JPS60121044A - Production of metallic wire - Google Patents

Abstract

PURPOSE:To stabilize the flow of a molten metal and to produce easily a metallic wire having a uniform wire diameter in the stage of extruding a molten metal from a spinning port and solidifying said metal to form a metallic wire by passing the molten metal in a high frequency magnetic field in the stage when the molten metal flow does not complete yet the solidification. CONSTITUTION:Pressure P is exerted to the molten metal 1 contained in a vessel 5 and is extruded in the form of molten metal flow 4 from a lower spinning port 6. Alternating high-frequency current I1 is passed to a high-frequency coil 7 provided around the molten metal flow 4 in the unstable stage when said metal flow does not complete yet the solidification right after the extrusion. The coil 7 creates a high-frequency magnetic field H around the fluid and generates eddy current I2 in the flow, thereby stabilizing the molten metal fluid 4 to a uniform wire diameter. The frequency and electric power thereof are adequately selected according to the kind, wire diameter, etc. of the fluid 4 and the penetration depth of the current I2 is made preferably <=1/5 the outside diameter of the fluid 4.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a wire manufacturing method for manufacturing a metal wire by spinning it from molten metal.

(Background technical assistance) Traditionally, thin metal wires have been processed using a processing method based on casting, hot working, and cold working. Of course, there are batch types, continuous types, etc., and efforts have been made to improve efficiency.

However, this method requires casting machines, rolling mills, wire drawing machines, heat treatment furnaces, etc., and also requires large equipment to cast and process large-sized items, requiring huge capital investment and manufacturing. Requires area. In addition, since large-sized items are manufactured and processed, heating for hot working and intermediate heat treatment when the degree of cold working is required is required.
Since there is a lot of cooling and processing energy is large, there is a drawback of large energy loss. Moreover, when the number of steps is increased, there is a drawback that a large amount of loss occurs during the steps. Furthermore, since processing such as wire drawing is required, it has been difficult to manufacture using hard-to-process wires.

Therefore, as a countermeasure to this problem, a so-called rapid solidification method has been proposed in which a long product of a desired final size is obtained by directly rapidly solidifying the molten metal. One method is to supply a fixed amount of molten metal to a rotating metal roll and rapidly solidify it, and this method is beginning to be used in the industrial production of tape materials. However, this method has drawbacks such as the inability to produce wire rods with circular cross-sections.

Also, as shown in Fig. 1, it is called the melt spinning method, in which a pressure P is applied to the molten metal 1 to create a jet stream 2 of the molten metal in the atmosphere, atmospheric gas, or fluid, without using a mold. There is a way to solidify it.

However, in this method, unlike organic fibers, the jet flow 2 of molten metal is unstable due to surface tension, viscosity, specific gravity, etc., and it is easy to break as shown in the figure, making it difficult to manufacture metal wires of uniform diameter industrially. They have not necessarily been successful in obtaining successive results.

As a method to solve this problem, as shown in Fig. 2, there is a method (called the Taylor method) in which the molten metal l and the highly viscous glass tube 3 softened by heating are drawn out in one place and solidified. Proposed.

However, this method essentially consumes glass;
It was necessary to remove the glass after the wire was made, so it could not be said to be suitable for industrial production.

(Disclosure 2 of the Invention) The present invention was made in order to solve the problems of the above-mentioned melt spinning method, and it stabilizes the molten metal fluid with a magnetic field and easily produces a metal wire with a uniform wire diameter. The purpose is to provide a method.

The present invention is based on a method of manufacturing a metal wire by extruding molten metal from a spinning thread 1 and solidifying it.The molten metal flow is made to pass through a high-frequency magnetic field before solidification is completed, thereby stabilizing the molten metal flow. This is a method of manufacturing metal wire characterized by the following.

The metal wires manufactured by the method of the present invention are Cu and Ag.

It is a wire made of metals such as Ag r Au, or alloys thereof. Conventionally, the jet flow was likely to be unstable with Cu and Aj', which had particularly high purity, but by applying the method of the present invention, stable production is possible. . Furthermore, according to the present invention, in addition to ordinary crystalline metal wires, amorphous gold wires can be formed by using suitable cooling conditions.
% (amorphous metal) wire is also possible.

Next, the mechanism of the present invention will be explained.

As shown in FIG. 3, when an alternating high frequency current 11 is passed outside the molten metal fluid 4, a magnetic field H is created around it, and an opposite phase eddy current 2 is induced in the molten metal fluid 4.

The interaction between the magnetic field H and the eddy current I2 causes an electromagnetic force F that follows Fleming's left-hand rule as shown in the figure on the right. The electromagnetic force F that stabilizes the molten metal fluid 4 without disturbing it is best to act on the surface layer of the molten metal fluid 4, so that the penetration depth of the eddy current I2 depends on the type of molten metal fluid 40 and the wire diameter. The frequency of the alternating high frequency current ■1 is selected to be appropriate. The penetration depth of this eddy current (2) is preferably less than % of the outer diameter of the molten metal fluid. %, there is a possibility that the effect on stabilizing the molten metal fluid will be small.

The thickness of the electromagnetic force F is also determined by the molten metal density, etc., and this is determined by the alternating high frequency current 1. It is adjusted by the current value.

Hereinafter, the present invention will be explained by examples using the drawings.

FIG. 4, FIG. 5, and FIG. 6 are longitudinal cross-sectional views for explaining embodiments of the method of the present invention, respectively. In the figure, there is j,
A pressure P is applied to the molten metal 1 contained in the container 5, and it is extruded as a molten metal fluid 4 from a lower nozzle section (spinning 1 piece) 6. At an unstable stage where the solidification is not completed immediately after the molten metal fluid 4 J'll+ is discharged, a high frequency coil 7 is provided around the molten metal fluid 4 J'll+. As described above, this high-frequency coil 7 creates a high-frequency magnetic field around the metal fluid 4, generates eddy currents in the metal fluid 4, stabilizes the molten metal fluid 4 to a uniform wire diameter, and rapidly solidifies it. The frequency and power can be appropriately selected depending on the type of molten metal fluid 4, the wire diameter, etc.

FIG. 4 shows a case where the molten metal fluid 4 is cooled in the atmosphere, Ar, N2, or other atmospheric gas.

In FIG. 5, a molten metal fluid 4 is cooled in a liquid 8 such as water, and a high frequency coil 7 is provided within the liquid 8.

In FIG. 6, a liquid 8 such as water overflows and flows down in a cooling vibe 9 in a laminar flow 5, and a molten metal fluid 4 passes through a laminar flow 8' and is cooled. The frequency coil 7 is provided outside the cooling pipe 9. Such a laminar flow is effective in further stabilizing the molten metal fluid and brings about good results.

As shown in Figures 4 to 6, by rapidly cooling the molten metal fluid 4 in a high-frequency magnetic field, the molten metal fluid is stabilized and solidified by cooling while maintaining a uniform wire diameter, so that the wire diameter is uniform. A long metal wire can be easily obtained.

(Jitsukata Example 1) Electrical aluminum was melted, and by the method shown in Figure 4, the molten aluminum was ejected into the atmosphere within a high frequency magnetic field at argon gas pressure P, and solidified.
An aluminum linear body having a wire diameter of 00 μm with little variation was obtained. The frequency of high frequency coil 7 is 1000KHz
Met.

(Example 2) - Electrolytic copper was melted, and the molten steel was ejected at argon gas pressure P into a high-frequency magnetic field in a laminar water stream and solidified using the method shown in Figure 6. A copper wire-shaped body having a wire diameter of 100 μm with little variation was obtained. The frequency of the high frequency coil 7 was 3000 KHz.

(Effects of the Invention) The metal wire manufacturing method of the present invention configured as described above has the following effects.

(a) In the melt-spinning wire manufacturing method from molten metal, the molten metal flow is passed through a high-frequency magnetic field before solidification is completed, so that the interaction between the eddy currents generated in the J layer of the molten metal flow and the magnetic field is The electromagnetic force exerted on the surface layer solidifies the molten metal flow in a stabilized manner, making it possible to produce metal wire with a uniform diameter compared to the conventional melt-spinning wire-making method that does not use a magnetic field. It will be done.

In particular, even unstable molten metal flows can be stabilized by the high-frequency magnetic field, making it possible to directly manufacture round wires of uniform diameter from molten metals and alloys.

(b) Since wire can be made by directly spinning molten metal with simple equipment, it is possible to save energy, reduce waste material loss, and downsize equipment compared to the conventional casting → hot working → cold working method.
Manufacturing costs are lower.

(c) In the conventional melt spinning wire making method that does not use a magnetic field, the wire diameter naturally fluctuates depending on the nozzle diameter, etc., but also the flow rate (pressure force),
However, in the method of the present invention, the wire diameter can be easily controlled by varying the strength of the high-frequency magnetic field, and the wire diameter can be easily controlled. Compared to the method, there is no need for complicated operations such as consuming glass or removing glass, so work management is easy and workability is good.

[Brief explanation of drawings]

FIGS. 1 and 2 are longitudinal cross-sectional views for explaining examples of the conventional direct wire manufacturing method, respectively. FIG. 3 is a diagram illustrating the mechanism of the method of the present invention. FIG. 4, FIG. 5, and FIG. 6 are longitudinal cross-sectional views for explaining embodiments of the method of the present invention, respectively. 1 ・Molten metal, 2 ・Jet stream, 3 Glass tube, 4
... Molten metal fluid, 5 container, 6 nozzle part (spinneret)
, 7. High frequency coil, 8. Liquid, 8' fluid, 9. Cooling pipe, F electromagnetic force, H magnetic field, I. High frequency current, I2.
Eddy current. ``1 leap, 2 figures, P, 4 figures, 5 pieces, 3 pieces, 6 pieces.

Claims (4)

[Claims] (1) In a method of manufacturing metal wire by extruding molten metal from a spinneret and solidifying it, the molten metal flow is stabilized by passing it through a high-frequency magnetic field before solidification is completed. Characteristic metal wire manufacturing method. (2) The frequency of the high-frequency current that creates the high-frequency magnetic field is selected such that the penetration depth of the eddy current in the molten metal fluid is below the tip of the outer diameter of the metal fluid. Method of manufacturing metal wire. (3) Claim 1 or 2 in which the molten metal flow passing through a high-frequency magnetic field passes through a laminar cooling fluid.
Method for manufacturing metal wire described in Section 1. (4) The method for manufacturing a metal wire according to claim 1, 2 or 3, wherein the metal wire is an amorphous metal wire.