JPS644405B2 - - Google Patents

Description

[Detailed Description of the Invention] In order to electrically connect an insulated wire, it is necessary to peel off the insulating coating layer, and in the conventional method of cutting the coating layer with a cutting blade and peeling it off, the core wire There was a risk that the strands of the core wire would be cut by the cutting blade biting into the surface, or even in the case of a single core wire, it would break due to bending fatigue from the cuts made by the blade.

Furthermore, if the core wire is an ultra-fine wire, there is a risk that the core wire will be torn off along with the covering layer when cutting into or peeling off the covering layer. As a means of solving this problem, there is a method of melting or burning out the coating layer using heat or flame, but there are problems such as difficulty in operation and deterioration of the product, and no suitable method has yet been found. The present application is intended to solve such drawbacks, and the reflectance of the core wire of the laser beam on the metal surface is lower than that of plastics such as vinyl chloride, rubber or organic enamel that forms the insulation coating layer, or ceramics used in fire-resistant electric wires. This method streamlines the work of stripping insulated wires by taking advantage of the fact that it is much higher than the previous method and that no chips are generated.

First, the first embodiment of the present application will be explained with reference to FIG. Figure 1 schematically shows a cross section of an insulated wire to be stripped, and is generally applied to the outer periphery of a core wire 1 consisting of a single wire of metal wire such as copper or aluminum, or a twisted wire made by twisting strands of metal wire. It shows insulated wires 3 coated with an insulating coating layer 2 of vinyl chloride used in an extruder and arranged in parallel in a direction perpendicular to the plane of the paper.

A CO ₂ gas laser with an output of 250 W is suitable as the laser source 4, and the irradiation direction of the laser beam is sequentially scanned in the direction shown by the dotted line.
In the scanning range 5, the beam passes through the transparent window 7 and burns and cuts the coating layer 2 in a width of 0.5 mm, but the shadow portion 8 of the core wire 1 remains unburned. However, the beam in the scanning range 6 also passes through the transparent window 7 and is reflected by the reflecting mirror 10 provided on the other side of the duct 9, after which the coating layer 2 remaining in the shadow area 8 is cut in the same way.

Further, from the left side of the duct 9, a suction pump or the like is used to release chlorine gas generated when vinyl chloride is burned and decomposed. Although FIG. 1 shows the case where a cut surface is formed on the coating layer 2, the insulated wire 3 is run in a direction perpendicular to the plane of the paper, and the irradiation is intermittently performed at predetermined time intervals while the wire is running, so that the desired wire axial length is obtained. It is possible to peel off the coating layer within the range of . FIG. 2 is a sketch showing where the electric wire 3 whose coating layer 2 is processed to have a cut surface 11 or an intermediate peeled portion 12 by the above-mentioned method is sent in the direction of the arrow to the next core wire cutting step, Although the electric wire 3 fed by the guide roller 13 from the above-mentioned laser cutting device represented by the laser source 4 is converted into intermittent feed by a slackening device or the like, it is cut into two cut surfaces 11 by the core wire cutter 14. , 11, the core wire is cut approximately at the center. At this time, although the coating layer 2 remaining on the cut surface 11 adjacent to the core wire cutting part is not shown, it is possible to simultaneously perform the stripping work on both ends of the wire, which has been removed by the coating layer gripper and the core wire has been cut. It is. However, in order to prevent the cut ends of the twisted core wires from coming apart, it is also preferable to leave them until the next step, for example, when connecting terminals are crimped onto the core wires. Similarly, by performing the core wire cutting process also at the location indicated by the dotted line 15, it is possible to sequentially and automatically manufacture electric wires with intermediate skin peeling. In the method shown in FIG. 1, the coating layer in the shadow area 8 is removed by the laser beam reflected by the reflecting mirror 10, but it is of course possible to guide the laser beam from the same laser source using a well-known optical fiber. Since the remaining portion of the shadow portion is smaller than the portion directly irradiated with the beam, the induced loss due to the optical fiber does not pose a problem.

In addition, the laser beam can be brought into the narrow area around the core wire cutting machine by using an optical fiber to guide the beam to the area equivalent to the direct irradiation area, in the same way as guiding it to the shadow area. ,
It becomes possible to easily cut and strip electric wires.

In addition, unlike the case where electric wires are manufactured continuously as shown in Figure 2, in extreme cases such as wire harnesses, even after they are assembled into a wire bundle or after connecting terminals or connectors to both ends, intermediate manufacturing is performed as appropriate. It can be applied to stripping work of parts, has an extremely wide range of applications, and has great potential to contribute to electric wire connection technology.

[Brief explanation of the drawing]

The figures are for explaining the embodiment of the present application, and FIG. 1 is a diagram schematically showing a sectional view in the cross-sectional direction of the electric wire;
FIG. 2 shows an explanatory diagram illustrating a process in which the method of the present application is connected to a wire core cutting device. The reference numeral 3 indicates an electric wire, 4 indicates a laser source, and 14 indicates a core wire cutter.

Claims (1)

[Claims] 1. A laser beam is irradiated from the side of the insulated wire, and a beam from the same laser source is reflected or bent and irradiated onto the insulating coating layer in the shaded area of the metal core wire to irradiate a part of the insulating coating layer. A method for stripping an insulation coating layer, which comprises cutting or burning away the insulation coating layer. 2. The method for stripping an insulated wire according to item 1, characterized in that the laser beam is guided to the stripping location of the wire using an optical fiber. 3. The method for stripping an insulated electric wire according to item 1 or 2, characterized in that a duct having a transparent window surrounding the beam irradiation area is provided to exhaust gas generated by cutting or burning out the insulation coating layer. . 4. The method for stripping an insulated wire according to item 1, 2, or 3, which comprises burning out the insulation coating layer in the intermediate portion of the insulated wire.