JPS59130654A - Device for producing fine wire - Google Patents

Abstract

PURPOSE:To form a molten metal into a circular fine wire having good strippability in the production of the fine wire from the molten metal by means of a rotating water-cooled roll by forming a layer of a slightly wettable material on the surface of the roll to improve the sectional area by the surface tension of the molten metal. CONSTITUTION:A molten metal 15 in a nozzle 12 is ejected by a pressure controller 16 at a proper speed onto an internally water-cooled rotating roll 11. The surface of the roll 11 is covered by a thin water film 32 formed of a water feed pipe 21 and an air blow pipe 20. The molten metal 19 charged onto the roll 11 is made circular in section by surface tension without sticking thereon on account of the slight wettability with water. A groove 31 may be provided on the surface 11 of the roll. A fine wire 19 which is made roughly circular by the roll 11 and is cooled to solidify passes through forming rolls 24 and is taken up on a take-up roll 25. The welding of the molten metal on the roll 11 is obviated by the slight wettability of the water film, thereby obtaining the satisfactory fine wire having the circular section.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an apparatus for producing fine wire from a melt of metal, brazing material, ceramic, or the like.

[Prior art]

BACKGROUND ART Fine wires (thin wires with a circular cross section; the same shall apply hereinafter) made of metals, brazing materials, ceramics, etc. are important as constituent materials for electronic components, composite materials, metal-engraved memory materials, and the like. There is a demand for a technique for manufacturing thin wires at low cost from melts of these metals, brazing materials, ceramics, and the like.

Among these methods, methods for manufacturing thin wires using molten metal include:
Conventionally, there have been two main methods.

One is a method that goes through manufacturing processes such as melting → ingot formation → annealing → hot drawing → intermediate annealing → cold drawing, and the other is a continuous candy making method, which involves melting → continuous casting → annealing → hot drawing. This is a manufacturing method that involves steps such as drawing, intermediate annealing, and cold drawing. In either method, the process of annealing, drawing, annealing, and drawing must be repeated several dozen times to obtain a thin wire with a diameter of about one node, for example, depending on the material. Therefore, there have been many problems such as complicated manufacturing processes, high equipment costs, poor yields, and the need for precise control in continuous casting.

Another conventional method for manufacturing thin wires is the method disclosed in Japanese Patent Publication No. 1983-64948, which has recently attracted attention. This method is a method for manufacturing thin wires directly from a melt,
As shown in FIG. 1, inside a rotating cylindrical drum 1,
In this method, an annular liquid layer 2 is formed by the centrifugal force generated by 10 rotations of the drum, and a molten metal 3 is injected as a jet into this liquid layer to solidify the molten metal to produce a thin wire. The disadvantage of this method is that it is not suitable for mass production because the molten metal is injected into a cylindrical drum with limited space. That is, in order to mass-produce thin wire using this conventional method, the drum 1 had to be enlarged, and a large drive source was also required to rotate the enlarged drum, which was uneconomical. . Therefore, in reality, only preliminary quantities could be manufactured. Furthermore, this conventional method has drawbacks such as complicated equipment and difficult control, poor roundness of thin wires, and poor casting surface.

Furthermore, although it is not a thin wire manufacturing method, there has conventionally been a manufacturing method called a single roll method for manufacturing a ribbon-like material from a melt. This method involves jetting a molten material onto the surface of a roll and solidifying it, and is generally used when manufacturing amorphous metals. Although it is possible to mass-produce halibon-like materials using this method, it has not been possible to produce thin wires.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a manufacturing apparatus that can directly manufacture thin wires from a molten material and that can be mass-produced.

[Summary of the invention]

The thin wire manufacturing device of the present invention includes a nozzle that spouts a melt;
It has a roll for adhering the ejected melt to the outer peripheral surface, and a material with weak wettability to the melt is present as a uniform layer on the surface of the roll.This makes it possible to mass-produce thin wires. This makes it possible to

In the single roll method of the prior art, the ejected melt does not form into thin lines but instead forms a ribbon on the outer circumferential surface of the roll. This phenomenon occurred because the material of the roll was a material with good wettability, that is, a material with strong wettability, for the melt. Therefore, in the present invention, we focused on making the roll material a material with poor wettability, that is, a material with weak wettability.
As a result of various studies, it was discovered that a layer of a substance weakly wettable to the melt can be formed on the outer circumferential surface of the roll from which the melt is jetted. The reason why it is layered is to improve the roundness of IS and improve the casting surface of fine wires.

[Embodiments of the invention]

There are several types of weakly wettable properties, but among them, a water-wettable substance can provide advantages such as a cooling effect for the device and ease of handling. In the first embodiment described below, water is used as the weakly wettable substance. In this case, various methods for creating a water layer with a uniform thickness were investigated. This is because if the thickness of the water layer is not uniform, the casting surface of the thin wire will be poor and it will not be possible to obtain a wire with good roundness. As a result, a means was provided to allow the water to flow onto the roll surface and blow off the excess water using gas pressure. The feature of this embodiment is that a water layer with a uniform thickness is formed, and unless a water layer with a uniform thickness is formed, a thin line with good surface precision cannot be obtained.

FIG. 2 shows a thin wire manufacturing apparatus according to a first embodiment of the present invention. A nozzle 12 is provided on the upper outer surface of a roll 11 that is rotatably provided clockwise. A heater 13 exists around this nozzle 12, and the nozzle 12 is chucked by a boulder 14. The interior of the nozzle 12 is filled with a metal melt 15, and a pressure controller 16 for controlling the pressure of the melt 15 is provided at the base of the nozzle. A water tank 18 is provided below the roll 11 to receive water 17 falling from the roll 11. On the left side of the roll 11, there is a pressure supply pipe 20 that sprays gas for peeling the thin wire 19 from the roll 11, and a water supply pipe 21.
and is provided.

These pressure supply pipe 20 and water supply pipe 21 both have solenoid valves 22 and 23.
is installed. Further to the left of the roll 11,
A forming roll 24 is provided to further improve the roundness of the peeled thin wire.
A winding roll 25 for winding up the formed fine wire is provided further to the left of the wire.

The function of the bookcase-embodiment will be described below.

The raw material in the heat-resistant nozzle 12 chucked in the holder 14 is melted by the heater 13 .

The melt 15 is passed through a nozzle 1 having a round spout.
2, the gas is ejected onto the surface of the roll 11 rotating at a low speed by the gas pressure of the pressure controller 16.

In this case, water flows out from the water supply pipe 21 to the roll surface via the solenoid valve 23, and excess water adhering to the roll light surface is drained from the water supply pipe 21 via the solenoid valve 22, which is a feature of the present invention. The gas pressure creates a uniformly polished layer of water. While adhering to the 15 roll roll 11, the ejected melt is cooled and solidified while maintaining surface tension and forming a circular cross section.

Thereafter, it is forcibly peeled off from the roll 11 by the gas pressure of the pressure supply pipe 20 and becomes a fine wire. This pressure supply pipe 20 has two effects: blowing off excess moisture and peeling off fine wires. What is important here is to cool and solidify the ejected molten material 15 while maintaining its surface tension. In order to maintain this surface tension, the number of rotations of the Fi roll becomes a major problem. That is, when the rotation speed of the roll 11 is high, the melt 1
Since water is present between the roller 5 and the roll 11, the wettability is weak and the melt 15 is blown away. Therefore, it is important to set the rotational speed of the rolls at a low speed so that the melt 15 is not blown away, and it depends on the surface tension of the melt 150. The peeled thin wire 19 has a good casting surface and a good roundness, but in this embodiment, it is further shaped by a forming roll 24. Also, if necessary, use the forming roll 2.
After step 4, rolling rows/L- (not shown) may be installed in several stages to carry out the rolling process, and finally the roll 25 is wound up.

In this example, the roll 11 is a drum with a flat surface, but in other examples, as shown in FIG. It may also have the following. When the molten material 15 has a circular cross section of a thin wire, such as when the melt 15 is made mainly of iron, the cross section of the groove 31 may be semicircular as shown in FIG. can. Groove 3 like this
A water layer 32 is also formed between the roll 11 and the thin wire 19. Further, if the melt 15 is difficult to form a thin circular cross section, it is desirable that the groove 31 has a deep substantially U-shaped cross section as shown in FIG. It is desirable that the radius of the bottom of this approximately U-shaped groove and the radius of the semicircular groove be approximately the same as the radius of the thin wire to be manufactured. If the difference is larger than the diameter of the thin wire, the roundness will deteriorate.

In the first embodiment, water is supplied through a single water supply pipe 21, but water may be supplied through a shower 33 as in a second embodiment described below. That is, in FIG. 6, a large amount of water 37 is flowed into the chamber 34 from the water supply pipe 36 via the solenoid valve 35, and the thin wire 19 is connected to the shower 3.
In step 3, he is forced to cry.

According to the second embodiment, the surface of the roll 11 is exposed to the shower 33.
Since the roll 11 is cooled by water, there is no need to provide a water-cooled structure inside the roll 11, which has the effect of simplifying the equipment. In addition, when the water 37 overflows, it is drained from the drain pipe 38.

In the second embodiment, water is sprayed from the chamber 34 as a shower 33, but an inert gas 41 may be sprayed from the chamber 34 onto the thin wire 19 as in the second embodiment described below. That is, in FIG.
4 is installed on the outer periphery of the roll 11, an inert gas 41 is caused to flow from the pressure supply pipe 40 through the solenoid valve 35, and the molten material 1 is sprayed onto the surface of the fine wire from a large number of gas holes 42 provided in the chamber 34.
This prevents the oxidation of No. 5. This example has the effect of obtaining a thin wire with extremely little oxidation.

In the first to third embodiments described above, water was used as the weakly wetting material, but as shown in Figure 8, the thin wire produced using water as the weakly wetting material is shown in Fig. 8. Shows the cross-sectional shape. This cross-sectional shape was taken from a photograph of the cross-sectional shape of a thin wire. The manufacturing conditions were Fe-4%Si in the bath melt.
The roll is an alloy tool '4 with a diameter of 200 rrm.
4 and had grooves on the surface to assist in forming a circular cross section of the thin wire. The rotational speed of the roll was 125 cm, the ejection pressure of the melt was 0.5 kg/cm'', and the diameter of the nozzle was approximately 0.6 m.The amount of water from the water supply pipe was 0.5 t/min. Gas pressure tri from pressure pipe
2 Kg/cm'. It can be seen from FIG. 8 that the circularity of the thin wire is very good. Although the cross-sectional shape obtained by the known technique is not shown, it is incomparably worse than the thin wire obtained by the method of the present invention. Figure 9 shows the manufacturing conditions in Figure 8.
This is the cross-sectional shape when no water layer was intentionally used, and it is clear that even if the other manufacturing conditions are exactly the same, the absence of a water layer improves the wettability and does not result in fine lines, so the effect of the presence or absence of a water layer is This is one notable example.

Furthermore, in the case where water is used as the weakly wetting substance as in the first to third embodiments described above, the molten material does not necessarily have to be a metal, and for example, the molten material may be a brazing material or a ceramic. You can also do that.

In this case, a brazing material with good wettability, such as Au-
20wt%Sn) can also be produced. That is, since the brazing material has good wettability, it could not be peeled off even if an attempt was made to forcibly peel it off using a peeling gas, making continuous production impossible. However, by interposing the water layer of the present invention on the roll surface, the wettability became weaker, and continuous production became possible by easily peeling off with a peeling gas.

Furthermore, when water is used as the weak wetting substance, there is no need to provide cooling equipment for the roll 11, and the material of the roll 11 may be either metal or non-ferrous. That is, the materials used in the conventional single roll method have a water-cooled structure inside the roll to prevent a rise in temperature of the roll from the viewpoint of mass production. In this case, the roll material used is iron alloy, which has poor thermal conductivity and cannot be water-cooled, so it is limited to copper alloy, which has good thermal conductivity.Moreover, since the roll is worn during ribbon production, it is hard and resistant. Must be made of a material with good abrasion resistance.

However, in the above embodiment, there is no need to consider the conventional selection factors of roll material (thermal conductivity, abrasion resistance).

This is because by interposing a layer of water between the molten material and the roll, the molten material can be directly cooled by a film of water, resulting in a small temperature rise in the roll. This is because the material does not come into direct contact with the roll, so the amount of damage to the roll is pitifully small. Therefore, the roll material used in the above embodiments may be of any material as long as it has the strength to withstand low speed rotation.

For example, mild steel 9 alloy steel, stainless steel, copper alloy.

Aluminum alloy, magnesium alloy, titanium alloy, zirconium alloy, nickel alloy, ceramic for σ, etc.
Non-metallic materials such as carbon resin can also be used as the roll material.

In the first to third embodiments described above, water f- was used as a layer of other substances that are weakly wettable to the melt, but
The melts in this case include aluminum alloys, nickel alloys, copper alloys, and magnesium alloys.

This includes titanium alloys, high-speed steels, shape memory alloys, amorphous alloys, brazing materials, stainless steels, and special alloy steels.

However, the material of the film may be either liquid or solid as long as it has weak wettability between the molten material and the roll material, and can be made to have a uniform thickness. Nonflammable oils, resins, finely powdered ceramics, graphite, etc., which are weakly wettable substances, may be present in a layered form on the roll surface. As a method of using resin, it is possible to coat the roll surface with resin to form a layer.

〔Effect of the invention〕

According to the thin wire manufacturing apparatus of the present invention, thin wires can be directly manufactured from a melt, and the thin wires can be mass-produced.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional perspective view of a conventional m-line manufacturing device. FIG. 2 is a schematic diagram showing a thin wire manufacturing device according to the first embodiment of the present invention. FIG. 3 is a front view of the roller shown in FIG. Figure 3 ■ is a side view of the prisoner in Figure 3, Figure 4 is an enlarged view of the groove in Figure 3 (to), Figure 5 is an enlarged view of the groove in another embodiment, and Figure 6 is a thin line in the second embodiment. FIG. 8 is a schematic diagram showing a thin wire manufacturing device according to an embodiment of the present invention. FIG. 9 is a schematic diagram showing a thin wire manufacturing device according to an embodiment of the present invention. FIG. 3 is a cross-sectional diagram of a thin wire manufactured without providing a layer of C tooth substance. 1... Drum, 2... Liquid layer, 3... Molten metal,
DESCRIPTION OF SYMBOLS 11... Roll, 12... Nozzle, 13... Heater, 14... Holder, 15... Melt, 16...
Pressure controller, 17...Water, 18...4 layers of water, 19.
... Thin wire, 20 ... Pressure supply pipe, 21 ... Water supply pipe, 22
．． 23... Solenoid valve, 24... Forming roll, 25...
・Take-up roll, 31...groove, 32...water layer, 33.
... Shower, 34 ... Chamber, 35 ... Solenoid valve, 36 ... Water supply pipe, 37 ... Water, 38 ... Drain pipe, 40 ... Pressure supply pipe, 41 ... Inert Gas, 42...
・Gas hole. Agent Patent Attorney Akio Seibashi ρ Condolences 7 Figure 319 - Figure 3 House Plan

Claims (1)

[Scope of Claims] 1. It has a nozzle for spouting a molten material, and a roll for adhering the spouted molten material to an outer circumferential surface, and the surface of this roll is coated with a substance that is weakly wettable to the molten material. A thin wire manufacturing device characterized in that the wires are present in a uniform layer. 2. The thin wire manufacturing apparatus according to claim 1, wherein the weakly wettable substance is a liquid. 3. The thin wire manufacturing apparatus according to claim 2, wherein the substance weakly wettable with liquid is water, and the roll is provided with a water supply pipe that supplies water to the roll and a supply pressure ρ that blows away excess water. 4. The thin wire manufacturing apparatus according to claim 1, wherein the weakly wettable substance is solid. 5. The thin wire manufacturing apparatus according to claim 4, wherein the solid weakly wettable substance is a resin coated on the roll surface. 6. The thin wire manufacturing apparatus according to claim 1, wherein the roll has a groove on its outer peripheral surface having a shape corresponding to the cross section of the thin wire to be manufactured.