JPH0227788A - Fixing method for caulking type joint terminal - Google Patents

Abstract

PURPOSE:To prevent the lowering of fixing strength by expanding a projecting part from a printed wiring board of a caulking type joint terminal by a punch which has a recess and a projection on the tapered part thereof and producing cracks on the expanded part to eliminate the loose in the rotating direction of the joint terminal. CONSTITUTION:A small diameter part 14 of a caulking type joint terminal 2 is inserted in a hole 29 of a printed wiring board 28 whose wiring pattern 26 is formed. A punch 18 is used to shock the small diameter part 14 projected at the forming side of the wiring pattern 26 of the wiring plate 28 and the small diameter part 14 is expanded in the surface direction of the wiring plate 28 to deform. Since at this time a recess and a projection 24 are formed on the punch 18, cracks are produced on an expanded part 14' and cut into the upper end part of the wall face of the hole 29 through the pattern 26. The loose in the rotating direction of the terminal 2 is eliminated and the lowering of soldering strength of the expanded part 14' can be prevented.

Description

[Detailed Description of the Invention] Summary Regarding a method for fixing a caulking type relay terminal to a printed wiring board, the present invention relates to a method for fixing a caulking type relay terminal in which the fixing strength does not decrease even if electronic components are attached and detached several times by soldering. For the purpose of providing
In this method for fixing a caulking type relay terminal, in which the caulking type relay terminal is fixed to a printed wiring board by expanding the portion of the caulking type relay terminal protruding from the printed wiring board with a punch, the punch has a tapered shape. A punch having an unevenness on the tapered surface is used to create a crack in the extended portion of the caulked relay terminal.

Industrial Application Field The present invention is applied to w1. This invention relates to a method for fixing a terminal to a printed wiring board.

In the field of electronic device manufacturing, electronic circuits are constructed by mounting electronic components such as integrated circuits, resistors, and capacitors on printed wiring boards on which wiring patterns are formed, and then soldering the electronic components and wiring patterns. That's what I do. For electronic components in areas that do not require adjustment of circuit constants, once they have been soldered they will not be removed until they fail, but for electronic components in areas that require adjustment of circuit constants, The electrical characteristics are changed in various ways, and the parts are fixed once the optimal characteristic values are determined. For this reason, electronic components in portions that require adjustment of circuit constants are connected to the wiring pattern via relay terminals in order to facilitate attachment and detachment. There is a caulking type as a general form of the inner core, and there is a demand for a highly reliable fixing method in terms of fixing strength.

2. Description of the Related Art Conventionally, when fixing a caulking type relay terminal to a printed wiring board, a punch 42 having a tapered portion 40 or a punch 46 having a protruding portion 44 as shown in FIG. 7 is used.
As shown in FIG. 8, printed wiring board 480 hole 50
The caulking type relay terminal 52 inserted into the terminal was caulked. The crimping here means the printed wiring board 4.
This refers to applying an impact with a punch to the upwardly protruding portion in Figure 8 to expand the protruding portion. In FIG. 8, the caulked portion can be soldered to the wiring pattern 54 on the printed wiring board 48 to further strengthen the mechanical fixation and electrical connection.

FIG. 9 is a perspective view showing an example of use of a caulking type relay terminal. Caulk type relay terminal 5 fixed to printed wiring board 48
The electronic component 56 is temporarily fixed by inserting the lead of an electronic component 56 such as a resistor into the insertion hole 2 and soldering the inserted portion. In case 1, when inserting and fixing the lead of an electronic component using a relay terminal, it can be fixed with a relatively small amount of solder, so the electronic component can be easily removed by remelting the solder. be able to.

Problems to be Solved by the Invention In the usage example of the caulking type relay terminal as described above, when electronic components are repeatedly attached and detached from the relay terminal, the amount of solder used for soldering accumulates and the amount of solder increases. When heated to remove the relay terminal, even half of the wire connecting the relay terminal and the wiring pattern melts, making the soldering of that part unreliable. In other words, since the relay terminal has play in its rotational direction, if the relay terminal moves due to the play when the soldering part with the wiring pattern melts, the solder solidification structure will be defective, resulting in so-called potato sticking. This may result in soldering.

The present invention was created in view of these problems.
The purpose of the present invention is to provide a method for fixing a caulking type relay terminal in which the fixing strength does not decrease even if an electronic component is attached and detached several times by soldering.

Means for Solving the Problems The method of fixing a caulked relay terminal of the present invention is to attach the caulked relay terminal to a hole in a printed wiring board, and expand the portion of the caulked relay terminal protruding from the printed wiring board with a punch. By doing so, it can be used for fixing a caulking type relay terminal to a printed wiring board.

In the first method according to the present invention, a punch having a tapered shape and having unevenness on the tapered surface is used as the punch to cause a crack in the expanded portion of the caulked relay terminal.

In the second method according to the present invention, irregularities are provided on the outer periphery of the portion of the caulked relay terminal that protrudes from the printed wiring board.

According to the first method of the present invention, the portion of the caulked relay terminal that protrudes from the printed wiring board is expanded using a punch having unevenness on the tapered surface, and a crack is generated in the expanded portion. As a result, this crack digs into the hole wall of the printed wiring board, eliminating play in the rotational direction of the caulked relay terminal.

As a result, even if the electronic component is attached and detached several times by soldering, its fixing strength will not decrease.

According to the second method of the present invention, the unevenness provided on the outer periphery of the portion of the caulked relay terminal protruding from the printed wiring board bites into the hole wall surface of the printed wiring board, so that the same effect as in the first method is achieved. occurs.

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

FIG. 3 is a partially sectional front view of a caulking type relay terminal that can be used to implement the present invention. This caulking type relay terminal 2 is integrally composed of a large diameter part 4.6.8 and a small diameter part 10, 12.14, and the small diameter part 14 located at the end thereof is connected to a printed wiring board. It can be inserted into the hole. Reference numeral 16 denotes an insertion hole passing through the caulked relay terminal 2 in the longitudinal direction, into which a lead of an electronic component can be inserted. As the material of the caulking type relay terminal 2, for example, brass, which can be soldered, can be used.

The reason why the relay terminal has a large diameter part and a small diameter part is because it is necessary to attach the leads when there are multiple leads of an electronic component to be fixed to the relay terminal, or when an electronic component whose characteristic values have been determined is to be attached last. This is to wrap around the small diameter part.

FIG. 4 is a front view of a punch that can be used in carrying out the present invention. This punch 18 consists of a first taper part 20 and a second taper part 22, and when the relay terminal is caulked, the second taper part 22 collides with the relay terminal.

Therefore, the shape and amount of deformation of the caulked portion can be adjusted by adjusting the taper angle of the second tapered portion 22. In this embodiment, the unevenness 24 is mainly provided on the second tapered portion 22, and therefore, when the relay terminal is crimped, cracks are generated in the crimped portion (extended portion of the crimped type relay terminal).

FIG. 1 is a process chart for specifically explaining the first method of the present invention. First, as shown in FIG.
Insert the small diameter portion 14 of the caulked relay terminal 2 into the . next,
Using the punch 18 shown in FIG.
An impact is applied to the small diameter portion 14 to expand it toward the surface of the printed wiring board 28, thereby deforming it at an angle of 14° as shown in FIG. 1(b). At this time, since the punch 18 has the unevenness 24 formed therein, a crack is generated in the expanded portion 14° as shown in FIG. Dig in. As a result, there is no play in the rotational direction of the caulked relay terminal 2, and when the extension part 14' is fixed to the wiring pattern 26 by soldering, even if the electronic component is attached and detached multiple times, the extension 814'
There is no risk of reducing strength when soldering.

5 and 6 are a perspective view and a sectional view showing a specific embodiment of the second method of the present invention. An unevenness 32 is formed in advance on the small diameter part of the caulking type relay terminal 30 by, for example, knurling, this small diameter part is inserted into the hole 29, and the small diameter part is caulked with a punch to form a shape as shown by 32' in FIG. This is a modified version of the unevenness. In this way, when the small diameter portion of the relay terminal is provided with unevenness, the punch 42 or 4 in the conventional method shown in FIG.
Even if 6 is used, the deformed unevenness 32' digs into the upper end of the wall surface of the hole 29 through the wiring pattern 26, so there is no play in the rotational direction of the caulked relay terminal 30, and the result is similar to the first method. produce an effect.

Effects of the Invention As detailed above, according to the present invention, the caulked relay terminal can be fixed to the printed wiring board without play in its rotational direction, so electronic components can be soldered multiple times. Even if it is attached and detached, there is no possibility that the fixing strength will decrease.

FIG. 7 to FIG. 9 are diagrams for explaining the prior art.

2.30...Caulking type medium m terminal, 18... Punch, 26...Wiring pattern, 28...Printed wiring board.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing a specific example of the first method of the present invention, FIG. 2 is a perspective view of an expanded portion formed by the same method, and FIG. 3 is a diagram that can be used to implement the present invention. FIG. 4 is a front view of a punch that can be used to carry out the present invention; FIG. 5 is a perspective view showing a specific embodiment of the second method of the present invention; Figure 6 is a sectional view showing the same embodiment;

Claims (2)

[Claims] (1) Attach a caulking type relay terminal to the hole (29) of the printed wiring board (28), and use a punch to expand the part of the caulking type relay terminal that protrudes from the printed wiring board (28). Printed wiring board (
28) In the method for fixing a caulking type relay terminal, a punch (18) having a tapered shape and having unevenness (24) on the tapered surface is used as the punch, and the caulking type relay terminal is fixed to the caulking type relay terminal. A method for fixing a caulking type relay terminal, characterized in that a crack is generated in the expanded portion. (2) Attach a caulking type relay terminal to the hole (29) of the printed wiring board (28), and use a punch to expand the part of the caulking type relay terminal that protrudes from the printed wiring board (28). Printed wiring board (
28) A method for fixing a caulking type relay terminal to a caulking type relay terminal, characterized in that an unevenness (32) is provided on the outer periphery of a portion of the caulking type relay terminal protruding from the printed wiring board (28). How to fix the terminal.