KR20200047112A - Manufacturing apparatus for metal material and method thereof - Google Patents

Abstract

The present invention relates to a manufacturing apparatus for a metal material and a method thereof. The manufacturing apparatus for a metal material comprises: a vessel to provide a space to accommodate a molten material therein; a nozzle arranged on a lower portion of the vessel to discharge the molten material; a cooling roll separated from a lower portion of the nozzle to be rotatably arranged below the nozzle to solidify the molten material to manufacture a metal material; a magnetic field generation unit to form a magnetic field between the nozzle and the cooling roll to control the flow of the molten material; and a control unit to control an operation of the magnetic field generation unit to adjust the strength gradient applied between the nozzle and the cooling roll. When manufacturing an amorphous metal material, the flow of a molten material formed between the nozzle and the cooling roll can be controlled to stably perform work and manufacture a high-quality metal material.

Description

Metallic material manufacturing apparatus and method thereof

The present invention relates to a metal material manufacturing apparatus and method, and more particularly, to a metal material manufacturing apparatus and method capable of manufacturing an amorphous metal material having a uniform thickness.

In general, an amorphous alloy (hereinafter referred to as an amorphous alloy) is manufactured by rapidly cooling molten steel in a molten state. Accordingly, in the process of cooling the molten steel, it does not form crystalline and solidifies into a glassy state, that is, an amorphous state.

Amorphous metals, unlike conventional crystalline metals, have a glassy structure similar to a liquid phase that has no crystallinity due to the irregular arrangement of atoms. Therefore, the amorphous metal does not have a grain boundary, which is a characteristic of the crystalline metal, and there is no crystalline imperfection such as dislocation. In addition, the amorphous metal has characteristics such as excellent softness, toughness, corrosion resistance, and superconductivity compared to a crystalline metal having the same composition.

Methods of manufacturing the amorphous metal include die casting / permanent mold casting and melt spinning, among which the melt spinning method is mainly used.

The melt spinning method is also called PFC (Planar Flow Casting), and is a method of manufacturing an amorphous metal material such as a ribbon or a strip by supplying a melt to a cooling roll rotating at a high speed to rapidly cool and solidify it. When manufacturing an amorphous metal material in this way, one of the factors influencing the quality of the amorphous metal material is the flow of air generated by rotation of the cooling roll.

This causes air in the atmosphere to flow into the cooling roll rotating at high speed to oxidize the melt or destabilize the behavior of the melt accumulated on the cooling roll, that is, the puddle. When the behavior of the puddle becomes unstable due to the flow of air, vibration occurs in the puddle, which causes a deviation in the amount of melt attached to the cooling roll, resulting in a non-uniform thickness of the amorphous metal material, thereby deteriorating quality.

KR 1525189 B KR 2014-0123125 A

The present invention provides a metal material manufacturing apparatus and a method for manufacturing a metal material having a uniform thickness by controlling the flow of a melt.

The present invention provides a metal material manufacturing apparatus and a method for improving the product quality and productivity.

Metal material manufacturing apparatus according to an embodiment of the present invention, the container for providing a space for receiving the melt therein; A nozzle provided at the bottom of the container to discharge the melt; A cooling roll spaced apart from the lower portion of the nozzle and rotatably provided to solidify the melt to produce a metal material; A magnetic field generating unit capable of forming a magnetic field between the nozzle and the cooling roll to control the flow of the melt; And a control unit capable of controlling the operation of the magnetic field generating unit to adjust the intensity gradient applied between the nozzle and the cooling roll.

The magnetic field generating unit may generate a static magnetic field.

The magnetic field generating portion, both ends are disposed on both sides in the longitudinal direction of the cooling roll, the iron core is formed to adjust the distance between the both ends; A coil wound on at least a portion of the iron core; A power source for applying a current to the coil; And a driver for adjusting the distance between both ends of the iron core.

The iron core may include a first iron core and a second iron core, and at least one of a concave portion and a protruding portion may be formed at opposite ends of the first iron core and the second iron core so as to be engaged with each other in a sliding manner.

The iron core may include a first iron core, a second iron core, and a third iron core that is expandable and provided between the first iron core and the second iron core.

The power source may include a DC power source.

Further comprising; a measuring unit for measuring the thickness of the metal material, the control unit may control the operation of at least one of the power supply and the driver according to the thickness of the measured metal material.

The measuring unit may measure a distance at at least two points in the width direction of the metal material.

A method of manufacturing a metal material according to an embodiment of the present invention includes a process of preparing a melt inside a container; Rotating the cooling roll provided at the bottom of the container; Discharging the melt to the cooling roll; Applying a magnetic field in the longitudinal direction of the cooling roll to the melt discharged from the cooling roll; Controlling the flow of the melt by adjusting the strength gradient of the magnetic field in the longitudinal direction of the cooling roll; And solidifying the melt to produce a metal material.

The method may further include measuring the center thickness and the edge thickness in the width direction of the metal material, and the center thickness and the edge thickness may be measured simultaneously.

The process of controlling the flow of the melt may include calculating a thickness difference value in the width direction that is a difference between the measured center thickness and the measured edge thickness; And adjusting the strength gradient of the magnetic field formed in the longitudinal direction of the cooling roll to adjust the width direction thickness of the subsequent metal material to be manufactured when the calculated width difference value in the width direction is outside a predetermined range. You can.

The process of controlling the flow of the melt may include: calculating a difference in longitudinal thickness, which is a difference between at least one of the measured center thickness or the measured edge thickness and a target thickness of the metal material; And adjusting the strength of the magnetic field to adjust the longitudinal thickness of the subsequent metal material to be manufactured when the calculated difference in the longitudinal thickness is outside a predetermined range.

The method further includes continuously measuring at least one of the center thickness and the edge thickness, and controlling the flow of the melt comprises: calculating a variation in the longitudinal thickness, which is a difference between the measured thicknesses; And adjusting the strength of the magnetic field to adjust the longitudinal thickness of the metal material to be manufactured when the calculated amount of variation in the longitudinal thickness is outside a predetermined set variation range.

Metal material manufacturing method according to another embodiment of the present invention, the process of providing a melt in the container; Rotating the cooling roll provided at the bottom of the container; Discharging the melt to the cooling roll; Solidifying the melt to produce a metal material; Measuring the thicknesses of the metal material; And using the measured thicknesses, determining a magnetic field treatment method for a subsequent melt discharged to the cooling roll so as to control at least the width direction of the metal material.

The measuring of the thicknesses of the metal material includes measuring the center thickness in the width direction of the metal material and the edge thickness in the width direction of the metal material, respectively. Calculating a difference value between the measured center thickness and the measured edge thickness; Applying a magnetic field to the subsequent melt if the calculated difference value is outside a predetermined set range; And adjusting the strength gradient of the magnetic field applied in the longitudinal direction of the cooling roll to control the thickness in the width direction of the subsequent metal material to be manufactured.

The process of adjusting the width in the width direction of the subsequent metal material may include controlling a distance between both ends of the iron core of the magnetic field generating unit for applying a magnetic field in the longitudinal direction of the cooling roll.

The process of determining the magnetic field processing method includes: calculating a difference value between a measured center thickness or a measured edge thickness and a target thickness of the metal material; Applying a magnetic field to the subsequent melt if the calculated difference value is outside a predetermined set range; And adjusting the strength of the power of the magnetic field generator to adjust the longitudinal thickness of the subsequent metal material.

The measuring of the thicknesses of the metal material includes continuously measuring the center thickness in the width direction of the metal material and the edge thickness in the width direction of the metal material, and the determining of the magnetic field processing method comprises: Calculating a thickness variation that is a difference between measured center thicknesses or measured edge thicknesses; Applying a magnetic field to the subsequent melt if the calculated amount of variation is outside a predetermined set variation range; And adjusting the strength of the power of the magnetic field generator to adjust the longitudinal thickness of the subsequent metal material to be manufactured.

The process of adjusting the thickness in the longitudinal direction of the metal material may be performed before the process of controlling the thickness in the width direction of the metal material.

The process of applying the magnetic field may include applying a static magnetic field in the longitudinal direction of the cooling roll using a DC power source.

According to the embodiment of the present invention, when the amorphous metal material is manufactured, the operation of the melt injected between the nozzle and the cooling roll can be controlled to stably perform the operation, and a high quality metal material can be manufactured. That is, by forming a static magnetic field between the nozzle and the cooling roll, it is possible to suppress the vibration of the puddle by stabilizing the behavior of the melt discharged to the cooling roll. In addition, it is possible to improve the quality and productivity of the metal material by controlling the strength and intensity gradient of the static magnetic field during the manufacture of the metal material to suppress the thickness of the metal material from being uneven due to the vibration or flow of the puddle.

In addition, by controlling the strength and intensity gradient of the static magnetic field, it is possible to manufacture a high-quality metal material by adjusting the thickness in the length and width directions of the metal material.

1 is a view schematically showing a metal material manufacturing apparatus according to an embodiment of the present invention.
Figure 2 is a view showing the flow of air between the nozzle and the cooling roll when manufacturing a metal material.
3 is a perspective view schematically showing a magnetic field generating unit.
4 is a view for explaining the principle of adjusting the strength of the magnetic field.
5 is a view showing various embodiments of a magnetic field generator.
6 is a view schematically showing the installation state of the measuring unit.
7 is a flowchart sequentially showing a method of manufacturing a metal material according to an embodiment of the present invention.
8 is a flowchart sequentially showing a method of manufacturing a metal material according to a modification of the present invention.

Hereinafter, a mold for casting according to an embodiment of the present invention and a casting method using the same will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and the scope of the invention to those skilled in the art is completely It is provided to inform you.

1 is a view schematically showing a metal material manufacturing apparatus according to an embodiment of the present invention, FIG. 2 is a view showing the flow of air between a nozzle and a cooling roll when manufacturing a metal material, and FIG. 3 is a schematic diagram of a magnetic field generator 4 is a view for explaining the principle of adjusting the strength of the magnetic field, and FIG. 5 is a view showing various embodiments of the magnetic field generating unit.

Referring to FIG. 1, a metal material manufacturing apparatus according to an embodiment of the present invention includes a container 100 that provides a space for accommodating a melt therein, and a lower part of the container 100 to discharge the melt. The nozzle 110 and the nozzle 110 to control the flow of the cooling roll 120 and the melt provided at a lower portion of the nozzle 110 so as to be rotatable and solidify the melt to produce a metal material. A magnetic field generating unit 200 capable of applying a static magnetic field between the cooling rolls 120 may be included. In addition, the metal material manufacturing apparatus includes a measuring unit 300 capable of measuring the thickness of the metal material, and a control unit 400 capable of controlling the operation of the magnetic field generating unit 200 according to the measured thickness of the metal material. can do.

 Here, the melt may include molten steel, and the container 100 may include a tundish.

And the metal material manufacturing apparatus according to an embodiment of the present invention is to produce an amorphous product that solidifies in a state such as glass by rapidly cooling the melt before forming crystalline. Such an amorphous product may include a metal material having a thickness of about 15 to 40 μm, a width of about several mm to several hundred mm, and elongated, such as a ribbon or a strip.

The container 100 may be formed in a hollow shape in which an upper portion is opened so that a melt can be charged therein. In addition, an outlet (not shown) capable of discharging the melt may be formed at the bottom of the container 100, for example, at the bottom.

The cooling roll 120 may be provided to be spaced apart from the container 100 under the container 100. The cooling roll 120 may be formed in a cylindrical shape extending in one direction. At this time, the direction in which the cooling roll 120 extends is referred to as a longitudinal direction of the cooling roll. In addition, the direction corresponding to the longitudinal direction of the cooling roll in the metal material is called the width direction of the metal material, and the direction extending in the rotational direction of the cooling roll 120 is called the longitudinal direction of the metal material.

The cooling roll 120 may have a flow path capable of moving the cooling medium therein, and the cooling roll 120 may maintain a relatively low temperature by the cooling medium. And the cooling roll 120 may be provided to be rotatable at high speed. At this time, the cooling roll 120 may rotate at a rate of about 90 to 110 km per hour. Accordingly, the cooling roll 120 may form a thin and long metal material such as a ribbon or a strip by rapidly cooling and solidifying the melt by attaching the melt to the outer circumferential surface.

The nozzle 110 may be provided on the lower portion of the container 100, that is, on the bottom surface, to supply the melt discharged through the outlet to the cooling roll 120. The nozzle 110 may include a nozzle body 112 and an injection port 114 communicating with the discharge port and formed to penetrate the nozzle body 112. The nozzle body 112 is disposed parallel to the direction in which the cooling roll 120 extends, and the injection hole 114 is formed in a slit shape along the direction in which the nozzle body 112 extends, and thus the longitudinal direction of the cooling roll 120. The melt can be discharged along. In addition, the nozzle body 112 is disposed so as to be spaced apart from the cooling roll 120, it is possible to form a space in which the melt can be discharged between the cooling roll 120.

Referring to FIG. 2, the melt discharged to the cooling roll 120 through the injection port 114 of the nozzle 110 may form a melt pool, aka a puddle, by interfacial tension. The puddle may be shaped by flow due to the self-viscosity of the melt and interfacial tension between the nozzle 110 and the cooling roll 120. Here, the flow due to the viscosity of the melt is determined by the temperature of the melt and the rotation speed of the cooling roll 120. However, since the gap between the nozzle 110 and the cooling roll 120 is very small, the stability of the behavior of the puddle and the length of the puddle can be determined by the interfacial tension of the melt and air. At this time, the puddle should be formed to have a predetermined length in the front and rear directions of the rotation direction of the cooling roll 120 based on the inlet 114 between the nozzle 110 and the cooling roll 120 to use a metal material such as a ribbon or a strip. It can be manufactured stably. Here, the puddle disposed at the rear with respect to the injection hole 114 is called a rear end, and the puddle disposed at the front is called a front end.

However, as shown in FIG. 2, the air flow generated while the cooling roll 120 rotates at a high speed in the rear of the inlet 114 impacts the rear end of the puddle, and the impact is applied to the front end of the puddle. It also affects wealth. For example, the flow of air from the rear of the inlet 114 pushes the rear end of the puddle in the rotational direction of the cooling roll 120, thereby shortening the length of the rear end of the puddle, and the length of the front end of the puddle is increased due to the effect. Due to this phenomenon, the stability of the behavior of the puddle is lowered, and vibration occurs in the rotational direction of the cooling roll 120, that is, in the longitudinal direction of the puddle. The vibration generated in the puddle may cause problems such as a variation in the thickness of the puddle and a thickness variation of the metal material, and a decrease in the surface roughness of the metal material.

In addition, since the metal material is manufactured while forming the puddle on the cooling roll 120 that rotates at high speed, thickness variations may occur in the center region and both edge regions in the width direction of the metal material. That is, puddle positioned at both edge regions in the longitudinal direction of the cooling roll 120 may exhibit a tendency to move outwardly of the cooling roll 120. Accordingly, the puddle flows outward from the cooling roll 120 in both edge regions in the width direction of the metal material, for example, while spreading, the central thickness of the metal material may be thicker than the thickness of both edge regions.

Accordingly, in the present invention, by controlling the flow of the puddle by applying a static magnetic field between the nozzle 110 and the cooling roll 120, it is possible to suppress the puddle from vibrating. In particular, a static magnetic field may be applied to form a magnetic field of constant strength between the nozzle 110 and the cooling roll 120 over time. The static magnetic field refers to a magnetic field formed around a stationary magnet or a stationary conductor through which a normal current flows, and the strength of the magnetic field is maintained constant over time. In addition, the static magnetic field may play a role of slowing or suppressing the flow or the overall behavior of the molten material (melt steel) in the region where the force of the magnetic field is applied. In an embodiment of the present invention, by applying a static magnetic field to a melt having electrical conductivity, the behavior or flow of the puddle is reduced by reducing the flow of the melt by applying a Lorentz force in the opposite direction in which the relative velocity of the static magnetic field and the melt occurs. Can be stabilized. In addition, through this, the vibration and flow of the puddle can be suppressed to produce a metal material having a uniform thickness and excellent surface quality.

Referring to FIG. 3, the static magnetic field generating unit 200 provides an iron core 210, a coil 220 wound around at least a portion of the iron core 210, and a power source 230 for applying direct current to the coil 220. It can contain. In addition, the static magnetic field generating unit 200 may include a driver 240 for adjusting the length of the iron core 210.

The iron core 210 is formed to extend in one direction, and both ends may be formed to be bent to face each other. At this time, the iron core 210 may be formed to adjust the distances L0 and L1 between both ends as shown in FIG. 4A. For example, the iron core 210 may be formed to be divided into a first iron core 210a and a second iron core 210b.

When the distances L0 and L1 between both ends of the iron core 210 are adjusted, the intensity gradient of the static magnetic field formed between both ends of the iron core 210 can be adjusted. When a DC current is applied to the coil 220, a static magnetic field may be applied between both ends of the iron core 210.

Referring to (b) of FIG. 4, the static magnetic field does not have the same strength between both ends of the iron core 210, and the strength of the static magnetic field increases from the center to the edge between both ends of the iron core 210, for example, an iron core ( 210) has a parabolic gradient that is symmetrical to the left and right based on the center between both ends. At this time, the difference between the static magnetic field strength at the center and the static magnetic field strength at the edge changes depending on the distance between both ends of the iron core 210. For example, when the distance between both ends of the iron core 210 increases from L0 to L1, the difference between the static magnetic field strength at the center and the static magnetic field strength at the edge decreases at the center between both ends of the iron core 210. On the other hand, when the distance between both ends of the iron core 210 decreases, the difference between the static magnetic field strength at the center and the static magnetic field strength at the edge increases at the center between both ends of the iron core 210. By controlling the distance between both ends of the iron core 210 using this principle, the strength gradient of the static magnetic field applied to the cooling roll 120 can be controlled to adjust the thickness in the width direction of the metal material.

5, various forms of the iron core 210 are shown.

The iron core 210 may include a first iron core 210a and a second iron core 210b provided on one side of the first iron core 210a. At this time, one end of the first iron core 210a may be bent toward one side of the cooling roll 120, and one end of the second iron core 210b may be bent toward the other side of the cooling roll 120.

A concavo-convex structure may be formed on the other end of the first iron core 210a adjacent to the second iron core 210b and the other end of the second iron core 210b adjacent to or opposite to the other end of the first iron core 210a. . At this time, the uneven structure may include a protruding portion and a concave portion, and the protruding portion and the concave portion may be formed to be engaged in a sliding manner. At this time, at least a portion of the uneven structure may be disposed inside the coil 220. In addition, when the first iron core 210a and the second iron core 210b are spaced apart in order to adjust the distance between both ends of the iron core 210, it is preferable that the spaced parts are disposed inside the coil 220.

Referring to (a) of FIG. 5, recesses and protrusions are formed at the other end of the first iron core 210a, and recesses and protrusions formed at the other end of the first iron core 210a are formed at the other end of the second iron core 210b. Protrusions and recesses that can be engaged with may be formed.

Referring to (b) of FIG. 5, two protrusions may be formed at the other end of the first iron core 210a, and a recess may be formed between the protrusions. Further, at the other end of the second iron core 210b, one protruding portion that can be engaged with the concave portion of the first iron core 210a and two concave portions that can be engaged with the protruding portion of the first iron core 210a may be formed. .

Referring to (c) of FIG. 5, two protrusions and two recesses may be formed at the other end of the first iron core 210a, and at the other end of the second iron core 210b, the protrusion of the first iron core 210a and Two projections and two recesses that can be engaged with the recesses can be formed.

Referring to FIG. 5D, recesses and protrusions are formed at the other end of the first iron core 210a, and recesses and protrusions may be formed at the other end of the second iron core 210b. At this time, the protrusions formed on the first iron core 210a and the second iron core 210b may be formed in a shape that narrows toward the end.

In addition, the first iron core 210a and the second iron core 210b may, of course, be formed with a concavo-convex structure of various shapes capable of adjusting the distance between both ends of the iron core 210.

In addition, referring to (e) of FIG. 5, a stretchable third iron core 210c may be provided between the first iron core 210a and the second iron core 210b. At this time, the third iron core 210c may be formed in a corrugated tube shape capable of stretching and contraction. The third iron core 210c is connected to the other end of the first iron core 210a and the other end of the second iron core 210b, so that at least one of the first iron core 210a and the second iron core 210b is moved. Elongation or contraction while connected to the iron core 210a and the second iron core 210b, and the distance between both ends of the iron core 210 can be adjusted.

At this time, the distance between both ends of the iron core 210 may be adjusted using the driver 240. The driver 240 may be provided to move the first iron core 210a and the second iron core 210b. In FIG. 2, the driver 240 is illustrated as being connected to the first iron core 210a and the second iron core 210b, respectively, but may be connected to at least one of the first iron core 210a and the second iron core 210b. . However, the driver 240 is preferably connected to the iron core 210 so that the first iron core 210a and the second iron core 210b can move the same distance along the longitudinal direction of the cooling roll 120. This is because, as described above, the static magnetic field is formed in a symmetrical shape based on the center between both ends of the iron core 210. That is, when one of the first iron core 210a and the second iron core 210b is moved to adjust the distance between both ends of the iron core 210, the center may be changed between both ends of the iron core 210. In this case, since the gradient of the strength of the static magnetic field is applied asymmetrically along the width direction of the metal material, thicknesses of both edges of the metal material may be different.

The iron core 210 on which the coil 220 is wound may be installed to apply a static magnetic field to the space between the nozzle 110 and the cooling roll 120, that is, the puddle. At this time, the iron core 210 may be disposed at both ends of the iron core 210 in the longitudinal direction of the cooling roll 120 so as to apply a static magnetic field along the width direction of the metal material.

In addition, the measurement unit 300 may be installed at one side of the cooling roll 120, for example, a molten material cooled by the cooling roll 120 is formed of a metal material such as a ribbon. The measuring unit 300 may be installed to be spaced apart from the cooling roll 120 to measure the thickness of the metal material formed by the cooling roll 120.

Referring to FIG. 6, the measurement unit 300 includes a first measurement unit 300a capable of measuring the center thickness in the width direction of a metal material, and a second measurement unit 300b capable of measuring the edge thickness of the metal material. ). In this case, the first measurement unit 300a and the second measurement unit 300b may simultaneously measure the center thickness and the edge thickness of the metal material, or may selectively measure the center thickness and the edge thickness of the metal material. The measurement unit 300 may be an X-ray thickness meter, a laser sensor, an eddy current sensor, or the like.

The control unit 400 may control the operation of the magnetic field generator 200. In addition, the control unit 400 may control at least one of the power source 230 and the driver 240 of the magnetic field generating unit 200 to adjust the strength of the static magnetic field according to the thickness of the metal material measured by the measuring unit 300 You can.

Through such a configuration, when the metal material is manufactured, the operation between the nozzle 110 and the cooling roll 120 can be suppressed or prevented from being unstable in the behavior of the melt, that is, the puddle, so that the operation can be stably performed and a high quality metal material is produced. can do.

Hereinafter, a method of manufacturing a metal material according to an embodiment of the present invention will be described.

7 is a flowchart sequentially showing a method of manufacturing a metal material according to an embodiment of the present invention, and FIG. 8 is a flowchart sequentially showing a method of manufacturing a metal material according to a modification of the present invention.

In the embodiment of the present invention, by applying a static magnetic field between the nozzle 110 and the cooling roll 120 in the embodiment of the present invention to suppress the vibration of the puddle caused by the high-speed rotation of the cooling roll 120, A method for constantly controlling the shape or behavior of the puddle is presented. That is, by applying a suit length to the puddle, the Lorentz force is generated in the opposite direction to the direction in which the puddle vibrates, thereby suppressing the puddle from vibrating, and thereby controlling the shape of the puddle. In addition, by adjusting the intensity gradient of the static magnetic field, it is possible to effectively control the thickness in the longitudinal and width directions of the metal material by controlling the flow in the direction in which the puddle vibrates as well as the direction in which the puddle vibrates. At this time, the thickness in the longitudinal direction of the metal material can be adjusted first and then the thickness in the width direction.

A method of manufacturing a metal material according to an embodiment of the present invention will be described with reference to FIG. 7.

Metal material manufacturing method according to an embodiment of the present invention, the process of casting the metal material while discharging the melt to the rotating cooling roll 120, and the flow of the melt by applying a static magnetic field to the melt discharged to the cooling roll 120 It may include the process of controlling the.

First, when a melt is provided in the container 100, the cooling roll 120 provided under the container 100 may be rotated. Thereafter, the metal material may be manufactured or cast (S100) while discharging the melt accommodated in the container 100 through the nozzle 110 to the cooling roll 120. At this time, the casting may be performed while controlling the discharge rate of the melt or the rotation speed of the cooling roll 120 so that the metal material can be formed to a target thickness.

The melt discharged from the container 100 may form a puddle between the nozzle 110 and the cooling roll 120.

When the melt is discharged to the cooling roll 120, a static magnetic field may be applied between the nozzle 110 and the cooling roll 120 by supplying direct current to the coil 220 of the magnetic field generator 200 (S102). The melt discharged to the cooling roll 120, that is, the puddle causes vibration by the flow of air generated by the high-speed rotation of the cooling roll 120. At this time, vibration may be suppressed while the flow of the melt is reduced by the Lorentz force of the static magnetic field applied between the nozzle 110 and the cooling roll 120.

As described above, while applying a static magnetic field between the nozzle 110 and the cooling roll 120 and manufacturing a metal material, the thickness of the metal material may be measured using the measuring unit 300 (S104). At this time, the process of measuring the thickness of the metal material is a process for measuring the thickness change in the longitudinal direction of the metal material, using the first measuring unit 300a to measure the center thickness in the width direction of the metal material, or the second The edge thickness may be measured in the width direction of the metal material using the measurement unit 300b. In this embodiment, an example in which the center thickness is measured in the width direction of the metal material using the first measurement unit 300a will be described.

The thickness measurement of the metal material using the measurement unit 300 may be continuously or intermittently performed during the entire process during casting. At this time, the metal material may be cast while the thickness of the cooling roll 120 is rotated at a high speed and the thickness changes within a certain range due to vibration or flow of the puddle.

When the measured center thickness of the metal material is too thick or too thin, a metal material having a uniform thickness in the longitudinal direction of the metal material can be obtained by controlling the strength of the static magnetic field to control the flow of the melt.

Therefore, in order to control the strength of the static magnetic field applied between the nozzle 110 and the cooling roll 120 according to the measured thickness of the metal material, a criterion for adjusting the strength of the static magnetic field may be determined.

A criterion for adjusting the strength of a static magnetic field can be determined as follows using an error range of a target thickness of a metal material.

First, when the difference between the measured thickness of the metal material and the target thickness is outside a predetermined set range, for example, the first set range, the strength of the static magnetic field applied between the nozzle 110 and the cooling roll 120 is adjusted. You can. At this time, the set range may be 0 to 10% of the target thickness of the metal material. This range can be adjusted to have various ranges as needed.

Second, the thickness variation, which is a difference between the thicknesses of the metal materials measured using the measurement unit 300, is calculated, and when the variation in thickness is outside a preset variation range, the nozzle 110 and the cooling roll 120 ) The intensity of the static magnetic field applied between can be adjusted. At this time, the set variation range may be 0 to 5% of the target thickness of the metal material. The set variation range is set to be narrower than the set range because the difference value may be too large when one of the at least two measurement thicknesses for calculating the thickness variation is smaller than the target thickness and the other is larger than the target thickness. In addition, the setting variation range may be adjusted to have various ranges as necessary.

First, a method of determining whether to adjust the intensity of a static magnetic field using a set range, for example, a first set range, will be described.

When the thickness of the metal material is measured through the first measurement unit 300a, a difference value between the measured thickness of the metal material and the target thickness is calculated. Then, if the calculated difference value is included in the first set range (S140), it is determined that the metal material is manufactured with a relatively constant thickness in the longitudinal direction, while maintaining the strength of the initially applied static magnetic field without adjusting the strength of the static magnetic field. Casting is carried out. For example, when the amount of thickness variation in the longitudinal direction of the metal material is included in a preset range, vibration of the puddle is suppressed and it can be determined that casting is normally performed. For example, if the target thickness of the metal material is 20 μm, and the thickness of the metal material is measured in the range of 19 to 21 μm, the difference between the measured thickness of the metal material and the target thickness is within a preset range of 2 μm, that is, of the metal material. It may be included in 0 to 10% of the target thickness. Accordingly, the vibration of the puddle is suppressed, and it can be determined that casting is normally performed.

On the other hand, when the calculated difference value is outside the set range (S106), the strength of the static magnetic field may be adjusted to adjust the thickness of the metal material in the longitudinal direction (S108). At this time, the intensity of the static magnetic field may be increased by increasing the applied current through the power source 230 of the magnetic field generator 200. Accordingly, the flow of the melt between the nozzle 110 and the cooling roll 120 is suppressed, so that a metal material having a constant thickness in the longitudinal direction can be cast. For example, if the target thickness of the metal material is 20 μm, and the thickness of the metal material is measured in the range of 17 to 23 μm, it may be determined that the puddle is greatly vibrated and casting is not normally performed. That is, since the difference between the measured thickness of the metal material and the target thickness exceeds 2 μm, the difference value is outside the preset range, that is, 0 to 10% of the target thickness of the metal material. It can be judged that casting is not normally performed. Accordingly, the current supplied to the coil 220 of the magnetic field generator 200 may be increased to increase the strength of the static magnetic field applied between the nozzle 110 and the cooling roll 120.

Next, a method of determining whether to adjust the intensity of the static magnetic field using the set variation range will be described.

When the thickness of the metal material is measured through the measurement unit 300, a difference value, that is, a thickness variation amount is calculated from the measured thicknesses of the metal material. Then, the calculated thickness variation and the predetermined set variation range are compared with each other (S106), and when the calculated thickness variation is included in the set variation range, it is determined that the metal material is manufactured with a relatively constant thickness in the longitudinal direction, and the static magnetic field. Casting is performed without maintaining the strength of the initially applied static magnetic field without adjusting the strength of the. For example, if the target thickness of the metal material is 20 μm, and the measured thickness of the metal material is measured at 19 μm and 20 μm, the thickness variation in the longitudinal direction of the metal material may be calculated as 1 μm. In this case, since the amount of variation in the thickness of the metal material is included in a predetermined set variation range, that is, 0 to 5% of the target thickness of the metal material, it can be determined that casting of the puddle is suppressed and casting is normally performed. Therefore, casting can be performed while maintaining the strength of the initially applied static magnetic field without adjusting the strength of the static magnetic field.

On the other hand, if the calculated amount of variation in the thickness is outside the predetermined set variation range (S106), the strength of the static magnetic field may be adjusted (S108). At this time, the intensity of the static magnetic field may be increased by increasing the applied current through the power source 230 of the magnetic field generator 200. Accordingly, the flow of the melt between the nozzle 110 and the cooling roll 120 is suppressed, so that a metal material having a constant thickness in the longitudinal direction can be cast. For example, if the target thickness of the metal material is 20 μm, and the measured thickness of the metal material is measured as 18 μm and 22 μm, the thickness variation of the metal material in the longitudinal direction may be calculated as 4 μm. In this case, since the calculated amount of variation in thickness deviates from a predetermined set variation range, that is, 0 to 5% of the target thickness of the metal material, the current supplied to the coil 220 of the magnetic field generator 200 is increased to increase the nozzle 110 ) And the strength of the static magnetic field applied between the cooling rolls 120.

When the thickness of the metal material is adjusted in this way, the thickness of the metal material can be measured again and the thickness of the metal material can be adjusted using the measurement result.

The width of the metal material in the width direction may be adjusted by adjusting the distance between both ends of the iron core 210 constituting the magnetic field generating unit 200. At this time, the width in the width direction of the metal material can be adjusted by adjusting the distance between both ends of the iron core 210 to adjust the strength gradient of the static magnetic field in the width direction of the metal material or in the longitudinal direction of the cooling roll 120.

First, in order to adjust the intensity gradient of the static magnetic field according to the measured center thickness and the edge thickness of the metal material, a criterion for adjusting the intensity gradient of the static magnetic field may be determined.

A criterion for adjusting the strength of the static magnetic field may be determined according to a difference value between the center thickness and the edge thickness in the width direction of the metal material.

If the difference between the center thickness and the edge thickness in the width direction of the metal material is outside a predetermined setting range, for example, the second setting range, the distance between both ends of the iron core 210 is adjusted to increase the intensity gradient of the static magnetic field in the width direction of the metal material. By adjusting, the thickness in the width direction of the metal material can be adjusted. At this time, when adjusting the thickness in the longitudinal direction of the metal material, the center thickness was measured in the width direction of the metal material, and this was compared with the target thickness to adjust the thickness in the longitudinal direction of the metal material. Therefore, it is assumed that the metal material is manufactured in a constant thickness in the longitudinal direction, that is, the target thickness, and the second set range can be set to about 0 to 10% with respect to the target thickness of the metal material. This setting range can be adjusted to have various ranges as needed.

To adjust the thickness of the metal material in the width direction, the center thickness and the edge thickness may be measured in the width direction of the metal material using the first measurement unit 300a and the second measurement unit 300b (S110). At this time, the first measurement unit 300a and the second measurement unit 300b are installed at the same height in the width direction of the metal material, and the center thickness and the edge thickness of the metal material can be simultaneously measured.

When the center thickness and the edge thickness of the metal material are respectively measured, a difference value between the center thickness and the edge thickness of the metal material can be calculated. Then, the calculated difference value may be compared with a predetermined second set range (S112).

As a result of comparison, if the difference between the center thickness and the edge thickness of the metal material is included in the set range, that is, 0 to 10% of the target thickness of the metal material, it is determined that the metal material is manufactured to have a constant thickness in the width direction. , Casting may be performed while maintaining the distance between both ends of the iron core 210. And when the casting is completed (S116), the application of the static magnetic field between the nozzle 110 and the cooling roll 120 is stopped (S118), and the casting is terminated.

On the other hand, if the difference between the center thickness and the edge thickness of the metal material is not included in the second set range, that is, 0 to 10% of the target thickness of the metal material, it is determined that the metal material does not have a constant thickness in the width direction. , By adjusting the distance between both ends of the iron core 210, it is possible to adjust the thickness in the width direction of the metal material. For example, when the target thickness of the metal material is 20 μm, when the center thickness of the metal material is measured as 21 μm, and when the edge thickness of the metal material is measured as 18 μm, the difference between the center thickness and the edge thickness of the metal material is 3 It can be calculated in μm. In this case, since the difference value is not included in the set range, i.e., 0 to 10% of the target thickness of the metal material, it can be determined that casting is not normally performed because the puddle flows in the width direction of the cooling roll 120. . Therefore, it is possible to shorten or increase the distance between both ends of the iron core 210 to adjust the intensity gradient of the static magnetic field applied between the nozzle 110 and the cooling roll 120.

For example, when the difference between the center thickness of the metal material and the edge thickness is outside the set range, and the center thickness is thicker than the edge thickness, it may be determined that the flow of the puddle from the edge is not properly controlled in the width direction of the metal material. The distance between both ends of the iron core 210 may be reduced to increase the difference between the strength of the static magnetic field at the center of the metal material and the strength of the static magnetic field at the edge (see FIG. 4B).

On the other hand, if the difference between the center thickness of the metal material and the edge thickness is outside the set range, and the thickness of the edge is greater than the center thickness, it can be determined that the flow of the puddle is controlled too much than the center in the width direction of the metal material. have. By increasing the distance between both ends of the iron core 210, the difference in the strength of the static magnetic field at the center of the metal material and the strength of the static magnetic field at the edge can be reduced.

Thereafter, when the casting is completed (S116), the application of the static magnetic field is stopped between the nozzle 110 and the cooling roll 120 (S118), and the casting is terminated.

In the above, a method of continuously applying a static magnetic field between the nozzle 110 and the cooling roll 120 while casting a metal material has been described. However, instead of continuously applying between the nozzle 110 and the cooling roll 120, a static magnetic field may be selectively applied between the nozzle 110 and the cooling roll 120 according to the thickness of the metal material.

Hereinafter, a modified example of the present invention will be described with reference to FIG. 8.

Metal material manufacturing method according to a modification of the present invention, the process of casting the metal material while solidifying by discharging the melt on a rotating cooling roll, and the process of measuring the thickness of the metal material and the cooling roll using the measured thickness And determining a magnetic field treatment method for the subsequent melt to be discharged.

When the melt is provided in the container 100, the cooling roll 120 provided under the container 100 may be rotated. Thereafter, the metal material may be manufactured (S200) while discharging the melt accommodated in the container 100 through the nozzle 110 to the cooling roll 120. At this time, the casting may be performed while controlling the discharge rate of the melt or the rotation speed of the cooling roll 120 so that the metal material can be formed to a target thickness.

As described above, while casting the metal material, the thickness of the cast metal material may be measured using the measuring unit 300 (S202). At this time, the process of measuring the thickness of the metal material is a process for measuring the thickness change in the longitudinal direction of the metal material, using the first measuring unit 300a to measure the center thickness in the width direction of the metal material, or the second The edge thickness may be measured in the width direction of the metal material using the measurement unit 300b. In this modified example, an example in which the center thickness is measured in the width direction of the metal material using the first measurement unit 300a will be described.

Measurement of the thickness of the metal material using the measuring unit 300 may be performed in all processes during casting. At this time, the metal material may be cast with a certain range of thickness variation due to vibration or puddle flow generated as the cooling roll 120 rotates at a high speed.

It is possible to determine a processing method for a subsequent melt discharged to the cooling roll 120 by using the center thickness of the metal material measured while casting the metal material. Here, the subsequent melt may mean a melt to be made of a metal material in the future, that is, a melt that has not yet been discharged from the container. In addition, the metal material made of the subsequent melt may mean a subsequent metal material made of the subsequent melt whose flow is controlled.

First, a difference value between the measured center thickness of the metal material and the target thickness of the metal material can be calculated.

If the calculated difference value is included in a predetermined first set range (S204), casting may be performed without applying a static magnetic field between the nozzle 110 and the cooling roll 120. In addition, a process for adjusting the thickness in the width direction of the metal material may be performed.

On the other hand, if the calculated difference value is not included in the predetermined first set range (S204), a static magnetic field may be applied between the nozzle 110 and the cooling roll 120 (S206). And by controlling the power of the magnetic field generating unit 200 to control the intensity of the current applied to the coil 220 to control the flow of the subsequent melt to be discharged to the cooling roll 120 to increase the longitudinal thickness of the metal material. It can be adjusted (S207). Then, the difference between the center thickness and the target thickness of the subsequent metal material measured while casting the subsequent metal material using the flow-controlled subsequent melt is calculated, and when the calculated difference value is included in the first set range, the state Casting can be performed.

And the difference between the center thickness and the target thickness of the subsequent metal material measured while casting is continuously calculated, and when the calculated difference value is included in the first set range (S204), casting is performed without adjusting the strength of the static magnetic field. can do. However, if the calculated difference value is outside the first set range, the strength of the static magnetic field is increased by controlling the power source 230 of the magnetic field generator 200 to further control the flow of the subsequent melt to be discharged to the cooling roll 120. have.

Thereafter, a process for adjusting the width direction of the metal material may be performed.

Alternatively, a difference value, that is, a variation in thickness, may be calculated from the measured center thicknesses of the metal material.

When the calculated amount of variation in thickness is included in a predetermined set variation range (S204), casting can be performed without applying a static magnetic field between the nozzle 110 and the cooling roll 120. In addition, a process for adjusting the thickness in the width direction of the metal material may be performed.

On the other hand, if the calculated amount of thickness variation is not included in the predetermined set variation range (S204), a static magnetic field may be applied between the nozzle 110 and the cooling roll 120 (S206). And by controlling the power of the magnetic field generating unit 200 to control the intensity of the current applied to the coil 220 to control the flow of the subsequent melt to be discharged to the cooling roll 120 to increase the longitudinal thickness of the metal material. It can be adjusted (S207). In addition, the thickness variation in the longitudinal direction can be calculated from the center thickness of the subsequent metal material measured while casting the subsequent metal material using the flow-controlled subsequent melt, and the calculated thickness variation and the set variation range can be compared. Then, if the calculated amount of variation in thickness is included in the set variation range setting, casting can be performed while maintaining the strength of the static magnetic field.

And the thickness variation is continuously calculated from the center thickness of the subsequent metal material measured while casting, and if the calculated thickness variation is not included in the set variation range, the strength of the static magnetic field is adjusted, that is, the strength of the static magnetic field is increased (S206). After casting can be carried out.

When the thickness of the metal material is adjusted in this way, the thickness of the metal material can be measured again and the thickness of the metal material can be adjusted using the measurement result. The width of the metal material in the width direction may be adjusted by adjusting the distance between both ends of the iron core 210 constituting the magnetic field generating unit 200.

To adjust the thickness of the metal material in the width direction, the center thickness and the edge thickness may be measured in the width direction of the metal material using the first measurement unit 300a and the second measurement unit 300b (S208). At this time, the first measurement unit 300a and the second measurement unit 300b are installed at the same height in the width direction of the metal material, and the center thickness and the edge thickness of the metal material can be simultaneously measured.

When the center thickness and the edge thickness of the metal material are respectively measured, a difference value between the center thickness and the edge thickness of the metal material can be calculated. Then, the calculated difference value may be compared with a predetermined second set range (S210).

As a result of comparison, if the difference between the center thickness and the edge thickness of the metal material is included in the second set range, it is determined that the metal material is manufactured to have a constant thickness in the width direction, and the nozzle 110 and the cooling roll 120 Casting can be performed without applying a static magnetic field in between. Thereafter, when the casting is completed (S214), the static magnetic field is applied to the melt (S216), and then casting is finished.

On the other hand, if the difference between the center thickness and the edge thickness of the metal material is not included in the second set range, it is determined that the metal material does not have a constant thickness in the width direction, and between the nozzle 110 and the cooling roll 120. A static magnetic field may be applied (S212). And by adjusting the distance between both ends of the iron core 210, by adjusting the strength gradient of the static magnetic field applied in the longitudinal direction of the cooling roll 120 or the width direction of the metal material can be adjusted in the width direction of the metal material (S213).

Thereafter, when the casting is completed (S214), the application of the static magnetic field to the melt is confirmed (S216), and when the static magnetic field is applied, the application of the static magnetic field is stopped (S218), and then the process is terminated.

When a metal material is manufactured in this way, operation of the metal material can be suppressed and the puddle can be formed in an ideal shape, thereby stably performing the operation and having a uniform thickness in the longitudinal direction and the width direction. High-quality metal materials can be produced.

As described above, the present invention has been described with reference to the above-described embodiments and the accompanying drawings, but the present invention is not limited thereto and is limited by the claims below. Therefore, it will be appreciated by those of ordinary skill in the art that the present invention can be variously modified and modified without departing from the technical spirit of the claims below.

100: container 110: nozzle
120: cooling roll 200: magnetic field generating unit
300: measuring unit 400: control unit

Claims (20)

A container that provides space for receiving the melt therein;
A nozzle provided at the bottom of the container to discharge the melt;
A cooling roll spaced apart from the lower portion of the nozzle and rotatably provided to solidify the melt to produce a metal material;
A magnetic field generating unit capable of forming a magnetic field between the nozzle and the cooling roll to control the flow of the melt; And
And a control unit capable of controlling an operation of the magnetic field generating unit so as to adjust an intensity gradient applied between the nozzle and the cooling roll. The method according to claim 1,
The magnetic field generating unit is a metal material manufacturing apparatus for generating a static magnetic field. The method according to claim 1,
The magnetic field generating unit,
Both ends are disposed on both sides in the longitudinal direction of the cooling roll, the iron core is formed to adjust the distance between the both ends;
A coil wound on at least a portion of the iron core;
A power source for applying a current to the coil; And
Metal material manufacturing apparatus comprising a; driver for adjusting the distance between both ends of the iron core. The method according to claim 3,
The iron core,
Including the first iron core and the second iron core,
A metal material manufacturing apparatus in which at least one of the concave portion and the protruding portion is formed to be engaged with each other in a sliding manner at opposite ends of the first iron core and the second iron core. The method according to claim 3,
The iron core,
A method of manufacturing a metal material including a first iron core and a second iron core and a third iron core which is expandable and provided between the first iron core and the second iron core. The method according to claim 3,
The power source is a metal material manufacturing apparatus including a DC power source. The method according to claim 3,
Further comprising; a measuring unit for measuring the thickness of the metal material,
The control unit is a metal material manufacturing apparatus that can control the operation of at least one of the power source and the driver in accordance with the measured thickness of the metal material. The method according to claim 7,
The measuring unit,
Metal material manufacturing apparatus that can measure the distance at least two points in the width direction of the metal material. A process of preparing a melt inside the container;
Rotating the cooling roll provided at the bottom of the container;
Discharging the melt to the cooling roll;
Applying a magnetic field in the longitudinal direction of the cooling roll to the melt discharged from the cooling roll;
Controlling the flow of the melt by adjusting the strength gradient of the magnetic field in the longitudinal direction of the cooling roll; And
The process of manufacturing a metal material by solidifying the melt; a metal material manufacturing method comprising a. The method according to claim 9,
Further comprising the process of measuring the center thickness and the edge thickness in the width direction of the metal material,
Method of manufacturing a metal material comprising simultaneously measuring the center thickness and the edge thickness. The method according to claim 10,
The process of controlling the flow of the melt,
Calculating a thickness difference value in the width direction, which is a difference between the measured center thickness and the measured edge thickness; And
If the calculated width difference value in the width direction is outside a predetermined setting range, adjusting the strength gradient of the magnetic field formed in the longitudinal direction of the cooling roll to adjust the width direction thickness of the subsequent metal material to be manufactured. Material manufacturing method. The method according to claim 10,
The process of controlling the flow of the melt,
Calculating a difference in thickness in the longitudinal direction, which is a difference between at least one of the measured center thickness or the measured edge thickness and a target thickness of the metal material; And
When the calculated difference in the thickness in the longitudinal direction is outside a predetermined range, adjusting the strength of the magnetic field to adjust the longitudinal thickness of the subsequent metal material to be manufactured. The method according to claim 10,
Further comprising the step of continuously measuring at least one of the center thickness and the edge thickness,
The process of controlling the flow of the melt,
Calculating a variation in thickness in the longitudinal direction, which is a difference between measured thicknesses; And
A method of manufacturing a metal material, including; adjusting the strength of the magnetic field to adjust the longitudinal thickness of the metal material to be manufactured when the calculated amount of variation in the longitudinal thickness is outside a predetermined set variation range. A process of preparing a melt inside the container;
Rotating the cooling roll provided at the bottom of the container;
Discharging the melt to the cooling roll;
Solidifying the melt to produce a metal material;
Measuring the thicknesses of the metal material; And
And determining a magnetic field treatment method for a subsequent melt discharged to the cooling roll to control at least the width direction of the metal material using the measured thicknesses. The method according to claim 14,
The process of measuring the thickness of the metal material,
And measuring the center thickness in the width direction of the metal material and the edge thickness in the width direction of the metal material, respectively.
The process of determining the magnetic field processing method,
Calculating a difference value between the measured center thickness and the measured edge thickness;
Applying a magnetic field to the subsequent melt if the calculated difference value is outside a predetermined set range; And
Adjusting the strength gradient of the magnetic field applied in the longitudinal direction of the cooling roll to control the thickness of the subsequent metal material to be produced;
Metal material manufacturing method comprising a. The method according to claim 15,
The process of adjusting the thickness in the width direction of the subsequent metal material,
Metallic material manufacturing method comprising the step of adjusting the distance between both ends of the iron core of the magnetic field generating portion for applying a magnetic field in the longitudinal direction of the cooling roll. The method according to claim 16,
The process of determining the magnetic field processing method,
Calculating a difference value between the measured center thickness or the measured edge thickness and the target thickness of the metal material;
Applying a magnetic field to the subsequent melt if the calculated difference value is outside a predetermined set range; And
And adjusting the strength of the power of the magnetic field generator to adjust the longitudinal thickness of the subsequent metal material. The method according to claim 16,
The process of measuring the thickness of the metal material,
And continuously measuring the center thickness in the width direction of the metal material and the edge thickness in the width direction of the metal material,
The process of determining the magnetic field processing method,
Calculating a thickness variation that is a difference between measured center thicknesses or measured edge thicknesses;
Applying a magnetic field to the subsequent melt if the calculated amount of variation is outside a predetermined set variation range; And
And adjusting the strength of the power of the magnetic field generating unit to adjust the thickness of the subsequent metal material to be manufactured. The method of any one of claims 12, 13, 17 and 18,
The process of adjusting the longitudinal thickness of the metal material,
Method of manufacturing a metal material performed prior to the process of adjusting the width direction of the metal material. The method according to any one of claims 9 to 13 and 15 to 18,
The process of applying the magnetic field,
Method of manufacturing a metal material comprising the step of applying a static magnetic field in the longitudinal direction of the cooling roll using a DC power.

Images