JPH0659528B2 - Start method for continuous casting of thin strips - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to casting by a thin strip continuous casting apparatus having a moving cooling wall of a drum type, a belt type, etc., and relates to a method of starting the thin strip continuous casting. .

[Conventional technology]

FIG. 3 is a schematic side view showing the start of continuous casting in a twin-drum type continuous casting apparatus which is an example of a conventional thin strip continuous casting apparatus having a moving cooling wall, and FIG. 4 is an enlarged perspective view of the main part thereof. Is.

As shown in FIGS. 3 and 4, when casting a strip steel having a thickness of 3 mm, for example, a strip-shaped dummy having a width equal to the length of the cooling drum A, such as a thickness of 0.6 mm, is used. The upper end of the plate 1 is cut out at three points in a trapezoidal shape, and heat-resistant heat insulating plates 2 having a plate thickness of 1.2 mm, for example, are attached to both lower surfaces thereof
The dummy drum 1 is inserted into and sandwiched between both cooling drums A, and the other end portion (right side in the figure) of the dummy plate 1 is fixed to the winding device E with a gap of both cooling drums 3 being 3 mm.

Next, the molten steel 3 is poured from the tan ditch C into the molten metal pool portion including the pair of cooling drums A and the pair of side dams B supported by the bearing 10, and when the molten steel 3 reaches the notch in the tip of the dummy plate 1, heat-resistant heat insulation is performed. At the same time as it is stopped by the plate 2 and starts cooling and solidification, the cooling drum A is rotated as shown by the arrow, and is wound by the winding device E while moving to the right in FIG. 3 by the dummy plate 1 and the pinch roll D, Then, the steel strip guided by the dummy plate 1 is wound into a coil.

[Problems to be solved by the invention]

When starting such continuous casting, it is desirable to start the rotation of the cooling drum A immediately after the lower portion of the molten steel 3 is solidified and fixed to the dummy plate 1. However,
In the past, since it relied on the intuition of the operator, there was a problem that the start was too early or too late, the dummy plate 1 came off when the strip was drawn, and the molten steel 3 excessively solidified upward. Atsuta

〔Purpose〕

It is an object of the present invention to provide a starting method for continuous casting of thin strips which eliminates the above-mentioned conventional drawbacks.

[Means for solving problems]

That is, according to the present invention, the lower portion of the hot water pool portion, which is composed of a pair of moving cooling walls and side dams, is closed by a dummy plate that guides the thin strip plate, and the molten metal is supplied to the hot water pool portion. In the method for activating a thin strip continuous casting apparatus for activating a thin strip plate together with the dummy plate, an electric insulating plate is provided on both surfaces of a tip portion of the dummy plate, and the electric insulating plate is provided between the moving cooling walls. And closing the lower part of the hot water pool part, and detecting that the tip of the dummy plate and the moving cooling wall are electrically connected by the molten metal supplied to the hot water pool part. A method for activating a thin strip continuous casting apparatus, characterized by activating a moving cooling wall.

〔Example〕

FIG. 1 is a schematic side view showing the start of the continuous casting,
FIG. 2 is an enlarged perspective view showing a state in which a dummy plate is mounted on the lower portion of the basin shown in FIG. The same members as those of the conventional device are designated by the same reference numerals, and the duplicate description will be omitted.

In FIGS. 1 and 2, reference numeral 1a denotes a dummy plate head, which is attached to the tip of the dummy plate 1 with a heat-resistant adhesive via an insulating plate 9, and has heat-resistant insulation on both lower surfaces of the notch of the dummy plate head 1a. The plate 11 is attached. 1
Reference numeral 2 is a starter connected to a cooling drum driving device (not shown), which is connected to the bearing 10 by an electric wire 8a, and the tip of the other electric wire 8b is fixed to the dummy plate head 1a by a clip 7. Has been done.

Insert the dummy plate head 1a into the bottom of the pool,
Both cooling drums A move laterally so as to have a predetermined gap, and the dummy plate head 1 is inserted through the heat-resistant insulating plate 11.
Hold a.

Piezoelectricity is applied to the dummy plate head 1a and the cooling drum A,
When molten steel 3 is poured from Tandishushi C to the pool,
The cooling drum A and the dummy plate head 1 are reached by reaching the dummy plate head 1a protruding to the lower part of the pool.
A is short-circuited, and the starter is energized and activated via the bearing 10 and the electric wires 8a8b to start the rotation of the cooling drum A. At the same time, the molten steel 3 poured into the pool is cooled by the cooling drum A, and the dummy plate head 1a is cooled.
Is fixed to the front end of the sheet to form thin strip steel, which is guided by the dummy plate 1 and fed downward.

The electric wire 8b descends together with the dummy plate head 1a, but when the other fixed electric wire 8b is pulled by the dummy plate head 1a, the electric wire 8b naturally separates from the dummy plate head 1a together with the clip 7. In addition, in FIG.
Is a single-phase electric wire.

〔The invention's effect〕

As described above in detail, the present invention uses the cooling drum and the dummy plate head as electrodes, and short-circuits both of them by the molten metal poured into the pool to start the moving cooling wall. This has the effect of making it possible to automatically start the main continuous casting. In addition, the starting method of the present invention does not require a large-scale device, and the automatic starting mechanism of the moving cooling wall can be easily installed, which is particularly effective when the thickness of the thin strip is small.

[Brief description of drawings]

FIG. 1 is a schematic side view showing the start of a twin-drum type continuous steel strip casting apparatus as an embodiment of the present invention, FIG. 2 is an enlarged perspective view of an essential part of FIG. 1, and FIG. FIG. 4 is a schematic side view showing the starting time of the conventional apparatus, and FIG. 4 is an enlarged perspective view of the main part of FIG.

Claims (1)

[Claims] 1. A dummy plate for guiding a thin strip plate is closed at the bottom of a hot water pool portion consisting of a pair of moving cooling walls and side dams, and molten metal is supplied to the hot water pool portion to move the moving cooling wall. In a method for starting a thin strip continuous casting apparatus which is activated to pull out a thin strip together with the dummy plate, an electrical insulating plate is provided on both surfaces of a tip portion of the dummy plate,
The electrically insulating plate is disposed between the moving cooling walls to close the lower part of the basin, and the molten metal supplied to the basin causes electric discharge between the tip of the dummy plate and the moving cooling wall. The method for activating a continuous thin strip casting apparatus is characterized in that the moving cooling wall is activated by detecting that the strip is continuously connected.