KR101273962B1 - Edge dam for twin roll type strip caster - Google Patents

Edge dam for twin roll type strip caster Download PDF

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Publication number
KR101273962B1
KR101273962B1 KR20100131933A KR20100131933A KR101273962B1 KR 101273962 B1 KR101273962 B1 KR 101273962B1 KR 20100131933 A KR20100131933 A KR 20100131933A KR 20100131933 A KR20100131933 A KR 20100131933A KR 101273962 B1 KR101273962 B1 KR 101273962B1
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South Korea
Prior art keywords
patching
sealing plate
base
refractory material
edge dam
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KR20100131933A
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Korean (ko)
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KR20120070395A (en
Inventor
정한남
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재단법인 포항산업과학연구원
주식회사 포스코
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Priority to KR20100131933A priority Critical patent/KR101273962B1/en
Publication of KR20120070395A publication Critical patent/KR20120070395A/en
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  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

The present invention is an edge dam installed on both sides of the casting rolls, in order to trap the molten steel between a pair of casting rolls. A base refractory material forming an overall shape of the edge dam and positioned on a side of the casting roll; A sealing plate inserted into the base refractory material along a portion of an edge of the casting roll side and in close contact with the casting roll side to seal the molten steel; An attachment material for attaching the sealing plate to the ground fireproof material; And a patching material inserted into and attached along a boundary between the base fireproof material and the sealing plate. The edge roll for the twin roll sheet caster as described above prevents penetration of molten steel between the base refractory material and the sealing plate, and provides a stable casting operation.

Description

Edge roll for twin roll sheet casting machine {EDGE DAM FOR TWIN ROLL TYPE STRIP CASTER}

The present invention relates to an edge dam for a double roll type sheet casting machine that is in close contact with a side portion of a pair of casting rolls to prevent the outflow of molten steel supplied between the pair of casting rolls. The present invention relates to an edge dam for a twin roll sheet caster capable of preventing a solidified body of molten steel from being attached therebetween.

Twin roll sheet casters are used to produce thin casts. 1 is a view showing a state in which the edge dam 10 is used in a twin-roll sheet caster. As shown in FIG. 1, a continuous casting process of a thin plate using a twin-roll type sheet casting machine supplies molten steel to a molten steel supply nozzle 1 between a pair of casting rolls R and R ′ and cast rolls R , The solidification cell of constant thickness formed on the surface of each of the structural rolls by rotating R ') is coalesced in the vicinity of the closest contact point of the casting rolls R and R' and thinned according to the spacing of the casting rolls R and R '. It is a method of continuously manufacturing cast steel (S).

On both sides of the casting rolls (R, R '), the edge dam 10 is in close contact with each other to form the molten steel pool (2) during casting and to form the cast (S) with a constant width. 2 is a plan view showing the edge dam 10 according to the prior art and a cross-sectional view showing a state cut along the line A-A.

Edge dam 10 is composed of a refractory material in order to take a high temperature molten steel during casting, and in general, the plate is composed of refractory materials such as alumina, mullite, zirconia, silica, silicon carbide, etc., which have excellent properties such as heat resistance and erosion resistance. It is manufactured in the form. In general, since the refractory material has a high hardness, the refractories may cause damage to the casting rolls R and R 'when they are in close contact with the casting rolls R and R' that rotate at high speed, and thus fail to form a stable molten steel. For this reason, the sealing plate 12 is formed in the friction surface which directly contacts the side surfaces of the casting rolls R and R 'in the plate-shaped base fireproof material 11.

The sealing plate 12 is a material having appropriate hardness and machinability. As a result, the sealing plate 102 may be appropriately worn by the rotating casting rolls R and R ', thereby protecting the casting rolls R and R' and improving molten steel sealing property. In addition, the sealing plate 12 is assembled to the base refractory material 11 using an adhesive 13 such as refractory mortar or the like.

On the other hand, the edge dam 10 is preheated before casting, or hot molten steel is supplied to the edge dam during casting. At this time, due to the thermal deformation of the base refractory material 11 or the difference in thermal expansion coefficient between the base refractory material 11 and the sealing plate 12, there is an adhesive 13 between the base refractory material 11 and the sealing plate 12, but there is a gap. It forms and molten steel penetrates through the gap. In addition, in the gap between the base fireproof material 11 and the sealing plate 12, molten steel solidifies and sticks to grow into a solidified body.

This coagulation body is repeatedly peeled off and pressed between the casting rolls and inserted into the gap between the base refractory material and the sealing plate to separate and damage the sealing plate from the base refractory material. For this reason, the casting process becomes unstable and there is a problem that defects are generated in the edge portion of the cast slab.

An object of the present invention is to provide an edge dam for a double roll type sheet caster which can prevent a gap from being generated between a base fireproof material and a sealing plate, and prevent molten steel from penetrating into the gap.

In another aspect, the present invention is to stably attach the sealing plate to the refractory material, to provide an edge dam for a twin roll sheet caster that can implement a stable casting operation.

The present invention is an edge dam installed on both sides of the casting rolls, in order to trap the molten steel between a pair of casting rolls. A base refractory material forming an overall shape of the edge dam and positioned on a side of the casting roll; A sealing plate inserted into the base refractory material along a portion of an edge of the casting roll side and in close contact with the casting roll side to seal the molten steel; An attachment material for attaching the sealing plate to the ground fireproof material; And a patching material inserted and attached along a boundary between the base fireproof material and the sealing plate.

In addition, the sealing plate protrudes from the base refractory material toward the side of the casting roll, is formed by cutting and including an edge adjacent to the boundary with the base refractory material, the patching material is inserted and attached over the base refractory material Disclosed is an edge dam comprising a patching insert.

The patch inserting portion may include: a patching surface recessed between the base refractory material and the sealing plate and stacked with the patching material; And an intersecting patching surface spaced apart from the base refractory material while intersecting with the patching surface.

In addition, the patching surface and the cross-patching surface discloses an edge dam, characterized in that formed at an angle between 60 ° to 90 °.

In addition, the patching surface is formed to be further recessed by 2 mm to 10 mm than the base refractory material, the cross patching surface is an edge dam characterized in that spaced apart from the base refractory material at intervals of 2 mm to 10 mm .

In addition, the sealing plate discloses an edge dam, characterized in that protruding by 2 mm to 5 mm more than the base refractory material.

In addition, the patching material discloses an edge dam, characterized in that attached to the base fireproof material in a width of 2 mm to 10 mm and a thickness of 2 mm to 5 mm.

Also disclosed is an edge dam comprising a mixture of an oxide-based refractory raw material and an inorganic binder having an average particle size of less than 150 μm.

Edge dam for twin roll sheet caster according to the present invention has the following effects.

(1) An edge dam for a twin roll sheet caster according to the present invention includes a base fireproof material, a sealing plate, an attachment material and a patching material, and attaches the patching material to the boundary between the base fireproof material and the sealing plate. In particular, in order to improve the adhesion of the patching material, the sealing plate is formed with a cutout inserting portion including an edge adjacent to the boundary with the base refractory material, and the patching material is attached while being inserted into the patching insertion part over the base refractory material. For this reason, the edge dam for the twin roll sheet casting machine according to the present invention tightly seals the boundary between the base refractory material and the sealing plate using a patching material, thereby preventing the occurrence of a gap between the base refractory material and the sealing plate, and It has the effect of preventing the penetration of molten steel.

(2) The edge dam for the twin roll sheet casting machine according to the present invention prevents penetration of molten steel between the base refractory material and the sealing plate, thereby firmly attaching the sealing plate to the base fireproof material. Therefore, the edge dam for the twin roll sheet caster according to the present invention may prevent the leakage of molten steel due to damage of the sealing plate, it has the effect of implementing a stable casting operation.

1 is a view showing the edge dam is used in a twin-roll sheet caster.
2 is a plan view showing an edge dam for a twin roll sheet caster according to the prior art and a cross-sectional view showing a state cut along the line AA.
3 is a plan view showing an edge dam for a twin roll sheet caster according to a preferred embodiment of the present invention and a cross-sectional view showing a cut along the line BB.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

3 is a plan view showing an edge dam 100 for a twin roll sheet caster according to a preferred embodiment of the present invention and a cross-sectional view showing a cut along the line B-B. As shown in FIG. 1, the edge dam 100 for a twin roll sheet caster according to a preferred embodiment of the present invention includes a base fireproof material 101, a sealing plate 102, an attachment material 103, and a patching material 104. It includes, close to the sides of the casting roll (R, R ') to form a molten steel pool (2 in Figure 1) to seal the supplied molten steel.

The base refractory material 101 forms the overall shape of the edge dam 100 and is located at the side of the casting rolls R and R '. The base refractory material 101 is a composition of refractory raw materials, such as alumina, mullite, silica, zirconia, silicon carbide, graphite, etc., and is manufactured in plate form by baking or fluorine. In addition, one surface of the base fireproof material 101 may be formed with a base groove 111 into which the sealing plate 102 may be inserted.

The sealing plate 102 is inserted into the base refractory material 101 along a portion of the edge of the casting roll side. At this time, the sealing plate 102 is inserted into the base groove 111 of the base fireproof material (101). In addition, the sides of the casting roll (R, R ') is in close contact can seal the molten steel supplied to the molten steel pool (1) formed by the edge dam (100).

The sealing plate 102 is a sintered body in which boron nitride is combined with alumina, mullite, zirconia, silica, silicon carbide, silicon nitride, aluminum nitride, sialon, or a combination thereof. Because of this, the sealing plate 102 has good corrosion resistance, heat resistance and appropriate wear characteristics. In addition, the sealing plate 102 can prevent the wear of the base refractory material 101 by the rotation of the casting roll (R, R ').

On the other hand, a patch inserting portion 121 is formed in the sealing plate 102. At this time, the sealing plate 102 is in a state protruding from the base refractory material 101 toward the side of the casting roll (R, R ').

The patching insertion part 121 is formed by cutting the sealing plate 102 in a state including the edge of the sealing plate 102 adjacent to the boundary with the base fireproof material 101, and is formed between the base fireproof material 101 and the sealing plate 102. Is formed into a space of constant size. For this reason, the patching material 104 may be inserted into the patching inserting portion 121 between the base refractory material 101 and the sealing plate 102. In addition, the patch inserting portion 121 includes a patching surface 121a and a cross patching surface 121b.

The patching surface 121a may be recessed between the base refractory material 101 and the sealing plate 102, and the patching material 104 may be stacked. In addition, the crossing patching surface 121b is spaced apart from the base fireproof material 101 while crossing the patching surface 121a.

The attachment material 103 attaches the sealing plate 102 to the base fireproof material 101. For this reason, the sealing plate 102 is fixed in the state inserted into the base groove 111 of the refractory refractory material 101. In addition, the attachment material 103 is in the form of an adhesive such as a high temperature adhesive or a refractory mortar.

The patching material 104 is attached along the boundary between the base refractory material 101 and the sealing plate 102. At this time, the patching material 104 is inserted and attached to the patching insertion portion 121 as mentioned above. For this reason, molten steel does not penetrate into a gap between the boundary between the base fireproof material 101 and the sealing plate 102.

In addition, the patching material 104 is a mixture of an oxide-based refractory raw material having an average particle size of less than 150㎛ and inorganic binders such as alumina, water glass, aluminum phosphate, etc., and is mixed with 10% to 40% by weight of water. It is inserted and attached along the boundary between the fireproof material 101 and the sealing plate 102. However, when the adhesive force between the base fireproof material 101 and the patching material 104 and between the sealing plate 102 and the patching material is weak, the patching material 104 may fall off during casting. For this reason, it is preferable that the patching material 104 is attached along the boundary of the base fireproof material 101 and the sealing plate 102 in the state inserted into the patching insertion part 121 formed in the sealing plate 102. Thus, the patching material 104 may be more firmly attached along the boundary between the base fireproof material 101 and the sealing plate 102.

In addition, in order to firmly attach the patching material 104, it is preferable that the sealing plate 102 and the patching material 104 have the following conditions.

In the patching insertion part 121 of the sealing plate 102, the patching surface 121a and the cross patching surface 121b which mutually intersect mutually, forming the angle between 60 degrees and 90 degrees. At this time, if the angle between the patching surface 121a and the cross patching surface 121b is smaller than 60 °, the attaching operation of the patching material 104 is not easy. On the other hand, if the angle between the patching surface 121a and the cross patching surface 121b is greater than 90 °, the patching material 104 is pushed away by the molten steel.

In addition, the patching surface 121a has a width W and a depression depth D of 2 mm to 10 mm, and the sealing plate 102 has a protruding height H of 2 mm to 5 mm. Here, the width W means the distance between the base refractory material 101 formed by the patching surface 121a and the cross patching surface 121b, and the depression depth D is the patching surface based on the base refractory material 101. Denoted depth (121a) refers to the depth, protruding height (H) refers to the height of the sealing plate 102 protruding from the base fireproof material (101).

On the other hand, when the width W of the patching surface 121a is narrower than 2 mm, the attachment work of the patching material 104 is not easy and the adhesive force of the patching material 104 falls. On the other hand, if the width W of the patching surface 121a is wider than 10 mm, cracking occurs in the patching material 104 when the sealing plate 102 is deformed, and the patching material 104 is the sealing plate 102. ) Can be separated.

In addition, if the recessed depth D of the patching surface 121a is shallower than 2 mm, the patching material 104 may not be firmly attached and may be separated during casting. On the other hand, when the recessed depth D of the patching surface 121a is deeper than 10 mm, when the width W of the packing surface 121a is relatively narrow, the attachment work of the patching material 104 is not easy, and the packing When the width W of the surface 121a is relatively large, the patching material 104 may be sintered and contracted to cause cracking.

The protruding height H affects the thickness of the patching material 104 on the ground fireproof material 101. If the projecting height H is lower than 2 mm, the patching material 104 cannot be firmly attached on the ground fireproof material 101. On the other hand, when the protrusion height H is higher than 5 mm, the patching material 104 may be firm and adhered, but the sealing plate 102 is excessively protruded and the sealing plate 102 is formed by the casting rolls R and R '. ) May be damaged.

The patching material 104 has a thickness of 2 mm to 5 mm and a width PW of 2 mm to 10 mm on the ground fireproof material 101. At this time, the thickness of the patching material 104 is affected by the protrusion height (H). In addition, if the width PW of the patching material 104 on the ground fireproof material 101 is smaller than 2 mm, the patching material 104 cannot be firmly attached on the ground fireproof material 101. On the other hand, if the width PW of the patching material 104 is greater than 10 mm on the base fireproof material 101, cracking may occur in the patching material 104 when the width W of the patching surface 121a is 10 mm. Alternatively, a solidified body of molten steel may be fixed onto the patching material 104.

Therefore, the edge dam 100 according to the present invention has a patching material 104 at the boundary between the base refractory material 101 and the sealing plate 102 through the size of the preferred patching insertion portion 121 and the patching material 104. Attach firmly. Due to this, when the edge dam 100 is preheated and the casting operation is performed, the molten steel can be prevented from penetrating into the gap due to the thermal expansion difference or thermal deformation between the base refractory material 101 and the sealing plate 102, This can also prevent the sticking of the coagulum. In addition, the sealing plate is stably coupled to the base refractory material, it is possible to implement a stable casting operation.

While the present invention has been described in connection with certain exemplary embodiments, it will be understood by those skilled in the art that various changes may be made without departing from the scope of the present invention.
The scope of the present invention is determined by the matters set forth in the claims, and the parentheses used in the claims are not for the purpose of selective limitation, but rather for the sake of clarity. Should be.

100: edge dam 101: ground refractory
102: sealing plate 103: adhesive
104: patching material 121: patching insertion portion
121a: patching face 121b: cross patching face

Claims (8)

An edge dam installed on both sides of the casting rolls to trap molten steel between a pair of casting rolls.
A base refractory material forming an overall shape of the edge dam and positioned on a side of the casting roll;
A sealing plate inserted into an inner surface of the base refractory material along a portion of an edge of the casting roll side surface, protruding from the base refractory material toward the side of the casting roll, and sealing the molten steel in close contact with the casting roll side;
An attachment material for attaching the sealing plate to the ground fireproof material;
A patching material inserted into and attached along a boundary between the inner surface of the base fireproof material and the sealing plate; And
And a patching insert formed by cutting the edge of the sealing plate adjacent to the boundary with the base refractory material, wherein the patching material is inserted and attached to the base refractory material.
The patch inserting portion,
A patching surface recessed between the base fireproof material and the sealing plate, and the patching material stacked thereon; And
An intersecting patching surface spaced apart from the base refractory material while intersecting with the patching surface,
And the patching surface and the cross patching surface are formed at an angle between 60 ° and 90 °.
delete delete delete The method of claim 1,
The patching surface is formed to be recessed further by 2 mm to 10 mm than the base refractory material, wherein the cross patching surface is spaced apart from the base refractory material at intervals of 2 mm to 10 mm.
The method of claim 1,
The sealing plate is an edge dam, characterized in that protruding by 2 mm to 5 mm more than the base refractory material.
The method of claim 1,
The patching material is the edge dam, characterized in that attached to the base fireproof material in a width of 2 mm to 10 mm and a thickness of 2 mm to 5 mm.
The edge dam of claim 1, wherein the patching material is a mixture of an oxide-based refractory raw material and an inorganic binder having an average particle size of 150 μm or less.
KR20100131933A 2010-12-21 2010-12-21 Edge dam for twin roll type strip caster KR101273962B1 (en)

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KR20100131933A KR101273962B1 (en) 2010-12-21 2010-12-21 Edge dam for twin roll type strip caster

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KR101273962B1 true KR101273962B1 (en) 2013-06-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200068406A (en) 2018-12-05 2020-06-15 주식회사 포스코 Edge Dam For Twin Roll Type Strip Caster

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09206892A (en) * 1996-01-29 1997-08-12 Nippon Steel Corp Side weir of apparatus for continuous production of sheet
JPH11197802A (en) * 1998-01-16 1999-07-27 Hitachi Zosen Corp Side weir in twin roll type thin plate continuous casting equipment, manufacture thereof and repairing method therefor
KR20070057233A (en) * 2004-09-02 2007-06-04 에이에스 런겐 게엠베하 Material mixture for producing casting moulds for machining metal
KR20090065689A (en) * 2007-12-18 2009-06-23 주식회사 포스코 Edgedam sealing plate for twrin roll strip casting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09206892A (en) * 1996-01-29 1997-08-12 Nippon Steel Corp Side weir of apparatus for continuous production of sheet
JPH11197802A (en) * 1998-01-16 1999-07-27 Hitachi Zosen Corp Side weir in twin roll type thin plate continuous casting equipment, manufacture thereof and repairing method therefor
KR20070057233A (en) * 2004-09-02 2007-06-04 에이에스 런겐 게엠베하 Material mixture for producing casting moulds for machining metal
KR20090065689A (en) * 2007-12-18 2009-06-23 주식회사 포스코 Edgedam sealing plate for twrin roll strip casting

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200068406A (en) 2018-12-05 2020-06-15 주식회사 포스코 Edge Dam For Twin Roll Type Strip Caster

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