JPH0440100B2 - - Google Patents

Description

[Detailed description of the invention] field of invention The present invention relates to a method for manufacturing thin metal wire.

Description of Prior Art Unlike thin wires made of organic fibers, thin metal wires have low viscosity. For this reason, it has traditionally been difficult to spin metal fine wires from their molten state, and they are generally produced through many processes such as casting, hot working, and cold wire drawing. However, in recent years, there has been an increasing demand for thinner metal wires. Along with this, there is a growing momentum to review the unreasonableness of conventional manufacturing methods and to implement direct processing. For this reason, there is increasing interest in melt spinning of metals.

However, some metal melt spinning methods attempted in the past have included various drawbacks or problems. For example, in a method in which molten metal is jetted into the atmosphere as a jet, spinning is difficult because the jet flow is not stable until solidification is complete. Furthermore, in the method of jetting molten metal into still water, the jet is disturbed by the impact on the surface of the still water, making spinning impossible. Therefore, as disclosed in US Pat. No. 3,845,805, a method was proposed in which gravity is used to create a vertical flow of cooling water and molten jet is jetted into this flow. However, even with this method, it is difficult to limit the flow rate or control it to laminar flow, and furthermore, the method of winding the thin metal wire is difficult, so it has not been put to practical use. .

In order to significantly improve these problems,
There is a so-called rotating liquid spinning method disclosed in JP-A-55-64948. In this method, molten metal is jetted as a jet into a cooling liquid layer formed in a rotating drum by centrifugal force, thereby solidifying the molten metal to obtain a thin metal wire. Although this method does solve some of the drawbacks and problems of the various manufacturing methods mentioned above, there is still room for improvement. In particular, it is difficult to wind up long products.

Purpose of the Invention Therefore, it is an object of the present invention to provide a method for manufacturing a thin metal wire that can directly form a metal into a thin wire from its molten state and that can easily wind up the formed thin metal wire. It is.

Structure of the Invention The present invention is directed to forwarding molten metal into a cooling liquid layer placed in a horizontal state as a jet at an angle obliquely intersecting the horizontal plane through the pores of a nozzle supported by rotating struts extending vertically. This is a method for manufacturing a thin metal wire, characterized in that the nozzle is spouted and at the same time the nozzle is rotated backward about the rotating column.

By ``spraying the jet as a jet at an angle diagonally intersecting the horizontal plane'', the vertical impact that the jet receives from the liquid surface can be reduced, which is advantageous for wire production. The angle of incidence into the coolant layer is preferably 30° or less, although it depends on the type of metal, and is particularly preferably smaller for metals with low specific gravity such as Al.

The purpose of "rotating the nozzle backwards around the rotating support" is to reduce the horizontal impact that the jet receives from the liquid surface. Here, if the velocity of the jet is Vj, the moving speed of the nozzle is V, and the angle of incidence of the jet into the coolant layer is θ, then V
is preferably selected to satisfy the relationship: Vj cosθ≦V≦2Vj cosθ. The nozzle moves rotationally. In this case, the rotational angular velocity of the nozzle is ω,
If the distance from the center of rotation to the jet nozzle of the nozzle is L, then the above V becomes V=ωL.

An example of an apparatus for implementing the present invention FIG. 1 is an illustrative view of an example of an apparatus for implementing the present invention, seen from the side, and FIG. 2 is an illustrative view of an example of an apparatus for implementing the present invention, seen from above.

In the figure, a crucible 1 is attached to a rotating column 3 via a horizontal column 2. Therefore, the crucible 1 rotates around the rotating support 3. The direction of rotation is opposite to the direction in which the jet is jetted out from the pore of the nozzle 4 at the tip of the crucible 1. Also,
The crucible 1 is configured such that its inclination angle θ with respect to the horizontal plane can be changed by adjusting its mounting portion and the like. Therefore, by adjusting the inclination angle of the crucible 1, the nozzle 4 can be
The incident angle θ of the jet ejected from the pores into the cooling liquid layer 5 can be changed as appropriate. Note that the cooling liquid layer 5 is stored in a tank 6 and is in a stationary state. Preferably, the horizontal support 2 that connects the crucible 1 and the rotating support 3 is provided so that its length can be expanded and contracted.

Metal 7 is melted in crucible 1 . This melting is performed by heating with a heater 8 placed around the crucible 1. In this way, Ar gas is introduced into the crucible 1 from above the crucible 1, and its pressure causes the molten metal to flow from the pores of the nozzle 4 at an angle of θ to the horizontal plane in the opposite direction to the jet jetting direction, that is, in the figure. Rotate counterclockwise. As a result, the molten metal solidifies in the tank 6 and becomes a thin metal wire 9.

Preferably, the cooling liquid 5 is stored in a plurality of tanks 6. The plurality of tanks 6 are placed on a conveyance mechanism such as a belt conveyor. Then, as shown in FIG. 3, each tank 6 is sequentially supplied to the wire making section, and after the wire making is completed, the wire is sent to the next process. In this way, the wound bundles can be collected one after another. In the case of continuous operation in this manner, the ejection of jet from the nozzle 4 is periodically stopped, and this is done using a known stopper or the like.

DESCRIPTION OF EXAMPLES Example 1 Pb is melted using the apparatus shown in FIG. 1, and is jetted out as a jet from the through hole of the ceramic nozzle 4. At the same time, the rotary support 3 supporting the crucible 1 is aligned with the direction of jet jetting. rotated in the opposite direction. The diameter of the through hole of nozzle 4 used was 0.4 mm.
It was hot. When the incident angle θ of the jet is 28°, the jet jet velocity Vj is 5 m/sec., and the nozzle moving speed V is 7 m/sec., Pb long fibers are placed in a tank 6 in which water 5 is stored. It could be manufactured in bundles.

Next, the above operations were performed sequentially using a plurality of tanks 6. That is, each tank 6 was sequentially supplied to the wire-making section, and after the wire-making was completed, the wire was taken out from the wire-making section.

Example 2 Al was used as the molten metal, and a nozzle 4 having a through hole with a diameter of 0.2 mm was used.
When the same operation as in Example 1 was carried out with θ of 18°, Vj of 3 m/sec., and V of 3.1 m/sec., Al
We were able to produce long fibers into bundles.

Effects of the Invention As described above, according to the present invention, since metal is directly made into fine wires from its molten state, it can greatly contribute to process saving, energy saving, and downsizing of equipment. Moreover, it is suitable for distributed production or high-mix low-volume production. Furthermore, since the nozzle is rotated rearward about the rotating support, the spun wire can be wound into a bundle in the cooling liquid layer. In addition, if the cooling liquid is stored in multiple tanks, each tank is sequentially supplied to the wire making section, and the wire is sent to the next process after the wire making is completed, it will be easier to replace the wound wire bundle. .

This invention can be applied to various metal thin wires, thin wires made of amorphous materials, IC bonding wires, ultrafine wound conductors, and the like.

[Brief explanation of drawings]

FIG. 1 is an illustrative side view of an example of an apparatus for implementing the present invention. Figure 2 shows the first
FIG. 2 is an illustrative view of the device shown in the figure, viewed from above. FIG. 3 is an illustrative view showing how a plurality of tanks containing cooling liquid are sequentially supplied to the wire making section and sent to the next process after the wire making is completed. In the figure, 1 is a crucible, 2 is a horizontal support, 3 is a rotating support, 4 is a nozzle, 5 is a cooling liquid layer, 6 is a tank,
7 is a metal, 8 is a heater, and 9 is a thin metal wire.

Claims (1)

[Claims] 1. Molten metal is sent forward as a jet at an angle diagonally intersecting the horizontal plane through the pores of a nozzle supported by rotating struts extending vertically into a cooling liquid layer arranged horizontally. A method for producing a thin metal wire, comprising ejecting the jet and simultaneously rotating the nozzle backward about the rotating column. 2. Vj is the speed of the jet, V is the moving speed of the nozzle, and θ is the angle of incidence of the jet into the cooling liquid layer, and V is selected so as to satisfy the relationship: Vj cosθ≦V≦2Vj cosθ. A method for manufacturing a thin metal wire according to claim 1. 3 The angle of incidence θ of the jet into the cooling liquid layer is
The method for manufacturing a thin metal wire according to claim 1 or 2, wherein the angle is 30° or less. 4. Claims 1 to 3, wherein the cooling liquid is stored in a plurality of tanks, each tank is sequentially supplied to the wire making section, and sent to the next process after the wire making is completed. The method for producing a fine metal wire according to any one of the above.