KR101753071B1 - Strip Casting Apparatus - Google Patents

Strip Casting Apparatus Download PDF

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Publication number
KR101753071B1
KR101753071B1 KR1020150143964A KR20150143964A KR101753071B1 KR 101753071 B1 KR101753071 B1 KR 101753071B1 KR 1020150143964 A KR1020150143964 A KR 1020150143964A KR 20150143964 A KR20150143964 A KR 20150143964A KR 101753071 B1 KR101753071 B1 KR 101753071B1
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KR
South Korea
Prior art keywords
strip
cooling
tray
cooling tray
crusher
Prior art date
Application number
KR1020150143964A
Other languages
Korean (ko)
Other versions
KR20170044366A (en
Inventor
임경묵
박승연
김진호
김범성
김택수
박경태
Original Assignee
한국생산기술연구원
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Priority to KR1020150143964A priority Critical patent/KR101753071B1/en
Publication of KR20170044366A publication Critical patent/KR20170044366A/en
Application granted granted Critical
Publication of KR101753071B1 publication Critical patent/KR101753071B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0611—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a single casting wheel, e.g. for casting amorphous metal strips or wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting

Abstract

The present invention relates to a strip casting apparatus. One aspect of a strip casting apparatus according to an embodiment of the present invention is a strip casting apparatus that is installed inside a melting chamber so as to be rotatable about a rotational axis in a horizontal direction and is made of a molten metal melted and dropped in a melting crucible A cooling roller which is contacted and primarily cooled; A cooling tray installed inside the cooling chamber so as to be rotatable about a vertical rotation axis, wherein the strip cooled down by the cooling roller comes into contact with the inner surface of the cooling tray and is secondarily cooled; A strip crusher installed inside the cooling chamber corresponding to the upper side of the cooling tray so as to be rotatable about the same rotation axis as the cooling tray and for crushing the strip falling inside the cooling tray; A first motor for providing a driving force for rotation of the cooling tray; A second motor for providing a driving force for rotation of the strip crushing unit; And a control unit for controlling operations of the first and second motors to adjust a difference between a rotation speed of the cooling tray and a rotation speed of the cooling tray and the strip crushing unit. .

Description

[0001] STRIP CASTING APPARATUS [0002]

The present invention relates to a strip casting apparatus.

The strip casting apparatus cools the molten parent alloy during the manufacture of the rare-earth permanent magnets to produce strips in the form of flakes. However, since the microcrystalline structure is determined according to the cooling rate of the strip, a strip casting device capable of reducing variations in the cooling rate of the strip is required. Generally, in a strip casting apparatus, a molten alloy melted in a molten crucible is cooled by being contacted with an outer circumferential surface of a cooling roller rotating around a rotational axis in a horizontal direction, So that a strip is produced. In such a conventional technique, a strip falling on the upper surface of the cooling disk is loaded, so that some of the strips do not sufficiently contact the cooling disk, so that the cooling speed of the strip may be varied.

Prior Art Document 1 (Korean Patent Laid-Open Publication No. 2010-0137859) and Prior Art Document 2 (Korean Patent Publication No. 1353771) disclose a strip casting apparatus for solving the problems of the prior art. In the case of the prior art document 1, the strip is moved along the cooling cylinder 23 rotating around the rotational axis in the horizontal direction, so that the cooling rate of the strip is controlled, and inert gas or the like is further introduced into the cooling cylinder 23 And is supplied as cooling gas. In the case of the prior art document 2, the strip is cooled and comes into contact with the upper surface of the cooling plate 64, which is located inside the cooling chamber 62 and into which the cooling water flows, So that the strips are prevented from being fused to each other by the agitating portion 60.

However, in the case of the prior art document 1, since the length of the cooling cylinder 23 must be secured for sufficient cooling of the strip, there is a disadvantage that the size of the apparatus is increased. In the case of the prior art document 2, even if the rotary vane 62 rotates, when the strip falls down on a part of the cooling plate 64, there is a possibility that the strip is fused. In particular, when the rotary vane 62 Since it only acts to stir the strip, there is a disadvantage that it can not actively intervene to cool the strip.

Korean Patent Publication No. 2010-0137859 (name: strip casting device) Korean Registered Patent No. 1353771 (name: strip casting device)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a strip casting apparatus capable of producing a strip of uniform microcrystalline structure with a simpler structure.

According to an aspect of the present invention, there is provided a strip casting apparatus including a melting chamber, a melting chamber for melting a molten metal in a melting crucible to produce a strip, A cooling roller in which the falling molten metal comes into contact with its surface and is primarily cooled; A cooling tray installed inside the cooling chamber so as to be rotatable about a vertical rotation axis, wherein the strip cooled down by the cooling roller comes into contact with the inner surface of the cooling tray and is secondarily cooled; A strip crusher installed inside the cooling chamber corresponding to the upper side of the cooling tray so as to be rotatable about the same rotation axis as the cooling tray and for crushing the strip falling inside the cooling tray; A first motor for providing a driving force for rotation of the cooling tray; A second motor for providing a driving force for rotation of the strip crushing unit; And a control unit for controlling operations of the first and second motors to adjust a difference between a rotation speed of the cooling tray and a rotation speed of the cooling tray and the strip crushing unit. .

In an aspect of the embodiment of the present invention, the control section controls the operation of the first and second motors such that the strip pulverizing section rotates at a relatively high speed relative to the cooling tray.

In one aspect of the embodiment of the present invention, the strip crushing section includes: a hub located above the cooling tray and connected to the second motor; And a plurality of blades extending from an outer circumferential surface of the hub and crushing the strip dropped inside the cooling tray; .

In one aspect of the embodiment of the present invention, the blades are formed in a straight line and extend radially so as to be spaced apart from each other by a predetermined central angle on the outer peripheral surface of the hub.

In one aspect of the embodiment of the present invention, the strip crushing section is provided so as to be capable of adjusting the distance between the inside of the cooling tray and the lower end of the blade.

In an aspect of an embodiment of the present invention, a gas supply unit for supplying a cooling gas into the inside of the cooling chamber; And at least one injection nozzle for injecting the cooling gas supplied by the gas supply unit into the interior of the cooling chamber; .

In an aspect of the embodiment of the present invention, the injection nozzle is disposed in at least one of the cooling tray or the strip crushing section.

According to the strip casting apparatus of the embodiment of the present invention, the following effects can be expected.

First, in the embodiment of the present invention, the cooling tray and the crushing section of the strip are rotated, thereby preventing mutual fusion of the strip falling inside the cooling tray. Therefore, according to the embodiment of the present invention, the deviation of the cooling rate of the strip is reduced, thereby making it possible to produce a strip of uniform microcrystalline structure.

Further, in the embodiment of the present invention, the strip dropped inside the cooling tray is crushed by the strip crushing portion. Therefore, according to the embodiment of the present invention, it is possible to rapidly cool the pulverized strip to a relatively small size.

In addition, in the embodiment of the present invention, the size of the strip to be crushed is adjusted according to the adjustment of the rotation speed difference of the cooling tray and the strip crushing section or the adjustment of the distance between the inside of the cooling tray and the strip crushing section, Can be adjusted. Thus, according to embodiments of the present invention, the cooling rate of the strip can be adjusted so that the microcrystalline structure of the strip satisfies the required conditions.

1 is a schematic view showing a strip casting apparatus according to an embodiment of the present invention.
2 is a cross-sectional view conceptually showing an embodiment of the present invention;
3 is a plan view showing a main part of an embodiment of the present invention.
FIG. 4 is a photograph showing the determination of the strip produced according to the embodiment of the present invention and the strip produced by the conventional technique. FIG.

Hereinafter, a strip casting apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing a strip casting apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view conceptually showing an embodiment of the present invention, FIG. 3 is a plan view showing a main part of an embodiment of the present invention, FIG. 4 is a photograph showing the determination of the strip formed according to the embodiment of the present invention and the strip produced by the conventional technique. FIG.

1 to 3, the strip casting apparatus according to the present embodiment includes a cooling roller 100, a cooling tray 200, a strip crusher 300, first and second motors 400 and 500 A strip tray 600, a gas supply unit 600, at least one injection nozzle 700, and a control unit 800.

More specifically, the cooling roller 100 is installed inside the melting chamber 1 so as to be rotatable about a horizontal rotation axis. In the cooling roller 100, the molten metal melted in the melting crucible 10 and falling is brought into contact with the surface of the molten metal to perform primary cooling. Although not shown, the cooling roller 100 will rotate by a driving force provided by a driving source such as a motor.

The cooling tray 200 is installed inside the cooling chamber 2 communicating with the melting chamber 1 so as to be rotatable about a vertical rotation axis. The cooling tray 200 may be formed in a cylindrical shape having a predetermined diameter, for example. In the cooling tray 200, a strip cooled down by the cooling roller 100 is dropped into contact with the inner surface of the strip.

The strip crusher 300 is installed inside the cooling chamber 2 so as to be rotatable about the rotation axis in the same horizontal direction as the cooling tray 200. At this time, the strip crusher 300 is located above the cooling tray 200. The strip crusher 300 crushes a strip falling inside the cooling tray 200.

In this embodiment, the strip crusher 300 includes a hub 310 and a plurality of blades 320. The hub 310 is located above the cooling tray 200 and is connected to the second motor 500. The blades 320 are formed in a straight line and extend radially so as to be spaced from each other by a predetermined central angle on the outer circumferential surface of the hub 310. Particularly, in this embodiment, the strip crusher 300 is installed to adjust the distance between the inside of the cooling tray 200 and the lower end of the blade 320. Therefore, it is possible to substantially control the size of the strip to be crushed by the strip crushing unit 300.

The first and second motors 400 and 500 provide a driving force for rotation of the cooling tray 200 and the strip crusher 300, respectively.

Meanwhile, the gas supply unit 600 serves to supply the cooling gas into the cooling chamber 2. The gas supply unit 600 can supply a cooling gas such as an inert gas to the inside of the cooling chamber 2, for example.

The injection nozzle 700 injects the cooling gas supplied from the gas supply unit 600 into the interior of the cooling chamber 2. In the present embodiment, the injection nozzle 700 is disposed in at least one of the cooling tray 200 and the strip crusher 300. Therefore, in this embodiment, the cooling gas injected from the injection nozzle 700 and the strip dropped inside the cooling tray 200 can be more efficiently contacted.

The controller 800 controls operations of the first and second motors 400 and 500 and the gas supplier 600. Particularly, in the present embodiment, the controller 800 controls the first and second motors 400 and 500 so that the strip crusher 300 rotates relatively faster than the cooling tray 200, And controls the operation. Therefore, even if the cooling tray 200 rotates, the strip dropped inside the cooling tray 200 can be crushed by the rotation of the strip crusher 300.

The control unit 800 may control the amount of strips or strips falling on the inside of the cooling tray 200 according to the length of time the strips contact the inside of the cooling tray 200 500). For example, the controller 800 controls the operation of the first motor 400 so that the rotation speed of the cooling tray 200 is increased in proportion to the amount of the strip dropped inside the cooling tray 200 Can be controlled. This is to minimize the drop of the strip at the overlapping position by increasing the rotational speed of the cooling tray 200 when a relatively large number of strips fall into the cooling tray 200. [ The controller 800 controls the first and second motors 400 and 500 so that the difference between the rotation speed of the cooling tray 200 and the rotation speed of the strip crusher 300 is inversely proportional to the size of the strip to be crushed. Can be controlled. This is to substantially control the cooling time of the strip determined by the size of the strip to be crushed by the strip crusher 300. In other words, when the strip is crushed to a relatively large size, that is, when the cooling time of the strip is relatively increased, the controller 800 controls the rotation speed of the cooling tray 200 and the strip crusher 300 The operation of the first and second motors 400 and 500 may be controlled so that the difference between the first and second motors 400 and 500 is reduced. In contrast, when the strip is crushed to a relatively small size, that is, when the cooling time of the strip is relatively reduced, the controller 800 controls the rotation speed of the cooling tray 200 and the strip crusher 300 The operation of the first and second motors 400 and 500 may be controlled to increase the difference.

In general, the crystal structure of strips of rare metals used in permanent magnets is required to have a dendrite spacing of about 3 mu m and a certain directionality. However, when the strip is cooled with mutual fusion of the strip and the relatively large size, the cooling time of the strip is increased, thereby failing to secure the required dendrite spacing or directionality. On the contrary, in this embodiment, the cooling rate of the cooling tray 200 is changed according to the amount of the strip so that the strip cooled by the cooling roller 100 is not dropped to the position where the strip is superimposed on the inside of the cooling tray 200 And is pulverized by the strip crusher 300, so that dendritic spacing required by rapid cooling of the strip can be achieved.

Therefore, as shown in the left side of FIG. 4, the crystal structure of the strip produced by the prior art shows not only a dendritic gap of about 5 to 10 μm, but also a directionality is not constant. However, according to this embodiment, as shown in the right side of Fig. 4, it is possible to produce strips having a resin-like spacing of about 3 占 퐉 and a certain directional microcrystalline structure.

In this embodiment, by adjusting the distance between the cooling tray 200 and the strip crusher 300 or adjusting the difference in the rotational speed of the cooling tray 200 and the strip crusher 300, The cooling rate can be adjusted. Thus, the cooling rate of the strip can be adjusted so that the microcrystalline structure of the strip substantially satisfies the required conditions.

It is to be understood that the scope of the present invention is defined by the appended claims rather than by the embodiments described above and that various modifications and alterations made by those skilled in the art It is obvious that it can be done.

1: melting chamber 2: cooling chamber
10: Melting crucible 100: Cooling roller
200: cooling tray 300: strip crushing part
310: hub 320: blade
400: first motor 500: second motor
600: gas supply part 700: injection nozzle
800:

Claims (7)

A cooling roller (1) is provided inside the melting chamber (1) so as to be rotatable about a rotational axis in the horizontal direction, and a molten metal melted in the melting crucible (10) 100);
A cooling tray 200 installed inside the cooling chamber 2 so as to be rotatable around a rotation axis in a vertical direction and being primarily cooled by the cooling roller 100 to come into contact with the upper surface of the cooling tray 200, ;
The cooling tray 200 is installed inside the cooling chamber 2 so as to be spaced apart from the upper surface of the cooling tray 200 and rotatable about the same rotation axis as the cooling tray 200, A strip grinding unit 300 for grinding a strip;
A first motor (400) for providing a driving force for rotation of the cooling tray (200);
A second motor (500) for providing a driving force for rotation of the strip crusher (300); And
A controller 800 for controlling the operation of the first and second motors 400 and 500 so that the cooling tray 200 and the strip crusher 300 rotate at different speeds; .
The method according to claim 1,
The controller 800 controls the second motor (not shown) so that the rotating speed of the strip crusher 300 is increased or decreased according to the amount of strip to be dropped by the cooling roller 100 and the size of the strip to be crushed. 500 to control the operation of the first and second motors 400, 500 so that the difference in rotational speed between the cooling tray 200 and the strip crusher 300 is controlled.
The method according to claim 1,
The strip crushing unit 300 may be formed of,
A hub 310 located above the cooling tray 200 and connected to the second motor 500; And
A plurality of blades (320) extending from an outer circumferential surface of the hub (310) and crushing a strip dropped inside the cooling tray (200); .
The method of claim 3,
Wherein the blades (320) are formed in a straight line and extend radially so as to be spaced from each other by a predetermined central angle on the outer peripheral surface of the hub (310).
The method of claim 3,
Wherein the strip milling unit 300 is installed to adjust the distance between the inside of the cooling tray 200 and the lower end of the blade 320.
6. The method according to any one of claims 1 to 5,
A gas supply unit 600 for supplying a cooling gas into the cooling chamber 2; And
And at least one injection nozzle disposed in at least one of the cooling tray 200 and the strip crusher 300 for injecting the cooling gas supplied by the gas supply unit 600 into the cooling chamber 2, (700); Further comprising:
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KR1020150143964A 2015-10-15 2015-10-15 Strip Casting Apparatus KR101753071B1 (en)

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Application Number Priority Date Filing Date Title
KR1020150143964A KR101753071B1 (en) 2015-10-15 2015-10-15 Strip Casting Apparatus

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KR20170044366A KR20170044366A (en) 2017-04-25
KR101753071B1 true KR101753071B1 (en) 2017-07-04

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006341294A (en) * 2005-06-10 2006-12-21 Ulvac Japan Ltd Cooling accelerating mechanism of vacuum melting and casting apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006341294A (en) * 2005-06-10 2006-12-21 Ulvac Japan Ltd Cooling accelerating mechanism of vacuum melting and casting apparatus

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