JP2015082429A - Terminal connection device and method of manufacturing wire with terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect a terminal and a wire while suppressing the occurrence of burr as much as possible.SOLUTION: In a terminal connection device for connecting a terminal to a wire by caulking a wire connection part of the terminal externally fitted to the wire so that the wire connection part has a polygonal cross section, notches for molding which have a shape obtained by dividing the polygonal cross section into two are formed from surfaces to be mated of a pair of die bodies to be butted are formed on the die bodies, and an inner peripheral surface of each notch for molding includes a compression surface extending to a bottom of the notch for molding, a first slope extending from one end of the compression surface toward the surface to be mated, a second slope extending from the other end of the compression surface toward the surface to be mated, a first pressing projection formed on the compression surface, and second pressing projections formed on the first and second slopes respectively. The first and second pressing projections are formed so that, when the pair of die bodies are butted against each other, the second pressing projections come into contact with an outer peripheral surface of the wire connection part disposed in the notches for molding before the first pressing projection does.

Description

  The present invention relates to a terminal connection device for connecting a terminal to a conductor exposed portion of an electric wire and a method for manufacturing a terminal-attached electric wire.

  As a terminal connection device for attaching a terminal having a substantially cylindrical wire connection part to a conductor exposed part of an electric wire, a hexagonal cross section is bisected from a butt surface of these die bodies into a pair of die bodies to be abutted with each other It is known that notches (recesses) having the above shapes are formed, and further, pressing protrusions are formed on the inner wall surfaces of the notches (see Patent Document 1).

  In patent document 1, the electric wire connection part of the terminal externally fitted to the conductor exposed part of the electric wire is set in the notch of the die body, the pair of die main bodies are butted together, and the electric wire connection part is crimped into a hexagonal cross section. By connecting the terminal to the electric wire. And the external force added to caulking is concentrated on the contact portion between the outer peripheral surface of the electric wire connecting portion and the pressing projection, thereby improving the connection strength between the terminal and the electric wire.

JP 2000-21543 A

  As in Patent Document 1, the connection strength between the electric wire and the terminal can be improved by caulking the electric wire connection portion using a die main body in which a pressing protrusion is formed on the inner wall surface of the notch. At the time of butting, the portion where the electric wire connecting portion is crushed by the pressing protrusion is pushed out toward the gap of the butting surface of the die body, and there is a possibility that a large burr is generated.

  An object of the present invention is to provide a terminal connection device and a method of manufacturing a terminal-attached electric wire that can solve the above-described problems caused by the prior art and connect the electric wire and the terminal while minimizing the occurrence of burrs. .

  A terminal connection device according to the present invention is a method of connecting a terminal to a wire by crimping a wire connection portion of a terminal externally fitted to the wire into a polygonal cross section. In addition, molding notches each having a shape that bisects a polygonal cross section from the butting surfaces of these die bodies are formed, and the inner peripheral surface of each of the molding notches is a compression surface that extends to the bottom of the molding notch A first slope extending from one end of the compression surface toward the butting surface, a second slope extending from the other end of the compression surface toward the butting surface, and a first slope formed on the compression surface The pressing protrusions and second pressing protrusions formed on the first and second inclined surfaces, respectively, and disposed in the molding notch when the pair of die bodies are brought into contact with each other. On the outer peripheral surface of the wire connection part, As the pressing projections abut earlier than the first pressing protrusion, wherein the first and second pressing protrusion is formed.

  According to the terminal connecting device according to the present invention, when the wire connecting portion is caulked, the first pressing protrusion formed on the compression surface of the molding notch comes into contact with the outer peripheral surface of the wire connecting portion. The second pressing protrusions formed on the first and second inclined surfaces abut on the outer peripheral surface of the wire connecting portion. As a result, the portion that is crushed by the first pressing protrusion is pushed out toward the abutting surface of the die body at the contact portion with the second pressing protrusion, thereby reducing the occurrence of burrs. it can.

  In the terminal connection device, the first and second pressing protrusions extending in the longitudinal direction along the axial direction of the inner peripheral surface are formed on the inner peripheral surface of each molding notch. The length of the two pressing protrusions in the axial direction may be longer than that of the first pressing protrusion.

  By making the length of the second pressing protrusion in the axial direction longer than that of the first pressing protrusion, it is possible to suppress the generation of burrs over the entire wire connection portion.

  The manufacturing method of the electric wire with a terminal concerning the present invention includes the step of externally fitting a cylindrical electric wire connecting portion of the terminal to the conductor exposed portion of the electric wire, and the electric wire connecting portion between a pair of die bodies that are faced to each other. A step of arranging and a pair of die bodies each formed with a molding notch having a shape that bisects the cross-section polygon from the abutting surface of each die body, so that the wire connection portion is formed of the molding notch. The inner peripheral surface of each molding notch includes a compression surface extending to the bottom of the molding notch and a die from one end of the compression surface. A first inclined surface extending toward the butting surface of the main body, a second inclined surface extending from the other end of the compression surface toward the butting surface of the die body, and a first pressing protrusion formed on the compression surface; On the first and second slopes, respectively A second pressing projection formed, and when the wire connecting portion is caulked to match the shape of the molding notch by abutting the pair of die bodies, the second pressing projection is the second pressing projection. It contacts the said electric wire connection part ahead of 1 press protrusion.

  According to the method of manufacturing a terminal-attached electric wire according to the present invention, the portion crushed by the first pressing protrusion is pushed toward the abutting surface of the die body at the contact portion with the second pressing protrusion. It is possible to manufacture a terminal-attached electric wire that is regulated and the generation of burrs is suppressed.

  According to the present invention, it is possible to connect the electric wire and the terminal while suppressing the generation of burrs as much as possible.

It is the perspective view and sectional drawing which show the electric wire with a terminal manufactured using the terminal connection apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the die main body of the terminal connection apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the other example of the electric wire with a terminal.

  Hereinafter, with reference to drawings, a terminal connecting device and a manufacturing method of an electric wire with a terminal concerning an embodiment of the present invention are explained.

1A and 1B are diagrams showing a terminal-attached electric wire manufactured using a terminal connection device according to an embodiment of the present invention. FIG. 1A is an external perspective view, and FIG. It is AA 'line sectional drawing of.
As shown in FIG. 1 (a), the terminal 10 is made of a substantially cylindrical metal member, and a cylindrical terminal connection portion 11 for connecting to a counterpart connection terminal is formed on the front end side, and on the rear end side, A cylindrical wire connecting portion 12 for connecting to the wire is formed.

As shown in FIG. 1B, the wire connecting portion 12 of the terminal 10 is fitted on the conductor exposed portion 14 exposed at the tip of the wire 13. And the electric wire 13 and the terminal 10 are couple | bonded by crimping the electric wire connection part 12 externally fitted by the conductor exposed part 14 so that it may become a cross-sectional hexagonal shape.
Note that first and second concave portions 15 and 16 that are recessed in a curved shape are compression-formed on each of the six surfaces of the wire connection portion 12 that is crimped into a hexagonal cross section.

  FIG. 2 is a diagram for explaining a terminal connection device according to an embodiment of the present invention and a method of manufacturing a terminal-attached electric wire using the terminal connection device, and the electric wire connection part 12 of the terminal fitted on the conductor exposed part 14 of the electric wire. It is sectional drawing of a pair of die main body which caulks. FIGS. 2A to 2B show a state in which a pair of die bodies are butted together and the electric wire connection portion of the terminal is caulked over time.

As shown in FIG. 2 (a), a terminal connection device according to an embodiment of the present invention has a pair of upper and lower die bodies 21 and 22 that are faced to each other. Forming notches 21b and 22b having a shape obtained by dividing the square into two equal parts are formed.
The inner peripheral surfaces of the molding notches 21b and 22b are located at the bottom of the molding notches, and are compressed surfaces 31 and 34 extending so as to face each other when the upper and lower die bodies 21 and 22 are brought into contact with each other. The first inclined surfaces 32 and 35 extend from one end of the compression surface toward the abutting surface, and the second inclined surfaces 33 and 36 extend from the other end of the compression surface toward the abutting surface.
In addition, each compression surface 31, 34 is formed with a first pressing projection 18 projecting in a circular arc shape at the center thereof, and each of the first and second inclined surfaces 32, 33, 35, 36 includes A second pressing projection 19 that protrudes in a circular arc shape is formed at a position slightly beyond the center from the abutting surfaces 21a and 22a.

The first pressing projection 18 has a projection height (height from each compression surface 31, 34 to the projection top) L1, and the projection height of the second pressing projection 19 (each slope 32, 33, 35, (The height from 36 to the top of the projection) L2 is formed to be higher than L2.
Further, as shown in FIG. 2B, the first and second pressing protrusions 18 and 19 are used for the first pressing when the electric wire connecting portion 12 is caulked by abutting the pair of upper and lower die bodies 21 and 22. Prior to the protrusion 18, the second pressing protrusion 19 is formed so as to contact the outer periphery of the wire connection portion 12.

  For this reason, when the compression is further advanced from the state of FIG. 2B, as shown in FIG. 2C, the contact portion with the second pressing protrusion 19 is first crushed and deformed to be recessed inward. Thus, the second pressing portion 18 formed on each compression surface 31 is in contact with the outer peripheral surface of the wire connection portion 12 while the second recess 16 is formed in the wire connection portion 12.

  When the compression is further advanced from this state, the electric wire connecting portion 12 is crushed by the first pressing protrusion 18 to form the first concave portion 15 on the outer peripheral surface, and as shown in FIG. It is caulked into a substantially hexagonal cross section. At this time, the portion that is crushed and deformed by the first pressing protrusions 18 formed on the compression surfaces 31 and 34 is about to be pushed toward the abutting surfaces 21a and 22a. The deformation toward the abutting surfaces 21 a and 22 a is restricted by the second pressing protrusion 19 in contact with the outer peripheral surface, and is pushed into the region between the first pressing protrusion 18 and the second pressing protrusion 19. Since it is deformed and compressed into a hexagonal cross section, as shown in FIG. 2D, when the pair of upper and lower die bodies 21 and 22 are pressed against each other and compressed, the occurrence of burrs in the wire connecting portion 12 can be suppressed.

FIG. 3 is a perspective view illustrating an example of a terminal-attached electric wire manufactured in another embodiment.
In the electric wire with terminal shown in FIG. 3, the electric wire connecting portion 12 of the terminal 10 that is externally fitted to the conductor exposed portion 14 exposed at the tip of the electric wire 13 is caulked in a hexagonal cross section similarly to the electric wire with terminal shown in FIG. 1. ing.
And although 1st and 2nd recessed part 15 ', 16' is each formed on six planes of the outer peripheral surface of the electric wire connection part 12 which comprises cross-sectional hexagonal shape, the axial direction of 1st recessed part 15 ' Is shorter than the axial length of the second recess 16 '.

  That is, in the terminal connecting device for manufacturing the electric wire with terminal shown in FIG. 3, the upper and lower die bodies 21, 22 are formed on the compression surfaces 31, 34 on the inner peripheral surfaces of the molding notches 21b, 22b. The first pressing protrusion 18 and the second pressing protrusion 19 formed on the first and second inclined surfaces 32, 35, 33, 36 are, for example, the axial length of the first pressing protrusion 18 is The two pressing protrusions 19 are configured to be shorter than the axial length.

If it does in this way, when crimping the electric wire connection part 12 of the terminal 10 externally fitted to the conductor exposed part 14 of an electric wire, it is from the range of the axial direction of the electric wire connection part 12 crushed by the 1st press protrusion 18 However, since the second pressing protrusion 19 is larger than the range in the axial direction of the wire connecting portion 12 in contact, the portion crushed by the first pressing protrusion 18 is pushed out toward the abutting surfaces 21a and 22a. Is reliably regulated, and the occurrence of burrs can be suppressed over the entire wire connecting portion 12.
In addition, although the electric wire with a terminal shown in FIG.1 and FIG.3 is all the wire connection part 12 being crimped by the cross-sectional hexagon shape, the crimping shape of the wire connection part 12 is not limited to a hexagon. There may be other polygons, such as an octagon.

DESCRIPTION OF SYMBOLS 10 Terminal 11 Terminal connection part 12 Electric wire connection part 13 Electric wire 14 Conductor exposure part 15, 15 '1st recessed part 16, 16' 2nd recessed part 18 1st press protrusion 19 2nd press protrusion 21, 22 Die body 21a , 22a Butting surface 21b, 22b Molding notch 31, 34 Compression surface 32, 35 First slope 33, 36 Second slope

If it does in this way, when crimping the electric wire connection part 12 of the terminal 10 externally fitted to the conductor exposed part 14 of an electric wire, it is from the range of the axial direction of the electric wire connection part 12 crushed by the 1st press protrusion 18 However, since the range of the axial direction of the electric wire connection part 12 with which the 2nd press protrusion 19 is contacting is larger, the site | part crushed by the 1st press protrusion 18 is extruded toward the abutting surfaces 21a and 22a. Therefore, the occurrence of burrs can be suppressed over the entire wire connecting portion 12.
In addition, although the electric wire with a terminal shown in FIG.1 and FIG.3 is all the wire connection part 12 being crimped by the cross-sectional hexagon shape, the crimping shape of the wire connection part 12 is not limited to a hexagon. There may be other polygons, such as an octagon.

Claims (3)

In the terminal connection device for connecting the terminal to the electric wire by caulking the electric wire connection portion of the terminal fitted on the electric wire into a polygonal cross section,
A pair of die bodies that are abutted against each other are formed with molding notches each having a shape that bisects the polygonal section from the abutment surface of these die bodies,
The inner peripheral surface of each molding notch includes a compression surface extending to the bottom of the molding notch, a first inclined surface extending from one end of the compression surface toward the abutting surface, and the compression surface. A second inclined surface extending from the other end toward the abutting surface, a first pressing projection formed on the compression surface, and a second pressing projection formed on each of the first and second inclined surfaces. Have
When the pair of die bodies are brought into contact with each other, the second pressing protrusion comes into contact with the outer peripheral surface of the electric wire connecting portion disposed in the molding notch before the first pressing protrusion. The terminal connection device is characterized in that the first and second pressing protrusions are formed.   First and second pressing protrusions extending in the longitudinal direction along the axial direction of the inner peripheral surface are formed on the inner peripheral surface of each molding notch, and the shaft of the second pressing protrusion is formed. The terminal connection device according to claim 1, wherein a length in a direction is longer than that of the first pressing protrusion. A step of externally fitting a cylindrical wire connecting portion of the terminal to the conductor exposed portion of the wire;
Arranging the wire connecting portion between a pair of die bodies that are faced to each other;
The wire connecting portion is caulked in accordance with the shape of the notch for molding by butting a pair of die bodies each formed with a molding notch having a shape that bisects the polygonal section from the abutment surface of each die body. And connecting the terminal to the electric wire,
The inner peripheral surface of each of the molding notches includes a compression surface extending to the bottom of the molding notch, a first inclined surface extending from one end of the compression surface toward the butting surface of the die body, and the compression surface. A second inclined surface extending from the other end of the die body toward the abutting surface of the die body, a first pressing protrusion formed on the compression surface, and a second pressing formed on each of the first and second inclined surfaces. With protrusions,
When the pair of dies body is abutted and the electric wire connecting portion is caulked in accordance with the shape of the notch for molding, the second pressing protrusion is placed on the electric wire connecting portion before the first pressing protrusion. A method of manufacturing an electric wire with a terminal, wherein the contact is made.

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