JP2000174408A - Printed board with mounted grommet, and automatic grommet-mounting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed board, wherein a grommet is mounted in the hole formed in it for inserting thereinto the lead of its part, and the grommet is so caulked as not to fall out of it, and thereby, reliability with respect to soldering can be improved. SOLUTION: A board 1 has an insertion hole for inserting thereinto the lead of its part, and a grommet 4 having a cylinder-form portion 4b is mounted in the hole. The end portion of the cylinder-form portion 4b protruding from the board 1 is divided into a plurality of tongue pieces 4c to caulk them in the direction of the board 1. In the tongue pieces 4c, tongue pieces 4c1 having small open angles and tongue pieces 4c2 having large open angles are provided alternately in the circumferential direction of the insertion hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed circuit board on which eyelets are mounted and an automatic eyelet mounting machine for mounting the eyelets on the printed circuit board.

[0002]

2. Description of the Related Art In a printed circuit board, one surface of the substrate is a printed circuit pattern surface, and the other surface of the substrate is a component mounting surface. Then, the lead of the component is inserted into the insertion hole formed in the substrate, and the lead is soldered to a land formed around the insertion hole. At this time, when mounting a heavy component or a component that generates heat, it is general to attach an eyelet to the insertion hole in advance.

[0005] FIG. 5 is a view showing a step of mounting an eyelet in an insertion hole of a substrate by an automatic eyelet mounting machine. In FIG. 5, an insertion hole 2 for inserting a lead of a component (not shown) is formed in a substrate 1. A land 3 is formed around the insertion hole 2. Above the substrate 1, an insertion suction head 5 is provided which has an eyelet 4 suction-held at its tip.

[0004] As shown in FIG.
An annular portion 4a having a diameter larger than the diameter of the annular portion 4a and a columnar portion 4b connected to the annular portion 4a. Annular part 4
“a” abuts on the surface of the substrate 1 (the surface on which components are mounted) to regulate the position of the eyelets 4. The length of the columnar portion 4b is
When the eyelet 4 is inserted into the insertion hole 2, the columnar portion 4 b projects from the substrate 1.

On the other hand, below the substrate 1, an anvil 7 in which a punch 6 for accommodating the columnar portion 4b of the eyelet 4 inserted into the insertion hole 2 and then caulking the columnar portion 4b protruding from the substrate 1 is provided. Are located. When the insertion suction head 5 moves down toward the substrate 1, the anvil 7 moves up toward the substrate 1 almost at the same time. When the columnar portion 4b of the eyelet 4 is inserted into the insertion hole 2, the tip of the punch 6 is
It is pressed against the more protruding columnar part 4b. Then
The columnar portion 4b protruding from the substrate 1 is divided into a plurality of tongues, and the tongues are swaged in the direction of the substrate 1. In this way, the eyelets 4 are mounted in the insertion holes 2 of the substrate 1.

A punch 6 in a conventional automatic eyelet mounting machine.
Is as follows. 7A is a plan view of the punch 6 viewed from above, and FIG. 7B is a plan view of the punch 6 viewed from the side. As shown in FIGS. 7A and 7B, the punch 6 includes a large-diameter portion 6a having a columnar shape and a small-diameter portion 6b having a hexagonal column shape. And the large diameter portion 6a and the small diameter portion 6b
Between one side of the hexagonal column-shaped small diameter portion 6b,
There are six inclined portions 6c surrounded by arcs obtained by dividing the outer peripheral portion of the large diameter portion 6a into six equal parts. This inclined portion 6c
All have the same shape, and have a slight concave surface as can be seen from FIG. 7 (B). A corner 6d is formed between two adjacent inclined portions 6c. The columnar portion 4b is divided into a plurality of tongue pieces by the corner portions 6d.

When the eyelet 4 is swaged using the punch 6 having such a shape, the eyelet 4 has the following shape. FIG. 8 shows a case where the swaging of the eyelet 4 by the punch 6 is strong, and FIG. 9 shows a case where the swaging of the eyelet 4 by the punch 6 is weak. In addition, eyelet 4 by punch 6
The strength of the caulking changes by adjusting the amount of rise of the anvil 7.

8A and 9A are sectional views, and FIG.
(B) is a plan view seen from the back surface of the substrate 1 (the printing surface of the land 3). In both cases of FIG. 8 in which caulking is strong and FIG. 9 in which caulking is weak, the columnar portion 4b protruding from the substrate 1 is divided into a plurality of tongue pieces 4c all having the same shape, and is bent in the direction of the substrate 1 to form a petal. Becomes In the case of FIG. 8 in which caulking is strong, the tongue piece 4c is bent to such an extent that the tip thereof contacts the land 3, and the opening angle θ from the center line of the insertion hole 2 increases. In the case of FIG.
c is slightly bent, and the opening angle θ from the center line of the insertion hole 2 becomes small.

[0009]

It is very difficult to set the swaging strength of the eyelets 4 by adjusting the amount of rise of the anvil 7 in the automatic eyelet mounting machine described above. Is often one of the cases where the crimping is weak. In order to optimally set the crimping strength of the eyelets 4, the amount of elevation of the anvil 7 must be finely adjusted, which complicates the control.

FIG. 10 shows a state of soldering when the eyelet 4 is strongly caulked as shown in FIG. In FIG. 10, the component lead 8 is inserted into the insertion hole 2 in which the eyelet 4 is mounted.
Is inserted, solder 9 is applied to the eyelet 4 and the lead 8, and the lead 8 is soldered. At this time, since there is almost no gap between the land 3 and the tongue piece 4c of the eyelet 4, the solder 9 does not enter between the land 3 and the tongue piece 4c. Only during the soldering. In such a state, there is a problem that solder cracking may occur and the reliability of soldering is reduced.

On the other hand, when the eyelet 4 is weakly swaged as shown in FIG. 9, there is a problem that the eyelet 4 may fall off before soldering.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and an eyelet falls off in a printed circuit board on which an eyelet formed by caulking an eyelet is inserted into a lead insertion hole of a component formed on the substrate. In order to provide a printed circuit board equipped with eyelets that can improve the reliability of soldering, and an eyelet automatic mounting machine for caulking eyelets into the insertion holes of the leads of the components formed on the substrate, An object of the present invention is to provide an automatic eyelet mounting machine capable of providing a printed circuit board capable of improving the reliability of soldering without falling off.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides: (1) a columnar portion provided in an insertion hole of a substrate having an insertion hole for inserting a lead of a component; In a printed circuit board on which an eyelet provided with an eyelet is mounted, and an end of the columnar portion protruding from the substrate is divided into a plurality of tongue pieces and the eyelets attached by crimping in the direction of the substrate are attached, the plurality of tongue pieces are A printed circuit board provided with eyelets, wherein the printed circuit board has a plurality of types of opening angles having different opening angles from the center line of the insertion hole toward the board, and (2) for inserting a lead of a component. An insertion means for inserting an eyelet having a columnar portion into the insertion hole of the substrate having an insertion hole, and dividing the end of the columnar portion protruding from the substrate into a plurality of tongue pieces and moving in the direction of the substrate. Pong for caulking In the eyelet automatic mounting machine provided with, the punch has a plurality of inclined portions inclined from the tip end toward the other end, the plurality of inclined portions, a plurality of types of inclined portions having different degrees of inclination The present invention provides an eyelet automatic mounting machine characterized by comprising:

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a printed circuit board on which eyelets are mounted and an automatic eyelet mounting machine according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a view showing an embodiment of a punch used in the automatic eyelet mounting machine of the present invention, FIG. 2 is a partial cross-sectional view for explaining the shape of the punch used in the automatic eyelet mounting machine of the present invention, and FIG. FIG. 4 is a cross-sectional view for explaining an effect of the printed circuit board with the eyelet mounted thereon and the automatic eyelet mounting machine of the present invention. 3 and 4, the same parts as those in FIGS. 8 to 10 are denoted by the same reference numerals.

First, the automatic eyelet mounting machine of the present invention will be described. The entire configuration of the automatic eyelet mounting machine of the present invention is the same as the conventional one described with reference to FIG. 5, but the shape of the punch for caulking the eyelets 4 is different. The method of mounting the eyelets 4 in the insertion holes 2 of the substrate 1 by the automatic eyelet mounting machine of the present invention is the same as the conventional method.

In the automatic eyelet mounting machine of the present invention, a punch 60 as shown in FIG. 1 is used. 1A is a plan view of the punch 60 as viewed from above, and FIG.
It is the top view which looked at from the side. As shown in FIGS. 1 (A) and 1 (B), the punch 60 has a columnar portion 60a as a whole except for the end on the tip side (the upper end in FIG. 1 (B)). Is a hexagonal top 60b as an example. And, between the columnar portion 60a and the top portion 60b, there are six inclined portions surrounded by one side of the hexagonal top portion 60b and an arc dividing the outer peripheral portion of the columnar portion 60a into six. 60c.

In the present invention, the outer peripheral portion of the cylindrical portion 60a is
The inclined portion 60c, which is not equally divided, includes an inclined portion 60c1 having a long arc portion on the outer peripheral portion of the columnar portion 60a and a columnar portion 60c.
The portion of the circular arc on the outer periphery of a is a short inclined portion 60c2. The inclined portion 60c is composed of an inclined portion 60c1 and an inclined portion 60c2.
It is a generic name. Therefore, the inclined portions 60c are not all the same shape, but have two different shapes for the inclined portion 60c1 and the inclined portion 60c2. As can be seen from FIG. 1B, the inclined portion 60c has a slight concave surface. A corner 60d is provided between the inclined portion 60c1 and the inclined portion 60c2. The columnar part 4b is divided into a plurality of tongue pieces by the corner part 60d.

Further, as shown in FIG. 1A, the inclined portions 60c1 and 60c2 not only have different planar shapes as viewed from above, but also have different degrees of inclination. FIG. 2 (A)
Indicates the degree of inclination of the inclined portion 60c1, and FIG.
Indicates the degree of inclination of the inclined portion 60c2. FIG.
As can be seen from (A) and (B), the inclined portion 60c1 is different from the inclined portion 60c2 in that the top portion 60b is closer to the columnar portion 60a.
The inclination of the inclined portion 60c1 is greater than the inclination of the inclined portion 60c2.

In this embodiment, the top portion 60b has a hexagonal shape. However, the present invention is not limited to this, and may be another polygonal or circular shape. The number of the inclined portions 60c surrounded by the two corner portions 60d is not limited to six, but may be another plural number. Further, in the present embodiment, as a preferred embodiment, the inclined portion 60c1 having the first inclination and the second
Although the inclined portions 60c2 having the inclination of are alternately arranged in the circumferential direction, the present invention is not limited to this, and the inclination portions 60c having three or more degrees of inclination may be used. It is sufficient that at least two inclined portions having different degrees of inclination are mixed.

When the eyelet 4 is caulked by the automatic eyelet mounting machine having the punch 60 of the present invention described above, the eyelet 4 has the following shape. In FIG. 3, (A)
Is a cross-sectional view, and (B) is the back surface of the substrate 1 (the printed surface of the land 3).
It is the top view which looked more. Columnar part 4 protruding from substrate 1
b is divided into a plurality of tongue pieces 4c by a punch 60,
It is bent in the direction of the substrate 1 to form a petal. At this time, as described above, since the inclined portion 60c of the punch 60 is composed of the steeply inclined portion 60c1 and the gentlely inclined portion 60c2, the tongue is formed between the inclined portion 60c1 and the inclined portion 60c2. The degree to which the piece 4c is bent in the direction of the substrate 1 is different.

That is, the tongue piece 4c bent at the inclined portion 60c1 has a small opening angle θ from the center line of the insertion hole 2 and cannot be bent until the tip of the tongue 4c contacts the land 3. The tongue 4c bent at the inclined portion 60c1
Called c1. On the other hand, the tongue piece 4c bent by the inclined portion 60c2 has a large opening angle θ from the center line of the insertion hole 2 and is bent to such an extent that its tip comes into contact with the land 3. The tongue piece 4c bent at the inclined portion 60c1 is referred to as a tongue piece 4c2. In the present embodiment, as shown in FIG. 3B, the first tongue pieces 4c1 having a small opening angle θ and the second tongue pieces 4c2 having a large opening angle θ are arranged alternately in the circumferential direction. . Actually, the tongue piece 4c1
Is larger than the width of the tongue piece 4c2, but for simplicity, the tongue piece 4c1 and the tongue piece 4c2 are illustrated with the same width.

By the way, the anvil 7 of the automatic eyelet mounting machine is used.
May be set as appropriate. In the present invention, even if the inclined portion 60c2 of the punch 60 is pushed into the insertion hole 2 (the columnar portion 4b of the eyelet 4) to the limit, the inclined portion 60c1 is not pressed.
Is steep, the tongue piece 4c1 bent at the inclined portion 60c1 is not bent until the tip of the tongue piece 4c1 contacts the land 3, and the opening angle θ naturally becomes smaller. Therefore, in the eyelet automatic mounting machine of the present invention, it is not necessary to finely adjust the amount of rise of the anvil 7, but only to make a rough adjustment to the extent that the eyelet 4 is caulked strongly as shown in FIG. .

FIG. 4 shows the state of soldering on the printed circuit board of the present invention in which the eyelets 4 are caulked by the automatic eyelet mounting machine of the present invention. In FIG. 4, the lead 8 of the component is inserted into the insertion hole 2 in which the eyelet 4 is mounted,
Solder 9 is applied to the eyelet 4 and the lead 8, and the lead 8 is soldered. At this time, land 3 and eyelet 4
Since there is a sufficient gap between the tongue piece 4c1 and the
Penetrates between the land 3 and the tongue piece 4c1. As a result, the solder 9 covers the entire solder joint consisting of the land 3, the tongue piece 4c, and the lead 8, so that the reliability of soldering is extremely high. Also, the tongue piece 4 having a large opening angle θ
Since c2 (not shown in FIG. 4) presses the back surface (circuit pattern surface) of the substrate 1, the eyelet 4
Does not fall off.

In this embodiment, the eyelet 4 is swaged by an automatic eyelet mounting machine having the punch 60 shown in FIG.
The printed circuit board according to the present invention was formed as shown in
If the shape of the eyelet 4 (tongue piece 4c) is as shown in FIG. 3, the effects of the present invention described with reference to FIG. Therefore, the printed circuit board on which the eyelets of the present invention are mounted is not limited to one formed by caulking the eyelets 4 by the automatic eyelet mounting machine having the punch 60 shown in FIG. 1 and is substantially identical in form. If present, all are included in the present invention. It is within the scope of the present invention if at least two types of tongue pieces 4c having different opening angles θ are mixed.

[0025]

As described in detail above, the printed circuit board provided with the eyelet of the present invention is provided with an eyelet having a columnar portion in an insertion hole of a substrate having an insertion hole for inserting a lead of a component. Inserting and dividing the end of the cylindrical portion protruding from the substrate into a plurality of tongues and caulking in the direction of the substrate, the plurality of tongues have an opening angle from the center line of the insertion hole toward the substrate. Since there are a plurality of different opening angles, the reliability of soldering can be improved without eyelets dropping off.

Further, the automatic eyelet mounting machine of the present invention has an insertion means for inserting an eyelet having a columnar portion into an insertion hole of a substrate having an insertion hole for inserting a lead of a component, and protruding from the substrate. A punch for splitting the end of the columnar portion into a plurality of tongue pieces and crimping in the direction of the substrate, wherein the punch has a plurality of inclined portions inclined from the tip to the other end. Since the plurality of inclined portions are constituted by a plurality of types of inclined portions having different degrees of inclination, a printed circuit board capable of improving the reliability of soldering without eyelets dropping is provided. It becomes possible. Furthermore, with the automatic eyelet mounting machine of the present invention, it is possible to provide a printed circuit board exhibiting the above effects without fine adjustment of the force when pressing the punch against the eyelet, and the control of the automatic eyelet mounting machine is not complicated.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a punch used in an automatic eyelet mounting machine of the present invention.

FIG. 2 is a partial sectional view for explaining the shape of a punch used in the automatic eyelet mounting machine of the present invention.

FIG. 3 is a view showing an embodiment of a printed circuit board on which the eyelets of the present invention are mounted.

FIG. 4 is a cross-sectional view for explaining the effect of the printed circuit board on which the eyelets are mounted and the automatic eyelet mounting machine of the present invention.

FIG. 5 is a view showing a step of mounting an eyelet in an insertion hole of a substrate by an automatic eyelet mounting machine.

FIG. 6 is a perspective view showing eyelets.

FIG. 7 is a view showing an example of a punch used in a conventional automatic eyelet mounting machine.

FIG. 8 is a view showing a mounting state of eyelets by a conventional automatic eyelet mounting machine.

FIG. 9 is a view showing a mounting state of eyelets by a conventional automatic eyelet mounting machine.

FIG. 10 is a cross-sectional view for explaining a problem of a printed circuit board on which eyelets are mounted by a conventional automatic eyelet mounting machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Insertion hole 3 Land 4 Eyelet 4a Annular part 4b Cylindrical part 4c, 4c1, 4c2 Tongue piece 5 Insertion suction head 7 Anvil 8 Lead 9 Solder 60 Punch 60a Columnar part 60b Top part 60c, 60c1, 60c2 Inclined part 60d Corner

Claims (5)

[Claims] An eyelet having a columnar portion is inserted into the insertion hole of a substrate having an insertion hole for inserting a lead of a component, and an end of the columnar portion protruding from the substrate is inserted into a plurality of ends. In a printed circuit board having eyelets that are divided into tongue pieces and crimped in the direction of the board, the plurality of tongue pieces may have a plurality of types of opening angles different from the center line of the insertion hole toward the board. A printed circuit board on which eyelets are mounted. 2. The plurality of tongue pieces have a first tongue piece having a first opening angle and a second tongue piece having a second opening angle larger than the first tongue piece. 2. The printed circuit board according to claim 1, wherein the printed circuit boards are provided alternately in the circumferential direction. 3. An insertion means for inserting an eyelet having a columnar portion into the insertion hole of a substrate having an insertion hole for inserting a lead of a component, and an end of the columnar portion protruding from the substrate. And a punch for caulking in the direction of the substrate while dividing the tongue into a plurality of tongue pieces, wherein the punch has a plurality of inclined portions inclined from the tip end toward the other end. The eyelet automatic mounting machine is characterized in that the plurality of inclined portions include a plurality of types of inclined portions having different degrees of inclination. 4. The plurality of inclined portions include a first inclined portion having a first inclined portion, and a second inclined portion having a second inclined portion whose degree is smaller than that of the first inclined portion. 4. The automatic eyelet mounting machine according to claim 3, wherein the eyelets are provided alternately in the circumferential direction. 5. The method according to claim 2, wherein the insertion means is provided with a columnar portion in the insertion hole of the substrate having an insertion hole for inserting a lead of a component. A printed circuit board equipped with an eyelet, wherein an end of the columnar portion protruding from the substrate is divided into a plurality of tongue pieces and caulked in the direction of the substrate by the punch. .