JPH02297913A - Method and apparatus for peeling of insulating film of magnet wire - Google Patents

Abstract

PURPOSE:To eliminate remainder of melted cake and to peel an insulating film without decreasing strength of a lead by inserting a magnet wire into a metal tube, and heating the tube from externally. CONSTITUTION:A magnet wire 1 is inserted into a metal tube 6 having a peeling length. When the tube 6 is heated with a laser light 7, the insulating film 3 of the wire is melted and peeled. Since there is almost no air inside 8 of the tube 6, the film 3 is not vigorously burned, the lead 2 is not melted, the air inside 8 the tube 6 is abruptly expanded to momentarily discharge the melted cake 9 of the film 3, burning gas out of the tube 6. Accordingly, the case 9, the gas are not adhered to the surface of the lead 2, the inner wall of the tube 6.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for connecting the terminals of magnet wires constituting a coil such as a stator coil of a motor or a rotary transformer to other conductive parts by applying an insulating coating on the surface. This invention relates to a peeling method and device.

[Summary of the invention]

A method and apparatus for removing an insulating coating of a magnet wire, in which a magnet wire is inserted into a metal tube and the metal tube is heated from the outside to melt and peel off the insulating coating of the magnet and wire. There is no left,
In addition, peeling is performed without reducing the strength of the conducting wire.

[Conventional technology]

As shown in FIG. 2, the magnet wire 1 has an insulating coating 3 made of, for example, polyurethane resin or polyester resin on the outer periphery of the conducting wire 2, and a fused film made of, for example, polyvinyl butyral resin on the outer periphery of the insulating liquid 113. It has a coating 4. There is also a magnet wire 1 that does not have the adhesive coating 4 and only has the insulating coating 3. Below, insulating coating 3:
The above-mentioned fusion coating 4 is included. FIG. 3 shows an example in which such a magnet wire 1 is wound into a coil 5.

Normally, when winding the magnet wire l to form a coil 5, insulating the terminal of the coil 5 before or after winding the coil 5 in order to couple the terminal of the coil 5 to another conductive part to obtain continuity. It is necessary to peel off the coating 3. Conventionally, methods for peeling off the insulating coating 3 include a method of mechanically peeling off the insulating coating 3 and a method of applying heat to melt or burn the insulating coating 3 and peeling off. Japanese Patent Laid-Open No. 63-40311 discloses a method of peeling off an insulating film by heating.

FIG. 4 shows a conventional mechanical peeling method and its apparatus. Three cutters 3 are placed on the insulating coating 3 of the moving magnet wire l.
1 and peel off the insulating liquid 1113 while rotating the cutter 31. FIG. 5 shows the magnet wire 1 separated by the method and device shown in FIG.
22 is a peeled part of the insulation coating 3, an unpeeled part of the insulation coating 3,
Reference numeral 23 indicates a boundary between the peeled portion 21 and the unpeeled portion 22.

FIG. 6 shows a conventional peeling method using heat from a laser beam and an apparatus therefor. A laser beam 33 is irradiated from a laser device 32 to the moving magbod 1-wire 1, and the insulating coating 3 is burned and peeled off by the energy. Figure 7 shows the 6th
The magnet wire 1 which has been peeled off using the method and apparatus shown in the figure is shown, 21 is a peeled part of the insulating coating 3, and 22 is a part of the insulating coating 3 that is not peeled off. Burnt scum 24 obtained by burning the insulating liquid II 3 is attached to the peeled portion 21 .

FIG. 8 shows a conventional peeling method using the heat of a solder bath.

The end of the coil 5 made by winding the magnet wire 1 is placed in a solder bath 34 at a temperature of 380 to 400°C.
Pull up after a second. Then, as shown in FIG. 9, the insulating coating 3 of the magnet wire 1 at the end of the coil 5 is melted, and the peeled portion of the insulating coating 3 is soldered. ,
25 indicates a soldering section. Reference numeral 26 denotes molten residue of the insulating film 3 adhering to the boundary between the solder-treated portion 25 from which the insulating film 3 has been peeled off and the unpeeled portion 22 of the insulating liquid IFI3.

[Problem to be solved by the invention]

By the way, the conventional mechanical peeling method and device shown in FIG. 4 have problems in that not only the mechanism of the cutter 31 is complicated, but also the adjustment is complicated. Moreover,
The life of the cutter 31 was also limited. Moreover, the wire diameter is 0.
In the case of thin magnet wires of 1 mm or less, it was extremely difficult to peel off only the insulating liquids MJ and 3 without damaging the conducting wires 2.

Moreover, stress concentration tends to occur at the boundary 23 between the peeled part 2 and the unpeeled part 22 shown in FIG. 5, which causes wire breakage when winding the coil 5 or mounting the coil 5.

The conventional peeling method and device using the heat of laser light shown in FIG. 6 have the problem that it is very difficult to control the laser to burn only the insulating coating 3 without burning the conductor 2. there were. Furthermore, even if only the insulating coating 3 is burned, there is a problem in that the combustion residue 24 adheres to the peeled portion 21, as shown in FIG.

In the conventional peeling method using the heat of a soldering bath shown in FIG. 8, as shown in FIG. 9, the solder treated area 25 from which the insulation coating 3 has been peeled off is hardened by the solder, making it difficult to mount the coil 5. This caused a disconnection. Furthermore, there was a problem in that molten scum 26 adhered to the boundary between the half-1 treated area 25 where the insulating coating 3 was peeled off and the non-peeled area 22. Furthermore, in the case of a heat-resistant insulating coating such as polyesterimide resin or polyamideimide resin, it has been impossible to peel off the insulating coating at the temperature of the solder bath.

[Means for Solving the Problems] In the method and apparatus for peeling off the insulation coating of a magnet wire of the present invention, the insulation of the magnet wire is removed by inserting the magnet wire into a metal tube and heating the metal tube from the outside. Melt and peel off the film.

[Effect]

Since the metal tube into which the magnet wire is inserted is heated from the outside, the insulation coating is uniformly heated through the metal tube, so the insulation coating can be stably and uniformly peeled off over a wide range, and the metal Because the amount of air inside the tube is small, the conductor will not be burned, so only the insulating coating can be reliably removed, and the thermal expansion of the air inside the metal tube can be used to remove molten scum and combustion gas. Since these are discharged to the outside of the metal tube, they do not adhere to the surface of the conductor or the inner wall of the metal tube, and the boundary between the peeled and unpeeled parts of the insulation coating is smooth, reducing stress concentration. This does not occur, and the strength of the entire magnet wire does not decrease significantly.

〔Example〕

Hereinafter, a method for peeling off an insulating coating of a magnet wire according to the present invention will be explained with reference to FIG.

As shown in FIG. 2A, the magnet wire 1 has an insulating liquid 1!23 on the outer periphery of the conducting wire 2. The magnet wire 1 is inserted into a metal tube 6 made of stainless steel, for example. The length of the metal tube 6 is determined by the length of Wa used to peel off the insulating liquid 11 and 3.
It has a length of 1. Where you want to peel off the insulation coating 3,
For example, the magnet wire 1 is moved to the winding start position.

As shown in FIG. 3B, the heating means 7 irradiates, for example, a laser beam, and the metal tube 6 is heated by the energy thereof. Then, the insulating coating 3 of the magnet wire 1 on the inside 8 of the metal tube 6 melts and peels off. Inside 8 of metal tube 6
Since there is almost no air in the insulating film 3, the insulating coating 3 is not violently burned and the conducting wire 2 is not melted. Moreover, the air inside 8 of the metal tube 6 expands rapidly due to the rapid temperature rise, and the molten residue 9 of the insulating liquid 1113 and combustion gas are instantly discharged to the outside of the metal tube 6. Therefore, molten scum 9 and combustion gas do not adhere to the surface of the conducting wire 2 or the inner wall of the metal tube 6.

As shown in FIG. 4C, the laser beam irradiation is stopped and the heating is stopped. What should be noted here is that the shape of the boundary 10 between the peeled portion and the unpeeled portion of the insulating coating 3 is smooth as shown in the figure. Therefore, stress is not concentrated on the boundary portion 10, and a decrease in strength of the magnet wire 1 can be prevented.

As shown in FIG. 3D, the magnet wire 1 is then moved (the amount of movement is set to 2) to a position where the insulating coating 3 is to be peeled off, for example, to the position at the end of the winding. As shown in FIG. 3E, the insulating film 3 is peeled off by irradiating with laser light and heating.

In the same figure (F), heating is stopped.

Although the explanation has been given using an example in which a laser beam is used as the heating means 7, the heating means 7 is not limited to the laser beam, and it is also possible to heat with hot air, an electric heater, or the like.

The length of the peeling of the insulating coating 3 is adjusted by the length of the metal tube 6. Metal tube 6 for the outer diameter of magnet wire l
The inner diameter and outer diameter are adjusted by the heating conditions of the heating means 7 such as a laser beam. Further, the length required for the winding of the coil 5 can be adjusted by adjusting the movement amount 2 explained with reference to FIG.

By repeating steps (A) to (F) in this way, the insulating coating 3 can be peeled off continuously or intermittently without cutting the magnet wire 1 midway.

Returning to FIGS. 2A and 2B, the apparatus for stripping the insulating coating 3 of the magnet wire 1 according to the present invention will be described.

The magnet wire 1 peeling device of the present invention includes a metal tube 6 made of stainless steel, for example, into which the magnet wire 1 is inserted, and a heating means 7 such as a laser beam for heating the metal tube 6. The metal tube 6 is heated by the heating means 7 to melt and peel off the insulating coating 3 of the magnet wire 1.

(Effects of the Invention) The method and apparatus for peeling off the insulating coating of a magnet wire according to the present invention has the following effects.

(1) Since the insulating coating is uniformly heated through the metal tube, the insulating coating can be stably and uniformly peeled off over a wide range.

(2) Since the amount of air inside the metal tube is small, only the insulating coating can be reliably removed without burning the conductor.

(3) Since the thermal expansion of the air inside the metal tube is used to discharge the molten residue of the insulating coating and combustion gas to the outside of the metal tube, these do not adhere to the surface of the conductor or the inner wall of the metal tube.

(4) The length of peeling of the insulation coating can be easily adjusted by simply changing the length of the metal tube.

(5) Coils of any length can be accommodated by changing the moving distance of the magnet wire and the timing of heating the metal tube.

(6) Since the boundary between the peeled portion and the unpeeled portion of the insulating coating is smooth, stress concentration does not occur and the overall strength of the magnet 2 and the wire is not significantly reduced.

(7) Unlike mechanical peeling methods, since it is non-contact, it is possible to stably peel off the insulation coating even with a magnet wire having a conductor diameter of 0.1 mm or less.

(8) In a mechanical peeling device in which the peeling cutter rotates, the cross-sectional shape of the magnet wire must be circular;
The insulating coating peeling method and apparatus of the present invention can be applied to any cross-sectional shape, such as an ellipse, a square, or a flat shape.

(9) It is impossible to peel off a heat-resistant insulation coating such as polyesterimide resin or polyamideimide resin with a peeling method that uses the heat of a solder bath, but the method of peeling off an insulation coating of the present invention Since this device can obtain high temperatures, it is also possible to peel off heat-resistant insulating coatings.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing the insulating wave pattern peeling method and apparatus of the present invention. FIG. 2 is a cross-sectional view of the magnet wire. FIG. 3 is a perspective view of the coil. FIG. 4 is a perspective view showing a conventional mechanical peeling method and its apparatus. FIG. 5 is a perspective view showing a magnet wire separated by the method and apparatus of FIG. 4. FIG. 6 is a perspective view showing a conventional peeling method and apparatus using laser heat. FIG. 7 is a perspective view showing a magnet wire peeled off by the method and apparatus shown in FIG. Fig. 9 is a perspective view showing the magnet wire peeled off by the method shown in Fig. 8. 1. Magnet wire 2.
−−−−・−・・Conductor 3・−・−・・・−・・−Insulating coating 4・−・・−・
−・−・・−・Fusion coating 5−・−・−・−・・−Coil 6−・・−・・・−Metal tube

Claims (2)

[Claims] 1. A method for removing an insulating coating on a magnet wire, the method comprising inserting a magnet wire into a metal tube and heating the metal tube from the outside to melt and peel off the insulating coating of the magnet wire. 2. A metal tube into which a magnet wire is inserted and a heating means for heating the metal tube are provided, the magnet wire is inserted into the metal tube, and the metal tube is heated from the outside by the heating means, whereby the insulation coating of the magnet wire is heated. Magnet wire insulation coating stripping device that melts and strips the magnetic wire.