JP2000150103A - Pressure contact mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a barrel caulking part of a pressure contact mold for pressure contact and pressure fitting simultaneously, from interfering with a cavity partition inclined by pressing a barrel caulked with pressure fitting of a neighbored electric wire. SOLUTION: A lower surface of a barrel caulking part 4 of a metal-mold 10 is curved along a peripheral surface of an electric wire 50 so as to efficiently stand a pressed barrel 43 along an outer surface of the electric wire 50, and cut-outs 6 are disposed sequently on both side surfaces. A pressing surface 5 of the barrel caulking part 4 and its neighbour are subject to nitriding, and the surfaces are cured so as to increase pressure and durability. Even if the mold 10 descends, and the pressing surface 5 of the barrel caulking part 4 of its lower end abuts on a tip of a barrel 43 of a terminal 40, and the barrel caulking part 4 presses the barrel 43; the cutouts 6 are present. Accordingly, the barrel caulking part 4 is not interferred by a cavity partition 33a inclined when the neighboring electric wire 50 is subject to pressure fit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press mold.

[0002]

2. Description of the Related Art Automobile wire harnesses include, for example,
As shown in FIG. 5, electric wires 50 in which a conductor 51 is insulated and covered with a resin 52 are arranged in parallel, and a connector 30 is connected to an appropriate position in a length direction and a width direction thereof. It is covered.

As a means for connecting the electric wire 50 to the connector 30, a press contact connection (hereinafter simply referred to as press contact) shown in FIGS. 6 and 7 is being adopted from the viewpoint of workability.

[0004] As shown in FIG.
The press-contact blade 7 corresponding to 0 is lowered by a press-contact blade holder (not shown), and these electric wires 50 are pressed into the slots 41 of the press-contact terminals 40 of the connector 30 by the distal end surface of the press-contact blade 7.
At this time, the terminal 40 is sandwiched and connected by the spring back of the side wall 42 of the slot deformed at this time, and at this press-fitting, the coating resin 52 of the electric wire 50 is peeled off by friction with the side wall 42 of the slot. The coating resin 5
The conductor 51 in 2 contacts the side wall 42, and electrical conduction between the conductor 51 and the press contact terminal 40 is enabled.

As shown in FIG. 8, some of the press contact terminals 40 have a barrel 43 for crimping and fixing an electric wire 50 in the terminal 40 separately from the press contact.

FIG. 9 shows an example of a connection mold 10 for connecting an electric wire 50 to the terminal 40. FIG.
Shows the state of use thereof, and has a barrel caulking portion 4 for crimping the barrel 43 and crimping the electric wire 50 to the terminal 40 together with the press-contact blade 7 at the front and rear, so that the crimping and crimping are performed simultaneously. I have. In the figure, 30 is a connector, 32 is a cavity, 40 is a terminal, 43 is its barrel, 50 is an electric wire, and 10 is a mold. The figure depicts the tip of the mold 10, which is mounted on a press-contact blade holder (not shown) and moved up and down at the omitted upper part. The barrel caulking portion 4 is on the front side of the mold 10 in the figure, and the pressure contact portion 3 is the rear side thereof.
The press-contact portion 3 has two press-contact blades 7, 7 arranged in front and behind. The figure shows a state at the time when the barrel caulking portion 4 comes into contact with the distal end surface of the barrel 43 and the caulking action starts.

[0007]

In the case of the above-mentioned press-contact mold 10, there is the following problem shown in FIG. That is, the barrel crimping portion 4 causes the curved surface (pressing portion) 5 on the lower surface to press the tip of the barrel 43, and secures the barrel 43 to the electric wire 5 in order to secure the fixing force of the electric wire 50 to the terminal.
As it is swaged around 0,
The barrel 43 deforms so as to form an arc bulging outward from an upright state before being caulked. At this time, the outer surface of the barrel 43 presses the side wall 33 of the cavity facing the same, so that the side wall 33 is inclined toward the adjacent cavity 32.

Therefore, when the adjacent barrel caulking portion 4 comes down from above the inclined side wall 33, it interferes with the side wall 33 and the side wall 33 is cut off.
In some cases, the side wall 33 may be broken from the root.

At this time, since the mold 10 receives resistance from the side wall 33, if the resistance is large, the mold 10
Does not descend smoothly, the swaging strength is weakened, and the swaging condition varies depending on the position.

[0010] The existence of such inconvenience demands a further reduction in size and an increase in the density of the installed wires.
This is a particularly serious problem in today's connector specifications, in which the arrangement pitch is reduced, the extra space in the width direction of the cavity 32 is lost, and the thickness of the side wall 33 is becoming thinner. The smaller thickness of the side wall 33 means that, as described above, when caulking, the adjacent cavity 32
In addition, when the barrel 10 is pressed by the barrel caulking portion 4 of the mold 10, it easily breaks.

Therefore, the object of the present invention is not limited to the above-mentioned one for both pressure welding and crimping, and the target work is not limited to the above-mentioned wire harness for automobiles. The object of the present invention is to make it possible to smoothly perform crimping of an electric wire without damaging a side wall of a cavity.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a part of a mold, which enters the cavity and crimps a barrel, on the adjacent side where the crimped barrel is pressed and inclined. The cutout was shaped so as not to interfere with the side wall of the cavity.

With this configuration, the connector is not damaged. Further, since the mold descends smoothly without receiving the resistance, there is no loss of the pressing force to the barrel, the caulking is effectively performed, and the connection strength of the electric wire to the connector increases.

In the above invention, if the surface of the mold facing the electric wire is a curved surface along the peripheral surface of the electric wire, each of the barrels on both sides of the electric wire effectively faces the outer surface of the electric wire along the curved surface. Since the caulking is performed while being worn, the connection strength of the electric wire to the connector also increases in this case.

Further, if a surface hardening treatment is applied to a contact portion of the mold with the barrel tip surface to harden the surface, the durability of the mold is increased, and the barrel can be strongly and smoothly bent.
The bending condition is stabilized.

Further, when the molds having the above-described configurations are used, even when the press-contact blade is provided in parallel with the press-contact and the press-bonding, the press-bonding operation does not interfere with the side wall of the adjacent cavity as described above. Since the press-contact blade descends smoothly without the mold receiving resistance, the pressing force of the press-contact blade is transmitted to the electric wire as it is, so that good press-contact can be performed.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; FIG. 1 to 4 show a mold 10 according to the embodiment. This is a specification having a barrel caulking portion 4 and a pressure contact blade 7 so that pressure contact and pressure bonding can be performed simultaneously.

FIG. 1 shows a side view and a front view of the mold 10 including a partial cross section. The upper rectangular parallelepiped portion is attached to a press-contact blade holder (not shown) by screwing. This is a part 1 in which a stepped mounting hole 2 is provided. A plate-shaped portion connected to the lower surface of the mounting portion 1 serves as a press-contact portion 3 for press-contact and a barrel caulking portion 4 for press-fitting. FIG.
FIG. 4 is a partially enlarged view of a barrel caulking portion 4.

Since the lower surface 5 of the barrel crimping portion 4 presses the barrel tip surface at this portion, as shown in (c) and (d) of FIG. It has a curved surface along the circumference. Notches 6 are provided on both sides of the barrel caulking portion 4 before and after. Furthermore, this barrel caulking part 4
The pressing surface and its vicinity are subjected to nitriding treatment to harden the surface. This is a process for increasing the pressing force of the mold 10 and increasing the durability.

FIGS. 3 and 4 show a state in which the barrel is pressed and caulked by the barrel caulking portion 4 provided with the notch 6 as described above, and the electric wire is crimped to the terminal. FIG. 3 shows the state of use, in which the mold 10 descends and the pressing surface 5 of the barrel caulking portion 4 at the lower end thereof is connected to the barrel 4 of the terminal 40.
3 shows a state at the time of starting contact with the front end of No. 3.

By using the mold 10 of this embodiment, FIG.
As shown in (a), the mold 10 descends, and (b)
Even when the barrel caulking portion 4 presses the barrel 43 as shown in FIG. 7, since the notch 6 exists, the side wall 3 of the cavity inclined when the electric wire 50 on the left is crimped.
The caulking part 4 does not interfere with 3a.

As described above, since the pressing surface 5 and the vicinity thereof are subjected to the nitriding treatment and the portions are hardened, the barrel 43 is strongly bent along the curved surface of the pressing surface 5, and the bending is smooth. It is performed. Therefore, the connection strength of the wire 50 to be crimped to the terminal 40 is also increased, and the connection becomes stable. Also, the durability of the mold itself is increased.

The mold 10 according to the embodiment has been described above.
The present invention is an improvement of the working portion of the barrel caulking, and it is needless to say that the present invention is not limited to the one having the press contact blades 7 as in this embodiment, but can be applied to a mold having only the crimping action.

[0024]

As described above, the press-contacting die according to the present invention has a notch at the pressing end of the barrel caulking portion, so that when the electric wire is crimped by the barrel caulking,
The barrel bends and presses against the side wall of the next cavity,
Even if the side wall is inclined, the notch does not cause the barrel caulked portion to descend to the inclined side wall portion, so that there is no possibility of breakage.

[0025] This means that in the connector which is required to be further miniaturized and the density of the arranged wires to be further increased in the future, the arrangement pitch of the terminals becomes narrow, and the space in the width direction of the cavity becomes insufficient. Therefore, it is particularly effective in a connector in which the thickness of the side wall of the cavity is reduced. If the wall thickness is thin, it is easy to tilt by pressing the barrel,
This is because if the mold without the notch descends, it may be easily damaged.

In the above configuration of the present invention, if the surface of the mold facing the electric wire is curved along the peripheral surface of the electric wire, each of the barrels on both sides of the electric wire is effectively applied to the outer surface of the electric wire along the curved surface. The connection strength of the electric wire with respect to the connector is increased.

Further, if a surface hardening treatment is applied to a contact portion of the mold with the barrel tip surface to harden the surface, the durability of the mold is increased, and the barrel can be strongly and smoothly bent.
The bending condition is stabilized.

Further, if the mold according to the present invention is used, even when the press-contact and the pressure-bonding are simultaneously performed by providing the press-contact blade in the mold,
As described above, the crimping operation is performed without interference with the side wall of the adjacent cavity, and the press-contact blade is smoothly lowered without receiving resistance from the mold, so that the pressing force of the press-contact blade is directly transmitted to the electric wire. Thus, effective and good pressure welding can be performed.

[Brief description of the drawings]

FIG. 1A is a side view including a partial cross section, and FIG.
Figure of embodiment showing front view

2A is a side view, FIG. 2B is a bottom view, FIG. 2C is a front view, and FIG. 2D is a partially enlarged view of the embodiment shown in a rear view.

FIG. 3 is a perspective view showing a use state of the embodiment.

FIG. 4 (a) shows a positional relationship between a terminal, a cavity side wall, a mold barrel caulking portion, and an electric wire immediately before crimping, and FIG. 4 (b) shows a state in the middle of crimping to explain advantages of the embodiment. Schematic diagram

FIG. 5 is a perspective view showing a wire harness.

FIG. 6 is a perspective view showing pressure welding.

FIG. 7 is a front view showing a pressure welding;

FIG. 8 is a perspective view showing a terminal with a barrel.

FIG. 9 is a perspective view showing a use state of a conventional mold.

FIG. 10 is a diagram showing a defect in the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting part 2 Mounting hole 3 Pressure contact part 4 Barrel caulking part 5 Curved surface (pressing surface) 6 Notch 7 Pressure contact blade 10 Mold 30 Connector 32 Cavity 33 Cavity 33 Side wall of cavity 40 Terminal 41 Slot 42 Side wall of slot 43 Barrel 50 Electric wire 51 Conductive Body 52 covering

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Ryosuke Shioda 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi Harness Research Institute F-term (reference) 5E012 AA02 AA39 AA43 5E063 CB01 CC04 CD01

Claims (4)

[Claims] 1. A crimping die which inserts a crimping terminal having a pair of barrels on both front and rear sides into a cavity of a connector and presses an electric wire to the crimping terminal to crimp the barrel into the cavity. A press-molding die having a notch having a shape such that a barrel caulked by crimping of an electric wire in an adjacent cavity does not interfere with a side wall of the adjacent cavity which presses and inclines. . 2. The press-welding mold according to claim 1, wherein a surface facing the electric wire is a curved surface along a peripheral surface of the electric wire. 3. The pressure welding die according to claim 1, wherein a surface hardening treatment is applied to a contact portion with the barrel tip surface. 4. The press-contact mold according to claim 1, further comprising a press-contact blade for performing the press-contact.