JPH05185190A - Production of metal fine wire - Google Patents

Abstract

PURPOSE:To produce a continuous metal fine wire having uniform diameter by preventing disturbance of molten metal jet in the atmosphere in a rotary spinning method in liquid. CONSTITUTION:A cooling liquid layer 5 is formed in a rotating cylindrical drum 1 by centrifugal force and the molten metal jet is jetted into this cooling liquid layer 5 from a spinning nozzle 7 and solidified to produce the metal fine wire. While the molten metal jet jetted from this spinning nozzle 7 enters in the cooling liquid layer 5, this jet is cooled by the atmospheric gas 20. This atmospheric gas 20 contains helium having specific heat larger than that of the liquid in the cooling liquid layer 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing thin metal wires.

[0002]

2. Description of the Related Art In recent years, as a method for producing a thin metal wire having a circular cross section from a molten metal, a generally-known spinning method in a spinning liquid has been proposed, and the technology has been rapidly established.
That is, JP-A-56-165016 and JP-A-57-52
550, JP-A-57-79052, etc., in which a cooling liquid layer is formed by centrifugal force on the circumferential surface of a rotating cylindrical drum, and molten metal is jetted into the cooling liquid layer as a jet. , A method for producing a thin metal wire by rapidly solidifying this is shown. According to these conventional methods, a thin metal wire having a circular cross section or excellent characteristics can be easily obtained, and the cooling rate can be remarkably increased as compared with the conventional method. It has the advantage that it is suitable for producing fine metal wires and the like.
Details of an example of an apparatus for carrying out the conventional method are shown in FIG.
Explained by. In FIG. 2, reference numeral 1 is a drive unit 10.
Reference numeral 3 denotes a bearing that supports the rotating shaft 2, which is a cylindrical drum that is rotated by (hereinafter, simply referred to as a rotating cylindrical drum). The rotating cylindrical drum 1 has a cylindrical shape, and a cooling liquid layer 5 is formed on an inner wall portion 1a of the rotating cylindrical drum 1 by a centrifugal force around the rotating shaft 2 of the rotating cylindrical drum 1. A donut-shaped support plate 4 for holding the depth of the cooling liquid layer 5 is provided at the end. Further, a crucible 6 made of molten metal is provided in the rotary cylindrical drum 1, and a spinning nozzle 7 is formed at the tip of the crucible 6.
The metal flow 8 ejected toward the cooling liquid layer 5 is previously fed to the crucible 6
The metal raw material 9 charged into the inside of the crucible 6 is heated and melted while being supplied in an inert gas atmosphere, and melted from the spinning nozzle 7 at the tip of the crucible 6 by the pressure of the jetting inert gas introduced from the inlet 11 of the inert gas. It is ejected as a metal jet. The jetted metal stream 8 immediately enters the cooling liquid layer 5, is drawn by the inner wall of the rotating cylindrical drum 1 by centrifugal force, and is rapidly cooled to be a thin metal wire. In the drawing, reference numeral 9 is a heating coil, and reference numerals 17 and 18 are supporting portions. Since the thin metal wire is manufactured by the above apparatus and the operating method, it is a very excellent method for directly obtaining the thin metal wire from the molten metal. Further, in this method, it is important to obtain a fine metal wire having a good cross-sectional shape by making the distance between the tip of the spinning nozzle and the cooling liquid as small as possible.

[0003]

However, here, in order to dispose the heating coil 9 as shown in FIG. 2 in the vicinity of the spinning nozzle portion, the distance g (hereinafter, referred to as "the distance g" between the tip of the spinning nozzle 7 and the cooling liquid)
It is difficult to make the gap)
Actually, the minimum length is about 2 to 3 mm. Therefore,
There is little cooling in this gap. As a result, it is possible to obtain a fine metal wire such that the change of the surface tension of the jet of the molten metal becomes extremely unstable, leading to breakage or only a metal wire having a beaded surface texture can be obtained. There wasn't. In addition, since the molten metal jet is hardly cooled before entering the cooling liquid layer, the temperature around the cooling liquid layer into which the molten metal jet jumps gradually rises with the passage of the molten metal spinning time, that is, relatively. Since the amount of heat absorbed is superior, the cooling liquid layer and its liquid surface become unstable and disturbed. In this way, the molten jet cannot maintain a continuous thin wire in the cooling liquid layer when it exceeds a certain temperature. As a result, the obtained thin metal wire is
It seems that we can obtain only those consisting of a very limited amount of continuous lines in the state where there is almost no temperature rise of the cooling liquid layer in the early stage of spinning and a collection of short lines obtained by subsequent spinning. Often occurred. In other words, it has a limited length (actually 1 m,
The actual situation is that only a few tens of grams) have been obtained. As described above, in the conventional method, various problems are caused by not cooling the molten metal jet before entering the cooling liquid layer.

Therefore, the technical problem of the present invention is to solve the above-mentioned drawbacks of the prior art in the rotating submerged spinning method, prevent turbulence in the atmosphere of the molten metal jet, and prevent the continuous thin metal wire having a uniform diameter. To provide a method of manufacturing.

[0005]

In order to solve this problem, in the present invention, a cooling liquid layer is formed in a rotating cylindrical drum by a centrifugal force, and the cooling liquid layer is melted from a spinning nozzle. In a method of producing a fine metal wire by injecting and solidifying a metal jet, it is characterized in that the molten metal jet injected from the spinning nozzle is cooled by an atmospheric gas body before entering the cooling liquid layer. Here, in the present invention, when the atmosphere gas body has a specific heat larger than that of the cooling liquid, for example, helium is used, the specific heat is several times larger than that of other inert gas such as argon. Disturbance of the molten metal that is cooled can be suppressed. This also makes it possible to increase the distance (gap) between the tip of the spinning nozzle and the cooling liquid layer.

In the following embodiment of the present invention,
Although a Ti-Ni alloy is used as the molten metal, the present invention is not limited to these kinds of metals, and it is obvious that the present invention can be applied to any metal material that can be melted by heating.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a cross-sectional view showing one structural example of an apparatus for carrying out the method for manufacturing an alloy thin wire of the present invention. Figure 1
In FIG. 1, the parts having the same names and configurations as those of the conventional example are shown by the same reference numerals, reference numeral 1 is a rotary cylindrical drum by the drive unit 10, and reference numeral 3 is a bearing for supporting the rotary shaft 2. The structure of the rotating cylindrical drum 1 has a cylindrical shape, a cooling liquid layer 5 is formed on the inner wall of the rotating cylindrical drum 1 by a centrifugal force, and the cooling liquid layer 5 is formed at the outer end of the circumference of the rotating cylindrical drum 1. A doughnut-shaped support plate 4 for holding the height is provided. A spinning nozzle 7 is provided at the tip of the crucible 6 made of molten metal. The metal flow 8 ejected from the spinning nozzle 7 toward the cooling liquid layer 5 is formed by melting the metal raw material previously charged into the crucible 6 under the inert gas atmosphere by the heating device. .. The molten metal raw material is jetted as a jet of molten metal from the spinning nozzle 7 at the tip of the crucible 6 by the pressure of the jetting inert gas introduced from the inlet of the inert gas. On this occasion,
The jetted metal stream 8 immediately enters the cooling liquid layer 5 and is drawn by the inner wall of the rotating cylindrical drum 1 by centrifugal force to be rapidly cooled to be a thin metal wire. The above is the same configuration as the conventional example. The difference between the example of the present invention and the example of the prior art lies in the atmospheric gas 20 shown by hatching in FIG. In the embodiment of the present invention, the ambient gas 20 is more absorbed than the specific heat of the liquid forming the cooling liquid layer 5.
It is composed of one having a large specific heat. That is, in the embodiment of the present invention, helium (having a specific heat of about 1.30 cal / deg.g) is used as the atmosphere gas body, and liquid paraffin (about 0.56 cal / deg.) Is used as the refrigerant forming the cooling liquid layer 5. d
eg · g) is used.

Next, a specific example of a method for manufacturing an alloy thin wire according to an embodiment of the present invention will be described.

An apparatus having an inner diameter of 500 mmφ is used as the rotary cylindrical drum 1 shown in FIG. 1, and Ti ₅₀ -Ni ₅₀ (at
%) Alloy from the melting point in an argon atmosphere at 5
430m /
The spinning nozzle 7 is moved in the width direction of the rotating cylindrical drum 1 at a speed of 10 mm / min.
Spinning was performed while reversing at a speed of 2 seconds. The distance between the tip of the spinning nozzle 7 and the cooling liquid layer 5 was 10 mm, and the atmosphere gas body 20 was helium (about 1.30 c
The atmosphere in the rotary cylindrical drum 1 was filled with al / deg.g).
Liquid paraffin (about 0.56 cal / deg · g) was used as a refrigerant for forming the cooling liquid layer 5. The speed of the rotating cylindrical drum 1 at this time was 430 m / min. The obtained metal fine wire had a cross-sectional shape close to a perfect circle, had very few beads, and had a length of about 100 m. This is a remarkable advance compared with the conventional method in which only 1 m long and many beads were observed, and the effect of the cooling liquid for improving the thin wire forming property is improved. It means that the cooling between the gaps as a role is relatively large.

[0011]

As described above, according to the present invention, a cooling liquid layer is formed in a rotating cylindrical drum by centrifugal force, and a molten metal jet is jetted from the spinning nozzle into the cooling liquid layer. In the method for producing a thin metal wire by solidifying and then solidifying the molten metal jet sprayed from the spinning nozzle by the atmosphere gas body before it enters the cooling liquid layer, the cooling liquid body is used as the atmosphere gas body. Since a material having a specific heat larger than that of the liquid in the layer, for example, helium having a specific heat several times larger than that of an inert gas such as argon, is used, it is possible to cool the molten metal more rapidly and suppress the disturbance of the molten metal. it can. Therefore, this makes it possible to lengthen the gap and obtain not only long continuous alloy fine wires with a uniform wire diameter but also effective for application to quenching materials such as long continuous amorphous wires. A manufacturing method can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of an apparatus for carrying out the method for producing an alloy thin wire of the present invention.

FIG. 2 is a diagram showing a configuration example of an apparatus for carrying out a conventional method for manufacturing an alloy thin wire.

[Explanation of symbols]

 1 Rotating Cylindrical Drum 2 Rotating Shaft 3 Bearing 4 Supporting Plate 5 Cooling Liquid Layer 6 Crucible 7 Spinning Nozzle 9 Heating Coil 10 Driving Motor 11 Inert Gas Introducing Pipe 12, 13 Arrows 17, 18 Supporting Part 20 Atmospheric Gas Body

Claims (3)

[Claims] 1. A method for producing a thin metal wire by forming a cooling liquid layer in a rotating cylindrical drum by centrifugal force, injecting a molten metal jet from a spinning nozzle into the cooling liquid layer and solidifying the molten metal jet. 2. The method for producing a fine metal wire according to, wherein the molten metal jet sprayed from the spinning nozzle is cooled by an atmospheric gas body until it reaches the cooling liquid layer. 2. The method for producing a thin metal wire according to claim 1, wherein the atmospheric gas body has a specific heat larger than a specific heat of the liquid in the cooling liquid layer. 3. The method for producing a thin metal wire according to claim 1, wherein the atmosphere gas body contains helium.