JPS6315055B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing thin metal wires, and particularly to an apparatus for manufacturing thin metal wires having a circular cross section directly from molten metal.

Fine metal wires (fibers) are used in many ways as constituent materials for reinforced composite materials and various other functional materials, or as metal powder obtained by cutting thin wires into short pieces. In recent years, with the expansion and diversification of applications, there has been a demand for long thin metal wires having an extremely small diameter and a circular cross section.

As shown in Fig. 3, a method for directly producing fine metal wire from molten metal involves applying pressure to molten metal L in a container a, and passing the molten metal jet stream injected from a nozzle n to a rotating quenching roll r. There is a jet quenching method in which the molten metal is quenched by contact, a melt drag method in which the molten metal flowing out from the nozzle n of a container a is cooled while being supported on a rotating water-cooled metal drum d as shown in Fig. As shown in Figure 5, there is a Taylor method in which raw metal m is attached with glass g, heated and melted by a heating coil c, and the molten metal is wrapped in molten glass to form a fine wire while being pulled, and then wound onto a drum e. Proposed. As an alternative method, various attempts have been made regarding an underwater blowing method in which a jet stream of molten metal is blown into cooling water to rapidly solidify it.

However, with the above-mentioned method of cooling molten metal on a solid surface such as a roll or drum, although it is possible to obtain a thin ribbon-like wire with an irregular cross section,
The production of thin wires with a circular cross section is difficult. In order to solidify such a solid surface while maintaining a circular cross section using the surface tension of the molten metal, the molten metal must be extremely thin, which is technically problematic. The Taylor method does not have the above-mentioned drawbacks and can obtain thin wires with a circular cross section and an extremely small diameter, but on the other hand, the melting operation of the raw metal etc. is cumbersome, and the glass layer covering the surface of the thin wires must be removed. The process is cumbersome and inefficient, as it requires post-processing. On the other hand, with the underwater blowing method, it is possible to rapidly solidify at a rate higher than the critical cooling rate required to form a thin wire with a circular and ultra-fine diameter. It is easily disturbed by disturbances and external forces, and as a result, it is not possible to obtain a thin wire with a circular or extremely small diameter, and it is not possible to obtain a long thin wire because it is divided irregularly.

The present invention solves the above problems in the conventional method,
Provided is a new manufacturing device that can inexpensively and in large quantities manufacture long thin metal wires having an extremely small diameter and a circular cross section.

In the thin metal wire manufacturing apparatus of the present invention, a molten metal pressurizing chamber and a molten metal cooling chamber are fixedly connected to each other via a wall, and the wall includes a molten metal pressurizing chamber and a molten metal cooling chamber. The molten metal processing device is provided with an open molten metal injection nozzle hole, and for injecting the molten metal in the molten metal pressurizing chamber into the cooling liquid in the molten metal cooling chamber through the nozzle hole by centrifugal force. It is characterized by being equipped with a rotational drive device that rotates the pressure chamber and the molten metal cooling chamber.

According to the present invention, the molten metal in the molten metal pressurizing chamber becomes a jet stream through the nozzle holes provided in the wall due to the pressurizing action due to the centrifugal force accompanying the rotational movement, and the cooling liquid in the cooling chamber is turned into a jet stream. It is injected into the interior and rapidly solidified to become a thin metal wire.

An embodiment of the apparatus of the present invention is shown in FIGS. 1 and 2.

1 is a molten metal pressurizing chamber, into which molten metal L is introduced through an end opening 11 through a molten metal introduction gutter 2.
is supplied.

3 is a cooling chamber, which is fixedly connected to the pressurizing chamber 1 via a wall 5. In the cooling chamber 3, there is a liquid refrigerant R for rapidly cooling and solidifying the jet stream of molten metal.
is provided from the end opening 21.

A nozzle hole 4 is provided in a wall 5 that separates the pressurizing chamber 1 and the cooling chamber 3, and injects molten metal from the pressurizing chamber into the cooling chamber.

Reference numeral 6 denotes a rotary drive roller, to which a motor 7 is connected. The above pressurization chamber 1 and cooling chamber 3
are ring strips 12 and 3 provided on the respective outer peripheral surfaces.
supported on rotational drive rollers 6, 6 via 2,
By driving the rollers, the rollers are rotated at a required rotational speed about their respective axes as rotational axes.

In the above device, when the pressure chamber 1 and the cooling chamber 3 are rotated by the rotary drive roller, a ring-shaped ring is formed inside the pressure chamber 1 along its inner circumferential surface due to the action of centrifugal force, as shown in the figure. A molten metal layer L is formed. When the rotation speed is further increased to sufficiently increase the centrifugal force on the molten metal, the molten metal in the pressurizing chamber becomes a jet stream J from the nozzle hole 4 and is injected into the cooling chamber 3 due to the centrifugal pressurization. It is introduced into the coolant R. At this time, the coolant in the cooling chamber 3 also forms a layer along the circumferential surface of the cooling chamber due to the action of centrifugal force accompanying the rotation, and is rotating together with the pressurizing chamber 1, so the coolant layer R does not oscillate to some extent. Even if there is, it is almost stationary with respect to the nozzle hole 4. Therefore, the disturbances and external forces that the molten metal jet J receives when entering the cooling liquid layer R are extremely slight, and the original roundness of the jet is hardly lost and the jet is irregularly divided. It is rapidly cooled and solidified without any problems.

The molten metal jet stream ejected by the pressurized centrifugal force is stretched like a candy-like shape due to the action of the tensile force caused by the rotation of the pressurizing chamber, so that a fine metal wire thinner than the nozzle hole diameter can be obtained. Of course, the degree of stretching varies depending on the viscosity of the molten metal, the rotation speed of the pressurizing chamber, etc., so taking these conditions into account,
By appropriately setting the nozzle hole diameter, a desired ultrafine wire can be easily manufactured.

It goes without saying that it is advantageous to narrow the distance between the nozzle hole 4 and the water surface of the cooling liquid layer in order to reduce the impact when the molten metal jet enters the cooling liquid layer. After the start of injection, it is also effective to replenish the coolant from the end opening 21 of the cooling chamber to flood the nozzle hole 4, so that the jet flow from the nozzle hole directly enters the coolant layer. be.

The cooling fluid in the cooling chamber may be water, and if a sufficient amount of water is provided, rapid solidification can be achieved at a rate higher than the critical cooling rate required to solidify the molten metal jet while maintaining its circular cross section. Furthermore, it is easy to provide a required cooling rate and obtain an amorphous thin wire.

In this way, the molten metal jet flow injected by centrifugal pressure can be rapidly solidified at a cooling rate higher than the critical cooling rate without being disturbed or disrupted by external disturbances or external forces. By continuously applying the centrifugal pressure required for injection, it is possible to continuously produce a large amount of ultrafine wires having a circular cross section.

The centrifugal pressure, nozzle hole diameter, etc. required to jet the molten metal as a jet stream with a circular cross section are, of course, not uniform depending on various physical properties such as the viscosity of the molten metal, the diameter of the target thin metal wire, temperature conditions, etc. ,
The centrifugal pressurizing force is approximately 50 G or more, preferably 100 G or more in terms of gravity multiple, while the nozzle hole diameter may be appropriately determined depending on the desired wire diameter and taking into account the above conditions. In addition, in response to temperature changes in the molten metal in the pressurized chamber during the molten metal injection process, especially increases in viscosity due to temperature drop, the centrifugal pressurizing force may be adjusted appropriately by controlling the rotational speed if necessary, or the temperature may change. In order to minimize the
One method is to take measures such as covering the molten metal layer in the pressurized chamber with an adiabatic molten flux.

To give an example of manufacturing fine metal wire using the apparatus of the present invention, in the apparatus shown in FIG. 1 (inner diameter of pressurizing chamber 1: 160 mm, inner diameter of cooling chamber 3: 400 mm),
10 kg of molten stainless steel cast metal, which has been previously high-frequency melted as molten metal, is supplied into the pressurizing chamber 1, and the molten metal is injected from a nozzle 4 with a hole diameter of 2 mm with a centrifugal pressure of 120 G by rotational drive, and is rapidly solidified in a cooling water layer. By doing so, approximately 100 m of thin metal wire having a circular cross section with a wire diameter of 50 to 150 μm is obtained.

As described above, the apparatus of the present invention is suitable for manufacturing ultrafine metal wires having a circular cross section, and has a small, lightweight, and simple structure, low equipment cost, and easy operation. According to the present invention, metal fibers for various uses, such as amorphous metal fibers for magnetic tapes, electronic materials, etc., various other functional materials, or fine metal wires suitable as composite materials can be produced in large quantities and at low cost. . Moreover, the thin metal wire can be cut into metal powder and used for various purposes.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A, and FIGS. 3 to 5 are sectional views showing a conventional example. 1: Molten metal pressurizing chamber, 3: Cooling chamber, 4: Nozzle hole, 6: Rotating drive roller, 7: Motor, L: Molten metal, J: Molten metal jet stream, R: Coolant.

Claims (1)

[Claims] 1 A molten metal pressurizing chamber and a molten metal cooling chamber are fixedly connected to each other via a wall, and the wall has a molten metal injection nozzle hole that opens from the molten metal pressurizing chamber to the molten metal cooling chamber. the molten metal pressurizing chamber and the molten metal cooling chamber for injecting the molten metal in the molten metal pressurizing chamber into the cooling liquid in the molten metal cooling chamber through the nozzle holes by centrifugal force; A thin metal wire manufacturing device characterized by being equipped with a rotary drive device that rotates the metal wire.