JPH0434993Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a continuous pipe casting apparatus that continuously casts pipes while vertically swinging a mold.

BACKGROUND TECHNOLOGY In a conventional continuous pipe casting apparatus of this type, a mold having pipe forming holes formed through it in the vertical direction is immersed in the molten metal in a tundish and is swung up and down, so that the molten metal is formed. The tube is continuously cast by pulling up the solidified shell formed by cooling on the inner peripheral surface of the tube hole from the tube forming hole. The purpose of swinging the mold up and down is to smoothly pull up the solidified shell and tube from the tube-forming hole.

Problems to be Solved by the Invention However, according to the above-mentioned conventional configuration, the surface of the molten metal ripples due to the swinging of the mold. As a result, the immersion depth of the mold fluctuates, resulting in uneven wall thickness on the inner surface of the cast tube, or droplets of molten metal adhering to the inner surface of the tube and solidifying into particles, or melting into the molten metal. There was a problem in that the gas inside the tube escaped and the surface of the tube became porous.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a continuous pipe casting apparatus that prevents the surface of the molten metal from undulating.

Means for Solving the Problems In order to solve the above-mentioned problems, the continuous pipe casting apparatus of the present invention includes a mold in which a pipe forming hole is formed vertically through the mold and is configured to be swingable in the vertical direction. In a continuous casting device, a wave-dissipating plate placed around the mold is floated on the surface of the molten metal. It is something that

Function In the above configuration, the wave-dissipating plate prevents the surface of the molten metal from undulating around it due to the swinging of the mold.
This prevents the adverse effects caused by the ripples on the molten metal surface that were seen in conventional devices, and also prevents the temperature of the molten metal from decreasing due to heat radiation from the molten metal surface.

Embodiments Hereinafter, some embodiments based on the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows a first embodiment of the present invention. Here, a mold 4 is immersed in the molten metal 3 in the tundish 2 so as to be able to swing up and down, and a wave-absorbing plate 5 is floated on the surface of the molten metal 3 surrounding the mold 4.
The mold 4 has a cylindrical shape, and a tube forming hole 6 vertically passes through the center thereof. The wave-dissipating plate 5 is an annular flat plate made of a molded product made of a heat-insulating refractory material, a metal plate with heat-insulating refractories pasted on both front and back surfaces, or the like.

Next, the operation of the above configuration will be explained. The mold 4 is swung up and down while being immersed in the molten metal 3. When the molten metal 3 is cooled on the inner peripheral surface of the tube forming hole 6, an annular solidified shell 8 is formed. By pulling up this solidified shell 8 from the tube-forming hole 6,
A tube 9 is continuously cast. At this time, since the mold 4 is swung up and down, the tube 9 is pulled up smoothly from the tube forming hole 6. Further, the wave-dissipating plate 5 prevents the surface of the molten metal 3 from undulating around it due to the swinging of the mold 4, and also prevents heat radiation from the surface. Therefore, the problems caused by the undulation of the hot water surface as seen in conventional devices, namely, the unevenness of the wall thickness of the tube 9,
The adhesion of particulate matter to the inner surface of the tube 9 and the porous surface of the tube 9 are eliminated, and the temperature of the molten metal 3 is prevented from decreasing.

FIG. 2 shows a second embodiment of the present invention. In this example, an annular protrusion 11 is formed on the outer circumferential surface of the mold 4, and the wave-dissipating plate 5 is an elastic body 1 such as a coil spring.
A damper 13 is supported by the annular projection 11 via the wave-absorbing plate 5 and the annular projection 11.
is provided, and the other configurations are the same as in the first embodiment. These elastic bodies 12 and dampers 13
This makes the wave-dissipating action of the wave-dissipating plate 5 more effective. Other effects are the same as in the first embodiment.

FIG. 3 shows a third embodiment of the present invention. In this example, the wave-absorbing plate 5 is supported by an appropriate external support 21 other than the mold 4 via an elastic body 12, and a damper 13 is provided between the wave-absorbing plate 5 and the external support 21. There is. Other configurations and effects are similar to those of the second embodiment.

Effects of the invention As described above, according to the invention, the wave-dissipating plate prevents the surface of the molten metal from undulating due to the swinging of the mold, resulting in uneven wall thickness of the cast pipe and grain formation on the inner surface of the pipe. The adhesion of substances and the porous surface of the tube are eliminated. Moreover, since the wave-dissipating plate prevents heat radiation from the surface of the molten metal, a drop in the temperature of the molten metal is prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of a continuous pipe casting apparatus based on the present invention, FIG. 2 is a sectional view showing a second embodiment thereof, and FIG. 3 is a sectional view showing a third embodiment thereof. It is. 3... Molten metal, 4... Mold, 5... Wave-dissipating plate, 6...
...Pipe-forming hole.

Claims (1)

[Claims for Utility Model Registration] 1. A mold having a vertically penetrating hole formed therein and configured to be swingable in the vertical direction is immersed in molten metal, and while the mold is swinging up and down, the above-mentioned 1. A continuous casting apparatus for pipes capable of pulling a formed pipe up from a pipe forming hole, characterized in that a wave-absorbing plate placed around the mold is floated above the surface of the molten metal. 2. The continuous pipe casting apparatus according to claim 1, wherein the wave-dissipating plate is supported by the mold via a damper. 3. The continuous pipe casting apparatus according to claim 1, wherein the wave-dissipating plate is supported by an external support via a damper.