JPS5927754A - Nozzle for producing light-gage amorphous alloy strip - Google Patents

Abstract

PURPOSE:To provide a stable halfway cutting method for a light-gage strip by making the communication passage between the well part of a nozzle communicating with a tundish through a charging gate and a suction pipeline freely openable and closable. CONSTITUTION:A charging gate 2 is provided in the opening part 2' communicating with the well part 7 of a nozzle 3 in the bottom part of a tundish 1. A gate 4 for removing is provided freely rotatably in the well part 7, and a communicating hole part 5 is engraved therein. The one end of the part 5 opens in the part 7 and the other end in the nozzle 3 and opens in a communication hole 6 communicated with a tank sucked under a negative pressure by means of a pipeline, respectively. Molten metal is charged into the tundish 1 upon completion of preparation, and when the molten metal attains a prescribed head, the gate 2 is opened to start charging the molten metal. The gate 2 is closed where the shape and quality stabilize. At the same instant, the gate 4 is rotated to withdraw a part of the molten metal in the well part 7, whereafter the gate 4 is rotated to interrupt the communication with the tank kept under the negative pressure. The molten metal through a nozzle slit 8 is then sucked and the light- gage strip under the production is cut.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a nozzle for producing an amorphous alloy ribbon.

A liquid quenching method has been proposed as a method for producing amorphous alloy ribbons (・).In particular, the single roll method is suitable for mass production of plates (・
It is evaluated that Molten metal is poured onto the surface of a quenching roll that rotates at a high speed of usually about 20-30 pn/sec through a nozzle slit of about 1 mm or less, and is produced by quenching. Since the rolls have to be rotated at high speed from the beginning of pouring, the ribbon comes flying out from the tip at high speed. Due to adsorption of moisture or dirt on the surface of the quenching roll, or because the optimum roll temperature is still reached during normal operation,
A length of several tens of meters at the tip is usually poor in shape and quality, and trouble often occurs when the winder catches the tip.

In order to solve this problem, a method can be considered that after manufacturing several tens of meters of the tip, it is cut after the shape quality has stabilized, and then the winder catches it and starts winding. law has been studied.

For example, a method has been tried in which a rubber roll, which has a peripheral speed higher than that of a quenching roll, is brought into instantaneous contact with the surface of the ribbon being manufactured, and the molten metal (paddle) directly below the nozzle slit is used to tear it off. There is also a method in which after the ribbon is peeled off from the quench roll, a high-speed jet is applied, the ribbon is pulled at high speed, and the paddle section is used to tear it off.

However, since the cutting time is short, this tearing method does not require very strict control of the timing of the winding machine's capture, or the trailing end of the cut may still be captured, causing trouble and causing problems. The relative movement between the ribbon and the surface of the quenching roll during this process often damages the surface of the quenching roll made of copper alloy, which is commonly used at °C, and reduces the commercial value of the subsequent ribbon. 0 The present invention solves these problems and provides a stable halfway cutting method.That is, the present invention provides a pouring gate at the communication port of the nozzle connected to the tumbler push with the tumbler push, and The present invention provides a nozzle that is provided with a suction pipe that communicates with a molten metal reservoir of the nozzle, and in which the communication passage between the nozzle and the suction pipe can be freely opened and closed.

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

An opening 2' communicating with a nozzle 3 is provided at the bottom of the tamp push l that receives the pouring of metal from the melting furnace, and a pouring gate 2 for opening and closing the opening 2' is provided. The opening 2' communicates with the molten metal reservoir 7 of the nozzle 3, and the molten metal is passed from the reservoir 7 through the nozzle slit 8 to the quench roll 90.
It erupts into contact with the surface and forms a ribbon.

A drawing gate 4 is rotatably provided in the molten metal reservoir 7, and a through hole 5 is cut into the gate 4. One mouth of the through hole 5 is connected to a nozzle molten metal reservoir 7.
In addition, the other opening opens to the nozzle 3, and opens to the communication hole 6 which communicates with the tank through which negative pressure is sucked. Thus, the molten metal reservoir 7 and the tank can be communicated with each other.

Next, I will explain how to cut a ribbon mid-way using a nozzle with such a structure at °C. After completing the preparations for heating, heating, etc., pour the melt into the tundish 1 and cut it into the specified 1 When you reach the hot water head, open the hot water pouring gate 2 and start pouring hot water. When the shape and quality are stable, usually after 2 to 3 seconds, - Gate 2 is closed. At the same time, the extraction gate 4 is rotated and a through hole 5 is provided in the gate 4;
A part of the molten metal in the molten metal reservoir 7 in the nozzle 3 is drawn out by connecting it to a communication hole 6 provided in the nozzle 3 and connected via a pipe to a tank (not shown) that is suctioned with negative pressure, and then The gate 4 for extraction is rotated to cut off communication with the negative pressure tank. Through this series of operations, the bath water in the molten metal reservoir 7 is reduced, and the molten metal is sucked through the nozzle slit 8, so that the ribbon being manufactured is cut.

If you open the pouring gate 2 again after a predetermined period of time,
A ribbon with good shape and quality begins to come out, and the winder stably captures the tip, eliminating any winding problems.

Examples of the present invention will be described below.

A gate and nozzle made of small body partial graphite with 150mrnXO and 6mrn slit nozzle were installed once a month.

Fe-B-8i-C system Itaniyu at 1300℃, 25m
Water-cooled copper alloy roll rotating at /s 1000cm x 30
The pouring was started at 0 W, the pouring was stopped for 0.5 seconds at 1 mw, and the pouring was restarted, followed by winding with a magnetic mud-trapping type winder.

As a result, it was possible to stably wind up a ribbon with good quality and shape.

[Brief explanation of drawings]

FIG. 1 is a cutaway front view of the nozzle of the present invention. 2: Pouring gate 3: Nozzle

Claims (1)

[Claims] A pouring gate is provided at the communication port of the nozzle connected to the tongue push, and a suction pipe is provided that communicates with the molten metal pool of the nozzle, and the communication passage between the nozzle and the suction pipe is opened and closed. A nozzle for manufacturing amorphous alloy ribbon, which is characterized by being flexible.