JPS60189879A - Press-bonding stationary terminal and method of producing 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 [Field of Application of the Invention] The present invention relates to a method for mechanically fixing and electrically connecting a press-fitting portion of a terminal by press-fitting an electrical conductor terminal into a null-hole portion of a printed wiring board. The present invention relates to a structure and a method of manufacturing the terminal.

[Background of the invention]

Conventionally, in this type of terminal, the structure of the part that is press-fitted into the through-hole part of the printed wiring board is: firstly, a hollow hole is provided to form a beam structure, and secondly, a metal plate is cut and bent. The third type of beam structure was an accordion structure with a cross-sectional shape such as M, W, N, or V, and the fourth type was a so-called split bottle structure with a U-groove in cross-section and an arcuate outer shape. .

However, in the conventional structure described above, the following five problems occur.
There was a drawback. First of all. In the second conventional structure, hollow hole machining or cutting and bending machining makes it difficult to downsize, and therefore it is difficult to achieve high-density mounting of electronic parts on the printed wiring board. In addition, in the sixth conventional structure, the part that comes into contact with the through hole is a limited and small part, so in order to obtain the necessary mechanical fixing force after press-fitting, a large force must be applied to the small part of the through hole. As a result, there is a risk of through-hole crushing damage. Further, in the fourth conventional structure, since the outer shape is an arc, there is a risk that the terminal may slip and rotate within the through hole due to the torque applied to the terminal when, for example, winding or wiring is applied to the terminal after press-fitting.

[Purpose of the invention]

An object of the present invention is to provide a press-fit fixed terminal that achieves stable mechanical fixation and electrical connection in a compact size without through-hole crushing damage, and a method for manufacturing the same.

[Summary of the invention]

According to the present invention, the cross-sectional shape of the press-fitting part of the terminal is U-shaped on the inside, and has a plurality of circular arc parts and a plurality of straight parts on the outside, so that the cross-sectional shape of the press-fitting part of the terminal is formed into a U-shape, and the outside has a plurality of circular arc parts and a plurality of straight parts. is characterized by a configuration in which the connection is stabilized by concentrating the force in the radial direction at a plurality of circular arc parts.

[Embodiments of the invention].

Hereinafter, the present invention will be explained in detail with reference to an embodiment shown in the drawings. FIG. 1 shows a terminal 3 according to the present invention on a printed wiring board 1.
FIG. 3 is a perspective view showing the process of press-fitting into a null hole 2 provided in FIG. The terminal 6 is made of an electrical conductor such as a copper alloy, and its press-fit portion 4 is press-fitted into the through hole 2, and is fixed to the printed wiring board 1 like a terminal 6'.

Here, the cross-sectional shape of the press-fitting part 4 of the terminal 3 is shown in FIG.
As shown in FIG.
, 6b, 6c, 6d and a plurality of straight portions 7α, 7h,
7c are combined alternately.

FIG. 6 is a sectional view showing a state in which the press-fitting portion 4 of the terminal 6 is press-fitted into the through-hole 2. The inner wall conductor 8 of the through hole 2 and the press-fitted part 4' of the terminal 3 are connected to the circular arc parts 6α, 6b of the terminal 3.
, 1. Contact only at c and 6d, straight portions 7α, 74
, 7c, there is no contact. Here, the terminal press-fitting part 4' contracts due to the force directed toward the center by the through-hole inner wall conductor 8, but the shrinkage reaction force of the press-fitting part 4' is caused by the circular arc parts 6α, 6h, 6c.
, 6cl is intensively received at the contact area, resulting in a strong contact.

Next, the method for manufacturing the terminal 3 shown in FIGS. 1 to 3 is as follows.
This will be explained with reference to FIGS. 4 to 6.

4(α) to (C) are plan views showing the process of obtaining the terminal 6 shown in FIG. 1 from a metal plate, and FIG. C) is a cross-sectional view of the main part of the Brène mold to be processed, and the sixth slot (α9 to (C) is an enlarged cross-sectional view taken along the line XX of FIG. 4 (LJ to (C)), respectively.

First, metal plate M shown in FIG. 4 (α) and FIG. 5 (cL)
Then, cut out the cutting dies 9 (male die 9α, female die 9
In step b), unnecessary portions of the peripheral edge of the terminal roller α are punched out, and the press-fitted portion 4α has a rectangular cross-section as shown in FIG. 6(α). Incidentally, the upper and lower ends of the terminal 3α are provided with, for example, V-shaped notches in order to facilitate the subsequent cutting process. Of course, this cut is made using the cutting die 9 shown in Fig. 5 (α).
can be formed by

Next, press-fit part 4 having a rectangular cross section as shown in FIG. 6(α)
α is the first drawing die 10 (male die 10
α, female mold 10h) is used for drawing processing, as shown in Fig. 6(b).
), it is processed into a substantially V-shaped press-fit portion 4h. The plan view is shown in Figure 4.

The approximately V-shaped press-fit portion 4h shown in FIG.
The second drawing die 11 (male die 11α female die 11 shown in figure C)
The second drawing process is performed by h), and the
In other words, a press-fitting part 4b" as shown in FIG. 2 is obtained. Its plan view is shown in FIG. - The lower end is separated from the metal plate M to form the terminal 3 shown in FIG.

In the above manufacturing process, there are two drawing steps, but depending on the processing conditions, there may be one or three or more drawing steps. In addition, in Fig. 5, it was explained that the three press dies were operated independently to speed up understanding, but for example, the six press dies shown in Fig. 5(a) to <cr are operated in the feeding direction of the metal plate M. The press drive system can be further simplified by arranging the six Brene rollers in parallel at a position four times the pitch between the terminals δα (n is an integer of 1 or more) so that they can operate simultaneously.

〔Effect of the invention〕

According to the present invention, force is concentrated at a plurality of partially arcuate portions at the contact portion between the terminal and the inner wall of the null hole, so that mechanically strong fixation and electrically stable connection can be obtained. . In addition, since the contact area for the inner wall of the through-hole and the arc of the contact area of the terminal are almost concentric, the contact surfaces fit well with each other, and even if force is concentrated, the conductor on the inner wall of the through-hole will not be crushed and damaged, increasing reliability. On the other hand, the cross-sectional shape is based on U-groove formation, which is a specialty of micro-press processing, so it is fully compatible with miniaturization.

[Brief explanation of the drawing]

The drawings all show one embodiment of the present invention, and FIG. 1 is an overall perspective view, FIG. 2 is a cross-sectional view of the press-fitting part of the terminal, and FIG. 6 is the press-fitting part of the terminal in a state where it is press-fitted into a through hole. 4(α) to (C) are plan views showing the manufacturing process of the terminal, FIGS. 5(α) to (C) are sectional views of the main parts of the press die, and FIGS. 6(a) to (C-n are respectively shown in Figure 4 (α) ~ (
It is an XX enlarged sectional view of C). 1・・・・・・・・・・・・Printed wiring board 2・・・・−・
......Through hole 3...Terminal 4...Press-fitting part 5...
・・・・・・U groove 6・・・・・・・・・・・・Circular part 7
・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・
......... Cutting die 10... First drawing die 11... Second drawing die 11 Figure Atsushi 2 Figure h' Figure 4 菟S figure

Claims (1)

[Claims] 1. In a terminal that is press-fitted into a through-hole portion of a printed wiring board, the cross-sectional shape of the press-fitted portion of the terminal is U-shaped on the inside, and has a plurality of arcuate portions and a plurality of circular arc portions on the outside. A press-fit fixed terminal characterized in that the arcuate portion is formed as a press-contact portion to the null-hole portion. 2. The device according to claim 1, characterized in that the four circular arc portions are formed, and a straight line portion is formed between the circular arc portions, and the four circular arc portions are configured as pressure contact portions. Press-fit fixed terminal. 3. A first step of punching out unnecessary portions of the peripheral edge of the terminal while leaving the terminal in place from the metal plate; and a second step of processing the press-fitting portion of the terminal left in the first step into a substantially V-shaped cross-section; A sixth step in which the substantially V-shaped cross-sectional shape processed in the second step is further processed to have a U-shape on the inside and a plurality of circular arc parts and a plurality of straight parts on the outside.
and a fourth step of cutting the terminal from the metal plate after the third step.