JP2010049897A - Manufacturing method of terminal metal fitting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent variation of dimensions of a wire crimping part caused by press working. <P>SOLUTION: At the wire crimping part 14 of a metal plate material 11 of a flat-plate shape, a relief part 18 of a notched shape is formed with a part to be penetrated in a plate thickness direction so as to have a condition that an outer edge of the wire crimping part 14 is regulated from being displaced into a direction perpendicular to the plate thickness direction, and a press process is carried out to form a recess part 17 by partially recessing a contact surface with an electric wire 20 at the wire crimping part 14 with press working. In the press process, an excess portion 19 of the wire crimping part 14 generated by forming of the concave part 17 is released in the relief part 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a terminal fitting.

Patent Document 1 discloses a terminal fitting including an electric wire crimping portion for connecting electric wires by crimping. In this terminal fitting, a structure is adopted in which a concave portion is formed on a contact surface of the electric wire crimping portion with the electric wire, and the concave portion is hooked on the outer periphery of the electric wire, thereby increasing the fixing force with the electric wire.
Japanese Patent Laid-Open No. 2006-1000028

The terminal fitting is manufactured by subjecting a flat metal plate material punched into a predetermined shape to bending or pressing. When forming the recess, the flat metal plate material is subjected to press processing for locally denting the surface of the wire crimping portion. In this pressing step, the volume corresponding to the volume of the recess is provided. However, there is a concern that the shape of the outer edge of the wire crimping portion changes, and that the dimension in the axial direction and the dimension in the circumferential direction of the wire crimping part vary.
This invention is completed based on the above situations, Comprising: It aims at preventing the variation in the dimension of the wire crimping part resulting from press work.

  As means for achieving the above object, the invention according to claim 1 is a punching step for obtaining a flat metal plate in which an open barrel-shaped electric wire crimping portion is formed, and the electric wire is applied to the flat metal plate. A method of manufacturing a terminal fitting including a pressing step for forming a recess in a form in which a contact surface with a wire in a crimping portion is locally recessed, and a part of the wire crimping portion is penetrated in a plate thickness direction. After forming the relief part of the notched form, the pressing step is performed in a state where the outer edge of the wire crimping part is restricted from being displaced in a direction perpendicular to the plate thickness direction. The present invention is characterized in that surplus meat of the electric wire crimping portion generated with the formation of the concave portion is allowed to escape into the escape portion.

  The invention of claim 2 is characterized in that, in the invention of claim 1, the relief portion is cut out so as to open to the outer edge of the wire crimping portion.

<Invention of Claim 1>
Press in a state in which a relief part is formed in the wire crimping part so that a part of the wire crimping part is cut through in the thickness direction and the outer edge of the wire crimping part is restricted from being displaced in a direction perpendicular to the thickness direction. In this pressing step, since the surplus meat of the wire crimping portion generated with the formation of the recess is allowed to escape into the escape portion, the shape of the outer edge of the wire crimping portion does not change. Therefore, variation in the dimensions of the wire crimping portion due to the press working is prevented.

<Invention of Claim 2>
In the present invention in which the relief portion is cut out so as to open to the outer edge of the wire crimping portion, excess meat is more easily escaped in the pressing process than the window hole-like relief portion whose opening edge is closed over the entire circumference. It has become.

<Embodiment 1>
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 7. The terminal fitting 10 according to the first embodiment is manufactured by bending or pressing a metal plate 11 having a constant thickness punched into a predetermined shape as shown in FIGS. 1 and 2. is there. The terminal fitting 10 is elongated in the front-rear direction as a whole, and the front end side portion of the terminal fitting 10 is an elongated tab portion 12 for connecting to a female counterpart terminal (not shown). The central portion is a box-shaped portion 13. The rear end portion of the terminal fitting 10 is an electric wire crimping portion 14 having an open barrel shape for crimping and connecting the front end portion of the electric wire 20.

  The electric wire crimping portion 14 includes a wire barrel portion 15 formed in the front end side region and an insulation barrel portion 16 formed in the rear end side region (behind the wire barrel portion 15). The wire barrel portion 15 has a form in which a pair of caulking pieces 15B are raised symmetrically from the left and right side edges of the bottom wall 15A. The front end portion of the conductor 21 of the electric wire 20 is connected to the wire barrel portion 15 by crimping. It is designed to be connected as possible. At the time of crimping, the crimping piece 15B is deformed and wound around the conductor 21 placed on the surface of the bottom wall 15A of the wire barrel part 15, so that the conductor 21 is surrounded by the wire barrel part 15. The insulation barrel portion 16 has a form in which a pair of caulking pieces 16 </ b> B are raised from the bottom wall 16 </ b> A continuous with the bottom wall 15 </ b> A of the wire barrel portion 15. A portion of the front end portion of the electric wire 20 covered with the insulating coating 22 is fixed to the insulation barrel portion 16 by crimping in the same manner as the wire barrel portion 15.

  On the surface of the wire barrel portion 15 (the surface in contact with the conductor 21), a plurality of grooves (in this embodiment, 3 in this embodiment) extending in the circumferential direction (in the state of the metal plate 11 in which the terminal fitting 10 is deployed, the left-right direction) are formed. Although it is a book, the number of the recesses 17 may be two or less, or four or more. The recesses 17 are formed at regular intervals in the front-rear direction (axial direction). The range in which the concave portion 17 is formed in the left-right direction extends from the position near the rising edge of one caulking piece 15B to the position near the rising edge of the other caulking piece 15B across the bottom wall 15A of the wire barrel 15 It has become. In a state where the conductor 21 is pressure-bonded to the wire barrel portion 15, the edge portion of the groove-shaped recess portion 17 is caught on the outer periphery of the conductor 21, thereby increasing the adhesion force between the conductor 21 and the wire barrel portion 15.

  When forming the recess 17, the metal plate material 11 punched into a predetermined shape is placed on the receiving base 30 with the wire barrel portion 15 of the metal plate material 11 and pressed from above as shown in FIGS. 3 and 4. Pressure is applied by the machine 31 and the surface of the wire barrel part 15 is locally recessed by a rib-shaped forming part 32 provided on the lower surface of the press machine 31. In this pressing step, the lower surface of the press machine 31 presses the surface of the wire barrel portion 15, so that the plate thickness of the region other than the concave portion 17 in the wire barrel portion 15 is kept constant. Therefore, surplus meat 19 corresponding to the volume of the concave portion 17 of the meat constituting the wire barrel portion 15 tends to escape to the outer edge side of the crimping piece 15B. When the surplus meat 19 of the wire barrel part 15 escapes to the outer edge side of the crimping piece 15B, the shape of the outer edge of the crimping piece 15B changes, and as a result, the rising dimension of the crimping piece 15B (in the state of the metal plate 11 in the horizontal direction) (Width dimension) and the size in the front-rear direction of the caulking piece 15B is likely to vary.

  As countermeasures, in the present embodiment, the following countermeasures are taken. First, in the metal plate 11, when the punched piece 15B is punched into a predetermined shape, a pair of relief portions 18 in a form in which the rising edges of the caulking pieces 15B (left and right side edges in the state of the metal plate 11) are cut into a square shape are symmetrically paired. Is formed. The escape portion 18 has a shape that penetrates the crimping piece 15B from the front surface side to the back surface side and is opened at the rising edge of the crimping piece 15B. Further, the escape portion 18 is arranged at the center position of the rising edge of the crimping piece 15B in the front-rear direction, and the arrangement region of the escape portion 18 corresponds to the formation position of the central recess portion 17.

  Further, as a measure for preventing the dimensional variation of the crimping piece 15B, at the time of press working, the regulating member 33 is brought into contact with the outer edge of the crimping piece 15B placed on the cradle 30. The outer edge of the piece 15B is restricted from moving outward. The restricting member 33 is in contact with the entire area of the front edge, the entire area of the rear edge, and the area other than the escape portion 18 (area on both front and rear sides) of the left and right side edges. In a state where the regulating member 33 is in contact with the outer edge of the crimping piece 15B, the upper surface of the regulating member 33 is the same height as the upper surface (front surface) of the wire barrel portion 15 (the crimping piece 15B). Further, the lower surface of the press machine 31 presses not only the upper surface of the wire barrel portion 15 but also the upper surface of the regulating member 33 in a surface contact state.

  When the preparation is completed in this way, press working by the press machine 31 is performed. In the pressing process, the molding part 32 bites into the wire barrel part 15 to form the recess 17 and the lower surface of the press machine 31 presses the upper surface of the wire barrel part 15 to keep the wire barrel part 15 at a predetermined plate thickness. Therefore, the surplus meat 19 of the wire barrel portion 15 generated with the formation of the concave portion 17 tends to escape to the outer edge side of the crimping piece 15B. At this time, the outer edge of the caulking piece 15B is restricted from being displaced outward by the restricting member 33, but the relief recesses 17 are formed in the left and right side edges of the caulking piece 15B, and therefore, as shown in FIG. Thus, the surplus meat 19 can escape to the internal space of the escape portion 18. Thereby, the outer edge of the crimping piece 15B is maintained in a predetermined shape, and the horizontal dimension and the front-rear dimension of the crimping piece 15B are maintained at predetermined dimensions. According to this embodiment, the variation in the dimension of the wire barrel part 15 resulting from press work is prevented.

  Moreover, since the relief part 18 of this embodiment is made into the form notched so that it may open to the standing | starting edge (right-and-left both sides edge) of the crimping piece 15B, ie, the outer edge of the electric wire crimping part 14, an opening edge is in a perimeter. The surplus meat 19 is more easily escaped in the pressing process than the window hole-like escape portion closed over.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the concave portion is formed only in the wire barrel portion of the wire crimping portion. However, in the present invention, the concave portion is formed in both the barrel portion of the wire barrel portion and the insulation barrel portion, or the concave portion is insulated. The present invention can also be applied to the case where it is formed only on the modulation barrel portion.
(2) In the above embodiment, the displacement of the outer edge of the wire crimping portion is regulated in both the axial direction and the circumferential direction. However, the direction of regulating the displacement of the outer edge of the wire crimping portion may be only the axial direction or just the circumferential direction. Good.
(3) In the above embodiment, the relief portion is opened at the outer edge of the electric wire crimping portion. However, according to the present invention, the escape portion does not open at the outer edge of the electric wire crimping portion, and the opening hole is closed. It may be a shape.
(4) In the above embodiment, the escape portion is opened at the rising edge of the caulking piece. However, according to the present invention, the escape portion is opened at the front edge or the rear edge along the rising direction of the caulking piece. It may be.
(5) Although the case where the concave portion has a groove shape has been described in the above embodiment, the present invention can be applied even when the concave portion has a shape other than the groove shape.
(6) Although the example applied to the male terminal fitting has been described in the above embodiment, the present invention can also be applied to a female terminal fitting.

The top view showing the state before giving press processing to a metal plate material in Embodiment 1. Plan view showing the state after pressing metal plate XX sectional view of FIG. Cross-sectional view showing the pressing process Plan view of terminal fittings showing the state before crimping the wires Sectional view of terminal fittings showing the state before crimping the wires Side view showing the state where wires are crimped to terminal fittings

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Terminal metal fitting 11 ... Metal plate material 14 ... Electric wire crimping part 17 ... Recessed part 18 ... Escape part 19 ... Excess meat

Claims (2)

A punching process for obtaining a flat metal plate material on which an open barrel-shaped wire crimping portion is formed,
A method of manufacturing a terminal fitting including a pressing step of forming a concave portion in which the contact surface with the electric wire in the electric wire crimping portion is locally depressed in the flat metal plate material,
On the wire crimping part, after forming a relief part in the form of notching so as to penetrate part of the wire in the plate thickness direction,
In the state where the outer edge of the wire crimping portion is restricted from being displaced in a direction perpendicular to the plate thickness direction, the pressing step is performed,
In the pressing step, a surplus meat of the electric wire crimping portion generated with the formation of the concave portion is allowed to escape into the escape portion.   The method for manufacturing a terminal fitting according to claim 1, wherein the relief portion is cut out so as to open at an outer edge of the wire crimping portion.

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