JPH0217914B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for attaching terminals to electronic components such as variable resistors.

BACKGROUND OF THE INVENTION In recent years, ceramics have been increasingly used in electronic components. When using a ceramic substrate as a ceramic substrate, it is highly brittle, so when attaching an eyelet terminal, a shocking force is applied to the eyelet of the terminal using a commonly used punch, causing the eyelet to plastically deform. No crimping method is used. Instead, after inserting the eyelet of the terminal into the board, use a punch that rotates around the centerline of the eyelet while maintaining a constant angle with respect to the centerline of the eyelet, and then insert the eyelet in the normal direction. A method of caulking is used.

A conventional terminal mounting method will be explained below with reference to the drawings.

Figure 2 is a sectional view of the conventional terminal mounting method before crimping, Figure 3 is a sectional view showing the relationship between the punch and eyelet during crimping, and Figure 4a is the state of the eyelet after crimping. FIG. 4b is a plan view as well. Further, in FIGS. 2 to 4, 1 is a board, 2 is a terminal, 3 is an eyelet portion of this terminal 2, and 4 is a caulking punch.

In FIG. 2, the eyelet part 3 of the terminal 2 is attached to the board 1.
After inserting the punch 4, the punch 4 makes a certain angle to the center line of the eyelet part 3, rotates around the center line of the eyelet part 3, and applies pressure to the eyelet part 3 in the direction of the arrow. . Further, as shown in FIG. 3, the punch 4 rotates while pushing the eyelet portion 3 outward, that is, in the normal direction of the eyelet portion 3 in FIG. 4b, while crimping it. After crimping, the eyelet portion 3 is expanded in the normal direction along the substrate 1, as shown in FIG. 4a, and the terminal 2 is fixed to the substrate 1.

Problems to be Solved by the Invention However, in the above method, since the punch 4 has a certain angle with respect to the center line of the eyelet part 3, the moment the punch 4 hits the eyelet part 3, the eyelet A diagonal force is applied to the portion 3 as shown by the arrow in FIG. For this reason, the eyelet portion 3 is inclined diagonally, which tends to cause instability such as cracking of the board 1 and weakening of the attachment of the terminal 2 by caulking.

Further, the diameter of the hole at the tip of the eyelet portion 3 tends to vary due to processing, and this becomes a major cause of variation in caulking.

As described above, the conventional terminal attachment method has the disadvantage that it is difficult to achieve stable terminal attachment.

SUMMARY OF THE INVENTION In view of the above drawbacks, the present invention seeks to provide a terminal attachment method that allows stable terminal attachment through caulking with little variation.

Means for Solving the Problem In order to achieve this object, the terminal attachment method of the present invention involves inserting the eyelet of the terminal into a hole provided in the board, and curling or tufting the tip of the eyelet in advance. It is temporarily caulked with a slight gap between it and the substrate, and then caulked with a rotating punch while maintaining a constant angle with respect to the center line of the eyelet so that the eyelet expands in the normal direction. It is.

Effect: With this method, the diagonal force that the eyelet receives from the punch is concentrated on the curled or tangled portion at the tip of the eyelet due to temporary crimping, and becomes a force that pushes the eyelet apart in the normal direction. The force required to tilt the eyelet portion diagonally becomes smaller, making it difficult to tilt diagonally. In addition, the hole size at the end of the eyelet is also expanded by the temporary crimping punch, reducing variation in crimping, thereby reducing variation in crimping.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing the relationship between the punch and the eyelet at the moment when the punch hits the tip of the temporarily crimped eyelet. In FIG. 1, 5 is a substrate, 6
is a terminal, 7 is an eyelet portion of this terminal 6, and 8 is a temporarily caulked portion at the tip of this eyelet portion 7. Further, 9 indicates a punch.

In FIG. 1, at the moment when the punch 9 hits the eyelet 7, the eyelet 7 receives a diagonal force from the punch 9, but this force is in a direction that presses the temporarily caulked part 8 at the tip of the eyelet 7 against the board 5. It becomes the power to spread the word.
Moreover, the effect is equivalent to that of shortening the length of the eyelet part 7 by the temporary crimping, and the moment applied to the eyelet part 7 by the punch 9 is also reduced. Therefore, the effect of tilting the eyelet portion 7 as seen in the conventional example is reduced.

In addition, even if there is variation in the hole diameter at the tip of the eyelet part 7, it can be pushed out by the temporary caulking punch 9, so it is possible to reduce variation in the hole size at the location where the punch 9 hits, reducing variation in caulking. can do.

Effects of the Invention As described above, in the present invention, the tip of the eyelet is temporarily crimped in a curled or lapped shape with a slight gap between it and the substrate, and then fixed at a certain angle with respect to the center line of the eyelet. By caulking the eyelet part with a rotating punch while maintaining the lattice shape so as to spread it in the normal direction, stable attachment of the terminal can be ensured, and this has a great practical effect.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view illustrating an embodiment of the terminal mounting method according to the present invention, Fig. 2 is a cross-sectional view of the conventional example before caulking, and Fig. 3 is the relationship between the punch and the terminal during caulking in the conventional example. 4th cross-sectional view showing
Figure a is a sectional view showing the state of the conventional example after caulking, and Figure 4b is a plan view of the same. 5... Board, 6... Terminal, 7... Terminal eyelet, 8... Temporary caulking part of terminal eyelet, 9... Punch.

Claims (1)

[Claims] 1 Insert the eyelet part of the terminal into the hole made in the board,
Temporarily tighten the tip of this eyelet in a curled or tuck-like shape with a slight gap between it and the above board, and then use a rotating punch to tighten the eyelet while maintaining a constant angle with respect to the center line of the eyelet. A terminal attachment method characterized by caulking the parts so as to spread in the normal direction.