JPH0642981B2 - Continuous production method for fine metal wires - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for continuously producing thin metal wires, particularly amorphous wire.

(Prior art and its problems) Amorphous wire is being put to practical use as a reinforcing material and various sensors, and future demand is expected, and a practical technology for continuously manufacturing ultrafine wires directly from molten metal is desired. There is.

As a method to obtain thin wires with a circular cross section directly from the molten metal, the molten metal ejected from the nozzle is introduced into the rotating body forming the cooling liquid layer, cooled and solidified, and then continuously wound on the inner wall of the rotating body. There is a method (Japanese Patent Laid-Open No. 56-165016, etc.). However, according to this method, batch operation is always performed, and continuous production operation on an industrial scale is extremely difficult.

This defect is due to the method itself in which the cooling liquid layer is maintained in the rotating cylinder by centrifugal force, and the metal filaments that have been cooled and solidified are continuously accumulated and wound on the inner wall of the rotating cylinder. Instead, a method of cooling with a belt-shaped cooling body by a jet nozzle or a belt conveyor with a groove has also been devised (JP-A-58-119440 and JP-A-58-173059). In this way it is very difficult to stabilize the cooling liquid layer,
Further, there is a drawback that the moving speed of the water layer cannot be increased.

As one of the important factors in the manufacturing conditions when directly obtaining the thin metal wire from the molten metal, the molten jet flow velocity V _j and the drum peripheral speed are
There is a point to make the speed ratio of V _D an appropriate value. If V _D / V _j deviates from the optimum range and becomes small, granular or irregularly discontinuous lines will be formed, or even continuous lines will be distorted, and vice versa. If V _D / V _j exceeds the optimum range and becomes large, it is difficult to obtain a continuous thin wire, and only a short fibrous one is obtained. For example, in the method described in JP-A-56-165016, in which the wire is continuously wound into the rotating body without being taken out, the fine wire thus formed is bound to the inner surface of the drum and finally solidified. ， The speed of the cooled wire and the drum peripheral speed are exactly the same. The fluctuation difference between the jet velocity and the drum peripheral velocity can be absorbed by the decrease in the cross-sectional area of the molten metal jet flow that is solidifying, etc., but the condition of V _D / V _j for obtaining a continuous long thin wire is considered to be very narrow. To be Regarding this V _D / V _j , the above-mentioned publications (JP-A-56-165016, JP-A-58-119440, JP-A-58-17305) are used.
9) presents a narrow range of 1.05 <V _D / V _j <1.30.

On the other hand, as a completely different method and apparatus for continuously producing fine metal wires, there is one disclosed in Japanese Patent Laid-Open No. 253148/1986. In this method, while cooling the cylindrical drum, cooling water is supplied into the drum to form a cooling water layer along the inner peripheral surface of the drum by centrifugal force, and the molten metal is directed to the cooling water layer through a nozzle. It is sprayed and solidified, guided by a centrifugal force toward the outlet (water discharge port), and the metal solidification wire is continuously discharged from the outlet together with the cooling water, and the thin metal wire is taken out of the drum. That is, the fine wire is not deposited on the inner surface of the drum, and is discharged together with the cooling water from the outlet.

(Problems to be Solved by the Invention) In this method, since the formed fine wire is released with the cooling liquid without being restricted by the inner surface of the drum after a certain running distance, the solidification / cooling is not necessarily completed. The fine line and the drum speed do not match. That is, the movement behavior of the fine wire after the cooling water has entered is completely different from that of the first method.

Since the optimum manufacturing condition of V _D / V _j is changed and limited by the manufacturing factor peculiar to the apparatus, it is necessary to newly grasp the relationship in this method.

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

(Means for Solving the Problems) In the method for continuously producing thin metal wires according to the present invention, a cooling water layer is supplied along the inner surface of the drum by centrifugal force by supplying cooling water into the drum while rotating the cylindrical drum. The molten metal is sprayed from the inside of the cooling water layer toward the cooling water layer through the nozzle to solidify it, and is guided toward the outlet by centrifugal force. In the continuous manufacturing method of the thin metal wire for discharging the thin metal wire to the outside of the drum, the drum peripheral speed V _D , the molten metal jet flow velocity V _j , and the angle formed by the molten metal jet entering the cooling water surface with the vertical line. The relational expression between θ and the angle ψ from the point where the melt jet lands on the surface of the cooling water to the position of the outlet It is characterized in that it is manufactured so as to satisfy.

(Operation) Under the above conditions, the thin metal wire can be stably and continuously manufactured.

(Examples) Examples of the present invention will be described below with reference to the accompanying drawings.

(a) Manufacturing conditions A method for continuously manufacturing thin metal wires according to the present invention (JP-A-61-2).
In Japanese Patent No. 53147), as shown in FIG. 1, while cooling the cylindrical drum 1, cooling water is supplied into the drum to form a cooling water layer 2 along the inner peripheral surface of the drum by centrifugal force. , The molten metal M is sprayed from the inside of the cooling water layer 2 toward the lower cooling water layer 2 through the nozzle 3 to solidify the molten metal M, and is guided toward the outlet 14 by centrifugal force. The metal solidification line W is continuously taken out of the drum 1 together with the cooling water. It is difficult to continuously take out from the rotary drum mechanically if it is taken out from the inside, whereas the nozzle 3 for injecting the molten metal to the rotary drum forming the cooling water layer is used.
If the extraction opening 14 is provided so as to face with, the metal thin wire W solidified by the cooling water can be taken out very naturally without countering the external force applied to it.

In this method, when the molten metal ejected from the nozzle enters the liquid layer 2 at the point A, the molten metal jet velocity V _j and the liquid layer 2
The difference in V _D cos θ of the jet direction component of the velocity causes a dynamic pressure on the molten metal flow, which disturbs the flow. If this turbulence is small, there is no problem, and the line W solidified in the liquid layer 2 is discharged from the outlet 14 with a run-up distance L from the inner surface of the drum. However, when the dynamic pressure is large, the turbulence becomes large, and the solidified line W is also affected by the turbulence and becomes a twisted line instead of a straight line. If the degree of this deviation is great, resistance is applied to the wire W at the take-out port 14, discharge is impossible, and a wire formed on the inner surface of the drum accumulates, making operation impossible.

In the present invention, the difference between the jet flow velocity V _j and the liquid layer velocity component V _D cos θ that determines the degree of dynamic pressure is V
It has been found that the emission becomes impossible when the ratio exceeds _j . That is, when the approach angle is θ, It turns out that it is sufficient to satisfy.

Further, in this method, the molten metal jet ejected from the nozzle 3 enters the liquid layer 2 at the point A, and the solidified and cooled thin wire W reaches the inner wall of the drum. Here, after a certain running distance L is set along the inner wall of the drum, the thin wire W is discharged from the outlet 14 before being restrained.

Therefore, the speed of the solidified and cooled thin wire W and the drum peripheral speed do not completely match. The force applied to the thin wire is a sliding friction between the thin wire and the drum, which is caused by the speed difference, and the magnitude thereof is proportional to the running section L. In the present invention,
As described later, it has been found that the condition is determined by the angle ψ between the nozzle ejection position A and the ejection port position B. That is, Is. If this condition is not satisfied, the force generated by the sliding friction becomes large, and the fine line is cut off by the force, and a continuous line cannot be obtained.

From the above, using the method of JP-A-61-253148, the conditions under which continuous thin wires can be stably discharged from the outlet are I found out. That is, the condition for stably extracting a continuous line was found by formulating the lower limit and the upper limit of V _D / V _j as a function peculiar to the apparatus and formulating it.

(b) Continuous production apparatus for fine metal wires FIG. 2 is a plan view of the continuous production apparatus for fine metal wires used in this embodiment, 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 is supported by fixed bearings 21 on its three circumferential surfaces, and a driving belt 22 wound around the circumferential surface is driven by a driving pulley 25.
Is driven to rotate about a horizontal central axis. The drive belt 22 is operated by an electric motor 23 via a V belt 24. The drive belt 22 is supported by the take-out pulleys 26, 26, and
The tension pulley 27 is stretched so as to spread outward. Therefore, the take-out port 14 which is an opening is formed between the take-out port pulleys 26, 26, and a space for taking out the thin wire W is secured in front of the take-out port 14 of the rotary drum 1. As will be described later, the thin metal wire W flows from the outlet 14 together with the cooling water.
Is taken out.

As shown in FIG. 4 and FIG. 5, the rotary drum 1 has a water supply side drum portion 11 and a heating side drum portion 12 which are opposed to each other so that a slit 13 is formed therebetween, and the slit 13 is closed. The drive belt 22 is wound, and as described above, the drive belt 22 does not exist between the water outlet pulleys 26, 26,
The outlet 14 is formed. Of course, the driving of the rotary drum 1 and the blocking belt 22 having the slit-shaped circumferential opening may be separate, or a driving means such as a central shaft may be separately provided.

The tip of the water supply pipe 4 is inserted into the rotary drum 1 through the water supply drum opening 16 and water is discharged from the water outlet from a water receiving tank (not shown) disposed below the water outlet 14 by a pump 43 through a filter 42. The cooling water is circulated and supplied again into the rotary drum 1 to form the cooling water layer 2 having a constant thickness.

Further, as shown in FIG. 5, a molten metal injection nozzle 3 is arranged in the rotary drum 1 from the support shaft 15 so as to be directed to the cooling water layer 2 at a constant angle. A high-frequency coil 32 is provided around the nozzle 3 so as to surround it.
The molten metal M to be sprayed is heated and melted.
In the nozzle, the molten metal M is injected by the compressed gas supplied from the Ar cylinder 31 shown in FIG.

The solidified thin metal wire W taken out from the take-out port 14 is preferably dropped onto the net-shaped belt conveyor 5 shown in FIG. 1 to make a spiral shape and wound into a coil at the conveyor end. In addition, 6 is a blower.

When operating this device, while rotating the drum 1,
Cooling water is supplied from the supply pipe 4 into the drum to form the cooling water layer 2 along the inner peripheral surface of the drum. Then, nozzle 3
When the molten metal M is injected from the molten metal M, the molten metal M enters the cooling water layer, is cooled and solidified, and is simultaneously bent in the rotation direction of the cooling water, and is landed on the inner peripheral surface of the drum by the centrifugal force. The generated solidified fine wire W travels on the slit-shaped circumferential opening 13 together with the cooling water toward the outlet 14, and is released by the fluid pressure when being released by the centrifugal force of the cooling water and the centrifugal force acting on itself. It is discharged to the outside of the drum from the opening (take-out 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-Si-B Wire diameter φ120μm (± 10μm) Drum rotation speed 305rpm Drum peripheral speed 7.98m / s Guide material Transparent PVC guide part length 150mm Entry slit width 1mm Entry length 30mm With guide plate Angle formed by tangential direction 0 ° Jet pressure 3.0 to 4.0 kgf / mm ² Drum inner diameter φ300 to 800 mm The table shows the manufacturing results under various V _D / V _j , θ, ψ conditions.

Where V _D is the drum peripheral speed (m / s), V _j 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
When entering the surface of the cooling liquid, it is the angle (entry angle) formed by the tangent line at the landing point on the surface and the vertical direction, and ψ is the angle measured from the rotation direction of the drum from the point where the molten metal jet lands on the surface of the cooling liquid. Angle to exit position (90 °
≦ φ ≦ 300 °).

In NO.1 to NO.6, the approach angle θ60 ° and the exit angle ψ2
Fix it at 40 ° and change the jet pressure to change V _D / V _j .

With NO.1 to NO.3 within the range of conditional expression (1), the straight continuous line was successfully taken out. In other cases, the twisted line is the exit 1.
It gets stuck at 4 or breaks.

In NO.7-NO.10, V _D / V _j
Change. Manufacturing conditions expand according to conditional expression (1),
After all, if the range is shifted (NO.9, NO.10), it will not work.

In NO.11 to NO.13, the outlet position ψ is changed. ψ
Therefore, the upper limit of conditional expression (1) changes, but if it exceeds this condition, wire breakage will occur in the middle.

In NO.14, approach angle θ65 °, outlet position ψ240
When it was set to °, the manufacturing conditions became extremely tight, and the process got stuck on the way.

(Effect of the invention) By finding the optimum manufacturing conditions, it is possible to manufacture a stable continuous wire.

Further, the present invention is not only suitable for the production of amorphous wire rods, but also applicable to the technique for directly producing ultrafine wires of other metals from a molten metal, so that its practicality is extremely high.

[Brief description of drawings]

FIG. 1 is a cross-sectional view schematically showing a method for continuously producing thin metal wires. FIG. 2 is a plan view of an apparatus for continuously producing 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 line VV of FIG. 1 ... Rotary drum, 2 ... cooling water, 3 ... molten metal jet nozzle, 4 ... water supply pipe, 5 ... belt conveyor, 14 ... outlet.

Claims (1)

[Claims] 1. A cooling water is supplied into the drum while rotating the cylindrical drum to form a cooling water layer along the inner peripheral surface of the drum by centrifugal force, and a molten metal is nozzled from the inside of the cooling water layer. Through the cooling water layer to solidify and guide it toward the outlet through centrifugal force, continuously discharge the metal solidification wire together with the cooling water from the outlet, and take out the thin metal wire to the outside of the drum. In the continuous manufacturing method of thin metal wires, the drum peripheral speed V _D , the molten metal jet flow velocity V _j , the angle θ formed by the molten metal jet entering the cooling water surface with the vertical line, and the point where the molten metal jet lands on the cooling water surface To the position of the outlet from the angle ψ A method for continuously producing fine metal wires, characterized in that the production is performed so as to satisfy the above condition.