JP6324267B2 - Method for manufacturing crimp connection structure - Google Patents

Description

  The present invention relates to a crimp connection structure in which a covered electric wire is crimp-connected to a crimp terminal, a manufacturing method thereof, a terminal crimping device, and a terminal crimping tooth mold.

  In recent years, with the increase in functionality and performance of automobiles, various electrical equipment has been mounted on automobiles, so that the electrical circuit of automobiles has become complicated, and power can be stably supplied to each electrical equipment. It has become indispensable. In an automobile on which various electrical equipment is mounted, a wire harness formed by bundling a plurality of covered electric wires is routed, and an electric circuit is formed by connecting the wire harnesses with a connector.

  Further, Patent Document 1 proposes a crimp connection structure that is provided inside a connector that connects wire harnesses and is configured by crimping and connecting a covered electric wire to a crimp terminal. In this crimp connection structure, a covered electric wire is crimped to a crimp terminal by a terminal crimping device. The covered electric wires are connected to each other by fitting and connecting a crimp connection structure having a male crimp terminal and a crimp connection structure having a female crimp terminal.

JP 2014-116323 A

  However, the present inventor manufactured the above-described conventional crimp connection structure and observed the portion where the covered electric wire was crimped on the crimp terminal, and found that the following problems existed. FIG. 16 is a cross-sectional view of a covered electric wire and a crimp terminal for explaining the problems of the crimp connection structure found by the present inventors.

  As shown in FIG. 16, the conventional crimp connection structure 100 has a portion in which a covered electric wire 101 made of an aluminum core wire 101a and a covering 101b is inserted into a crimp portion 102 of a crimp terminal. Further, in the crimping portion 102 of the crimping terminal, the flat plate is formed into a substantially O shape when viewed from the rear, and then welded at the welded portion W. When the present inventor observed the cross section of the crimping portion 102 with respect to such a crimped connection structure 100, the crimping portion 102 jumped out at the welded portion W and entered the coated electric wire 101 side, and the recess It was found that 103 was formed. Thus, when the recessed part 103 is formed in the covered wire | conductor 101, the coating 101b will become thin in the recessed part 103, and the problem that the water stop property of the crimping | bonding connection structure 100 will fall significantly in the thin part of the coating 101b arises.

  The present invention has been made in view of the above-mentioned problems, and the purpose of the present invention is to have a size that protrudes to the coated side of the covered electric wire in the vicinity of the welded portion of the crimped portion at the portion where the coated electric wire in the crimped connection structure is crimped. It is an object of the present invention to provide a crimped connection structure and a method for manufacturing the same, a terminal crimping apparatus, and a terminal mold for terminal crimping.

  In order to solve the above-described problems and achieve the above object, the manufacturing method of the crimp connection structure according to the present invention uses the first terminal crimping tooth mold and the second terminal crimping tooth mold, A crimped portion formed into a cross-sectional hollow cylindrical shape having a conductor portion and a covered wire covering the conductor portion, and having one end portion in the longitudinal direction sealed and having a weld portion along the longitudinal direction A method for manufacturing a crimp connection structure for crimping to a crimp terminal, wherein a covered electric wire is inserted from the other end of the crimp portion, and the crimp terminal placed on the first terminal crimping tooth mold Then, when lowering the second terminal crimping tooth mold and crimping the crimping section, the crimp terminal is moved so that the welded portion in the crimping section faces the mounting surface of the first terminal crimping tooth mold. It mounts on the tooth type | mold for 1 terminal crimping.

  The manufacturing method of the crimping connection structure according to the present invention is a method of using a first terminal crimping tooth mold and a second terminal crimping tooth mold to cover a conductor portion and a covered electric wire having a covering portion that covers the conductor portion. A method of manufacturing a crimped connection structure having a crimped portion formed in a cross-sectional hollow cylindrical shape having one end in the longitudinal direction sealed and having a welded portion along the longitudinal direction. And the crimping portion and the first terminal crimping tooth mold and the second terminal crimping portion between the crimping portion and at least one of the first terminal crimping tooth mold and the second terminal crimping tooth mold. Friction coefficient reduction processing for reducing the friction coefficient with at least one of the dental molds is performed.

  A terminal crimping apparatus according to the present invention includes a first terminal crimping tooth mold configured to be able to place a crimp terminal, and a crimp portion of the crimp terminal placed on the first terminal crimping tooth mold. The second terminal crimping tooth mold to be fastened is configured to be detachable, and is formed in a cross-sectional hollow cylinder shape having one end portion along the longitudinal direction sealed and a welded portion along the longitudinal direction. A crimping terminal for crimping a coated wire having a conductor portion and a covering portion covering the conductor portion to at least one of a first terminal crimping tooth mold and a second terminal crimping tooth mold A concave portion is formed in a portion of the surface in contact with the crimp terminal.

  In the terminal crimping apparatus according to the present invention, in the above invention, the concave portion is located at a position facing the welded portion in at least one of the first terminal crimping tooth mold and the second terminal crimping tooth mold. It consists of the groove | channel formed along.

  A terminal crimping apparatus according to the present invention includes a first terminal crimping tooth mold configured to be able to place a crimp terminal, and a crimp portion of the crimp terminal placed on the first terminal crimping tooth mold. The second terminal crimping tooth mold to be fastened is configured to be detachable, and is formed in a cross-sectional hollow cylinder shape having one end portion along the longitudinal direction sealed and a welded portion along the longitudinal direction. In the terminal crimping apparatus for crimping the coated wire having the conductor portion and the covering portion covering the conductor portion to the crimped terminal, the radius of curvature of the pressing surface contacting the crimp terminal of the second terminal crimping tooth mold is It is characterized by being larger than the curvature radius of the cylindrical shape in the cross section perpendicular to the longitudinal direction.

  The terminal crimping tooth mold according to the present invention is a crimp terminal having a crimp portion formed in a cross-sectional hollow cylindrical shape having one end portion along the longitudinal direction sealed and having a weld portion along the longitudinal direction. And a terminal crimping device for crimping the crimping part, wherein the terminal crimping apparatus is configured to be detachable with respect to the terminal crimping apparatus for crimping the covered electric wire having the conductor part and the covering part covering the conductor part. The terminal crimping tooth mold is composed of a first terminal crimping tooth mold and a second terminal crimping tooth mold, and at least one of the first terminal crimping tooth mold and the second terminal crimping tooth mold A concave portion is formed in a portion in a plane that comes into contact with the crimp terminal.

  The terminal crimping tooth mold according to the present invention is a crimp terminal having a crimp portion formed in a cross-sectional hollow cylindrical shape having one end portion along the longitudinal direction sealed and having a weld portion along the longitudinal direction. And a terminal crimping device for crimping the crimping part, wherein the terminal crimping apparatus is configured to be detachable with respect to the terminal crimping apparatus for crimping the covered electric wire having the conductor part and the covering part covering the conductor part. The terminal crimping tooth mold is composed of a first terminal crimping tooth mold and a second terminal crimping tooth mold, and in the second terminal crimping tooth mold, a press that comes into contact with the crimping portion when the crimping portion is crimped The curvature radius of the surface is larger than the curvature radius of the cylindrical shape in the cross section perpendicular to the longitudinal direction of the crimping portion.

  The crimp connection structure according to the present invention is a crimp connection structure in which a covered electric wire having a covering portion covering a conductor portion and a conductor portion is connected to a crimp terminal having a crimp portion connecting to the covered electric wire by crimping, The crimping portion is sealed at one end in the longitudinal direction and is formed in a cross-sectional hollow cylindrical shape having a welded portion along the longitudinal direction, and the other end of the crimping portion is crimped to the covered electric wire. In the cross section perpendicular to the longitudinal direction at the portion where the sheathed portion of the covered electric wire is crimped, the amount of protrusion from the crimped portion to the sheathed portion in the vicinity of the welded portion is near the welded portion. And it is 0 times or more and 0.5 times or less of the coating thickness before the crimping | compression-bonding of the coating | coated part in parts other than the vicinity of a welding part.

  According to the crimp connection structure and the manufacturing method thereof, the terminal crimping device, and the terminal crimping tooth mold according to the present invention, the coated wire in the crimp connection structure is covered in the vicinity of the welded portion of the crimp portion. It is possible to reduce the size of the electric wire protruding to the covering side of the electric wire, and it is possible to further improve the water stoppage in the crimp connection structure.

FIG. 1 is a longitudinal perspective view in which a crimp terminal according to an embodiment of the present invention is divided at a central portion in the width direction. FIG. 2 is a perspective view for explaining a method of manufacturing a crimp terminal in the embodiment of the present invention. FIG. 3 is a perspective view for explaining a method of manufacturing a crimp terminal in the embodiment of the present invention. FIG. 4 is a side view for explaining the terminal crimping apparatus used in the embodiment of the present invention. FIG. 5 is a perspective view showing an example of an anvil and a crimper of a terminal crimping apparatus used in the embodiment of the present invention. FIG. 6 is a perspective view showing a state before the covered electric wire is crimped to the crimp terminal in the embodiment of the present invention. FIG. 7 is a perspective view showing a state where a covered electric wire is crimped to a crimp terminal according to an embodiment of the present invention. 8 is a cross-sectional view of the crimping part along the line AA in FIG. FIG. 9 is a cross-sectional view for explaining the method for manufacturing the crimp connection structure according to the first example of the embodiment of the present invention. FIG. 10 is a cross-sectional view for explaining the method for manufacturing the crimp connection structure according to the first example of the embodiment of the present invention. FIG. 11 is a partial cross-sectional view for explaining the covered electric wire and the crimping portion according to the second example of the embodiment of the present invention. FIG. 12: is sectional drawing for demonstrating the manufacturing method of the crimping connection structure by the 4th Example in embodiment of this invention. FIG. 13: is sectional drawing for demonstrating the manufacturing method of the terminal crimping apparatus and crimping connection structure by the 5th Example in embodiment of this invention. FIG. 14: is sectional drawing for demonstrating the manufacturing method of the terminal crimping apparatus and crimping connection structure by the 5th Example in embodiment of this invention. FIG. 15: is sectional drawing for demonstrating the welding part of the crimp part of the crimp terminal by the 6th Example in embodiment of this invention. FIG. 16 is a cross-sectional view of a crimping portion for explaining problems in a conventional crimped connection structure.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, this invention is not limited by the following embodiment. In the drawings, the same or corresponding elements are denoted by the same reference numerals as appropriate, and repeated descriptions are omitted as appropriate. Furthermore, it should be noted that the drawings are schematic, and dimensional relationships between elements may differ from actual ones. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included. In addition, the covered electric wires employed in the following embodiments are thick (AL), thin (ALSS), and ultra thin (ALUS) HF (halogen-free) aluminum low-voltage electric wires according to the JASO D 602: 2011 standard. It is a PVC aluminum electric wire (ALV, ALVSS, ALVUS) having the same size as the size.

(Composition of crimp terminal)
First, the crimp terminal which comprises the crimp connection structure by embodiment of this invention is demonstrated. FIG. 1 is a longitudinal perspective view in which a crimp terminal according to an embodiment of the present invention is divided at a central portion in the width direction.

  As shown in FIG. 1, the crimp terminal 10 in this embodiment includes a box portion 20 and a crimp portion 30. The box portion 20 is formed, for example, as a female crimp terminal, and forms a hollow rectangular column body into which an insertion tab of the male crimp terminal is inserted from the front, which is the front end side in the longitudinal direction X, to the rear. Further, the crimping portion 30 has a substantially O shape in rear view provided behind the box portion 20 via the transition portion 40 and the concave sealing portion 35 having a predetermined length.

  In the present specification, the longitudinal direction X means the longitudinal direction of the crimp terminal 10, that is, the direction that coincides with the longitudinal direction of the covered electric wire to be crimped and connected in the crimp portion 30. Further, the width direction Y means a direction intersecting the longitudinal direction X in a substantially horizontal plane. Further, the height direction Z means a direction substantially perpendicular to a plane including the longitudinal direction X and the width direction Y. Moreover, in this specification, the direction by the side of the box part 20 with respect to the crimping | compression-bonding part 30 is described with the front, and conversely, the direction by the side of the crimping part 30 with respect to the box part 20 is described with the back.

  The crimp terminal 10 is a closed barrel type terminal. That is, the crimp terminal 10 is punched into a shape of a crimp terminal 10 in which a copper alloy strip such as brass whose surface is tin-plated (Sn plated) is flattened, and then the copper alloy strip is a box of a hollow rectangular column. The crimping portion 30 is welded by bending into a three-dimensional terminal shape composed of a portion 20 and a crimping portion 30 having a substantially O-shape in rear view.

  The box portion 20 includes an elastic contact piece 21 that is bent rearward in the longitudinal direction X and that contacts the insertion tab of the male crimp terminal. The box portion 20 is bent in such a manner that side surface portions 23 continuously provided on both sides in the width direction Y of the bottom surface portion 22 are overlapped, and is configured in a substantially rectangular shape when viewed from the front side in the longitudinal direction X.

  The crimping part 30 before crimping the covered electric wire has the crimping surface 31 and the barrel component piece 32 extending to both sides in the width direction Y of the crimping surface 31 rounded, and the opposed end portions 32a of the barrel component piece 32 are butted together. By welding, it is formed in a substantially O-shape in rear view. The length along the longitudinal direction X of the barrel component piece 32 is longer than the length along the longitudinal direction X of the conductor portion exposed from the covered electric wire.

  The crimping portion 30 includes a coated crimping range 30a for crimping the insulation coating of the coated wire, an electric wire crimping range 30b for crimping the electric wire exposed from the coated wire, and a sealing portion 30c crushed on the front side from the electric wire crimping range 30b. .

  In addition, a plurality of wire locking grooves 34 made of grooves extending in the width direction Y are formed on the inner surface of the crimping portion 30 at predetermined intervals along the longitudinal direction X. Specifically, on the inner surface of the wire crimping range 30b in the crimping portion 30, a wire locking groove 34 (also referred to as a selection) into which the wire exposed from the covered wire in the crimped state has a predetermined interval in the longitudinal direction X. For example, three are formed side by side in a rectangular cross-sectional shape. Moreover, the locking groove 34 for electric wires is formed from the crimping surface 31 to the middle of the barrel component piece 32, and improves the electrical conductivity between the crimping part 30 and the covered electric wire by biting the electric wire exposed from the covered electric wire. ing. In addition, the inner surfaces of the barrel constituting pieces 32 are brought into close contact with each other, and a concave sealing portion 35 having a substantially U-shaped cross section that is wide in the width direction Y when viewed from the front side in the longitudinal direction X is formed.

(Crimp terminal manufacturing method)
Next, a method for manufacturing the crimp terminal 10 configured as described above will be described. 2 and 3 are perspective views for explaining a method of manufacturing a crimp terminal in this embodiment. As shown in FIG. 2 and FIG. 3, in this embodiment, welding is performed in which a longitudinal direction weld location (hereinafter, welded portion) W <b> 1 changes in the height direction. In this case, the crimp part 30 of various shapes can be formed.

  That is, first, as shown in FIG. 2, after rolling a copper alloy strip as a plate material punched into a terminal shape by pressing, the front end portion in the longitudinal direction X is crushed so as to include the sealing portion 30 c. The shape is formed in advance. Then, fiber laser welding in which the focal positions are appropriately adjusted along the longitudinal direction X between the opposed end portions 32a that are abutted by rounding is performed. Thereby, as shown in FIG. 3, the crimping | compression-bonding part 30 is welded. Moreover, welding is performed along the width direction welding location W2 in the width direction Y. The crimp part 30 is formed by the above. Thereby, as shown in FIG. 2 and FIG. 3, the crimp terminal 10 can be processed through the series of steps from the press processing to the fiber laser welding described above without turning over. Therefore, the manufacturing process can be simplified, and for example, mass production of the crimp terminals 10 of about several hundred pieces / minute becomes possible, and cost reduction associated with mass production can be realized.

(Terminal crimping device)
Next, the terminal crimping apparatus used when crimping a conducting wire to the crimp terminal 10 configured as described above will be described. FIG. 4 shows a terminal crimping apparatus according to this embodiment. As shown in FIG. 4, the terminal crimping device 300 is a device for crimping and connecting the covered electric wire 200 to the crimping terminal 10. Further, the front / rear, left / right and up / down directions of the terminal crimping apparatus 300 are the same as the X direction, Y direction, and Z direction of the crimp terminal 10 described above, and in FIG. Upper, lower, rear and front.

  As shown in FIG. 4, the terminal crimping apparatus 300 includes an anvil installation table 302, an electric wire pressing member 304, a guide member 305, a cut holder 306, a pressing device 307, and a terminal placement unit 308 provided on the device table 300 a. And an elevating part 301 for elevating and lowering a crimper described later. An insulation barrel crimper 301a and a wire barrel crimper 301b (hereinafter referred to as crimpers 301a and 301b) as movable second terminal crimping teeth are configured to be attachable to and detachable from the terminal crimping device 300 by an elevating unit 301. This is a terminal crimping means that descends relative to the crimp terminal 10 and crimps the crimp part 30. Similarly, the anvil 302a serving as the fixed first terminal crimping tooth mold is configured to be detachable from the terminal crimping apparatus 300 on the anvil installation base 302, and the crimping portion 30 of the crimping terminal 10 is placed thereon. Terminal mounting means. FIG. 5 is a perspective view showing an example of the crimpers 301a and 301b and the anvil 302a. The crimpers 301a and 301b and the anvil 302a are respectively crimped by appropriately selecting the crimpers 301a and 301b and the anvil 302a as shown in FIG. 5 according to the shape of the crimp terminal 10 to be crimped and the method of crimping. Mounted on the device 300.

  As shown in FIG. 4, the wire pressing member 304 is for pressing the covered electric wire 200 during crimping, and is provided on the rear surface of the insulation barrel crimper 301 a so as to be movable up and down. The guide member 305 is provided at a position away from the crimpers 301a and 301b by a predetermined distance on the rear side, and guides the covered electric wire 200 to be crimped. The guide member 305 is made of a plate-like member having a notch 305a that supports the covered electric wire 200 on the upper edge, and is configured to be adjustable to a desired position for guiding the covered electric wire 200. The guide member 305 is movable in the front-rear direction, that is, in the direction approaching or separating from the crimp terminal 10 by sandwiching a spacer (not shown) between the guide member 305 and the cut holder 306.

  The cut holder 306 is a carrier cutting means that shears and cuts the carrier K that is a thin joint portion when the crimp terminal 10 is continuously connected and continuously supplied by a slide cutter (not shown). The pressing device 307 is a device for pressing so that the crimp terminal 10 is not displaced during caulking. Furthermore, the terminal mounting portion 308 is a crimp terminal supporting means for mounting, for example, the box portion 20 of the crimp terminal 10.

(Method for manufacturing crimp connection structure)
Next, a crimping method for crimping the covered electric wire 200 to the crimp terminal 10 using the terminal crimping apparatus 300 configured as described above will be described. 6 and 7 are perspective views of the crimp terminal 10 and the covered electric wire 200 for explaining the crimping method according to this embodiment.

  First, as shown in FIG. 6, by removing the insulating coating 202 that is the covering portion at the tip of the covered electric wire 200, the electric wire exposed portion 201 a that is the tip portion of the aluminum core wire 201 is exposed. In addition, it is also possible to use copper (Cu) other than aluminum (Al) as the material of the conducting wire. Next, as shown in FIG. 4, the crimp terminal 10 is set on the anvil 302 a and the height position of the covered electric wire 200 and the position in the front-rear direction are adjusted by the guide member 305. And after making the central axis parallel to the longitudinal direction X passing through the center in the circular cross section perpendicular to the longitudinal direction X in the covered electric wire 200 and the central axis parallel to the longitudinal direction X of the crimping part 30 coincide, FIG. The covered electric wire 200 is inserted into the crimping part 30 as shown in FIG. Thereby, it inserts so that the central axis of the covered electric wire 200 may become parallel along the longitudinal direction X of the crimping | compression-bonding part 30. FIG. And the covered electric wire 200 is inserted and arrange | positioned at the crimping | compression-bonding part 30 so that the position of the longitudinal direction X of the front-end | tip 201aa of the electric wire exposure part 201a may become back from the sealing part 30c in the crimping | compression-bonding part 30.

  Thereafter, as shown in FIG. 4, the crimpers 301 a and 301 b and the wire pressing member 304 are lowered while the covered wire 200 is supported by the notch 305 a. The electric wire holding member 304 fixes and holds the covered electric wire 200, and the crimpers 301a and 301b respectively crimp the portions of the crimping portion 30, whereby the electric wire exposed portion 201a and the covered electric wire 200 are crimped. As a result, as shown in FIG. 7, from the tip 201aa of the wire exposed portion 201a to the rear side of the coating tip 202a of the insulating coating 202 is crimped by the crimping portion 30 and is integrally surrounded. That is, the crimping portion 30 is crimped in a state of being in close contact with the insulating coating 202 of the covered electric wire 200 and the peripheral surface of the exposed wire portion 201a.

  In the crimping operation by the terminal crimping apparatus 300, the crimp terminal 10 is in a state of being attached to the band-shaped carrier K shown in FIGS. Therefore, the crimp terminal 10 is separated from the carrier K by the cut holder 306 when the covered wire 200 is crimp-connected or after the covered wire 200 is crimp-connected. It is also possible to form the crimp terminal 10 in a state where it is separated from the carrier K and to crimp the connection of the covered electric wire 200.

  At the time of this crimping, the inner peripheral surface of the crimping part 30 may protrude in the vicinity of the welded part W1 in the region behind the coating tip 202a surrounded by the crimping part 30, and a recess may be formed in the insulating coating 202. Therefore, in this embodiment, the size of the protruding portion is minimized by performing pressure bonding based on various methods. Note that details of various methods for minimizing the pop-out amount of the pop-out portion will be described later.

FIG. 8 is a cross-sectional view taken along line AA of the crimped connection structure 1 shown in FIG. As shown in FIG. 8, in the crimped connection structure 1 manufactured as described above, an insulating coating is provided in the vicinity of the welded portion W1 in the portion of the insulating coating 202 surrounded by the crimping portion 30 behind the coating tip 202a. A protruding portion 32 p is generated with respect to 202. As a result, in the insulating coating 202, a portion is formed in the vicinity of the welded portion W <b> 1 of the crimping portion 30 that is smaller than the coating thickness of the insulating coating 202 before the crimping. That is, the protruding portion 32p has a cross-sectional shape assumed in the rear view (a broken line curve in FIG. 8) in the vicinity of the welded portion W1 and the welded portion W1 of the crimped portion 30 of the crimp terminal 10 (hereinafter, the vicinity including the welded portion W1). ) From the insulating coating 202 side. In other words, ledge 32p is in the vicinity including the welds W1 at the compression bonding portion 30, the crimping portion 30 which forms a region coating thickness is less than the coating thickness t ₀ of the insulating coating 202 other than the vicinity, including the weld W1 It consists of parts.

Therefore, in this embodiment, the protruding amount Δt of the protruding portion 32p is determined by the coating thickness t in the portion where the insulating coating 202 is thinnest in the radial direction in the vicinity including the welded portion W1 and the crimping in the portion other than the vicinity of the welded portion W1. It can be defined by the coating thickness difference (t ₀ −t) with the coating thickness t ₀ of the subsequent insulating coating 202. Here, in this embodiment, the protruding amount Δt of the protruding portion 32p is more than 0 times and 0.5 times or less with respect to the coating thickness before the coated electric wire 200 is crimped to the crimp terminal 10. preferable. Furthermore, it is most preferable that the protruding amount Δt of the protruding portion 32p is 0 times the coating thickness before the covered electric wire 200 is crimped to the crimp terminal 10, that is, the protruding portion 32p does not occur. Thereby, the fracture | rupture of the insulation coating 202 is suppressed, water stoppage is further improved, a desired elastic force can be maintained, and the crimped connection structure 1 with improved reliability can be obtained.

(First embodiment)
Next, the terminal crimping method in the manufacturing method of the crimp connection structure using the terminal crimping apparatus according to the first embodiment in the manufacture of the crimp connection structure 1 configured as described above will be described. FIGS. 9 and 10 are cross-sectional views of a part of the terminal crimping apparatus and the crimping part for explaining the terminal crimping method according to the first embodiment. As shown in FIG. 9, in the terminal crimping apparatus according to the first embodiment, the crimping part 30 is welded to the pressing surface against the crimping part 30 in the crimper 301a (see FIG. 4) for crimping the crimping part 30. A groove 301aa as a recess is formed substantially parallel to the portion W1. Here, in order to reduce deformation in the vicinity including the welded portion W1 caused by the stress generated in the barrel constituting piece 32, the groove 301aa corresponds to the welded portion W1 of the crimped portion 30 when the crimped portion 30 is caulked. It is desirable to form in the position.

  The position of the groove is not necessarily limited to the position corresponding to the welded portion W1. That is, you may provide a groove | channel in the part in the press surface with respect to the crimping | compression-bonding part 30 which is a surface where the crimper 301a contacts the crimping | compression-bonding part 30 at the time of caulking. Furthermore, a groove may be provided in a portion in the placement surface, which is a surface in contact with the crimping portion 30 in the anvil 302a, in parallel with the welded portion W1 of the crimping portion 30. Furthermore, as long as the stress generated in the barrel component piece 32 can be released toward the outside of the crimping portion 30, the shape is not necessarily limited to the groove shape, and discrete and partial recesses may be provided in the crimper 301a and the anvil 302a. Is possible.

  Thus, the groove 301aa is formed on the surface that contacts the crimping portion 30 in at least one of the crimper 301a and the anvil 302a. As a result, as shown in FIG. 10, when the crimper 301a descends and crimps the crimping portion 30, the stress in the barrel component piece 32 generated according to the external force applied to the crimping portion 30 is directed toward the groove 301aa. Act to escape. Here, the strength of the welded portion W1 is inferior to that of the portion other than the welded portion W1 in the crimping portion 30. Therefore, when caulking the crimping portion 30, the portion of the welded portion W1 is most easily deformed. On the other hand, in the first embodiment, since the stress in the barrel component piece 32 acts so as to escape toward the groove 301aa, the stress acting on the welded portion W1 can be reduced. Therefore, the formation of the protruding portion 32p caused by the stress can be suppressed, and the protruding amount Δt of the protruding portion 32p can be reduced.

The groove width L _w of the first embodiment the groove 301aa formed in the crimper 301a or anvil 302a by the substantially equal size are preferred for the welding of the width of the welded portion W1. This is because, if the groove width L _w of the groove 301aa is large, part of the portion or barrel structure pieces 32 of the welding portion W1 is due to occur that potentially popping the outer periphery outside the crimping portion 30. That is, if the welded portion W1 or the barrel component piece 32 protrudes to the outside of the outer periphery of the crimping portion 30, it may become an obstacle when the crimping terminal 10 is fitted or installed in another casing. This is to avoid this obstacle. As described above, the desired crimped connection structure 1 in which the protruding amount Δt of the protruding portion 32p is reduced is manufactured.

(Second embodiment)
Next, the crimp terminal 10 and the covered electric wire 200 according to the second embodiment, which are preferably used for manufacturing the crimp connection structure 1 configured as described above, will be described. FIG. 11 is a cross-sectional view for explaining the crimp terminal 10 and the covered electric wire 200 according to the second embodiment.

As shown in FIG. 11, in the second embodiment, the inner diameter D of the crimping portion 30 into which the covered electric wire 200 is inserted is made substantially equal to the outer diameter of the covered electric wire 200. More specifically, in order to insert the covered electric wire 200 into the crimping portion 30, assuming that the inner diameter D of the crimping portion 30 is equal to or larger than the outer diameter c of the covered electric wire 200 (D ≧ c), It is desirable to make the gap between the inner periphery and the outer periphery of the covered wire 200 as small as possible. Specifically, in the second embodiment, the difference between the inner diameter D of the crimping portion 30 and the outer diameter c of the covered electric wire 200 is 0% or more and 0.75% or less with respect to the outer diameter c of the covered electric wire 200. To do. That is, the following equation (1) is established.
0 ≦ ( D−c) /c≦0.75 (1)
As a result, the gap between the barrel component piece 32 constituting the crimping portion 30 and the insulating coating 202 of the covered electric wire 200 is extremely small or eliminated.

  On the other hand, if the gap between the barrel component piece 32 and the insulating coating 202 is large, the portion of the barrel component piece 32 enters the gap toward the insulating coating 202 during caulking, and the inserted portion acts on the insulating coating 202. There is a possibility that the protruding portion 32p is likely to occur. On the other hand, according to the second embodiment, since the gap between the barrel component piece 32 and the insulating coating 202 is extremely small, it is extremely possible that the protruding portion 32p is generated in the vicinity including the welded portion W1 during crimping. Can be lowered. Further, when the gap between the barrel component piece 32 and the insulating coating 202 is small, the crimping portion 30 is crimped while the coated electric wire 200 is brought into contact with the welded portion W1 of the crimping portion 30 so that the popping portion 32p pops out. The amount Δt can be further reduced. Thus, the desired crimped connection structure 1 in which the pop-out amount Δt of the pop-out portion 32p is reduced is manufactured.

(Third embodiment)
Next, the covered electric wire 200 according to the third embodiment, which is preferably used for manufacturing the crimp connection structure 1 configured as described above, will be described. In the covered electric wire 200 according to the third embodiment, the insulation electric wire 202 can be crimped to the crimping terminal 10 by performing the process of hardening the insulating electric coating 202, and the crimping portion 30 can be crimped. The hardness is set such that the protruding portion 32p does not easily occur in the vicinity of the welded portion W1. As a result, the crimping terminal 10 and the covered electric wire 200 can be crimped, and the force necessary to cause elastic deformation of the insulating coating 202 can be greatly increased, so that the protruding portion 32p in the vicinity including the welded portion W1 during crimping. Can be suppressed. It is also possible to apply a cured resin to at least a portion of the insulating coating 202 that is in contact with the welded portion W1, that is, at least a portion corresponding to the welded portion W1 on the surface of the insulating coating 202 when the crimping portion 30 is crimped. is there. Thereby, since the hardness of the part which touches at least the welding part W1 of the insulation coating 202 can be made high, the effect similar to the above can be acquired. Thus, the desired crimped connection structure 1 in which the pop-out amount Δt of the pop-out portion 32p is reduced is manufactured.

(Fourth embodiment)
Next, the terminal crimping method in the manufacturing method of the crimp connection structure by the 4th Example in the crimp connection structure 1 comprised as mentioned above is demonstrated. FIG. 12 is a cross-sectional view for explaining a terminal crimping method according to the fourth embodiment.

  As shown in FIG. 12, in the fourth embodiment, in the crimping method using the terminal crimping apparatus 300, when the crimp terminal 10 and the covered electric wire 200 are crimped, the welded portion W1 is positioned on the anvil 302a side. And press-bond. As described above, in the terminal crimping apparatus 300, the anvil 302a is fixed, and the crimper 303A is configured to be movable up and down. Therefore, in the fourth embodiment, the crimper 303A is lowered to crimp the crimping part 30 while the welded part W1 of the crimping part 30 is positioned on the fixed anvil 302a side. Thereby, the external force applied to the crimping part 30 is diffused on the contact surface between the crimper 303A and the crimping part 30 by the movable crimper 303A. Therefore, since the stress acting on the welded portion W1 is reduced due to the stress generated in the barrel constituting piece 32, the pop-out amount Δt of the pop-out portion 32p formed due to the stress can be reduced. As described above, the desired crimped connection structure 1 in which the protruding amount Δt of the protruding portion 32p is reduced is manufactured.

(Fifth embodiment)
Next, a method for manufacturing a crimp connection structure using the terminal crimping apparatus according to the fifth embodiment in the manufacture of the crimp connection structure 1 configured as described above and having a reduced protrusion amount Δt of the protrusion 32p. The terminal crimping method will be described. 13 and 14 are cross-sectional views of a part of the terminal crimping apparatus and the crimping part for explaining the terminal crimping method according to the fifth embodiment.

  As shown in FIG. 13, in the terminal crimping apparatus according to the fifth embodiment, instead of the above-described crimper 301a, the radius of curvature of the contact surface at the part in contact with the crimping part 30 A crimper 303B larger than the curvature radius is used. That is, the radius of curvature of the apex portion of the crimper 303B that contacts the crimping portion 30 is larger than the radius of curvature of the apex portion of the crimper 301a. Accordingly, as shown in FIG. 14, when the crimper 303B descends and crimps the crimping portion 30, the internal force of the barrel component piece 32 generated according to the external force applied to the crimping portion 30 is moved to the outside of the crimper 303B. Acts to escape. Therefore, since the stress acting on the welded portion W1 that is inferior in strength is reduced, the formation of the protruding portion 32p due to this stress can be suppressed, and the protruding amount Δt of the protruding portion 32p can be reduced. As described above, the desired crimped connection structure 1 in which the protruding amount Δt of the protruding portion 32p is reduced is manufactured.

(Sixth embodiment)
Next, the crimp terminal 10 according to the sixth embodiment, which is preferably used for manufacturing the crimp connection structure 1 configured as described above and having the protrusion amount Δt of the protrusion 32p reduced, will be described. FIG. 15 is a cross-sectional view for explaining a crimp terminal 10 according to a sixth embodiment. In the sixth embodiment, the welding width d which is the joining width of the welded portion W1 in the crimping portion 30 of the crimping terminal 10 is made smaller than the conventional welding width, specifically 50 μm or more and 250 μm or less, preferably 150 μm or more. 250 μm or less. Thereby, when the crimping part 30 is crimped to the covered electric wire 200, even if the internal force acting on the welded part W1 increases due to the deformation of the barrel constituent piece 32, the welded part depends on the width d of the welded part W1. The deformation amount of the portion that is deformed from W1 toward the insulating coating 202 side in the inner direction is reduced. As a result, the desired crimped connection structure 1 in which the protruding amount Δt of the protruding portion 32p is reduced is manufactured.

(Seventh embodiment)
Next, a method for manufacturing a crimp connection structure using the terminal crimping apparatus according to the seventh embodiment in the manufacture of the crimp connection structure 1 configured as described above and having a reduced protrusion amount Δt of the protrusion 32p. Will be described. That is, in the seventh embodiment, a friction coefficient reduction process for reducing the friction coefficient between the crimper 301a and the anvil 302a in the terminal crimping apparatus 300 shown in FIG.

  Specifically, a lubricant or the like is supplied between the crimper 301a and the crimping part 30, or between the anvil 302a and the crimping part 30, or the surface of the crimper 301a or the anvil 302a that contacts the crimping part 30 is polished. To do. As a result, the frictional force generated between the crimper 301a or the anvil 302a and the crimping terminal 10 is reduced, so that the external force applied to the crimping part 30 during crimping is not only in the circumferential direction of the crimping part 30 but also in the longitudinal direction X. Is distributed along. And since the external force which acts with respect to the crimping | compression-bonding part 30 at the time of crimping | compression-bonding can be equalize | homogenized in the surface of the crimping | compression-bonding part 30, it can avoid shrinking | contraction of the crimping | compression-bonding part 30 to a specific part. That is, since the stress in the barrel constituent piece 32 generated during the pressure bonding can be suppressed from being concentrated on the welded portion W1 which is a portion that is annealed and has low strength, the amount of protrusion Δt of the protruding portion 32p can be reduced. Thus, the desired crimped connection structure 1 in which the pop-out amount Δt of the pop-out portion 32p is reduced is manufactured.

  According to the embodiment of the present invention described above, a desired crimped connection structure 1 can be manufactured by reducing the amount of protrusion Δt of the protrusion 32p. Therefore, the elastic force of the insulation coating 202 of the covered electric wire 200 in the crimp connection structure 1 can be ensured, and the insulation coating 202 can be prevented from being broken, so that the water stoppage in the crimp connection structure 1 is further improved. Can be made.

  As mentioned above, although embodiment of this invention was described concretely, this invention is not limited to the above-mentioned embodiment, Various deformation | transformation based on the technical idea of this invention is possible. For example, the numerical values given in the above embodiment are merely examples, and different numerical values may be used as necessary.

  For example, in the above-described embodiment, the crimp terminal 10 is formed as a female crimp terminal. However, if the crimp terminal has the crimp part 30, the crimp terminal 10 is crimped with an insertion tab inserted and connected to the box part 20. A male crimp terminal including the portion 30 may be used. Alternatively, a crimp terminal that does not have the box portion 20 or the insertion tab, includes only a plurality of crimp portions 30, inserts the conductors of the plurality of covered wires, and crimps them to connect them together.

  Moreover, in the above-mentioned embodiment, although the opposing end portions 32a are subjected to fiber laser welding along the welded portion W1 in the longitudinal direction X, the opposing end portions 32a are butted against each other on the bottom surface side of the crimping portion 30 and welded. You may do it.

  Further, in the above-described embodiment, the wire locking groove 34 is formed from the crimping surface 31 to the middle of the barrel component piece 32, but continuously within the range from the crimping surface 31 to the barrel component piece 32. It may be formed, and in this case, it is constituted by an annular groove in the crimping part 30.

  In the above-described embodiment, the crimpers 301a and 301b are movable and the anvil 302a is fixed. However, the present invention is not limited to this, and the anvil 302a is movable or the crimpers 301a and 301b are fixed. Is also possible.

DESCRIPTION OF SYMBOLS 1 Crimp connection structure 10 Crimp terminal 20 Box part 21 Elastic contact piece 22 Bottom face part 23 Side face part 30 Crimp part 30a Cover crimping range 30b Electric wire crimping range 30c Sealing part 31 Crimp surface 32 Barrel component piece 32a Opposite end part 32p Projection part 34 Electric wire locking groove 35 Concave sealing part 40 Transition part 200 Coated electric wire 201 Aluminum core wire 201a Electric wire exposed part 201aa tip 202 Insulation coating 202a Coated tip 300 Terminal crimping device 300a Device base 301 Lifting part 301a Crimper 301aa for insulation barrel 301b Wire barrel crimper 302 Anvil installation table 302a Anvil 303A, 303B Crimper 304 Electric wire holding member 305 Guide member 305a Notch 306 Cut holder 307 Holding device 3 8 terminal carrying part W1 weld

Claims (6)

Using the first terminal crimping tooth mold and the second terminal crimping tooth mold, one end portion in the longitudinal direction of the covered electric wire having the conductor portion and the covering portion covering the conductor portion is sealed. And a method of manufacturing a crimp connection structure for crimping to a crimp terminal having a crimp part formed in a hollow cylindrical shape having a welded part along the longitudinal direction,
The crimping part has a covering crimping range for crimping the covering part, an electric wire crimping range for crimping an electric wire exposed from the coated electric wire, and a sealing part in which the one end is sealed,
The welded portion is formed on one side of the crimping portion so that the height changes from the covering crimping range to the sealing portion along the longitudinal direction,
The covered electric wire is inserted from the other end of the crimping part, and the second terminal crimping tooth mold is lowered with respect to the crimping terminal placed on the first terminal crimping tooth mold. wherein when tightening the crimp portion pressing, so as to face the weld on the side of the height of the crimping portion is changed to a mounting surface of said first terminal crimping teeth type Te, the crimp terminal It mounts on the said 1st terminal crimping tooth type. The manufacturing method of the crimping connection structure characterized by the above-mentioned. In the portion between the crimping portion and at least one of the first terminal crimping tooth mold and the second terminal crimping tooth mold, the crimping section and the first terminal crimping tooth mold and the second terminal 2. The method for manufacturing a crimp connection structure according to claim 1, wherein a friction coefficient reduction process for reducing a friction coefficient between at least one of the crimping tooth molds is performed. The crimping according to claim 1 or 2, wherein the following expression (1) is established between an inner diameter D of the crimping portion of the portion into which the covered electric wire is inserted and an outer diameter c of the coated electric wire. A manufacturing method of a connection structure.
0 ≦ (D−c) /c≦0.75 (1) The manufacturing method of the crimp connection structure of any one of Claims 1-3 which performs the process which hardens the said coating | coated part. The manufacturing process of the crimp connection structure of any one of Claims 1-4 which performs the process which apply | coats cured resin to the part corresponding to the said welding part at least of the said coating | coated part in the said covered electric wire. Method. The method for manufacturing a crimp connection structure according to any one of claims 1 to 5, wherein a welding width of the welded portion in the crimping portion is set to 50 µm or more and 250 µm or less.

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