JPH0685384B2 - Electrolytic capacitor terminal crimping method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method of crimping a terminal on a terminal plate of a large-sized electrolytic capacitor used in electronic equipment and the like.

(B) Conventional technology The conventional terminal crimping method for electrolytic capacitors is
As shown in FIGS. 6 and 6, the straight rivet 8 welded to the terminal 3 is inserted into the phenol resin laminated plate 9 to which the rubber plate 9a constituting the terminal plate is attached from the rubber plate 9a side, and the straight rivet 8 is penetrated. The washer 6 is fitted to the tip of the rivet, and the tip of the straight rivet 8 is pressed and buckled by a crimping tool (not shown), so that the terminal 3 with the straight rivet 8 is attached to the rubber plate 9a. I was crimping to 9.

(C) Problems to be Solved by the Invention When the straight rivet 8 is crimped to the phenol resin laminated plate 9 to which the rubber plate 9a is attached by a crimping tool,
As shown in the figure, the shaft peripheral surface of the lower neck portion of the straight rivet 8 buckles in the radial direction, and the insertion hole 9c of the phenol resin laminated plate 9b to which the rubber plate 9a is attached is closed, but the electrolytic capacitor has Since the electrolyte solution is filled, the airtightness of the portion of the insertion hole 9c needs to be sufficiently maintained. In this case, if the caulking force is increased and the buckling amount of the straight rivet 8 is increased, the sealing degree of the insertion hole 9c is improved,
Buckling force against phenol resin plate 9b is phenol resin plate
If the breaking stress of 9b is exceeded, the phenol resin plate 9b may be cracked. Thus, in the conventional caulking direction, the elastic force of the rubber plate 9a itself and the straight shape of the rivet 8 reduce the degree of adhesion to the rubber plate 9a due to buckling, and as a result, the straight rivet 8 and the rubber plate 9a. Since it is not possible to secure a complete seal with the insertion hole 9c of the phenol resin laminated plate 9 to which is attached, there is a problem that the airtightness is anxious.

The present invention is to solve the problems of the above-mentioned conventional terminal crimping method, and it is possible to secure a complete seal between the rivet and the insertion hole of the phenol resin laminated plate to which the rubber plate is attached,
An object of the present invention is to provide a method for caulking a terminal of an electrolytic capacitor capable of improving airtightness.

In order to achieve the above-mentioned object, the terminal caulking method of the electrolytic capacitor of the present invention has a length below the rivet neck of 10 to 15% of the length of the rivet and a diameter of the rivet having a small diameter. Insert the stepped rivet that forms a large diameter part of 105 to 110% of the shaft diameter of the part into the rivet insertion hole formed in the bent part of the terminal, and And the step of welding the stepped rivet from the rubber plate side into the insertion hole of the phenolic resin laminated plate to which a rubber plate is attached, and at the tip of the stepped rivet that has penetrated, the same inner diameter as the diameter of the large diameter part. The step of inserting the washer, the inner diameter is slightly larger than the shaft diameter of the small diameter portion of the rivet, and the inner diameter of the inner portion is slightly smaller than the shaft diameter of the small diameter portion of the rivet, and presses the tip of the rivet, Of the rivet Diameter with to bite the radial direction to the buckled allowed by the rubber plate, and those comprising a step of forming a head fastened to said washer surface.

E action According to the above method of caulking the terminal of the electrolytic capacitor,
Under the rivet, the length is 10-15% of the length of the rivet,
Insert the stepped rivet that has a large diameter part that is 105 to 110% of the shaft diameter of the small diameter part of the rivet into the rivet insertion hole formed in the bent part of the terminal, and insert the bent part and the rivet Weld the back side of the head, and insert the stepped rivet into the insertion hole of the phenolic resin laminated plate with the rubber plate attached from the rubber plate side, and insert a washer into the tip of the stepped rivet that has penetrated. After that, since the tip of the rivet is pressed by a dedicated press die, first the small diameter part of the rivet buckles to the same diameter as the large diameter part, and then the large diameter part buckles in the radial direction. As a result, the clamping head is formed on the surface of the washer as well as it bites strongly into the rubber plate, whereby the terminal caulked portion is completely sealed. In this case, since concentrated stress due to the notch is applied to the large diameter portion and the small diameter portion, the rivet is easily plastically deformed.

F. Embodiments Embodiments of the terminal caulking method for an electrolytic capacitor according to the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 is an electrolytic capacitor, 2 is a capacitor body, and 3, 4, and 5 are phenol resin laminated plates to which terminals according to the present invention, stepped rivets and rubber plates are attached.

As shown in FIG. 2, the terminal 3 has a thickness of 0.8 mm.
This steel plate is plated, and the base end of this terminal 3 is bent at a right angle to form a bent portion 3a, and a rivet insertion hole 3b is formed in the center of this bent portion 3a. Then
Further, the bent portion 3a is formed narrower from the base end to the tip. The stepped rivet 4 is made of hard aluminum, and the head 4b of the rivet 4 has a diameter of 4.5 m.
m, height 1.1 mm, shaft diameter of small diameter part 4c of rivet is 2.2 mm,
The rivet 4 has a length of 8.5 mm. Under the neck of the rivet 4, a large diameter portion 4a having a diameter of 2.35 mm and a length of 1.15 mm is provided. The length of the large-diameter portion 4a is dimensioned so as not to bite into the phenol resin plate 5b during crimping and damage the phenol resin plate 5b. Further, since the shaft diameter of the small diameter portion 4c of the rivet 4 is smaller than the diameter of the large diameter portion 4a, the material can be saved as compared with the straight rivet.

Then, as shown in FIG. 3, the stepped rivet 4 is inserted into the rivet insertion hole 3b of the terminal 3 to weld two sets of the bent portion 3a of the terminal 3 and the back surface of the head 4b of the rivet 4. .

In addition, the phenolic resin laminated plate 5 attached with a rubber plate is a black rubber plate 5a having a disc shape with a diameter of 23.9 mm and a thickness of 1.0 mm.
And a disc-shaped phenolic resin plate 5b having a diameter of 23.7 mm and a thickness of 1.5 mm are bonded together, and through holes 5c and 5c having a diameter of 2.3 mm are formed on the center line with a span of 8.4 mm. I have set up. The phenol resin plate 5b has an explosion-proof valve hole (not shown) with a diameter of 1.0 mm at the center of both insertion holes 5c and near the periphery.
Is provided.

Furthermore, the diameter is 5.0 mm, the thickness is 0.8 mm, and the diameter of the large diameter portion 4a is 2.
Two washers 6 made of hard aluminum having the same hole diameter as 35 mm are provided.

Next, the two stepped rivets 4 to which the terminal 3 is attached and the phenol resin laminated plate 5 to which the rubber plate 5a is attached
The fixing method of and will be described. First, as shown in FIG. 3, the stepped rivet 4 is inserted into the insertion holes 5c, 5c of the phenol resin laminated plate 5 attached to the rubber plate 5a from the rubber plate 5a side. At this time, the large diameter portion 4a of the stepped rivet 4
Is the rivet insertion hole 3b of the terminal 3 and the black rubber plate 5a.
Of the stepped rivet 4 and the insertion hole 5c of the phenol resin plate 5b, a gap s is formed between the small diameter part 4c of the stepped rivet 4 and the insertion hole 5c.

Then, the washers 6, 6 are fitted into the tips of the stepped rivets 4 which penetrate the insertion holes 5c, 5c.

Next, as shown in FIG. 4, the inner diameter is slightly larger than the shaft diameter of the small diameter portion 4c of the stepped rivet 4, and the inner diameter of the inner portion thereof is slightly smaller than the shaft diameter of the small diameter portion 4c of the rivet 4. When the tip of the small diameter portion 4c of the stepped rivet 4 is pressed by the taper-shaped pressing die 7 and the lower die 7a provided on the opposite side, first, the shaft diameter of the small diameter portion 4c of the stepped rivet 4 becomes the large diameter portion. Buckling up to the same diameter as 4a, the gap s shown in Fig. 3
Is filled in and closely contacted with the insertion hole 5c of the phenol resin plate 5b.
Then, the large diameter portion 4a buckles in the radial direction and the black rubber plate
While firmly biting into the rubber of 5a, a tightening head 4d of the stepped rivet 4 is formed on the surface of the washer 6, whereby the terminal 3 is caulked to the phenol resin laminated plate 5 to which the rubber plate 5a is attached.

When the terminal 3 is caulked in the above process procedure, there is no possibility that the small diameter portion 4c and the large diameter portion 4a of the stepped rivet 4 will bite into the phenol resin plate 5b to cause cracking, and also the large diameter portion. 4a is buckled and black rubber plate 5a
It only bites deeply into the inside, and in this case, the biting amount exceeds the volume increase of the stepped rivet 4 with the large diameter portion 4a added, and therefore such a reliable and stable caulking is possible. The processing completely seals the insertion hole 5c of the phenol resin laminated plate 5 to which the rubber plate 5a is attached, so that the electrolytic solution in the capacitor body 2 does not leak.

The large diameter portion 4a of the stepped rivet 4 in the above embodiment
The dimensions are only examples and can be appropriately changed within the scope of the claims, and other dimensions and shapes can be appropriately changed depending on the type of the electrolytic capacitor.

EFFECTS OF THE INVENTION As is apparent from the description of the above embodiments, the method of caulking the terminal of the electrolytic capacitor according to the present invention involves buckling a stepped rivet having a large diameter portion under the neck of the rivet, and then buckling the large diameter. Since the part is made to bite only into the rubber of the phenol resin laminated plate to which the rubber plate is attached, it is possible to prevent cracks and other damage to the phenol resin plate, and the amount of biting into the rubber of the large diameter part. Becomes larger, and as a result,
Since the insertion hole of the phenolic resin laminated plate to which the rubber plate is attached is completely sealed, its airtightness can be improved, and such reliable and stable caulking processing significantly improves the quality of the electrolytic capacitor. It can be done.

[Brief description of drawings]

FIG. 1 is a perspective view of an electrolytic capacitor manufactured by a terminal crimping method according to the present invention, FIG. 2 is an exploded perspective view of parts relating to the terminal crimping method, and FIG. 3 is a sectional view of a terminal welded with step rivets, FIG. 4 is an explanatory view of a crimping state by the terminal crimping method according to the present invention, FIG. 5 is an exploded perspective view of parts related to the conventional terminal crimping method, and FIG. 6 is an explanatory view of the crimping state by the conventional terminal crimping method. is there. 1 ... Electrolytic capacitor, 2 ... Capacitor body, 3 ...
Terminal, 3a …… Bending part, 3b …… Rivet insertion hole, 4
...... Stepped rivet, 4a …… Large diameter part, 4b …… Head, 4c…
… Small diameter part, 4d …… Tightening head, 5 …… Phenolic resin laminated plate with rubber plate attached, 5a …… Rubber plate, 5b …… Phenolic resin plate, 5c …… Insertion hole, 6 …… Washer, 7 …… Stamping die.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Nishiki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Within the lead wire industry

Claims (1)

[Claims] 1. A length below the neck of the rivet is 10 to 15% of the length of the rivet, and a diameter is 105 to 110 of the shaft diameter of the small diameter portion of the rivet.
%, A stepped rivet having a large diameter portion is inserted into a rivet insertion hole formed in the bent portion of the terminal, and the bent portion and the back surface of the head of the rivet are welded; Inserting a washer having the same inner diameter as the diameter of the large diameter portion at the tip of the stepped rivet that is inserted through the insertion hole of the phenol resin laminated plate to which the rubber plate is attached with the attached rivet, The inner diameter is slightly larger than the shaft diameter of the small diameter part of the rivet, and the inner diameter of the inner part is slightly smaller than the shaft diameter of the small diameter part of the rivet, by pressing the tip of the rivet shaft, the large diameter part of the rivet is While buckling in the radial direction so as to bite into the rubber plate,
A step of forming a tightening head on the washer surface.