KR200283712Y1 - Sealing members of dummy bar of the continuous casting machine - Google Patents

Abstract

The present invention relates to a sealing member for a dummy bar of a continuous casting machine, wherein a rectangular reticulated body such as an expander metal and a spacer bar serving as a supporting rod are laminated and welded in multiple layers so as to intersect horizontally and vertically. The mesh is larger and the lower part constitutes a three-dimensional sealing of thinner and smaller densities of the reticular body, and a plurality of sealings are formed on the metal chip of the head of the terminal to keep the reticular in a horizontal plane. Since the molten steel injected into the mold is buffered by repetitive dispersion, filtration, cooling and fluid resistance by sealing, the sealing and molten steel is cooled and solidified before reaching the metal chip, thereby preventing the metal chip from being swept. It is to improve the separation between the dummy bar and the cast.

Description

Sealing member for dummy bar of continuous casting machine {SEALING MEMBERS OF DUMMY BAR OF THE CONTINUOUS CASTING MACHINE}

The present invention relates to a sealing for a dummy bar of a continuous casting machine.

An example of a continuous casting apparatus using a general molten steel is as shown in FIG.

In Fig. 1, a ladle installed in a ladle turret is filled with molten steel in which impurities are removed and chemical components are adjusted, and the molten steel in the ladle is tundished through a cylindrical refractory brick nozzle. Molten steel is introduced into a mold through a cylindrical inner and brick deposition nozzle, which is poured into the tunnel and stored therein, and is cast into a slab of a large plate by the mold. Since the mold is provided with a cooling mechanism therein, molten steel flows in and is cooled to cast a slab into the cross section of the mold.

At this time, as shown in Figure 2, in the mold, a dummy bar (Dummy Bar) for guiding the withdrawal guide flows into the open lower part of the mold and the first molten steel introduced into the mold solidifies the uneven portion of the dummy bar head As a plurality of rollers installed in the moving tracks are driven, the dummy bars lead the solidified slabs and move between the upper and lower rollers to which the splay cooling water is sprayed to continuously manufacture long slabs.

At the beginning of casting of molten steel, the casted piece is drawn out by the dummy bar, but once the solidified piece passes between the transfer rollers, the dummy bar is not necessary after that, and the dummy bar is separated by the separating device and raised upward. The cast slab is cut into a predetermined length by an automatic cutting machine, and is collected and conveyed by a table roller to a collecting cabinet.

However, when molten steel is directly welded to the uneven portion of the dummy bar head, it becomes difficult to separate the dummy bar, so as shown in FIG. 3, in order to prevent this, the head of the dummy bar B in the mold M is generally used. The metal chip (ch) is laid at a predetermined thickness on (H) to prevent the molten steel flowing into the mold from being directly welded to the dummy bar by the metal chip, so that the dummy bar and the solidified slab are easily separated later.

However, in practice, the molten steel flowing into the mold from the tundish has a considerable weight and the downward pressure is applied, so when the molten steel is directly in contact with the metal chip, the metal chip is swept in all directions to expose a part of the dummy bar head. When molten steel is welded to the exposed surface of the dummy bar, the solidification angle of the cast steel is torn when the dummy bar is separated, thereby causing an operation accident (Break Out). Due to the nature of continuous casting facilities, once an accident occurs, there is a fatal economic loss.

Therefore, a means for preventing the metal chip laid on the dummy bar head from being washed out by molten steel first introduced into the mold has been devised.

In order to prevent dispersion of a conventional metal chip, for example, as shown in FIGS. 4 and 5, the head H of the dummy bar B introduced into the lower opening of the mold M is shown. When the metal chip (ch) is laid to a predetermined thickness and several coil-like cores (C) are mounted side by side and molten steel (S) is injected into the mold (M) through the nozzle N of the tundish, The molten steel is somewhat buffered in the process of flowing down between the cores (C) and the molten steel is cooled by the core (C) while the molten steel (S) and the core (C) are integrally welded at the same time. There is an attempt to facilitate the separation of the dummy bar (B) and the solidified cast afterwards.

However, as can be seen in FIG. 5, since the core C on the coil forms a rod, it is difficult to mount the coil gaps of the core in a planar manner and the cores are bundled. Due to the agglomeration, the inflow of molten metal does not have high planar dispersion, filtration, and cooling functions, and there is insufficient buffering effect against the pouring impact of molten steel, so that the molten steel flows directly to any part of the dummy head. The molten steel was swept by the molten steel, and the molten steel was fused to the exposed head of the dummy bar, which made it difficult to separate after solidification.

The present invention is a dummy bar sealing member (sealing section) of the continuous casting device, in order to correct the problems of the prior art, a plurality of metal meshes of rectangular expender dither metal, and a supporting rod to prevent the metal meshes from hanging at high temperatures. While placing a plurality of spacer bars made of round bars alternately horizontally and vertically to maintain the vertical gap of the metal meshes, and welding the multiple meshes to be stacked up and down with the spacer bars in between. It is composed of a sealing member of a three-dimensional network.

In addition, the material of the upper reticular body of the sealing member is thicker and the net is made larger so that it can have the primary cooling action of the molten steel at the same time maintaining the strength that can cope with the load of the molten metal, and the lower reticle of the sealing member. The material of is thinner, the net is smaller and has a dense distribution, which promotes the cooling coagulation of the molten steel cooled to the low temperature at the top.

The thickness of the spacer bar is determined by the size of the upper and lower gaps of the network, and the thickness of the spacer bar can be changed according to the functional condition of the sealing.

The sealing member of the present invention has a conventional metal chip having a predetermined thickness on a concave and convex portion of a dummy bar head which flows into a mold of a continuous casting apparatus and draws out and guides the solidified cast steel of the first molten steel, and the three-dimensional network is placed thereon. The sealing member is mounted at a predetermined height.

When mounting the sealing member, the net of the sealing member is mounted under the condition that the horizontal flat array is maintained, and on the bottom side of the dummy bar, a sealing member of a smaller size is placed first, and a sealing member of a larger size is placed on the upper side. .

Here, the sealing member of a large size means that the thickness of the expander metal material is made thicker, and the sealing of a small size means that the thickness of the expander metal material is thinner.

When the sealing member is mounted on the dummy bar and molten steel is injected into the mold through the immersion nozzle of the tundish, the injected hot molten steel flows downward while being flatly dispersed on the upper side of the sealing. Since the network is supported, dispersion and filtration functions are maintained without deformation collapse caused by hot molten steel. Subsequently, as the molten steel passes through the space of each layer of the sealing member, the fluid resistance is added by the zigzag-shifted netholes to buffer the impact and reach the metal chip by repeated dispersing, filtration, cooling of the mold and the sealing member. Before the sealing member and the molten steel is solidified, the cast and the sealing member are integrated. And the molten steel contained in the space of the upper mold of the sealing member is solidified in the form of a mold cross section is formed into a slab on a large plate.

Subsequently, the cast slag solidified on the dummy bar as the roller is driven is drawn out with the dummy bar, and is cooled by spray coolant in the process of moving between the upper and lower rollers, and when the predetermined bar is reached, the dummy bar is separated from the slab by the automatic separator. The raised and cooled slabs continue to be cut to the desired length in the automatic cutter.

When the dummy bar is separated from the slab, since the metal seals stacked on the dummy bar are integrated with the slab, the metal chips that are not in contact with molten steel are not swept away and are stacked and dispersed as a dispersion on the surface of the dummy bar head. Is done well.

Therefore, the problem that the solidification angle of the slab is torn at the time of separating the dummy bar as in the related art is eliminated, and a large amount of the cast can be continuously produced in a safe state efficiently.

In addition, since the sealing member of the present invention is constructed by welding the reticular body and the spacer bar in one piece, it is easy to handle transportation and does not use special technical properties for mounting, so that anyone can use it, and thus there is an easy handling of manpower.

Therefore, it is designed to be used more safely and conveniently than the conventional separation means of the dummy bar.

1 is an overall perspective view of a conventional continuous casting device

Figure 2 is a perspective view cut away a part showing a mold and a dummy bar of a conventional casting machine

Figure 3 is an exemplary view showing a state in which the metal chip for separating the cast strips on the dummy bar head.

Figure 4 is an exemplary view showing a state using a conventional spring-like core as a sealing

5 is a side view illustrating a portion of a conventional copper cutaway

Figure 6 is an illustration of a seal used in the dummy bar of the present invention

Figure 7 is a side view of the present invention

8 is a plan view of the present invention

9 is an exemplary view showing a state of use of the sealing of the subject innovation

10 is a plan view of the same method of the present invention.

Figure 11 illustrates the working state of the seal of the present invention

Figure 12 is a side view of a cut part of the present invention

[Code Description of Important Parts of Drawing]

1: sealing, 1m: reticular body, 1h: mangong, 1e: expender metal,

1b: spacer bar, M: mold. B: dummy bar, H: head, ch: metal chip,

S: molten steel, N: nozzle, C; core

In the sealing member applied to the head (H) of the dummy bar (B) for drawing out the guide (S) introduced into the mold (M) of the continuous casting device, as shown in Figs. A rectangular reticular body 1m of Expanded Matl 1e and a plurality of spacer bars 1b (three in FIG. 6) each having a round bar between the reticular bodies 1m are horizontal and vertical. They are arranged alternately at regular intervals, and a plurality of upper and lower metal meshes (6 in FIG. 6) are integrally welded to form a three-dimensional network sealing member 1 in which the network holes are distributed in a vertical zigzag.

In addition, the material of the reticular body 1m on the upper side (a) side of the sealing member 1 is thicker and the net hole 1h is larger, and the material of the reticular body 1m on the lower side (b) side of the sealing member 1 is Thinner and the net 1h is arranged smaller and denser.

The spacer bars are welded by placing them horizontally and vertically to support the deflection of the reticulated body weakened by the hot molten steel in a horizontal state, and to provide the drop impact by adding the dispersion, filtration, cooling function and fluid resistance of the molten steel through the net. To maintain good buffering.

The width and length of the sealing member 1 made of a rectangular mesh is preferably at least a size that can be accommodated in the space of the mold M, and is preferably composed of various sizes of sealing to be applied to various types of molds.

In the present invention, as shown in Figs. 9 to 10, a predetermined metal chip (ch) is laid on the head (H) of the dummy bar (B) introduced into the lower opening of the mold (M), The sealing member 1 is mounted at a predetermined height so that the network 1m is horizontal. Here, the predetermined height refers to a height at which molten steel injected into the mold can be cooled and integrated with the sealing member before reaching the lower metal chip.

In addition, the mounting of the sealing member 1 is carefully carried out so that the metal chip (ch) laid on the head (H) of the dummy bar (B) is not dispersed. Originally, the shape of the dummy bar head is bent up and down and left and right to engage with the cooling slab of the molten steel like a kind of hook, so that the sealing member 1 having a small size is disposed so that the metal chips on the uneven portion are not dispersed. It is preferable to mount on the side first, and then mount the sealing member 1 of a larger size on the upper side. When the hot molten steel poured into the mold and the seal come into contact with each other, the heat can be cooled somewhat quickly by the sealing. It is to maintain the filtering function of the molten steel without the deformation collapse of the sealing member withstand the load of the molten steel.

The mounted lower side sealing member, even though relatively small in size, is already buffered significantly by imparting fluid resistance to the flow of molten steel by the net of the upper side sealing member, and thus receives less pressure and is cooled to a lower temperature. On the side, the sealing member is suitable for integral solidification by final cooling of the molten steel.

Thus, the sealing member 1 is mounted on the dummy bar B in the mold N, and molten steel S is introduced into the mold M through the immersion nozzle N of the tundish as shown in FIGS. 11 and 12. Injected molten steel (S) is in contact with the upper sealing member (1) of the mold (M) in the initial high temperature state in a plane dispersed through the mesh 1h of the plurality of reticular bodies (1m) and the spacer bar (1b) Cooling endotherm of the cooling means and the sealing member (1) provided in the mold (M) while repeatedly dispersed while passing sequentially through the network 1m of the next layer through the space of the upper and lower network (1m) maintained by the When the molten steel reaches a lower sealing member 1 by the action, the molten steel becomes a solidified state with almost lost fluidity, and the sealing member 1 mounted inside the mold M before reaching the metal chip ch. It solidifies in unification with.

In addition, the metal chip (ch) laid on the head (H) of the dummy bar (B) is not directly swept as in the prior art because the fluid pressure of the molten steel does not directly affect the surface of the dummy bar head. Therefore, the metal chip is distributed between the sealing integrally fused with the slab and the surface of the dummy bar surface to prevent fusion of molten steel on the dummy bar and maintains good separation of the dummy bar.

Therefore, according to the conventional continuous casting process, the molten steel in the mold is continuously formed in the cross-sectional shape of the mold while the dummy bar B guides the casted piece with the driving of the roller and passes between the upper and lower rollers at a set speed. When the molded bar reaches the predetermined position, the dummy bar (B) is separated by the automatic separating device and is raised above the moving trajectory so as not to interfere with the movement of the cast, and the cast cast continues to be prescribed by the automatic cutting machine. It is cut to the length of and transported by the table roller to the collecting cabinet.

The present invention is composed of a sealing member 1 of a plurality of three-dimensional meshes of upper and lower layers formed by a plurality of rectangular meshes 1m made of X-pender metal and a plurality of spacer bars 1b made of round bars. It is easy to handle and easy to mount because of its solid structure and simple structure.

In addition, the material of the upper (a) side reticle (1m) of the sealing member 1 is thick and the net hole (1h) is larger, and the material of the lower (b) side of the sealing member (1) side (1m) is thinner. Since the net hole 1h is small and densely formed, the sealing member has a good ability to cope with the hot molten steel introduced into the mold.

In addition, when the sealing member is in contact with the molten metal, the sequential dispersing and cooling of the molten metal by the sealing member is repeatedly maintained and the reinforcing effect by the spacer bar prevents the sagging of the reticular body, thus preserving the filtration function. It is buffered by imparting a fluid resistance to the flow of the melt by the network of the. As a result, the molten steel solidifies integrally with the sealing member before reaching the metal chip without directly reaching the metal chip coated on the dummy bar, thereby maintaining good separation of the dummy bar.

In addition, the sealing member of the present invention can be applied to the dummy bars of various continuous casting devices, high stability against the separation of the dummy bars, and prevent accidents in operation, so that the cast members can be continuously and efficiently produced in large quantities in large quantities. There is.

Claims (2)

In the sealing member applied to the head (H) of the dummy bar (B) for drawing out the guide (S) introduced into the mold (M) of the continuous casting device, a plurality of rectangular meshes (1m) and these meshes (1m) A plurality of spacer bars (1b) made of round bars are alternately arranged at regular intervals in the horizontal and vertical directions, and a plurality of upper and lower metal meshes (1m) are integrally welded so that a plurality of meshes are zigzag arranged vertically. Sealing member for a dummy bar of a continuous casting machine, characterized in that the sealing member (1) of the network body. The material thickness of the mesh 1m on the upper side (a) of the sealing member 1 and the size of the net hole 1h are the materials of the mesh 1m on the lower side (b) of the sealing member 1. And a dummy bar sealing member of a continuous casting machine, characterized in that formed relatively thicker and larger than the net (1h).