JP2604317B2 - Crimp terminal manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal crimp terminal having a tubular portion for connecting an end of an electric wire, a fork-shaped, ring-shaped or plate-shaped connecting tongue for connecting to a desired device, and The present invention relates to the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, this type of metal crimp terminal, that is, FIG.
A tubular part (10a) for connecting the ends of the electric wires as shown in FIG.
The metal crimp terminal (10) provided with the connecting tongue piece (10b) for connecting to a desired device is manufactured by pressing a metal plate material. In this case, since the tubular portion (10a) is formed by bending the plate material upward and round, a groove (10c) having a V-shaped cross section is necessarily formed along the axial direction at the joint at the upper end thereof. Is done. Such a V-shaped groove (10c)
In the cross-sectional shape of the cylindrical part (10a), a scar is formed in a complete ring shape, and when the end of the electric wire is inserted into the cylindrical part (10a) and crimped from the outer periphery, the groove (10c) part separates right and left. Therefore, there has been a drawback that complete electrical and mechanical connection may not be achieved, so that silver wax (10d) has been poured into the groove (10c) in the past.

[0003]

However, in order to use an automatic machine to fill the grooves of each crimp terminal with silver wax, it is necessary to arrange a large number of crimp terminals in a state in which the grooves are facing upward and to transfer the crimp terminals. The equipment and the robot mechanism for melting and pouring silver wax into the groove required a very expensive equipment. In addition, since the crimp terminal once manufactured by press working is poured with silver wax by secondary processing, workability is deteriorated and production cost is increased.

In addition, in the above conventional means, silver wax is
There is a problem that the material of the terminal is annealed and the hardness is deteriorated because the entire terminal is heated when the terminal is poured into the groove (10c). In particular, when the tongue piece (10b) is formed in a forked fork shape as shown in the figure, the left and right claws may be displaced up and down with horizontal accuracy during plating, packing, and transportation after brazing due to this hardness deterioration. Or, when the screws are tightened to the device, the distance between the right and left claws widens or deforms, so that not only the mechanical connection, but also the electric contact reduces the contact area and the current density. However, there has been a defect that a good connection state cannot be obtained.

Accordingly, a first object of the present invention is to provide a series of press working flow operations by incorporating means for pouring silver wax into grooves in a press working step of forming a crimp terminal from a metal plate material. Provided is a manufacturing method capable of mass-producing inexpensively a large number of crimping terminals having a wire connection tube portion in which a letter-shaped groove is filled with a melt-hardened silver wax and a tongue piece for connecting to a desired device by a series of processes. Is to do.

Further, a second object of the present invention is to form a wire connecting cylinder having a groove having a V-shaped cross section on a strip-shaped metal plate material in a chain shape, and cut into a predetermined dimension in the V-shaped groove. Insert the silver wax and melt the silver wax with a brazing device at a predetermined temperature,
Finally, the outer periphery of the tongue portion connected to the cylindrical portion is punched, so that the peripheral portion of the tongue of the crimp terminal material annealed for heating by the brazing device has a compressive and tensile action during the outer punching process. Accordingly, it is an object of the present invention to provide a method of manufacturing a crimp terminal formed with higher hardness than other parts.

[0007]

In order to achieve this object, the present invention employs the following technical means. That is, according to the present invention, the belt-shaped metal sheet material (A) is fed into the first composite press device (B), and is sequentially subjected to a die-cutting and pressing / bending process, so that the section V
The V-shaped groove (1c) is formed by chain-forming an electric wire connection tube part (1a) in which a U-shaped groove (1c) is formed at the upper end joint along the axial direction.
c) Insert a bar-shaped silver wax (2) cut into a predetermined length into
Next, a metal plate material (A) in which silver wax (2) is placed on this cylindrical portion (1a) ...
Into the brazing device (C), heat-melt the silver wax (2) to fill the V-shaped groove (1c), and then feed the metal plate material (A) into the second pressing device (D) to form the outer shape. Go ahead and
V-shaped groove (1c) filled with melt-hardened silver wax (2), electric wire connection cylinder (1a) and tongue (1b) for connection to desired equipment
And manufacturing a crimp terminal (1) having the following.

[0008]

According to the present invention, in a series of press working steps of a metal plate material, silver wax is heated and melted to fill a V-shaped groove (1c),
Finally, since the outer shape is removed to complete the product, the melting process of the silver wax can be automatically performed along the flow of the press working of the metal plate material, thereby forming a V-shaped groove.
It is possible to continuously mass-produce an excellent crimp terminal having an electric wire connection tube portion (1a) filled with a melt-hardened silver wax (1c) and a tongue piece (1b) for connection to a desired device. . In addition, the crimp terminal obtained in this manner has a peripheral part of the tongue piece punched out in the last step, although the hardness of the material has been deteriorated due to the entire material being annealed by heating in the brazing device. Since the hardness is higher than the other parts due to the compression and tensile action at the time of processing, the tongue piece is particularly formed in a forked fork shape, and the hardness of the peripheral part is increased. The left and right nail parts do not move up and down with horizontal accuracy during plating, packing and transportation after brazing, or the gap between the left and right nails does not expand or deform outward when tightening screws to equipment Thus, reliable electrical and mechanical bonding can be obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on embodiments shown in the drawings. 1 to 5 show a schematic manufacturing process of a crimp terminal according to the present invention. In FIG. 1, the arrangement of the devices used in the method of the present invention is shown in the lower part, and the production order of the metal sheet material (A) to be sequentially fed and processed into these apparatuses is shown in the upper part, and the metal sheet material (A) is shown. A)
The portions surrounded by dashed lines indicate the work areas of the lower device connected by arrows, respectively. Thus, in the present invention,
A strip-shaped copper plate metal sheet material (A) having an appropriate thickness and width is fed into a first composite press (B), and is subjected to successive die-cutting and pressing-bending steps as shown in FIG. As shown in the figure, the groove (1
The wire connection tube (1a) formed at the upper joint at (c) is formed into a chain. In the embodiment, the wire connecting cylinders (1a)... Are alternately formed on the left and right sides of the metal material (A) to reduce production efficiency and waste of material, but they may be formed on any one side. Good.

In the step of forming the cylindrical portion, the V-shaped groove (1
Insert a bar-shaped silver wax (2) cut into an appropriate length into c).
As shown in FIGS. 2 to 4, this silver wax (2) is supplied after being cut into appropriate dimensions by a silver wax supply device (E) in which a linear material is incorporated in a first composite press device (B). You. In this embodiment, the silver wax supply device (E) is formed as shown in FIGS. In the figure, the right side figure shows the central vertical sectional view in the left side figure a, and the V-shaped groove (1c) of the cylindrical part (1a) which is formed sequentially by the first composite press (B). The linear silver wax (2) is sent out to the upper part of the) at the specified size, and the upper die combined cutter (3) set in the composite press machine
At the same time as shown in FIG.
It is formed to fit into c). However, in the present invention, as the means for supplying the silver wax, any means having a mechanism capable of sequentially supplying the silver wax cut into a predetermined size to the V-shaped groove may be used. The cross-sectional shape of the rod-shaped silver wax (2) is not limited to a triangular shape as shown in the figure, but may be a circular or square shape.

Next, the grooves (1c) of the electric wire connection cylinders (1a)...
The metal plate material (A) on which the silver wax (2) is placed is sent to a brazing device (C) at a predetermined temperature, and the silver wax (2) is heated and melted to completely fill the V-shaped groove (1c). And finally, the metal plate material
(A) was fed into the second pressing device (D) to remove the outer shape of the forked tongue piece (1b), and the V-shaped groove (1c) as shown in FIG. 6 was melt-hardened. Electric wire connection tube part (1a) filled with silver wax (2) and tongue piece (1b) for connection to desired equipment
Are sequentially manufactured.

The crimp terminal (1) thus obtained is
As shown in FIG. 7, the core wire tip (k) from which the coating of the wire (K) has been removed is inserted into the wire connection tube (1a), and the tube (1a) is crimped from the outer periphery to form the wire (K). The crimp terminal (1) is connected and used. At this time, since the V-shaped groove (1c) of the cylindrical portion (1a) is filled with the melt-hardened silver wax (2), the cylindrical portion (1a)
Is formed as a complete ring body with no notch in its cross-sectional shape, which ensures that the wire is securely connected without the groove being separated when the wire end is inserted into this cylinder and crimped from the outer periphery. You can do it. Particularly in the crimp terminal (1) of the present invention, the tongue piece (1b) whose outer shape was removed in the last step despite the fact that the entire material was annealed by heating in the brazing device and the hardness was deteriorated. Is formed such that the hardness of the peripheral portion is higher than that of the other portions by the compression and tensile action during punching.

In the above embodiment, the silver wax supply device (E) for supplying the silver wax (2) to the V-shaped groove (1c) of the cylindrical portion is incorporated in the first composite press device (B). The wax supply device (E) may be provided between the first press device (B) and the brazing device (C).

Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only the structures of these embodiments. For example, the shape of the connecting tongue piece (1b) for the crimp terminal is described. Can be changed to a ring shape as shown in FIG. 8, a plate shape as shown in FIG. 9, or another arbitrary shape. In addition, the present invention can be appropriately modified and implemented within a range having the constituent elements and having the following effects.

[0015]

As is apparent from the above description, the present invention heats and melts silver wax in a series of press working steps of a metal plate material to form a V-shaped groove in a cylindrical portion. Since the product is completed by embedding and then removing the outer shape, the melting process of silver wax can be automatically performed according to the flow of press working of the metal plate material, thereby forming a V-shaped groove. A crimp terminal having an electric wire connection tube filled with a melt-hardened silver wax and a connecting tip to a desired device can be continuously mass-produced by a simple device. In addition, in the crimp terminal obtained by the method of the present invention, despite the fact that the entire material is annealed due to the heating by the brazing device and the hardness is deteriorated, the peripheral portion of the tongue piece that has been cut out in the last step has It is formed with hardness higher than other parts due to compression and tensile action at the time of punching, so that the tongue piece part may be deformed during plating, packing, transportation, etc. after brazing or screwing to equipment Distortion is prevented, and there is an effect that an electrically and mechanically reliable bonding state can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a method for manufacturing a crimp terminal according to the present invention.

FIG. 2 is a cross-sectional view of a metal plate material in a first composite press device part of the above method.

FIG. 3 is a sectional view of a silver wax supply unit.

FIG. 4 is a sectional view showing an operation of the silver wax supply device shown in FIG. 3;

FIG. 5 is a perspective view showing one process of an electric wire connection tube manufactured by the above method.

FIG. 6 is a perspective view showing one embodiment of a crimp terminal according to the present invention.

FIG. 7 is a sectional view showing a usage example of the crimp terminal.

FIG. 8 is a perspective view showing another embodiment of the crimp terminal according to the present invention.

FIG. 9 is a perspective view showing still another embodiment of the crimp terminal according to the present invention.

FIG. 10 is a perspective view showing a conventional crimp terminal.

[Explanation of symbols]

 (1) Crimp terminal (1a) Wire connection tube (1b) Connecting tongue (1c) Groove (2) Silver wax (A) Metal plate material (B) First composite pressing device (C) Brazing device ( D) Second press device

Claims (1)

(57) [Claims] 1. A strip-shaped metal plate material (A) is fed into a first composite press device (B), and is sequentially subjected to a die-cutting and press-bending process, whereby a V-shaped groove (1c) is formed along the axial direction. The wire connecting cylinder (1a) formed at the upper end joint is formed in a chain shape, and the V-shaped groove (1c) is cut into a rod-shaped silver wax cut to a predetermined length.
(2) is inserted, and then the metal plate material (A) having silver wax (2) placed on the cylindrical portion (1a) is fed into a brazing device (C), and
(2) is heated and melted to fill the V-shaped groove (1c), and then the metal sheet material (A) is fed into the second pressing device (D) to remove the outer shape, and the V-shaped groove (1c) is formed. Melt-hardened silver wax
A method for producing a crimp terminal, comprising: producing a crimp terminal (1) including a wire connection tube portion (1a) filled in by (2) and a tongue piece (1b) for connection to a desired device.