 300 mm/min, preferably 220 mm/min to 280 mm/min, more preferably 230 mm/min to 270 mm/min. I can.

As shown in Fig. 5, according to an embodiment of the present invention, the casting speed is rapidly increased to the second casting speed immediately after the first casting speed without the transition section shown in Fig. 3(a). do. That is, unlike the conventional method, a transition section in which the casting speed gradually increases during the transition from the first casting speed to the second casting speed is not performed. In order to stably implement a fast transition from the first casting speed to the second casting speed, the movable table is driven by a servo motor.

The small-diameter aluminum alloy cast material manufactured according to the technical idea of the present invention may include aluminum alloys of various compositions (the aluminum alloy in the present specification includes not only aluminum including alloy elements but also pure aluminum comprehensively). For example, it may be a cast material alloy or a wrought material alloy known from the prior art. In particular, in the case of a high alloy-based wrought material alloy, for example, a 6000 series or 7000 series alloy, a small diameter rod having a diameter of 100 mm or less can be easily and stably manufactured according to an embodiment of the present invention.

As described above, the 7000 series aluminum alloy, which is a representative high-alloy aluminum alloy, is due to lack of fluidity near the injection port of the through-type mold during the process of performing the holding section or the acceleration section when casting a small diameter rod of 100 mm or less in a conventional method. As a result, coagulation occurred and the injection hole was clogged, which made it difficult to manufacture a small diameter rod.

On the other hand, according to an embodiment of the present invention, when the molten metal is injected into the through-type mold and the solidified aluminum solidified while passing through the through-type mold is settled on the movable table, a fixed movable table is cast without a holding section and a starting section. Immediately increasing the speed or moving the movable table at the first casting speed for a predetermined period of time to perform casting, and then quickly transitioning to the second casting speed without a transition section. During this process, the semi-solid state of the molten metal can be minimized, and the fluidity of the molten metal can be secured. Therefore, casting of a small-diameter rod can be stably performed by minimizing the possibility that the aluminum alloy in a semi-solid state is solidified near the injection hole while the movable table is stopped or moved at a low speed.

The small-diameter aluminum alloy cast material manufactured according to an embodiment of the present invention may have a diameter of 100 mm or less, for example, 20 mm to 100 mm, or in a range of 50 mm to 100 mm. When the small-diameter cast material is a 7000-based aluminum alloy, the cast material may have a secondary dendrite arm spacing (SDAS) in the range of 15 μm to 30 μm, and may have a grain size in the range of 50 μm to 100 μm. .

Hereinafter, an experimental example for aiding understanding of the present invention will be described. The following experimental examples are presented to aid understanding of the invention, and are not limited to the following experimental examples of the present invention.

A7068 alloy was selected as the aluminum alloy for the small-diameter aluminum alloy cast material, and the composition is shown in Table 1.

Al Zn Mg Cu Fe Zr Si Ti Cr Mn Bal 7.46 2.40 1.92 0.12 0.10 0.027 0.026 0.009 0.003

The direct casting cooling apparatus of the hot top method shown in FIG. 1 was used. The first casting speed was 100 mm/min, and the second casting speed was 240 mm/min. The diameters of the small-diameter aluminum alloy cast material of the experimental example were 50 mm, 70 mm, and 100 mm. As a comparative example, a cast material cast in the same manner as in FIG. 3 (a) was manufactured. The holding section was maintained for 23 seconds, the casting speed in the starting section was 90 mm/min, and the casting speed in the stable section was 115 mm/min. In these casting conditions, the production of small-diameter rods having a diameter of 100 mm or less could not be manufactured due to the problem of clogging the injection port, and thus, a small-diameter rod having a diameter of 150 mm of the cast material was manufactured as a comparative example.

Figure 6 (a) is a result of observing a small-diameter aluminum alloy cast material manufactured using the method of manufacturing a small-diameter aluminum alloy cast material according to the experimental example, Figure 6 (b) is a cross-sectional view of a small-diameter rod having a diameter of 50 mm It's a picture.

6A and 6B, small-diameter aluminum alloy cast materials having diameters of 50 mm, 70 mm, and 100 mm, respectively, were successfully formed by using the method of manufacturing the small-diameter aluminum alloy cast material. . This is referred to as Experimental Examples 1, 2 and 3, respectively. It can be seen that the small-diameter aluminum alloy cast materials have excellent surface quality and no internal cracks.

7 is a graph showing a change in the secondary dendritic distance from the center to the surface of the small-diameter aluminum alloy cast material according to the experimental example.

Referring to FIG. 7, in the case of a comparative example of 150 mm diameter, the secondary dendrite arm spacing (SDAS) sharply decreased from about 46 μm to about 33 μm from the center of the cast material to the surface. On the other hand, the experimental examples showed a smaller secondary dendritic distance compared to the comparative examples, and the degree of change was also small. Specifically, in the case of the 100 mm diameter in Experimental Example 3, the change in the secondary dendritic distance was relatively small from about 25 μm in the center to about 23 μm in the surface area. In addition, in the case of the 70 mm diameter in Experimental Example 2, the secondary dendritic distance was almost the same in the center and the surface portion, and there was almost no change to about 23 μm. In the case of the 50 mm diameter in Experimental Example 3, the secondary dendritic distance was the smallest value, and there was almost no change to about 18 μm in the center portion and the surface portion.

8 is a graph showing the change in grain size from the center to the surface of the small-diameter aluminum alloy cast material according to the experimental example.

Referring to FIG. 8, in the case of a comparative example of 150 mm diameter, the grain size decreased from about 115 μm to 90 μm from the center of the cast material toward the surface. In the experimental examples of the present invention, the grain size was smaller than that of the comparative example, and the degree of change was also small. Specifically, in the case of the 100 mm diameter in Experimental Example 3, the crystal grain size was about 90 μm in the center and about 60 μm in the surface part. In the case of the 70 mm diameter in Experimental Example 2, the crystal grain size was about 85 μm in the center and about 70 μm in the surface. In the case of the 50 mm diameter in Experimental Example 1, the crystal grain size was about 82 μm in the center and about 60 μm in the surface.

Referring to FIGS. 7 and 8, in the case of a small diameter rod having a diameter of 150 mm as a comparative example, the overall microstructure was coarse, and the difference in the size of the surface portion and the central microstructure was large. However, in the case of a small diameter rod having a diameter of 100 mm, a diameter of 70 mm, and a diameter of 50 mm manufactured according to the technical idea of the present invention, it can be seen that the deviation of the microstructure of the center portion and the surface portion is very small. Therefore, it can be expected that the small-diameter rod manufactured according to the experimental examples exhibits a high mechanical strength and a small uniform value of the strength deviation value for each location.

In general, the secondary dendritic distance is directly related to the cooling rate, and if the cooling rate is slow, the secondary dendritic distance becomes large. In the case of a small diameter rod having a diameter of 150 mm, which is a comparative example, since the secondary dendritic distance is large, the overall cooling rate including the surface portion is slow, and in particular, it can be seen that the cooling rate tends to decrease significantly toward the center. On the other hand, in the case of a small diameter rod having a diameter of 100 mm, a diameter of 70 mm, and a diameter of 50 mm, which is an experimental example of the present invention, since the secondary dendritic distance appears small, it can be seen that the overall cooling rate is fast and the variation for each part is insignificant.

9 is a result of observing the microstructure from the center portion to the surface portion of the aluminum alloy cast material of a small diameter 50 mm diameter according to Experimental Example 1 of the present invention.

Referring to FIG. 9, it can be seen that there is little change in microstructure even when moving from the center of the small-diameter aluminum alloy cast material to the surface, and thus it can be seen that it has a uniform microstructure. A small-diameter aluminum alloy cast material having such a fine and uniform microstructure can provide high strength.

The technical idea of the present invention described above is not limited to the above-described embodiments and the accompanying drawings, and that various substitutions, modifications and changes are possible within the scope not departing from the technical idea of the present invention, the technical idea of the present invention It will be apparent to those of ordinary skill in the art to which this belongs.

Claims (12)

As a method of manufacturing an aluminum alloy small-diameter cast material by a hot top method direct cooling casting method,
Injecting the molten aluminum alloy into the upper portion of the movable table through the through-type mold;
A maintenance step of maintaining the movable table in a stopped state for a predetermined period of time; And
A casting step of lowering the movable table and casting at a preset casting speed; including,
After the maintenance step is finished, including the step of immediately increasing the set casting speed without a transition section gradually increasing the descending speed of the movable table,
A method of manufacturing a small-diameter aluminum alloy cast material. As a method of manufacturing an aluminum alloy small-diameter cast material by a hot top method direct cooling casting method,
Injecting the molten aluminum alloy through the through-type mold and then moving the movable table at a first casting speed without a holding time; And
Transitioning the movable table to a second casting speed higher than the first casting speed and casting; Including,
In the process of transitioning from the first casting speed to the second casting speed, increasing the first casting speed to the second casting speed directly from the first casting speed without a transition section gradually increasing the descending speed of the movable table,
A method of manufacturing a small-diameter aluminum alloy cast material. The method of claim 1,
The set casting speed has a range of 200 mm / min to 300 mm / min,
A method of manufacturing a small-diameter aluminum alloy cast material. The method of claim 1,
The set casting speed is implemented using a servo motor,
A method of manufacturing a small-diameter aluminum alloy cast material. The method of claim 2,
The first casting speed has a range of 50 mm / min to 180 mm / min,
A method of manufacturing a small-diameter aluminum alloy cast material. The method of claim 2,
The second casting speed has a range of 200 mm / min to 300 mm / min,
A method of manufacturing a small-diameter aluminum alloy cast material. The method of claim 2,
The first casting speed and the second casting speed are implemented using a servo motor,
A method of manufacturing a small-diameter aluminum alloy cast material. The method according to claim 1 or 2,
The small-diameter aluminum alloy casting material comprises a 7000-based aluminum alloy,
A method of manufacturing a small-diameter aluminum alloy cast material. The method according to claim 1 or 2,
The small-diameter aluminum alloy cast material has a diameter of 100 mm or less,
A method of manufacturing a small-diameter aluminum alloy cast material. The method according to claim 1 or 2,
The small-diameter aluminum alloy cast material has a secondary dendritic distance in the range of 15 μm to 30 μm, a method of manufacturing a small-diameter aluminum alloy cast material. The method according to claim 1 or 2,
The small-diameter aluminum alloy cast material has a grain size in the range of 50 μm to 100 μm, a method of manufacturing a small-diameter aluminum alloy cast material. It is a small diameter rod casting material with a diameter of 100mm or less made of 7000 series aluminum alloy,
The small-diameter rod casting material has a secondary dendritic distance in the range of 15 μm to 30 μm, and has a grain size in the range of 50 μm to 100 μm,
Small diameter aluminum alloy casting material.

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