JPS6036851B2 - Methods for continuous and semi-continuous casting of metals - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for continuous or semi-continuous casting of metal by an electromagnetic casting method in which a metal drop is cooled and solidified while being held by electromagnetic force.

Conventional electromagnetic casting is the first method of casting metal.
As shown in the figure, the molten metal in the tundish is supplied into the electromagnetic field below through the float 2, and the magnetic field of the induction coil 3 causes the molten metal to flow down while being held in a cylindrical shape, thereby solidifying the resulting coin coin 4. (1) Cooling water 5 is supplied to a certain surface and a solidified surface to cool and solidify the surface. At this time, the head pressure of the molten metal is kept constant by the float 2, but this float part does not have a large cross-sectional area, so this head is likely to fluctuate due to fluctuations in the amount of molten metal supplied, especially when the diameter of the mirror block is small. In some cases, not only the head becomes susceptible to fluctuation, but also the float may become unusable.

The present invention has been made to solve these problems, and uses a siphon system to supply the metal drop into the electromagnetic field from the tundish, and adjusts the head pressure of the molten metal in the electromagnetic field from the tundish side. By doing so, the intended purpose was achieved.

Furthermore, the present invention provides a first method of supplying metal port hot water when molten metal is supplied by the siphon method as described above, by attaching a cap-shaped container to the tundish side of the siphon pipe, and attaching a cap-shaped container to the tundish into which the molten metal is flowing. The siphon pipe is filled with molten metal by submerging the cap-shaped container until it touches the bottom of the cap-shaped container, and applying pressure inside the cap-shaped container with an inert gas.Then, the tundish is lowered, and the cap-shaped container is filled with molten metal. By setting the interior to atmospheric pressure, the object of the present invention is more advantageously achieved.

The present invention will be explained below with reference to embodiments shown in the drawings.

Example As shown in FIG. The molten metal in No. 1 tundish 6 is transferred to No. 1 through float 7. Pour into 2 tundishes 8.

This No. 2. In the tundish 8, sink the siphon pipe 10 with the cap-shaped container 9 attached until the closed end of the container 9 touches the bottom of the tundish 8, and the outlet on the other side of the pipe 10 is directly above the electromagnetic force generating coil 11. to be located.

Next, a valve 12 provided on a pipe leading to the inside of the container 9 is opened, and a gas inert to the molten metal, such as N2 gas, is injected to apply pressure to the inside 13 of the container 7, filling the pipe 0' with the molten metal 14. The molten metal is caused to flow onto the coil 11.

The molten metal 14 flowing onto the coil 11 is held in a cylindrical shape by the electromagnetic force of the coil 11, and is cooled and solidified by the cooling water from the cooling device 15 to obtain a mirror block 16. When the molten metal 14 starts to flow onto the coil 11 in the above, as shown in FIG. 2. While gently lowering the container 8 by several centimeters, the interior 13 of the container 9 is opened to the atmosphere.

As a result, the head pressure of the molten metal in the coil 11 reaches No. 2
Since the molten metal level is equal to the molten metal level in the tundish 8, by increasing the liquid level in the tundish 8, the coil 1
It is possible to stably produce coin coins with a uniform diameter by keeping the molten metal level in the chamber stable.

As described above, according to the method of the present invention, the molten metal is supplied from the tundish to the coil located on the side of the tundish using a siphon method, and the level of the molten metal within the electromagnetic field of the coil is adjusted to ensure that the level of the molten metal is sufficiently adjusted. Since it can be carried out on the large tundish side, it has the advantage that the level of the molten metal on the coil side is very stable.

Furthermore, since it is not necessary to use a float for adjusting the liquid level in an electromagnetic field, it is possible to advantageously manufacture small coin coins. Furthermore, in the method of the present invention, as a first method of supplying molten metal, a cap-shaped container is attached to the tundish side of the siphon pipe, and the cap-shaped container is submerged until it touches the bottom of the tundish filled with lacquer water. By applying pressure inside the container to fill the siphon pipe with molten metal, and then lowering the tundish to bring the inside of the shade-shaped container to atmospheric pressure, the molten metal in the tundish was adjusted continuously and stably from then on. It can be supplied to the coil side under head pressure, which is extremely advantageous in terms of work management. In this case, if a fixed tundish is further connected to the movable tundish via a float, the head pressure of the port hot water on the tundish side can be constantly maintained at a constant level. It has great industrial value.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the conventional electromagnetic casting method, and FIGS. 2 and 3 are explanatory diagrams of the electromagnetic casting method of the present invention. 6...No. 1 Tandish (Fixed Tandish), 7...Float, 8...No. 2 tundish (movable tundish), 9...shade-shaped container, 1
0... Siphon pipe, 11... Coil, 12...
...Valve, 13...Inside of container 9, 14.
...Metal molten water, 15...Coil, 16.
... coin lumps. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] 1. In a metal casting method by electromagnetic casting in which molten metal is cooled and solidified while being held by electromagnetic force, the molten metal in a tundish is supplied into an electromagnetic field by a siphon method, and the molten metal is cooled and solidified within the electromagnetic field. Continuous or semi-continuous metal production, characterized in that the head pressure of the molten metal is adjusted on the tundish side, and the molten metal supplied within this electromagnetic field is solidified into an ingot while being held in a predetermined shape by the magnetic field of an induction coil. Method for casting. 2. In a method of casting metal by electromagnetic casting, in which the molten metal is cooled and solidified while being held by electromagnetic force, the molten metal is supplied from the tundish into the electromagnetic field using a siphon method, and as the first method of supplying the molten metal. Attach a cap-shaped container to the tundish side of the siphon pipe, submerge it until it touches the bottom of the tundish filled with molten metal, and apply pressure with an inert gas inside the cap-shaped container to cool the inside of the siphon pipe. filled with molten metal,
A method for continuous or semi-continuous casting of metal, which is characterized in that the tundish is then lowered and the inside of the cap-shaped container is brought to atmospheric pressure.