JPH09174263A - Method and device for removing insulating film of covered wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently remove the insulating film from the wound part of a covered wire and improve the automation, productivity and working quality. SOLUTION: In the first stage of pulsed laser irradiation process, a pulsed laser beam LBQP with a high peak value is irradiatingly scanned, which is outputted in pulse oscillation using a Q-switch, in X-Y direction to the area 30 irradiated by the laser beam in the wound part 26 of a covered wire. By this scanning irradiation, an insulating film 14b is directly fractured and stripped by laser energy in the part 32 on which the pulsed laser beam LBQP is made incident, exposing a conductor 14a. Next, in the second stage of continuous wave laser irradiation process, a continuous wave laser beam LBCW is irradiatingly scanned in X-Y direction to the area 30 irradiated by the laser beam in the wound part 26 of the covered wire. By this scanning irradiation, in the wound part 26 of the covered wire, the heat from the laser energy is transferred through the conductor 14a to the area 34 unirradiated by the laser beam in the periphery or the rear side of the irradiated area 30, so that the insulating film 14b is stripped by heat even in the unirradiated area 34, exposing the conductor 14a.

Description

Detailed Description of the Invention

[0010]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for removing an insulating coating from a wound portion of a coated wire.

[0020]

2. Description of the Related Art A covered wire is an electric wire formed by covering a conductor such as copper with an insulating material such as polyimide, polyurethane or enamel. Generally, when firmly connecting such a coated wire to a rod-shaped, column-shaped, or plate-shaped conductor terminal in an electric component or the like, wind one end of the coated wire around the terminal, and then remove the insulating coating from the wound portion. The conductor is exposed, and the exposed conductor is soldered to the terminal.

FIG. 9 shows a solenoid coil as an example of an electric component (workpiece) from which the insulating coating is removed from the wound portion of the covered wire.

The solenoid coil 10 is formed by densely winding a covered wire 14 on the outer periphery of a hollow bobbin 12 having a rectangular tube shape. The covered wire 14 is an electric wire in which a thin copper wire 14a is covered with an insulating coating 14b made of polyester, for example. Two support blocks 18 and 20 are fixedly arranged at appropriate intervals on the upper surface edge of a rectangular flange portion 16 integrally formed on the upper end of the bobbin 12, and one side surface of each support block 18 and 20 has a rod shape. Conductor terminals 22, 24
Project horizontally. One end (winding end) 26 of the covered wire 14 is wound around one terminal 22, and the other end (winding end) 28 is wound around the other terminal 24. The winding process of the covered wire 14 is performed by a conventionally known winding device (not shown). Then, after the winding, a process for removing the insulating coating from the winding portions 26 and 28 is performed.

In order to remove the insulating coating from the wound portion of the coated wire as described above, conventionally, the coated wire winding portion is marked with a diamond material or the like and the insulating coating is mechanically peeled, or the coated wire winding is performed. A chemical was applied to the area to chemically decompose the insulating coating.

Since both the line drawing process and the chemical process are manually performed, it takes time and labor, and the productivity is low. Although it is possible to mechanize the line drawing process, it is difficult to adjust the line drawing position or range, and
If there are several covered wire winding parts with different shapes and sizes on one electrical part (workpiece), install multiple scoring (peeling) machines in a one-to-one correspondence with those winding parts. There is also the inconvenience of having to do it.

By the way, recently, research and development of a method of using a laser for the insulation coating removal treatment of a coated wire have progressed,
Various proposals have been made. As this type of laser, an excimer laser that generates ultraviolet rays suitable for decomposing and removing a polymer insulator is often used. However, the excimer laser has a drawback that the insulating material (coating) is difficult to decompose on the back surface of the covered wire that is not exposed to the laser light. In order to solve the drawbacks of the excimer laser, a concave mirror is arranged at the rear (back side) of the covered wire, and the concave mirror reflects the laser light so that the insulating film on the back surface of the covered wire is also irradiated with the laser light. The method is JP-A-7-782.
5 are disclosed.

A method has also been proposed in which laser light in the infrared region is used in place of the excimer laser, the insulating coating of the coated wire is heated by the light energy of this laser light, and the coating is removed by melting and evaporation. .

For example, in the method disclosed in JP-A-6-141432, a continuous wave laser beam (wavelength: 10.6 μm) generated by a carbon dioxide gas laser is focused on a spot to irradiate the insulating coating of the coated wire, and the insulating coating is applied to the insulating coating. The energy of the absorbed carbon dioxide laser light is used to melt and evaporate and remove the insulating coating. In addition, JP-A-6-141432
In the method disclosed in (1), the pulse YAG laser light (wavelength 1.064 μm) is reflected by a single reflecting mirror that rotates within a fixed angle, so that the focal point of the pulse YAG laser light is covered with an insulating film of a covered wire. The insulating coating is peeled off by the length of the movement of the converging point by linearly moving it by a certain distance.

[0100]

As described above, the conventional method for removing the insulating coating on the wound portion of the coated wire, such as the scoring process and the chemical treatment, is laborious, time-consuming, and labor-intensive. There is a problem of low productivity.

On the other hand, all the conventional laser type insulating film removing methods are for removing the insulating film at the linear end of the covered wire, and the insulating film at the portion irradiated with the laser beam can be removed. Even if it is possible, it is not possible to effectively remove the portion of the insulating coating that is not irradiated with the laser beam. For example, in the workpiece 10 as shown in FIG. 9, the covered wire 1
In order to obtain a good solder joint or electrical connection between the winding parts 26, 28 of FIG. 4 and the terminals 22, 29, the insulating film removal treatment should sufficiently remove the insulating film on the inner surface of the covered wire winding parts 26, 28. Need to be removed. However, according to the conventional method, the insulating coating remains on the inner side surfaces of the covered wire winding portions 26 and 28 where the irradiation of the laser light is substantially impossible, so that good soldering cannot be performed.

The present invention has been made in view of the above problems, and is capable of efficiently removing the insulating coating from the winding portion of the coated wire, which is advantageous for automation and improvement of productivity and processing quality. It is an object to provide a method and a device.

[0130]

In order to achieve the above object, the invention according to claim 1 of the present invention is characterized in that the insulating material is wound from a winding portion of a covered wire formed by coating a conductor with an insulating material. In a method of removing an insulating film of a covered wire, which is at least partially removed, pulse laser light is applied to at least a part of a region of the wound portion of the covered wire where the insulating film is to be removed.
Pulsed laser light irradiation step of scanning and irradiating in a direction,
After completion of the pulsed laser irradiation step, X-rays of continuous wave laser light are applied to at least a part of the region where the insulating film should be removed.
A continuous wave laser light irradiation step of irradiating by scanning in the −Y direction.

The invention according to claim 2 is the method according to claim 1, wherein the pulsed laser light is a Q-switched pulsed laser light oscillated and output using a Q-switch.

The invention according to claim 3 is the method of the invention according to claim 1 or 2, wherein the coated wire is included in a predetermined period including at least a part of an insulating film removal treatment period of the coated wire. The method is characterized by including a hot air blowing step of blowing hot air of a predetermined temperature to at least a part of the region where the insulating coating is to be removed.

According to a fourth aspect of the present invention, there is provided a device for removing an insulating film of a coated wire, wherein a conductor is coated with an insulating material, at least partially removing the insulating material from a wound portion of the coated wire. A laser oscillating means for selectively outputting an output pulsed laser light and a continuous wave laser light, and a laser light from the laser oscillating means are incident to direct the laser light to the covered wire winding portion side. A laser beam from the first scanning mirror means and a first scanning mirror means that reflects in a first direction and scans at least a part of the area of the coated wire where the insulating coating is to be removed. The laser beam is made incident and reflected toward at least a part of the region of the coated wire where the insulating coating is to be removed, and is reflected on at least a part of the region where the insulating coating of the coated wire is to be removed. Characterized in that the said first direction and including a second scan mirror means for scanning in a second direction orthogonal.

Further, the invention of claim 5 is the apparatus of the invention of claim 4, further comprising hot air supply means for blowing hot air of a predetermined temperature to at least a part of a region of the coated wire where the insulating film is to be removed. It is characterized by having.

[0180]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

The insulating film removing method of the present invention comprises two steps, a pulse laser beam irradiation step and a continuous wave laser beam irradiation step. In the pulse laser light irradiation step of the first stage, the insulating coating in the laser light irradiation region is directly removed by the laser energy using the Q switch type pulse laser light having an extremely high peak output (peak value). And
In the continuous wave laser light irradiation step of the second stage, the insulating film in the laser light non-irradiated region is removed by heating by heat conduction using continuous wave laser light.

A specific example of the method for removing an insulating film of the present invention is shown in FIG.
This will be described with reference to FIG. The object to be processed (workpiece) shown in FIG. 1 is the winding portion 26 of the covered wire 14 of the solenoid coil 10 of FIG.

As shown in FIG. 1, in the present embodiment,
A laser beam irradiation region 30 having an appropriate area (spread) is set in a part of the outer surface of the covered wire winding portion 26 (upper surface portion in this example). Then, in the pulse laser light irradiation step of the first stage, the pulsed laser light LBQP of the Q-switch type having a high peak value is scan-irradiated to the laser light irradiation region 30 to apply laser energy to the insulating coating 14b near the laser light irradiation portion. Direct destruction and peeling. Next, in the continuous wave laser light irradiation step of the second stage, continuous wave laser light LBCW is continuously scan-irradiated to the laser light irradiation region 30 for a predetermined time to irradiate the periphery of the laser light irradiation region 30 via the conductor 14a. Heat is transmitted to the laser light non-irradiated area, and even the insulating coating 14b in that area is peeled by heating.

As described above, in this embodiment, the laser light LB is
The laser light irradiation region 30 is scanned with QP and LBCW in the XY directions. Therefore, since the laser light irradiation region 30 having a considerable spread is scanned and irradiated, even if there is some error in the alignment of the covered wire winding portion 26 (28), the outside surface of the covered wire winding portion 26 (28) is It is possible to irradiate a considerable portion with the laser beams LBQP and LBCW, and it is possible to perform the insulating film removal treatment in a stable and reliable manner.

The operation of the laser beam irradiation step in this embodiment will be described in more detail with reference to FIG.

As shown in FIG. 2A, in the pulse laser light irradiation step of the first step, the pulsed laser light LBQP having a high peak value which is pulse-oscillated and output by using the Q switch is used. The laser light irradiation region 30 of 26 is scanned and irradiated in the XY directions. This scan exposure is usually 1
Although the number of times is sufficient, it may be repeated a plurality of times depending on the material and thickness of the insulating coating 14b, the laser output, the pulse period, and the like. As a result, the portion 3 where the pulsed laser light LBQP is incident
In No. 2, the insulating coating 14b is directly broken by the laser energy and peeled off to expose the conductor 14a.

In this way, the winding portion 26 of the covered wire 14
The scanning irradiation of the pulsed laser light LBQP with respect to the line has the effect of marking the conductor 14a of the winding portion 26.

In this example, the covered wire winding portion 26, in which the covered wire 14 made of an enamel wire having a wire diameter of 0.5 mmφ is wound around the terminal 22 of 1 mm square, has a length of 2 m in the X direction.
A laser beam irradiation region 30 having a length of 1.5 mm in the m and Y directions was set, and a Q switch pulse laser beam LBQP having an average output of 5 W and a repetition frequency of 2 kHz was irradiated at a scanning speed of 75 mm / s.

Next, as shown in FIG. 2A, in the continuous wave laser light irradiation step of the second stage, continuous wave laser light LBCW is used.
Is scanned and irradiated onto the laser light irradiation region 30 of the covered wire winding portion 26. This scanning irradiation is performed by scanning the continuous wave laser beam LBCW in the X-Y directions. In this scan irradiation, the continuous wave laser light LBCW is continuously irradiated to the laser light irradiation region 30, so that the heat of the laser energy is applied to the conductor 14 in the covered wire winding portion 26.
The laser light non-irradiation area 3 is transmitted around the laser light non-irradiation area 30 around the laser light irradiation area 30 or on the back side.
Also in No. 4, the insulating coating 14b is peeled off by heat and the conductor 14a is exposed.

In this example, the laser output of the continuous wave laser light LBCW is 17 W and the scanning speed is 75 mm / s.

In this way, the insulating coating 14b is peeled off from the laser light irradiation region 30 of the covered wire winding portion 26 and the laser light non-irradiation region 34 around it. The insulating coating 14b is removed by performing the same processing as above on the other covered wire winding portion 28.

After the insulating film removing process as described above is completed, both the coated wire winding parts 26 and 28 are successively immersed in the flux bath and the solder bath. When you pull it up from the solder bath,
The exposed conductor 14a of both covered wire winding portions 26, 28,
Solder is completed by joining the 14a and the terminals 24 and 26 so as to cover the solder.

According to the insulating film removing method of the present embodiment, the insulating film 14b is effectively applied even in the inner region (the region facing the outer peripheral surface of the terminal 22) where the laser beams LBQP and LBCW are not irradiated in the covered wire winding portion 26. Conductor removed 14
Since a is exposed, when the covered wire winding portions 26, 28 are immersed in the solder bath in the soldering process, the winding portion 26
A considerable amount of solder adheres between the exposed conductor 14a and the terminals 24, 26 in the inner region of the, and good solder joint can be obtained.

In the insulating film removing treatment of the covered wire in the present embodiment, when the hot air is blown together with the scanning irradiation of the laser beams LBQP and LBCW as described above, the insulating film removing effect is further enhanced. For example, as shown in FIG. 3, when hot air 36 is blown from the beginning of the insulating film removing step to the vicinity of the laser light irradiation region 30 of the covered wire winding portion 26 (28), heat is removed from the covered wire winding portion 26 (28). Reduced, softened or melted insulation coating 14
The peeling of b is promoted, and the insulating coating 14b is more effectively removed.

It is essential that the blowing of hot air in this embodiment is stopped to such an extent that it does not cause thermal decomposition of the insulating coating but softens it. This is because when the insulating coating is thermally decomposed, the organic compound is carbonized and is rather difficult to remove. The temperature at which the insulating film thermally decomposes varies depending on the composition of the film, but it is desirable to select the temperature of hot air from 50 ° C to 150 ° C for safety.

It is preferable that the hot air is blown over the entire period of the insulating coating removing work, but it is also effective if it is blown during a part of the working period. Further, if the blowing of the hot air is started before the scanning irradiation step of the pulsed laser beam LBQP and the covered wire winding portion 26 (28) is preheated,
The warm air effect can be further enhanced.

As described above, according to the insulating film removing method of this embodiment, the covered wire winding portion 26 (28)
On the other hand, the laser beams LBQP and LBCW may be emitted from one direction, the processing time is short, no manual work is required, and automation can be easily realized.

Next, an insulating film removing apparatus according to an embodiment of the present invention will be described.

FIG. 4 shows the appearance of the insulating film removing apparatus according to this embodiment. This insulating film removing device includes a control unit 40, a laser oscillation unit 42, a scanning unit 44, and a hot air supply unit 61.

In the control unit 40, a control display 48 is attached to the upper chamber 46, a control board is built in the intermediate chamber (back of the front door 50), and a lower chamber (front door 5).
A laser power supply circuit, a laser cooling device, and the like are built in (inside of 2). In the laser oscillating unit 42, a Q-switch type pulsed laser light LBQP and a continuous wave laser light LBCW, which will be described later, can be selectively output by switching.
An AG laser oscillator is provided. Inside the scanning unit 44, an optical scanning mechanism and a scanning driving unit, which will be described later, are provided. The hot air supply unit 61 is arranged beside the scanning unit 44, and the hot air discharge port of the nozzle 63 is directed to the processing position.

A workbench 54 is arranged below the scanning unit 44. Work (solenoid coil)
The sheet 10 is conveyed by a conveying device (not shown) and is aligned at a predetermined position on the work table 54 just below the scanning unit 44.

FIG. 5 shows the internal structure of the present insulating film removing apparatus. In this insulation film removing device,
Rod 60, excitation lamp 62, optical resonator mirrors 64, 6
6. The Q switch 68 constitutes a YAG laser oscillator. The power supply circuit 72, the control unit 74, the setting unit 76, the Q switch drive circuit 78, and the interface circuit 79 are provided in the control unit 40 and constitute a YAG laser power supply / control unit.

The hot air supply unit 61 has a blower 67, a heater 65 and a nozzle 63. The blower 67 generates an air flow, the heater 65 heats the air flow, and the high temperature air flow is turned into hot air from the nozzle 63. It is adapted to be sprayed onto the processed parts (26, 28) of the workpiece 10. The controller 74 controls the blower 67 and the heater 65 to control the volume and temperature of hot air.

In the present insulating film removing apparatus, when the YAG laser beam is oscillated and output, the power supply circuit 72 supplies a current to the excitation lamp 62 under the control of the control section 74, and the excitation lamp 62 continuously emits light. The YAG rod 60 receives continuous light from the excitation lamp 62 as excitation energy and continuously emits laser light in the axial direction from the rod end surface.

The control section 74 is composed of a microcomputer, operates according to predetermined software, and controls each section in the apparatus. As the Q switch 68, for example, an acousto-optic Q switch utilizing black diffraction by ultrasonic waves may be used.

Under the control of the control section 74, the Q switch drive circuit 78 supplies the high frequency electric signal ES modulated by the pulse-shaped modulation signal having a constant frequency to the Q switch 68, and as shown in FIG. , The peak output PM has a high Q at a repetition frequency (period TS) equal to the modulation frequency.
The switch pulse laser light LBQP is output from the output mirror 66 of the optical resonator. The repetition frequency (cycle TS) of the Q switch pulse laser light LBQP can be set to a desired value by the setting unit 76.

Under the control of the control section 74, when the operation of the Q switch drive circuit 78 is stopped and the high frequency electric signal ES is stopped, the Q switch drive circuit 78 is turned off, and the laser output Pm of the laser output Pm as shown in FIG. The continuous wave laser light LBCW is output from the output mirror 66 of the optical resonator. The laser output Pm of the continuous wave laser beam LBCW can be set to a desired value by the setting unit 76.

FIG. 6 shows a structural example of the optical scanning mechanism and the scanning drive section in the scanning unit 44. The optical scanning mechanism is composed of an X-axis rotary mirror 90 and a Y-axis rotary mirror 92 having mutually orthogonal rotary axes. The scanning drive unit includes an X-axis galvanometer scanner 94 and a Y-axis galvanometer scanner 96, which are connected to the rotation axes of the X-axis rotary mirror 90 and the Y-axis rotary mirror 92, respectively.

The parallel laser light LB (LBQP, LBCW) from the laser oscillating unit 42 first enters the X-axis rotating mirror 90, undergoes total reflection there, and then enters the Y-axis rotating mirror 92, and this mirror. After being totally reflected at 92, it is passed through the fθ lens 100 to be processed (solenoid coil 1
The processing point (0) (scan irradiation area 30 of the coated wire winding portions 26 and 28) is focused and irradiated. Scan irradiation area 30
The position of the upper laser spot is determined by the deflection angle of the X-axis rotating mirror 90 in the X direction and by the deflection angle of the Y-axis rotating mirror 92 in the Y direction.

The X-axis rotary mirror 90 is rotationally oscillated by the X-axis galvanometer scanner 94 in the directions of arrows A and A '. On the other hand, the Y-axis rotating mirror 92 is rotationally vibrated in the directions of arrows B and B ′ by the Y-axis galvanometer scanner 96. Both scanners 94 and 96 are supplied with X-direction and Y-direction scanning control signals from a control unit 74 in the control unit 40 via an interface circuit 79 and electric cables 106 and 108, respectively.

Therefore, each time the laser beam LB enters from the laser oscillation unit 42 into the scanning unit 44 at a predetermined timing, both scanners 94 and 96 respond to the X-direction and Y-direction scanning control signals in synchronization with it. By swinging the X-axis and Y-axis rotating mirrors 90 and 92 at predetermined angles, the beam spot of the laser beam LB is scanned within the laser beam irradiation region 30 of the workpiece 10.

When the insulating film removing apparatus of the above-mentioned embodiment is used, since it is possible to generate by switching between the Q-switch type pulse laser light LBQP and the continuous wave laser light LBCW with one laser device, the size and cost of the entire device can be reduced. , Has a great advantage in space, etc.
There is also an advantage that it can be operated continuously only by operating the switch. However, it goes without saying that the method for removing an insulating coating of a coated wire according to the present invention can be implemented by using two units, a pulse laser device and a continuous wave laser device.

The constructions of the work piece (solenoid coil) 10 and the covered wire winding portions 26, 28 in the above embodiments are merely examples, and the present invention is applicable to various shaped work pieces, various types of covered wire and It is applicable to various forms of covered wire winding parts.

[0520]

As described above, according to the method or apparatus for removing an insulating coating film of a coated wire according to the present invention, it is possible to efficiently remove the insulating coating film from the winding portion of the coated wire by the scanning irradiation of the laser beam. Yes, automation can be achieved and productivity and processing quality can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view for explaining a method of removing an insulating coating of a coated wire according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional side view for explaining a pulsed laser light irradiation step in the example.

FIG. 3 is a partial cross-sectional side view for explaining a continuous wave laser light irradiation step in an example.

FIG. 4 is a perspective view showing an external appearance of an insulating coating removing device according to an embodiment.

FIG. 5 is a block diagram showing a configuration of a main part of an insulating coating removing device in an example.

FIG. 6 is a perspective view showing an internal configuration of a scanning unit of the insulating coating removing apparatus of the embodiment.

FIG. 7 is a diagram showing a laser output waveform of Q-switch pulse laser light obtained by the insulating film removing apparatus of the example.

FIG. 8 is a diagram showing a laser output waveform of continuous wave laser light obtained by the insulating film removing apparatus of the embodiment.

FIG. 9 is a diagram showing a workpiece (solenoid coil) to be subjected to the insulating coating removal process in the example.

[Explanation of symbols]

 10 Workpiece (solenoid coil) 14 Coated wire 14a Conductor 14b Insulated film 22 Terminals 26, 28 Coated wire winding part 30 Laser light irradiation area 44 Scanning unit 60 YAG rod 61 Hot air supply unit 63 Nozzle 64, 66 Optical resonator mirror 68 Q switch 74 Control unit 78 Q switch drive circuit 90 X-axis rotary mirror 92 Y-axis rotary mirror 94 X-axis galvanometer scanner 96 Y-axis galvanometer scanner

Claims (5)

[Claims] 1. A method for removing an insulating coating of a coated wire, which comprises at least partially removing the insulating material from a wound portion of a coated wire formed by coating a conductor with an insulating material, wherein the insulating coating of the wound portion of the coated wire is removed. A pulsed laser light irradiation step of irradiating at least a part of the area to be scanned with the pulsed laser light in the XY direction, and at least a part of the area where the insulating coating is to be removed after the completion of the pulsed laser irradiation step. Continuous wave laser light to X
A continuous wave laser light irradiation step of scanning and irradiating in the Y direction. 2. The method for removing an insulating film from a covered wire according to claim 1, wherein the pulsed laser light is a Q-switched pulsed laser light oscillated and output by using a Q switch. 3. Heat for blowing hot air of a predetermined temperature onto at least a part of a region of the coated wire where the insulating coating is to be removed during a predetermined period including at least a part of an insulating film removal treatment period of the coated wire. The method for removing an insulating coating of a covered wire according to claim 1 or 2, comprising a wind blowing step. 4. An insulating film removing apparatus for a coated wire, which at least partially removes the insulating material from a wound portion of the coated wire, which is obtained by coating a conductor with an insulating material. Laser oscillating means for selectively outputting continuous wave laser light and selectively outputting laser light from the laser oscillating means, reflecting the laser light toward the covered wire winding portion side, and First scanning mirror means for scanning in a first direction at least a part of a region of the coated wire where the insulating coating is to be removed; and laser light from the first scanning mirror means is made incident on the laser beam. Light is reflected toward at least a part of a region of the coated wire where the insulating coating is to be removed, and the first direction is at least part of the region of the coated wire where the insulating coating is to be removed. And a second scanning mirror means for scanning in a second direction orthogonal to the above. 5. The insulation coating removal of the coated wire according to claim 4, further comprising hot air supply means for blowing hot air of a predetermined temperature to at least a part of a region where the insulation coating of the coated wire is to be removed. apparatus.