JPH0519163Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a side weir for a continuous casting machine equipped with a pair of cooling drums.

[Conventional technology]

Recently, a technology that directly and continuously casts a thin metal strip from molten metal with a thickness of several millimeters, which is close to the final shape, has been attracting attention.

When this technique is used, a hot rolling process is not required, and only a light rolling process is required to form the final shape, so that the process and equipment can be simplified.

A twin drum method is known as one of such continuous casting techniques.

In this method, a pair of cooling drums that rotate in opposite directions are arranged horizontally, and a pool is formed in a space partitioned by a side weir that abuts the side of the pair of cooling drums and the same pair of cooling drums. do. The molten metal contained in the molten metal pool is cooled and solidified at the portion in contact with the cooling drum to form a solidified shell. This solidified shell moves as the cooling drums rotate, and is sent to the roll gap where the pair of cooling drums are closest to each other. Here, the solidified shells formed on the surfaces of the respective cooling drums are pressed together and integrated into a metal ribbon.

[The problem that the idea attempts to solve]

As shown in FIG. 3 and FIG. 4A, which is a cross section taken along line A-A' in FIG. It is equipped with a ceramic seal plate 2 fitted into the corundum 1, a refractory material 3 that supports the corundum 1 from the back, and an iron skin side plate 4 and an iron skin bottom plate 8 made of SS material that wrap around the side and bottom surfaces of the refractory material 3, respectively. . Further, a terminal 5 of a heater 7 passing through the corundum 1 in the lateral direction is attached to the iron skin side plate 4.

When preheating this side weir, curve 1 in Figure 4B
As shown in Figure 3, a high temperature difference occurs in the height direction of the outer skin side plate 4 (front and back direction of the side weir), and the front side of the side weir (drum side, that is, the side facing the molten metal) thermally expands, resulting in the temperature difference shown in Figure 3. A warping deformation occurs in which the front side becomes convex as shown by the dotted line 6 in FIG. 5, which is a cross-sectional view taken along line B-B'.

This high temperature difference in the iron shell side plate 4 is caused by the terminal 5 of the heater 7 being heated by heat conduction from the heat generating part (heater 7) due to its high thermal conductivity, and the side plate 4 near the heater 7 also being heated by the high temperature terminal 5. This occurs because heat from the molten metal flows into the molten metal side of the side plate 4.

When the warping deformation of the side weir as described above occurs,
The ceramic plate 2, which is used to seal the molten metal in contact with a cooling drum (not shown), has a problem in that the upper and lower ends are raised relative to the center, and the molten metal leaks when poured.

The present invention is a twin weir that prevents hot water from leaking by preventing heating of the front side of the side weir (the side facing the molten metal) of the iron skin side plate 4, which is the main cause of warping and deformation during preheating of conventional side weirs as described above. This paper proposes a side weir for drum-type continuous casting equipment.

[Means to solve the problem]

The present invention provides a side weir for a twin-drum continuous casting machine that contacts the sides of a pair of cooling drums arranged in parallel to form a sump. Multiple cavities were created horizontally, and a heating medium was sealed in the cavities.

[Effect]

According to the present invention, when the molten metal side of the iron skin side plate of the side weir becomes high temperature due to the inflow of heat from the molten metal to the molten metal side of the iron skin side plate, the cavity and the heating medium sealed inside the acts as a heat pipe, transporting heat to the opposite or colder side of the side plate, reducing the temperature difference within the side plate. For this reason, thermal deformation of the iron skin side plate, which is the cause of warping deformation of the entire side weir, is prevented.

For example, as a heat pipe, multiple cavities are provided so that the total area ratio is 50% with respect to the cross section of the iron skin side plate, and naphthalene is used as a heat medium in the cavity with a volume ratio of 20% to the cavity volume. (The type of heating medium is 100~
Since it reaches 300 (℃), it is called naphthalene).
At this time, the heat transport capacity of the heat pipe inside the cavity is approximately 3000 times that of a conventional steel shell side plate made of SS material with the same cross-sectional area, so the heat transport capacity of the entire steel shell side plate is also 1500 times greater. The temperature gradient of the side plate is 1/
It will be 1500. As a result, thermal deformation of the iron skin side plate is significantly reduced and does not pose a practical problem.

〔Example〕

A side weir as an embodiment of the present invention will be explained in FIG. 1A with reference to FIGS. 1 and 2. In the same figure, the same parts as the conventional side weir shown in Figs. 3 to 5 are indicated by the same symbols.
The explanation will be omitted.

In this embodiment, in a conventional side weir, a plurality of cavities 11 are provided substantially horizontally in the side plate 4 of the iron shell, and a heat medium is sealed in the cavities 11.

In this embodiment, when a temperature difference occurs between the front side of the side plate 4 on the molten metal side and the back side on the opposite side due to heat from the molten metal on the side plate 4, the cavity 11 and the heat medium act as a heat pipe. The temperature gradient is reduced by transporting heat from the hot front side to the back side.

As a result, as shown by curve 9 in FIG. 1B, the temperature gradient of the steel shell side plate 4 is significantly reduced compared to the conventional one (shown in FIG. 4B). Therefore, in this embodiment, it is possible to prevent the side weir from warping and deforming on the molten metal side, and it is possible to prevent melt leakage from the gap between the drum and the side weir.

[Effect of idea]

According to the present invention, it is possible to eliminate the high temperature difference in the direction from the molten metal side of the iron shell side plate to the opposite side,
This prevents leakage of the metal, eliminates burrs at the ends of the metal band being cast, and improves the quality of the product.

[Brief explanation of drawings]

Fig. 1A is a cross-sectional view of an embodiment of the present invention (corresponding to the cross-sectional view taken along the line A-A' in Fig. 3), and Fig. 1B shows the temperature distribution of the steel shell side plate in the same embodiment. figure,
Fig. 2 is a cross-sectional view of the steel shell side plate of the same embodiment taken along line C-C' in Fig. 1, Fig. 3 is a perspective view of the side weir, and Fig. 4A is a cross-sectional view of the conventional side weir (Fig. 3). 4B is a diagram showing the temperature distribution of the conventional steel shell side plate shown in FIG. 4A, and FIG. 5 is a diagram showing the temperature distribution of the conventional steel shell side plate shown in FIG.
It is a cross-sectional view taken along the line B′. 1... Corundum in contact with the molten metal, 2... Ceramic plate, 3... Refractory material, 4... Iron skin side plate,
5...Heater terminal, 8...Refractory material, 11...Cavity.

Claims (1)

[Scope of utility model registration request] In a side weir for a twin-drum continuous casting equipment that forms a sump by contacting the sides of a pair of cooling drums arranged in parallel, a plurality of almost horizontally arranged side weirs are installed on the side plate of the steel shell that supports the refractories in the side weir. A side weir for a twin-drum continuous casting machine, characterized by having a cavity and enclosing a heat medium in the cavity.