JP2011192465A - Method of manufacturing electric wire with terminal, electric wire with terminal and core wire cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To crimp a terminal onto an electric wire while restraining a strand from sticking out. <P>SOLUTION: A method is provided for manufacturing an electric wire with a terminal 10 equipped with an electric wire 12 having a core wire 14 with a plurality of aluminum strands put together and an insulation coating 18 for covering an outer periphery of the core wire 14, and a terminal 20 crimped to exposed core wires 15 at an end of the electric wire 12. The aluminum strands are jointed with each other with pressure added to the exposed core wire 15, the ends of the exposed core wires 15 with the aluminum strands jointed with each other are trimmed, and the terminal 20 is crimped to the exposed core wires 15 with their ends trimmed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for crimping a terminal to an electric wire.

  Conventionally, Patent Document 1 discloses a technique for crimping a terminal to an electric wire.

  In Patent Document 1, a conductor is exposed at an end portion of an electric wire to be a crimped portion, the strands of the crimped portion are joined only in a predetermined amount region, and the strands of the crimped portion are not crimped. Crimp terminals are crimped to the joints.

Japanese Patent Laid-Open No. 9-7647

  By the way, in recent years, the use of aluminum electric wires has been studied for the purpose of reducing the weight of automotive wire harnesses.

  However, when a terminal is crimped to a core wire in which a plurality of aluminum strands are assembled, an electrical resistance between the core wire and the terminal is increased by a durability test after the crimping. The above is considered to be caused by the fact that an oxide film or the like is formed on the surface of each strand after crimping, and the resistance between the strands increases. Therefore, a technique has been proposed in which a core wire exposed at an end portion of an electric wire is ultrasonically welded and then a terminal is crimped to the core wire.

  However, in this case, the core wire extends due to the pressure applied to the core wire during ultrasonic welding. Thereby, the end part of the exposed core wire becomes uneven, and problems such as the strands protruding from the terminal after crimping may occur. The wire protruding from the terminal may interfere with a member (also called a lance) that engages with the terminal in the connector housing. This may cause incomplete insertion when the terminal is inserted into the connector housing.

  Then, an object of this invention is to enable it to crimp a terminal to an electric wire, suppressing the protrusion of a strand.

  In order to solve the above-described problem, the first aspect is crimped to an electric wire having a core wire in which a plurality of aluminum strands are assembled and an insulating coating covering an outer periphery of the core wire, and an exposed core wire at an end of the electric wire. A method of manufacturing a terminal-attached electric wire comprising a terminal, wherein (a) a step of applying pressure to the exposed core wires to join the aluminum strands together; and (b) the aluminum strands being joined together. A step of trimming an end portion of the exposed core wire; and (c) a step of crimping a terminal to the exposed core wire having the end portion trimmed.

  Moreover, a 2nd aspect is equipped with the electric wire which has the core wire in which the some aluminum strand was assembled, the insulation coating which covers the outer periphery of the said core wire, and the terminal crimped | bonded to the exposed core wire of the edge part of the said electric wire, Pressure is applied to the exposed core wire to join the aluminum strands together, the end portions of the exposed core wires are trimmed, and the terminals are crimped to the exposed core wires whose end portions are trimmed. It is an electric wire with a terminal.

  A 3rd aspect is a core wire cutting device for cut | disconnecting the exposed core wire of an electric wire edge part, Comprising: The core wire insertion recessed part which can insert the said exposed core wire in the state which protruded the edge part of the said exposed core wire is formed. In addition, a positioning opening edge for positioning the exposed core along the axial direction by contacting the end surface of the insulating coating facing the base end of the exposed core is formed in one side opening of the core wire insertion recess. The end of the exposed core wire protruding from the core wire insertion recess is provided at a position separated from the member and the end of the exposed core wire inserted into the core wire insertion recess from the positioning opening edge. A cutting part.

  A 4th aspect is a core wire cutting device which concerns on a 3rd aspect, Comprising: While the said positioning member is rotatably supported around a rotating shaft, the said some core wire insertion recessed part is a virtual centering on the said rotating shaft. The cutting part is formed at a position along the circle, the cutting part is provided at a position separated from the rotation axis by the radial dimension of the virtual circle, and the positioning opening edge parts of the core wire insertion recesses are formed by the cutting part. It is provided by changing the position from the cutting position, and the plurality of core wire insertion recesses are selectively disposed at positions corresponding to the cutting portions by the rotation of the positioning member.

  A fifth aspect is the core wire cutting device according to the third or fourth aspect, wherein the cutting portion has a cutting blade that can slide in contact with the positioning member at the other side opening of the core wire insertion recess, The exposed core wire is sheared between the cutting blade and the other opening edge of the core wire insertion recess.

  A 6th aspect is a core wire cutting device which concerns on a 5th aspect, Comprising: The said core wire insertion recessed part is a hole shape which draws an arc-shaped curved surface in the direction side where the said cutting blade moves at the time of cutting | disconnection, and the other side Is formed.

  7th aspect is a core wire cutting device which concerns on 3rd or 4th aspect, Comprising: The said cutting part has a pair of cutting blade which can cut | disconnect the edge part of the exposed core wire which protrudes from the said core wire insertion recessed part It is.

  According to the 1st aspect, since a terminal is crimped | bonded to the exposed core wire by which the edge part was trimmed, a terminal can be crimped | bonded to an electric wire, suppressing the protrusion of a strand.

  According to the 2nd aspect, the electric wire with a terminal by which the terminal was crimped | bonded, suppressing the protrusion of a strand can be obtained.

  According to the core wire cutting device according to the third aspect, the end of the exposed core wire protruding from the core wire insertion recess in a state where the end surface of the insulating coating facing the proximal end portion of the exposed core wire is in contact with the positioning opening edge. The portion can be cut, and the exposed core wire can be easily cut to a certain length. Moreover, by crimping the terminal to the core wires thus trimmed, the terminal can be crimped to the electric wire while suppressing the protrusion of the strand.

  According to the fourth aspect, since the positioning opening edge portions of the plurality of core wire insertion recesses are provided by changing the position from the cutting position by the cutting portion, the plurality of core wire insertion recesses are formed by the rotation of the positioning member. By selectively disposing at a position corresponding to the cutting portion, the cutting length of the exposed core wire can be easily changed with a simple configuration using one cutting portion.

  According to the fifth aspect, since the exposed core wire is sheared between the cutting blade and the other opening edge of the core wire insertion recess, the exposed core wire can be cut with a relatively simple configuration.

  According to the 6th aspect, since a cutting blade shears an exposed core wire between the linear edge part corresponding to the said plane among the other side opening edge parts of a core wire insertion recessed part, it can cut | disconnect an exposed core wire smoothly. Moreover, since the said core wire insertion recessed part is formed in the hole shape which draws an arcuate curved surface in the other side of the plane, an exposed core wire can be smoothly inserted and guided in a core wire insertion recessed part.

  According to the 7th aspect, since the said exposed core wire is sheared with a pair of cutting blade, an exposed core wire can be cut | disconnected more reliably.

It is a schematic perspective view which shows the electric wire with a terminal which concerns on embodiment. It is explanatory drawing which shows the manufacture procedure of an electric wire with a terminal. It is explanatory drawing which shows the manufacture procedure of an electric wire with a terminal. It is explanatory drawing which shows the manufacture procedure of an electric wire with a terminal. It is the schematic which shows the whole structure of the electric wire manufacturing apparatus with a terminal containing a core wire cutting device. It is a schematic front view which shows the positioning member and cutting part of a core wire cutting device. It is the schematic which shows the partial cross section of a positioning member, a cutting part, and an electric wire feeder. It is a schematic sectional drawing which shows a core wire insertion recessed part and a positioning opening edge part. It is a schematic sectional drawing which shows a core wire insertion recessed part and a positioning opening edge part. It is explanatory drawing which shows the core wire insertion recessed part which concerns on a modification. It is explanatory drawing which shows the core wire insertion recessed part which concerns on a modification. It is explanatory drawing which shows the cutting part which concerns on a modification.

<Method of manufacturing electric wire with terminal and electric wire with terminal>
FIG. 1 is a schematic perspective view showing a terminal-attached electric wire 10. In FIG. 1, the connection part of the electric wire 12 and the terminal 20 is shown.

  The terminal-attached electric wire 10 is configured such that the terminal 20 is crimped to the end of the electric wire 12.

  The electric wire 12 has a core wire 14 and an insulating coating 18. The core wire 14 has a configuration in which a plurality of aluminum strands are assembled. An aluminum strand is a wire formed of aluminum or an aluminum alloy. Usually, a plurality of aluminum strands are assembled in a twisted state. The insulating coating 18 is made of an insulating material such as a resin and covers the outer periphery of the core wire 14. Usually, the insulating coating 18 is formed by extrusion coating the outer periphery of the core wire 14.

  A predetermined length of the core wire 14 is exposed at the end of the electric wire 12. Here, the core wire 14 exposed at the end of the electric wire 12 is referred to as an exposed core wire 15. A pressure is applied to the exposed core wire 15 to join the plurality of aluminum strands. Further, the end portion of the exposed core wire 15 is aligned.

  The terminal 20 is formed by appropriately pressing a metal plate or the like, and is configured to be capable of being crimped to the exposed core wire 15. More specifically, the terminal 20 has a connection part (not shown) and a crimping part 22. The connecting portion is a portion that can be connected to a counterpart terminal or the like, and is a portion having a so-called tab-shaped male terminal shape or a cylindrical female terminal shape. The crimp portion 22 is a portion that is crimped to the end of the electric wire 12, and includes a core wire crimp portion 24 that is crimped to the exposed core wire 15, and a coated crimp portion 26 that is crimped to the insulating coating 18. The core wire crimping part 24 and the covering crimping part 26 have a substantially U shape before crimping. The exposed core wire 15 is disposed in the core wire crimping portion 24 and compressive force is applied to the core wire crimping portion 24 and the coating crimping portion 26 in a state where the end portion of the insulating coating 18 is disposed in the coating crimping portion 26. Then, the core crimping portion 24 is crimped to the exposed core wire 15 and the covering crimping portion 26 is crimped to the insulating coating 18. Thereby, the terminal 20 is crimped | bonded to the exposed core wire 15 by which the edge part was trimmed. Note that the coated crimping portion 26 may be omitted.

  According to the terminal-attached electric wire 10 configured as described above, the aluminum strands are aligned at the end of the exposed core wire 15 to which the core wire crimping portion 24 is crimped. For this reason, the protrusion of the aluminum strand from the core wire crimping portion 24 is suppressed. For this reason, when the terminal 20 is inserted into the connector housing, interference between the aluminum strand and the inner portion of the connector housing (for example, a lance for terminal positioning engagement) is suppressed, and incomplete insertion of the terminal 20 is suppressed. The

  The example of a manufacturing method of the said electric wire 10 with a terminal is demonstrated.

  First, as shown in FIG. 2, the insulation coating 18 is removed over a predetermined length at the end of the electric wire 12, thereby forming an exposed core wire 15 having a predetermined length at the end of the electric wire 12. Then, pressure P is applied to the exposed core wire 15 to join the aluminum strands together (step (a)). As joining here, ultrasonic welding, resistance welding, etc. are assumed. That is, any method may be used as long as pressure is applied to the exposed core wire 15 to apply some energy by vibration or electricity to join a plurality of aluminum strands. Here, it is assumed that ultrasonic welding is performed in which the exposed core wire 15 is joined in the radial direction by applying ultrasonic vibration to the exposed core wire 15 to join the aluminum strands together. ing.

  By joining a plurality of aluminum strands in this way, the electrical resistance between the plurality of aluminum strands is maintained in a low state. Thereby, an increase in electrical resistance between the core wire 14 and the terminal 20 can be suppressed even after a durability test or the like after crimping.

  When a pressure is applied to the exposed core wire 15 as described above to join a plurality of aluminum strands, the result is as shown in FIG. That is, the aluminum strand is stretched in the longitudinal direction by the pressure applied to the exposed core wire 15. Moreover, the amount of elongation of the plurality of aluminum strands is not always constant. For this reason, at the end portion of the exposed core wire 15, the tip end portion of the aluminum strand becomes uneven.

  Therefore, the ends of the exposed core wire 15 are trimmed after joining (step (b)). As a result, as shown in FIG. 4, an exposed core wire 15 is obtained in which the end portions are trimmed flat and a pair of pressure marks remain on the outer peripheral portion.

  Note that the length dimension of the exposed core wire 15 after trimming is set to be slightly larger than the length dimension required for crimping the core wire crimping portion 24, for example, the axial length of the core wire crimping portion 24. Is done. In addition, the length dimension of the exposed core wire 15 immediately after the insulation coating 18 is removed is also set to a dimension having a surplus length in consideration of the amount that the end portion of the exposed core wire 15 is trimmed and removed after joining.

  And the terminal 20 is crimped | bonded to the exposed core wire 15 by which the edge part was trimmed (process (c)). Then, as shown in FIG. 1, the terminal-attached electric wire 10 in which the terminal 20 is crimped to the end of the electric wire 12 is manufactured.

<Core cutting device>
A core wire cutting device, which is a device suitable for manufacturing the electric wire 10 with terminal, will be described. FIG. 5 is a schematic diagram showing the overall configuration of the terminal-attached electric wire manufacturing apparatus 40 including the core wire cutting device 70.

  For convenience of explanation, the overall configuration of the terminal-attached electric wire manufacturing apparatus 40 will be described. The terminal-attached electric wire manufacturing apparatus 40 includes a welding device 42, a core wire cutting device 70, a terminal crimping device 50, and an electric wire feeding device 60.

  The welding device 42 has a pair of pressure members 44 and is a device for joining the aluminum strands by applying pressure to the exposed core wire 15 sandwiched between the pair of pressure members 44. As the welding apparatus 42, various welding apparatuses including a known ultrasonic welding apparatus or a known resistance welding apparatus can be used.

  The core wire cutting device 70 is a device for cutting and aligning the end of the exposed core wire 15 of the electric wire 12. The core wire cutting device 70 will be described more specifically later.

  The terminal crimping device 50 is a device for crimping the terminal 20 to the exposed core wire 15. As the terminal crimping device 50, various terminal crimping devices including a known terminal crimping device capable of crimping a separately conveyed terminal to the exposed core wires 15 that are sequentially fed can be used. It is preferable that the terminal crimping device 50 is configured to be capable of continuously crimping the terminal 20 continuously supplied as a chain terminal or the like. The terminal crimping device 50 is preferably configured so that a terminal crimping die or the like can be manually or automatically replaced, and different types of terminals can be crimped.

  The wire feeder 60 holds the end portion of the insulating coating 18 of the wire 12 and sequentially moves the exposed core wire 15 to a welding position by the welding device 42, a cutting position by the core wire cutting device 70, and a crimping position by the terminal crimping device 50. It is configured to let you.

  More specifically, the electric wire feeder 60 has a clamp part 61, a main transport mechanism part 62, and an advance / retreat mechanism part 64.

  The clamp part 61 is configured to be able to hold and release the end of the electric wire 12. Here, the clamp part 61 is configured to drive the pair of movable pieces 61a to approach and separate by external air pressure or electromagnetic force. And the end part of the electric wire 12 is clamped by moving a pair of movable piece 61a close, and pinching of the electric wire 12 is cancelled | released by moving apart a pair of movable piece 61a.

  The main transport mechanism 62 includes a linear motor, a linear actuator such as a linear drive mechanism having a screw shaft, a motor that rotationally drives the screw shaft, and a nut portion that is screwed to the screw shaft. Here, the main transport mechanism 62 can be driven back and forth by the main transport drive main body 62a extending along the front of the welding device 42, the core wire cutting device 70, and the terminal crimping device 50, and the main transport drive main body 62a. And a main transport direction movable body 62b supported by the main body. And the main conveyance direction movable body 62b is reciprocated to the position facing each of the welding apparatus 42, the core wire cutting device 70, and the terminal crimping apparatus 50 by the drive of the main conveyance drive main-body part 62a.

  The advance / retreat mechanism unit 64 is configured by a linear actuator similar to the main transport mechanism unit 62, and is advanced / retracted by the advance / retreat drive main body 64a provided on the main transport direction movable body 62b and the advance / retreat drive main body 64a. And a forward / backward movable body 64b supported to be drivable. Then, at a position facing each of the welding device 42, the core wire cutting device 70, and the terminal crimping device 50, the forward / backward moving body 64b is driven from the main transport mechanism 62 by the drive of the forward / backward drive main body portion 64a. It is moved forward and backward toward the device 70 and the terminal crimping device 50.

  The clamp part 61 is provided on the forward / backward movable body 64b. Then, by driving the main transport mechanism 62, the clamp unit 61 is sequentially transported and moved to a position facing the welding device 42, a position facing the core wire cutting device 70, and a position facing the terminal crimping device 50. In addition, the clamp unit 61 is connected to the welding device 42, the core wire cutting device 70, and the terminal crimping device 50 at positions facing the welding device 42, the core wire cutting device 70, and the terminal crimping device 50 by driving the advance / retreat mechanism 64. It is driven forward and backward.

  A pressing absorption mechanism 66 is interposed between the clamp 61 and the forward / backward movable body 64b. The configuration and role of the pushing absorption mechanism 66 will be described later in relation to the core wire cutting device 70.

  6 is a schematic front view showing a positioning member 72 and a cutting portion 90 of the core wire cutting device 70, and FIG. 7 is a schematic view showing a partial cross section of the positioning member 72, the cutting portion 90 and the wire feeder 60. 8 and 9 are schematic cross-sectional views showing the core wire insertion recess 76 and the positioning opening edge 78. FIG.

  The core wire cutting device 70 is a device for cutting the exposed core wire 15 at the end of the electric wire 12, and includes a positioning member 72 and a cutting portion 90.

  The positioning member 72 has a disc-shaped positioning plate 74, and a core wire insertion recess 76 and a positioning opening edge 78 are formed on the positioning plate 74.

  The positioning plate 74 is supported so as to be rotatable around a predetermined rotation axis. Here, the positioning plate 74 is rotatably supported by a drive shaft portion 82a of the rotation drive portion 82 supported by a bracket (not shown). The rotation drive unit 82 is configured by a motor that can adjust the amount of rotation, such as a stepping motor.

  The positioning plate 74 has a plurality of core wire insertion recesses 76 and positioning opening edge portions 78 spaced along a virtual circle centered on the rotation axis (here, evenly spaced). Is formed.

  Then, by rotating the positioning plate 74 by driving the rotation driving unit 82, one of the plurality of core wire insertion recesses 76 and the positioning opening edge portion 78 selectively performs the wire insertion operation from the wire feeder 60. It is arranged at the receiving position. The position for receiving the wire insertion operation from the wire feeder 60 is also a position corresponding to the cutting unit 90.

  Moreover, the core wire insertion recess 76 is formed in a hole shape into which the exposed core wire 15 can be inserted. Here, the core wire insertion recess 76 is formed in a round hole shape. Moreover, the core wire insertion recessed part 76 is smaller than the length dimension of the exposed core wire 15 after joining aluminum strands by applying a pressure. Further, the length is set to about the length necessary for crimping the core crimping portion 24 to the exposed core 15. The exposed core wire 15 can be inserted into the core wire insertion recess 76 with the end portion of the exposed core wire 15 exposed.

  The core wire insertion recess 76 does not necessarily have a hole shape, and may have a slit groove shape opened to one side.

  The positioning opening edge portion 78 is formed as an annular plane substantially orthogonal to the axial direction of the core wire insertion recess 76 in one side opening of the core wire insertion recess 76 (see FIGS. 8 and 9). When the exposed core wire 15 is inserted into the core wire insertion recess 76, the end surface of the insulating coating 18 facing the proximal end portion of the exposed core wire 15 comes into contact with the positioning opening edge 78, and the exposed core wire 15 is moved along its axial direction. It is configured to position. When the exposed core wire 15 is inserted into the core wire insertion recess 76, the diameter of the core wire insertion recess 76 (that is, the positioning opening edge) is used to ensure that the end surface of the insulating coating 18 is brought into contact with the positioning opening edge 78. The inner diameter of the portion 78 is preferably set smaller than the diameter of the insulating coating 18 of the electric wire 12.

  Note that the positioning opening edge 78 does not necessarily have to be formed in an annular planar shape as described above. It may have a shape that can contact only a part of the annular end surface of the insulating coating 18, or a configuration in which a part of the inclined surface of the guide surface 80 described later contacts the end surface of the insulating coating as a positioning opening edge. There may be.

  The plurality of core wire insertion recesses 76 are formed in hole shapes in which at least one of the length dimension and the diameter is different. The reason why the length dimension is different among the plurality of core wire insertion recesses 76 is that the length dimension required for crimping the core crimp part 24 varies depending on the type of the terminal 20 to be crimped. Further, the reason why the diameters are different among the plurality of core wire insertion recesses 76 is to make the size according to the diameter of the exposed core wire 15 of the electric wire 12 to be processed. In addition, when the length dimension of the some core wire insertion recessed part 76 is each formed in different length as mentioned above, the some positioning opening edge part 78 is a position from the cutting position (it mentions later) of the cutting part 90. It will be arranged by changing.

  Here, when the electric wire 12 held by the clamp portion 61 is inserted into the core wire insertion recess 76, the end surface of the insulating coating 18 of the electric wire 12 is pushed against the positioning opening edge 78 according to the position of the positioning opening edge 78. You need to be able to guess. Therefore, here, the pressing absorption mechanism 66 is interposed between the clamp 61 and the forward / backward movable body 64b.

  The pushing absorption mechanism 66 includes a pushing adjustment movable body 67 and an urging member 67a (see FIG. 7). The pressing adjustment movable body 67 is supported by a support rod 66a supported by the advance / retreat direction movable body 64b so as to be movable along the advance / retreat direction to the core wire insertion recess 76. The urging member 67 a is configured by a coil spring or the like fitted on the support rod 66 a and urges the pressing adjustment movable body 67 in the insertion direction into the core wire insertion recess 76. Then, when the advance / retreat direction movable body 64b is moved in the insertion direction into the core wire insertion recess 76 by driving the advance / retreat mechanism section 64, the pressing adjustment movable body 67, the clamp portion under the biased state by the biasing member 67a. 61 and the electric wire 12 held thereby move together with the movable body 64b in the advance / retreat direction in the insertion direction into the core wire insertion recess 76. On the way, when the end surface of the insulation coating 18 of the electric wire 12 contacts the positioning opening edge 78, the urging member 67a contracts, and the pressing adjustment movable body 67 moves backward with respect to the forward / backward movable body 64b. Move relative to. Thereby, the clamp part 61 and the electric wire 12 hold | maintained by it stop in a fixed position. Thereby, the end surface of the insulating coating 18 of the electric wire 12 can be pressed against the positioning opening edge 78 regardless of the position of the positioning opening edge 78.

  The positioning member 72 is formed with a guide surface 80 that sequentially expands outward from one side opening of the core wire insertion recess 76 and guides the exposed core wire 15 toward the core wire insertion recess 76. Here, the guide surface 80 is formed in a conical outer surface shape that gradually expands outward from the outer peripheral edge of the positioning opening edge 78 at one side opening of the core wire insertion recess 76.

  However, the guide surface 80 may have a shape that sequentially expands into a pyramid shape or a trumpet shape. Moreover, the guide surface may be formed in a member different from the member in which the core wire insertion recess is formed.

  When the exposed core wire 15 is pushed into the core wire insertion recess 76, the tip of the exposed core wire 15 comes into sliding contact with the guide surface 80 and is guided toward the core wire insertion recess 76. When the exposed core wire 15 is inserted into the core wire insertion recess 76, the end surface of the insulating coating 18 at the base end portion of the exposed core wire 15 comes into contact with the positioning opening edge 78, and the exposed core wire 15 is positioned along the axial direction. . In this state, the length dimension portion necessary for crimping the core wire crimping portion 24 of the exposed core wire 15 is disposed in the core wire insertion recess 76 and is necessary for crimping the core wire crimping portion 24 of the exposed core wire 15. A portion exceeding the length is extended from the other side opening of the core wire insertion recess 76. Therefore, when the leading end portion of the exposed core wire 15 extending from the other side opening of the core wire insertion recess 76 is cut, the exposed core wire 15 is trimmed to a length dimension necessary for crimping the core wire crimping portion 24. Become.

  A stepped positioning opening edge 78 exists between the guide surface and the core wire insertion recess 76. However, normally, the thickness of the insulating coating 18 is sufficiently small, and therefore the width of the positioning opening edge 78 for positioning such an insulating coating 18 can be made sufficiently small. For this reason, the exposed core wire 15 can be smoothly guided toward the core wire insertion recess 76 regardless of the presence of the stepped positioning opening edge portion 78.

  The cutting portion 90 is provided at a position away from the positioning opening edge 78 toward the end side of the exposed core wire 15 inserted into the core wire insertion recess 76, and the end portion of the exposed core wire 15 protruding from the core wire insertion recess 76 is provided. It is configured to be cuttable. Here, the cutting part 90 is provided in the other side opening edge part of the core wire insertion recessed part 76, and it is comprised so that the edge part of the exposed core wire 15 can be cut | disconnected by the other side opening edge part of the core wire insertion recessed part 76.

  More specifically, the cutting unit 90 includes a cutting blade 92 and a blade driving unit 94.

  The blade drive unit 94 is composed of an actuator such as an air cylinder or a hydraulic cylinder, and has a rod portion 94a that is driven forward and backward. The blade driving portion 94 is supported by a bracket (not shown) at a position separated from the rotation axis of the positioning plate 74 to the side of the radius of the virtual circle (that is, the distance between the rotation shaft and the core wire insertion recess 76). Has been.

  The cutting blade 92 is formed as a single blade having a main surface 92a along the cutting direction and an inclined blade 92b inclined with respect to the main surface 92a. This cutting blade 92 is slidably brought into contact with the surface of the positioning plate 74 on the other side opening side of the core wire insertion recess 76 at a position where the blade driving portion 94 receives the wire insertion operation from the wire feeder 60. It is supported so that it can be moved forward and backward.

  Then, the exposed blade 15 is inserted into the core wire insertion recess 76, and the cutting blade is driven by the blade drive portion 94 in a state where the tip of the exposed core wire 15 protrudes from the other opening of the core wire insertion recess 76. When 92 is driven to advance so as to close the other side opening of the core wire insertion recess 76, the exposed core wire 15 is sheared between the tip of the cutting blade 92 and the other side opening edge of the core wire insertion recess 76. (See the two-dot chain line in FIG. 7).

  Operation | movement of the electric wire manufacturing apparatus 40 with a terminal comprised in this way is demonstrated.

  In the initial state, depending on the type of the electric wire 12 or the terminal 20 to be processed, one of the plurality of core wire insertion recesses 76 and the positioning opening edge 78 is selectively transferred from the electric wire feeder 60. It is arranged at a position corresponding to the position for receiving the wire insertion operation and the cutting portion 90.

  At this time, when information on the electric wire 12 or the terminal 20 to be processed is input, one of the plurality of core wire insertion recesses 76 and the positioning opening edge portion 78 is automatically selected, and the selected core wire is inserted. The positioning member 72 may be automatically rotated by driving the rotation driving unit 82 so that the recess 76 and the positioning opening edge 78 are disposed at a position corresponding to the wire insertion operation and a position corresponding to the cutting unit 90. preferable.

  First, the insulation coating 18 at the end of the electric wire 12 is removed by a separate coating removal device or the like, and the exposed core wire 15 is formed at the end. The insulating coating 18 at the end of the electric wire 12 is held by the clamp portion 61 of the electric wire feeder 60.

  The wire feeder 60 moves the exposed core wire 15 of the electric wire 12 held by the clamp unit 61 to a position facing the welding device 42, and then moves the exposed core wire 15 between the pair of pressure members 44 of the welding device 42. Move forward (see FIG. 5). Then, the aluminum strands are joined together in a state where the exposed core wire 15 is sandwiched between the pair of pressure members 44. Thereafter, the wire feeder 60 retracts the exposed core wire 15 from the pair of pressure members 44 and then moves it to a position facing the core wire cutting device 70.

  Next, the wire feeder 60 moves the exposed core wire 15 toward the core wire insertion recess 76 (see FIGS. 5 to 7). Then, the tip of the exposed core wire 15 comes into sliding contact with the guide surface 80 and is guided toward the core wire insertion recess 76. When the exposed core wire 15 is inserted into the core wire insertion recess 76 and the end surface of the insulating coating 18 at the base end portion of the exposed core wire 15 contacts the positioning opening edge 78, the clamp portion 61 and the electric wire 12 held thereby. Moves backward relative to the forward / backward movable body 64b and stops at a fixed position. As a result, the exposed core wire 15 is positioned at a fixed position in which the end surface of the insulating coating 18 is brought into contact with the positioning opening edge 78.

  In this state, a portion of the exposed core wire 15 that exceeds the length dimension necessary for crimping the core wire crimping portion 24 extends from the other side opening of the core wire insertion recess 76. In this state, the blade driving unit 94 is driven to advance the cutting blade 92 so as to close the other side opening of the core wire insertion recess 76. Then, the exposed core wire 15 is sheared between the distal end portion of the cutting blade 92 and the other side opening edge portion of the core wire insertion recess 76. As a result, the exposed core wire 15 is trimmed to a length dimension necessary for crimping the core wire crimping portion 24 (see FIG. 4). Thereafter, the cutting blade 92 moves in the direction of retreating from the other side opening of the core wire insertion recess 76 by driving the blade driving portion 94. Further, the exposed core wire 15 is retracted from the core wire cutting device 70 by the wire feeding device 60 and then moved to a position facing the terminal crimping device 50.

  Next, the wire feeder 60 advances the exposed core wire 15 toward the terminal crimping device 50 (see FIG. 5). Then, the terminal crimping device 50 crimps the terminal 20 to the exposed core wire 15 (see FIG. 1). Thereafter, the wire feeder 60 retracts the electric wire 12 from the terminal crimping device 50, and carries out the manufactured electric wire 10 with a terminal to the outside.

  According to the core wire cutting device 70 configured as described above, the end surface of the insulating coating 18 facing the proximal end portion of the exposed core wire 15 protrudes from the core wire insertion recess 76 in a state where the end surface is in contact with the positioning opening edge portion 78. The end portion of the exposed core wire 15 can be cut, and the exposed core wire 15 can be easily trimmed to a certain length. Moreover, the terminal 20 can be crimped | bonded, suppressing the protrusion of an aluminum strand by crimping | bonding the terminal 20 to the exposed core wire 15 cut and aligned in this way.

  Further, since the guide surface 80 is formed so as to sequentially expand outward from one side opening of the core wire insertion recess 76, the exposed core wire 15 can be smoothly guided toward the core wire insertion recess 76.

  Moreover, since the length of the several core wire insertion recessed part 76 is changed and the position of the several positioning opening edge part 78 from a cutting position is changed, the positioning member 72 is rotated and the several core wire insertion recessed part 76 and positioning are carried out. By selectively disposing the opening edge portion 78 at a position corresponding to the cutting portion 90, the cutting length of the exposed core wire 15 can be easily changed by a simple configuration using one cutting portion 90.

  Further, since the exposed core wire 15 is sheared between the cutting blade 92 and the other opening edge of the core wire insertion recess 76, the exposed core wire 15 can be cut with a relatively simple configuration.

{Modifications}
In the above-described embodiment, it has been described that the core wire insertion recess 76 has a round hole shape, but this is not necessarily required. For example, a square hole shape may be used.

  10 and 11 show a core wire insertion recess 176 according to a modification. The other side opening of the core wire insertion recess 76 is shown on the left side of FIG. 10, and the cross section of the peripheral portion of the core wire insertion recess 76 is shown on the right side. The core wire insertion recess 176 is formed in a hole shape that has a flat surface 176a on one side and an arcuate curved surface 176b on the opposite side. In other words, the core wire insertion recess 176 is formed in a substantially D-shaped hole. The flat surface 176a is provided on the advancing direction side (here, the lower side) in which the cutting blade 92 moves during cutting.

  In this case, the cutting blade 92 shears the exposed core wire 15 between the flat opening 176 a and the corresponding linear edge portion of the other opening edge portion of the core wire insertion recess 176. For this reason, the exposed core wire 15 can be smoothly cut between the linear edge portions.

  Further, since the core wire insertion recess 176 has an arcuate curved surface on the opposite side of the flat surface 176a, the exposed core wire 15 is not easily caught by the opening edge when inserted into the core wire insertion recess 176, and the exposed core wire 15 is smoothly inserted into the core wire. The concave portion 176 can be inserted and guided.

  In this case, the guide surface 180 may have a shape corresponding to the core wire insertion recess 176, that is, a shape that gradually expands outward from one side opening of the core wire insertion recess 176 while maintaining a substantially D-shape.

  Moreover, although the said embodiment and the modification demonstrated that the exposed core wire 15 was sheared between the cutting blade 92 and the other side opening edge part of the core wire insertion recessed parts 76 and 176, it is not necessarily required.

  FIG. 12 shows a cutting unit 190 according to a modification. The cutting unit 190 has a pair of cutting blades 192. The pair of cutting blades 192 is provided at a position spaced a predetermined distance from the positioning opening edge portion 78 toward the distal end side of the exposed core wire 15, and can be driven toward and away from the blade driving portion 194. Then, by inserting the exposed core wire 15 into the core wire insertion recess 76 and causing the distal end portion to protrude from the other side opening of the core wire insertion recess 76, the pair of cutting blades 192 are moved closer to each other, so that both cutting blades The tip of the exposed core wire 15 is sheared between 192. In this case, the distance between the cutting position by the two cutting blades 192 and the positioning opening edge portion 78 is set to a dimension corresponding to the length dimension necessary for crimping the core wire crimping portion 24 to the exposed core wire 15.

  In this case, since the exposed core wire 15 is sheared by the close movement of the pair of cutting blades 192, the exposed core wire 15 can be cut more reliably.

  In the present embodiment, the electric wire 12 is held by the electric wire feeder 60 and the exposed core wire 15 is inserted. However, the exposed core wire 15 may be inserted manually by an operator or the like.

  In the embodiment, the plurality of core wire insertion recesses 76 are switched by rotating the positioning member 72, but this is not necessarily required. For example, a plurality of core wire insertion recesses may be formed in an elongated plate-like member, and the core wire insertion recesses may be switched by moving the plate-like member. Moreover, it is not essential that there are a plurality of core wire insertion recesses.

  In this embodiment, the positioning plate 74 is flush with the cutting portion 90, but this is not always necessary. Depending on the change in the length dimension of the core wire insertion recess 76, the cut portion 90 side portion of the positioning plate 74 may have an uneven shape. In this case, the cutting blade 92 may be configured to be movable along the axial direction of the core wire insertion recess 76 in accordance with the uneven shape.

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

DESCRIPTION OF SYMBOLS 10 Electric wire with a terminal 12 Electric wire 14 Core wire 15 Exposed core wire 18 Insulation coating 20 Terminal 24 Core wire crimping part 70 Core wire cutting device 72 Positioning member 76 Core wire insertion recessed part 78 Positioning opening edge part 80, 180 Guide surface 82 Rotation drive part 90, 190 Cutting part 92, 192 Cutting blade 94 Blade drive unit 176 Core wire insertion recess 176a Flat surface 176b Arc-shaped curved surface

Claims (7)

A method of manufacturing a terminal-attached electric wire comprising: an electric wire having a core wire in which a plurality of aluminum strands are gathered; an insulating coating covering an outer periphery of the core wire; and a terminal crimped to an exposed core wire at an end of the electric wire. And
(a) applying pressure to the exposed core wire to join the aluminum strands together;
(b) a step of trimming the end portions of the exposed core wires joined to each other;
(c) a step of crimping a terminal to the exposed core wire whose ends are trimmed, and
The manufacturing method of the electric wire with a terminal provided with. An electric wire having a core wire in which a plurality of aluminum wires are assembled and an insulating coating covering the outer periphery of the core wire;
A terminal crimped to the exposed core wire at the end of the electric wire,
Pressure is applied to the exposed core wire to join the aluminum strands together, and ends of the exposed core wire are trimmed,
The electric wire with a terminal, wherein the terminal is crimped to the exposed core wire whose end is aligned. A core wire cutting device for cutting the exposed core wire at the end of the electric wire,
A core wire insertion concave portion into which the exposed core wire can be inserted with the end portion of the exposed core wire protruding is formed, and an insulating coating facing the base end portion of the exposed core wire is formed at one side opening of the core wire insertion concave portion. A positioning member formed with a positioning opening edge that contacts the end face and positions the exposed core along the axial direction;
A cutting portion provided at a position away from the positioning opening edge to the end side of the exposed core wire inserted into the core wire insertion recess, and capable of cutting the end portion of the exposed core wire protruding from the core wire insertion recess; ,
A core wire cutting device. The core wire cutting device according to claim 3, wherein
The positioning member is rotatably supported around a rotation axis, and a plurality of the core wire insertion recesses are formed at intervals along a virtual circle centered on the rotation axis,
The cutting portion is provided at a position separated from the rotation axis by a radial dimension of the virtual circle;
Positioning opening edge portions of the plurality of core wire insertion recesses are provided by changing the position from the cutting position by the cutting portion,
A core wire cutting device, wherein a plurality of the core wire insertion recesses are selectively disposed at positions corresponding to the cutting portions by rotation of the positioning member. The core wire cutting device according to claim 3 or 4,
The cutting portion has a cutting blade that can be in sliding contact with the positioning member at the other side opening of the core wire insertion recess, and the exposed core wire is disposed between the cutting blade and the other side opening edge of the core wire insertion recess. Shearing core wire cutting device. The core wire cutting device according to claim 5,
The said core wire insertion recessed part is a core wire cutting device currently formed in the hole shape which draws an arc-shaped curved surface in the direction side where the said cutting blade moves at the time of a cutting | disconnection, and the other side. The core wire cutting device according to claim 3 or 4,
The said cutting part is a core wire cutting device which has a pair of cutting blade which can cut | disconnect the edge part of the exposed core wire which protrudes from the said core wire insertion recessed part.

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