JP2022151356A - Coating removal method from hollow coated stranded wire, and hollow coated stranded wire stripping device - Google Patents

Abstract

To provide a coating removal method from hollow-coated stranded wire capable of stably removing the coating from a hollow-coated stranded wire while suppressing residue on the conductor surface exposed from the hollow-coated stranded wire, and a hollow-coated stranded wire stripping device.SOLUTION: The coating removal method from a hollow-coated stranded wire in which a stranded wire is a conductor coated with an outer sheath that is a conductor and the outer sheath that is an insulator is wrapped around the stranded wire, includes: a cutting process in which a laser beam is used to cut the outer sheath, which is the insulator, of the hollow-coated stranded wire, and a cut is made in the outer sheath, which is the conductor, wrapped around the conductor wire; and a coating removal step of removing the outer sheath that is the insulator and the outer sheath that is the conductor by moving in a direction away from the hollow-coated stranded wire with the cut as a boundary.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present invention relates to a method for stripping a coated hollow stranded wire and an apparatus for stripping the coated hollow stranded wire, which are used, for example, in pressure-sensitive sensor cables and the like.

2. Description of the Related Art A pressure sensor is sometimes used for an electric sliding door or an electric back door of an automobile as means for detecting pinching of limbs or the like. Hollow coated stranded wires are mainly used for this pressure sensor in many cases.

The hollow sheathed stranded wire described above has multiple conductors arranged in a spiral and spaced manner within a hollow sheath such that when the hollow sheath collapses due to excessive pressure, the spaced apart conductors come into contact with each other. there is
By electrically detecting this contact, pinching of hands and feet can be detected.

When electrically connecting the hollow coated stranded wires described above, an electrical circuit is formed by peeling off the coating of the hollow coated stranded wires to expose the conductors and joining them to a substrate or the like to which the wire harness is connected. It may be used as a pressure sensor.

Here, as a method for stripping the covering that constitutes the covered hollow stranded wire, for example, as disclosed in Patent Document 1, mechanical removal using a circular blade or the like is conceivable.

In addition, as shown in Patent Document 2, removal of the coating by irradiation with laser light is conceivable.

JP 2007-166871 A JP 2004-096991 A

However, in the mechanical removal method as in Patent Document 1, when the blade is pressed against the hollow covered stranded wire, the hollow space is crushed and deformed. There was a problem that the coating could not be completely cut off.
In addition, in the removal method using laser irradiation as in Patent Document 2, the insulation coating scatters on the exposed conductor surface during the coating removal process, and the insulation coating adheres as a residue, and the conductor in that state is removed. However, there is a problem that electrical characteristics are affected when welding to a substrate or the like.

Accordingly, the present invention provides a coated hollow stranded wire coating removal method and a hollow coated stranded wire coating removal apparatus capable of stably removing the coating of the hollow coated stranded wire and suppressing residue on the conductor surface exposed from the hollow coated stranded wire. I will provide a.

The present invention relates to a method for removing coating from a hollow coated stranded wire in which a conducting wire coated with an outer skin that is a conductor is used as a stranded wire, and the stranded wire is coated with an outer skin that is an insulator, using a laser beam, a cutting step of cutting the insulating sheath of the hollow coated stranded wire and cutting the conductor sheath covering the conductor; and a coating removing step of moving away from the covered hollow stranded wire at the incision to remove the coated hollow stranded wire.

Moreover, in the coating removing method of the present invention, it is preferable that the laser beam is a laser beam oscillated from a carbon dioxide laser.

The present invention relates to a coated hollow stranded wire coating removal apparatus for removing the coating of a hollow covered stranded wire in which a conductive wire coated with an outer skin of a conductor is stranded, and the stranded wire is coated with an insulating outer coating around the stranded wire, A laser oscillator, a clamp for fixing the covered hollow stranded wire, an optical system for irradiating the hollow covered stranded wire with a laser beam oscillated from the laser oscillator, an outer sheath that is an insulator, and a conductor that covers the a coating separation jig for removing the outer skin of the conductor, a nozzle for spraying inert gas onto the hollow coated stranded wire, and a dust collection nozzle for collecting floating matter generated from the hollow coated stranded wire. It is a device for removing coating from a hollow covered strand characterized by the following.

In the coated hollow stranded wire coating removing apparatus of the present invention, it is preferable that the clamp includes a fixing jig for fixing the hollow covered stranded wire and a rotating electric motor for rotating the fixing jig.

In the device for removing coating from hollow coated strands of the present invention, it is preferable that the laser oscillator is a carbon dioxide laser.

According to the present invention, a coated hollow stranded wire that can stably remove the coating of the hollow coated stranded wire and suppress the adhesion of residue of the insulating coating to the conductor surface exposed from the hollow coated stranded wire is provided. can be removed.

It is a mimetic diagram showing an example of a covered wire used for an embodiment of the present invention. 1 is a schematic diagram showing an example of a hollow covered stranded wire used in an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a conceptual diagram for explaining a hollow coated strand wire coating removing device according to a first embodiment of the present invention; FIG. 2 is a flow diagram of a hollow covered strand wire covering removal method in an embodiment of the present invention. It is a conceptual diagram explaining the cutting process in embodiment of this invention. It is a conceptual diagram explaining the coating removal process in embodiment of this invention. It is a conceptual diagram explaining the optical system used for 2nd Embodiment of this invention. It is a conceptual diagram explaining the clamp used for 3rd Embodiment of this invention.

Hereinafter, a method for manufacturing a covered hollow stranded wire and an apparatus for removing coating of a covered hollow stranded wire showing one embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the hollow coated stranded wire used in this embodiment is formed by spirally winding the electrode wire 1 and the side spacer 2 around the central spacer 3 to form a stranded wire. By preparing a covered wire 10 coated with an outer sheath (hereinafter abbreviated as an insulating coating 4) that is an insulator so as to enclose it, and pulling out the side spacers 2 and the center spacer 3 from the covered wire 10, A hollow covered stranded wire 11 as shown in FIG. 2 is produced.
Here, the electrode wire 1 is provided with an outer covering (hereinafter abbreviated as a conductive coating 6) that is a conductor around a conductor wire 5 that is a metal wire. Electrical continuity is provided between the lines 1 . As a material of the conductive coating 6, there is, for example, a material obtained by adding carbon to a thermoplastic elastomer as an insulator, and the carbon provides conductivity.

(Configuration of the first embodiment)
First, an apparatus 20 for removing coating of hollow covered strands according to a first embodiment of the present invention will be described. As shown in FIG. 3, the device 20 for removing the coating of the hollow coated strand wire includes a clamp 39, a laser oscillator (not shown) for oscillating the laser light L, an optical system (hereinafter referred to as a mirror 32), and a hollow A dust collecting nozzle 38 installed from the upper part of the covered strand 11 toward the hollow covered strand, a nozzle 37 positioned below the mirror 32 and arranged facing the hollow covered strand 11, and the insulating coating 4. A coating separation jig (not shown) is provided for separating and removing the conductive coating 6 from the hollow coated stranded wire.

The mirror 32 reflects the laser beam L emitted from the laser oscillator and irradiates it onto the covered hollow stranded wire 11 . The mirror 32 is preferably made of a material having a high reflectance with respect to the wavelength of the laser light L. As shown in FIG. For example, in this embodiment, the mirror 32 uses a copper plate. Moreover, it is preferable that the mirror 32 has a mechanism for adjusting the processing position of the hollow coated stranded wire 11 and the focal length of the laser beam L. As shown in FIG. For example, mirror 32 was connected to stage 33 in this embodiment.

Here, it is preferable to install a plurality of mirrors 32 in order to uniformly process the entire circumference of the covered hollow stranded wire 11 . In the present embodiment, FIG. 3 shows a state in which two mirrors 32 are installed facing the outer periphery of the hollow covered stranded wire 11. However, by increasing the number of mirrors 32, uniform processing in the circumferential direction can be achieved. It is possible to improve the performance.

The wavelength of the laser light L oscillated from a laser oscillator (not shown) is preferably in a band in which the coating has a high absorption rate. In particular, it is preferable to use a carbon dioxide laser, an ultraviolet (UV) laser, or an ultrashort pulse laser as the laser oscillator. In this embodiment, a carbon dioxide laser with a wavelength of 10.6 μm is used.

A clamp 39 is used to fix the hollow sheathed stranded wire 11 . As will be described later, the clamp 39 may be rotated in order to uniformly process the entire circumference of the covered hollow stranded wire 11 .

The nozzle 37 is installed to avoid carbonization of the insulating coating 4 and the conductive coating 6, which may occur depending on the irradiation conditions when the insulating coating 4 and the conductive coating 6 are irradiated with the laser beam L. In particular, it is preferable to spray an inert gas during laser processing. For example, nitrogen gas was used in this embodiment.

The dust collection nozzle 38 is used to suck and remove fumes (floating matter) generated when the insulating coating 4 and the conductive coating 6 are irradiated with the laser beam L. As shown in FIG. By recovering the fumes, it is possible to prevent the fumes from adhering to the optical lens and mirror 32 attached to the laser oscillator, thereby avoiding deterioration in optical characteristics and processing capability.

A coating separation jig (hereinafter referred to as strip claw 36), not shown in FIG. It is used to move away (in the direction of the dust collection nozzle 38) to separate the insulating coating 4 and the conductive coating 6 from the hollow coated stranded wire.

Next, referring to the flow chart in FIG. 4, a description will be given of a covered hollow twisted wire coating removal method in the hollow covered twisted wire coating removing apparatus 20 of the present embodiment.

(preparation)
First, the covered hollow stranded wire 11 is fixed to the clamp 39 so that a predetermined position of the hollow covered stranded wire 11 is irradiated with the laser beam L. As shown in FIG. Here, after fixing the covered hollow stranded wire 11 to the clamp 39 , the mirror 32 may be positioned so that a predetermined position of the hollow covered stranded wire 11 is irradiated with the laser light L.

(Incision process)
First, the hollow coated twisted wire 11 is irradiated with the laser beam L from the state shown in FIG. As shown in FIG. 5(a1), the insulating coating 4 is melted and can be completely removed. Here, FIG. 5(a2) is a schematic cross-sectional view of the portion irradiated with the laser beam L, and the slit SL shown in FIG. It is shown schematically.

Next, as shown in FIG. 5( b 1 ), the irradiation conditions of the laser beam L are set so that the cutting depth does not expose the conductor 5 from the conductive coating 6 , and the laser beam L is irradiated onto the hollow coated stranded wire 11 . do.
That is, the irradiation conditions of the laser light L are set so that the irradiation of the laser light L ends at the position of the slit SL shown in FIG. 5(b2). By setting the irradiation conditions in this way, the insulating coating (outer skin that is an insulator) can be cut and the conductive coating (outer skin that is a conductor) can be cut using a laser beam. As shown in (c), the residue 7 of the insulating coating 4 and the conductive coating 6 on the optical path of the laser light L melted and scattered by the irradiation of the laser light L only scatters and adheres to the conductive coating 6. It will be.

(Coating removal step)
Next, as shown in FIG. 6(a), the strip claw 36 is sandwiched between the cuts (slits SL) thus generated, and the strip claw 36 is moved away from the covered hollow strand 11 (in the direction indicated by the arrow in the figure). By moving, the conductive coating 6 is torn starting from the slit SL and separated from the hollow coated strand 11 . Furthermore, as shown in FIG. 6(b), by continuing to move the strip claw 36, the insulating coating 4 and the conductive coating 6 are removed by moving away from the hollow coated stranded wire at the boundary of the cut, thereby removing the conductive wire. 5 can be exposed.

In addition, when the cutting depth of the conductive coating 6 is shallow, the adhesive force between the conductive coating 6 and the insulating coating 4 is smaller than the force required to tear from the cut starting point, so the conductive coating 6 is torn. It peels off from the insulating coating 4 before. Therefore, the depth of the slit SL must be such that the conductor 5 is not exposed and the conductive coating 6 can be torn off with a force that does not separate the conductive coating 6 from the insulating coating 4. For example, in this embodiment, the thickness of the conductive coating 6 is 0.425 mm, and the cutting depth is 0.250 mm.

Further, in order to reduce the mechanical strength of the conductive coating 6, the coating may be removed while heating the hollow coated stranded wire 11 or heating the strip claw 36. FIG. By doing so, the conductive coating 6 is softened and can be easily torn.

(Second embodiment)
A second embodiment of the present invention, which is an apparatus for removing coating from hollow coated strands, will be described. The structure of the device for removing the sheath of the hollow covered strands of this embodiment differs from the structure of the device for removing the sheath of the hollow covered strands 20 of the first embodiment only in the mirror. Here, the same configurations as those of the apparatus 20 for removing coated hollow stranded wire of the first embodiment have the same effects, so the same symbols are attached and the description thereof is omitted.

The apparatus for removing coating of hollow coated strands of the present embodiment uses a conical mirror 34 having a conical reflection surface for laser light L, as shown in FIG. 7, instead of a mirror. By scanning the surface of the conical mirror 34 with the laser light L at the same height, the outer peripheral surface of the hollow covered stranded wire 11 can be processed with the laser light L at the same focal length, resulting in more uniform processing. can be realized. Also, the conical mirror 34 may be divided and treated as a plurality of mirrors.

(Third Embodiment)
A third embodiment of the present invention, which is a device for removing coating from hollow covered strands, will be described. The structure of the device for removing the sheath of the hollow covered stranded wire of this embodiment differs from the structure of the device for removing the sheath of the hollow covered stranded wire 20 of the first embodiment only in the clamp. Here, the same configurations as those of the apparatus 20 for removing coated hollow stranded wire of the first embodiment have the same effects, so the same symbols are attached and the description thereof is omitted.

8, instead of the clamp 39, the apparatus for removing the covering of the hollow covered stranded wire of the embodiment includes a fixing jig 31 and a fixing jig 31 for rotating the fixing jig 31 around the central axis of the covered hollow stranded wire 11, as shown in FIG. A clamp 40 consisting of a rotary electric motor (rotary actuator 35) is used.

In the coated hollow stranded wire coating removing apparatus of the present embodiment, by rotating the rotary actuator 35 in synchronization with the oscillation of the laser beam L, the entire circumference of the covered hollow stranded wire 11 can be processed uniformly. By doing so, the device configuration can be simplified.

As described above, according to the present embodiment, the laser irradiation conditions are set such that the cutting depth does not expose the conductive wire from the conductive coating of the hollow coated stranded wire, and the slit is formed in the conductive coating. The coating is peeled off. By doing so, it is possible to suppress the residue of the insulating coating from adhering to the conductor surface exposed from the covered hollow stranded wire when removing the covering from the covered hollow stranded wire.

Furthermore, according to the present embodiment, since the covered hollow stranded wire can be processed without contact, it is possible to suppress the influence of the deformation of the hollow space on the depth of cut. Further, if the cross-sectional shape of the hollow coated stranded wire is symmetrical about the central axis, it becomes possible to process the entire circumference without specifying the phase of the conducting wire by an image processing device or the like.

Moreover, according to the present embodiment, it is not necessary to develop highly accurate laser control that stops laser irradiation before residue adheres to the conducting wire. Furthermore, since only one laser is used, it is possible to avoid the increase in apparatus cost and the alignment problem of the processing position with other lasers that occur in the case of two-stage processing using other lasers.

In addition, since it is not necessary to remove the residue using a chemical method after removing the coating, it is possible to avoid an increase in manufacturing cost due to an increase in the number of man-hours and a safety and health problem.

Although the method for removing coating from a covered hollow stranded wire and the apparatus for removing coating from a covered hollow stranded wire according to the present invention have been described above using the embodiments, the present invention is not limited to the above-described embodiments.
The contents can be changed within the technical scope described in the claims.

1: Electrode wire 2: Side spacer 3: Center spacer 4: Insulating coating 5: Lead wire 6: Conductive coating 7: Residue 10: Covered wire 11: Hollow covered twisted wire 20: Hollow covered twisted wire Cover removal device 31: Fixing jig 32: Mirror 33: Stage 34: Conical Mirror 35: Rotary Actuator 36: Strip Claw 37: Nozzle 38: Dust Collection Nozzle 39, 40: Clamp

Claims (5)

In a method for removing coating from a hollow covered stranded wire in which a conductive wire coated with an outer sheath that is a conductor is stranded, and the stranded wire is covered with an outer sheath that is an insulator,
a cutting step of using a laser beam to cut the outer sheath that is the insulator of the hollow coated stranded wire and cutting the outer sheath that is the conductor covering the conductor wire; and the outer sheath that is the insulator and the conductor. and a covering removing step of moving the outer covering in a direction away from the covered hollow stranded wire with the cut as a boundary to remove the covered hollow stranded wire. 2. The method for removing coating from a hollow covered stranded wire according to claim 1, wherein said laser beam is a laser beam oscillated from a carbon dioxide laser. A device for removing the coating of a hollow covered stranded wire in which a conductive wire coated with an outer skin of a conductor is used as a stranded wire, and the stranded wire is covered with an insulating outer coating around the stranded wire,
a laser oscillator;
a clamp that secures the hollow covered stranded wire;
an optical system for irradiating the hollow coated stranded wire with a laser beam oscillated from the laser oscillator; and a coating separation jig for removing the outer coating, which is an insulator, and the outer coating, which is a conductor covering the lead wire. ,
a nozzle for spraying an inert gas onto the hollow covered stranded wire;
a dust collection nozzle that collects floating matter generated from the hollow covered stranded wire;
A device for stripping a hollow coated strand wire, characterized by comprising: 4. The apparatus for stripping the covered hollow strand wire according to claim 3, wherein the clamp comprises a fixture for fixing the hollow covered strand and a rotary motor for rotating the fixture. 5. The apparatus for stripping coating of a hollow coated strand wire according to claim 3, wherein said laser oscillator is a carbon dioxide laser.

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