JPH11320036A - Side weir for twin roll type continuous caster - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of molten metal from a gap between a side weir and cooling rolls in a continuous casting of a wide and thin cast slab by using a twin roll type continuous caster. SOLUTION: In a twin roll type continuous caster constituted with a pair of cooling rolls and a pair of side weirs pushed to both end surfaces of the cooling rolls, the side weir is divided into two of an upper side weir 10 and a lower side weir 20 in the molten metal surface part, so that thermal deformation is small. Further, in each of the upper side weir 10 and the lower side weir 20, actuators 34a-34c are arranged. Therefore, even the side weir is thermally deformed to be recessed or projecting, the upper side weir 10 and the lower side weir 20 are individually changed to each inclining direction and straightened by pushing the upper side weir 10 and the lower side weir 20 to the end surfaces of the cooling rolls 1 with the actuators 34a-34c to closely stick the both side weir surfaces to the end surfaces of the cooling rolls 1. Leakage of the molten steel from a gap between the side weir 9 and the cooling rolls 1 is therefore prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for pressing a side weir against an end face of a cooling drum in a twin drum type continuous casting.

[0002]

2. Description of the Related Art As shown in FIG. 1, a pair of rotating cooling drums 1 is used for continuous casting of wide and thin cast slabs using a twin-drum continuous casting machine generally known in the art.
a, 1b and a pair of side weirs 2a, 2b pressed against both end surfaces of the drum to supply a molten metal e to a pool, and the supplied molten metal is cooled by a cooling drum to form a solidified shell. The solidified shell is pressed and integrated at the closest part of the cooling drum to obtain a wide thin cast slab c.

[0003] The side dams 2a and 2b are connected to a molten metal e in a pool.
It is inevitable to seal to prevent leakage, and generally such side weirs are
As disclosed in Japanese Patent Application Laid-Open No. 3-90548, FIG.
(Cross-sectional view).

That is, the side weir 2 comprises a bottom plate 3a and a side plate 3b.
, A refractory material 4 housed in the case, a base member 5 planted in the refractory material, a heater 6 built in the base member, and a plant material in the base member. And a ceramics plate 7 formed. It is also known that a stiffener (not shown) for preventing thermal deformation is attached to the back of the side weir case 3.

[0005] However, when the side weir as described above is used, molten metal leakage may occur, particularly when casting is performed for a long time. When molten metal leaks, the condition continues, and the side weir loses its function in a short time, making it impossible to continue casting.In addition, casting burrs occur on both ends of the slab. In addition to impairing the shape, meandering tends to occur during transport. The casting burrs cause damage to the slab transport line and the rolling mills provided on the slab transport line, and meandering causes turbulence in the slab winding shape.

FIG. 3 shows a side weir that prevents molten metal leakage.
The one described in Japanese Patent Application Laid-Open No. Hei 5-161943 is known. The side weirs are provided with hydraulic actuators 8 at two locations above and below the case bottom plate 3a, and by simultaneously moving the hydraulic actuators 8 and 8 at a constant speed, it is possible to prevent sealing failure due to thermal deformation of the side weirs.

That is, the side weir 2 during casting undergoes a concave, convex or complicated thermal deformation due to thermal expansion of the base member 5 and the side weir case 3, and a gap is formed between the side weir 2 and the end face of the cooling drum 1. In this case, when the hydraulic actuators 8 and 8 are simultaneously advanced at a constant speed, the convex portion t wears out faster than the other portions, so that the entire surface of the side weir 2 comes into close contact with the end surface of the cooling drum 1. However, in this case, since it is premised that the protruding portion t wears out quickly, it cannot sufficiently cope with the case where the speed and amount of the thermal deformation of the side dam are large, particularly in the case of long-time casting.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to ensure that when a side weir is thermally deformed during casting, the side weir is securely attached to the end face of the cooling drum without relying on the wear of the side weir. I do.

[0009]

A side weir for a twin-drum continuous casting machine according to the present invention which solves the above-mentioned problems comprises a pair of cooling drums and a pair of side weirs pressed against both end surfaces of the cooling drum. In the side weir of the twin drum type continuous casting machine, the side weir has a two-part structure of an upper side weir and a lower side weir on a molten metal surface, and the upper side weir and the lower side weir are connected by a connecting mechanism. And a pressing mechanism is provided on each of the upper side weir and the lower side weir.

[0010]

4 and 5 are views for explaining a side weir according to claims 1 and 2 of the present invention. A side weir 9 is provided at an upper side weir 10 at a molten metal surface in contact with a molten metal e. The lower side weir 20 is divided into two parts. x indicates the boundary of division. Side weir cases 11 and 21 (for example, made of SS41) forming the frame of each side weir 10 and 20
In this case, irregular shaped refractories 30 (for example, fused SiO ₂ ) for heat insulation are respectively accommodated, and base members 31a to 31c (for example, high alumina bricks) are implanted in the irregular shaped refractories 30. The base member 31a
A plurality of ceramic plates 32 (a total of 17 plates in the figure) are adhered to a groove (not shown) provided at a portion facing the peripheral edge (flange portion) of the cooling drum of Nos. 31c.

The upper side weir 10 and the lower side weir 20
They are connected by a butterfly plate 33 as a connecting mechanism so that they do not separate from each other and a gap is generated between them. On the left and right sides on the back of the case bottom plate 11a of the upper side weir 10,
Hydraulic actuators 34a and 34 as a pressing mechanism
4 is provided at the position shown in FIG. 4, and a hydraulic actuator 34 c as a pressing mechanism is also provided at the center of the back surface of the side weir case bottom plate 21 a of the lower side weir 20. And 20 alone can be pressed against the end face of the cooling drum 1.

The actuators 34a to 34c are installed at the center of a portion (a portion of the ceramic plate 32) facing the peripheral portion (flange portion) of the cooling drum for each of the base members 31a to 31c. It is desirable to obtain a surface pressure balance for each base member. As shown in FIG. 4, the number of actuators 34a to 34c provided is only one at the center of the ceramic plate 32 for one base member, or a plurality of actuators are provided at equal intervals from the center. You may. In any case, it is desirable to obtain the surface pressure balance of the base member.

The upper side weir 10 and the lower side weir 20 are provided with base members 31a to 31
A heater 35 (a total of six places in the figure) using a SiC heating element or the like is embedded in 1c, a cooling mechanism for preventing thermal deformation of the metal case is attached to the back of the metal case, and an inner surface of the metal case is provided. It is desirable that a Y-shaped anchor for fixing the irregular-shaped refractory is attached, but illustration is omitted for simplicity of explanation.

After the refractory is preheated to a predetermined temperature by the heater 35 in which the side weir 9 constructed as described above is buried in the base members 31a to 31c, it is pressed against both end surfaces of the cooling drum 1 to perform casting. In the conventional side weir 2 shown in FIG. 3, the side weir case 3 and the base member 5 are thermally deformed into a convex shape or a concave shape due to thermal expansion, but the side weir 9 of the present invention comprises an upper side weir 10 and a lower side weir 20. , The amount of thermal deformation is small.

In addition, since the upper side weir 10 and the lower side weir 20 are provided with the pressing mechanisms 34a to 34c, respectively, the upper side weir 10 and the lower side weir 20 are moved by the pressing mechanisms 34a to 34c. When pressed against the end face, the upper side weir 10 and the lower side weir 20
Are individually corrected by changing their inclinations, so that they adhere to the end surface of the cooling drum 1. As a result, the side weir 9 and the cooling drum 1 generated by the deformation of the side weir, such as concave or convex,
Molten metal can be prevented from leaking from the gap between the molten metal.

FIG. 6 is a view for explaining a side weir 40 according to claim 3 of the present invention. The difference from FIGS. 4 and 5 is that
As a connecting mechanism, for example, a bellows-shaped member 4 formed by bending spring steel
1 is that the upper side weir 10 and the lower side weir 20 are connected.

[0017]

EXAMPLE A SUS304 stainless steel was cast using a twin-drum continuous caster provided with side dams 9 and 40 shown in FIGS. 4 to 6, and a wide thin cast piece having a width of 1200 mm and a thickness of 4 mm was continuously formed. Cast. In the example of the present invention, the molten metal did not leak for one hour, and a cast having a good shape could be stably cast. On the other hand, in the conventional example of the unified structure without the split structure, the molten metal often leaks, and this state continues, and the side weir loses its function in a short time, so that the casting cannot be continued. Was.

[0018]

Since the side weir of the present invention has a two-part structure of an upper side weir and a lower side weir, the amount of thermal deformation is smaller than that of a conventional integrated body. In addition, since the inclination of each side weir can be changed independently, it can be pressed against the end face of the cooling drum and brought into close contact therewith. As a result, it is possible to prevent the molten metal from leaking from the gap with the end face of the cooling drum.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a twin-drum continuous casting machine.

FIG. 2 is a sectional view showing a conventional side weir.

FIG. 3 is a cross-sectional view showing a joint opening of a base member of a side weir.

FIG. 4 is a front view of a side weir according to one embodiment of the present invention.

FIG. 5 is a sectional view taken along line YY of FIG. 4;

FIG. 6 is a cross-sectional view of a side dam according to another embodiment of the present invention.

[Explanation of symbols]

 1a, 1b cooling drum 2 side dam 2a, 2b side dam 3 side dam case 3a case bottom plate 3b case side plate 4 irregular shaped refractory 5 base member 6 heater 7 ceramic plate 9 Side weir of the present invention 10 ... Upper side weir 11 ... Side weir case 11a ... Case bottom plate 20 ... Lower side weir 21 ... Side weir case 21a ... Case bottom plate 30 ... Irregular refractory 31 ... Base member 32 ... Ceramic plate 33 ... Butterfly Plate (connecting member) 34 ... Hydraulic actuator (pressing mechanism) 35 ... Heater 40 ... Another side weir 41 of the present invention 41 ... A bellows-like member (connecting member) c ... Wide thin cast slab t ... Protrusion

Claims (3)

[Claims] 1. A side dam of a twin-drum continuous casting machine comprising a pair of cooling drums and a pair of side dams pressed against both end surfaces of the cooling drum, wherein the side dam is located above a molten metal surface portion. Side weir and lower weir 2
A twin drum, wherein the upper side weir and the lower side weir are connected by a connecting mechanism, and a pressing mechanism is provided for each of the upper side weir and the lower side weir. Side dam for continuous casting machine. 2. The side dam for a twin-drum continuous casting machine according to claim 1, wherein the connecting mechanism is a hinge. 3. The side dam for a twin-drum continuous casting machine according to claim 1, wherein the connecting mechanism is a bellows-like member.