JP2018073537A - Terminal crimping device and method for manufacturing electric wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal crimping device capable of improving a performance of a crimping terminal.SOLUTION: A terminal crimping device comprises: a first die 112 having a bottom wall 14, a first side wall 15 projecting from one end in a width direction of the bottom wall, and a second side wall 16 projecting from the other end in the width direction of the bottom wall and opposed to the first side wall in the width direction, and supporting the bottom wall of the crimping terminal 1; and plural second dies 113 nipping the crimping terminal between the first and second dies while an electric wire 50 is provided in a space part 12D surrounded by the bottom wall, the first side wall and the second side wall. The plural second dies have a first bending die 131 bending the first side wall toward the bottom wall and overlaid on the electric wire, a second bending die bending the second side wall and overlaid on an outside face of the first side wall, and a crimping die for pressurizing the first side wall and the second side wall toward the first die and being crimped to the electric wire.SELECTED DRAWING: Figure 15

Description

  The present invention relates to a terminal crimping device and a method of manufacturing a terminal-attached electric wire.

  Conventionally, there is a terminal crimping device that winds and crimps two side walls of a crimp terminal around an electric wire. For example, in the technique of the terminal crimping device disclosed in Patent Document 1, the curved portion of the crimper is pressed against the curved portion that presses one of the barrels erected from both side edges of the substrate portion and the other barrel. By making the curvatures of the curved portions to be different, the two barrels reach the inner upper part of the crimper and a step is formed at the overlapping part. The level difference is larger than the sum of the thickness of the barrel and the thickness of the sealing material applied to the barrel.

  According to the technology of the terminal crimping device of Patent Document 1, the level difference is larger than the sum of the thickness of the barrel and the thickness of the sealing material applied to the barrel, so that the sealing material applied to the barrel is It is said that there is no fear of being scraped off at the tip of the other barrel.

JP 2014-182953 A

  There is still room for improvement in improving the performance of crimp terminals. For example, in the crimping step, when the bending of the side wall portion and the crimping of the side wall portion with respect to the electric wire are performed by the same mold, it is not easy to make the two functions compatible at a high level in one mold. It is desirable that the performance of the crimp terminal can be improved by suppressing interference between the two side wall portions during bending.

  The objective of this invention is providing the manufacturing method of the terminal crimping apparatus and the electric wire with a terminal which can improve the performance of a crimp terminal.

  The terminal crimping device of the present invention has a bottom wall portion, a first side wall portion projecting from one end in the width direction of the bottom wall portion, a projecting portion from the other end in the width direction of the bottom wall portion, and the width A first mold for supporting the bottom wall portion of the crimp terminal having a second side wall portion facing the first side wall portion in the direction, the bottom wall portion, the first side wall portion, and the second side wall A plurality of second molds sandwiching the crimp terminal with the first mold in a state where an electric wire is installed in a space part surrounded by the parts, the plurality of second molds, A first bending mold for folding one side wall portion toward the bottom wall portion and overlapping the electric wire; and a second bending die for bending the second side wall portion and overlapping the outer surface of the first side wall portion; The first side wall portion and the second side wall portion thus stacked are pressed toward the first mold to be crimped to the electric wire. A crimping die that is characterized by having a.

  In the terminal crimping apparatus, the second bending mold has an opposing wall surface that faces the first mold and bends the second side wall portion and overlaps the outer side surface of the first side wall portion, When the first mold and the second bending mold are closest, a gap exceeding the thickness of the second side wall portion exists between the outer side surface of the first side wall portion and the opposing wall surface. It is preferable to do.

  The method of manufacturing a terminal-attached electric wire of the present invention protrudes from the bottom wall portion, the first side wall portion protruding from one end in the width direction of the bottom wall portion, and the other end in the width direction of the bottom wall portion, And the crimping terminal and electric wire which have the 2nd side wall part which counters the 1st side wall part in the width direction are inserted between the 1st metallic mold and the 1st bending mold, and the 1st side wall part is inserted. A first bending step of bending toward the bottom wall and overlapping the electric wire; and the second side wall by sandwiching the crimp terminal and the electric wire between the first mold and the second bending mold. A second bending step of bending the part and overlapping the outer side surface of the first side wall part; and the first and second crimping terminals and the electric wire are sandwiched between the first mold and the crimping mold, and the first A pressing step for pressing the side wall portion and the second side wall portion toward the first mold and crimping to the electric wire. And wherein the Rukoto.

  The terminal crimping apparatus according to the present invention has a plurality of second molds for sandwiching the crimp terminals with the first mold. The plurality of second molds include a first bending mold that bends the first side wall portion toward the bottom wall portion and overlaps the electric wire, and a second that bends the second side wall portion and overlaps the outer side surface of the first side wall portion. And a crimping die that presses the stacked first and second side wall portions toward the first die and crimps them to the electric wire.

  According to the terminal crimping apparatus according to the present invention, the bending of the first side wall part, the bending of the second side wall part, and the crimping of the first side wall part and the electric wire of the second side wall part are performed by separate molds. Therefore, the terminal crimping apparatus according to the present invention has an effect that the performance of the crimp terminal can be improved by suppressing interference between the side walls at the time of bending and improving the crimp strength.

Drawing 1 is a perspective view showing the state before crimping of the crimp terminal concerning an embodiment. FIG. 2 is a side view showing a state before crimping of the crimp terminal according to the embodiment. FIG. 3 is a perspective view illustrating the crimp terminal according to the embodiment after crimping. FIG. 4 is a side view showing the crimp terminal according to the embodiment after crimping. FIG. 5 is a perspective view showing a state before the electric wire connecting portion is bent in the crimp terminal according to the embodiment. FIG. 6 is a plan view showing a state in which a water stop member is affixed to the crimp terminal according to the embodiment. FIG. 7 is a plan view showing the terminal chain of the embodiment. FIG. 8 is a side view of the terminal crimping apparatus according to the embodiment. FIG. 9 is a front view of the terminal crimping apparatus according to the embodiment. FIG. 10 is a perspective view showing first and second molds according to the embodiment. FIG. 11 is a side view showing the terminal cut body according to the embodiment. FIG. 12 is a rear view illustrating the terminal cut body according to the embodiment. Drawing 13 is a sectional view showing the state where an electric wire and a crimp terminal were set in a terminal crimping device of an embodiment. FIG. 14 is a cross-sectional view of the first bending mold according to the embodiment. FIG. 15 is a cross-sectional view illustrating a state in which the first bending mold according to the embodiment bends the first barrel piece. FIG. 16 is a cross-sectional view showing the time when the first bending process according to the embodiment is completed. FIG. 17 is another cross-sectional view showing the time of completion of the first bending process according to the embodiment. FIG. 18 is a cross-sectional view of a second bending mold according to the embodiment. FIG. 19 is a cross-sectional view illustrating a state in which the second bending mold according to the embodiment bends the second barrel piece. FIG. 20 is a cross-sectional view showing the time when the second bending step according to the embodiment is completed. FIG. 21 is another cross-sectional view showing the time of completion of the second bending process according to the embodiment. FIG. 22 is a cross-sectional view of the crimping die according to the embodiment. FIG. 23 is a cross-sectional view showing the time when the pressing step according to the embodiment is completed. FIG. 24 is another cross-sectional view showing when the pressing step according to the embodiment is completed.

  Below, it demonstrates in detail, referring drawings for the manufacturing method of the terminal crimping apparatus and electric wire with a terminal which concern on embodiment of this invention. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

[Embodiment]
The embodiment will be described with reference to FIGS. 1 to 24. The present embodiment relates to a terminal crimping apparatus and a method of manufacturing a terminal-attached electric wire. FIG. 13 shows a cross section taken along line XIII-XIII in FIG. FIG. 14 shows a cross section XIV-XIV in FIG. 15 and 16 are sectional views at the same sectional position as FIG. FIG. 17 shows a cross section XVII-XVII of FIG. FIG. 18 shows a cross section XVIII-XVIII of FIG. 19 and 20 show cross-sectional views at the same cross-sectional position as FIG. FIG. 21 shows the XXI-XXI cross section of FIG. FIG. 22 shows a XXII-XXII cross section of FIG. FIG. 23 shows a cross-sectional view at the same cross-sectional position as FIG. FIG. 24 shows a XXIV-XXIV cross section of FIG.

  First, the crimp terminal 1 according to the present embodiment will be described. The crimp terminal 1 shown in FIG. 1 and the like is a terminal that is crimped to the electric wire 50. The crimp terminal 1 is electrically connected to a mating terminal (not shown) in a state of being integrated with the electric wire 50. In the wire 50 to be crimped, the covering 52 at the end is removed and the core wire 51 is exposed for a predetermined length. The core wire 51 may be an assembly of a plurality of strands or a single wire such as a coaxial cable. The crimp terminal 1 is electrically connected to the exposed core wire 51 by being crimped to the end of the electric wire 50.

  The crimp terminal 1 includes a terminal fitting 10 and a water stop member 20. The terminal fitting 10 is a main part of the crimp terminal 1. The terminal fitting 10 is formed from a conductive metal plate (for example, a copper plate or a copper alloy plate) as a base material. The terminal fitting 10 is formed in a predetermined shape that can be connected to the mating terminal and the electric wire 50 by punching or bending the base material. The terminal fitting 10 has a terminal connection portion 11 and a wire connection portion 12. The terminal connection part 11 is a part electrically connected with the other party terminal. The wire connection portion 12 is a portion that is crimped to the wire 50 and is electrically connected to the core wire 51. A connecting portion 13 is provided between the terminal connecting portion 11 and the wire connecting portion 12. In other words, the terminal connection part 11 and the wire connection part 12 are connected via the connection part 13. The connecting portion 13 has side walls 13 a and 13 a that connect the side walls 11 a and 11 a of the terminal connecting portion 11 and the barrel pieces 15 and 16 that are the side walls of the wire connecting portion 12. One side wall 13 a connects one side wall 11 a and the first barrel piece 15, and the other side wall 13 a connects the other side wall 11 a and the second barrel piece 16. The height of the side wall 13a is lower than the height of the barrel pieces 15 and 16 and the side wall 11a. More specifically, the height of the side wall 13a decreases as it goes from the terminal connection portion 11 to the wire connection portion 12.

  The terminal fitting 10 may be a male terminal or a female terminal. The terminal connection portion 11 is molded into a male shape when the terminal fitting 10 is a male terminal, and is molded into a female shape when the terminal fitting 10 is a female terminal.

  In the description of the crimp terminal 1, the connection direction with the counterpart terminal, that is, the insertion direction with the counterpart terminal is referred to as a first direction L. The first direction L is the longitudinal direction of the crimp terminal 1. The parallel arrangement direction of the crimp terminals 1 is referred to as a second direction W. The parallel arrangement direction is a direction in which the crimp terminals 1 are arranged in parallel in the terminal chain 30 as described later, and is the width direction of the crimp terminals 1. In the crimp terminal 1, a direction orthogonal to both the first direction L and the second direction W is referred to as a third direction H. The third direction H is the height direction of the crimp terminal 1.

  In the molding process, the crimp terminal 1 is molded into a flat plate shape, and from this state, in the terminal connection part molding process, the terminal connection part 11 is formed in a cylindrical shape as shown in FIG. In the terminal connection portion forming step, the terminal connection portion 11 is bent. The terminal connection part 11 of this embodiment is formed in a cylindrical shape having a rectangular cross section. The electric wire connection part 12 is shape | molded so that a cross-sectional shape may become U shape in an electric wire connection part shaping | molding process. In the electric wire connection part forming step, the electric wire connection part 12 is bent. Moreover, the water stop member 20 is affixed to the electric wire connection part 12 in an affixing process. The pasting step may be executed before the wire connection portion forming step or after the wire connection portion forming step.

  As shown in FIGS. 1 and 6, the electric wire connecting portion 12 has a bottom portion 14, a first barrel piece portion 15, and a second barrel piece portion 16. The bottom part 14 is a part that becomes the bottom wall of the wire connection part 12 formed in a U shape. An end portion of the electric wire 50 is placed on the bottom portion 14 during the crimping process. The 1st barrel piece part 15 and the 2nd barrel piece part 16 are the site | parts used as the side wall of the electric wire connection part 12 formed in the U shape. The first barrel piece 15 and the second barrel piece 16 are connected to the end of the bottom portion 14 in the second direction W. The first barrel piece 15 and the second barrel piece 16 protrude from the end of the bottom portion 14 in the width direction in a direction intersecting the width direction. In the wire connection portion 12 formed in a U shape, when the end portion of the electric wire 50 is placed on the bottom portion 14, the first barrel piece portion 15 and the second barrel piece portion 16 are electrically connected from both sides in the second direction W. Surround 50.

  The first barrel piece 15 and the second barrel piece 16 may have the same length from the base on the bottom 14 side to the end surfaces of the tip portions 15a and 16a, and one length is longer than the other length. May be. In the crimp terminal 1 of this embodiment, the length from the root to the tip portion 16a in the second barrel piece 16 is longer than the length from the root to the tip portion 15a in the first barrel piece portion 15. For example, the first barrel piece 15 and the second barrel piece 16 are wound around the electric wire 50 while overlapping each other. In the present embodiment, the second barrel piece 16 overlaps the outside of the first barrel piece 15. The first barrel piece 15 and the second barrel piece 16 may be crimped so-called B-crimps. In the B crimp, each of the first barrel piece 15 and the second barrel piece 16 is bent toward the bottom portion 14 and crimped so that the tip portions 15 a and 16 a are pressed toward the electric wire 50. The crimp terminal 1 of the present embodiment is provided with a water stop member 20 to be described later, so the former caulking process is employed.

  The end portion of the electric wire 50 is inserted into the U-shaped inner space from the U-shaped opening of the electric wire connecting portion 12, that is, the gap between the tip portions 15a and 16a. The wire connection portion 12 is formed so that the end of the wire 50 can be easily inserted. Specifically, as for the electric wire connection part 12, the space | interval of the 2nd direction W of the 1st barrel piece part 15 and the 2nd barrel piece part 16 is expanding as it goes to the end surface of the front-end | tip parts 15a and 16a from the bottom part 14 side. .

  As shown in FIGS. 2 to 6, the first barrel piece 15 and the second barrel piece 16 have a connection crimping part 12 </ b> C interposed between the core crimping part 12 </ b> A and the covering crimping part 12 </ b> B. Each of the first barrel piece 15 and the second barrel piece 16 is a single piece in which the crimping parts 12A, 12C, and 12B are continuous along the first direction L in this order.

  The core wire crimping portion 12 </ b> A is a portion that is crimped to the core wire 51 at the tip of the electric wire 50. 12 A of core wire crimping | compression-bonding parts are the parts near the connection part 13 in each barrel piece part 15 and 16. FIG. The coated crimping part 12 </ b> B is a part that is crimped to the end of the coating 52. The covering crimping part 12B is a part located on the side farthest from the connecting part 13 side in each barrel piece part 15,16. 12 C of connection crimping | compression-bonding parts are site | parts which connect 12 A of core wire crimping parts, and the covering crimping | compression-bonding part 12B. 12 C of connection crimping parts are crimped | bonded with respect to the boundary part of the core wire 51 and the coating | coated 52 in the electric wire 50. FIG. The electric wire connection part 12 integrally covers the core wire 51 and the covering 52 by being crimped to the electric wire 50.

  As shown in FIGS. 5 and 6, a serration region 17 is provided on the inner wall surface of the electric wire connecting portion 12, that is, the wall surface on the side covering the electric wire 50. The serration region 17 is a core wire holding region that holds the core wire 51. The serration region 17 is a region including a portion wound around the core wire 51 on the inner wall surface of the electric wire connection portion 12. In the serration region 17, a plurality of recesses, a plurality of projections, or a combination of recesses and projections is arranged. A recessed part or a convex part increases the contact area of the electric wire connection part 12 and the core wire 51, and raises the adhesive strength of both. The serration region 17 of the present embodiment is a rectangular region, and a plurality of recesses 17a are formed at different positions in the first direction L.

  Here, it is not preferable that water permeates between the core wire 51 and the wire connecting portion 12 crimped to the core wire 51. For example, when the metal material of the core wire 51 and the metal material of the wire connection part 12 are different in the magnitude of the ionization tendency, there is a possibility of corrosion. As an example, when the material of the core wire 51 is aluminum and the material of the wire connection portion 12 is copper, the core wire 51 may be corroded. The crimp terminal 1 of the present embodiment is provided with a water stop member 20. The water stop member 20 suppresses the intrusion of water between the electric wire connecting portion 12 and the core wire 51.

  The water stop member 20 is a member formed in a sheet shape mainly including an adhesive such as an acrylic adhesive. As the water stop member 20 of this embodiment, a pressure-sensitive adhesive sheet formed by soaking a sheet-like nonwoven fabric with a pressure-sensitive adhesive and having a pressure-sensitive adhesive effect on both sides is used.

  The water stop member 20 is affixed, for example with respect to the inner wall surface of the flat wire connection part 12 shown in FIG. As shown in FIG. 6, the water stop member 20 is formed in a predetermined shape and includes a first water stop portion 21, a second water stop portion 22, and a third water stop portion 23. The first water stop portion 21 stops the portion where the first barrel piece portion 15 and the second barrel piece portion 16 overlap after completion of the pressure bonding. That is, the first water stop portion 21 is sandwiched between the first barrel piece portion 15 and the second barrel piece portion 16 that overlap each other to form a water stop region between the barrel piece portions 15 and 16. The first water stop portion 21 of the present embodiment is disposed in the second barrel piece portion 16 and extends along the first direction L.

  The second water stop portion 22 stops the terminal connection portion 11 from the tip of the core wire 51. The second water stop portion 22 is disposed at the end portion of the electric wire connection portion 12 on the terminal connection portion 11 side, and extends along the second direction W. It is desirable that at least a part of the second water stop portion 22 is provided in a region where the core wire 51 is placed. The 2nd water stop part 22 forms a water stop area | region in the clearance gap between the barrel piece parts 15 and 16 by being pinched | interposed between the overlapping barrel piece parts 15 and 16, for example. The 2nd water stop part 22 can also block the clearance gap by the side of the terminal connection part 11 rather than the front-end | tip of the core wire 51 by mutually overlapping in a crimping | compression-bonding process. The second water stop portion 22 suppresses water immersion from the terminal connection portion 11 side between the wire connection portion 12 and the core wire 51.

  The third water stop portion 23 suppresses the intrusion of water from the gap between the wire connecting portion 12 and the covering 52. The third water stop portion 23 is disposed at the end of the electric wire connection portion 12 opposite to the terminal connection portion 11 side, and extends along the second direction W. The third water stop portion 23 is sandwiched between the sheath 52 and the wire connection portion 12, thereby forming a water stop region between the sheath 52 and the wire connection portion 12.

  The terminal fitting 10 shown above is processed into a form having a flat wire connecting portion 12 shown in FIG. 5 through a pressing process for a single metal plate as a base material. In the subsequent attaching step, the water stop member 20 is attached to the flat wire connecting portion 12. Thereafter, the terminal fitting 10 is formed with the terminal connection portion 11 and the U-shaped wire connection portion 12 in the bending step.

  In the present embodiment, the terminal chain 30 shown in FIG. 7 is formed by a pressing process or a bending process. The terminal chain 30 is a chain of a plurality of crimp terminals 1 and is formed from a single metal plate. A terminal chain 30 is supplied to the terminal crimping device 100. The terminal crimping apparatus 100 performs a crimping process and a terminal cutting process on the terminal chain 30. The crimping process is a process of crimping the crimp terminal 1 of the terminal chain 30 by crimping the crimp terminal 1 to the electric wire 50. The terminal cutting step is a step of cutting the crimp terminal 1 crimped to the electric wire 50 from the terminal chain 30.

  The terminal chain 30 is an assembly of the crimp terminals 1. The terminal chain 30 includes a connecting piece 31, a plurality of crimp terminals 1, and a plurality of connecting portions 32. The connection piece 31, the crimp terminal 1, and the connection part 32 are formed from the same base material, and are integral. In the terminal chain 30, the crimp terminals 1 face the same direction and are arranged in parallel at equal intervals. In the terminal chain 30, one end of each crimp terminal 1 is connected to each other by a connecting piece 31. The shape of the connecting piece 31 is, for example, a rectangular elongated plate. The connecting piece 31 extends along the second direction W. The wire connecting portion 12 is connected to the connecting piece 31 via the connecting portion 32. More specifically, the connecting portion 32 connects the end of the bottom portion 14 opposite to the terminal connecting portion 11 side to the connecting piece 31.

  A plurality of terminal feed holes 31 a are formed in the connecting piece 31. The terminal feed holes 31 a are arranged at equal intervals along the feed direction of the terminal chain 30. The terminal feed hole 31a is a through hole that penetrates the connecting piece 31 in the plate thickness direction. The crimping terminal 1 is positioned with respect to the crimping device 102 described later by the terminal feed hole 31a. The terminal chain 30 is set with respect to the terminal crimping device 100 in a state of being wound in a reel shape.

  As illustrated in FIG. 8, the terminal crimping device 100 includes a terminal supply device 101, a crimping device 102, and a driving device 103. The terminal crimping device 100 is a device called an applicator in this technical field. The terminal supply device 101 is a device that supplies the crimp terminal 1 to a predetermined crimp position. The crimping device 102 is a device that crimps the crimp terminal 1 to the electric wire 50 at a predetermined crimping position. The driving device 103 is a device that operates the terminal supply device 101 and the crimping device 102.

  The terminal supply device 101 sequentially pulls out the terminal chain 30 wound in a reel shape from the outer peripheral side. The terminal supply device 101 supplies the crimp terminal 1 of the pulled terminal chain 30 to the crimp position in order from the top side. When the leading crimp terminal 1 is crimped to the electric wire 50 and is disconnected from the connecting piece 31, the terminal supply device 101 supplies the crimp terminal 1 that is newly at the leading position to the crimping position. The terminal supply device 101 performs a supply operation every time the crimping process and the cutting process of one crimp terminal 1 are completed, and supplies the next crimp terminal 1 to the crimping position.

  The terminal supply device 101 includes a terminal feed member 101a and a power transmission mechanism 101b. The terminal feed member 101 a has a protrusion that is inserted into the terminal feed hole 31 a of the connecting piece 31. The terminal feed member 101a moves the terminal chain 30 in the feed direction in a state where the protrusion is inserted into the terminal feed hole 31a. The power transmission mechanism 101b operates the terminal feed member 101a in conjunction with a crimping operation (a vertical movement of a ram 114A or the like described later) by the crimping device 102. The terminal supply device 101 supplies the crimp terminal 1 to the crimping position by moving the terminal feeding member 101a in the vertical direction and the feeding direction in conjunction with the crimping operation of the crimping device 102.

  The crimping device 102 executes a crimping process for crimping the supplied crimping terminal 1 to the electric wire 50 and a cutting process for separating the crimping terminal 1 from the connecting piece 31. The crimping device 102 includes a crimping machine 110 and a terminal cutting mechanism 120.

  The crimping machine 110 is a device that crimps the crimp terminal 1 to the electric wire 50 by crimping the crimp terminal 1 to the end of the electric wire 50. The crimping machine 110 according to the present embodiment crimps the crimp terminal 1 to the electric wire by crimping the first barrel piece 15 and the second barrel piece 16 of the crimp terminal 1 around the core wire 51 and the covering 52 of the electric wire 50. Crimp to 50. The crimping machine 110 includes a frame 111, a first mold 112, a second mold 113, and a power transmission mechanism 114.

  The frame 111 includes a base 111A, an anvil support 111B, a transmission support 111C, and a support 111D. The base 111 </ b> A is a member that forms the base of the terminal crimping apparatus 100. 111 A of bases are fixed with respect to the mounting base in which the terminal crimping apparatus 100 is mounted. The anvil support 111B, the transmission support 111C, and the support 111D are fixed on the base 111A.

The transmission portion support 111C is disposed rearward (to the right of the drawing in FIG. 8) and above (upward in the drawing of FIG. 8) with respect to the anvil support 111B. More specifically, transmission unit support 111C has a standing portion 111C ₁ and ram support portion 111C _2. Standing portion 111C ₁ is disposed behind the anvil support 111B, it is erected toward the base 111A upward. Ram support portion 111C ₂ is held on top of the standing portion 111C _1. Ram support portion 111C ₂ is a supporting portion for supporting the ram 114A which will be described later. Ram support portion 111C ₂ is above the anvil support 111B, are disposed at predetermined intervals between the anvil support 111B. The support base 111 </ b> D is a base that supports the terminal connection portion 11 of the crimp terminal 1. The height position of the upper surface of the support base 111 </ b> D is substantially the same position as the height position of the upper surface of the first mold 112.

  The first mold 112 and the second mold 113 are paired. The 1st metal mold | die 112 and the 2nd metal mold | die 113 are arrange | positioned at intervals in the up-down direction. As shown in FIG. 10, the first metal mold 112 and the second metal mold 113 sandwich the crimp terminal 1 and the electric wire 50 so that the crimp terminal 1 is crimped to the electric wire 50. The first mold 112 is a mold that supports the crimp terminal 1 from below. The first mold 112 is formed with two lower molds, and has a first anvil 112A as a first lower mold and a second anvil 112B as a second lower mold. The first anvil 112A and the second anvil 112B are integrally molded, for example. The second mold 113 is disposed above the first mold 112. The second mold 113 is formed with two upper molds, and has a first crimper 113A as a first upper mold and a second crimper 113B as a second upper mold.

  The first crimper 113A is positioned so as to face the first anvil 112A in the vertical direction. The first anvil 112A and the first crimper 113A cause the core wire crimping portion 12A to be crimped. That is, the first anvil 112 </ b> A and the first crimper 113 </ b> A are wound with the U-shaped core wire crimping portion 12 </ b> A around the core wire 51 of the electric wire 50 by crimping the core wire 51.

  The second crimper 113B is positioned so as to face the second anvil 112B in the vertical direction. The second anvil 112B and the second crimper 113B cause the coated crimping part 12B to be crimped. That is, the second anvil 112 </ b> B and the second crimper 113 </ b> B are wound with the U-shaped covering crimping part 12 </ b> B around the covering 52 and are crimped to the covering 52 by narrowing the interval between them.

  The driving device 103 transmits power to the power transmission mechanism 114 to narrow the distance between the first mold 112 and the second mold 113 in the crimping process, and crimp the wire connecting portion 12 to the wire 50. On the other hand, when the crimping process is completed, the driving device 103 widens the distance between the first mold 112 and the second mold 113. In the crimping apparatus 102 according to the present embodiment, the distance between the pair of molds 112 and 113 is changed by moving the second mold 113 up and down relative to the first mold 112.

  In the first mold 112, the first anvil 112A and the second anvil 112B may be separated, and in the second mold 113, the first crimper 113A and the second crimper 113B may be separated. In this case, the drive device 103 and the power transmission mechanism 114 may be configured to vertically move the first crimper 113A and the second crimper 113B separately.

  The power transmission mechanism 114 transmits the power output from the driving device 103 to the first crimper 113A and the second crimper 113B. As shown in FIG. 8, the power transmission mechanism 114 has a ram 114A, a ram bolt 114B, and a shank 114C.

Ram 114A is a movable member which is vertically movably supported relative to the ram support portion 111C _2. A second mold 113 is held on the ram 114A. Therefore, first crimper 113A and second crimper 113B moves up and down with respect to the ram support portion 111C ₂ become ram 114A integrally. The shape of the ram 114A is, for example, a rectangular shape. A female thread portion (not shown) is formed in the ram 114A. The female screw portion is formed on the inner peripheral surface of a vertical hole formed from the inner side of the ram 114A toward the upper end surface.

The ram bolt 114B has a male screw portion (not shown), and this male screw portion is screwed into the female screw portion of the ram 114A. Thus, ram bolt 114B moves up and down with respect to the ram support portion 111C ₂ become ram 114A integrally. Also, ram bolt 114B has a bolt head 114B ₁ positioned above the male screw portion. The bolt head 114B ₁ is a female thread portion (not shown) is formed. Bolt female thread of the head 114B ₁ is formed on the inner peripheral surface of the vertical bore formed toward the upper end surface from the inside of the bolt head 114B _1.

Shank 114C is a cylindrical hollow member, having respective male threaded portion 114C ₁ and the connecting portion to an end portion (not shown). Male thread portion 114C ₁ of the shank 114C is formed on the lower side of the hollow member, it is screwed into the female screw portion of the bolt head 114B ₁ of the ram bolt 114B. Thus, the shank 114C moves up and down with respect to the ram support portion 111C ₂ become ram 114A and ram bolt 114B integrally. A connecting portion of the shank 114 </ b> C is connected to the driving device 103.

The drive device 103 includes a drive source (not shown) and a power conversion mechanism (not shown) that converts the drive force of the drive source into power in the vertical direction. The connecting portion of the shank 114C is coupled to the output shaft of the power conversion mechanism. Thus, the upper and lower first crimper 113A and second crimper 113B is the output of the drive unit 103 (the output of the power conversion mechanism), ram 114A, ram bolt 114B, and become shank 114C integral with respect to the ram support portion 111C ₂ Move. As a driving source of the driving device 103, an electric actuator such as an electric motor, a hydraulic actuator such as a hydraulic cylinder, a pneumatic actuator such as an air cylinder, and the like are applicable.

The relative position in the vertical direction of the first crimper 113A for the first anvil 112A, and the relative position with respect to the vertical direction of the second crimper 113B second anvil 112B, the female screw portion of the bolt head 114B ₁ and the male threaded portion of the shank 114C by adjusting the screwing amount of 114C _1, it can be varied. Nut 114D is screwed to a male screw portion 114C ₁ of the shank 114C above the ram bolt 114B. Thus, the nut 114D forms a function of a so-called lock nut with a female screw portion of the bolt head 114B _1. The nut 114D can be fixed to the relative position of the first crimper 113A and the second crimper 113B by being tightened to the ram bolt 114B side after the adjustment of the relative position is completed.

As shown in FIG. 10, in the first anvil 112A and the second anvil 112B, concave surfaces 112A ₁ and 112B _{1 that} are recessed downward are formed at the respective upper ends. Each concave surface 112A ₁ , 112B ₁ is formed so that the cross-sectional shape is an arc shape in accordance with the shape of each bottom portion 14 of the U-shaped core wire crimping portion 12A and the U-shaped covering crimping portion 12B. Yes. In this crimping machine 110, each of the concave surfaces 112A _1, 112B ₁ is crimped position. Crimp terminal 1 for the bottom 14 have been supplied in the bottom, the bottom 14 of the core wire crimping portion 12A is placed on the concave surface 112A ₁ of the first anvil 112A, bottom 14 of the insulation crimp portion 12B is a second anvil 112B It is placed on the concave surface 112B _1. The first mold 112 is supported by the anvil support 111B with the concave surfaces 112A ₁ and 112B ₁ exposed upward.

As shown in FIG. 10, the first crimper 113A and the second crimper 113B are respectively formed with concave portions 113A ₁ and 113B _{1 that} are recessed upward. Each recess 113A _1, 113B ₁ are disposed opposite in the vertical direction with respect to each of the concave surfaces 112A _1, 112B ₁ of the first anvil 112A and second anvil 112B. Each concave portion 113A ₁ , 113B ₁ has first and second wall surfaces 115, 116 and a third wall surface 117. The first wall surface 115 and the second wall surface 116 face each other in the second direction W. The third wall surface 117 connects the upper ends of the first and second wall surfaces 115 and 116. Each concave portion 113A ₁ , 113B ₁ has the first barrel piece portion 15 and the second barrel portion 15 and the second barrel piece portion 15 in contact with the first to third wall surfaces 115, 116, 117 in contact with the first barrel piece portion 15 and the second barrel piece portion 16. The barrel piece 16 is crimped while being wound around the end of the electric wire 50. Each recess 113A _1, 113B ₁ is formed to allow such crimping operation.

  The crimping terminal 1 crimped by the crimping machine 110 is separated from the connection piece 31 by the terminal cutting mechanism 120. The terminal cutting mechanism 120 is configured to sandwich and cut the connecting portion 32 of the crimping terminal 1 supplied to the crimping position between the two terminal cutting portions, and performs the disconnection in conjunction with the progress of the crimping process. As shown in FIG. 8, the terminal cutting mechanism 120 is disposed on the front side (the left side in FIG. 8) of the second anvil 112B. The terminal cutting mechanism 120 includes a terminal cutting body 121, a pressing member 122, and an elastic member 123.

  The terminal cut body 121 is formed in a rectangular shape, and is arranged so as to be slidable in the vertical direction along the front surface of the second anvil 112B. As shown in FIGS. 11 and 12, a slit 121b is formed in the terminal cutting body 121 from the sliding contact surface 121a to the second anvil 112B inward. The slit 121 b is a passage of the connecting piece 31 of the terminal chain 30. When the crimping terminal 1 to be crimped has been supplied to the crimping position, a part of the connecting portion 32 connected to the crimping terminal 1 protrudes from the slit 121b. The crimp terminal 1 supplied to the crimp position is supported from below by the first mold 112.

  The terminal cutting body 121 cuts the connecting portion 32 while moving up and down relatively with respect to the first mold 112 and the crimp terminal 1. Here, a position where the connecting piece 31 or the like can be inserted into the slit 121b is an initial position in the vertical direction of the terminal cutting body 121. As shown in FIG. 13, the end of the connecting portion 32 on the side of the wire connecting portion 12 protrudes from the slit 121b through the opening on the sliding contact surface 121a side (that is, the crimp terminal 1 side) of the slit 121b. In the terminal cut body 121, an upper edge portion (hereinafter referred to as “open edge”) 121 c in the opening is used as one terminal cutting portion. The other terminal cutting part is the upper surface edge 112a of the second anvil 112B.

  The pressing member 122 is fixed to the ram 114A and moves up and down integrally with the ram 114A. The pressing member 122 is disposed above the terminal cut body 121 and descends to push down the terminal cut body 121. The pressing member 122 is formed in a rectangular shape. The elastic member 123 applies an upward biasing force to the terminal cut body 121, and is made of a spring member or the like. When the pressing force from the pressing member 122 is released, the elastic member 123 returns the terminal cutting body 121 to the initial position in the vertical direction.

  In the terminal cutting mechanism 120, the pressing member 122 is lowered with the lowering of the second mold 113 during the crimping process, and the terminal cutting body 121 is pushed down. When the terminal cutting body 121 descends, the connecting portion 32 is sandwiched between the opening edge 121c of the slit 121b and the upper surface edge 112a (FIG. 13) of the second anvil 112B. In the terminal cutting mechanism 120, the opening edge 121c and the upper surface edge 112a act like a heel and apply a shearing force to the connecting portion 32. When the terminal cutting body 121 is further pushed down, the opening edge 121 c and the upper surface edge 112 a cut the connecting portion 32, and the crimp terminal 1 is separated from the connecting piece 31. In order to improve cutting performance, the opening edge 121c is inclined with respect to the upper surface edge 112a on the sliding contact surface 121a.

  As illustrated in FIG. 13, the electric wire 50 to be crimped is disposed at a predetermined position between the terminal cut body 121 and the pressing member 122. Specifically, the electric wire 50 is placed on the upper surface 121 d of the terminal cut body 121. For this reason, at least one of the upper part of the terminal cutting body 121 and the lower part of the pressing member 122 is provided with a space for escaping the electric wire 50 so that the electric wire 50 is not crushed therebetween.

  Here, the predetermined position is a position where the end portion of the electric wire 50 before the crimping process is present above the bottom portion 14 of the flat wire connecting portion 12. Further, the predetermined position can be placed on the bottom portion 14 of the core wire crimping portion 12A so that the tip of the core wire 51 pushed down at the start of the crimping process does not protrude from the core wire crimping portion 12A. It is a position. The core wire 51 may extend in the axial direction along with the crimping process, and the tip position of the core wire 51 may move along the axial direction. Desirably, the predetermined position is determined in consideration of the elongation.

  On the other hand, the end of the electric wire 50 (the core wire 51 and the covering 52 at the tip) is pushed down to the inner wall surface side of the electric wire connecting portion 12 by the second mold 113. For this reason, if it is not held at all, the electric wire 50 is lifted from the upper surface 121d of the terminal cut body 121, and the core wire 51 and the covering 52 at the tip end are crimped without being placed on the bottom portion 14 of the electric wire connecting portion 12. There is a fear. For this reason, in the terminal crimping apparatus 100 of this embodiment, the electric wire 50 is hold | maintained in a predetermined position between the upper part of the terminal cutting body 121, and the position of the edge part of the electric wire 50 with respect to the electric wire connection part 12 in a crimping process An electric wire holding mechanism that suppresses the deviation is provided.

  The electric wire holding mechanism includes an electric wire presser 118 that presses and holds the electric wire 50 placed on the upper surface 121d of the terminal cut body 121 as the electric wire placing portion toward the upper surface 121d (FIG. 13). The wire retainer 118 is disposed above the terminal cut body 121 and between the second mold 113 and the pressing member 122. Between the upper surface 121d of the terminal cutting body 121 and the lower surface of the wire retainer 118, a space (hereinafter referred to as “wire holding space”) 118A for holding the covering 52 of the wire 50 is formed. The electric wire holding space 118 </ b> A suppresses the lifting of the electric wire 50 from the upper surface 121 d of the terminal cut body 121 in the crimping process, and suppresses the positional deviation of the core wire 51 and the covering 52 at the tip with respect to the electric wire connecting portion 12. The wire retainer 118 can move up and down with respect to the upper surface 121 d of the terminal cut body 121, and forms a wire holding space 118 </ b> A with the upper portion of the terminal cut body 121 by descending. For example, the wire retainer 118 is fixed to the ram 114A and moves up and down integrally with the ram 114A. The electric wire 50 is held in the electric wire holding space 118 </ b> A formed with the lowering of the electric wire presser 118.

  Here, the second mold 113 of the present embodiment includes a first bending mold 131 shown in FIG. 14, a second bending mold 132 shown in FIG. 18, and a crimping mold 133 shown in FIG. Have. As will be described below, the terminal crimping apparatus 100 according to the present embodiment uses three molds 131, 132, and 133 to crimp the crimp terminal 1 to the electric wire 50 in three stages. The terminal crimping device 100 improves the performance of the crimp terminal 1 by crimping the crimp terminal 1 in three stages. The terminal crimping apparatus 100 is a position where any one of the three molds 131, 132, 133 faces the first mold 112 in the third direction H (hereinafter, simply referred to as “opposing position”). The switching mechanism is positioned at the position. The switching mechanism positions any one of the three molds 131, 132, and 133 at the facing position, and positions the other two molds at positions different from the facing position, that is, the first mold 112 and the pressure bonding. Retreat to a position where it does not interfere with the terminal 1. For example, the switching mechanism moves the three molds 131, 132, and 133 by the driving force of the driving device 103. The switching mechanism switches, for example, a mold that faces the first mold 112 by rotating or moving the three molds 131, 132, 133 in parallel.

A first bending mold 131 shown in FIG. 14 is one of three molds constituting the second mold 113. As will be described later with reference to FIG. 15 and FIG. 16, the first bending die 131 bends the first barrel piece 15 toward the bottom portion 14 and overlaps the electric wire 50. As shown in FIG. 14, the first bending mold 131 has concave portions 113 </ b> A ₁ and 113 </ b> B ₁ . The concave portions 113 </ b> A ₁ and 113 </ b> B ₁ are concave portions provided on the lower surface of the first bending mold 131. The first bending die 131 has a first wall surface 115, a second wall surface 116, and a third wall surface 117 that constitute the concave portions 113A ₁ and 113B ₁ . The cross-sectional shape illustrated in FIG. 14 is a shape of the concave portion 113A _1, is similar to this is also the cross-sectional shape of the concave portion 113B _1.

The first wall surface 115 and the second wall surface 116 face each other in the second direction W. The third wall surface 117 connects the upper end of the first wall surface 115 and the upper end of the second wall surface 116. The third wall surface 117 is mainly composed of a curved portion 117R. The curved shape of the curved portion 117R is a shape that is recessed toward the back side of the concave portions 113A ₁ and 113B ₁ , that is, upward. The curved portion 117R of the present embodiment is curved so that the cross-sectional shape of the cross section shown in FIG. 14 is an arc shape.

  The third wall surface 117 is provided with a groove 117A. As shown in FIG. 16, the groove 117A is a recess into which the second barrel piece 16 can enter. The depth direction of the groove 117A is the third direction H. The groove 117A is recessed upward. In other words, the groove 117 </ b> A is recessed toward the opposite side of the first mold 112 while facing the first mold 112. 117A of groove parts are extended along the direction orthogonal to the paper surface in FIGS. 117 A of groove parts are provided in the edge part by the side of the 2nd wall surface 116 in the 3rd wall surface 117. As shown in FIG. The width Wd1 of the groove 117A is larger than the plate thickness of the second barrel piece 16.

  As shown in FIG. 14, in the 3rd wall surface 117, the connection part with the 1st wall surface 115 and the connection part with the 2nd wall surface 116 become the inclination part 117D. The inclined portions 117D are inclined so as to approach each other in the second direction W as they go upward. The inclined portion 117D functions as a guide surface for guiding the first barrel piece 15 and the second barrel piece 16 to the curved portion 117R and the groove portion 117A.

  The terminal crimping apparatus 100 according to the present embodiment executes a crimping process for crimping the crimp terminal 1 to the electric wire 50. In the crimping process of the present embodiment, the first bending process, the second bending process, and the pressing process are executed in this order, and the electric wire with terminal shown in FIG. That is, the manufacturing method of the electric wire with a terminal of this embodiment has a 1st bending process, a 2nd bending process, and a press process.

(First bending process)
The first bending step is a step of bending the first barrel piece 15 with the first bending die 131. In the first bending step, the switching mechanism of the terminal crimping apparatus 100 positions the first bending die 131 at the facing position. The other two molds 132 and 133 are retracted from the facing positions by the switching mechanism. In the crimping step, as shown in FIG. 15, the electric wire 50 is installed in the space portion 12 </ b> D surrounded by the bottom portion 14, the first barrel piece portion 15, and the second barrel piece portion 16. With the electric wire 50 installed in the space portion 12D, the terminal crimping apparatus 100 lowers the first bending mold 131 as shown in FIG. The first bending die 131 selectively bends the first barrel piece 15 out of the two barrel pieces 15 and 16 of the electric wire connecting portion 12 placed on the first die 112.

  As the first bending die 131 descends, the curved portion 117R of the first bending die 131 comes into contact with the first barrel piece 15 as shown in FIG. The bending portion 117 </ b> R applies a force F <b> 1 toward the second barrel piece 16 and the bottom portion 14 to the first barrel piece 15. The force F1 bends the first barrel piece 15 toward the bottom 14 and the second barrel piece 16. This bending proceeds according to the curved shape of the bending portion 117R as the first bending mold 131 is lowered. The curved portion 117R bends the first barrel piece 15 toward the bottom portion 14 and deforms the first barrel piece 15 into a curved shape that curves toward the third wall surface 117 side. When the first bending die 131 reaches the bottom dead center, the first barrel piece 15 overlaps the electric wire 50 as shown in FIG. At this time, the first barrel piece 15 may be in contact with the electric wire 50 or slightly away from the electric wire 50. The terminal crimping apparatus 100 according to the present embodiment bends the first barrel piece 15 to contact the electric wire 50.

  Here, the bottom dead center of the first bending die 131 is a position closest to the first die 112 in the movable range of the first bending die 131 along the third direction H. The same applies to the bottom dead center of the second bending mold 132 and the bottom dead center of the pressure bonding mold 133. When the first bending die 131 is lowered to the bottom dead center, the terminal crimping apparatus 100 raises the first bending die 131 by reversing the moving direction of the first bending die 131.

  As the first bending die 131 descends, the second barrel piece 16 enters the groove 117A as shown in FIGS. The groove 117 </ b> A is recessed along the moving direction in which the first bending mold 131 moves relative to the first mold 112. Accordingly, the second barrel piece 16 enters the inner part of the groove 117A as the first bending die 131 descends. That is, 117 A of groove parts accommodate the 2nd barrel piece part 16 inside, when the 1st bending metal mold | die 131 approaches toward the 1st metal mold | die 112. FIG. The depth of the groove 117A is determined so that the tip of the second barrel piece 16 does not hit the bottom of the groove 117A when the first bending die 131 is at the bottom dead center.

  As shown in FIG. 16, when the first bending mold 131 is at the bottom dead center, the tip side portion of the second barrel piece 16 enters the groove 117 </ b> A. 117 A of groove parts support the 2nd barrel piece part 16, and suppress the change of the attitude | position of the electric wire connection part 12. FIG. The first bending die 131 can support the second barrel piece 16 from both sides in the second direction W by the wall surfaces 117B and 117C constituting the groove 117A. The wall surfaces 117B and 117C face each other in the second direction. The wall surfaces 117 </ b> B and 117 </ b> C may cause the second barrel piece 16 to move when the electric wire connecting portion 12 tries to rotate around the axis in the first direction L or shifts in the second direction W with respect to the first mold 112. Support and regulate these movements. Therefore, the change of the attitude | position of the electric wire connection part 12 is suppressed, and the stability of a crimping | compression-bonding process improves.

  As shown in FIG. 16, the first barrel piece 15 is bent so as not to contact the second barrel piece 16. The curved portion 117R bends the first barrel piece 15 so that a gap is left between the tip 15a of the first barrel piece 15 and the second barrel piece 16. The first bending die 131 of this embodiment bends the first barrel piece 15 without bringing the tip 15 a of the first barrel piece 15 into contact with the second barrel piece 16. Thereby, it is suppressed that the water stop member 20 affixed on the inner surface 16b of the second barrel piece 16 is scraped off by the first barrel piece 15.

(Second bending process)
The second bending step is a step of bending the second barrel piece 16 with the second bending mold 132. A second bending mold 132 shown in FIG. 18 is one of three molds constituting the second mold 113. As will be described later with reference to FIGS. 19 and 20, the second bending mold 132 bends the second barrel piece 16 and overlaps the outer surface 15 b of the first barrel piece 15. As shown in FIG. 18, the second bending mold 132 has concave portions 113A ₁ and 113B ₁ . The recessed portions 113 </ b> A ₁ and 113 </ b> B ₁ are recessed portions provided on the lower surface of the second bending mold 132. The second bending mold 132 has a first wall surface 115, a second wall surface 116, and a third wall surface 117 that constitute the concave portions 113A ₁ and 113B ₁ . The cross-sectional shape illustrated in FIG. 18 is a shape of the concave portion 113A _1, is similar to this is also the cross-sectional shape of the concave portion 113B _1.

  The first wall surface 115 and the second wall surface 116 face each other in the second direction W. The third wall surface 117 connects the upper end of the first wall surface 115 and the upper end of the second wall surface 116. The third wall surface 117 is mainly composed of an inclined portion 117S. The inclined portion 117S is inclined with respect to the second direction W. In the second bending step, the switching mechanism of the terminal crimping apparatus 100 positions the second bending mold 132 at the facing position. The other two molds 131 and 133 are retracted from the facing positions by the switching mechanism.

As shown in FIG. 19, the inclined portion 117 </ b> S is a facing wall surface that faces the first mold 112 when positioned at the facing position. The inclined portion 117S is provided in a region facing the first mold 112 in the third direction H. The inclined portion 117S of the present embodiment is provided corresponding to a range from one end to the other end in the second direction W in the concave surfaces 112A ₁ and 112B ₁ . The inclined portion 117S is inclined with respect to the second direction W so as to move away from the first mold 112 along the second direction W from the second barrel piece 16 side toward the first barrel piece 15 side. . In other words, the inclined portion 117 </ b> S is inclined so as to apply a force F <b> 2 in a direction to bend toward the first barrel piece portion 15 side with respect to the second barrel piece portion 16 when contacting the second barrel piece portion 16. .

  The terminal crimping apparatus 100 lowers the second bending mold 132 toward the first mold 112 in the second bending step. As the second bending mold 132 descends, the inclined portion 117S of the second bending mold 132 contacts the second barrel piece 16 as shown in FIG. The inclined portion 117 </ b> S applies a force F <b> 2 toward the outer side surface 15 b and the bottom portion 14 side of the first barrel piece portion 15 to the second barrel piece portion 16. The force F <b> 2 bends the second barrel piece 16 toward the bottom 14 and the outer surface 15 b of the first barrel piece 15. This bending proceeds according to the inclined shape of the inclined portion 117S as the second bending mold 132 is lowered. The inclined portion 117S inclines the second barrel piece 16 with respect to the second direction W while bending the second barrel piece 16 toward the outer surface 15b. When the second bending die 132 reaches the bottom dead center, the second barrel piece 16 overlaps the outer surface 15b of the first barrel piece 15 as shown in FIGS. At this time, the second barrel piece 16 may be in contact with the outer surface 15b or may be slightly separated from the outer surface 15b.

  In the terminal crimping apparatus 100 of the present embodiment, when the second bending mold 132 is at the bottom dead center, the second barrel piece is interposed between the outer surface 15b of the first barrel piece 15 and the inclined portion 117S. There is a gap exceeding the thickness t1 of the portion 16. The width L1 of the gap between the outer side surface 15b and the inclined portion 117S is larger than the thickness t1 of the second barrel piece 16. The second bending mold 132 is such that the value of the width L1 is larger than the thickness t1 of the second barrel piece 16 at the position where the gap width L1 is the smallest among the positions along the inclined portion 117S. Is formed.

  The second bending mold 132 formed in this way completes the bending of the second barrel piece 16 with the second barrel piece 16 slightly separated from the outer surface 15b. As shown in FIG. 20, the tip 16 a of the second barrel piece 16 overlaps the first barrel piece 15 when viewed from the third direction H. Further, the tip 16 a of the second barrel piece 16 overlaps the electric wire 50 when viewed from the third direction H. When the bending of the second barrel piece 16 by the second bending mold 132 is completed, the electric wire connecting portion 12 wraps the electric wire 50 inside.

(Pressing process)
The pressing step is a step of pressing the first barrel piece portion 15 and the second barrel piece portion 16 overlapped in the second bending step toward the first die 112 by the crimping die 133 and crimping to the electric wire 50. is there. A crimping mold 133 shown in FIG. 22 is one of three molds constituting the second mold 113. The crimping die 133 presses the first barrel piece 15 and the second barrel piece 16 toward the first die 112 and crimps the wire 50 as shown in FIGS. 23 and 24. As shown in FIG. 22, the crimping die 133 has concave portions 113 </ b> A ₁ and 113 </ b> B ₁ . The concave portions 113 </ b> A ₁ and 113 </ b> B ₁ are concave portions provided on the lower surface of the crimping die 133. The crimping die 133 has a first wall surface 115, a second wall surface 116, and a third wall surface 117 that constitute the concave portions 113 </ b> A ₁ and 113 </ b> B ₁ . The cross-sectional shape shown in FIG. 22 is a shape of the concave portion 113A _1, is similar to this is also the cross-sectional shape of the concave portion 113B _1.

The first wall surface 115 and the second wall surface 116 face each other in the second direction W. The third wall surface 117 connects the upper end of the first wall surface 115 and the upper end of the second wall surface 116. The third wall surface 117 is mainly composed of a curved portion 117T. The curved shape of the curved portion 117T is a shape that is recessed toward the back of the concave portions 113A ₁ and 113B ₁ , that is, upward. The curved portion 117T of this embodiment is curved so that the cross-sectional shape of the cross section shown in FIG. 22 is an arc shape.

  In the pressing step, the switching mechanism of the terminal crimping device 100 positions the crimping die 133 at the opposing position. The other two molds 131 and 132 are retracted from the facing positions by the switching mechanism. In the pressing step, the terminal crimping apparatus 100 lowers the crimping mold 133 toward the first mold 112. When the crimping die 133 is lowered in the pressing step, the curved portion 117T sandwiches the bottom 14, the electric wire 50, the first barrel piece 15 and the second barrel piece 16 between the first die 112, Press toward the first mold 112. As shown in FIGS. 23 and 24, the bottom portion 14, the electric wire 50, the first barrel piece portion 15, and the second barrel piece portion 16 are pressure-bonded to each other by the pressing force applied to the second barrel piece portion 16 by the curved portion 117 </ b> T. The

  As described above, the terminal crimping apparatus 100 according to the present embodiment includes the first mold 112 and the plurality of second molds 113. The first mold 112 has a bottom part of the crimp terminal 1 having a bottom part 14 as a bottom wall part, a first barrel piece part 15 as a first side wall part, and a second barrel piece part 16 as a second side wall part. 14 is supported. The first barrel piece 15 is a side wall portion protruding from one end of the bottom portion 14 in the width direction. The second barrel piece 16 protrudes from the other end in the width direction of the bottom portion 14 and is a side wall portion facing the first barrel piece portion 15 in the width direction of the bottom portion 14.

  The second metal mold 113 is a crimp terminal between the first metal mold 112 and the first metal mold 112 in a state where the electric wire 50 is installed in the space portion 12D surrounded by the bottom portion 14, the first barrel piece portion 15, and the second barrel piece portion 16. 1 is inserted. The second mold 113 includes a first bending mold 131, a second bending mold 132, and a crimping mold 133. The first bending die 131 bends the first barrel piece 15 toward the bottom 14 and overlaps the electric wire 50. The second bending mold 132 bends the second barrel piece 16 and overlaps the outer surface 15 b of the first barrel piece 15. The crimping die 133 presses the stacked first barrel piece 15 and second barrel piece 16 toward the first die 112 and crimps them to the electric wire 50.

  The terminal crimping apparatus 100 according to the present embodiment wraps the wire connecting portion 12 around the electric wire 50 stepwise by the first bending die 131, the second bending die 132, and the crimping die 133 and crimps them. A first bending step of bending the first barrel piece 15 and a second bending step of bending the second barrel piece 16 are performed separately, so that the first barrel piece 15 and the second barrel piece 16 are Interference is suppressed. Therefore, it is suppressed that the water stop member 20 affixed on the barrel piece parts 15 and 16 is scraped off. In addition, it is possible to secure a sufficient wrap width (overlap width) between the first barrel piece 15 and the second barrel piece 16 and to suppress variations in the wrap width.

  A second bending step of bending the second barrel piece 16 and a pressing step of pressing the first barrel piece 15 and the second barrel piece 16 toward the first mold 112 are performed separately. By performing the second bending step and the pressing step separately, it is possible to make the shapes of the molds 132 and 133 optimal for the required function. For example, the shape of the second bending mold 132 is preferably a shape more suitable for securing the lap width between the second barrel piece 16 and the first barrel piece 15. The shape of the crimping die 133 is preferably a shape that is more suitable for making the compression rate of the wire connection portion 12 and the wire 50 higher. By ensuring that the shapes of the molds 132 and 133 are more suitable for each process, it is possible to achieve both a sufficient and stable wrap width and a high compression ratio at the crimping point. By crimping at a high compression rate, the crimping strength of the crimp terminal 1 to the electric wire 50 is improved.

  According to the terminal crimping apparatus 100 of the present embodiment, the water stop member 20 is not easily scraped off from the wire connection portion 12 and the compression rate of the crimping portion is improved, so that the crimping portion between the electric wire 50 and the crimping terminal 1 is stopped. Water performance is improved. Moreover, the electrical performance in a crimping | compression-bonding location improves because a compression rate improves.

  The second bending mold 132 of the present embodiment has an inclined portion 117 </ b> S that faces the first mold 112 and that bends the second barrel piece 16 and overlaps the outer surface 15 b of the first barrel piece 15. When the first mold 112 and the second bending mold 132 are closest, the thickness of the second barrel piece 16 is between the outer surface 15b of the first barrel piece 15 and the third wall surface 117. There is a gap exceeding t1. Therefore, the second bending die 132 can advance the bending of the second barrel piece 16 without contacting the first barrel piece 15.

  Further, in the second bending mold 132 of the present embodiment, the inclined portion 117S is moved along the second direction W from the second barrel piece 16 side toward the first barrel piece 15 side toward the first die 112. It inclines with respect to the 2nd direction W so that it may distance from. In the second bending mold 132, the inclined portion 117 </ b> S is inclined in this manner, so that the second barrel piece 16 is overlaid on the outside of the first barrel piece 15, and The lap width of the two barrel pieces 16 can be set to an appropriate amount.

  Further, the first bending die 131 of the present embodiment has a groove portion 117 </ b> A that accommodates the second barrel piece portion 16 when approaching the first die 112. The first bending die 131 can bend the first barrel piece 15 without folding the second barrel piece 16 by accommodating the second barrel piece 16 in the groove 117A. The groove portion 117 </ b> A is an example of a housing portion that houses the second barrel piece portion 16. The shape of 117 A of groove parts is not limited to what was illustrated. For example, the groove 117A of the present embodiment has a width in the second direction W that decreases from the entrance toward the back, but instead, the width in the second direction W may be constant. The accommodating part that accommodates the second barrel piece 16 is not limited to the groove part 117 </ b> A, and may be, for example, a slit that penetrates the first bending die 131 in the third direction H.

  The manufacturing method of the electric wire with a terminal concerning this embodiment has the 1st bending process, the 2nd bending process, and a press process. In the first bending step, the crimp terminal 1 and the electric wire 50 are sandwiched between the first die 112 and the first bending die 131, and the first barrel piece 15 is bent toward the bottom portion 14 side, thereby electric wires. 50. In the second bending step, the crimp terminal 1 and the electric wire 50 are sandwiched between the first mold 112 and the second bending mold 132, the second barrel piece 16 is bent, and the first barrel piece 15 This is a step of overlapping the outer side surface 15b. In the pressing step, the crimp terminal 1 and the electric wire 50 are sandwiched between the first mold 112 and the crimp mold 133, and the first barrel piece 15 and the second barrel piece 16 that are overlapped are joined to the first mold 112. This is a step of pressing toward the wire and crimping the wire 50 on the wire. The method for manufacturing the electric wire with terminal according to the present embodiment can improve the performance of the crimp terminal 1.

[Modification of Embodiment]
In the above embodiment, the core wire crimping portion 12A and the covering crimping portion 12B are integrated, but instead of this, the core wire crimping portion 12A and the covering crimping portion 12B may be provided independently of each other. In this case, the molds 131, 132, 133 for crimping the core wire crimping part 12A to the core wire 51 and the molds 131, 132, 133 for crimping the covering crimping part 12B to the coating 52 are integral molds. Separate molds may be used.

  The second mold 113 may have four or more molds. For example, the second mold 113 may have another mold in addition to the first bending mold 131, the second bending mold 132, and the crimping mold 133. Another mold is used in any one of the first bending step, the second bending step, and the pressing step, for example. As an example, the first bending process may be divided into a bending process using the first bending mold 131 and a bending process using another mold.

  In the above embodiment, the terminal crimping apparatus 100 moves the three molds 131, 132, and 133 according to the process to be performed. Instead, the terminal crimping apparatus 100 moves the first mold 112 or the first mold 112. May be moved. For example, the terminal crimping apparatus 100 may have three first molds 112 corresponding to the three molds 131, 132, and 133. In this case, the terminal crimping apparatus 100 uses the first mold 112 corresponding to the first bending mold 131 and the first mold corresponding to the second bending mold 132 as the crimp terminal 1 according to the process to be executed. 112, and sequentially move to the first mold 112 corresponding to the crimping mold 133. Further, the terminal crimping apparatus 100 may sequentially move one first mold 112 on which the crimp terminal 1 is placed to a position facing each mold 131, 132, 133 according to the process. Good.

  The terminal crimping apparatus 100 according to the present embodiment is suitable for the crimp terminal 1 in which the first barrel piece 15 and the second barrel piece 16 are overlapped and crimped to the electric wire 50, but is referred to as a so-called B crimp. The present invention is also applicable to the crimp terminal 1 that is crimped.

  The contents disclosed in the above embodiments and modifications can be executed in appropriate combination.

DESCRIPTION OF SYMBOLS 1 Crimp terminal 10 Terminal metal fitting 11 Terminal connection part 11a Side wall 12 Electric wire connection part 12A Core wire crimping part 12B Covering crimping part 12C Connection crimping part 12D Space part 13 Connection part 13a Side wall 14 Bottom part (bottom wall part)
15 First barrel piece (first side wall)
15a tip 15b outer surface 16 second barrel piece (second side wall)
16a tip 16b inner surface 17 serration region 17a recess 20 water stop member 21 first water stop 22 second water stop 23 third water stop 30 terminal chain 31 connection piece 31a terminal feed hole 32 connection 50 electric wire 51 Core wire 52 Coating 100 Terminal crimping device 101 Terminal supply device 101a Terminal feed member 101b Power transmission mechanism 102 Crimping device 103 Driving device 110 Crimping machine 111 Frame 111A Base 111B Anvil support 111C Transmission support 111C ₁ Standing part 111C ₂ Ram Support portion 111D Support base 112 First mold 112a Upper surface edge 112A First anvil 112A ₁ concave surface 112B Second anvil 112B ₁ concave surface 113 Second mold 113A First crimper 113A ₁ concave portion 113B 2nd crimper 113B ₁ concave portion 114 Force transmission mechanism 114A ram 114B ram bolt 114B ₁ bolt head 114C shank 114C ₁ male threaded portion 114D nut 115 first wall surface 116 second wall 117 the third wall surface 117A groove 117B, 117C wall 117D inclined portion 117R, 117T curved portion 117S inclined portion 118 electric wire holding device 118A electric wire holding space 120 terminal cutting mechanism 121 terminal cutting body 121a sliding contact surface 121b slit 121c opening edge 121d upper surface 122 pressing member 123 elastic member 131 first bending die 132 second bending die 133 crimping die F1, F2 Force L First direction W Second direction H Third direction

Claims (3)

A bottom wall portion, a first side wall portion projecting from one end in the width direction of the bottom wall portion, a first wall portion projecting from the other end in the width direction of the bottom wall portion, and the first side wall portion in the width direction A first mold for supporting the bottom wall portion of the crimp terminal having an opposing second side wall portion;
A plurality of second molds sandwiching the crimp terminal with the first mold in a state where an electric wire is installed in a space part surrounded by the bottom wall part, the first side wall part, and the second side wall part. When,
With
The plurality of second dies are:
A first bending mold for folding the first side wall part toward the bottom wall part and overlapping the electric wire;
A second bending mold for folding the second side wall and overlapping the outer side surface of the first side wall;
A crimping die that presses the first side wall portion and the second side wall portion, which are overlapped, against the first die and is crimped to the electric wire;
A terminal crimping apparatus comprising: The second bending mold has an opposing wall surface that faces the first mold and bends the second side wall portion and overlaps the outer side surface of the first side wall portion,
When the first mold and the second bending mold are closest to each other, a gap exceeding the thickness of the second side wall portion is formed between the outer side surface of the first side wall portion and the opposing wall surface. The terminal crimping apparatus according to claim 1. A bottom wall portion, a first side wall portion projecting from one end in the width direction of the bottom wall portion, a first wall portion projecting from the other end in the width direction of the bottom wall portion, and the first side wall portion in the width direction The electric wire by sandwiching a crimp terminal having a second side wall portion and an electric wire between the first mold and the first bending die and bending the first side wall portion toward the bottom wall portion. A first bending process overlaid on
A second bending step in which the crimp terminal and the electric wire are sandwiched between the first mold and the second bending mold, the second side wall is bent, and the second side is overlapped with the outer side surface of the first side wall; ,
The crimp terminal and the electric wire are sandwiched between the first mold and the crimp mold, and the stacked first side wall and second side wall are pressed toward the first mold. A method for producing a terminal-attached electric wire, comprising: a pressing step for crimping the electric wire.

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