JPS63254689A - Wire terminal and manufacture of the same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an electric M terminal connected to the end of an electric wire and used for electrical connection to a device, and a method for manufacturing the same.

<Prior art> Conventionally, this type of electric wire terminal is made by forming a tip connection 1 (la) of a predetermined shape and a portion for forming a cylindrical portion (11) into a flat plate using a copper strip material, for example, as shown in Figure 37 of the attached sheet. This tube 71 (11) forming flat plate part is formed into a cylindrical shape, and the abutting parts (12) at both ends are heated at 700°C (silver brazing, α).
It was heated to the above temperature, sprinkled with 7lux to remove oxides on the surface, and soldered with silver solder (Ag-Cu alloy).

<Problems to be Solved by the Invention> Therefore, in manufacturing this type of electric wire terminal, brazing not only required high temperature processing for welding, which was accompanied by danger. If this brazing is not carried out with the part (13) in a flat state, for example if there is a raised part on the outer surface of the cylinder part (11), the covering cylinder (10) shown in FIGS. This makes it difficult to insert the cylindrical part (11) of the wire, and when crimping the wire, only the raised part is locally strongly pressed, making it difficult to crimp evenly. 11) This causes problems when the wire is inserted into the wire, and similarly to the above problem, it is difficult to crimp the wire evenly.
Butt part (12) of cylindrical part (11) when crimping to electric wire
will separate, resulting in a defective product that cannot be crimped. Additionally, there is a problem in that a considerable number of personnel are required to inspect defective products after manufacture. However, in addition to these drawbacks, the biggest problem is that the brazing process itself, which requires high heat, occupies a large proportion of the manufacturing process.

Therefore, in order to solve these conventional problems, the present inventors did not aim to improve the processing method for brazing, which is a problem in the prior art, but by taking a completely different approach to this essential process. With brazing, the processing itself is completely eliminated from the process, and at least wire terminals can be manufactured extremely efficiently using only cold processing (although it is possible to additionally heat the material in step 1). The object of the present invention is to obtain a manufacturing method that allows the wire terminal to be attached to an electric wire by crimping, and to obtain an electric wire terminal that has no risk of leaving a cylindrical portion separated when being crimped and attached to an electric wire.

Means for Solving the Problems> The structure of the present invention for achieving the object will be explained using FIGS. 1 to 29 corresponding to the embodiments. An invention relating to a terminal, the seventeenth invention
As shown in the figure, there is an electrical connection to the device (1
a) and has a cylindrical part (1b) for wire connection on the other end side, the entire terminal is formed of a series of metal plates, and the cylinder gts (11+) is formed of a series of metal plates. It is configured to be formed into a seamless cylindrical shape by drawing.

Further, the second invention is an invention relating to a method for manufacturing the electric wire terminal referred to in the ip1 invention, and as shown in FIGS. (3) and a disc part (4), a drawing process of transforming the disc part (4) into a bottomed cylindrical part (5), and a drawing process of transforming the disc part (4) into a bottomed cylindrical part (5). Hole (51) in the bottom (5a)
) is the process, and the hole is the machined circle ff.
An end face shaping process in which the outer end face of the J part (] I) ) is shaped, and a die cutting process in which the terminal end side connected to the cylindrical part (1b) is formed by die cutting from the strip material (2) are sequentially repeated. There is a method of manufacturing it.

Furthermore, the third invention relates to another manufacturing method for twisting the electric wire terminal referred to in the first invention, and is shown in FIGS.
As shown in the figure, a metal strip material (2) with high conductivity and ductility has a sprocket hole (3), a disc part (4), and a disc part (4).
forming a hole <51)) in the center of the disc 8';
A drawing process of transforming l5 (4) into a cylindrical part (5), an end face shaping process of shaping the outer end face of the cylinder 81S (To) processed into a cylindrical shape, and the cylindrical part (1b) The manufacturing method involves sequentially repeating the die-cutting step of forming the terminal end side connected to the band-shaped material (2) by die-cutting.

Since the present invention has such a manufacturing method and structure, there is no need to use high-temperature heat throughout the manufacturing process, and it is possible to produce electric and tQ'4J elements only by cold working. Moreover, it is suitable for extremely efficient mass production, and the finished wire terminal has a homogeneous surface, and the cylindrical portion remains intact even when crimped and deformed when connecting to the wire. This makes it possible to obtain terminals that are free from the risk of separation or local crimping.

<Example> Embodiments of the present invention will be described below based on the drawings.

(First Example) First, for convenience of explanation, the manufacturing method of the second invention will be described.

This embodiment is an example of a method for manufacturing a round (ring-shaped) terminal in which the connection part to the device is round, and is shown in FIGS. 1 to 17.
The figure shows an embodiment of the second invention, Figure 11 is a T-side view showing the entire production process, and Figures 2 to 17 are partial perspective views showing each process in order. FIG. 3 is a vertical cross-sectional view of the respective arrow-view portions or central portions.

First, a strip material (2) made of steel plate is placed during each processing process.
i, a feed hole (3) for sequential transfer is formed at a position offset to one side from the center line (Fig. 2), and then a circle g1 part (4) is formed for forming the cylindrical part (1b). The gap portion (4a) is punched out to form the disc portion (4a) (Fig. 3), and then the disk portion (4) is formed by fjS1 (Fig. 4-5) and the second
Next (Figures 6 and 7), Third (Figures 8 and 9), Fourth (1
1 (Figs. 1 and 11) and while shifting the center of the hole toward the strip material (2) (Fig. 1), the embossment process is repeated from shallow drawing to deep drawing in order to form a shallow cylindrical shape with a bottom. A bottomed cylindrical portion (54) is formed in order from the portion (51). Next, the bottomed cylindrical part (
The bottom part (5a) of 54) is punched out, and a hole (5a) is made in the bottom part.
11) to form a bottomless cylindrical part (55) (Fig. 12), and a hole (51) from which the bottom ff1s (51) has been removed.
) with a conical jig (56) to press the end of the cylindrical portion (55
) and at the same time chamfer its inner surface.
) The processed cylindrical part (5) is formed (Fig. 13), and the forming process of the cylindrical part (1b) is completed.

Next, Figure 14, j! l's15 figure arrow (61),
As shown in (62), the direction of the hole in the cylindrical part (1b) is corrected to be in the same plane as the surface of the strip material (2), and then the feed hole (3) formed in the strip material (2) is As the center hole, insert the tip connection part (1a) of the round terminal (1) around it.
) to form a connecting hole (1d) by punching out it.
(Fig. 6), the base (1e) on the side of the strip material (2) connected to the cylindrical portion (1b) is pressurized to give it strength, and finally the shape is adjusted to match the tip shape (1r) of the terminal (1). Then, the band-shaped material (2) is punched out and the tip of the terminal is formed by die-cutting (FIG. 17).

In this way, the round terminal (1) shown in the lower part of Fig.
form.

The round end T(1) formed by the above manufacturing method is
The tip side has a connection part (In) to various devices, the entire terminal is made of a series of copper plates, and the cylindrical part (1b) for connecting electric wires has a cylindrical part (1b) for inserting the electric wires on the inner surface of the outer end side. A chamfer (lc) is applied to make it easier, and the cylindrical part (1
b) It is a groove channel formed in a completely seamless cylindrical shape with no seams all around the circumference.

(Second Embodiment) Next, a third embodiment of the invention relating to another manufacturing method will be described based on FIGS. 18 to 29.

For convenience of explanation, this embodiment is also an embodiment relating to a round terminal in which the connecting portion to the device is round, similar to the ML embodiment.

FIG. 18 is a plan view showing the overall manufacturing process similar to FIG. R51, and FIG.

A feed hole (3) of the copper strip material (2) placed during each processing step and a cylindrical portion (111) are formed at a position biased to the negative side and a position biased to the other side of the copper strip material (2) placed during each processing step. A small hole (
(hereinafter referred to as the center hole) (5b) (Fig. 19)), and then form a circular disk portion (4) with a hole for forming a cylindrical portion (11)) centered on this medium hole (51+). A gap portion (4a) is punched out to form the second
(Fig. 0), then the holed disk part (4) is subjected to the first, second, third, and fourth drawing processes (Figs. 21 to 24), sequentially from hollow drawing to deep drawing. is processed into a cylindrical shape to form sequentially deep cylindrical portions (51 to 54), and the central hole (5b) is also sequentially enlarged to form the holed disc portion (4).
) into a cylindrical shape (Fig. 24), the outer end surface of the thus-processed cylindrical portion (5) is pressed and shaped with a conical jig (56), and at the same time the inner surface is chamfered (1c). Pressure is applied (FIG. 25) to complete the formation of the cylindrical portion (1b).゛The following steps are similar to the processing steps shown in FIGS. 14 to 17 in the case of the first embodiment.
After machining to correct the hole direction (Fig. 26.27) in b), forming the hole (1d) for direct connection of the terminal (Fig. 28), and pressurizing the base (1e), the terminal tip shape (1f) was formed. After punching and forming (FIG. 29), the round terminal (1) shown in the lower view of FIG. 29 is obtained.

The terminal (1) obtained by this method is similar to the round terminal (1) shown in the lower view of FIG. ), and the cylindrical part (1b) is of a vI construction in which the cylindrical part (1b) is formed in a seamless cylindrical shape over the entire circumference.

(Modifications) Next, various modifications shown in FIGS. 30 to 536 and other modifications will be described.

Round terminals obtained by the above first and second embodiments (
In step 1), a bare electric wire portion from which the end coating of the electric wire has been peeled off is inserted into the cylindrical portion (1b), and the cylindrical portion (1b) is deformed and crimped with a pressure tool to hold the electric wire. In this case, the cylindrical part (1b) is the sight all around the circumference, so even if the crimping is deformed from any angle in the circumferential direction, the joint part will not be destroyed and separated as in the conventional case, so the crimping position can be adjusted. There is no need to pay close attention to ensure that the wire is always on the joint, and the crimp connection to the wire can be made extremely reliably from any angle in the circumferential direction.

What is shown in FIGS. 30 and 31 is a large diameter portion (lob).
) and a small diameter part (10a), which are made of synthetic resin and have a two-step diameter, and are connected by fitting a cylindrical part (1b) into the small diameter part (10a). It is often used in this way.

This covering! When inserting the terminal (10), since the cylindrical portion (11) of the terminal (1) according to the present invention is seamless and has not been welded with silver solder, etc. What? '&') Since there are no rising parts and the entire circumferential surface is a flat circumferential surface, the covering tube (10) can be inserted smoothly without being distorted. Also, the cylindrical portion (11) Since the inner surface of the wire is flat and there is no flow of silver solder or the like as in conventional products, there is no problem at all when inserting bare wires.

Figures 32 to 35 show the tip connection part (1a) of the terminal (1).
) are typical examples of different types.
The terminal (1) in Fig. 2 is a hook-shaped terminal in which the tip connection part (1a) has a notch (1d) in the direction of lateral force, and the terminal (1) in Fig.
) is a U-shaped (fork-shaped) terminal in which the tip connection portion (1a) has a notch (1d) in the tip direction, and the terminal (1) in Fig. 31
The terminal (1) in FIG. 35 has a terminal in which the tip connection portion (1a) is formed into a flat plate shape (tab shape), and the terminal (1) in FIG. These are examples of a terminal formed into a formation (plug shape) which is further curled into a rod shape. According to the present invention, such various types of terminals can be manufactured based on the above-described embodiments. However, it is not intended to be limited to only this type of device.

What is shown in FIG. 36 is the relationship between the bottomed cylindrical portion (54) and the strip material (2) in FIG. 11 in the first embodiment. If it is bent, there is a risk of brittle fracture occurring at this bent portion, so in order to prevent brittle fracture from occurring at this bent portion, during actual manufacturing, this portion should have a gently curved surface (21). It is an explanatory view showing that it is sufficient to carry out the process in a state where it is formed.

In the first embodiment, the disk portion (4) is formed after the feed hole (3) is formed, but even if the disk portion (4) is formed first, both may be formed. may be formed simultaneously. The processing including the center hole forming step in the second embodiment is also similar.

Further, the drawing process according to the present invention does not necessarily require four steps as in the embodiments, but may be three steps, five steps, eight steps or more if necessary, or even forming in one step. A good one, in short, the disk part (4)
Any method may be used as long as it takes the step of forming the cylindrical part (1b>) of the terminal (1).In addition, in the case of forming a round terminal, the connecting hole (ld) at the tip of the terminal (the above-mentioned Figure 32,
In the case of the hook-shaped terminal and the fork-shaped terminal shown in FIG. 33, a hole corresponding to the hole for forming the notch (1d) is first formed in the band-shaped material (2), and then this hole is formed in the band-shaped material (2). 2)
When used in place of the feed hole (3), the step of forming the hole (1d) shown in FIGS. 16 and 28 can be omitted.

In addition, most wire terminals (1) have a shape in which the tip connection part (1a) and the cylindrical part (1b) are located in the same plane direction, as shown in Figs. 17 and 29. Yes, but
There are also terminals in which these two parts (Ia) and (lb) are formed in a bent shape, that is, in a perpendicular state, as shown in FIGS. 13 and 25, so when manufacturing such a bent terminal, If you immediately move from the state shown in FIGS. 13 and 25 to the connecting hole (1d) forming process and tip die cutting process as shown in FIGS. 16, 17, 28, and 29. Good things are easy to understand.

In addition, in the above embodiment, the cylindrical part is processed in a single line on the negative side of the strip material (2), but the width of the strip material (2) is approximately twice the width, and the yield material (2) is It is also easy to understand that the process may be carried out as a two-row process in which the cylindrical part is processed on both sides of the process.

The material for forming the terminal according to the present invention may be any material that is rich in conductivity and ductility and suitable for drawing, such as silver, copper-based copper alloy, or aluminum.

Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited to the structures of these embodiments. It can be implemented with appropriate modification within the scope of achieving the following effects.

<Effects of the Invention> As is already clear from the explanation below, the present invention utilizes a plate-like material and processes a part thereof to form a seamless cylindrical shape, and the cylindrical shape of the terminal. Since the terminal has a cylindrical part, its inner and outer surfaces are smooth and there are no local unevenness or parts that are easily separated, so it has excellent strength and is easy to insert wires and attach jackets. It can be easily carried out without any trouble, can be crimped onto the wire reliably, and accidents such as poor conduction will not occur.

Moreover, the manufacturing process does not require high-temperature thermal processing, and can be expected to have the promising effect of being able to mass-produce homogeneous terminals easily and continuously by cold processing alone. I was able to do it.

[Brief explanation of the drawing]

1 to 17 show the first embodiment of the present invention, and FIG. 1 shows the entire structure! ! ! The plan views showing the processing process, Figures 2 to 17, show each process in sequence.
, 3, 4, 6.8-10, 16゜Figure 17 is a perspective view, 5th
．． Figures 7 and 9.11 are cross-sectional views taken in the direction of the arrows in Figures 4.6 and 8.10, respectively. Figures 12 to 15 are central vertical cross-sectional views of each processed part, and Figures 18 to 529 are cross-sectional views of the second implementation. For example, Fig. fjS18 is a plan view showing the overall manufacturing process, Figs. fjS19 to Fig. 29 show each process in sequence, Figs.
Figures 27 to 27 are central vertical cross-sectional views of each processed part, Figures 30 and 27 are
Figure 31 is a perspective view and central vertical sectional view showing an example of how the terminal is used, Figures 32 to 34 are perspective views showing the punching process for terminals of other shapes, and Figure 135 is a perspective view of a pond-shaped terminal. Figure 36 is a central vertical sectional view during the processing process, Figure 37
The figure is a perspective view showing a conventional terminal. In the figure, (1) is the terminal, (1a) is the connection part, (1b)
is the cylindrical part, (2) is the strip material, (3) is the sprocket hole, (4)
is the disk part, (5) is the anterior part, (5a) is the bottom part, (5b)
is a hole. Figure 12 Figure 13 Figure 14

Claims (1)

[Scope of Claims] [1] An electric wire terminal (
1), the entire terminal is formed of a series of metal plates,
An electric wire terminal in which the cylindrical portion (1b) is formed into a seamless cylindrical shape by drawing the plate material. [2] Claim No. 1 in which the metal plate material is a copper plate material
Wire terminals listed in section. [3] Claim No. 2 in which the metal plate material is a copper alloy plate material [
The electric wire terminal described in item 1]. [4] Claim No. [4] The metal plate material is an aluminum plate material.
The electric wire terminal described in item 1]. [5] The electric wire terminal according to claim [1], wherein the electrical connection portion (1a) and the cylindrical portion (1b) are formed in a circular plane direction. [6] The electric wire terminal according to claim [1], wherein the electrical connection portion (1a) and the cylindrical portion (1b) are formed in substantially orthogonal directions. [7] A step of forming a sprocket hole (3) and a disk portion (4) in a metal strip-shaped material (2) rich in conductivity and ductility, and converting the disk portion (4) into a bottomed cylindrical portion (5). a drawing process to deform the bottom part (5a), a drilling process to form a hole (5b) in the bottom (5a) of the bottomed cylindrical part (5);
), and a die-cutting process in which the tip end of the terminal connected to the cylindrical portion (1b) is formed by die-cutting from a band-shaped material (2). Method. [8] The method for manufacturing a wire terminal according to claim 7, wherein the disk portion (4) is formed after the feed hole (3) is formed in the metal strip material (2). [9] The method for manufacturing an electric wire terminal according to claim 7, wherein the feed hole (3) is formed after the disk portion (4) is formed on the metal strip material (2). [10] Spoke hole (3) and disc part (
4) and the method for manufacturing an electric wire terminal according to claim [7]. [11] The method for manufacturing an electric wire terminal according to claim [7], wherein the drawing process is three steps. [12] The method for manufacturing an electric wire terminal according to claim [7], wherein the drawing process includes five steps. [13] The method for manufacturing an electric wire terminal according to claim [7], wherein the drawing process includes eight steps. [14] Between the surface shaping process and the die cutting process, the cylindrical part (
The method for manufacturing an electric wire terminal according to claim 7, which includes a hole direction correction step of correcting the hole direction of 1b) to be in the same plane as the surface of the strip material (2). [15] Manufacture of the electric wire terminal according to claim [7], wherein the feed hole (3) is a connection hole (1d) formed in the tip connection portion (1a) of the round terminal (1). Method. [16] A step of forming a sprocket hole (3), a disk portion (4), and a hole (5b) in the center of the disk portion (4) in a metal strip-shaped material (2) rich in conductivity and ductility; A drawing process in which the disk part (4) is transformed into a cylindrical part (5), an end face shaping process in which the outer end surface of the cylindrical part (1b) processed into a cylindrical shape is shaped, and the cylindrical part (1b) is ) A method for manufacturing an electric wire terminal, which includes a die-cutting step of forming a terminal end side connected to the band-shaped material (2) by die-cutting. [17] Insert the sprocket hole (3) and center hole (
5b) and then forming the disk portion (4). [18] Claim No. 16, in which the central hole (5b) is formed after the disk portion (4) is formed on the metal strip material (2).
] The method for manufacturing the electric wire terminal described in section. [19] A disk part (4) and a central hole (
5b) and 5b) at the same time. [20] Spoke hole (3) and disc part (
4) and the central hole (5b) are formed at the same time. [21] The method for manufacturing an electric wire terminal according to claim [16], wherein the drawing process is three steps. [22] The method for manufacturing an electric wire terminal according to claim [16], wherein the drawing process includes five steps. [23] The method for manufacturing an electric wire terminal according to claim [16], wherein the patterning process includes eight steps. [24] Between the surface shaping process and the die cutting process, the cylindrical part (
Claim [16] including a hole direction correction step of correcting the hole direction of 1b) to be in the same plane as the surface of the strip material (2)
The method for manufacturing the electric wire terminal described in . [25] Manufacture of the electric wire terminal according to claim [16], wherein the feed hole (3) is a connection hole (1d) formed in the tip connection part (1a) of the round terminal (1). Method.