JPS6030556A - Continuous casting device for metallic plate - Google Patents

Abstract

PURPOSE:To prevent the solidified shell of a molten metal from entering between the end faces of a pair of cooling rolls and the side gates at the roll ends and hampering the smooth rotation of the cooling rolls with a continuous casting device provided with said rolls and said side gates by curving the inside surfaces of the side gates toward the inside. CONSTITUTION:A molten metal well 3 is formed of a pair of cooling rolls 1, 1 having the same length and same diameter and side gates 2, 2, provided at both ends of the rolls. Both cooling rolls are rotated oppositely from each other and the molten metal is discharged from the spacing between the cooling rolls by which said metal is solidified and is cast continuously. A curved surface having the radius of curvature equal to the radius R of the cooling rolls is provided to the inside surface of each gate 2 in this case and a gate 5 for preventing overflow in attached thereon. Such curved surfaces and gates prevent the solidified shell of the molten metal formed on the inside surfaces of the gates 2 during continuous casting from entering between the end faces of the cooling rolls and the side gates and hampering the rotation of the cooling rolls so that the continuous casting operation is stably accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a continuous metal plate casting device that can stably and continuously cast a spring heat = A4 base metal plate with a healthy internal quality from molten metal such as molten steel. It is related to.

As shown in a schematic vertical cross-sectional view in Fig. 1 and a schematic plan view in Fig. 2, the apparatus for continuously casting metal plates from molten metal such as molten steel has the same length, the same diameter, and the same axis. a pair of adjacent cooling rolls 1' whose surfaces are horizontal and parallel to each other; a driving means (not shown) for rotating the pair of cooling rolls 1' in opposite directions at the same peripheral speed; and a pair of cooling rolls. A device is known which comprises a pair of side weirs 2' for forming a molten metal reservoir 3' in cooperation with the upper half of the outer circumferential surface of each side weir 1'. According to this device, as shown by the arrows in FIG. The metal plates 4' are brought into contact with each other to solidify them, and thus the metal plates 4' can be continuously taken out from the roll gap between the pair of rotating cooling rolls 1'.

However, the above-mentioned casting apparatus has the following problems. That is, the solidified shell formed on the inner surface of the side weir 2' gets between the cooling roll 1' and the side weir 2', and obstructs the smooth rotation of the cooling roll 1'.

This is due to the following reason. That is, the width of the solidified shell formed on the inner surface of the side weir 2' is gradually narrowed as the cooling roll 1' rotates, and as a result, the solidified shell that has nowhere to go is transferred to the cooling roll 1'. and the side weir 2'.

In order to solve the above-mentioned problems, the inventors of the present application have conducted various studies and found that the solidified shell formed on the inner surface of the side weir 2' is connected to the end surface of the cooling roll 1' and the side weir 2'. In order to prevent the solidified shell from entering the space between the two, it is sufficient to release the solidified shell that has no place to go to the cooling roll 1' side. , the molten metal reservoir 3 while being drawn off by the cooling roll 1'
We obtained the knowledge that it is sufficient to keep the outer circumference of the solidified shell formed within ' constant.

The present invention has been made based on the above-mentioned findings, and includes: a pair of cooling rolls having the same length and the same diameter, whose axes are horizontal and parallel to each other, and which are close to each other; a drive means for rotating the cooling rolls in opposite directions at the same circumferential speed; and a drive means provided between the axial ends of the pair of cooling rolls, which cooperates with an upper half of the outer circumferential surface of the pair of cooling rolls. and a pair of side weirs for forming a molten metal reservoir, and each of the pair of side weirs is characterized in that the inner surface of each of the pair of side weirs is curved inward.

One embodiment of this invention will be described with reference to the drawings.

FIG. 3 is a schematic vertical sectional view of an apparatus according to an embodiment of the present invention, and FIG. 4 is a sectional view taken along the line A--A in FIG. 3. In FIGS. 3 and 4, 1 is a pair of cooling rolls. The pair of cooling rolls 1 have the same length and the same diameter, and their axes are horizontal, parallel, and close to each other. ing. The pair of cooling ports are rotated in opposite directions by driving means (not shown). 2 is a pair of side weirs sb,
Each of the pair of side weirs 2 is provided between the axial ends of the pair of cooling rolls l. 3 is a molten metal reservoir formed in the upper half of the outer circumferential surface of the pair of cooling rolls 1 and the pair of side weirs 2. Further, reference numeral 5 denotes a pair of overflow prevention weirs vertically fixed on the pair of side weirs 2, respectively.

Each of the pair of side dams 2 is formed such that its inner surface is curved inward. The radius of curvature R of the inner surface is equal to the radius of the cooling roll l. The reason for doing this is as follows. That is, the length of the minimum interval between a pair of cooling rolls 1 is t
Then, the total circumference length of the solidified shell formed in this part. is expressed as Lo=2(t+b), where b is the distance between the inner surfaces of the lower ends of the pair of side weirs 2.

The total circumferential length of the solidified shell at a position θ away from the minimum distance point is the length of the short side of the solidified shell by 1. If the length of the long side of the solidified shell is t2, then 1, = 2(
t + (R-Rcosθ)) −(υt2= Jb
-(R-R animals θ month...(2) Tonashi, in the end, L-6
1+t2=2(t;+b) (constant) (3).

(As is clear from Equation 4, by forming the side weir 2 in the above-described shape, the total circumferential length of each part of the solidified shell 6 formed in the molten metal reservoir 3 is
All are equal as shown in FIG. Therefore, the solidified shell formed on the inner surface of the side weir 2 is
Even if the width of the solidified shell is narrowed as it is pulled out by the cooling roll 1, the width decrease is on the cooling roll 1 side (
Since the solidified shell moves toward the long side), the solidified shell does not enter between the cooling roll l and the side weir 2.

The inner surface of the side weir 2 does not need to have a radius completely equal to the radius of the cooling roll 1 over its entire length. You can also narrow it down to the inside.

Moreover, as shown in FIG. 6, the inner surface shape of the side weir 2 is as follows.
It may be formed into a concave shape so that the solidified shell 6 formed here can be easily deformed.

As explained above, according to the present invention, it is possible to completely prevent the solidified shell from entering between the cooling roll and the side weir, so that useful effects such as the smooth rotation of the cooling roll can be maintained at all times. brought about.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical sectional view of the conventional device, FIG. 2 is a schematic plan view thereof, FIG. 3 is a front view of the device according to an embodiment of the present invention, and FIG. 4' is the same as that shown in FIG. The sectional view taken along line A-A, FIG.
FIG. 6 is a plan view showing changes in the total circumferential length of the solidified shell, and FIG. 6 is a plan view showing another side weir. In the drawing, l, 1'... cooling roll 2, 2'... side weir 3, 3'
... Molten metal reservoir 4' ... Metal plate 5 ... Overflow prevention weir 6 ... Solidified shell Applicant Natsuo Shioya, agent of Nippon Koukan Co., Ltd. (2 others)

Claims (2)

[Claims] (1) A pair of cooling rolls having the same length and diameter, whose axes are horizontal and parallel to each other, and which are close to each other, and the pair of cooling rolls are moved in opposite directions at the same circumferential speed. a pair of reservoirs provided between the axial ends of the pair of cooling rolls and forming a molten metal reservoir in cooperation with the upper half of the outer peripheral surface of the pair of cooling rolls; The inner surface of each of the pair of side weirs is curved inwardly,
Continuous casting equipment for metal plates. (2) The inner surface of each of the pair of side weirs is curved inward with a radius of curvature that is the same as the radius of the pair of cooling rolls. Continuous casting equipment for metal plates as described in Section 1.