KR20150020944A - Twin roll strip caster - Google Patents

Twin roll strip caster Download PDF

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Publication number
KR20150020944A
KR20150020944A KR20130098124A KR20130098124A KR20150020944A KR 20150020944 A KR20150020944 A KR 20150020944A KR 20130098124 A KR20130098124 A KR 20130098124A KR 20130098124 A KR20130098124 A KR 20130098124A KR 20150020944 A KR20150020944 A KR 20150020944A
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KR
South Korea
Prior art keywords
edge dam
sealing member
expansion
casting
sealing
Prior art date
Application number
KR20130098124A
Other languages
Korean (ko)
Inventor
정한남
권오성
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to KR20130098124A priority Critical patent/KR20150020944A/en
Publication of KR20150020944A publication Critical patent/KR20150020944A/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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/059—Mould materials or platings
    • 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
    • B22D11/08—Accessories for starting the casting procedure
    • 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

A twin roll type thin plate casting apparatus according to an embodiment of the present invention includes a pair of casting rolls which are separated and rotated while passing through a molten steel to be cast into a thin plate, an edge dam installed to close both sides of the pair of casting rolls, A sealing member provided on one surface of the edge dam in contact with the roll, the sealing member being formed of a material having a thermal expansion coefficient smaller than the thermal expansion coefficient of the sealing member and provided between the edge dam and the sealing member, .

Description

[0001] The present invention relates to a twin roll strip caster,

The present invention relates to a twin roll type thin sheet casting apparatus, and more particularly, to a twin roll thin plate casting apparatus which is provided with an expansion adjusting member having a thermal expansion coefficient smaller than that of a sealing member provided separately in an edge dam between the sealing member and the edge dam, And to prevent a gap from being generated between the sealing members due to thermal expansion.

In the twin roll thin sheet casting process, molten steel is supplied between a pair of casting rolls 10 'so that a solidifying shell is formed on the surface of the casting roll 10', and the casting rolls 10 ' So that a pair of solidified shells are coalesced into a thickness corresponding to the interval of the casting rolls 10 ', thereby continuously producing a thin cast steel.

On both sides of the casting roll 10 ', an edge dam 20' is provided in close contact so as to form a pool by confining molten steel during casting and to form a casting having a constant width. The edge dam 20 'is made of a refractory material excellent in characteristics such as heat resistance and erosion resistance so as to withstand contact with high temperature molten steel.

However, since the general refractory has a high hardness, when it is brought into close contact with the side surface of the casting roll 10 'rotating at high speed, the casting roll 10' is damaged and stable molten steel sealing can not be achieved.

Thereby, a sealing member 30 'is provided at the center of the edge dam 20', and the sealing member 30 'protects the edge dam 20' from frictional damage to the casting roll 10 ' can do.

As shown in FIG. 1A, a plurality of divided small divisional sealing members 30 'are attached to the edge dam 20' by an adhesive such as a refractory mortar to the conventional edge dam 20 ' (Japanese Patent Application Laid-Open No. 1995-068358).

The edge dam 20 'is typically heated to about 1000 ° C or more during preheating and casting, and during the casting, the molten steel of high temperature is brought into contact with the center of the movable surface, resulting in a moving surface temperature of about 1400 ° C or more.

On the other hand, the sealing members 30 'are brought into contact with the molten steel at a part of the surface thereof, but coincide with the side surface of the casting roll 10' being cooled at the same time. .

Accordingly, the edge dam 20 'and the sealing member 30' exhibit different temperature distributions, and the thermal expansion amount of the edge dam 20 'is relatively large.

Also, depending on the position of the edge dam 20 ', there is a difference in the amount of thermal expansion during casting. That is, the amount of thermal expansion decreases toward the bottom of the edge dam 20 ', and the amount of thermal expansion increases toward the vicinity of the molten steel bath surface.

As described above, the total thermal expansion amount of the edge dam 20 'is greatly increased and the amount of deformation is large, while the thermal expansion amount of the sealing member 30' assembled to the edge dam 20 'is much smaller.

As a result, a gap g is generated between the sealing members 30 'divided and assembled into the edge dam 20' as shown in FIG. 1 (b).

In such a gap g, molten steel gradually permeates during casting, and in the worst case, the molten steel is infiltrated to the contact surface of the casting roll 10 'to hinder the sealing of the molten steel to break the molten steel outflow or the sealing member 30' Resulting in a problem causing interruption.

In order to solve such a problem, conventionally, an integral sealing member 30 'is assembled to the edge dam 20' as shown in FIG. 2 (a), or only the integral sealing member 30 'is applied. (International Patent Publication WO1996-000626)

However, in the above-described prior art, in the edge dam 20 'applied to a large-sized thin plate casting machine in which the diameter of the casting roll 10' is larger than about 800 mm and the height of the spool is about 300 mm or more, (B), as shown in Fig. 2 (b), and the molten steel flow is more severely damaged due to the occurrence of cracks C as shown in Fig. 2 (b) The problem is that it causes problems.

Therefore, research on a twin roll type thin sheet casting apparatus for solving the above-mentioned problems is required.

It is an object of the present invention to provide a twin roll type thin plate casting apparatus which prevents a gap between the edge dams from being generated due to a difference in thermal expansion amount between a sealing member and an edge dam.

A twin roll type thin plate casting apparatus according to an embodiment of the present invention includes a pair of casting rolls which are separated and rotated while passing through a molten steel to be cast into a thin plate, an edge dam installed to close both sides of the pair of casting rolls, A sealing member provided on one surface of the edge dam in contact with the roll, the sealing member being formed of a material having a thermal expansion coefficient smaller than the thermal expansion coefficient of the sealing member and provided between the edge dam and the sealing member, .

Further, the expansion control member of the twin roll type thin plate casting apparatus according to an embodiment of the present invention may be formed of a material having a coefficient of thermal expansion smaller than the thermal expansion coefficient of the edge dam.

Further, the edge dam of the twin roll type thin plate casting apparatus according to an embodiment of the present invention is formed of a material in which at least one of alumina, mullite, spinel, zirconia and magnesia is mixed with silicon carbide and graphite, and the sealing member is made of zirconia , Silicon nitride, aluminum nitride, alon, sialon, and boron nitride, and the expansion control member may be formed of one of fused silica, cordierite, and aluminum titanate.

Further, the edge dam of the twin roll type thin plate casting apparatus according to the embodiment of the present invention is provided with a mother seating groove in which the expansion control member is accommodated, and the sealing member is provided on the one side It is possible to provide a self-holding groove having a shape with one side opened so as to be accommodated in a side-by-side manner.

Further, the thickness of the expansion control member of the twin roll type thin plate casting apparatus according to an embodiment of the present invention may be provided in a range of 15 to 25 mm.

Further, the expansion adjustment member of the twin roll type thin plate casting apparatus according to an embodiment of the present invention can provide a boundary contact surface that abuts a boundary portion between the divided sealing members.

In addition, the expansion control member of the twin roll type thin sheet casting apparatus according to an embodiment of the present invention may be formed integrally with one member.

Further, the expansion adjusting member of the twin roll type thin plate casting apparatus according to an embodiment of the present invention may be divided into a plurality of unit adjusting members which provide the boundary contact surface for each boundary portion between the divided sealing members.

The twin roll type thin plate casting apparatus of the present invention is characterized in that an expansion control member having a thermal expansion coefficient smaller than that of the sealing member is provided between the sealing member and the edge dam so that the sealing member and the edge dam, There arises an effect that a gap can be prevented from occurring between the members.

As a result, there is an advantage in that molten steel can be prevented from leaking between the gaps, and there is an advantage that the sealing member can be prevented from being broken by penetration of molten steel into the gap.

Further, the casting can be continuously performed without damaging the apparatus, and the productivity of the casting can be improved.

1 and 2 are views showing a conventional edge dam and a sealing member.
3 is a perspective view showing the twin roll type thin plate casting apparatus of the present invention.
4 is a front view showing the twin roll type thin plate casting apparatus of the present invention.
5 is a sectional view taken along the line AA in Fig.
6 is a sectional view taken along the line BB in Fig.
7 is a front view showing the expansion control member in the twin roll type thin sheet casting apparatus of the present invention.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

The twin roll type thin sheet casting apparatus 1 according to the present invention is characterized in that the expansion control member 40 having a thermal expansion coefficient smaller than that of the sealing member 30 provided to the edge dam 20 is divided into the sealing member 30 and the edge dam 20 to prevent a gap (g) between the sealing members (30) from being generated due to thermal expansion of the edge dam (20).

The sealing member 30 and the edge dam 20 are provided with the expansion control member 40 having the thermal expansion coefficient smaller than that of the sealing member 30 between the sealing member 30 and the edge dam 20, It is possible to prevent the gap g from being generated between the sealing members 30 divided by the difference in the thermal expansion amounts of the sealing members 30.

As a result, it is possible to prevent the molten steel (1) from leaking through the gap (g), and to prevent the sealing member (30) from being broken by the penetration of the molten steel (1).

3 is a perspective view showing the twin roll type thin plate casting apparatus 1 of the present invention, and Fig. 4 is a front view showing the twin roll type thin plate casting apparatus 1 of the present invention.

3 and 4, a twin roll type thin sheet casting apparatus 1 according to an embodiment of the present invention includes a pair of casting rolls 10 that are rotated and rotated while passing through molten steel 1 to be cast into a thin plate, An edge dam 20 installed so as to block both sides between the pair of casting rolls 10 and a sealing member 30 divided into a plurality of parts at one side of the edge dam 20 contacting with the casting roll 10 And an expansion control member 40 formed of a material having a thermal expansion coefficient smaller than the thermal expansion coefficient of the sealing member 30 and provided between the edge dam 20 and the sealing member 30.

The expansion control member 40 of the twin roll type thin plate casting apparatus 1 according to the embodiment of the present invention may be formed of a material having a coefficient of thermal expansion smaller than the thermal expansion coefficient of the edge dam 20.

The edge dam 20 of the twin roll type thin sheet casting apparatus 1 according to the embodiment of the present invention is formed of a material in which at least one of alumina, mullite, spinel, zirconia, and magnesia is mixed with silicon carbide and graphite , The sealing member 30 is formed of a material in which boron nitride is mixed with at least one of zirconia, silicon nitride, aluminum nitride, alon, and sialon, and the expansion control member 40 is made of fused silica, cordierite, aluminum titanate As shown in FIG.

The pair of casting rolls 10 are provided so that when the molten steel 1 is supplied between the pair of casting rolls 10 through the immersion nozzle 3 attached to the tundish in the twin roll type thin plate casting process, (1) and to produce the slab (2).

The molten steel (1), which is in contact with the casting roll (10), forms a solidifying cell on the surface of the casting roll (10) while depriving the heat of the molten steel The thus formed solidification shell can be formed by forming a thin plate by a pair of casting rolls 10 rotating in opposite directions.

The edge dam 20 may be provided on both sides of the pair of casting rolls 10 to form the casting roll 10 and the spooling roll. That is, a pair of the casting rolls 10 prevent the molten steel 1 from being separated at both ends, and the edge dam 20 is provided on both sides other than both ends where the casting roll 10 is provided So that it is possible to form a spool.

However, the edge dam 20 is made of a material in which at least one of alumina, mullite, spinel, zirconia, and magnesia is mixed with silicon carbide, graphite or the like as a refractory, and a frame made of heat resistant steel is used for restraining the refractory Can be provided.

In this way, when the edge dam 20 is in contact with the casting roll 10, the molten steel 1 can be separated from the casting roll 10 due to, for example, A sealing member 30 may be provided between the edge dam 20 and the casting roll 10.

The sealing member 30 and the edge dam 20 may have a difference in thermal expansion amount during the casting process and a gap g may be generated between the sealing members 30, In order to prevent this, an expansion regulating member 40 may further be provided between the sealing member 30 and the edge dam 20.

In addition, the edge dam 20 may be provided with a mount recess 21 in which the expansion control member 40 can be seated. A detailed description thereof will be given later with reference to Fig.

The sealing member 30 serves to seal between the edge dam 20 and the casting roll 10. For this purpose, the sealing member 30 is a dense sintered body in which boron nitride is mixed with an oxide or a nitride, and can be formed of a material having corrosion resistance and mechanical strength to the molten steel 1 and suitable lubrication characteristics.

That is, the sealing member 30 is preferably formed of boron nitride (BN) based composite ceramics having self-lubrication properties to protect the casting roll 10 from friction damage as well as heat resistance and corrosion resistance.

For example, the sealing member 30 may be formed of a material in which at least one of zirconia, silicon nitride, aluminum nitride, alon, and sialon is mixed with boron nitride.

The seal member 30 is provided in the recessed groove 41 of the expansion control member 40 provided between the edge dam 20 and the sealing member 30 so as to be provided in the edge dam 20, Which will be described in detail later with reference to FIG.

Meanwhile, in order for the sealing member 30 to be coupled to the expansion control member 40, a refractory mortar may be applied to the sealing member 30 to join the sealing member 30. Particularly, in order to engage with the self-seating groove 41, the refractory mortar can be attached to the lower surface and one side surface of the sealing member 30 to be combined.

The expansion regulating member 40 can prevent the gap g from being generated between the sealing members 30 divided by the difference in the amount of thermal expansion between the edge dam 20 and the sealing member 30 It can play a role to prevent.

The expansion regulating member 40 may be provided between the edge dam 20 and the sealing member 30 and may have a thermal expansion coefficient smaller than that of the sealing member 30. [

The material of the expansion regulating member 40 may be provided as one of fused silica, cordierite, and aluminum titanate as an example.

Even if the same amount of heat is applied to the expansion regulating member 40 and the sealing member 30 as a material of the expansion regulating member 40 having a smaller thermal expansion coefficient than the material of the sealing member 30 described above, The thermal expansion coefficient of the expansion regulating member 40 is smaller than that of the sealing member 30.

That is, since the divided sealing members 30 are coupled to the expansion regulating member 40, when the expansion regulating member 40 has less thermal expansion than the sealing member 30, the sealing member 30 G " may not be generated between the electrodes.

On the other hand, since the edge dam 20 to which the expansion regulating member 40 is coupled has a large contact area with the molten steel 1, the amount of thermal expansion becomes larger than that of the sealing member 30. If the divided sealing members 30 are directly coupled to the edge dam 20, since the volume of the edge dam 20 to expand is larger than the volume of the sealing member 30 to expand, A gap g is generated between the sealing members 30. [

However, in the present invention, since the sealing member 30 is coupled to the expansion control member 40, such a problem does not occur.

The expansion regulating member 40 may be formed of a material having a thermal expansion coefficient smaller than that of the edge dam 20 in addition to using a material having a thermal expansion coefficient smaller than that of the sealing member 30. [ That is, the expansion regulating member 40 can be formed of a material having a thermal expansion coefficient smaller than that of the sealing member 30 and the edge dam 20, and can be provided.

According to this, even when the edge dam 20 is thermally expanded by the heat transmitted from the molten steel 1 or the like, the divided sealing members 30 are not coupled to the edge dam 20, 40, the sealing member 30 is not affected even if the edge dam 20 further thermally expands more than the sealing member 30.

That is, even though the expansion regulating member 40 is provided with the same amount of heat as the edge dam 20, the expansion regulating member 40 has a smaller volume expansion than the edge dam 20, The gap g may not be formed because the divided sealing members 30 provided to be coupled to the sealing member 30 are separated from each other.

On the other hand, the expansion regulating member 40 may have a boundary contact surface 42 that is in contact with a boundary portion between the divided sealing members 30, and may be provided while being divided with the boundary contact surface 42 Or may be integrally formed and provided. A detailed description thereof will be given later with reference to Fig.

In order to couple the expansion control member 40 to the edge dam 20, a surface of the expansion control member 40, which contacts the edge dam 20, .

That is, since the mortar provided at a thickness of about 2 mm has a low bonding force at a high temperature, it is possible to prevent warpage or the like caused by a difference in thermal expansion amount between the edge dam 20 and the expansion control member 40 in a high- The problem can be prevented.

4, the edge dam 20 of the twin roll type thin sheet casting apparatus 1 according to the embodiment of the present invention is provided with the expansion control member 40, And the expansion control member 40 is provided with a recessed groove 21 in which the one side of the sealing member 30 is in contact with the edge dam 20, (41) may be formed and provided.

That is, in order for the expansion regulating member 40 to be provided between the edge dam 20 and the sealing member 30, the edge dam 20 is formed with a mount receiving groove 21, (41) can be formed on the base (40).

The mount receiving groove 21 may be formed in the edge dam 20 to accommodate the inflation adjusting member 40. For this purpose, the mount receiving groove 21 may be formed in a shape corresponding to the outer surface of the inflation adjusting member 40. For example, the side surface and the bottom surface of the expansion control member 40 may be formed to be in contact with each other except for the upper surface.

The self-seating groove 41 may be formed to receive the sealing member 30 in the expansion control member 40. For this, the self-seating groove 41 may be formed in a shape corresponding to the outer surface of the sealing member 30. [

Particularly, in order to accommodate the sealing member 30 so that the sealing member 30 is in contact with the one surface portion of the edge dam 20, one side portion may be formed in an open shape. That is, the magnetic receiving grooves 41 can be provided in a shape of "└" or a shape of "┘" in cross section.

Fig. 6 is a sectional view taken along the line BB in Fig. 4, in which the thickness t of the expansion regulating member 40 of the twin roll type sheet casting apparatus 1 according to the embodiment of the present invention is 15 to 25 mm .

When the thickness t of the expansion control member 40 is less than 15 mm, the expansion regulating member 40 is configured to restrict the thickness of the edge dam When the thickness t of the expansion control member 40 exceeds 25 mm, the thickness of the expansion damper 20 is excessively thick, and the edge dam 20, the sealing member 20, 30), and the total thickness including the expansion regulating member 40 is increased, which is undesirable.

7 is a front view showing the expansion regulating member 40 in the twin roll type thin sheet casting apparatus 1 of the present invention. Fig. 7 (a) is a front view showing the expansion regulating member 40 divided into two unit regulating members 43 7 (b) is a cross-sectional view of the CC portion in FIG. 7 (a), and FIG. 7 (c) is an enlarged view of the D portion in FIG. 7 (a) .

7, the expansion regulating member 40 of the twin roll type sheet casting apparatus 1 according to the embodiment of the present invention includes a boundary contact surface 42 which abuts a boundary portion between the divided sealing members 30, Can be provided.

Further, the expansion control member 40 of the twin roll type sheet casting apparatus 1 according to an embodiment of the present invention may be formed integrally with one member.

The expansion regulating member 40 of the twin roll type sheet casting apparatus 1 according to an embodiment of the present invention is also provided with a plurality of sealing members 30, The unit adjusting member 43 may be provided separately.

That is, it is possible to provide a surface that is in contact with a boundary portion between the sealing members 30 that are provided in a divided manner, so that even if a gap g occurs in a boundary portion between the sealing members 30, .

As such, providing the boundary contact surface 42 that is in contact with the boundary portion between the sealing members 30, the expansion regulating member 40 can be integrally provided as one member as a whole, The unit controlling member 43 may be provided as an aggregate of the unit adjusting members 43.

Even if the unit adjusting member 43 is divided and provided, it is preferable that the unit adjusting member 43 is coupled to the edge dam 20 without a gap between the unit adjusting members 43. However, It is preferable that the unit control members 43 are coupled to each other.

When the expansion control member 40 is divided and provided by a plurality of unit control members 43, the expansion control member 40 provided to the edge dam 20 is provided to the edge dam 20 It is possible to prevent such a problem that a crack is generated due to a difference in the amount of thermal expansion.

1: twin roll thin plate casting device 2:
3: immersion nozzle 10: casting roll
20: edge dam 21:
30: sealing member 40: expansion adjusting member
41: Self-seating groove 42: Boundary contact surface
43:

Claims (8)

A pair of casting rolls spaced apart and rotated while passing through molten steel to be cast into a thin plate;
An edge dam installed to close both sides of the pair of casting rolls;
A sealing member divided into a plurality of portions on one side of the edge dam in contact with the casting roll; And
An expansion control member formed of a material having a thermal expansion coefficient smaller than that of the sealing member and provided between the edge dam and the sealing member;
And a pair of rolls. The method according to claim 1,
Wherein the expansion control member is formed of a material having a thermal expansion coefficient smaller than a thermal expansion coefficient of the edge dam and is provided. 3. The method of claim 2,
Wherein the edge dam is formed of a material in which at least one of alumina, mullite, spinel, zirconia, and magnesia is mixed with silicon carbide and graphite,
Wherein the sealing member is formed of a material in which at least one of zirconia, silicon nitride, aluminum nitride, alon, and sialon is mixed with boron nitride,
Wherein the expansion control member is formed of one of fused silica, cordierite, and aluminum titanate. 3. The method according to claim 1 or 2,
Wherein the edge dam is provided with a mother seating groove in which the expansion control member is accommodated,
Wherein the expansion control member is provided with a self-seating groove having a shape in which one side is open so that the sealing member is received in contact with one side of the edge dam. 3. The method according to claim 1 or 2,
Wherein the thickness of the expansion control member is 15 to 25 mm. 3. The method according to claim 1 or 2,
The expansion regulating member includes a boundary contact surface abutting a boundary portion between the sealing members divided;
Wherein the biaxially stretched foil is a biaxially stretched foil. The method according to claim 6,
Wherein the expansion control member is formed integrally with a single member. The method according to claim 6,
Wherein the expansion adjusting member comprises: a plurality of unit adjusting members for providing the boundary contact surface for each of the boundary portions between the sealing members divided;
Wherein the biaxially stretched laminated sheet casting apparatus comprises:
KR20130098124A 2013-08-19 2013-08-19 Twin roll strip caster KR20150020944A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106964762A (en) * 2015-12-21 2017-07-21 Posco公司 The edge guard of double-roll type thin plate casting machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106964762A (en) * 2015-12-21 2017-07-21 Posco公司 The edge guard of double-roll type thin plate casting machine
US9815110B2 (en) 2015-12-21 2017-11-14 Posco Edge dam of twin roll type strip caster

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