JPS63194849A - Continuous production of metal fine wire - Google Patents

Abstract

PURPOSE:To stably take out a metal fine wire from a discharging hole by injecting molten metal to cooling water layer formed on an inner circumferential face of rotating drum through a nozzle and solidifying, and specifying the ratio of the drum circumferential velocity to the molten metal jet flow velocity at the time of taking out as the metal fine wire. CONSTITUTION:While rotating the cylindrical drum 1, the cooling water is supplied in the drum 1 and the cooling water layer 2 is formed along the inner circumferential face of the drum by centrifugal force. To this cooling water layer 2, the molten metal is injected from the inside through the nozzle 3, and solidified and guided toward the discharging hole 14 by the centrifugal force and the metal solidified wire W is continuously taken out of the drum 1 from the discharging hole 14 together with the cooling water. In this case, molten metal is injected, so as to satisfy the conditional inequality among the drum circumferential velocity VD, the molten metal jet flow velocity VJ, angle thetaof the molten metal jet injected on the cooling water surface to the tangential line at contacting point and angle PSI from point A, which the molten metal jet is brought into contact with the cooling water surface to point B of the discharging hole 14.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for continuously manufacturing thin metal wires, particularly amorphous wires.

(To the prior art and its problems) Amorphous wire rods are being put into practical use as reinforcing materials and various sensors, and future demand is expected, and a practical technology to continuously manufacture ultrafine wires directly from molten metal is desired. It is rare.

As a method of obtaining a thin wire with a circular cross section directly from molten metal, the molten metal ejected from a nozzle is guided into a rotating body that forms a cooling liquid layer, cooled and solidified, and then continuously wound around the inner wall of the rotating body. There are methods (such as Japanese Patent Application Laid-open No. 165016/1983). However, this method always requires batch operation, making continuous production operation on an industrial scale extremely difficult.
).

This drawback is attributed to the method itself, in which a cooled liquid layer is pushed inside a rotating cylinder by centrifugal force, and then the cooled and solidified metal filament is continuously accumulated and wound around the inner wall of the rotating cylinder. A method has also been devised in which the cooling material is cooled by a belt-shaped cooling body using a jet nozzle or a grooved belt conveyor (Japanese Patent Application Laid-open Nos. 58-119440 and 1987-173059). In this method, it is very difficult to stabilize the cooling liquid layer.
Another drawback is that the water layer movement speed cannot be increased.

When obtaining a thin metal wire directly from molten metal, one of the important factors in terms of manufacturing conditions is to set the speed and change of the molten jet flow velocity Vj and drum circumferential velocity VD to appropriate values. V
When D/V; deviates from the optimum range and becomes smaller, a vertical line or irregularly shaped discontinuous line will be formed, or even if it becomes a continuous line, it will become distorted. On the other hand, if VD/Vj exceeds the optimum range and increases, it is difficult to obtain continuous thin wires, and only short fibrous wires can be obtained. For example, in the method described in JP-A-56-165016, in which the wire is continuously wound into a rotating body without being taken out, the formed thin wire is restrained on the inner surface of the drum, so it eventually solidifies. , the speed of the wire after cooling completely matches the peripheral speed of the drum. Although the fluctuation difference between the jet flow velocity and the drum peripheral speed can be absorbed by reducing the cross-sectional area of the solidifying molten metal jet flow, etc., it is considered that the conditions of VD/Vj to obtain a continuous long thin line are extremely narrow.

Regarding this VD/Vj, the above-mentioned publication (Unexamined Japanese Patent Publication No. 56-16
5016, JP 58-119440, JP 58173059) is 1°05 <VO/
V3<I, presenting a narrow range of 30 mm.

On the other hand, there is a method and apparatus for continuously manufacturing thin metal wires of different types as shown in Japanese Patent Application Laid-open No. 6/253148. In this method, cooling water is supplied into the drum while rotating a cylindrical drum, and 1 m of cooling water is formed along the inner peripheral surface of the drum by centrifugal force, and the molten metal is poured into the cooling water layer through a nozzle. The metal coagulation wire is injected toward the drum, solidified, and guided by centrifugal force toward the outlet (water outlet), where the metal coagulation wire is continuously discharged into the cooling water and tub, and the fine metal wire is taken out of the drum. That is, the thin wires are discharged from the outlet along with the cooling water without being deposited on the inner surface of the drum.

(Problem to be solved by the invention) In this method, after a certain run-up distance, the formed thin wire is released together with the cooling liquid without being restrained by the inner surface of the drum, so assimilation and cooling are not necessarily completed. The thin wire and drum peripheral speed do not match, that is, the motion behavior of the thin wire when cooling water enters is completely different from the first method.

(2) Since the optimum manufacturing conditions for D/Vj change and are limited by manufacturing factors specific to the device, it is necessary to newly grasp the relationship in this method.

An object of the present invention is to provide a method for producing thin metal wires that uses a rotating body and that allows the thin wires formed on the inner wall to be discharged together with a cooling liquid without depositing the thin wires, with the conditions that a continuous wire can be taken out stably. It is to be.

(Means for Solving the Problems) The method for continuously producing thin metal wires according to the present invention involves supplying cooling water into the drum while rotating a cylindrical drum, and cooling water along the inner peripheral surface of the drum by centrifugal force. A water layer is formed, and the molten metal is injected from inside the cooling water layer through a nozzle toward the cooling water layer to avoid solidification, and guided by centrifugal force toward the outlet, and from the outlet along with the cooling water. In a continuous manufacturing method for thin metal wire, in which the metal solidified wire is continuously discharged and the thin metal wire is taken out of the drum, the drum circumferential speed VD, the molten metal jet flow speed V
j, satisfies the relational expression between the angle θ between the molten metal jet entering the cooling water surface and the vertical line, and the angle ψ from the point where the molten metal jet lands on the cooling water surface to the position of the outlet It is characterized in that it is manufactured in this manner.

(Function) Under the above conditions, thin metal wires can be produced stably and continuously.

(Example) Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

(a) Manufacturing conditions Continuous manufacturing method of thin metal wire according to the present invention (JP-A-61-2
53147), as shown in Fig. 1, a cooling water layer 2 is formed along the inner peripheral surface of the drum by centrifugal force by supplying cooling water into the cylindrical drum 1 while rotating the drum. , the molten metal M is injected from inside the cooling water layer 2 through the nozzle 3 toward the lower cooling water layer 2, solidified, guided toward the outlet 14 by centrifugal force, and The metal coagulation wire W is continuously taken out of the drum l together with the cooling water. Mechanically, continuous extraction is difficult if extraction from the rotating drum is performed from the inside, but nozzle 3 injects molten metal onto the rotating drum that forms a cooling water layer.
By providing the take-out opening 14 opposite to the opening 14, the fine metal wire W solidified by the cooling water can be taken out quite naturally without resisting the external force applied thereto.

In this method, when the molten metal ejected from the nozzle enters the liquid layer 2 at point A, the molten metal jet flow velocity Vj and the liquid J
Due to the difference of ~'DCO3θ in the ejection direction component of the velocity of i7i2, dynamic pressure is applied to the molten metal flow, and the flow t is disturbed.

If this turbulence is small, there is no problem; the particles solidify in the liquid layer 2 and are discharged from the outlet 14 at a run-up distance from the inner surface of the tram. However, when the dynamic pressure is large, the disturbance becomes large, and the solidified line W is affected by the disturbance,
Instead of a straight line, it becomes a twisted line. If the degree of twist is large, resistance will be applied to the wires through the outlet 14, making it impossible to discharge the drum, and the wires will accumulate on the inner surface of the drum, making operation impossible.

In the present invention, as shown in an example later, the flow velocity V determines the degree of dynamic pressure, and the seven liquid layer velocity components V cos θ
It has been found that when the difference in Vj exceeds a certain ratio, release becomes impossible.

In other words, when the approach angle is θ, it is sufficient that the following is satisfied.In addition, in this method, the molten metal jet ejected from the nozzle 3 enters the liquid layer 2 at point A, solidifies and cools. The thin wire W thus formed reaches the inner wall of the drum. Here, after a certain run-up distance along the inner wall of the drum, the thin wire W is discharged from the outlet I4 without being restrained.

Therefore, the speed of the solidified and cooled thin wire W and the peripheral speed of the drum do not completely match. The force applied to the thin wire is the sliding friction between the thin wire and the drum caused by the speed difference, and its magnitude is proportional to the run-up section. In the present invention, as will be shown later, this is due to the angle ψ between the nozzle ejection position A and the outlet position B. If this condition is not met, the force generated by sliding friction will increase, and the thin wire will break due to this force, making it impossible to obtain a continuous line.

From the above, it has been found that continuous thin wire can be stably extracted using the method disclosed in Japanese Patent Application Laid-Open No. 61-253148. That is, the conditions for stably extracting a continuous line were found and expressed mathematically by finding the lower and upper limits of VD/Vj as functions specific to the device.

(iii) Continuous manufacturing device for thin metal wires FIG. 2 is a plan view of the continuous manufacturing device for thin metal wires used in this example, FIG. 3 is an elevation view thereof, and FIG. 4 is a side view thereof.
FIG. 5 is a side sectional view thereof.

In FIG. 3, the cylindrical drum 1 has fixed bearings 21 on three sides of its circumference. The drive heald 22, which is supported by... and wound around its circumferential surface, is driven by a drive pulley 25 and rotated around a horizontal central axis.

This drive belt 22 is connected to the V-belt 2 by an electric motor 23.
4. The drive belt 22 is supported by the take-out robot pulleys 26 and 26, and is stretched outwardly by a tension pulley 27. Therefore, an opening 14, which is an opening, is formed between the take-out Roburis 26 and 26, and a space for taking out the thin wire W is ensured at the take-out port I4 of the rotating drum 1. As explained later,
The cooling water and the thin metal wire W are taken out from the outlet 14.

As shown in FIGS. 4 and 5, the rotating drum 1 has a water supply side drum part 11 and a heating side drum part 12 arranged opposite each other so that a slit 3 is formed therebetween, and the slit I3 is closed. As mentioned above, the drive belt 22 is not present between the two water discharge robots 26 and 26,
An outlet 14 is formed. Of course, the drive of the rotary drum 1 and the belt 22 for sealing the slit-shaped circumferential opening may be separate devices, and a drive means such as a central shaft may be provided separately.

The tip of the water supply pipe 4 is inserted into the rotary drum 1 through the water supply tram opening 16, and is taken out from a water receiving hole (not shown) disposed below the outlet I4 by a pump 43 via a filter 12. The cooling water discharged from the rotary drum 1 is circulated and supplied again into the rotating drum 1 to form a cooling water layer 2 of a constant thickness.

Further, as shown in FIG. 5, a molten metal injection nozzle 3 is disposed within the rotating drum 1 so as to be directed from the support shaft I5 to the cooling water layer 2 at a constant angle. A high frequency coil 32 is arranged around the nozzle 3,
The sprayed metal melt of 7nM is heated and melted. In this nozzle, molten metal M is injected by compressed gas supplied from an Ar cylinder 31 (not shown in FIG. 2).

The solidified thin metal wire W taken out from the outlet 14 is preferably dropped onto the net-like belt conveyor 5 shown in FIG. 1, formed into a spiral shape, and wound into a coil shape at the end of the conveyor. Note that 6 is a blower.

When operating this device, while rotating drum I,
Cooling water is supplied into the drum from the supply pipe 4 to form a cooling water layer 2 along the inner peripheral surface of the drum. Next, nozzle 3
When the molten metal M is injected from the drum, the molten metal M enters the cooling water layer, cools and solidifies, and at the same time is pulled away in the rotational direction of the cooling water and lands on the inner peripheral surface of the drum due to centrifugal force. The generated solidified fine wires proceed toward the outlet 14 on the sleeve)-shaped circumferential opening 13 with the cooling water, and are released by the centrifugal force of the cooling water due to the fluid pressure and themselves. Due to the acting centrifugal force, the water is discharged to the outside of the drum through the opening (takeout port) 14 between the water outlet pulleys.

(c) Example An amorphous metal thin wire was manufactured under the following conditions.

Fine wire material Amorphous Fe-5i-B wire diameter
φ120μR (±lOμR) Drum rotation speed
305 rpm drum peripheral speed
7.98m/s Guide material Transparent vinyl chloride Guide length 15
0mm take-out loss slit width 1mm take-out port length 30mm Nose angle between temporary guide and tangential direction 0° Ejection pressure
3. f) -4,0kgf/'mm' drum inner diameter
Various VD/V3.
The manufacturing results under the conditions of θ and ψ are shown.

Here, VD is the drum peripheral speed (m/s), ■ is the molten metal jet flow velocity (m/s) calculated from the nozzle diameter, molten metal ejection weight, molten metal density, and ejection time, and θ is the molten metal jet flow is the angular change (approach angle) between the tangent at the surface landing point and the vertical direction when the molten metal jet enters the cooling liquid surface, and ψ is the angle from the point where the molten metal jet lands on the cooling liquid surface, from the rotational direction of the drum. This is the measured angle to the position of the outlet (90°≦ψ≦300°).

In No., I-No. 6, the approach angle was fixed at 060° and the outlet angle was fixed at ψ240°, and the ejection pressure was changed to obtain VD/
Change Vj.

For No., 1-No., and 3 within the range of conditional expression (1), straight continuous lines were successfully extracted. In other cases, twisted wires may become clogged at the outlet 14 or breakage may occur.

For No. 7 to No. 10, set the approach angle to 030° and change -V O/V 3. The manufacturing conditions expand according to conditional expression (1), but if the range is out of range (N
o, 9, No, 10), it doesn't work.

No, lI to No, l3, the outlet position ψ is changed. The upper limit of conditional expression (1) changes depending on ψ, or if this condition is exceeded, a disconnection occurs midway.

For No. 14, the entry angle is 065° and the exit position is ψ2.
When the angle was set to 40°, the manufacturing conditions became extremely U゛, and the process stalled midway.

(Effects of the invention) By finding the optimum manufacturing conditions, it has become possible to manufacture stable continuous wires1. Furthermore, the present invention is not only suitable for manufacturing amorphous wires, but also for producing ultrafine wires of other metals from molten metal. Since it can also be applied to direct manufacturing technology, its practicality is extremely high.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view schematically showing a continuous manufacturing method for thin metal wires. FIG. 2 is a plan view of a continuous manufacturing apparatus for thin metal wires according to the present invention, FIG. 3 is an elevation view thereof, and FIG. 4 is a side view thereof.
FIG. 5 is a sectional view taken along the line V--V in FIG. 3. ■...Rotating drum, 2...Cooling water, 3...
- Molten metal spout nozzle, 4... Water supply pipe, 5 - Belt conveyor, 14... Outlet.

Claims (1)

[Claims] (1) Cooling water is supplied into the drum while rotating the cylindrical drum, a cooling water layer is formed along the inner peripheral surface of the drum by centrifugal force, and molten metal is poured from inside the cooling water layer through a nozzle. The thin metal wire is injected toward the cooling water layer to solidify, is guided by centrifugal force toward the outlet, and the metal coagulated wire is continuously discharged from the outlet along with the cooling water, and the thin metal wire is taken out of the drum. In the continuous manufacturing method of
, and the angle ψ from the point where the molten metal jet lands on the cooling water surface to the position of the outlet: 0.5/cos θ≦V_D/V_j≦1.38-0.2
1. A continuous manufacturing method for a thin metal wire, characterized in that the manufacturing method satisfies 5ψ/300.