JP3420971B2 - Pressure welding terminal fitting and method of manufacturing pressure welding terminal fitting - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure contact terminal fitting.

[0002]

2. Description of the Related Art A pressure contact metal fitting has a pair of blades, which are bent at a right angle to the inside by cutting and raising from a pair of wall portions and have inward edges facing each other as pressure contact blades. The resin coating of the electric wire is incised by the press contact blade as the electric wire is fitted in, and the opposing end face of the press contact blade is brought into conductive contact with the core wire of the electric wire.

In manufacturing such a pressure contact metal fitting, a plate-like conductive metal plate material having a predetermined thickness is subjected to a plating treatment, and then the metal plate material is punched into a predetermined shape to partially form a wall portion. A blade surrounded by a U-shaped slit is formed, and by bending this flat metal plate material, the wall is raised and the blade is internally bent so that the press contact blades face each other. . At this time,
The facing end surface of the press contact blade which is in contact with the core wire of the electric wire is a fractured surface at the time of punching and therefore is not plated. Since this fracture surface is not smooth, there is a problem in contact reliability if it is directly contacted with the core wire. Therefore,
As the post-plating process, it is generally performed to apply a plating process to the fractured surface (opposite end face), but the post-plating process means an increase in the number of steps, which causes a problem of high cost. .

One example of such a solution is Japanese Patent Laid-Open No. 10-2614.
No. 42 publication. As shown in FIG. 10, this is done by bending the plated surface of the blade 100 other than the fracture surface 101 into an L-shape, and bringing the flat surface 102A outside the bent portion 102 into contact with an electric wire (not shown). The configuration is described.

[0005]

However, in this way L
In the bent shape, since the bent portion 102 is in a cantilevered supporting state, there is a possibility that the bending portion 102 may be deformed inward by the pressing force received from the electric wire side during press contact, and as a result, the resin coating of the electric wire is sufficiently performed. However, there is a possibility that such inconvenience cannot occur, or that even if the incision is made, the contact pressure with the core wire cannot be secured.

The invention of the present application was devised in view of the above circumstances, and it is possible to secure the contact reliability between the pressure contact blade and the electric wire without performing post-plating treatment on the fracture surface generated when the pressure contact edge is formed by punching. Has an aim.

[0007]

According to a first aspect of the present invention, a pair of blades are bent and bent inward at a substantially right angle from a pair of parallel wall portions, and their inward facing edges are pressed against each other. By pressing the electric wire between the pair of blades, the resin coating of the electric wire is incised by the press contact blade, and the opposing end faces of the press contact blade are brought into contact with the core wire of the electric wire. A terminal fitting, which is formed by punching a plated flat metal plate to form the blade that can be bent and bent in a part of the wall, and then bending the wall and the blade. In the one, to form the press contact blade by breaking the bent portion bent in the middle of the blade along the surface of the blade, the bending outside of the bent portion of the blade The Tsu key treated surface, it has a structure in which the said opposing end surfaces to be contacted with the core wire.

According to a second aspect of the present invention, a pair of blades are bent and bent inward at a substantially right angle from a pair of parallel wall portions, and the inward edges facing each other are pressure contact blades. By pressing an electric wire between the pair of blades, the resin coating of the electric wire is incised by the press contact blade, and the facing end surfaces of the press contact blade facing each other are brought into contact with the core wire of the electric wire. In the method of manufacturing, the surface of a flat metal plate material is subjected to a plating treatment, and the metal plate material is punched as it is to form a blade that can be bent and bent in a part of the wall portion, In the one in which the wall portion and the blade are formed into a shape by bending the metal plate material, in the bending step of the metal plate material, the blade is bent and raised substantially at right angles to the wall portion. Bend is formed by bending the blade substantially parallel to the wall portion in its midway, along the bent portion on the surface of the blade forming the inner and and and the wall portion substantially perpendicular bending of the blade To form the press contact blade by breaking, and by bending the pair of wall portions so as to be parallel to each other, the plated outer surface of the bending of the blades as the facing end surfaces capable of contacting the core wire to each other. It was configured to face each other.

[0009]

[Advantages and effects of the invention] [Inventions of claims 1 and 2] One of the corner edges constituting the press-contact blade is a sharp edge portion because it is continuous with the fracture surface along the surface of the blade. Therefore, the resin coating of the electric wire can be surely incised. Further, since the opposing end surfaces of the press contact blade are substantially within the range of the plate thickness of the blade, even if a press force is applied from the wire side during press contact, the press force can be reliably received without being deformed. Moreover, since the facing end surface is used as it is as the plated portion before the punching process, it is possible to secure a highly reliable contact state with the core wire without performing the post-plating processing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 1 and 2, the press-contact terminal fitting 10 of the present embodiment has a pair of wall portions 11 that are parallel to each other, and a pair of blades 12 that are bent and bent inward from both wall portions 11 at a substantially right angle. And the inwardly facing edges of the blades 12 facing each other serve as the pressure contact blades 13. The pressure contact of the electric wire 30 to the pressure contact terminal fitting 10 is performed between the pair of wall portions 11 with the pressure contact terminal fitting 10 assembled in a housing (not shown) or set in a pressure contact jig (not shown). It is performed by dropping the electric wire 30 in a parallel direction onto the upper edge of the blade 12 and pressing the electric wire 30 in this state. By this pressure contact, the resin coating 31 of the electric wire 30 is incised by the pressure contact blade 13 and the pressure contact blade 13
The opposing end surfaces 14 of the electric wires 30 are in contact with the core wire 32 of the electric wire 30.

The manufacturing process of the pressure contact metal fitting 10 will be described. First, in the first process, a flat plate-shaped conductive metal plate (not shown) is plated (not shown), and then the second process is performed. Then, the plate-shaped metal plate material subjected to the plating treatment is punched by a press to form the wall portion 11
A bendable blade 12 is formed on a part of the blade (see FIGS. 3 and 4). Four blades 12 are formed in each of the front and rear pairs, and are formed by punching substantially H-shaped slits in the left and right wall portions 11, respectively. The slit is a lower edge slit 17A that is long in the front-rear direction along the fold line 16 between the bottom plate portion 15 and the wall portion 11, and a wide upper edge slit 17B that is parallel to the lower edge slit 17A.
And a side edge slit 17C connecting between the lower edge slit 17A and the upper edge slit 17B. Plating remains on the surface of the blade 12 (surface flush with the wall portion 11) formed by the slits.
There is no plating on the lower edge surface 12A, the upper edge surface 12B, and the side edge surface 12C (inner peripheral surface of the slit) of the blade 12.

Next, in the third step, the upper edge slit 17 is formed.
B along each fold 18 connecting the front ends and the rear ends of the lower edge slits 17A with each other, the blades 12 are bent and formed substantially at right angles to the wall portion 11 (see FIG. 5), and in the fourth step, The bent blade 12 is bent in the middle thereof to form a bent portion 19 substantially parallel to the wall portion 11 (see FIG. 6). The bending position of the bending portion 19 is determined by the upper edge surface 12B of the blade 12.
Of these, it is a boundary portion between a surface 12B-1 parallel to the lower edge slit 17A and an inclined surface 12B-2. Next, the fifth
In the process, a part of the bent portion 19 is cut into the fracture guide surface 20.
Fracture along (the surface of the blade 12 which is a constituent of the present invention) (see FIG. 7). The breaking guide surface 20
Is a surface inside the bending of the blade 12 and substantially perpendicular to the wall portion 11. The pressure contact blade 13 is formed by this breakage, and a part of the edge portion forming the pressure contact blade 13 becomes the fracture surface 21 where no plating is present. Since the fracture surface 21 faces forward or backward orthogonal to the length direction of the electric wire 30, it does not face the core wire 32 of the electric wire 30. The facing end surface 14 of the press contact blade 13 which is outside the bend and faces the core wire 32 is formed by bending the plated surface of the blade 12, and is left without being cut off by breakage. Since it is the open portion, plating is left on the facing end surface 14 of the press contact blade 13.

Next, in a sixth step, the opposite end surface 14 on which the plating is left is subjected to a tapping process to reduce the protrusion amount of the blade 12 from the wall portion 11 to a predetermined size (see FIG. 8). Finally, in a seventh step, the wall portion 11 is bent so as to rise from the bottom plate portion 15 at a substantially right angle. As a result, the pair of left and right press contact blades 13
However, the inward facing end faces 14 are connected to each other by the core wire 3 of the electric wire 30.
A predetermined interval slightly smaller than 2 is set to correspond to each other (see FIG. 2).

As described above, in the present embodiment, one of the corner edges 13A forming the press contact blade 13 has an inner surface of the bend (breaking guide surface 20) that is substantially perpendicular to the wall portion 11 of the blade 12. Since it is connected to the fracture surface 21 along the edge, it becomes a sharp edge portion, which allows the resin coating 31 of the electric wire 30 to be formed.
Can be surely incised. Further, since the facing end surface 14 of the press contact blade 13 is substantially within the range of the thickness of the blade 12, the blade 12 is pressed from the side of the electric wire 30 during press contact.
Even if a pressing force in the direction along the plate surface is received, the pressing force can be reliably received without deformation. Therefore, the resin coating 31 can be reliably incised.
In addition, since the facing end surface 14 is formed by using the surface of the blade 12 which has been plated before the punching process as it is, a highly reliable contact state with the core wire 32 can be secured without post-plating. .

Further, since the bent portion 19 of the blade 12 is bent toward the side of the opening 11A which is largely vacant in the wall portion 11 due to the bending and bending of the blade 12, the broken piece 19A caused by the breakage is broken. It can be discharged from 11A to the outside. Therefore, the broken pieces 19A do not have to remain between the wall portions 11. [Other Embodiments] The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. Various modifications can be made without departing from the scope of the invention.

(1) In the above embodiment, a pair of front and rear blades are provided so that the fracture surface is located on the rear surface of the front blade and on the front surface of the rear blade. The position of may be reversed to the front and rear of the above embodiment, and both the front and rear blades may be positioned on the front surface, or both the front and rear blades may be positioned on the rear surface.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a pressure contact terminal fitting according to a first embodiment.

FIG. 2 is an enlarged perspective view showing a blade and a pressure contact blade.

FIG. 3 is a plan view showing a wall portion and a blade in a developed state.

FIG. 4 is a partially enlarged perspective view showing the blade in a deployed state.

FIG. 5 is an enlarged perspective view showing a state where the blade is bent and raised from a deployed state.

FIG. 6 is an enlarged perspective view showing a further bent state of the bent and bent blade.

FIG. 7 is an enlarged perspective view showing a state in which a part of the blade is broken.

FIG. 8 is an enlarged perspective view showing a state in which a sizing process is performed after breaking.

FIG. 9 is a partially enlarged cross-sectional view showing a state in which an electric wire is pressure-welded.

FIG. 10 is a partially enlarged perspective view showing a conventional pressure contact blade.

[Explanation of symbols]

10 ... Pressure contact terminal fitting 11 ... Wall 12 ... Blade 13 ... Pressing blade 14 ... Opposing end surface (plating surface) 19 ... Bent 21 ... fracture surface 20: Breaking guide surface (blade surface)

Front Page Continuation (72) Inventor Saito Ning 1-7-10 Kikusumi, Minami-ku, Nagoya, Aichi Prefecture Harness Research Institute Co., Ltd. (56) Reference JP-A-10-261442 (JP, A) JP-A 10-283866 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01R 4/24 H01R 43/16 H01R 4/58 H01R 13/03

Claims (2)

(57) [Claims] 1. A pair of blades are bent and bent inward at a substantially right angle from a pair of parallel wall portions, and their inward facing edges are pressure contact blades, and an electric wire is provided between the pair of blades. Is a press-fitting terminal fitting in which the resin coating of the electric wire is incised by the press-connecting blade and the opposing end faces of the press-connecting blade are brought into contact with the core wire of the electric wire, which is a plated flat plate. After forming a blade that can be bent and bent in a part of the wall portion by punching out a metal plate material in a shape of, and forming the wall portion and the blade by bending, the blade is bent in the middle of the blade. Forming the press contact blade by breaking the bent portion along the surface of the blade, and contacting the core wire with the plated surface outside the bend of the bent portion of the blade. Pressure contact terminal fitting, characterized in that the said opposed end faces to be. 2. A form in which a pair of blades are bent and bent inward from a pair of parallel wall portions at substantially right angles, and the inward edges facing each other are pressure contact blades. By pressing the electric wire between, by cutting the resin coating of the electric wire with the press contact blade, a method for producing a press contact terminal fitting adapted to contact the facing end faces of the press contact blade with the core wire of the electric wire Then, the surface of the flat metal plate material is plated, and the metal plate material is punched as it is to form the blade that can be bent and bent in a part of the wall portion, and the metal plate material is bent. In forming the wall portion and the blade into the form by processing, in the bending step of the metal plate material, the blade is bent and raised substantially at right angles to the wall portion, and the blade The bent portion is formed by bending substantially in parallel to the wall portion in its middle, to break along the bent portion on the surface of the blade forming the inner and and and the wall portion substantially perpendicular bending of the blade By forming the press contact blade by bending the pair of wall portions to be parallel to each other, the plating treatment surfaces outside the bending of the blades are opposed to each other as the facing end surfaces capable of contacting the core wire. A method of manufacturing a pressure contact terminal fitting, comprising: