JPH0217813A - Stripping method for wire coating - Google Patents

Abstract

PURPOSE:To remove only a coating of an irradiated section by irradiation with a CO2 laser adjusted in a beam shape to a coated wire so that a required part of the coating can be removed and vaporizing and melting the coating of the irradiated section to remove. CONSTITUTION:A CO2 laser beam 51 taken out of a laser oscillator 50 is such that beam sizes in a longitudinal and lateral direction can be adjusted independently by moving each of cylindrical lenses 10 and 11 in the direction of an optical axis by using the two lenses. The beam size is optionally adjusted according to a kind of a wire 1 as an object and an exfoliating shape to be required, and the beam is directed to the coated wire 1 held with a wire clamper 15, so that the coating is stripped off by non-contact without giving any external force to a conductor of the wire 1. According to the constitution, the coating of the irradiated section can be only removed with keeping a high quality without giving any damage to the conductor or making any deformation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for stripping a wire coating suitable for stripping a thin wire coating that is difficult to strip by, for example, a method of applying mechanical stress. It is.

[Conventional technology]

FIGS. 5(a), 5(b), and 5(c) show conventional computers and OA equipment, respectively, as disclosed in, for example, Japanese Patent Application Laid-Open No. 59-25509.

FIG. 1 is a configuration diagram sequentially illustrating a method of stripping an insulation coating of a flat cable used as a signal line for AV equipment or the like. In the figure, (υ is a coated wire (flat cable), +21 is a conductor, and ta is a wire fixing jig.

(411 is a clamper, +421 is a cylinder for the clamper, (0 is a cylinder for coating removal, +441h is a clamper fixing jig, Shin is a laser beam generator, and 511 is a laser beam.

Next, the operation will be explained. First, the coated electric wire (flat cable) (1) is fixed in a predetermined position with a wire fixing jig decoy, and the insulation coating is applied to one side or both sides with the laser beam 1511 emitted from the laser beam generator ■. Partially removed.

(Figure 1a). Next, the coated electric wire (flat cable) pile is transported by an electric wire fixing jig to a predetermined position where a clamper is waiting. The clamper tnnFi clamper cylinder (rotation) clamps the coated wire (flat cable) tile with a predetermined pressure.
Figure b), by moving the clamper fixing jig in the direction of the arrow in the figure using the coating stripping cylinder, the conductor (2) whose insulation coating is stripped is exposed (Figure 1C)
That is what it is.

[Problem to be solved by the invention]

Conventional wire coating stripping methods are structured as described above, so when it comes to small-diameter wires that are being used these days, the problem is that the applied force can cause the conductor to break or the pitch between the conductors to shift. was there.

The present invention was made to solve the above-mentioned problems, and an object thereof is to provide a method for stripping a wire coating without damaging or deforming the conductor.

[Means to solve the problem]

The wire coating stripping method of the present invention uses a CO
The coating on the irradiated area is removed by evaporation or melting by irradiating the laser beam.

[Function] The wire coating stripping method in this invention utilizes the difference in absorption characteristics depending on the laser material, and adjusts the COt laser beam to an arbitrary size as necessary and irradiates the coated wire. Only the covering of the irradiated area can be removed without damaging or deforming the conductor.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing the basic structure of a wire sheath stripping device according to an embodiment of the present invention.
Each is an explanatory diagram showing an example of a change in the shape of a laser beam for explaining the operation of the optical system using a cylindrical lens in FIG. C) represents the beam size of the laser beam. FIG. 3 is a schematic perspective view showing a flat cable as an example of a covered electric wire to which the present invention is applied, and FIG. 4 is a schematic perspective view showing an electric wire (the flat cable in FIG. 3) from which the coating has been peeled off according to this embodiment. It is. In the figure, (
1) is a coated wire (flat cable), f21 is a conductor, QOI, (Ill is a cylindrical lens, (1)
2) is a lens moving mechanism, 151 is a wire clamper, ■ is a CO2 laser oscillator, and 611 is a CO□ laser beam.

As shown in FIG. 3, the target electric wire is, for example.

It is like a flat cable with a conductor diameter of 90 μm, a coated wire diameter of Q, 4 m, 20 cores, and 8 wires in width. There are conductors with diameters as large as 300 to 400 μm, and those with even smaller conductors, and those with many or few cores (the standard is 20 to 30), and the diameter and width of the covered wire also vary. The size of the part that requires stripping differs depending on the type of wire.

In order to strip the coatings of these various types of electric wires (1) to the required size, a laser oscillator ω is used as shown in Figure 1.
By using two cylindrical lenses 011 and moving each lens in the optical axis direction, the C02 laser beam #51J taken out from the can be adjusted to. Adjust as desired depending on the type of the target wire (1) and the required peeling shape, and then apply it to the wire clamper Q.
By irradiating the coated wire held at 51, the wire is peeled off in a non-contact manner without applying any external force to the conductor of the wire.

Adjustment of the shape of the CO2 laser beam (51) will be explained based on FIG. 2. In the wire coating stripping device according to the present invention, the CO laser oscillator has a short width (1 to 2 μ!ec) and a large peak output (approximately 5 MW).
) TEA (Transve
rrsely Excited Atomosheri
c pressure)-C02 laser was used. The size of the laser beam is 20W x 3011II at the oscillator exit.
The divergence angle of the beam is approximately 4 mrad, and the distance from the oscillator exit to the wire is approximately 1.5 m. Cylindrical lenses with focal lengths of 10 inches (254M) and 30 inches (762M) are used, and the 30-inch lens adjusts the horizontal direction, and the 10-inch lens adjusts the vertical direction. As the distance between the lens and the wire increases, the size of the laser beam irradiated to the wire becomes smaller both vertically and horizontally.

In this way, the wire is irradiated with the beam adjusted to the desired beam size depending on the wire to be processed, so that the irradiated area can be coated without damaging or deforming the conductor, as shown in Figure 4. can be removed with high quality.

Good results have been obtained by conducting soldering and dielectric strength tests on the wires after the coating has been stripped.

In the above embodiment, TEA-CO is used as the laser oscillator.
, a case where a laser is used is shown, but other lasers may be used. The beam mode may be any mode such as a single mode, but a multi-mode is preferable.

Further, in the above embodiment, two cylindrical lenses are used to independently adjust the vertical and horizontal directions.

Even if one cylindrical lens and a spherical lens are combined, and the cylindrical lens is used to adjust only one direction independently to adjust the aspect ratio and the spherical lens is used to adjust the size, the same effect as in the above embodiment can be obtained. . moreover,
It goes without saying that a cylindrical mirror or a spherical mirror may be used in place of the lens.

Furthermore, although the workability is inferior, it goes without saying that the same effect can be obtained by moving the CO or laser beam relative to the coated wire and removing the coating of the desired portion only with the laser.

〔Effect of the invention〕

As described above, according to the present invention, a CO2 laser whose beam shape is adjusted so as to remove a desired portion of the coating on a covered wire is irradiated, and the coating on the irradiated portion is evaporated or melted and removed. So.

This has the effect of removing only the covering of the irradiated area without damaging or deforming the conductor.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing a wire coating stripping device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the operation of the optical system in Fig. 1, and Fig. 3 is a diagram illustrating the operation of the optical system in Fig. 1. The schematic perspective view which shows an example of an electric wire. FIG. 4 is a schematic perspective view showing the electric wire after the coating has been peeled off. FIGS. 5(a), 5(b), and 5(C) are block diagrams sequentially illustrating a conventional method for removing a wire coating. In the figure, (1) is a covered electric wire (flat cable). (2) is a conductor, GO+, (111 is a cylindrical lens, α2 is a lens moving mechanism, (151 is an electric wire clamper, (51m is a CO2 laser oscillator, and 61) is a CO□ laser beam. Note that the same symbols in Figure 9 are the same or A considerable portion is shown.

Claims (1)

[Claims] A method for stripping a wire coating by irradiating a coated wire with a CO_2 laser whose beam shape is adjusted so as to remove the coating from a desired portion, and removing the coating by evaporating or melting the irradiated portion.