JPH03212109A - Method for peeling insulating film of enameled wire - Google Patents

Abstract

PURPOSE:To improve a peeling effect by setting the position for applying a laser beam to an enameled wire to the position close to a condensing lens but avoiding a plasma-generating position in the vicinity of the focus of the condensing lens. CONSTITUTION:A laser apparatus is equipped with a heating apparatus composed of a heater 12, fan 13, etc., and constituted so as to enable blowing a heated inert gas against an enameled wire 9. When the insulting film of the enameled wire 9 is peeled, the peeled part of the enameled wire 9 is arranged in the position close to a condensing lens 4 but avoiding a plasma-generating position in the vicinity of the focus of the condensing lens 4, an inert gas is blown against the wire 9 by the heating apparatus before irradiation with a laser beam, the enameled wire 9 is heated within the range of 230-250 deg.C and a laser beam is applied thereafter. Thus, the insulating film of the wire can be peeled satisfactorily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a method for peeling an insulating film of an enameled electric wire.

[Prior Art] Enamel electric wires, which are frequently used in magnet coils of various devices, especially precision parts, have recently become thinner in diameter, and ultra-fine wires with a diameter of more than ten microns are now available.

It is necessary to peel off the insulating film of such enameled electric wires when soldering, etc., and in the case of wires with a large diameter, this is done by a mechanical method. However, in the case of a wire with a small diameter as described above, it is difficult to separate the wire using a mechanical method because the wire is easily stretched or cut. Although it is possible to remove the film by a chemical method using vine coat solvent, etc., it is troublesome in terms of management such as solution management, handling management, and safety management.

To avoid these difficulties, laser ablation methods have recently been proposed. FIG. 5 is a block diagram showing this laser stripping method. In the figure, 1 is a pulse laser with a short pulse and high peak output, and a TEACO2 laser is usually used.

2 is a laser beam, 3 is a pend mirror 4 for changing the direction of the beam 2, a condensing lens for condensing the beam 2, 5 is a condensed beam, 6 is a spreading beam, 7 is a reflecting mirror for reflecting the beam, 8 is a reflected beam, 9 is an enameled wire,
10 is the focal point of the condensing lens 4.

Laser 1 is a pulse laser with a normal pulse width of about 1.8 μSee and a peak output of about 10 megawatts or more, and a wavelength of 10.
It is a 6 μm TEAC02 laser. The oscillated laser beam 2 is bent directly downward by a bend mirror 3 and focused by a lens 4. The focused beam 5 is expanded after passing through a lens focal point 10, and a part of the expanded beam 6 illuminates the enameled electric wire 9, and the remaining beam is reflected by the reflecting mirror 7 and illuminates the enameled electric wire 9 from the opposite side. Note that the enameled wire 9 is located at the focal point of the reflecting mirror 7, and as a result, the insulating film around the entire circumference of the enameled wire 9 can be peeled off by irradiation from one direction.

[Problem to be solved by the invention] G1. - In the method for stripping an insulating film using a laser beam, the pulsed laser with a short pulse and high peak output used generates plasma by aerial destruction at the condensing point 10, and the energy of the laser beam is It is consumed only for generation and does not cause the effect of peeling off the insulation film of the enamelled wire. If the laser output is lowered to a level where plasma generation does not occur, thin wires can be peeled off, but when the wire diameter becomes large, peeling becomes impossible. Moreover, even if the film can be peeled off, the peeling is not complete and quality remains a problem. As described above, the conventional method of stripping an insulating film from an enameled wire using a laser beam has several problems.

The present invention has been made in order to solve the above-mentioned problems of conventional devices, and provides a method for stripping insulating films from enameled electric wires, which is capable of stripping from thin wires to wires with large diameters, and is also capable of stably stripping even thin wires. This is what I am trying to do.

[Means for Solving the Problem] In order to achieve the above object, in the peeling method using a laser beam according to the present invention, the position of the enameled electric wire to be irradiated with the laser beam is set to the plasma near the focal point of the condensing lens of the laser beam. At the same time, the enameled electric wire is placed at a position close to the condenser lens away from the generation position, and the following pretreatment is performed on the enamelled electric wire to provide a laser heat absorption effect upon irradiation with the laser beam.

■Heat the peeled part of the enamel wire.

■Immerse the peeled part of the enamel wire in water.

■Do not damage the peeled part of the enamel wire.

[Function] Since the laser beam irradiation position of the enameled electric wire was set close to the condenser lens, avoiding the plasma generation position near the focal point of the condenser lens, the laser beam can peel off without consuming energy for plasma generation. Because the part is heated,
Increases peeling effect.

Further, by performing pretreatment, a laser heat absorption effect is generated in the peeled portion, and the peeling effect is improved.

Embodiment of the Invention FIG. 1 is a block diagram showing an experimental method for determining the processing position of an enamelled electric wire, and numerals 4 to 10 in the figure are the same or equivalent parts in the above-mentioned apparatus. Focal length R1-95, 3ts
In a laser device using a condensing lens 4 of
Table 1 shows the experimental results for the case where the sample was placed at the position B19 of II a -93 mm.

As shown in Table 1, the wire processing position A18, which is less affected by plasma, allows for extremely stable peeling.

In addition, experiment No. 7 in Table 1 is an example of ester limide wire, but if no pretreatment is performed even at processing position B, the surface of the core wire may be peeled off even if it appears to be peeled off. This shows that the insulation coating material remains and the solder does not adhere.

In other words, it can be seen that some kind of treatment is required for the electric wire before irradiation with the laser beam.

One embodiment constructed based on these experimental results is a method for removing an insulating film from an enameled electric wire as shown in FIG.
11 is a nozzle for spraying, 12 is a heater, 13 is a circulation fan, 14 is the same or equivalent part as the device in the conventional method.
1 is a gas duct, 15 is a gas supply device, 16 is a power damper, and 17 is a processing chamber.

As shown in the figure, the laser device according to the present invention includes a heater 1
2. It is equipped with a heating device such as a fan 13, and is configured to spray heated inert gas onto the enamelled wire. When peeling off the insulating film of the enameled wire, the peeled part of the enameled wire 9 is placed in a position close to the condenser lens 4, avoiding the plasma generation position near the focal point of the condenser lens 4, and heated by the heating device described above before irradiation with the laser beam. Spray inert gas onto the wire and heat the enamel wire 9 to 230-250°C.
The material is heated in a range of As a result, the insulating film of the electric wire can be removed extremely well.
The solder also started to stick well.

FIG. 3 shows another embodiment, in which (a) is an explanatory diagram of a preprocessing method, and (b) is a configuration diagram of laser beam irradiation.

As shown in the figure, when removing the insulating film from the enameled wire, the peeled portion 20 of the wire is immersed in water 22 in a beaker 21 for seven days as a pretreatment, and after sowing, the peeled portion is irradiated with a laser beam. The results are shown in Table 1, No. 19.
We are getting good results.

FIG. 4 shows still another embodiment, in which (a) is an explanatory diagram of a pretreatment method, and (b) is a configuration diagram of laser beam irradiation.

(a) As shown in the figure, the insulating film portion of the electric wire is scratched with a cutter knife 23, and then (b) a laser beam is irradiated as shown in the figure. In this case as well, good results were obtained as shown in Table 1, No. 8.

Note that in the laser beam irradiation shown in FIGS. 3 and 4 above, the processing position of the electric wire is set at the condenser lens 4 avoiding the plasma generation position near the focal point of the condenser lens 4, as in the above embodiment.
This is a close position.

Note that the three types of pretreatment methods described above may be performed individually, or any two of them may be used in combination.

Further, the same effect can be obtained even if a cylindrical lens is used instead of a condensing lens.

[Effects of the Invention] The present invention is a method for stripping an insulating film of an enameled wire, in which the stripped portion of the enameled wire is subjected to a pretreatment effective for laser heat absorption, and then irradiated with a laser beam, and the processing position by the laser beam is focused. Since the plasma generation position near the focal point of the optical lens 4 was placed close to the condenser lens 4,
The insulating film can now be successfully removed from both small and large diameter wires.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing an experimental method for peeling off the insulation film of an enameled electric wire, Fig. 2 is an explanatory diagram of a peeling method in which the electric wire is heated and then irradiated with a laser beam, which is an embodiment of the present invention, and Fig. 3 4 is an explanatory diagram of another embodiment in which laser beam irradiation is performed after the wire is immersed in water, FIG. 4 is an explanatory diagram of another embodiment in which laser beam irradiation is performed after the insulating film of the wire is damaged, and FIG. 5 FIG. 2 is an explanatory diagram of a conventional peeling method using laser beam irradiation. In the figure, 2 is a laser beam, 4 is a condensing lens, 10 is its focal point, 11 is a spray nozzle, 12 is a heater, 13 is a circulation fan, 14 is a gas duct, 15 is a gas supply device, 16 is a power damper, 17 is the processing room, 18 is the processing position A119
is the processing position B, 20 is the peeled part of the electric wire, 22 is water, 23
is a cutter knife. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (4)

[Claims] (1) In the method for removing the insulation film of an enameled electric wire using a laser beam, before irradiation with the laser beam, pretreatment is performed to increase the heat absorbing property of the laser beam, and the processing position of the electric wire by the laser beam irradiation is A method for stripping an insulating film of an enameled electric wire, characterized in that the plasma generation position near the focal point of a beam condensing lens is avoided and the insulating film is removed at a position near the condensing lens. (2) The method for peeling an insulating film from an enameled electric wire according to claim 1, wherein the pretreatment is a method of heating the enameled electric wire. (3) The method for removing an insulating film from an enameled electric wire according to claim 1, wherein the pretreatment is a method of immersing the enameled electric wire in water. (4) The method for peeling an insulating film of an enameled electric wire according to claim 1, wherein the pretreatment is a method of damaging the insulating film of the enamelled electric wire.