KR101309640B1 - A device for manufacturing magnesium sheet to prevent an acumulation of oxide - Google Patents

Abstract

Magnesium manufacturing apparatus for preventing the accumulation of oxide according to an embodiment of the present invention, the nozzle portion including a nozzle in which the magnesium is melted is coupled to the melting crucible, which is installed at a distance from the nozzle portion and injected from the nozzle portion An extrusion part including a pair of rollers from which magnesium molten metal is extruded, and a vibration part coupled to the nozzle part to generate vibrations in the nozzle part.

Description

Magnesium Sheet Manufacturing Equipment to Prevent Oxide Accumulation {A DEVICE FOR MANUFACTURING MAGNESIUM SHEET TO PREVENT AN ACUMULATION OF OXIDE}

The present invention relates to a magnesium sheet production apparatus, and more particularly, to an invention for preventing the accumulation of oxides in the magnesium sheet production apparatus by interfering with the growth of the oxide produced during magnesium plate production.

Magnesium (Mg) is included in low-density metals among commonly used structural alloying elements. Such magnesium-containing alloy material has excellent machinability, high vibration damping ability, excellent absorption against vibration and shock, light weight, and excellent electromagnetic shielding properties. For this reason, the use of such components has recently been expanded to include components such as computers, cameras, and mobile phones. In general, magnesium alloy parts are mostly manufactured by die casting. Recently, as much research has been conducted on the development of thin plates, the production of parts by molding thin plates is gradually increasing. However, magnesium has a dense hexagonal lattice (HCP) structure with few slip systems, which are essential for plastic deformation, so that rolling properties and moldability are poor, and thus cold rolling is difficult to be made in a certain amount (~ 20%) or more. Therefore, most of the thin plates are produced by hot or hot rolling and finally cold rolling for surface properties.

Magnesium alloy sheet casting machine, which manufactures thin plate directly from molten magnesium alloy through hot rolling, can be rolled into thin sheet at the same time as solid casting is performed by spraying magnesium alloy molten metal between casting rolls and rolling it like continuous casting of steel. It is configured to be.

However, since the temperature of the molten magnesium for hot rolling is about 650 °, the size of the nozzle for injecting magnesium gradually increases over time due to thermal expansion. Therefore, the injection angle of magnesium in the molten state injected from the nozzle is increased and the surface area of magnesium in contact with air is increased, thereby increasing the amount of oxide formed on the magnesium surface and the growth time of the oxide.

In addition, oxides are generated by contact of air and magnesium in a space formed by irregularly changing the gap between the casting rolls due to the increased magnesium inserted into the casting rolls.

The oxide thus grown scratches the casting roll, and is included in the magnesium thin plate to reduce the quality of the magnesium thin plate.

The present invention generates vibration in a certain direction in the magnesium sheet manufacturing apparatus, to prevent the growth of the oxide generated by contact with the air, to prevent the damage of the casting roll and to prevent the magnesium sheet from containing an excessive size of oxide. It is an object of the present invention to provide a magnesium sheet manufacturing apparatus.

Magnesium thin plate manufacturing apparatus for preventing the accumulation of oxide in accordance with an embodiment of the present invention, the nozzle unit including a nozzle is coupled to the crucible in which magnesium is melted is sprayed with magnesium molten metal of the crucible, is installed at a distance from the nozzle portion Magnesium molten metal sprayed from the nozzle unit may include an extrusion unit including a pair of rollers to be extruded, and a vibration unit coupled to the nozzle unit to generate vibration.

In addition, the vibration unit may be installed to generate vibration in a direction parallel to the direction in which the molten magnesium is injected.

In addition, the vibration unit may be installed so that the vibration displacement generated in a direction parallel to the direction in which the molten magnesium is injected ± 50㎛.

In addition, the vibration unit may be installed to generate vibration in a direction perpendicular to the direction in which the molten magnesium is injected.

In addition, the vibration unit may be installed so that the vibration displacement generated in the direction perpendicular to the direction in which the molten magnesium is sprayed to ± 20㎛.

In addition, the vibration unit may include one or more mechanical vibration members.

In addition, the mechanical vibration members may be installed at a predetermined interval from the nozzle unit.

In addition, the mechanical vibrating member includes a first mechanical vibrator and a second mechanical vibrator, the first mechanical vibrator is installed to generate vibration in a direction parallel to the direction in which the magnesium molten metal is injected, the second mechanical vibration The device may be installed to generate vibrations in a direction perpendicular to the direction in which the magnesium molten metal is injected.

As such, according to an embodiment of the present invention, it is possible to prevent the damage of the roller by preventing the growth of the oxide generated on the liquid surface in contact with the air exposed to the space between the nozzle and the roller, it is included in the magnesium thin plate By reducing the size of the oxides produced, it is possible to produce high quality magnesium sheets.

1 is a schematic diagram of a magnesium sheet production apparatus for preventing oxide accumulation according to a first embodiment of the present invention.
2 is a schematic view of a nozzle unit and an extrusion unit combined with a vibrating unit of a magnesium thin plate manufacturing apparatus for preventing oxide accumulation according to a first embodiment of the present invention.
3 is a schematic view of a nozzle unit and an extrusion unit in which a vibrating unit of a magnesium thin plate manufacturing apparatus for preventing oxide accumulation according to a modification of the first exemplary embodiment of the present invention is coupled.
Figure 4 is a schematic view of the nozzle unit coupled to the vibration unit according to the second embodiment of the present invention.
5 is a schematic view of a nozzle unit having a vibration unit coupled according to a modification of the second embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is also noted that the figures are schematic and not drawn to scale. The relative dimensions and ratios of the parts in the figures are shown exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. And to the same structure, element, or component appearing in more than one of the figures, the same reference numerals are used to denote corresponding or similar features in other embodiments.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the term "comprising" embodies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of.

Embodiments of the invention described with reference to a perspective view specifically illustrate an ideal embodiment of the invention. As a result, various variations of the illustration, for example variations in the manufacturing method and / or specification, are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture. The regions shown in the figures are only approximate in nature, and their forms are not intended to depict the exact form of the regions and are not intended to narrow the scope of the invention.

1 is a schematic diagram of a magnesium sheet production apparatus for preventing oxide accumulation according to a first embodiment of the present invention.

Referring to Figure 1, the magnesium plate production apparatus for preventing the accumulation of oxide according to the first embodiment of the present invention, the extrusion unit 20 is provided at a predetermined distance from the nozzle unit 10 and the nozzle unit 10 And a vibration unit 30 coupled to the nozzle unit to generate vibration.

The nozzle unit 10 according to the present exemplary embodiment may include a nozzle 11 coupled to the crucible 13 in which magnesium is melted and sprayed with the molten magnesium 14. Here, the molten magnesium sprayed from the nozzle 11 may be sprayed unfolded in a fan shape, as shown in FIG.

In addition, the extrusion unit 20 installed at a predetermined distance from the nozzle unit 10 may include a pair of rollers 21 and 22. Here, since the rollers 21 and 22 may be provided with a predetermined gap, a passage through which the magnesium molten metal injected from the nozzle unit 10 passes may be formed between the rollers 21 and 22. At this time, the rollers 21 and 22 have a cooling passage (not shown) formed therein so that a coolant (for example, water) is supplied thereto, or the rollers 21 and 22 are outside the rollers 21 and 22 in a cooling device (not shown) installed outside. The coolant supplied to the surface may be kept cooler than room temperature. Therefore, the molten magnesium sprayed from the nozzle 11 of the nozzle unit 10 begins to pass through the passage formed between the rollers 21 and 22, and solidification proceeds from the surface in contact with the rollers 21 and 22. After passing through the rollers 21, 22, a thin magnesium plate may be produced.

At this time, when the molten magnesium sprayed between the nozzle 11 and the rollers 21 and 22 comes into contact with air, solidification proceeds from the surface thereof, and the surface where the solidification proceeds (hereinafter, referred to as a liquid surface (meniscus)). Oxide may be formed by contact of magnesium with air.

However, in general, since the temperature of the magnesium molten metal 14 is about 650 °, when the magnesium molten metal 14 comes into contact with the nozzle 11, the nozzle 11 thermally expands. Therefore, as the contact time between the nozzle 11 and the magnesium molten metal 14 becomes longer, an injection angle of the magnesium molten metal 14 injected from the nozzle 11 may gradually increase. Therefore, when the nozzle 11 is thermally expanded, the surface area of the liquid surface of magnesium formed between the nozzle 11 and the rollers 21 and 22 may increase, thereby increasing the portion in contact with the air. As a result, the amount of oxide that can be formed on the surface of the liquid increases, and as the contact time between the oxide and air increases, the growth time of the oxide also increases, which may cause a problem of increasing the crystal size of the oxide.

Further, if the liquid surface whose surface area between the nozzle 11 and the rollers 21 and 22 is increased after the nozzle 11 is deformed by thermal expansion passes through the rollers 21 and 22, the rollers The passage between (21, 22) is increased in size by the pressure through the liquid surface with increased surface area. Therefore, the size of the gap between the rollers 21 and 22 gradually increases as the surface area of the liquid surface increases. Therefore, even in the liquid surface flowing into the passage between the rollers 21 and 22, a contact surface with air is formed to produce an oxide and increase the growth time of the oxide.

Accordingly, the surfaces of the rollers 21 and 22 may be damaged by the oxides grown on the increased liquid surface and the oxides grown between the rollers 21 and 22, and the grown oxides may be included in the magnesium thin plate.

Therefore, the vibration unit 30 for generating vibration by the power transmitted from the motor 40 may be coupled to the nozzle unit 10 according to the present embodiment. Here, the vibrator 30 generates a constant vibration in the nozzle unit 10, so that vibration is also transmitted to the liquid surface between the nozzle 11 and the rollers 21 and 22, so that the surface area is increased in the liquid surface. May hinder the growth of growing oxides.

As a result, the oxide grown on the liquid surface with the surface area formed by spraying from the thermally expanded nozzle 11 due to the vibration generated by the vibrating unit 30 coupled to the nozzle unit 10 is broken, thereby causing the Damage to the rollers 21 and 22 and growth of the oxide can be prevented from being included in the magnesium thin plate.

Figure 2 is a schematic view of the nozzle unit and the extrusion unit coupled to the vibrating unit of the magnesium sheet manufacturing apparatus for preventing oxide accumulation in the first embodiment of the present invention.

2, the nozzle unit 10 according to the present embodiment may include a nozzle 11 and a nozzle tab 12.

The nozzle tab 12 may be coupled to the outer surface of the nozzle 11 to protect the nozzle, and the vibrator 30 may be coupled to the nozzle tab 12. Here, the vibration generated in the vibrator 30 may be installed to generate vibration in a direction parallel to the direction in which the magnesium molten metal is sprayed. Here, the generated vibration displacement may be in the range of ± 50㎛. In addition, the vibrator 30 may include one or more mechanical vibrating members 31, and the mechanical vibrating member 31 may generate mechanical vibrations that are easily changed by changing a capacity of a motor. In addition, the mechanical vibrating members 31 may be installed on the outer surface of the nozzle tab 12 of the nozzle unit 10 at regular intervals to transmit vibrations in all directions of the nozzle unit 10.

In more detail, the mechanical vibration member 31 may include a first mechanical vibration device 311. As shown in FIG. 2, the first mechanical vibrator 311 may generate vibration in parallel with the direction in which the magnesium molten metal is injected from the nozzle. The range of the generated vibration is ± 50 μm, and the variation range of the mechanical vibration is It can be adjusted by changing the motor capacity. Thus, the oxides grown between the oxide grown on the liquid surface A with the increased surface area between the nozzle 11 and the rollers 21, 22 and the increased gap B between the rollers 21, 22 are It is possible to prevent growth beyond a predetermined size by vibration generated in the first mechanical vibrator 311.

However, the mechanical vibrating member 31 is not limited to the mechanical vibrating apparatus, and may be used as the vibration generating apparatus as long as it can generate vibration (for example, an ultrasonic apparatus).

3 is a schematic view of a nozzle unit and an extrusion unit combined with a vibrating unit of a magnesium thin plate manufacturing apparatus for preventing oxide accumulation according to another modification of the first exemplary embodiment of the present invention.

Referring to FIG. 3, the magnesium thin plate manufacturing apparatus for preventing the accumulation of oxides according to the present embodiment includes the prevention of the accumulation of oxides according to the first embodiment except for the vibration generating direction of the second mechanical vibrator 312. Magnesium thin plate is made for the same structure as the manufacturing apparatus for the description of the same structure is omitted.

Vibration generated from the vibration unit 30 according to the present embodiment can be installed to generate vibration in a direction perpendicular to the direction in which the molten magnesium is injected, as shown in FIG. Here, the generated vibration displacement may be in the range of ± 20㎛.

In addition, the vibrator 30 may include one or more mechanical vibration members 31, and the mechanical vibration members 31 may generate mechanical vibrations that are easily changed by changing a capacity of a motor.

In addition, the mechanical vibrating members 31 may be installed on the outer surface of the nozzle tab 12 of the nozzle unit 10 at regular intervals to transmit vibrations in all directions of the nozzle unit 10.

More specifically, the mechanical vibrating member 31 may include a second mechanical vibrating device 312, the second mechanical vibrating device 312, as shown in Figure 3, and the direction in which magnesium molten metal is injected from the nozzle The vibration can be generated vertically, the range of the generated vibration is ± 20㎛, where the variation range of the mechanical vibration can be adjusted by changing the capacity of the motor.

Thus, the oxides grown between the oxide grown on the liquid surface A with the increased surface area between the nozzle 11 and the rollers 21, 22 and the increased gap B between the rollers 21, 22 are It is possible to prevent growth beyond a certain size by vibration generated in the second mechanical vibrator 312.

However, the device capable of constituting the mechanical vibrating member 31 is not limited to the mechanical vibrating device, and may be used as the vibration generating device as long as it can generate vibration (for example, an ultrasonic device).

4 is a schematic view of a nozzle unit in which a vibration unit is coupled according to a second exemplary embodiment of the present invention.

Referring to Figure 4, the magnesium sheet production apparatus for preventing the accumulation of oxide according to the present embodiment is the first except for the installation position of the mechanical vibration devices (313, 314) constituting the mechanical vibration member 31 Since the same structure as the magnesium thin plate manufacturing apparatus for preventing the accumulation of oxides according to the embodiment will be omitted.

According to the present embodiment, the mechanical vibrating member 31 included in the vibrator 30 may include a third mechanical vibrator 313 and a fourth mechanical vibrator 314.

Here, the third mechanical vibrator 313 may generate vibration in a direction parallel to the direction in which the magnesium molten metal is injected, and the vibration displacement generated is ± 50 μm in a direction parallel to the direction in which the magnesium molten metal is injected. Can be.

In addition, the fourth mechanical vibrator 314 may generate vibration in a direction perpendicular to the direction in which the magnesium molten metal is injected, and the vibration displacement generated may be ± 20 μm in a direction parallel to the direction in which the magnesium molten metal is injected. Can be.

Here, the third mechanical vibrator 313 and the fourth mechanical vibrator 314 may be operated at the same time, or may be sequentially operated at a predetermined time interval. In addition, the vibration range generated by the mechanical vibration member 31 can be changed by a change in the capacity of the motor to generate mechanical vibration.

Accordingly, the apparatus for manufacturing a thin magnesium plate for preventing oxide accumulation according to the first embodiment or the modification of the first embodiment may generate vibration only in one of a direction parallel to or perpendicular to the spraying direction of the molten magnesium. According to the embodiment, it is possible to more effectively prevent the growth of the oxides generated on the liquid surface than the first embodiment by generating vibration in both directions parallel to and perpendicular to the injection direction of the molten magnesium.

5 is a schematic view of a nozzle unit having a vibration unit coupled according to a modification of the second embodiment of the present invention.

Referring to Figure 5, the magnesium plate production apparatus for preventing the accumulation of oxide according to the present embodiment is the first except the installation position of the mechanical vibration devices (313, 314) included in the mechanical vibration member 31 Since the same structure as the magnesium thin plate manufacturing apparatus for preventing the accumulation of oxides according to the embodiment will be omitted.

According to the present embodiment, the mechanical vibrating member 31 included in the vibrator 30 includes a pair of third mechanical vibrators 313 and a pair of fourth mechanical vibrators installed at positions opposite to each other ( 314).

As shown in FIG. 5, the pair of third mechanical vibrators 313 may be installed at upper and lower portions of the nozzle tab 12, respectively. In this case, the pair of third mechanical vibrators 313 may generate a vibration having a vibration range of ± 50 μm in a direction parallel to a direction in which the molten magnesium is injected from the upper and lower portions of the nozzle tab 12.

In addition, the pair of fourth mechanical vibrators 314 may be installed on the left side and the right side of the nozzle tab 12, respectively, as shown in FIG. In this case, the pair of fourth mechanical vibrators 314 may generate vibrations having a vibration range of ± 20 μm in a direction perpendicular to the direction in which the molten magnesium is injected from the left and right surfaces of the nozzle tab 12.

Here, the pair of third mechanical vibrator 313 and the pair of fourth mechanical vibrator 314 may be operated at the same time, or may be operated sequentially at a predetermined time interval. In addition, the vibration range generated by the mechanical vibration member 31 can be changed by a change in the capacity of the motor to generate mechanical vibration. In this case, the pair of third mechanical vibrators 313 may be sequentially operated at regular time intervals, and the pair of fourth mechanical vibrators 314 may be sequentially operated at regular time intervals.

Therefore, the apparatus for manufacturing a thin magnesium plate for preventing the accumulation of oxides according to the first embodiment or the modification of the first embodiment may generate vibration only in one of a direction parallel to or perpendicular to the spraying direction of the molten magnesium. Magnesium thin plate manufacturing apparatus according to the present embodiment is the oxide generated on the liquid surface by generating vibration in both directions in the direction parallel to and perpendicular to the spraying direction of the molten magnesium, and in the vertical direction of the nozzle tab 12 It is possible to more effectively prevent the growth of than in the first embodiment.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And it goes without saying that the invention belongs to the scope of the invention.

10: nozzle part 11: nozzle
12: nozzle tap 20: extrusion part
21, 22: roller 30: vibrating unit
31: mechanical vibration member 311, 312, 313,314: mechanical vibration device
40: motor

Claims (8)

A nozzle unit including a nozzle coupled to a crucible in which magnesium is melted and sprayed with magnesium molten metal of the crucible and a nozzle tab coupled to an outer surface of the nozzle;
An extruder including a pair of rollers installed at a distance from the nozzle and extruded from the nozzle, the molten magnesium; And
Is coupled to the nozzle tab of the nozzle unit includes a vibration unit for generating a vibration in a direction parallel to the direction in which the molten magnesium is injected or in a direction perpendicular to the direction in which the magnesium molten metal is injected,
The vibrator includes a first mechanical vibrator and a second mechanical vibrator installed at a predetermined interval, wherein the first mechanical vibrator has a vibration displacement of ± 50 μm in a direction parallel to a direction in which the magnesium molten metal is injected. It is installed to generate vibration to be within,
The second mechanical vibrating apparatus is magnesium plate manufacturing apparatus for preventing the accumulation of oxide is installed to generate a vibration in which the vibration displacement is within ± 20㎛ in the direction perpendicular to the direction in which the molten magnesium is injected. delete delete delete delete delete delete delete

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