JPH0620599B2 - Casting method in horizontal continuous casting - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a casting method in horizontal continuous casting which enables stable and reliable casting.

[Prior Art] Conventionally, as a horizontal continuous casting apparatus, as shown in FIG. 4, one in which an orifice plate 2 and a mold 3 are arranged in front of a tundish 1 is known. When casting is performed using such an apparatus, a closed space is formed by the inner peripheral surface of the mold 3, the front surface of the orifice plate 2 and the rear end surface of the starting block 4, and the starting pin 5 is placed in the closed space. After positioning, the melt from the tundish 6
Is flowed into the closed space, the molten metal is solidified to some extent, and then the starting block 4 is pulled out from the mold.

[Problems to be Solved by the Invention] In the above conventional method, since a part of the closed space is constituted by the inner peripheral surface of the mold, the molten metal 6 introduced into the closed chamber is solidified near the inner peripheral surface of the mold 3. Get up early, starting block 4
When the metal is pulled out of the mold 3, the molten metal solidified in the vicinity of the inner peripheral surface of the mold 3 adheres to the mold 3, and that portion cannot follow the movement of the pulling out of the starting block 4, and breakout may occur. Therefore, it is very difficult to pull out the starting block 4.

The present invention improves on this point and makes it possible to easily pull out the starting block without fear of breakout.

[Means for Solving the Problems] The present invention provides a starting block with a recessed portion that is provided on the mold side of an orifice plate that is provided between a molten metal outlet of a tundish and a mold, and that has a recessed portion that surrounds the orifice outlet. The concave portion is brought into contact with the front surface of the orifice plate in the mold to form a closed space, and the starting pin is positioned at a position outside the orifice outlet in the space, and then melted into the space from the tundish through the orifice. Is flowed in, and then the starting block is drawn out from the mold together with the molten metal solidified in the closed chamber space, which is a casting method in horizontal continuous casting.

Since the length of the orifice plate changes depending on the type of alloy to be cast, it is preferable that the orifice plate be replaceable.
Also, although a plurality of orifices are provided, the positions of the orifice and the starting pin should not overlap. Further, lubricating oil is allowed to spread on the outer periphery of the recessed portion of the orifice plate.

[Operation] In the present invention, the solidification of the molten metal starts from the portion in contact with the starting block and the starting pin, and the solidified molten metal has no portion in contact with the mold.

[Example] An example will be described with reference to the drawings.

1 to 3 show an apparatus suitable for carrying out the present invention. FIG. 1 is a vertical sectional front view, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 is an orifice plate. It is a perspective view. Portions having the same names as those of the conventional device shown in FIG. The orifice plate 2 is provided with a plurality of orifices (4 in the figure) 7 and a concave portion 8 is provided on the front surface.
Is provided. Reference numeral 9 in the drawing denotes a lubricating oil passage. Lubricating oil flowing therethrough passes through a large number of radial grooves 10 provided around the front surface of the orifice plate 2 shown in FIG. Cast between the inner surfaces of
Lubricate the starting block 4 and the outer periphery of the ingot.
A cooling water passage 11 jets cooling water to the outer periphery of the ingot to cool it.

At the time of casting, the rear end surface of the starting block 4 contacts the entire surface of the orifice plate 2 to form a closed space. At this time, the starting pin 5 is
It should be located outside the 7 exit. The molten metal 6 is made to flow from the tundish 1 into the closed space 12 through the orifice 7. The solidification of the molten metal 6 starts from the part in contact with the starting block 4 and the starting pin 5, and the solidification of that part is rapid, and the range becomes the part shown as a mist in the closed space 12 in FIG. 1 and solidifies. There is no linear contact with the melt. After waiting for a certain solidification time, the starting block is pulled out from the mold and continuous casting is started.

EFFECTS OF THE INVENTION According to the present invention, the solidification of molten metal starts from the portion in contact with the starting block and the starting pin, and there is no molten metal solidification portion in contact with the mold. The phenomenon of being unable to follow the movement of the touching block does not occur. Therefore, since breakout does not occur, stable and reliable casting can be performed.

[Brief description of drawings]

1 is a sectional view of an apparatus suitable for carrying out the present invention, FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is a perspective view of an orifice plate, and FIG. 4 is a sectional view of a conventional apparatus. Shown respectively. 1 …… Tandishyu 2 …… Orifice plate 3 …… Mold, 4 …… Starting block 5 …… Starting pin, 6 …… Molten metal 7 …… Orifice, 8 …… Recessed portion 9 …… Lubricant passage, 10… … Radial groove 11 …… Cooling water passage, 12 …… Sealed space

Claims (1)

[Claims] 1. A recessed portion is provided on a mold side of an orifice plate provided between a molten metal outlet of a tundish and a mold, and a recessed portion is provided over a range surrounding the outlet of the orifice, and a starting block is provided on a front surface of the orifice plate in the mold. Abutting them to make the recessed part a closed space, position the starting pin at a position outside the orifice outlet in the space, then let the molten metal flow into the space from the tundish through the orifice, and then the closed chamber. A casting method in horizontal continuous casting, characterized in that the starting block is pulled out from the mold together with the molten metal solidified in the space.