JPS63180348A - Method and apparatus for continuously casting metallic strip - Google Patents

Abstract

PURPOSE:To continuously cast a metallic strip having optional strip width under stable condition by arranging side weir over from a side face of one side cooling roll shifted mutually toward axial direction to a circumferential face of the other cooling roll and vibrating these toward circumferential direction. CONSTITUTION:Molten metal supplied into a space between one pair of cooling rolls 1, 2 arranged to parallel is rapidly cooled and solidified and passed through the roll gap to obtain the metallic strip. In the above production method, the cooling rolls 1, 2 are arranged as shifting mutually toward the axial direction. Further, the side weirs 3, 3 over from the side faces 1a, 2a of one side cooling rolls 1, 2 to the circumferential face 2b, 1b of the other roll 2, 1 are arranged to form the molten metal pool 4. Then, the length L between the side weirs 3, 3 is set to length corresponding to the strip width of aimed metallic strip. Further, the side weirs 3, 3 are vibrated toward the arrow mark circumferential direction along the above circumferential faces 1b, 2b. In this way, the sticking of solidified shell is prevented and the stable casting for a long time can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method and apparatus for continuously casting a metal ribbon without solidified matter adhering to a side weir that contacts a cooling roll.

[Conventional technology]

2. Description of the Related Art There is a so-called twin-roll continuous casting device that pours molten metal such as molten steel onto the surface of a cooling roll and continuously casts it into a thin strip. As shown in Japanese Patent Application Laid-Open No. 57-94456, such a continuous casting apparatus is one in which one cooling roll is movable in the axial direction relative to the other cooling roll on the same plane. It is known that a side weir is provided from the side surface of one cooling roll to the circumferential surface of the other cooling roll.

In this type of continuous casting apparatus, the width of the molten metal pool formed between the pair of rolls can be adjusted to the desired width of the ribbon product by changing the amount by which the cooling rolls are shifted from each other. Therefore, products of various sizes can be manufactured using one device.

[Problem that the invention seeks to solve]

When manufacturing a metal ribbon using this type of continuous casting apparatus, the molten metal solidifies on the surface of the side weir to form a shell. This solidified shell moves downward as the cooling roll rotates, but receives a large reduction blade near the kissing point and tends to spread laterally. Therefore, the side weir receives a force that pushes it out laterally, and the position of the side weir relative to the cooling roll changes from the set value.

For example, on the side surface of the cooling roll, a gap widens between the side surface and the side weir, and pouring hot water into that gap can lead to enlarged casting burrs and dangerous situations such as leakage. Further, on the circumferential surface of the cooling roll, side weirs are displaced in the lateral direction, making the width of the product, the metal ribbon, unstable.

In this regard, in JP-A-60-170559,
It is disclosed that a side weir that abuts the side surface of the cooling roll is oscillated. This proposal aims to produce a metal ribbon with a constant width by arranging a pair of cooling rolls without shifting them in the axial direction, and forming a molten metal pool by providing a side weir across the side of the face cooling roll. ing. With such a roll arrangement, by swinging the side weir in the horizontal direction, it is possible to prevent the adhesion of coagulum.

However, in a device in which a side weir is provided between one cooling roll and the other cooling roll so that the width of the metal ribbon as a product can be adjusted,
It is not possible to employ a vibration imparting mechanism such as that shown in Japanese Patent Application Laid-Open No. 60-170559.

In addition, since the side weir shown in the publication is one that can be swung horizontally, it promotes pouring of hot water into the gap between the cooling roll and the side weir, and the occurrence of cast burrs increases with casting time. As a result, it becomes difficult to ensure stable casting for a long time.

Therefore, the present invention aims to eliminate the influence of the solidified shell that occurs near the side weir in a continuous casting machine that combines a pair of cooling rolls so that the width of the product can be freely adjusted. The purpose is to manufacture thin metal strips.

[Means for solving problems]

In order to achieve the object, the continuous casting method for metal thin strip of the present invention is to rapidly solidify the molten metal supplied into the space between a pair of cooling rolls arranged in parallel, and to pass the metal thin strip through the gap between the rolls. When manufacturing the strip, the axial positions of the cooling rolls are shifted from each other and a side weir is provided from the side surface of one cooling roll to the circumferential surface of the other cooling roll so that the width corresponds to the desired width of the metal ribbon. A molten metal pool is formed, and the side weir is vibrated in the circumferential direction along the circumferential surface of the cooling roll.

Further, the apparatus for carrying out this method has one cooling roll facing the other cooling roll movably in the axial direction on the same plane, and having a side surface shape along the circumferential surface of the cooling roll. The present invention is characterized in that a side weir is arranged from the side surface of one cooling roll to the circumferential surface of the other cooling roll, and a vibration imparting mechanism is provided for vibrating the side weir along the circumferential surface of the cooling roll.

〔Example〕

Hereinafter, the features of the present invention will be specifically explained using examples with reference to the drawings.

FIG. 1 is a perspective view showing the main parts of the continuous casting apparatus used in this example.

In this continuous casting apparatus, one cooling roll 1 is disposed parallel to the other cooling roll 2 on the same plane. The other cooling roll 2 can be moved in its axial direction, thereby making it possible to adjust the distance between the side surface 1a of one cooling roll l and the side surface 2a of the other cooling roll 2 as appropriate. Moreover, this cooling roll 2 is arranged so as to be close to or apart from the cooling roll 1,
As a result, the gap d (see FIG. 2) between the surface cooling rolls 1.2 is adjusted.

The side surface 1 of one of the cooling rolls 1.
A side dam 3 is provided extending from the peripheral surfaces 1b, 2b of the other cooling roll. The side weir 3 includes a surface portion that contacts the side surfaces 1a and 2a of the cooling rolls 1 and 2, and an end surface that contacts the peripheral surface portions 1b and 2b. In this way, the circumferential surface 1b of the cooling roll 1.2,
A space surrounded by 2b and the side 13 is created, and a molten metal pool 4 is formed by pouring molten metal into the space from above.

The portion of the molten metal pool 4 that comes into contact with the cooling roll 1.2 is cooled and becomes a solidified shell 5 as shown in FIG. This solidified shell 5 is moved in the direction of the roll gap 6 by the rotation of the cooling roll 1°2. In the process of this movement, the solidified shell 5 grows, and the cooling roll 1,
2 to form an integral ribbon 7.

At this time, the widthwise end of the molten metal pool 4 is located at the side + [13
However, due to heat radiation through the side weir 3, a solidified shell is formed in the portion facing the side 13. Since the side weir 3 is vibrated along the circumferential direction of the cooling rolls 1 and 2, this solidified shell does not connect the slabs, and the slab ends are torn off, causing breakage and breakout of the slab. can be prevented from occurring. Furthermore, by making the side weir vibrate in the circumferential direction of the cooling roll, compared to the conventional method (horizontal direction), the amount of hot water flowing into the gap between the side weir and the cooling roll is reduced, and the increase in cast burrs is suppressed. Enables long casting.

FIG. 3 is a diagram showing an example of a mechanism for imparting circumferential vibration to this side weir 3. The side weir 3 is pressed against the cooling roll body surface and side surface with a constant surface pressure by a hydraulic cylinder 7 and a cylinder 8.

Further, the hydraulic cylinder 7 is connected to a vibration device (not shown), and swings the side weir 3 in the circumferential direction of the roll.

The vibration to be applied to the side t[I3 is appropriately selected in relation to the casting speed, but usually mechanical vibration with an amplitude of about 100 Hz and a frequency of 1 to 100 Hz can be used. Furthermore, ultrasonic vibration is also effective in providing similar effects.

〔Effect of the invention〕

As explained above, in the present invention, since vibrations are applied to the side weir along the circumferential direction of the cooling roll,
The solidified shell is prevented from sticking to the gap where the side weir contacts the circumferential surface and side surface of the cooling roll. Therefore,
Since the gap between the side and circumferential surfaces of the cooling roll and the side weir can be maintained at the set value, molten metal will not intrude into the gap and cause burrs to become large or the edges of the cast metal ribbon to be There are no defects such as tearing or even leaking water. In this way, according to the present invention, it is possible to produce a metal ribbon under stable conditions over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the main parts of a continuous casting apparatus according to an embodiment of the present invention, Fig. 2 illustrates the state in which a metal ribbon is manufactured from molten metal, and Fig. 3 shows the equipment installed in the apparatus. An example of a vibration imparting mechanism is shown below. Patent applicant New Japan! ! Representative of Iron and Steel Co., Ltd.
Masu Kobori (and 2 others) Figure 1 Figure 2

Claims (1)

[Claims] 1. When manufacturing a metal ribbon by rapidly solidifying a molten metal supplied to a space between a pair of cooling rolls arranged in parallel and passing it through a gap between the rolls, the molten metal is rapidly solidified in the axial direction of the cooling rolls. By mutually shifting the positions and providing side weirs from the side of one cooling roll to the circumferential surface of the other cooling roll, a molten metal pool corresponding to the width of the desired metal ribbon is formed, and the side weirs are connected to the cooling rolls. A continuous casting method for a thin metal strip characterized by vibrating it in the circumferential direction along the circumferential surface of the metal ribbon. 2. One cooling roll is movably opposed to the other cooling roll on the same plane in the axial direction, and a side weir having a side surface shape along the circumferential surface of the cooling roll is installed from the side of one cooling roll. 1. A continuous casting apparatus for metal ribbon, characterized in that a vibration imparting mechanism is provided, which is disposed over the circumferential surface of the other cooling roll, and vibrates the side weir along the circumferential surface of the cooling roll.