JPH06182507A - Device for casting thin cast billet and use of the device - Google Patents

Abstract

PURPOSE:To avoid troubles in the early stage of casting and to make stable casting operation possible by providing a discharging mechanism with which the unstable part in the early stage of casting is discharged to the outside of system before reaching a peeling mechanism. CONSTITUTION:The discharging mechanism 5 consists of a nozzle 5a with which a defective thin cast billet is peeled from a casting wheel 1 by jetting high-pressure gas, hood 5b with which the thin cast bilt which is peeled from the casting wheel 1 is guided and pulverizer 5c with which the thin cast billet which is guided with the hood 5b is pulverized. Since a thin strip in the early stage after casting is started is peeled, pulverized and removed before reaching the peeling mechanism 2 in the above way, the clogging of nozzle due to insufficient peeling or the like of the thin strip is avoided. And, in the case that coiling is subsequently executed after completing coiling with a coiler 4, the thin strip is supplied to the pulverizer 6 which is arranged on the downstream side of the coiler 4 and can be processed, so stopping the supply of molten metal is not necessitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus suitable for producing ribbons of amorphous alloy and a method of using the apparatus.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 60-21160 and Japanese Unexamined Patent Publication (Kokai) No. 57-57160 disclose a technique of supplying a molten metal onto a cooling roll rotating at a high speed and rapidly solidifying the molten metal to obtain a quenched ribbon.
Many proposals have been made so far, such as the -112956 publication.

[0003]

By the way, the following problems have been encountered in the production of such a ribbon. That is, at the initial stage of casting of the quenched ribbon, the cooling roll was not yet thermally saturated, and the refractory nozzle that continuously supplied the molten metal was also thermally unsaturated, It is unavoidable that the thickness of the ribbon is non-uniform, it cannot be made amorphous, and that the ribbon becomes a mesh due to cracking of the ribbon or inclusion of air. Further, such a ribbon is difficult to peel off from the cooling roll, and even if it can be peeled off from the cooling roll, it causes a partial drop, so that the ribbon is caught between the nozzle and the cooling roll and the nozzle is destroyed. As a result, operational troubles such as the occurrence of an accident occurred and the casting work could not be continuously performed, which was a serious problem. Such an adverse effect occurs even when an operation is mistaken when peeling a healthy ribbon from the cooling roll, and its solution has been desired.

In the conventional ribbon production apparatus, it takes 10 to several seconds from the start of casting until the quality of the ribbon is stabilized when it is cast. Originally, in the casting of such ribbon, the speed is 30 to 40 m. / S and very fast coil length 300 ~
It will be about 600 m. Then, it is difficult to remove all such defective parts from the cooling roll while avoiding clogging of the equipment and discarding them all through the same line as the sound ribbon.

The object of the present invention is to remove the ribbon in the unstable region at the initial stage of casting by normal peeling and discarding it to the outside of the system in advance without passing through the guiding part to peel and induce only the ribbon in the stable region. The present invention is intended to propose a new device that can be wound up and wound up and a method of using the device.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a casting wheel for cooling and solidifying a molten metal under high speed rotation to form a thin cast piece, a peeling mechanism for peeling the thin cast piece from the casting wheel, and a peeled thin thickness. In a device equipped with a winder for winding a cast piece, the above-mentioned apparatus has a discharge mechanism for taking out an unstable portion in the initial stage of casting to the outside of the system before reaching a peeling mechanism. It is a casting apparatus, and in the present invention, it is suitable to dispose a crusher for crushing thin cast pieces at a high speed downstream of the winder. When performing casting operations using the device with the above configuration, when the defective winding of the thin cast piece occurs, the discharge mechanism is activated to take out the thin cast piece on the casting wheel out of the system and wind it. When the preparation is completed, the operation of the discharging mechanism is stopped and the winding of the thin cast piece is restarted, so that the casting operation can be continued without stopping the supply of the molten metal.

[0007]

According to the present invention, a crusher having rotating blades is used to discharge defective parts in the initial stage of casting, which have uneven thickness or are not sufficiently amorphized, to the outside of the system before passing through a normal line. This is intended to be processed, and according to this, it is possible to avoid the stoppage of the line due to the clogging of the defective portion, so that stable operation can be realized. Further, in the present invention, for example, when the winding of the first coil has failed, until the preparation for winding the next coil is completed,
The ribbon is taken out of the system by the discharge mechanism, and when the preparation for winding is completed, the take-out by the discharge mechanism can be stopped and the winding can be performed by the winder, so there is no need to interrupt the casting of the ribbon and the production efficiency can be improved. Can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIG. 1 shows the configuration of the apparatus according to the present invention. In the figure, 1 is a casting wheel for cooling and solidifying molten metal m under high speed to form a thin cast piece, and 2 is a thin casting piece cooled and solidified by the casting wheel 1. The peeling mechanism 2 peels off the thin cast piece from the casting wheel 1 by injecting a high pressure gas.
It has a and a hood 2b. Also, 3 is a pinch roll, 4
Is a winder for winding the thin cast strip that has been peeled off, and 5 is a discharge mechanism for taking out an unstable portion in the initial stage of casting to the outside of the system before reaching the peeling mechanism 2. This discharge mechanism 5 injects high-pressure gas. And a hood 5b for guiding the thin cast piece peeled from the casting wheel 1, and a crusher 5c for crushing the thin cast piece guided by the hood 5b. . Further, 6 is a winding machine 3
It is a high-speed crusher placed downstream of the.

The molten metal m in the holding container 7 is transferred to the tundish 9 via a nozzle 8 arranged on the bottom surface thereof. The molten metal m in the tundish 9 is adjusted by adjusting the flow rate while moving the stopper 11 up and down so that the value is always constant under the weight measurement and level measurement by the bath surface level detector 10. Supplied onto the casting wheel 1. Molten metal flowing out from nozzle 12 m
Is rapidly cooled and solidified on the casting wheel 1 to become a product, but if the plate thickness is too thick at this time, it becomes extremely brittle without becoming amorphous, while if the plate thickness is too thin, holes may form in its surface. It would be torn and it would be clogged with the hood 2b and pinch roll 3 etc. (the peripheral speed on the surface of the casting wheel was very high at 40 m / S), and it was impossible to continue casting the ribbon. is there.

In the present invention, the discharge mechanism 5 peels and grinds the thin strips at the initial stage of casting, so that the thin strips are removed before reaching the stripping mechanism 2. The clogging is completely avoided. Also,
When the winding operation is performed after the completion of the winding operation by the winding machine 4 or when the winding operation fails and the thin ribbon cannot be wound, the ribbon is supplied to the crusher 6 arranged downstream of the winding machine 4. Since it is possible to process the ribbon, it is not necessary to stop the supply of the molten metal, and the ribbon of good quality can be immediately wound after the completion of the winding preparation.

FIG. 2 shows that the device according to the present invention is applied to Fe.
FIG. 4 is a graph comparing the stability of the casting operation in the case where the defective portion was removed in the initial stage of the casting to produce a ribbon of a —B—Si amorphous alloy with the result of the operation without any means. . It is clear that it is possible to dramatically improve the stability of casting by treating the defective part in advance, and it is easy to determine the defective part treatment technology in the casting of thin slabs. Can be imagined.

[0012]

According to the present invention, stable casting operation can be carried out while avoiding troubles at the initial stage of casting.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of an apparatus according to the present invention.

FIG. 2 is a graph showing the results of investigation of stability in casting operation.

[Explanation of symbols]

 1 Casting Wheel 2 Peeling Mechanism 3 Pinch Roll 4 Winder 5 Discharge Mechanism 6 Crusher 7 Ladle 8 Nozzle 9 Tundish 10 Liquid Level Meter 11 Stopper 12 Nozzle m Molten Metal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tohru Sato, 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Inside the Chiba Steel Works, Kawasaki Steel Co., Ltd. (72) Satoshi Suhara, 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Kawasaki Steel Works Co., Ltd. Chiba Works (72) Inventor Katsumi Kurokawa 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Works Chiba Works

Claims (3)

[Claims] 1. A casting wheel for cooling and solidifying molten metal under high-speed rotation to form a thin cast piece, a peeling mechanism for peeling the thin cast piece from the casting wheel, and a winding step for winding the peeled thin cast piece. An apparatus including a machine, wherein the apparatus has a discharge mechanism for taking out an unstable portion in an initial stage of casting to the outside of the system before reaching a peeling mechanism. 2. The apparatus according to claim 1, wherein a grinder for crushing thin cast pieces at high speed is arranged downstream of the winder. 3. When the winding failure of the thin cast piece occurs, the discharging mechanism is operated to take out the thin cast piece on the casting wheel to the outside of the system, and the discharging mechanism is operated at the stage when the preparation for winding is completed. A method of using a casting apparatus for continuously performing casting without stopping the supply of molten metal by stopping and restarting the winding of thin slabs.