JP3241319B2 - Drum type strip caster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strip-shaped slab which is continuously supplied with molten metal from an immersion nozzle to a pool formed by a pair of cooling drums and side dams, and cooled and solidified by both cooling drums. The present invention relates to a drum-type strip caster that is continuously pulled out from below, and more particularly to a drum-type strip caster in which the quality of cast slab is prevented from being reduced by scum floating on a meniscus in a basin.

[0002]

2. Description of the Related Art In a drum-type strip caster, when scum floating on a meniscus in a pool part formed of a pair of cooling drums and side dams is caught in a cast piece, the quality of the cast piece deteriorates. It is desired to remove it.

[0003] Rotating 1 of a drum type strip caster
The metal oxide (Al ₂ ) floating on the meniscus of the basin comprising a pair of water-cooled drums and a pair of fixed side weirs.
As an example of a conventional apparatus for removing scum mainly composed of an O ₃ —SiO ₂ ) melt, there is Japanese Patent Application Laid-Open No. 5-228585 entitled “Scum Removal Apparatus for Continuous Strip Casting Apparatus”.

[0004]

In the scum removing apparatus of the continuous sheet slab apparatus, a metal wire is intermittently immersed in the meniscus, and the scum is attached to the wire to remove the scum. However, there is a problem that the wire melts into the molten metal and changes the components of the molten metal.

[0005] Further, since the wire has a small scum attachment area, it is difficult to completely remove the scum from the meniscus, and the remaining scum may be caught in the slab, so that the continuously cast scum may be formed. The quality of the pieces was reduced.

The present invention provides a drum type strip caster in which a scum floating on a meniscus of a water pool formed by a pair of rotating cooling drums and stationary side dams can be effectively removed. It is an issue.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a scum floating Al ₂ O _{3 in} a meniscus in a well pool comprising a pair of rotating cooling drums and fixed side dams. -Made of ceramics with good wettability with the SiO ₂ melt and protrusions for capturing scum horizontally on the surface
A drum type provided with a plate-like scum attachment material provided with a plate-like scum attachment material and a plate-like scum attachment material raising / lowering means for intermittently immersing the plate-like scum attachment material in the meniscus of the pool in the vertical direction. Provide a strip caster.

[0008]

In the drum type strip caster according to the present invention, a ceramic scum having good scum floating and good wettability is provided on the meniscus of the pool .
By intermittently immersed in the vertical direction Chakuzai respect meniscus basin portion, the plate-like scum deposited scum
It can be removed by attaching it to the material . Moreover, unlike the conventional scum removing device, the wire does not dissolve in the molten metal and change its components.

Further, the drum type strip according to the present invention is provided.
The plate-like scum deposition material used in Pukyasuta, and a convex portion provided structure for scum captured in the horizontal direction of the surface of its
Therefore , it is possible to prevent the scum that has once adhered to the plate-like scum adhering material from falling off, and the scum can be reliably removed from the meniscus. As described above, according to the drum-type strip caster of the present invention, it is possible to prevent the scum from being caught in the slab, and it is possible to continuously cast a high-quality slab having no defects on the surface. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described based on a drum type strip caster according to an embodiment shown in FIGS. 1 and 2, 5
Reference numeral 1 denotes a pair of cooling drums, which rotate in mutually opposite directions, and both side surfaces of which are supported by bearings (not shown) so as to slide with fixed side dams 52.
The pool drum 50 is formed by the cooling drum 51 and the side weir 52.

Reference numeral 54 denotes a seal chamber, and the pool 5
An inert gas supply pipe 55 is mounted on the upper surface of the side weir 52 so as to seal 0. Numeral 53 denotes an immersion nozzle which is fixed to a tundish (not shown) so as to penetrate through the upper surface of the seal chamber 54 and to immerse the lower part in the molten metal 61 of the basin 50. Supply.

Reference numeral 1 denotes a pair of plate-like scum adhering materials. The scum adhering material is provided so as to be vertically movable by an elevating cylinder 2 penetrating an upper surface of a seal chamber 54 so that lower portions thereof are immersed in a molten metal 61 of a basin 50. ing.

As shown in FIGS. 3 and 4, a plate-like scum is provided.
As the bonding material 1, a scum 63 mainly composed of an Al ₂ O ₃ —SiO ₂ melt and a ceramic plate having a width W × height H × thickness t having good wettability are used. A scum trapping groove 1a having a convex height h, a convex width w, and a convex interval p is formed.

In the drum type strip caster shown in FIGS. 1 and 2 having the above configuration, the seal chamber 5
4, an inert gas 56 is supplied from an inert gas supply pipe 55 to make the pool 50 an antioxidant atmosphere, and molten metal 61 is continuously supplied from the immersion nozzle 53 to the pool 50.
The slab 62 cooled and solidified by the two cooling drums 51 is pulled out from below.

During continuous casting of the slab 62, a plate-like scum
The material 1 is intermittently lowered by the lifting cylinder 2 and immersed in the molten metal 61 for a certain time as shown in FIG.
Then, the scum 63 is attached to the meniscus 61a by removing the scum 63 from the meniscus 61a so that the scum 63 is not dropped by the scum capturing projection 1a.

As an experiment, outer diameter = 600 mm, width = 60
Casting was carried out on a strip caster comprising a pair of 0 mm cooling drums 51 under the following conditions. Slab type: SUS304, slab thickness: 2.8 mm, casting speed =
40 m / min. , Size of the immersion plate 1: width W = 20 mm
× height H = 100 mm × thickness t = 3 mm, material of the immersion plate 1: Si ₃ O ₄ ceramics, dimensions of the scum catching convex portion 1 a: convex portion height h = 1 mm, convex portion width w = 1 mm, convex portion Interval p = 2 mm.

Under the above-mentioned casting conditions, during the casting of the slab 62, the plate-like scum adhering material 1 is removed every 10 minutes for 10 minutes.
By dipping in the meniscus 61a for a second, it was possible to prevent the scum 63 from getting caught in the cast piece 62.

In the drum type strip caster, the scum 63 floating on the meniscus 61a of the pool 50 is provided.
The scum 63 is provided with a plate-shaped scum having a large adhesion area by intermittently immersing the plate-shaped scum adhering material 1 made of ceramics having good wettability with the lifting cylinder 2 .
This makes it possible to remove the wire by attaching it to the adhesive material 1, so that the wire does not melt into the molten metal 61 and change its components as in the conventional scum removing device. Therefore, it is possible to continuously cast the high-quality slab 62, and the structure can be simplified since the wire supply device is not required.

Further, since the scum catching groove 1a is provided in the plate-like scum attaching material 1, it is possible to prevent the scum 63 once attached from falling off, and to reliably remove the scum 63 from the meniscus 61a. Can be. Therefore,
It is possible to prevent the scum 63 from being caught in the cast piece 62, and it is possible to continuously cast a high-quality cast piece 62 having no defect on the surface.

[0021]

As described above, in the drum type strip caster of the present invention , the surface of the scum floating on the meniscus of the pool is made of ceramics having good wettability with the Al ₂ O ₃ —SiO ₂ melt. Scum capture horizontally
A plate-shaped scum adhering material provided with a convex portion for; and a plate-shaped scum adhering material elevating means for intermittently immersing the plate-shaped scum adhering material vertically in the meniscus of the well section. Is provided.

In the drum-type strip caster according to the present invention, the floating scum and the ceramic plate-like scum adhering material having good wettability are intermittently immersed in the meniscus of the pool. by, scum its plate-like
It can be removed by attaching it to the scum attachment material .

Further, since the drum-type strip caster of the present invention has a structure in which a scum catching protrusion to the plate-like scum adhering material, to prevent falling off of scum adhered once to the plate-like scum adhering material Scum can be reliably removed from the meniscus. Thus, according to the drum type strip caster of the present invention,
It is possible to prevent the scum from being caught in the slab, and it is possible to continuously cast a high-quality slab having no defects on the surface.

[Brief description of the drawings]

FIG. 1 is a front view of a drum type strip caster according to an embodiment of the present invention, in which one side weir is removed and broken.

FIG. 2 is a side view taken along the line II-II of FIG.

FIG. 3 is an enlarged front view of the scum attachment plate of FIG. 1;

FIG. 4 is a side view of FIG. 3;

[Explanation of symbols]

1 plate-shaped scum adhering material 1a scum catching convex part 2 elevating cylinder 50 water pool part 51 cooling drum 52 side dam 53 immersion nozzle 61 molten metal 61a meniscus 62 cast 63 scum h convex part height w convex part spacing p convex part spacing

Continuation of the front page (72) Inventor Hideaki Takaya 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Laboratory, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-5-228585 (JP, A) JP-A-2 -207946 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 11/06

Claims (1)

(57) [Claims] 1. A scum floating on a meniscus of a pool formed by a pair of rotating cooling drums and fixed side dams, made of ceramics having good wettability with Al ₂ O ₃ —SiO ₂ melt. Convex for capturing scum horizontally on the surface
A plate-like scum adhering material provided with a portion, and a plate-like scum adhering material raising / lowering means for intermittently immersing the plate-like scum adhering material vertically in a meniscus of the pool section. A drum type strip caster characterized by the following.