JPS6293879A - Manufacture of self-supporting terminal of electric machine - 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 the Invention The present invention relates to a method for manufacturing a self-supporting terminal for printed circuit board mounted electrical equipment such as relays and switches.

Summary of the Invention The present invention involves expanding a pair of side pieces separated by a slit approximately at the center in the width direction of a self-supporting terminal in opposite directions in the plate thickness direction, and placing the self-supporting terminal in a resin molding die. By molding the base with resin while inserting the protruding part in a resin molding mold, post-processing of the bulging part of the free-standing terminal is unnecessary, and the seal is applied to the back of the base. It is designed to prevent the occurrence of cracks, smearing, etc. of the agent.

Conventional technology and its companion A Conventionally, as shown in Figure 4, the self-sulphurous terminal l of electrical equipment is
A curved external projecting portion is provided over the entire width direction, and this curved portion 1a is pressed against the inner wall of the hole in the printed circuit board and is soldered to fix the electric device on the printed circuit board. Become. Although not shown in the drawings, another independent terminal is installed in another row at a position offset from the terminal l.

However, in this case, the curved portion 1a of the free-standing terminal 1
The self-supporting terminal 1 is attached to the hole of the base 2 by press-fitting or insert molding, and then the terminal 1 is formed by post-processing using a press.
Problems include scratches and loss during post-processing at the base of the base 2, cracks in the sole agent applied to the back of the base 2, which impairs the sole properties, and flux and cleaning liquid entering the inside of the electrical equipment. is occurring. Furthermore, when the free-standing terminal I is press-fitted into the hole of the printed circuit board, stress concentrates on the base of the terminal 1, causing the base to bend in one direction.
[r: What are you doing to solve the problem of cracks forming in the sealant as in X?

Note that it is conceivable to form the curved part 1a in advance through pre-processing and insert molding it on the base, but if a deformed part like the curved part 1a exists in the insert part, it is complicated to hold it with a resin molding die. However, it is impossible and impractical to produce multiple pieces.

Therefore, in the method of manufacturing a self-supporting terminal for an electrical device according to the present invention, the self-supporting terminal is formed from a thin plate of an elastic material, and a slit is formed approximately at the center in the width direction. , the pair of side pieces separated by the slit are bulged in mutually opposite directions in the plate thickness direction, and the self-supporting terminal is placed in a resin molding die. ) The base is resin-molded in a state in which it is insert-molded so that it is sandwiched between resin molding molds that cover the bulge.

In other words, in the above manufacturing method, a bulge is formed in the free-standing terminal in a pre-processing process, and this bulge is fixed in a resin molding die during insert molding of the base and is once deformed into a flat shape. However, when it is removed from the mold after resin molding, it returns to its original state due to its own elastic force, and becomes the same form as the bulge formed in the post-processing. That is, in the manufacturing method of the present invention, the self-supporting terminal is treated like a straight component without bending during insert molding, and the advantage of multi-piece molding is not lost.

Embodiment FIG. 1 shows a free-standing terminal 10 used in the manufacturing method according to the present invention, which is made of a thin plate of elastic material and has a protruding portion 10a that will protrude from the base of an electrical device (not shown) after manufacturing.
A slit 11 is formed at the center in the width direction, and the pair of side pieces separated by the slit 11 are deformed in opposite directions in the plate thickness direction to form a bulge curved in an arc shape. Part 12a.

12b.

FIG. 2 shows another self-supporting terminal used in the manufacturing method according to the present invention, similar to the one shown in FIG.

For each of the two self-supporting terminals 1O, first, the protrusion 10a is press-fitted into a slit of a resin molding die (lower die) 15 and held as shown in FIG. 3a. At this time, the bulges rl12a, 12b
is pinched by the mold I5 and deformed into a flat shape. next,
As shown in FIG. 3b, a resin molding die (upper die) 1G is stacked on the die 15, and the base 2 is being molded by injecting molten resin into the cavity. When the base 2 is taken out from the mold 15.16 after it has hardened, there is a bulge! 2a, I
2b is restored to its original state by its own elastic force, and bulges 12a and 12b are formed in post-processing to take the same form as the Muni.By the way, the 10 free-standing terminals are attached to the printed circuit board like conventional free-standing terminals. It is press-fitted into the hole and soldered. At this time, the bulging portions 12a and 12b are evenly pressed against the inner wall of the hole, and the root portion of the protruding portion 10a is not bent or bent. In addition, the solder intrudes into the slit 11, thereby improving the fixing strength.

Note that the upper end of the slit II needs to be stopped at a position where it does not come into contact with the sealant so as not to adversely affect the sealant applied to the back surface of the base 2. Moreover, the bulge part 12a.

The dimension X of +2b needs to be slightly larger than the width dimension of the hole in the printed circuit board.

Effects of the Invention As is clear from the above explanation, according to the present invention, a pair of side pieces separated by a slit at approximately the center in the width direction of a self-supporting terminal are bulged in mutually opposite directions in the thickness direction. In this case, the base is molded with resin after inserting the direct free-standing terminal into the resin molding mold so that its bulging part is sandwiched between the resin molding molds.1. Terminals are treated like straight insert parts, and can be made in large numbers. In addition, there is no need to post-process the bulge, unlike the conventional method where cracks occur in the sole compound during post-processing of the bulge, preventing soldering of the terminals, and flux and cleaning fluid leaking into the electrical equipment during cleaning. There is no possibility of intrusion. Additionally, when a free-standing terminal is press-fitted into a hole in a printed circuit board, the bulge will come into even pressure contact with the inner wall of the hole, which may cause the base of the terminal to bend or bend, causing cracks in the sealant. removed. Furthermore, slits are formed in the self-supporting terminals, and when soldering, the solder sometimes penetrates into the slits, making the fixing strength even stronger.

[Brief explanation of drawings]

1 and 2 are perspective views of a self-supporting terminal used in the manufacturing method of the present invention, and FIGS. 3a and 3b show an embodiment of the self-supporting terminal manufacturing method according to the present invention. Explanatory diagram, 4th
The figure is a perspective view of an electrical device equipped with a conventional self-supporting terminal. 2...Base, 10...Self-supporting terminal, IOa...Protrusion, 11-Slab), I2a, l2b
1.1 Output, 15°16 ・Resin molding metal A゛).

Claims (1)

[Claims] (1) In a free-standing terminal for an electrical device that is press-fitted into a hole in a printed circuit board, the free-standing terminal is formed of a thin plate of elastic material, and a slit is formed approximately at the center in the width direction, and a pair is separated by the slit. The side pieces of the base are made to bulge out in opposite directions in the board thickness direction, and the self-supporting terminal is inserted into a resin molding mold so that the bulging portions are sandwiched between the resin molding molds. A method for manufacturing a self-supporting terminal for electrical equipment, comprising: molding the terminal with a resin.