JP2558357Y2 - Crimping mold for crimp terminal - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crimping die used for crimping a terminal to an electric wire, and more particularly to a terminal for preventing the terminal from biting into a crimper for an upper die when the mold is released.

[0002]

2. Description of the Related Art Conventionally, a crimp terminal 1 having a shape shown in FIG. 5 is usually used as a connector terminal used for connecting electric wires used in automobiles and OA equipment. The terminal 1 has an electric contact portion 3 at a front portion of a substrate portion 2 and an electric wire connection portion 4 at a rear portion. The electric wire connection portion 4 is provided with a wire barrel 5 and an insulation barrel 6. Crimp terminal 1
When the wire is crimped to the wire, the wire 9 having the conductor 8 exposed from the tip of the insulating coating 7 is inserted into the wire connecting portion 4, and the wire barrel 5 is crimped on the conductor 8, and the insulation 6 is crimped on the insulating coating 7 to be crimped. Have been.

[0003] The crimping is performed using a crimping die shown in FIG. The crimping die has a convex surface 11 for a fixed lower die.
Crimpers 12A, 12B having concave upper surfaces 13 for upper dies that move up and down above anvils 10A, 10B having
The crimper 12A, as shown in FIG.
The wire barrel 5 and the insulation barrel 6 are deformed into the conductor 8 and the insulating coating 7 by crimping and crimping by fitting the anvils 10A and 10B by descending the 12B.

At the time of the above-described crimping, the wire barrel 5 and the insulation barrel 6 are compressed together with the conductor 8 and the insulating coating 7, so that springback occurs, and the wire barrel 5 and the insulation barrel 6 dig into the crimpers 12A and 12B, and are crimped. When the crimper is lifted and released from the mold without releasing the terminal from the crimper, a failure phenomenon that the terminal is not lifted and detached occurs.

Therefore, the crimpers 12A, 12C
Various means for removing the terminal from B are conventionally provided to prevent the occurrence of a defective phenomenon. For example, as shown in FIG. 8, a stripper (release member) 15 is arranged on the side of the crimpers 12A and 12B, and the terminal 1 is moved up by the stripper 15 in conjunction with the crimper.
Is forcibly removed.

[0006]

By installing the above-mentioned stripper, it is possible to release the terminal from the crimper of the terminal. However, the terminal is often deformed at the time of release from the terminal due to biting by springback.

In addition, when the stripper is fixedly installed, the terminal has a disadvantage in that, when the mold is released, the terminal is inclined due to the resistance to removal from the crimper and the contact with the stripper, and the electric wire near the terminal is bent. On the other hand, in order to eliminate the above-mentioned drawbacks, when the stripper is operated up and down to lift the terminal later than the crimper and the terminals are wiped off, a complicated mechanism is required to operate the stripper up and down. However, there is a disadvantage that the structure of the crimping die becomes complicated.
In addition, even in this case, it is possible to prevent the bending of the electric wire, but since the terminal caught by the crimper is forcibly removed by springback, the effect of preventing the terminal from being deformed is small.

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problem, and a method of forcibly removing a terminal caught by a crimper by a springback at the time of terminal crimping by a stripper causes deformation of the terminal. In view of the above, it is possible to prevent the terminal from rising together with the crimper without causing the crimper to bite itself, thereby preventing the terminal from being deformed and eliminating the need for installing a stripper.

[0009]

That is, the present invention comprises a fixed lower die anvil and an upper die crimper which operates up and down, and a terminal for crimping the terminal on the anvil to an electric wire by lowering the crimper. In the crimping die, the first crimper and the second
On the inner surface opposite to the crimper, a gap communicating with the concave mold surface is provided, and on the anvil, outer surface guide portions of the first crimper and the second crimper are provided. The inner surface of the crimper and the second crimper are in contact with each other, the mold surface is continuous, and after the crimping by fitting, the crimper is raised and released from the outer surface guide portion to return to the original shape in which the clearance is generated. A crimping die for a terminal is provided.

[0010]

The crimper is divided as described above, and the crimper divided by the guide portion provided on the anvil is continuously connected integrally with the anvil at the time of fitting with the anvil, so that the crimper has a required shape along the continuous concave mold surface. When the terminal, the conductor, and the insulation coating are compressed and caulked and fixed, and the crimper is raised after the completion of the crimping, the regulation by the guide portion of the anvil is released, and the crimper returns to the original state where a gap is generated. Therefore,
Even if springback occurs in the terminal due to compression, the crimper generates a gap and splits, so that the terminal does not cling to the crimper.

As described above, it is possible to prevent the terminal crimped with the electric wire from rising in conjunction with the crimper. Therefore, the stripper conventionally required can be dispensed with, and the deformation of the terminal, which is likely to occur when the stripper is forcibly removed, can be prevented.

Further, since the crimper is divided, the stress due to the occurrence of springback is eliminated, the metal fatigue on the mold surface is reduced, and the mold life can be improved.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. In the embodiment shown in FIGS.
Is a crimper that constitutes an upper die of a terminal crimping die, and 21 is an anvil that constitutes a lower die. The crimper 20 and the anvil 21 are the same as the above-described conventional example,
Is fixed, and the wire 9 is inserted into the terminal 1 on the mold surface 22 (specifically, the conductor 8 is inserted on the wire barrel 5 side, and the conductor 8 and the insulating coating 7 are inserted on the insulation barrel 6 side). ).
The upper crimper 20 is disposed above the anvil 21 so as to be opposed thereto, and is held by a slide 23 to be moved up and down. When descending, the concave mold surface 24 and the mold surface 2 of the anvil 21 are moved.
2, the terminal 1 and the conductor 8 or the terminal 1 and the conductor 8 and the insulating coating 7 are compressed and fixed by caulking.

As shown in the figure, the crimper 20 cuts the center of the lower end surface of the flat plate shape to form the curved mold surface 24, and the deepest point P of the mold surface 24 is formed.
1 to the upper end of the crimper 20, cut the crimper 20 in the vertical direction,
5 and a second crimper 26.

The first crimper 25 and the second crimper 26 are divided into portions 25b, 2 of the mold surface 24 which are concavely formed in an arc shape at lower ends of opposed inner surfaces 25a, 26a on the cutting side.
6b, and protruding portions 25c, 26c extending further below the mold surfaces 25b, 26b.

Further, semicircular bolt holes 25c and 56c which are circular bolt holes are formed in the inner surfaces 25a and 26a of the first crimper 25 and the second crimper 26 so as to communicate with each other. The bolt holes 25c and 26c are set to have a size that allows the bolt holes 25c and 26c to be loosely fitted to the support bolt 27 as shown in FIG. By attaching the first crimper 25 and the second crimper 26 thus divided, the first crimper 25 and the second crimper 26 can be moved by a distance corresponding to the clearance.

That is, in the original position shown in FIG. 1, the inner surfaces 25a and 26a of the first crimper 25 and the second crimper 26 are formed.
A gap C is generated between the mold surface 24 and the gap C, which communicates with the deepest point P1 of the mold surface 24, so that the gap C is formed at the center of the mold surface 24. The size of the gap C is approximately 0.1 mm or more.
A range of 0.3 mm is preferred.

Therefore, when the first crimper 25 and the second crimper 26 are pressed in a direction in which they contact each other, the gap C is eliminated and the mold surface 24 is continuously formed.

In the anvil 21 for the lower die, the outer guides 28 and 29 into which the lower protruding portions 25c and 26c of the first crimper 25 and the second crimper 26 are inserted are formed on the upper end surface of the die surface 22. It is recessed on both sides of the central projection 30. When the first crimper 25 and the second crimper 26 are lowered and the protruding portions 25c, 26c are inserted, the outer surface guide portions 28, 29 press the outer surfaces 25e, 26e of the crimper when the protrusions 25c, 26c are inserted. Then, the inner surfaces 25a, 26a of the opposing surfaces are set in contact with each other to eliminate the gap C.

As shown in FIG. 2, the crimper 20 and the anvil 21 are both a crimper 20-I for a wire barrel, a crimper 20-II for an insulation barrel, an anvil 21-I for a wire barrel, and an anvil 21-II for an insulation. The shape is as described above.

The crimpers 20-I and 20-II for the wire barrel and the insulation are attached by fixing the one-side holding plate 40 to the rear end surface of the slide 23 with the bolt 31 and then placing the plate in the recess 23a of the slide 23. 3
2. Insert the insulation crimper 20-II, the wire barrel crimper 20-I and the other side holding plate 33, and bolt holes 33a, 25 formed in these plates.
c and 26c, 32a, 40a are connected through bolts 27. At this time, as described above, the wire barrel crimper 20-I and the insulation crimper 20-II are loosely fitted to the bolt 27.

At the upper end of the slide 23, a lifting ram 3 is provided.
4 is locked in the locking groove 23b so that the crimper and the like move up and down integrally with the slide 23.

Next, the crimping operation of the terminal by the crimping die will be described. As shown in FIG.
Is lowered via the slide 23, first, the first crimper 25 and the second crimper 26
Are inserted into the outer surface guides 28 and 29 of the anvil 21,
The outer guide portions 28 and 29 are forcibly closed so as to eliminate the gap C on the opposed inner surfaces.

Therefore, the first and second crimpers 25, 26
Are continuous, and the continuous mold surface 24 and the anvil 2
The terminal 1 and the conductor 8 or the terminal 1 and the conductor 8 and the insulating coating 7 are compressed by the mold surface 22 and the mold surface 24 and the mold surface 2.
2. The wire barrel 5 and the insulation barrel 6 of the terminal 1 are plastically deformed to the shape designated by 2.

After the completion of the crimping, the crimper 20 is raised, and the protrusions 25 of the first and second crimpers 25 and 26 are raised.
When c and 26c are disengaged from the outer guides 28 and 29, the terminals 1 are pressed in the directions away from each other by the springback of the terminal 1, and a gap C is generated between the inner surfaces 25a and 26a of the first and second crimpers. As shown in FIG. 4, due to the generation of the gap C, the terminal does not bite into the crimper, and the terminal connected to the electric wire can be smoothly released from the mold.

[0026]

As is clear from the above description, according to the terminal crimping die according to the present invention, since the crimper is a split type, a gap is generated when the crimper is raised after crimping, and this gap is generated. Thereby, even if spring back occurs in the terminal, it is possible to prevent the crimper from being caught.

Accordingly, it is possible to prevent deformation that occurs when the terminal is forcibly removed. Further, there is an advantage that a mold releasing member is not required, and the configuration of the mold can be simplified.

Further, since the crimper is divided, even if springback occurs in the terminal, the stress does not act on the crimper, so that the life of the crimper can be improved.

[Brief description of the drawings]

FIG. 1 is a front view of a crimping die according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the entire crimping die according to the embodiment.

FIG. 3 is a front view showing a crimping step using a mold in the embodiment.

FIG. 4 is a front view showing a mold releasing step using a mold in the embodiment.

FIG. 5 is a perspective view of an electric wire and a crimp terminal.

FIG. 6 is a schematic view showing a conventional crimping mold and a crimping action by the mold.

FIG. 7 is a schematic view showing a conventional crimping mold and a crimping action by the mold.

FIG. 8 is a schematic view showing a mold provided with a conventional stripper and a crimping action thereof.

[Description of Signs] 1 Terminal 5 Wire Barrel 6 Insulation Barrel 7 Insulating Coating 8 Conductor 9 Electric Wire 20 Crimper 21 Anvil 22, 24 Mold Surface 25 First Crimper 26 Second Crimper C Skimmer

Claims (1)

(57) [Scope of request for utility model registration] 1. A terminal crimping die, comprising: a fixed lower die anvil; and an upper die crimper that moves up and down, and crimps a terminal on the anvil to an electric wire by lowering the crimper. A gap between the first crimper and the second crimper is provided on the inner surface facing the divided crimper, and an outer surface guide portion of the first crimper and the second crimper is provided on the anvil. At the time of fitting, the inner surface of the first crimper and the inner surface of the second crimper are brought into contact by the outer surface guide portion, and the mold surfaces are continuous. When the crimper rises and is released from the outer surface guide portion after crimping by fitting, A crimping die for crimping terminals with a gap.