JP2010253492A - Laser beam welding apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rapidly and easily execute the cover removing work of a covered conductor and the laser beam welding work of the covered conductor and a terminal. <P>SOLUTION: A laser beam welding apparatus executes the laser beam welding of a covered conductor 10 and a terminal 14 which are held in a contact state. The laser beam welding apparatus 20 comprises: a laser beam apparatus 22 for generating laser beam L; an application position changing mechanism unit 30 for changing the application position of the laser beam L; and a welding control unit 40 for controlling the application position changing mechanism unit 30 so that the covered conductor 10 and the terminal 14 are subjected to the laser beam welding by applying the laser beam L from the laser beam apparatus 22 to a spot for welding between the covered conductor 10 and the terminal 14, after removing the cover on a surface of the area to be welded by applying the laser beam L from the laser beam apparatus 22 to the surface of the area to be welded of the covered conductor 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for laser welding a coated conductor and a terminal.

  For electrical circuit parts such as automotive wire harnesses, electrical junction boxes (J / B (junction box), R / B (relay box), F / B (fuse box)), etc. Are appropriately connected to form a predetermined electric circuit.

  The coated conductor and the terminal can be connected by laser welding without removing the coating of the coated conductor. However, if the coated conductor and the terminal are laser welded without removing the coating, the quality deteriorates due to the carbonized coating remaining (contact failure, insufficient connection strength), the appearance deteriorates due to adhesion of flaws and the remaining molten coating. Etc. are concerned. In order to suppress these, it is preferable to remove the coating in advance when connecting the coated conductor and the terminal.

  Here, as one method for removing the coating of the coated conductor, there is a mechanical coating removal method by cutting or the like.

  However, in the mechanical removal method, there is a risk that the conductor wire may be scratched and the properties of the conductor wire may be deteriorated, and the coating removal processing for the extra fine wire (for example, enameled wire having a diameter of 0.1 mm or less) There is a problem that it is difficult.

  Therefore, as disclosed in Patent Document 1, various coating removal methods using laser light have been developed.

JP 2007-68343 A

  However, conventionally, the coating removal operation with laser light has been performed as a pre-process for connecting the coated conductor with a dedicated laser peeling machine. For this reason, even when laser welding the coated conductor and terminal, the coating removal work using the laser device for surface processing and the laser welding connection between the coated conductor and terminal using the laser device for welding are performed. Therefore, it is necessary to perform them separately, and the connection work between the coated conductor and the terminal is complicated.

  Then, an object of this invention is to enable it to perform the coating removal operation | work of a covered conducting wire, and the laser welding operation | work of the covered conducting wire and a terminal quickly and easily.

  A laser welding apparatus according to a first aspect is a laser welding apparatus for laser welding a coated conductor and a terminal held in contact with each other, the laser apparatus capable of generating laser light, the coated conductor, An irradiation position changing mechanism for changing the irradiation position of the laser beam from the laser device to the terminal, and the welding target region by irradiating the surface of the welding target region of the coated conductor with the laser beam from the laser device After removing the surface coating, the irradiation position is such that the laser beam from the laser device is irradiated onto the spot to be welded between the coated conductor and the terminal to laser weld the coated conductor and the terminal. And a welding control unit that controls the change mechanism unit.

  The laser welding apparatus according to the second aspect is the laser welding apparatus according to the first aspect, wherein the welding control unit applies the laser light from the laser device to the surface of the welding target region of the coated conductor multiple times. The irradiation position changing mechanism is controlled so as to remove the coating on the surface of the welding target area by irradiating while moving.

  According to the laser welding apparatus according to the first aspect, after irradiating the surface of the welding target region of the coated conductor with the laser beam from the laser device to remove the coating on the surface of the welding target region, from the laser device In order to laser-weld the coated conductor and the terminal by irradiating the spot to be welded between the coated conductor and the terminal with laser light, the coating removal operation of the coated conductor, and the coated conductor and the terminal Laser welding work can be done quickly and easily.

  According to the laser welding apparatus according to the second aspect, at the time of coating removal, a laser beam for welding is used to irradiate the laser beam from the laser apparatus while moving the laser beam to the surface to be welded of the coated conductor multiple times. Even in such a case, the covering of the covered conductor can be removed more appropriately.

It is the schematic which shows the laser welding apparatus which concerns on embodiment. It is a block diagram which shows a welding control unit. It is a flowchart which shows the process of a welding control unit. It is explanatory drawing which shows the coating | coated removal operation by a laser welding apparatus. It is explanatory drawing which shows the conducting wire with a coating in the middle of coating removal. It is explanatory drawing which shows the laser welding operation | movement by a laser welding apparatus. It is explanatory drawing which shows the conductor with a coating | coated in a laser welding, and a terminal. It is explanatory drawing which shows the state irradiated, moving the laser beam to the welding object area | region surface only the one way along the longitudinal direction. It is explanatory drawing which shows the state irradiated, moving the laser beam to the welding object area | region surface only the one way along the longitudinal direction. It is explanatory drawing which shows the state irradiated, moving the laser beam to the welding object area | region surface only the one way along the longitudinal direction. It is explanatory drawing which shows the state irradiated, moving the laser beam to the welding object area | region surface only the one way along the longitudinal direction. It is explanatory drawing which shows the state irradiated while moving the laser beam to the surface of a welding object area | region several times along the longitudinal direction. It is explanatory drawing which shows the state irradiated while moving the laser beam to the surface of a welding object area | region several times along the longitudinal direction.

  Hereinafter, the laser welding apparatus according to the embodiment will be described. FIG. 1 is a schematic view showing a laser welding apparatus 20.

  The laser welding apparatus 20 is an apparatus for connecting the coated conductive wire 10 and the terminal 14 by laser welding after removing the coating of the coated conductive wire 10, and includes a laser device 22, an irradiation position changing mechanism unit 30, and the like. The welding control unit 40 is provided.

  Here, a specific example of the welding object will be described. The plurality of terminals 14 are long members formed of copper, soft copper, or the like. One end of each terminal 14 is connected to the covered conductor 10 as will be described later, and the other end of each terminal 14 is electrically connected to other electrical components (power semiconductor element, relay, fuse, connector, etc.). It is configured to be possible. The coated conductive wire 10 is formed by applying an insulating coating such as polyurethane or polyimide on the surface of a conductive wire such as a copper wire or an annealed copper wire, and is, for example, an enameled wire. The covered conductive wire 10 and the terminal 14 are supported in a state of being in contact with each other by an insulating plate 16 as a support member. That is, the plurality of terminals 14 are inserted into the holding holes of the insulating plate 16 with one end projecting from one main surface of the insulating plate 16 and the other end projecting from the other main surface of the insulating plate 16. It is held by being done. Further, the coated conductor 10 is not removed from the coating, and is brought into contact with one end of each terminal 14 by a conductor holding projection (not shown) or the like standing on one main surface of the insulating plate 16. It is supported by a predetermined wiring pattern. Thereby, the covered conducting wire 10 and the terminal 14 are supported in a contact state on the one main surface side of the insulating plate 16. Further, the insulating plate 16 is held by the holding mechanism 60 in a fixed position and posture in a posture in which one end of each terminal 14 is directed to the irradiation position changing mechanism 30 side.

  The support member that holds the coated conductive wire 10 and the terminal 14 in contact with each other is not limited to the insulating plate 16 as described above. The support member should just be the structure which can support the conducting wire 10 with a cover and the terminal 14 in a contact state at least during laser welding. In other words, the target of laser welding by the laser welding apparatus 20 is the covered conductor 10 and the terminal 14 supported in contact with each other regardless of the support mode.

  The laser device 22 is a device that generates the laser light L in such a manner that the terminal 14 and the coated conductor 10 can be laser-welded. For example, a YAG laser device can be used.

  That is, normally, laser devices that generate the laser light L are broadly classified into those for surface processing such as marking and those for welding. As a laser device for surface processing, for example, a laser device with a Q switch that transmits laser light L by controlling the Q value of a laser transmitter is used. As a laser device for welding, such a Q device is used. A laser device without a switch is used. Usually, the laser device for surface processing has a small pulse width for emitting the laser beam L and a small laser processing diameter (that is, high energy density), and is limited to a limited range of the surface of the processing object. A laser beam L having a mode suitable for processing is generated. On the other hand, the laser device for welding has a large pulse width for emitting the laser beam L and a large laser processing diameter (low energy density), and processing inside the workpiece (for example, melting, drilling, etc.) The laser beam L having a mode suitable for the above is generated. Here, a laser device for welding is used as the laser device 22. The laser device 22 is capable of setting and changing the peak output of the laser beam L, the laser irradiation time (pulse duration of the laser beam L), and the number of irradiations per unit time.

  The irradiation position changing mechanism 30 is configured to be able to change the irradiation position of the laser light L from the laser device 22 with respect to the coated conductor 10 and the terminal 14. Here, as the irradiation position changing mechanism section 30, the attitude of one or more (here, two) mirrors 32 that reflect the laser light L from the laser device 22 is changed to a mirror driving section 34 such as a stepping motor or a galvano motor. Therefore, a configuration in which the optical path of the laser light L is changed to change the irradiation destination of the laser light L, for example, a so-called galvano optical head is used. The laser beam L from the laser device 22 is guided into the main irradiation position changing mechanism 30 via an optical fiber or the like, reflected by the mirror 32 in the irradiation position changing mechanism 30, and each coated Irradiation toward the conducting wire 10 and each terminal 14 is enabled. At this time, the irradiation destination of the laser beam L can be changed by changing the posture of each mirror.

  The welding control unit 40 is electrically connected to the irradiation position changing mechanism 30, and irradiates the surface of the welding target area of the coated conductor 10 with the laser beam L from the laser device 22 to irradiate the surface of the welding target area. After the coating is removed, the irradiation position changing mechanism is such that the laser beam L from the laser device 22 is irradiated to the spot to be welded between the coated conducting wire 10 and the terminal 14 to laser weld the coated conducting wire 10 and the terminal 14. The mirror driving unit 34 of the unit 30 is configured to be driven and controlled. In addition, since the generation | occurrence | production aspect of the laser beam L from the laser apparatus 22 is changed at the time of coating removal and laser welding here, the welding control unit 40 is also connected to the laser apparatus 22, The laser device 22 is also configured to perform control.

  FIG. 2 is a block diagram showing the welding control unit 40. More specifically, the welding control unit 40 is constituted by a general computer in which a CPU 42, a RAM 44, a storage 46, an input unit 48, a display unit 50, external connection interfaces 52 and 54 and the like are interconnected via a bus line 58. It is configured.

  CPU42 performs the process as the welding control part 42a by performing a calculation process according to the welding control program 46a stored in the storage 46 as a main control part. This processing function will be further described in detail according to a flowchart described later.

  The RAM 44 is provided as a work area when the CPU 42 performs a predetermined process.

  The storage 46 is an auxiliary storage device composed of a nonvolatile storage device such as a hard disk device or a flash memory. In this storage 46, a welding control program 46a that performs processing for controlling the operation of the irradiation position changing mechanism 30 and the laser device 22, coating removal condition setting data 46b, coating removal position direction data 46c, welding condition setting data 46d, welding Position data 46e and the like are stored. In the coating removal condition setting data 46b, the peak output of the laser beam L by the laser device 22, the laser irradiation time (pulse duration of the laser beam L), and the number of irradiations per unit time are suitable for coating removal of the coated conductor 10. The data is defined to be a value, and is a value determined experimentally and empirically in advance so that the coating can be removed as much as possible. The welding condition setting data 46d is such that the peak output of the laser beam L by the laser device 22, the laser irradiation time (pulse duration of the laser beam L), and the number of irradiations per unit time are values suitable for laser welding. The value is determined experimentally and empirically in advance so that there is as much as possible no welding excess or insufficient welding. Usually, the peak output of the laser beam L, the laser irradiation time, and the number of irradiations per unit time defined by the coating removal condition setting data 46b are set to be smaller than those values in the welding condition setting data 46d. Moreover, the coating removal position direction data 46c is the irradiation of the laser beam L from the coating removal start position and the coating removal start position on the surface of the welding target region to be welded to the terminal 14 in the surface of the coated conductor 10. This data defines the location movement direction (coating removal direction). Here, since it is assumed that the plurality of terminals 14 are welded to the coated conductor 10 at a plurality of locations, a plurality of the coating removal start positions and coating removal directions are defined corresponding to the plurality of welding target region surfaces. ing. Further, the welding position data 46e is data defining a position (welding target spot) to be welded by irradiating the laser beam L when the welding target portion of the coated conductor 10 and the terminal 14 are laser welded. A plurality of welding positions are also defined corresponding to each welding location. These covering removal position direction data 46c and welding position data 46e are input and set by teaching or by an operator specifying coordinates or the like. Note that examples of the surface of the welding target region and the welding target spot will be described later.

  The input unit 48 includes a plurality of switches, a touch panel, and the like, and is configured to accept various instructions, settings, and the like for the main welding control unit 40.

  The display unit 50 is a liquid crystal display device or the like, and is configured to display various information such as various setting screens and various work screens of the main welding control unit 40.

  The external connection interfaces 52 and 54 are input / output circuits for the main welding control unit 40 to transmit and receive various signals to and from an external device, and are connected to the irradiation position changing mechanism 30 and the laser device 22 so as to be able to communicate with each other. ing.

  Note that some or all of the processing functions performed by the welding control unit 40 may be realized by hardware using a dedicated logic circuit or the like.

  FIG. 3 is a flowchart showing the processing of the welding control unit 40, FIG. 4 is an explanatory diagram showing the coating removal operation by the laser welding apparatus 20, and FIG. 5 is an explanatory diagram showing the coated conductor 10 during coating removal. FIG. 6 is an explanatory view showing a laser welding operation by the laser welding apparatus 20, and FIG. 7 is an explanatory view showing the coated conductor 10 and the terminal 14 during the laser welding.

  First, the operator sets the insulating plate 16 that supports the covered conductive wire 10 and the terminal 14 in the holding mechanism unit 60. Thereby, each covered conducting wire 10 and each terminal 14 are held in a predetermined position and posture while being in contact with each other. Then, an operator or the like inputs a laser welding start command.

  Then, in step S1, the welding control unit 40 gives a command to the laser device 22 so as to set the coating removal condition defined in the coating removal condition setting data 46b. Thereby, the laser apparatus 22 will be in the state set so that the laser beam L was generable on the said coating removal conditions.

  In the next step S2, the welding control unit 40, based on the coating removal position direction data 46c, corresponds to one of the connection points between the coated conductive wire 10 and the terminal 14 and the surface of the welding target region surface of the coated conductive wire 10. A command is given to the irradiation position changing mechanism 30 so that the laser beam L is irradiated to the coating removal start position. Thereby, the irradiation position changing mechanism unit 30 changes the posture of the mirror 32 by driving the mirror driving unit 34 so that the irradiation destination of the laser light L from the laser device 22 becomes the coating removal start position.

  In the next step S3, the welding control unit 40 gives a laser beam L irradiation start command to the laser device 22 and, based on the coating removal position direction data 46c, the irradiation destination of the laser light L along the corresponding coating removal direction. A command is given to the irradiation position changing mechanism unit 30 so as to move a plurality of times (here, to move twice along the coating removal direction, that is, to reciprocate once). Thereby, the laser beam L from the laser device 22 is irradiated so as to reciprocate once on the surface 10F of the welding target region of the coated conductor 10, and when the movement of the irradiation destination of the laser beam L is completed, the irradiation of the laser beam L is performed. Stopped (see FIG. 4). Here, the welding target region surface 10F has an oval shape (see FIG. 5). The laser device 22 generates the laser light L at a predetermined output of the predetermined laser light L, a predetermined laser irradiation time, and a predetermined number of irradiation times per unit time. Therefore, the laser beam L is emitted in such a manner that the substantially edge-shaped irradiation region of the laser beam L at each irradiation timing continues continuously from one end side to the other end side along the longitudinal direction of the surface 10F of the welding target region. Irradiated to the surface 10F of the welding target area. Thereby, the coating | cover in the said welding object area | region surface 10F is removed. The state when the coating is removed will be described in detail later.

  In step S4 after the end of step S3, the welding control unit 40 determines whether or not the coating removal for all the welding target area surfaces 10F has been completed, and when it is determined that all the coating removal has not been completed. It returns to step S2 and repeats the process of step S2 and S3 with respect to the welding object area | region surface 10F which is not coat-removed. On the other hand, if it is determined in step S4 that all coating removal has been completed, the process proceeds to step S5.

  In the next step S5, the welding control unit 40 gives a command to the laser device 22 so as to set the welding conditions specified in the welding condition setting data 46d. Thereby, the laser apparatus 22 will be in the state set so that the laser beam L was generable on the said welding conditions.

  In the next step S6, the welding control unit 40 applies the laser beam L to the welding position (welding target spot) corresponding to one of the connection points between the coated conductor 10 and the terminal 14 based on the welding position data 46e. A command is given to the irradiation position changing mechanism 30 so that the irradiation is performed. Thereby, the irradiation position changing mechanism unit 30 changes the posture of the mirror 32 by driving the mirror driving unit 34 so that the irradiation destination of the laser light L from the laser device 22 becomes the welding position.

  In next step S <b> 7, the welding control unit 40 gives a laser beam L irradiation start command to the laser device 22. As a result, the laser beam L from the laser device 22 is irradiated to the welding position 10S between any one of the terminals 14 and the coated conductor 10, and the irradiation of the laser beam L is stopped when a predetermined time required for welding has elapsed. (See FIG. 6). The welding position between any one of the terminals 14 and the covered conducting wire 10 includes, for example, the contact position between the terminal 14 and the covered conducting wire 10, and both the terminal 14 and the covered conducting wire 1 are irradiated with the laser beam L. (See FIG. 7). However, as long as laser welding of the terminal 14 and the coated conductor 10 can be performed by irradiation of the laser beam L, only one of the terminal 14 and the coated conductor 10 may be irradiated with the laser beam L. Thereby, any one of the terminals 14 and the covered conductor 10 are laser-welded.

  In step S8 after the completion of step S7, the welding control unit 40 determines whether or not laser welding for all welding positions has been completed, and if it is determined that all laser welding has not been completed, the process proceeds to step S6. It returns and repeats the process of step S6 and S7 with respect to the welding position which is not laser-welded. On the other hand, if it is determined in step S8 that all laser welding has been completed, the process is terminated.

  According to the laser welding apparatus 20 configured as described above, the laser beam L from the laser apparatus 22 is irradiated to the welding target area surface 10F of the coated conductor 10 to remove the covering portion 10b of the welding target area surface 10F. Thereafter, the irradiation destination of the laser beam L is changed, and the laser beam L from the laser device 22 is irradiated to the spot to be welded between the coated conducting wire 10 and the terminal 14 to laser weld the coated conducting wire 10 and the terminal 14. ing. For this reason, the coated conductor 10 and the terminal 14 can be laser-welded in a state where the coating is removed to some extent, and quality deterioration (contact failure, insufficient connection strength) due to the remaining carbonized coating, adhesion of flaws and It is possible to suppress a decrease in aesthetics due to the remaining molten coating. Moreover, since the coating removal operation | work of the covered conducting wire 10 and the laser welding operation are performed by changing the irradiation destination from the same laser apparatus 22, the laser welding operation of the said covered conducting wire 10 and the terminal 14 is carried out. Can be performed quickly and easily, and the equipment cost can be reduced.

  In addition, since the laser beam L from the laser device 22 is irradiated to the surface 10F of the welding target region 10F of the coated conductor 10 a plurality of times while radiating the coating removal rod, a welding laser device is used. Even if it exists, the coating | cover of the conductor 10 with a coating can be removed appropriately.

  This will be described with reference to FIGS. FIGS. 8-11 has shown the state irradiated with moving the laser beam L only for one way along the longitudinal direction with respect to the welding object area | region surface 10F.

  First, as shown in FIG. 8, the laser beam L is irradiated to the coating removal start position of the surface 10F of the welding target area. At this time, if it is attempted to remove the coating by irradiation with the laser beam L in one way, it is necessary to irradiate the laser beam L so as to give an energy amount sufficient to remove the entire thickness direction of the coating. In this case, the thermal influence range M on the surface of the conductor portion 10a is relatively wide, and the residue 10c carbonized by the coating portion 10b is present at the peripheral portion of the irradiation portion of the laser beam L in the coating portion 10b. Will occur.

  In this state, as shown in FIG. 9, when the irradiation destination of the laser beam L moves, the laser beam L is irradiated to the carbonized residue 10c. The residue 10c usually has a darker color than the surrounding color, and easily absorbs the laser light L. For this reason, when the residue 10c is irradiated with the laser beam L, as shown in FIGS. 10 and 11, the residue 10c is seized, and the thermal influence range M on the surface of the conductor portion 10a is increased. As a result, various properties of the coated conductor 10 are reduced.

  The phenomenon as described above can be avoided by appropriately setting the peak output of the laser beam L, the laser irradiation time (pulse duration of the laser beam L), the number of irradiations per unit time, and the like.

  However, in the case of the type of the laser device 22, especially one used as a laser device for welding, it is appropriate due to restrictions on the setting range such as the peak output of the laser light L, the laser irradiation time, the number of irradiations per unit time, etc. It may be difficult to make a correct setting.

  Therefore, in such a case, the coating of the coated conductor 10 can be appropriately removed by irradiating the laser beam L from the laser device 22 to the welding target area surface 10F of the coated conductor 10 while moving it a plurality of times. .

  That is, as shown in FIG. 12, the laser beam L is emitted from the laser device 22 so that only the surface layer portion of the coated portion 10b can be removed in the outward path where the laser beam L is irradiated while moving to the surface 10F to be welded of the coated conductor 10. Irradiate light L. For example, the laser beam L is irradiated in such a manner that the peak output of the laser beam L is reduced, the laser irradiation time is shortened, or the number of irradiations per unit time is decreased. Alternatively, the moving speed of the irradiation destination of the laser beam L with respect to the surface 10F to be welded is increased. By appropriately setting these and the like, the laser beam L is irradiated in such a manner that only the surface layer portion of the covering portion 10b can be removed.

  At this time, since the laser light L mainly acts on a part of the surface layer of the covering portion 10b, it is considered that the thermal influence on the conductor portion 10a can be reduced. By the laser beam L, the surface layer of the covering portion 10b is evaporated or melted and deformed to be in a state of remaining solidified on the surface. At this time, the covering portion 10b is hardly carbonized because the covering portion 10b is irradiated with the laser beam L that mainly acts on the surface layer. For this reason, generation | occurrence | production of the carbonized residue can be decreased.

  Then, as shown in FIG. 13, in the traveling path of the laser beam L, the laser beam L from the laser device 22 is irradiated to the welding target region surface 10 </ b> F of the coated conductor 10 while moving again as described above. Thereby, the coating | coated part 10b which remained on the welding object area | region surface 10F is removed.

  At this time, the energy of the laser light L applied to the remaining coating portion 10b is smaller than that shown in FIG. Moreover, since generation | occurrence | production of the carbonized residue is suppressed on the welding object area | region surface 10F (refer FIG. 12), the energy absorption of the laser beam L by the said carbonized residue is also suppressed. For this reason, the covering portion 10b is hardly carbonized, and the generation of carbonized residue can be reduced. Further, the thermal influence range M on the conductor portion 10a can be made relatively small.

  In this way, the laser beam L from the laser device 22 is applied to the surface 10F of the welding target region 10F of the coated lead wire 10 while being moved a plurality of times on the coating removal rod, thereby using a welding laser device or the like. Even in this case, the coating of the coated conductor 10 can be removed while suppressing the generation of carbides and reducing the thermal influence on the conductor portion 10a.

  In the above-described embodiment, the example in which the irradiation destination of the laser beam L is reciprocated once with respect to the surface 10F of the welding target region has been described. However, the laser beam L may be moved a plurality of times in other modes. For example, the irradiation destination of the laser beam L may be an example in which the laser beam L is reciprocated multiple times with respect to the welding target region surface 10F, or an example in which the laser beam L is moved a plurality of times in one direction.

  In fact, using a laser device for welding, an experiment was performed under conditions suitable for removing the coating. The common experimental conditions are that a YAG laser device having a wavelength of 1064 nm is used, the laser processing diameter is 600 μm, and the moving speed of the irradiation destination of the laser light L is about 1 mm / sec. The degree of removal of the coating was evaluated by the presence or absence of conduction. In addition, the presence or absence of residues was also evaluated.

  In Example 1, the peak output was changed. The laser irradiation time is 1.0 ms, the number of movements is 6, and the number of irradiations per second is 10.

  In this case, it was confirmed that sufficient conduction was obtained when the peak output was 0.6 kW and 0.8 kW, and there was no problem with the residue. It was confirmed that when the peak output was 0.2 kW and 0.4 kW, conduction was insufficient, and when the peak output was 1.0 kW and 1.2 kW, a large amount of carbonized residue was generated.

  In Example 2, the laser irradiation time was changed. The peak output is 0.7 kW, the number of movements is 6, and the number of irradiations per second is 10 times.

  In this case, it was confirmed that sufficient conduction was obtained when the laser irradiation time was 0.8 ms, 1 ms, and 1.2 ms, and there was no problem with the residue. It was confirmed that when the laser irradiation time was 0.4 ms and 0.6 ms, the conduction was insufficient, and when the laser irradiation time was 1.4 ms and 1.6 ms, a large amount of carbonized residue was generated.

  In Example 3, the number of movements (number of overwriting) was changed. The peak output is 0.7 kW, the laser irradiation time is 1.0 ms, and the number of irradiations per second is 10 times.

  In this case, it was confirmed that sufficient conduction was obtained when the number of movements was 5, 6, and 7, and there was no problem with the residue. Moreover, it was estimated from the remaining state of the coating on the surface that there was no problem even if the number of movements was increased more than this. On the other hand, when the number of times of movement is 1 to 4 times, it has been confirmed that conduction is insufficient.

  In Example 4, the number of irradiations per second was changed. The peak output is 0.7 kW, the laser irradiation time is 1.0 ms, and the number of movements is six.

  In this case, it was confirmed that sufficient conduction was obtained when the number of irradiations per second was 7, 10, and 12, and there was no problem with the residue. When the number of irradiations per second is 5, conduction is insufficient, and when the number of irradiations per second is 15 or 18, many carbonized residues are generated. It was done.

{Modifications}
In the embodiment described above, the irradiation position changing mechanism 30 that changes the irradiation destination of the laser light L by changing the attitude of the reflecting mirror has been described. However, the laser device 22 with respect to the coated conductive wire 10 and the terminal 14 is changed according to other configurations. You may make it change the irradiation position of the laser beam L from. For example, the irradiation position changing mechanism unit can move the holding unit that indirectly or directly holds the coated conducting wire 10 and the terminal 14 in the XY direction with respect to the laser welding head that emits the laser beam L. It may be an XY transport mechanism that supports, or XY that supports a laser welding head that emits laser light L movably in the XY direction with respect to the coated conductor 10 and the terminal 14 held at a fixed location. The structure which changes the attitude | position of a laser welding head so that the conveyance destination or the irradiation destination of the laser beam L may be changed may be sufficient. In short, the irradiation position changing mechanism unit may be configured to be able to change the irradiation position of the laser light L with respect to the coated conductor 10 and the terminal 14.

  In the above embodiment, the laser welding is performed on the plurality of welding spots after all of the coating removal of the plurality of welding target region surfaces 10F is performed. However, the coating removal of the welding target region surface 10F and the laser welding are alternately performed. You can go to.

  In addition, each structure demonstrated by the said embodiment and its modification can be combined suitably, unless it mutually contradicts.

DESCRIPTION OF SYMBOLS 10 Coated conductor 10a Conductor part 10b Coated part 10F The surface of this welding object area | region 14 Terminal 20 Laser welding apparatus 22 Laser apparatus 30 Irradiation position change mechanism part 40 Welding control unit 42a Welding control part L Laser beam

Claims (2)

A laser welding apparatus for laser welding a coated conductor and a terminal held in contact;
A laser device capable of generating laser light;
An irradiation position changing mechanism that enables changing the irradiation position of the laser light from the laser device, with respect to the coated conductor and the terminal,
After the laser beam from the laser device is irradiated on the surface of the welding target region of the coated conductor to remove the coating on the surface of the welding target region, the laser beam from the laser device is applied between the coated conductive wire and the terminal. A welding control unit that controls the irradiation position changing mechanism so as to laser-weld the coated conductor and the terminal by irradiating a spot to be welded;
A laser welding apparatus comprising: The laser welding apparatus according to claim 1,
The welding control unit
A laser for controlling the irradiation position changing mechanism so as to remove the coating on the surface of the welding target region by irradiating the surface of the welding target region of the coated conductor with the laser beam from the laser device a plurality of times. Welding equipment.

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