JPS61103652A - Method and device for producing quickly cooled thin strip - Google Patents

Abstract

PURPOSE:To make possible the optimization control of the sectional profile of a quickly cooled thin strip by measuring the clearance at both ends of a pouring nozzle in the axial direction of a cooling roll and adjusting the tilting and lifting of an intermediate containing vessel of a molten metal. CONSTITUTION:The molten metal 8 in the intermediate containing vessel 5 is supplied from the slit-like pouring nozzle 6 to the surface of a cooling roll 7 under rotation and the thin strip 8' consisting of a crystalline or amorphous metal is continuously produced. The clearance (g) between the nozzle and the roll at both ends of the nozzle 6 in the axial center direction of the roll 7 is measured and the vessel 5 is tilted in accordance with the measured result to parallel the nozzle 6 with the surface of the roll 7. The lifting of the vessel 5 is thereafter adjusted to set the clearance (g) to the prescribed value. The stable assurance of the clearance between the nozzle and roll with good accuracy is thus made possible and the optimization control of the sectional profile of the thin strip product is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The techniques described in this specification in connection with the advantageous production of ribbons of amorphous and crystalline rapidly solidified alloys are We are proposing the development results for easily and accurately adjusting the relationship ``t'' of the pouring nozzle to the high-speed rotating p-ru, which determines the pull-fill.

When manufacturing quenched ribbons, in which molten metal is rapidly solidified by flowing it down onto a single cooling roll that rotates at high speed, it is especially important to obtain long alloy ribbons that are in good shape over a long period of time. It is important to set the relative position between the cooling roll and the pouring nozzle.

(Prior art) It is necessary to maintain a constant layer between the pouring nozzle and the cooling roll in order to obtain a ribbon with a good shape, and the distance between the roll and the nozzle, that is, the clearance value has conventionally been set at 0.1 to 1, Qs.
It was extremely small (w+) and required high precision settings. If you keep it, JP-A-57-91854, JP-A-68-18
2866 and other publications state that the above-mentioned clearance should be measured and fed back to maintain the distance between the nozzle and the roll at a predetermined distance, but no specific device or system is indicated. (Problem to be solved by the invention) Generally, this type of pouring nozzle is attached to a high-frequency melting furnace that holds molten metal, and therefore the pouring nozzle is
It is very difficult to approach the cooling roll with a clearance of 111 or less. Furthermore, the width of the nozzle is currently 1
The width of the ribbon is about 00 to 800, which corresponds to the width of the ribbon to be produced, but there is also a strong tendency to expand it to a wider width. The furnace body that holds the pouring nozzle requires the use of hydraulic cylinders, electric motors, etc., and these are all controlled at locations more than several meters Fahrenheit away, so the rolls at both ends of the nozzle are the ones that are actually controlled. The smaller the value of the gap, the more difficult it becomes to control the gap difference toward zero.

(Measure 12 for solving the problem) Therefore, in this invention, in order to bring the control point closer to the drive system,
The nozzle is attached to a molten metal storage container, such as a tundish, and the tundish is rotated according to the difference in clearance between the two ends of the pouring nozzle, and the tundish is rotated to maintain the average roll-nozzle clearance at a predetermined value. He devised a control system for raising and lowering the

In other words, the present invention provides a system in which molten metal JiA8 is rotated at high speed through a slit-shaped pouring nozzle 6 installed at the bottom of an intermediate storage container 5 for molten metal.
The material is supplied to the surface of each cooling roll 7 for rapid solidification,
In a method for continuously manufacturing a thin ribbon 81 of crystalline or amorphous metal, the clearance g between the pouring nozzle 6 and the cooling roll 7 at both ends in the axial direction is measured, and according to the results, The intermediate storage container 5 is tilted to make the pouring nozzle 6 parallel to the surface of the roll 7, and the intermediate storage container 5 is then raised and lowered to set the nozzle-roll clearance g to a predetermined set value. A method for manufacturing a rapidly cooled 'fiJ band, characterized in that the clearance is maintained at a constant level by combining the following steps.

A slit-shaped pouring nozzle 6 for controlling the downward supply of the molten metal at the lower part of the intermediate storage container 5 for the molten metal and this pouring nozzle/
The molten metal is heated in a continuous manufacturing equipment consisting mainly of crystalline or amorphous metal with one cooling plate which receives the molten metal from the I/6 and rotates at high speed to induce rapid solidification of the molten metal. The intermediate storage container r65 includes a rotating shaft 6a that is perpendicular to the axis of the cooling roll 7, and is provided with a rotation tIAW49 that guides the tilting of the intermediate storage container 5 around the rotating shaft 5a and a lifting mechanism noise. This is a unique quenched ribbon manufacturing device.

FIG. 1 illustrates the method for producing a quenched ribbon according to the present invention, and a specific example of a quenched ribbon production apparatus used for carrying out the method.

The molten metal is melted in a high frequency melting furnace 1, and then passed through an injection nozzle 2.
The molten metal is guided into the tundish 5 and allowed to flow down from the pouring nozzle 6 attached to the bottom of the tundish 5 toward the surface of the cooling roll 7 which is rotating at high speed, and after being rapidly solidified, it is formed into a ribbon 8'. is ejected tangentially to the rotation of the cooling p-luer and collected.

At this time, the clearance g between the cooling roll 7 and the pouring nozzle 6
must be kept constant. The difference in clearance g between both ends of the pouring nozzle 6 and the cooling roll, which is often seen in the XX cross section of FIG. , by rotating it with the hydraulic cylinder 9.

On the other hand, since the value of the clearance g at this time is different from the predetermined value, the tundish 5 can now be moved in a direction perpendicular to the low y plane using the lifting hydraulic cylinder 4 to set the predetermined clearance g. Note that these tundishes 5 may be driven by an electric motor.

The method of the invention is shown in detail in FIG.

The clearance g11 g between the cooling roll and the pouring nozzle/I/6 at both ends is measured using a laser displacement meter 11, an optical system such as an image scanner, an eddy current meter, etc., and the hydraulic pressure is measured without inputting it to the calculation unit 1δ through the amplifier 1z. A correction signal that makes Δg zero is sent to the cylinder 9 through the amplifier 14. Thereafter, a correction signal is sent to the lifting cylinder 4 through the amplifier 15 so that the average gap g becomes a predetermined gap g set.

FIG. 8 shows an example of a control block diagram, and each block has a measurement system 16 (roll nozzle gap at both ends &
), calculation unit 18 (clearance difference Δg.

It consists of an average clearance g), a hydraulic drive section 17, and has an independent control system, unlike the elevation control at both ends of the nozzle. Therefore, the pouring nozzle holding section is not mechanically independent but integrated. Nevertheless, the contradiction that the controls are independent is easily resolved.

(Effects of the Invention) According to the present invention, it is possible to secure stable and accurate clearance of the cooling wheel pouring nozzle, and to achieve optimization of the cross-sectional shape and fill of the quenched ribbon product. #I of Queen Clearance can be used and also used for its implementation
tIn can be easily done.

(Practical 1 Fig. 4 (~ is the gap g, when controlling the clearance between the cooling rail and the pouring nozzle according to the conventional method.
1,3 M, g, = o, Is- is measured and tatto,
Based on this signal, both ends of the nozzle are controlled by independent drive systems to a predetermined clearance g set = 0.8 wa.
I tried to get it closer to 1, but due to mechanical constraints due to the difference in drive system spacing and nozzle width, as shown in Figure 4, Is
However, as shown in Fig. 4 Φ), according to this invention, the clearance gl + g of the cooling four-hole/pouring nozzle is first measured, and the difference Δg is calculated. Rotate the tundish to make it zero, and then g 1 to make the predetermined clearance g set.
+ g l (Δg=0) to g get ni? He is dropping off Ndishu. Therefore, it was possible to control the predetermined clearance g set to be constant with a significantly faster response and higher accuracy than in the conventional method. To give a more specific example, the cooling p-ru/pouring nozzle clearance is 0. According to this invention, Q, gm ± 80 μ for sea bream and sea bream with a nozzle width of 100
It is possible to maintain a constant gap with an accuracy of m.
Under the conditions of 140 m 7 g, an amorphous alloy ribbon with a good shape and a thickness of 80 μm and a width of 1 ooss was obtained.

[Brief explanation of the drawing]

Figure 1 is a front view of a device suitable for carrying out the method of this invention, Figure $g is an explanatory diagram of the measurement opening system of this invention, Section 8v! J is a control block diagram of the present invention, and FIG. 4 is a comparison diagram of the results of cooling reel/pouring nozzle clearance control. 1...High frequency melting furnace 2...Pouring nozzle 8...
・Lifting guide・ Sound... Hydraulic cylinder for lifting 5... Tundish Also... Nozzle... Cooling roll 8... Thin strip 9... Hydraulic cylinder for rotation 10... Bearing for rotation Section 11...Four nozzle gap measuring device 12...Amplifier 18...Calculation section 14-...Amplifier
15...Amplifier 16...Measurement section 1
7... Drive section x-X cross section Figure 2
ε

Claims (1)

[Scope of Claims] 1. Molten metal 8 is rotated at high speed from a slit-shaped pouring nozzle 6 installed at the bottom of an intermediate storage container 5 for molten metal.
The material is supplied to the surface of each cooling roll 7 for rapid solidification,
In a method for continuously manufacturing a crystalline or amorphous metal ribbon 8', the clearance g between the pouring nozzle 6 and the cooling roll 7 at both ends in the axial direction is measured;
According to the result, the intermediate storage container 5 is tilted to make the pouring nozzle 6 parallel to the surface of the roll 7, and the intermediate storage container 5 is then adjusted up and down to set the nozzle-roll clearance g to a predetermined value. A method for manufacturing a quenched ribbon, characterized in that the clearance is adjusted and maintained at a constant value by a combination of values and conditions. 2. At the lower part of the intermediate storage container 5 for molten metal, there is a slit-shaped pouring nozzle 6 that controls the flow and supply of the molten metal, and a high-speed rotation mechanism that receives the molten metal from the pouring nozzle 6 and guides its rapid solidification. In an apparatus for continuously producing a crystalline or amorphous metal ribbon, the intermediate storage container 5 for molten metal has a rotating shaft 5a orthogonal to the axis of the cooling roll 7. a rotation mechanism 9 that guides the tilting of the intermediate storage container 5 around the rotation axis 5a;
and an elevating mechanism 4.