JPH06253431A - Method for removing insulating coating of conductive wire therefor - Google Patents

Abstract

PURPOSE:To provide a method of surely exfoliating an insulating coating into desired dimension without breaking it provided on a conduct wire, and its device. CONSTITUTION:The first electrode 14 and the second electrde 16 are made of molybdenum plates. The first electrode 14 is pressed from above after placing a litz wire 18 on the second electrode 16, and here it is pressed to be conductive. Accordingly, the cover of the conductive wire inside the litz wire 18 being made by twisting a plurality of conductive wire is also fused, and is led out. Hereby, it follows that the insulating coating at the winding start part of the litz wire 18 and the winding end part is exfoliated along the width of the first electrode 14 and the second electrode 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing an insulating coating on a conductor wire, and more particularly, to an insulating coating on a part of a bundle of conductor wires, for example, a winding start portion and a winding end portion. The present invention relates to a method and an apparatus for removing an insulating coating film of a conductive wire, which enables efficient removal of the metal to a desired size without using mechanical means.

[0002]

2. Description of the Related Art For example, a cathode ray tube is equipped with a deflection coil for deflecting an electron beam. Conventionally, a bundled single wire or litz wire has been used for this deflection coil. Litz wire is generally a conductor with a substantially circular cross section,
It is composed of a coating of polyester imide or the like that insulates and coats the conductors. In relation to the deflection coil, for example, 7 conductors are bundled in a twisted yarn shape, and further bundled into 7 to 15 bundles and wound around the yoke on the cathode ray tube. There is. In such a bundled single wire or litz wire, after being wound around a cathode ray tube yoke, a relatively large current is passed to generate heat, and the insulating coating of each litz wire is thermally melted and removed. To mold as.

Therefore, in order to flow a large current in order to melt and remove the insulating coating of the bundled single wire or litz wire as described above, a part of the bundled single wire or litz wire, for example, a winding start portion thereof, It is necessary to remove the insulating coating on the winding end portion in advance.

[0004]

However, in the case of the litz wire, the diameter of the conductor wire itself that constitutes the litz wire is small, for example, about 0.1 to 0.2 mm, and it is easy to break the wire, and the litz wire is bundled into about 7 wires. Since the number of the conducting wires constituting the litz wire is increased, the number of conducting wires constituting the litz wire is increased, and it is substantially impossible to mechanically peel off the insulating coating at the winding start portion and the winding end portion. It is possible. That is, when a mechanical force is applied for peeling, the wire is thin and easily cut.

Further, as another method, a terminal made of a conductor having a U-shaped cross section is used, a litz wire is placed inside the terminal, and the terminal is pressed by the electrodes from above and below to generate Joule heat. A method in which the insulating coating is melted by melting the insulating coating is also considered.

However, even in this case, the molten insulator adheres to the inside of the terminal and cannot be reused. In addition, it is costly to use the terminal as described above, and the peeling portion of the insulating film required for the winding start portion and the winding end portion is, for example, 10 m.
It will be difficult to set it to m or more.

In addition to this, a method of generating an induction voltage by using a high frequency induction device, heating the litz wire with this induction voltage, and then brushing to remove the insulating coating is also conceivable.

However, in this high frequency heating system,
It is difficult to melt the coating of the conductive wire that has entered the inside in the form of a twisted thread, since only the coating of the conductive wire of the outer part that constitutes the litz wire is melted. Moreover, when the insulating film is melted, unnecessary smoke is generated, and when the brush is tried to be removed, the conductors in the shape of a twisted twisted yarn become separated, and many conductors must be aligned again in the next step. However, more complicated processes are required.

The case of a bundle of single wires also has the same problem as the litz wire.

The present invention has been made in order to overcome the above-mentioned various inconveniences, and has a desired width and is capable of efficiently removing an insulating coating without cutting the conductor, thereby removing the insulating coating. It is an object to provide a method and an apparatus thereof.

[0011]

In order to achieve the above object, a method according to the present invention is one in which a bundle-like conductor wire coated with an insulating coating is placed on one electrode having a predetermined width, and the other wire is placed on the other electrode. By displacing an electrode having a predetermined width, the conductor is pinched by the two electrodes,
Next, an electric current is applied to generate Joule heat, and the insulating coating of the conductor is melted and removed by the electrode.

Further, the device according to the present invention supplies a current to the first electrode having a predetermined width, the second electrode having a predetermined width corresponding to the coating width of the conductive wire to be removed, and the respective electrodes. A power source, and the first and second electrodes can be moved toward and away from each other.

[0013]

In the method and apparatus for removing an insulating film of a conductor according to the present invention, a bundle of conductors is placed on a first electrode having a predetermined width, and a second electrode is brought close to the first electrode to move the bundle. Pinch the wire. By applying an electric current in this state, the coating film of each conducting wire is melted. At this time, in the bundle of conductor wires, the molten coating film of the inner conductor wire is also led to the outside and removed because the conductor wire itself is pinched by the first electrode and the second electrode.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a device for removing an insulating coating of a conductor according to the present invention will be described in detail below with reference to the accompanying drawings, with reference to preferred embodiments.

First, a schematic description of this embodiment will be given with reference to FIG. In FIG. 1, reference numeral 10 indicates a first welded portion, reference numeral 12 indicates a second welded portion, which is substantially constituted by a welding transformer. First weld 10
Is a plate-shaped first electrode 1 made of molybdenum on the secondary side.
4 are connected, while the second welded portion 12 is also provided with a plate-shaped second electrode 16 made of molybdenum. In this case, the first electrode 14 and the second electrode 16 are each selected to have a thickness of 1 mm, a width of 15 mm, and a length of 40 mm.

The operation mechanism of the first electrode 14 and the second electrode 16 of the insulating film removing apparatus will be described in detail with reference to FIG. The apparatus includes a displacement member 22 configured to be displaceable on a rail member 20 formed in a direction perpendicular to the drawing.
It is provided in. A rail 24 is formed in the displacement member 22 in the Z direction, and stopper support members 26a to 26c having screw holes are formed at predetermined positions.
By inserting bolts into the screw holes of the stopper support members 26a and 26c one by one, the stoppers 28 and 30 are
And a screw hole of the stopper support member 26b is
The stoppers 32 and 34 are formed by screwing two bolts upward and downward, respectively.

Holding members 36a and 36b are engaged with the rail 24 of the displacement member 22 so as to be displaceable in the Z direction.

A cylinder 38 is provided on the upper surface of the holding member 36a. Rod 40 of the cylinder 38
Penetrates the holding member 36a and engages with the holding member 36b. The holding member 36a includes an electrode member 42.
a is fixed via the insulating member 44a. The electrode member 42a has a bulging portion 45a formed at the tip, a ceramic member 46a is attached to the tip, and the first electrode 14 is provided so as to cover the ceramic member 46a and the bulging portion 45a. There is. The electrode member 42a
The inside of the power supply unit 48a is connected to a power source (not shown),
It is electrically insulated from each other by an insulating member 52a so as not to short-circuit 50a.

The holding member 36b is the holding member 36a.
The same reference numerals are assigned to the same components, and detailed description thereof will be omitted.

In the above-mentioned structure, for example, a process of preparing eight bundles of litz wires 18 in which seven conductor wires are twisted to form one bundle and removing the insulating coating on these ends will be described below. .

First, eight bundled wires 18a are formed on the second electrode 16.
Are placed adjacent to each other. Then, the cylinder 38 is driven to displace the rod 40 in the Z1 direction. Therefore, the holding member 36a is guided by the rail 24 of the displacement member 22 and is displaced in the Z2 direction. As a result, the holding member 36a is brought into contact with the stopper 32 to stop the displacement in the Z2 direction. By continuing the driving of the cylinder 38, the holding member 36b then starts to be displaced in the Z1 direction,
It is displaced until it comes into contact with the stopper 34. As a result, the electrode members 42a, 42 fixed to the holding members 36a, 36b.
The first electrode 14 and the second electrode 16 of b clamp the bundle wire 18a.

Further, electric currents are supplied from the power supply portions 48a and 48b to the first electrode 14 and the second electrode 16, respectively, and a welding current is caused to flow between the electrodes 14 and 16. As a result, Joule heat is generated at the electrodes 14 and 16. That is, the second
The first electrode 14 is lowered with respect to the twisted yarn-shaped bundle wire 18a placed on the electrode 16, and the bundle wire 1 is formed by the both electrodes 14 and 16.
8a is pressurized and there is a large current, for example 2k
If A is flowed, the insulating coating of the conductive wire forming the bundled wire 18a is formed by Joule heat and the width of the first electrode 14 and the second electrode 16 is 15
It melts up to about mm. As a result, as shown in FIGS. 3 and 4, the molten coating film of each conductive wire flows out around the bundle wire 18a, and the insulating coating film having a desired width is removed. In this case, the peeling length of the insulating coating was about 13 mm, the applied pressure was 15 kgf, and the energization time was 60 cycles.

5 and 6 show the litz wire 1 after applying pressure.
8 shows a vertical sectional view of FIG. As can be easily understood from the figure, all the insulating coatings of the individual conductors forming the litz wire 18 are melted and pushed out by the pressing force, and the conductors are in a state of mutual conduction. When the cross section of the conducting wire in the film peeling portion was observed, it was confirmed that a fibrous structure was observed and that the conducting wire was not damaged at all. When the cross section of the close contact portion of the conductive wire was observed, it was confirmed that there was a portion that was recrystallized and was in a bonded state, as shown in FIG. 7.

Furthermore, in this embodiment, molybdenum is used for the first and second electrodes, respectively, but it was confirmed that the same effect can be obtained by using a heat resistant material such as tungsten.

As a second embodiment, a description will be given of a plurality of conductive wires coated with an insulating coating, which are bundled. In this embodiment, instead of removing the insulating coating of the twisted yarn-like bundled wire like the litz wire, a plurality of insulating coatings of the conductor wire made of a single wire are simultaneously removed.
In this embodiment, the first electrode 14 and the second electrode 16
Is made of a heat-resistant metal material such as SUS304, SUH306 (according to JIS).

Therefore, as shown in FIG.
The bundled wires 62 in which 0s are stacked in a mountain shape are set on the second electrode 16. Thereafter, the bundle wire 62 is interposed between the first electrode 14 and the second electrode 16 by operating in the same manner as in the first embodiment.
Is pinched. That is, the first electrode 14 and the second electrode 16
As the sandwiching pressure between and is increased, Joule heat is generated to break the mountain state and flatten as shown by the broken line. At this time, the conductor wire 60 forming the bundle 62 is melted by the pressure applied by the electrodes 14 and 16 and the heating by the electric current, and the conductor 6 inside the bundle 62 is melted.
The effect that the coating film of 0 was led out to the outside, and the insulating coatings of all the conductor wires 60 constituting the bundled wire 62 were suitably peeled off was obtained.

[0027]

As described above, according to the present invention, it is possible to easily peel off the insulating coating of a bundle of conductive wires within a desired range without using mechanical means. Further, the bundle-shaped conductor wire is pinched by the electrodes, and current is conducted to the electrode, whereby the coating film of the conductor wire is melted. At this time, since the bundle-shaped conductive wires are strongly pressed by the electrodes, the coating film of the conductive wires inside the bundle is also led to the outside in a molten state and removed from the bundle-shaped conductive wires. Therefore, it is not necessary to brush or the like to remove the insulating coating, and the conductor wire itself is not broken. And, in the state where the insulation film is peeled off, especially, thermally, for example, smoke damage does not occur, and furthermore, since the conductor wires are scattered, it is not necessary to arrange them in the next step. Is obtained.

[Brief description of drawings]

FIG. 1 is a schematic configuration explanatory diagram of a device for removing an insulating film of a conductor according to the present invention.

FIG. 2 is a side view for explaining the insulating coating film removing device for a conductive wire according to the present invention.

FIG. 3 is a vertical cross sectional view showing a state in which the insulating coating of the litz wire is removed according to the present invention.

FIG. 4 is a partially enlarged sectional view taken along the arrow X in FIG.

FIG. 5 is an enlarged vertical cross-sectional view of the litz wire in a state where the insulating film is removed by the insulating film removing method according to the present invention.

6 is an enlarged vertical sectional view of a portion A shown in FIG.

FIG. 7 is a vertical cross-sectional view showing a state in which adjacent Litz wires have recrystallized sites due to the implementation of the method of the present invention.

FIG. 8 is a side view illustrating the conductor insulating film removing device according to the present invention used for removing a plurality of bundle-shaped single-wire insulating coatings.

[Explanation of symbols]

10, 12 ... Welded portion 14, 16
… Electrode 18… Litz wire

Claims (6)

[Claims] 1. A bundle-shaped conductor wire provided with an insulating coating is placed on one electrode having a predetermined width, the other electrode having a predetermined width is displaced, and the conductor wire is clamped by the two electrodes, Then, an electric current is applied to generate Joule heat, and the insulating coating film of the conductive wire is melted and removed by the electrode, and the insulating coating film of the conductive wire is removed. 2. The method according to claim 1, wherein the bundle-shaped conductor wire is composed of a single wire coated with an insulation film. 3. The method according to claim 1, wherein the bundle-shaped conductive wire is a litz wire composed of a stranded wire having a plurality of insulating coatings applied thereon. 4. A first electrode having a predetermined width corresponding to the film width of the conductor to be removed, a second electrode having a predetermined width, and a power supply for supplying a current to each of the electrodes, An insulating film removing device for a conductive wire, wherein the first and second electrodes can be moved toward and away from each other. 5. The apparatus according to claim 4, wherein the first and second
The electrode is made of a heat-resistant metal material. 6. The apparatus according to claim 5, wherein the heat resistant metal material is stainless steel, molybdenum or tungsten.