JP2000091066A - Levitating melter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable plating of a high melting point material, and to enable high purity plating by melting metal by upward projecting the upper end of the molten metal melted in a levitating melter from the upper end of a crucible. SOLUTION: Metal being inputted to a copper-made crucible 1 and forming a plating layer induces an eddy current by interlinking a magnetic flux entering the crucible 1 through a slit of the crucible l in the magnetic flux induced by an induction coil 2, and is melted by Joule heat by resistance of the metal. A part of the magnetic flux induced by the induction coil 2 generates an eddy current in the crucible by also interlinking with the crucible 1. This eddy current and an eddy current flowing in the metal in the crucible 1 generate resiliency since the direction is in inverse on the mutually opposed surfaces, and when the metal becomes a nonmagnetic substance by being heated to a Curie point or more, the metal levitates by separating from the crucible 1, so that the upper end of molten metal 1a is held by projecting upward from the upper end of the crucible 1 by controlling an electric current of the induction coil 2 in the strengthening direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to plating of a wire that passes straight through a molten metal by utilizing the fact that the upper end of a molten metal that has been floated and melted can protrude above the upper end of a crucible and can be held. The present invention relates to a flotation / melting apparatus for manufacturing fine wires by using a rotating roller.

[0002]

2. Description of the Related Art Conventional metal plating methods such as an electroplating method and a so-called immersion plating method in which a metal is immersed in a molten metal pool and plated are used. Among them, the electroplating method is a plating method that utilizes the fact that two electrodes are immersed in an electrolyte solution and a metal is deposited on the cathode when a DC voltage is applied between the electrodes.

[0003] On the other hand, the immersion plating method is a melting furnace (mainly a channel induction furnace, in which a metal forming a plating layer is melted and held, and a steel sheet provided with a refractory layer inside thereof), as is found in, for example, galvanizing. An electric furnace with a heating wire outside the tank is used.)
(For example, a steel plate) is dipped under the roller in the melting furnace, immersed, taken out, and plated.

[0004]

However, in the conventional structure, a refractory container or a steel plate provided with a refractory layer inside is used for melting and holding the metal forming the plating layer. There's a problem. There was a problem that refractories were consumed during use and mixed into the molten metal, so that high-purity plating was difficult.

[0005] Since a refractory container is used to dissolve and hold the metal forming the plating layer, it has been difficult to dissolve and plate the high melting point material. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a flotation melting apparatus which enables plating of a high melting point material and enables high purity plating.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 has a vertically elongated slit which is formed in a bottomed cylindrical shape and which is radially provided at substantially equal intervals in a cylindrical portion. A crucible made of a good conductive metal, an induction coil provided on the outer diameter side of the crucible, and a levitation melting apparatus provided with an AC power supply for supplying a high-frequency current to the induction coil, the upper end of the molten metal being melted in the levitation melting apparatus Is projected above the upper end of the crucible to dissolve.

According to a second aspect of the present invention, in the flotation melting apparatus according to the first aspect, the wire is plated so as to pass through a molten metal protruding above the upper end of the crucible. Features. The flotation melting device that melts and holds the metal that forms the plating layer places the material to be melted in an alternating magnetic field generated to have a predetermined distribution,
Using eddy current flowing in the material to be melted by electromagnetic induction, simultaneously giving both induction heating and buoyancy by electromagnetic force,
This device obtains a product of a predetermined material and size by melting the material in a state in which the material does not come into contact with another object such as a crucible or in a state in which the material does not contact the side of the crucible but only contacts a part of the bottom of the crucible. It is water-cooled even when it comes into contact with the crucible during melting, so there are very few foreign substances mixed in, it can be melted even with a material with a high melting point, and it has a small heat conduction loss. In addition, it is used for materials requiring high purity, for example, dissolving materials such as titanium and silicon.

[0008] By increasing the exciting force of the induction coil, the molten metal can be held so that the upper end of the molten metal protrudes above the upper end of the crucible so as to squeeze the molten metal from the outer peripheral side. According to the above configuration, by holding the molten metal protruding above the upper end of the crucible and holding the molten metal in a non-contact manner and passing the wire through the molten metal, the molten metal adheres to the wire to form a plating layer. Will be possible.

Further, since the molten metal of the metal forming the plating layer is melted and held in non-contact with the crucible, it is possible to maintain high purity without contamination from the crucible and to melt and hold the high melting point metal. I do. According to a third aspect of the present invention, there is provided the flotation and melting apparatus according to the first aspect, further comprising: a rotating roller provided in contact with an upper end of the molten metal protruding upward from the upper end of the crucible; To produce small lumps.

According to the above construction, the molten metal that has come into contact with the rotating roller is separated from the molten metal portion by the roller and jumps out in the tangential direction of the rotation of the roller as a small lump or a thin line, and solidifies in the air. It becomes possible to produce small lumps or fine wires.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing a main part of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an outlet 1 which is formed in a cylindrical shape with a bottom and discharges a melt formed at the bottom.
b, 1c are water-cooled copper crucibles having plugs for closing the outlet 1b, and vertically elongated slits radially provided in the cylindrical portion at substantially equal intervals, and 1a is the material to be melted dissolved in the copper crucible 1. The molten metal 2 is an induction coil that gives an induction heating energy and a levitation force to the material to be melted by using eddy current flowing by electromagnetic induction, the AC power supply 3 supplies an electric current to the induction coil 2, and the plating 4 is Reference numeral 5 denotes a winding machine for the wire 4. In FIG. 1, a copper crucible 1 having an outlet 1b is shown.
An induction coil 2 provided on the outer peripheral side of the copper crucible 1; an AC power supply 3 for supplying a high-frequency current to the induction coil 2
Forms a levitation melting apparatus, and the metal forming the plating layer put into the copper crucible 1 is made of the copper crucible 1 in the magnetic flux induced by the high frequency current supplied from the high frequency power supply 3 to the induction coil 2. The flux interlinks with the magnetic flux that has entered the crucible 1 through the slit, induces an eddy current, and is heated and melted by Joule heat due to the resistance of the metal.

Further, part of the magnetic flux induced by the induction coil 2 also links with the copper crucible 1 and generates an eddy current in the copper crucible 1 because the copper crucible 1 is made of metal.
The eddy current and the eddy current flowing in the metal in the copper crucible 1 are opposite to each other on the surfaces facing each other, so that a repulsive force is generated and the metal is heated above the Curie point and becomes non-magnetic and separates from the crucible 1. The upper end of the molten metal 1a protrudes above the upper end of the copper crucible 1 and is held by controlling the direction in which the current of the induction coil 2 is strengthened.

Reference numeral 5 denotes a winding machine for the wire 4. The wire 4 wound on one drum passes through the molten metal 1 a protruding above the crucible 1 while being wound on the other drum, and is plated. . Even if the molten metal loses the buoyancy force, the molten metal 1a is discharged from the outlet 1b at the bottom of the copper crucible 1 by the surface tension.
Does not flow out, but for more certainty the plug 1c
Is installed.

FIG. 2 is a block diagram showing a main part of an embodiment of the present invention. FIG. 2 differs from FIG. 1 in that a part of the bottom of the molten metal 1a is brought into contact with the copper crucible 1 to form a solidified layer of the molten metal at that part instead of completely floating and melting the molten metal 1a. The point is that the remaining molten metal 1a is melted while receiving it. Thus, the bottom of the molten metal 1a is placed in the copper crucible 1
The movement of the molten metal 1a is stabilized by contacting the upper part, and the upper part can also be protruded stably. In this case, since the solidified layer exists on the outlet 1b, the molten metal 1a does not flow out of the outlet 1b, and when a power failure or the like occurs during melting, the solidification tank is activated by the energy of the molten metal 1a. Although the molten metal 1a does not flow out due to surface tension even if is melted again, a plug 1c is attached to the outlet 1b for the sake of certainty.

FIG. 3 is a block diagram showing a main part of another embodiment of the present invention. FIG. 3 differs from FIG. 1 in that the heating method of the levitation melting apparatus is not one induction coil and one power supply method, but the induction coils are separately provided vertically and the upper induction coil 2 is provided.
a is mainly supplied from a high-frequency AC power supply 3a that gives melting energy, and the lower induction coil 2b is mainly supplied with a current from a low-frequency AC power supply 3b that gives levitation force. This is the method used.

As described above, the input and output of the induction coil 2b are increased and decreased by using the two induction coils and the two power supply system.
Since the levitation force applied to the molten metal 1a can be increased or decreased, the height at which the molten metal 1a projects from the upper end of the copper crucible 1 can be controlled by increasing or decreasing the input of the induction coil 2b. Although the case where the wire 4 is plated is shown in FIGS. 1 to 3, the thin plate can be plated by passing a thin plate or the like through the molten metal instead of the wire 4.

FIG. 4 is a block diagram of a main part of another embodiment of the present invention. In FIG. 4, reference numeral 1 denotes an outlet 1 which is formed in a cylindrical shape with a bottom and discharges a molten metal formed at the bottom.
b, and a water-cooled copper crucible having vertically elongated slits radially provided at substantially equal intervals in a cylindrical portion, 1a is a molten metal in which the material to be melted is melted in the copper crucible 1, 2a is a material to be melted, An upper induction coil that mainly supplies induction heating energy by using an eddy current flowing by electromagnetic induction, and a lower induction coil that mainly gives a levitation force to a material to be melted by using an eddy current flowing by electromagnetic induction, 3a. 3b is an induction coil 2
Reference numeral 6 denotes an AC power supply for supplying an electric current to 2a and 2b, and 6 denotes a rotating roller for causing the molten metal 1a to fly by a claw 6a provided on the outer periphery into a small lump or a thin wire.

FIG. 4 differs from FIG. 1 in that instead of plating the molten metal protruding above the upper end of the crucible through a wire, the molten metal protruding above the upper end of the crucible is skipped by a rotating roller to form a fine wire or small lump. The point is that it is manufactured. In the embodiment shown in FIG. 4, one induction coil and one power supply may be used as in the case of FIG.

[0019]

According to the present invention, dissolution of a high melting point metal,
Dissolution of alloys and dissolution of various metals, such as dissolution of active metals by setting the dissolution atmosphere to an inert gas atmosphere, can be performed in one crucible.Therefore, there is no need to change the equipment depending on the material used to form the plating layer. This has the effect of being able to cope with production, and has the effect of improving the quality because it can be dissolved with high purity without contamination from the crucible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a main part of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a main part of an embodiment of the present invention.

FIG. 3 is a configuration diagram of a main part of another embodiment of the present invention.

FIG. 4 is a configuration diagram of a main part of another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crucible 1a Melt 1b Outflow port 2 Induction coil 2a Upper induction coil 2b Lower induction coil 3, 3a, 3b AC power supply 4 Wire rod 5 Winding machine 6 Rotary roller 6a Claw

Claims (3)

[Claims] 1. A crucible made of a good conductive metal having vertically elongated slits which are formed in a cylindrical shape with a bottom and are provided radially at substantially equal intervals in a cylindrical portion, and an induction coil provided on the outer diameter side of the crucible. A levitation and melting apparatus provided with an AC power supply for supplying a high-frequency current to an induction coil, wherein the levitation is performed by projecting an upper end of a molten metal to be melted in the levitation and melting apparatus above an upper end of the crucible. Melting equipment. 2. The flotation and melting apparatus according to claim 1, wherein the wire is plated so as to pass through a molten metal projecting upward from an upper end of the crucible. 3. The flotation and melting apparatus according to claim 1, further comprising: a rotating roller provided in contact with an upper end of the molten metal protruding upward from an upper end of the crucible;
A flotation melting device for producing thin metal wires and small lumps.