JPH0413451A - Injection nozzle for molten metal and manufacture of fine metal wire using this - Google Patents

Abstract

PURPOSE:To prevent involution of gas and to manufacture a fine metal wire without any internal defect by arranging a cover for surrounding circumference of jet of molten metal to tip part, from which the molten metal is injected, in an injection nozzle for molten metal. CONSTITUTION:A cup-shaped covering part 5, which is formed so as to cover the nozzle part 2 apart from tip part of the nozzle part 2 and has a hole 5a having diameter (d) for passing through molten metal at the bottom part, is formed at tip part of crucible part 12. This covering part 5 is arranged so that the distance between the tip part of injection nozzle for molten metal and the tip part of covering part 5 becomes (l). That is, by covering the tip part of injection nozzle for molten metal, the involution of gas in gas stream caused by the cooling liquid layer formed with the rotated cylindrical drum and centrifugal force is prevented, and the development of gas holes in the metal fine wire is prevented.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a molten metal injection nozzle for producing a thin metal wire by injecting molten metal as a jet and solidifying it, and a method for producing a thin metal wire using the same. Regarding.

[Conventional technology] One of the rapid solidification methods is spinning in a rotating liquid.

In this method, a cooling liquid layer is formed in a rotating cylindrical drum by centrifugal force, molten metal is injected as a jet into this cooling liquid layer, and the metal is rapidly solidified in the cooling liquid layer. Manufacture thin wire (i.e., JP-A-55-649)
This method is reported in Publication No. 48).

FIG. 2 is a diagram showing the configuration of an apparatus used to carry out a conventional method for manufacturing thin metal wires.

In FIG. 2, the conventional thin metal wire manufacturing apparatus includes a cylindrical drum 51 with an open side, a rotating shaft 52 having one end at the center of the other end surface of the cylindrical drum 51, and a rotating shaft 52 that is rotatable. It has sliding bearings 53, 53 that are supported by the slide bearings 53, 53.

Further, on the other end side of the shaft 521-1 facing the drum 51, there is a belt pulley (not shown) fixed to this shaft 52, and a V belt (not shown) attached to this belt pulley and rotated by a DC motor. It has a shaft drive section 56 equipped with. Furthermore, an outflow prevention plate 54 having a surface protruding toward the central axis is provided on the edge of the drum 51, and a cooling liquid that forms a cooling liquid layer 55 inside the drum 51 is supplied from one end side of the drum 51. A liquid supply vibrator (not shown) is also provided.

The cooling liquid supplied into the drum 51 forms a cooling liquid layer 55 having a liquid surface along the inner peripheral surface due to the centrifugal force of the rotation of the drum 5. A support portion 57 with one end inserted is provided in the opening on one end side of the drum, and a portion extending downward from the one end of the support portion 57 is provided with a plurality of rollers so as to be movable in the horizontal direction. It is fixed to a supported support.

Furthermore, a molten metal injection nozzle 60 is provided at one end of the support portion 57. The molten metal injection nozzle 60 is
a crucible portion 62 around which a heating coil 61 is provided;
It has a nozzle part 63 provided at the tip of this crucible part. Argon gas introduction pipe 6 communicating with this crucible part 62
A jet 58 of molten metal is ejected from the nozzle section 63 by the argon gas pressure supplied from the introduction section 69 connected to the nozzle section 63 . The operation of the apparatus having such a configuration will be explained. When the rotation of the drum 51 reaches a predetermined value due to the rotation of the rotating shaft 52, cooling liquid is injected into the inner surface of the drum 51 via a cooling pipe such as water by a liquid supply vibrator (not shown). The injected liquid forms a cooling liquid layer 55 due to centrifugal force, and is also blocked by the outflow prevention plate 54.
The cooling liquid is prevented from flowing out from the open side of the drum 51.

Then, molten metal 58 obtained by remelting the metal ingot into this cooling liquid layer 55 is injected as a molten metal jet at an appropriate speed from a molten metal injection nozzle 60 to produce a thin metal wire.

Note that the drum 51 is a gap (not shown) provided in the wall.
It is cooled by passing a cooling liquid inside.

According to these methods, thin metal wires with a circular cross section and excellent properties can be easily obtained, the cooling rate can be increased, and they are suitable for manufacturing amorphous metals or fine crystalline metal wires. It is said that

FIG. 3 is a cross-sectional view showing a molten metal injection nozzle structure for melting a metal or alloy as a raw material and ejecting it as a jet when manufacturing fine metal wire by the conventional rotating liquid spinning method.

In FIG. 3, a crucible part 62 for charging a predetermined amount of a master alloy having a predetermined composition, a flange part 65 attached to an inert gas introduction part, and a crucible part 62 for heating and melting the master alloy in the crucible part 62 are shown. It is made of metal and includes an inlet 66 for introducing an inert gas and applying pressure to the molten metal, and a nozzle part 63 for spraying the pressurized molten metal as a jet. The jet of molten metal enters a rotating cooling liquid layer 55 on the inner wall of the cylindrical drum and solidifies to form a thin metal wire.

FIG. 4 is a diagram showing the operation when manufacturing a thin metal wire using the apparatus shown in FIG. 3.

In FIG. 4, a molten metal jet 58 of molten metal 59 is ejected from a molten metal injection nozzle 60 provided with a high frequency coil 61 for metal melting onto a cooling liquid layer 55 formed by centrifugal force due to rotation of a cylindrical drum, Fine metal wires can be easily obtained.

[Problems to be Solved by the Invention] However, in the above-described device, the molten metal jet 58 injected from the nozzle connects to the cylindrical drum 51 rotating in the direction shown by the arrow 66 and the cooling liquid formed by centrifugal force. Due to the gas flow 67 created by the layer 55, the gas is entrained in the molten metal jet and cooled.
Gas holes were generated inside the obtained thin metal wire, which caused a significant decrease in mechanical strength.

Therefore, the technical problem of the present invention is to provide a molten metal injection nozzle that can stably produce a thin metal wire without generating gas holes inside the thin metal wire formed by a rotary spinning method, and a method for producing a thin metal wire using the nozzle. The purpose is to provide a manufacturing method.

[Means for Solving the Problem] According to the present invention, in a molten metal injection nozzle for injecting molten metal as a jet, for surrounding the periphery of the molten metal jet injected at the tip portion that injects molten metal. A molten metal injection nozzle is obtained, characterized in that it has a covering of.

According to the present invention, the molten metal is injected as a jet from the molten metal injection nozzle into a cooling liquid layer formed in a rotating cylindrical drum, solidified into a fine metal wire. A method for manufacturing is obtained.

That is, when a thin metal wire is manufactured using the molten metal injection nozzle according to the present invention, a thin metal wire with a uniform cross section can be obtained.

In the present invention, the metal raw materials used for the molten metal include alloys, and lead, copper, iron-nickel alloys, titanium-nickel alloys, etc. can be used as the metal raw materials, but the thin metal wires to be formed can be manufactured in a timely manner by combining it with a cooling medium, and is not limited to the type of metal.

[Example code] Hereinafter, the present invention will be specifically explained with reference to Examples.

FIG. 1 is a longitudinal sectional view showing the configuration of a molten metal injection nozzle according to an embodiment of the present invention.

In FIG. 1, the molten metal injection nozzle includes a crucible part 1 for melting the metal raw material, a nozzle part 2 for injecting the molten metal, and a nozzle part 12 for charging the metal raw material into the crucible part 12 and for introducing argon gas. It has an inlet 3 and a flange 4 for attaching the molten metal injection nozzle to an inert gas inlet (not shown).

At the tip of the melting portion 12, there is a cup-shaped cover portion 5 which is formed apart from the tip of the nozzle portion 2 to cover the nozzle portion 2 and has a hole 5a with a diameter d at the bottom through which the molten metal passes. It is formed. This cover portion 5 is provided so that the distance from the tip of the molten metal injection nozzle to the tip of the cover portion 5 is 1.

A specific example of manufacturing a thin metal or alloy wire using the injection nozzle according to the embodiment of the present invention will be shown below.

The apparatus for manufacturing metal wire has the same structure as the conventional example shown in FIG. 3 except for the molten metal injection nozzle.

Example].

The drum 1 shown in FIG. 2 is a rotating drum with an inner diameter of 500+niφ, and the cooling liquid layer 9 has a depth of 20I.

Using a device using water at a temperature of 0°C, Pb, Fe45%N
100 g of each of Ti and 55% Ni (wt%) were melted in the air at a temperature 50°C higher than the melting point in the atmosphere, and the molten metal was melted at a speed of 430 m/min by controlling the argon gas pressure. Diameter shown in 15C1μm, ]-4mm,
It was injected from the molten metal injection nozzle of d-3■.

The rotation speed of the drum at this time was 500 m/min.

For comparison, a conventional spinning nozzle with a diameter of 150 μm as shown in FIG.

The number of gas holes inside the obtained lead wire was measured. The results are shown in Table 1. However, the number of gas holes in the table is a value obtained by measuring the number of gas holes in a cross section of 20 cm in the longitudinal direction of an arbitrary portion of the obtained wire.

Table 1 shows that when the molten metal injection nozzle according to the example of the present invention is used, a thin metal wire without gas holes and without internal defects can be obtained. In other words, by covering the tip of the molten metal injection nozzle, gas is prevented from being entrained by the gas flow caused by the rotating cylindrical drum and the cooling liquid layer formed by centrifugal force, and gas holes are generated in the thin metal wire. This shows that it plays a major role in preventing this.

Thereby, in the rotary spinning method, by using the nozzle according to the embodiment of the present invention in which the tip of the molten metal nozzle is covered, it is possible to produce a thin metal wire without internal defects.

[Effects of the Invention] As explained above, according to the present invention, since the tip of the molten metal injection nozzle is covered in the rotary spinning method, gas flow due to the gas flow during spinning is prevented. It is possible to provide a molten metal injection nozzle that can prevent entrainment and produce a thin metal wire without internal defects, and a method for producing a thin metal wire using the molten metal injection nozzle.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the configuration of a molten metal injection nozzle according to an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of an apparatus used to carry out a conventional method for manufacturing fine metal wire, and FIG. When manufacturing thin metal wires using the conventional spin-in-spinning method,
FIG. 4 is a cross-sectional view showing the structure of a molten metal injection nozzle for melting a raw material metal or alloy and ejecting it as a jet. FIG. 4 is a diagram showing the operation when manufacturing a thin metal wire using the apparatus shown in FIG. 3. In the figure, 1... crucible part, 2... nozzle part, 3...
Introduction port, 4... Flange, 5... Hole, 5a... Cover portion, 51... Cylindrical drum, 52... Rotating shaft, 5
3... Bearing, 54... Outflow prevention plate, 55... Cooling liquid layer, 57... Support part, 58... Molten metal jet, 60... Molten metal injection nozzle, 61...・Heating coil, 62... Crucible part, 63... Nozzle part,
64... Argon gas introduction pipe, 66... Arrow indicating the rotation direction of the cooling liquid layer, 67... Arrow indicating the direction of gas flow within the drum opening. Figure 3 Figure 4

Claims (1)

[Claims] 1. A molten metal injection nozzle for injecting molten metal as a jet, characterized by having a cover for surrounding the periphery of the jet of molten metal injected at the tip of the molten metal injection nozzle. Molten metal injection nozzle. 2. A method for producing a thin metal wire by injecting molten metal as a jet from a molten metal injection nozzle into a cooling liquid layer formed in a rotating cylindrical drum and solidifying the molten metal, in which the molten metal injection nozzle is A method for manufacturing a thin metal wire, characterized in that the molten metal injection nozzle according to claim 1 is used.