JPH06204095A - Method for fastening external material - Google Patents

Abstract

PURPOSE:To provide a method for fastening an external terminal to a sealing plate whereby the sealing plate is prevented from damaging by a local load. CONSTITUTION:A method for fastening an external terminal by a terminal rivet 12 and a fastening washer 14 to a sealing member 6 which joints a hard insulation plate 2 to an elastic insulation plate 4, whereby the sealing member 6 is so pressed with a local load not to be applied to it when it is clamped by the fastening washer 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing an external terminal to a sealing member formed by joining a hard insulating plate and an elastic insulating plate used for sealing an electrolytic capacitor or the like.

[0002]

2. Description of the Related Art Conventionally, in the case of sealing an outer case for enclosing a capacitor element in an electrolytic capacitor, as shown in FIG. 3, a sealing member is formed by joining an elastic insulating plate 4 such as rubber to a hard insulating plate 2 as a sealing member. A plate 6 is used. And
An external terminal 8 on the anode side or the cathode side is used, and each external terminal 8 has a pair of through holes 10 formed in the sealing plate 6 through which the terminal rivet 12 penetrates to form a ring-shaped fixed washer 14.
To the terminal rivet 12 for discharging the hard insulating plate 2 side,
By tightening it, the terminal rivet 1 is attached to the sealing plate 6.
The external terminal 8 is fixed by using 2 and the fixed washer 14. In this fixing process, electrical connection with the tab pulled out from the capacitor element, that is, the terminal rivet 12 is performed.
This is a process for the sealing plate 6 performed as a pre-process before connection by crimping.

To fix the external terminal 8 to the sealing plate 6, a processing device as shown in FIG. 4 is used. According to this processing apparatus, the sealing plate 6 is installed on the upper surface of the lower mold 18 in which the concave portion 16 that encloses the discharge portion of the sealing plate 6 is formed with the external terminal 8 and the terminal rivet 12 attached. The fixed washer 14 which is projected to the upper surface of the sealing plate 6, that is, the upper surface side of the hard insulating plate 2 is fitted, and the movable die, that is, the upper die 20 is lowered toward the lower die 18 from above,
A load capable of caulking the upper mold 20 in the direction indicated by arrow F is applied to the lower mold 18 in the fixed state. As a matter of course, the upper die 20 is formed with a through hole 22 for allowing the terminal rivet 12 to pass therethrough, and the lower surface side thereof has a protrusion 24 having a triangular cross section for caulking the fixing washer 14. Are formed. Therefore, such an upper mold 2
When 0 is pressed by the terminal portion, the fixed washer 14 is crimped and the external terminal 8 can be fixed to the sealing plate 6 by the terminal rivet 12 and the fixed washer 14.

[0004]

However, since the upper die 20 is locally caulked, that is, only the fixed washer 14 is caulked, the terminal rivet 12 of the sealing plate 6 is fixed as shown in FIG. The load is intensively applied to the portion to be closed, and the elastic insulating plate 4 of the sealing plate 6 is sunk by the elasticity, so that the hard insulating plate 2 is deformed more than necessary.
As a result, cracks 15 are generated in the. The sealing plate 6 having such cracks cannot be used for an electrolytic capacitor that requires airtightness.

Therefore, it is an object of the present invention to provide a method for fixing an external terminal which prevents damage to the sealing member due to local load.

[0006]

As shown in FIG. 1, a method for fixing an external terminal according to the present invention is a sealing member (sealing member) that joins a hard insulating plate (2) and an elastic insulating plate (4). Board 6)
A method for fixing an external terminal, comprising fixing a terminal rivet (12) and a fixing washer (14) to an external terminal (8), wherein the sealing member is pressed to locally attach to the sealing member when the fixing washer is caulked. The feature is that the load is not applied.

[0007]

[Operation] With this fixing method, when crimping the fixed washer,
By pressing the sealing member, the load due to caulking is prevented from locally acting on the sealing member, so that the deformation of the hard insulating plate in the sealing member is suppressed and the sealing member can be protected from the damage.

[0008]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

FIG. 1 shows an embodiment of a method of fixing an external terminal according to the present invention. The same parts as those of the processing apparatus shown in FIG. 4 are designated by the same reference numerals. In this fixing device, the upper die 20 as the first pressurizing die is provided with the upper die 26 as the second pressurizing die so as to surround the peripheral portion. The upper mold 26 has a pressure area on the upper surface of the sealing plate 6 surrounding the pressure part of the upper mold 20. The pressurizing timing of the upper die 26 is synchronized with the upper die 20.

Therefore, when the upper die 20 is lowered with respect to the fixed washer 14 and a load is applied in the direction indicated by the arrow F, if a load is also applied to the upper die 26 as indicated by the arrow G, the fixed washer 14 As a result of simultaneously pressing the sealing plate 6 at the same time, the deformation of the sealing plate 6, particularly the deformation of the hard insulating plate 2 can be reliably prevented. As a result, the hard insulating plate 2 is protected from damage such as cracks when the fixed washer 14 is caulked.

Next, FIG. 2 shows a processing apparatus suitable for carrying out the external terminal fixing method of the present invention. In this processing apparatus, an upper die 20 is installed on a base 28, and the form of the upper surface thereof is the same as that of the upper die 20 shown in FIG.

An upper die 26, which is an annular body that penetrates the upper die 20, is installed, and the upper die 26 is attached to a support frame 30. The support frame 30 is a pair of support rods 31.
It is slidably attached to the fixed support portion 32 via. That is, the spring 34 is inserted around the support rod 31, and the fixed support portion 32 is attached to the support rod 31 via the bushing 36 which is a slide support means. Then, the fixed support portion 32 is connected to the press machine 38.
It is firmly fixed to the pressurizing section 40 side with a bolt 42.

If such a processing apparatus is used, the pressure unit 4
When 0 is lowered, first, the upper mold 26 comes into contact with the hard insulating plate 2 side of the sealing plate 22 and stands still, and when the pressing portion 40 is further lowered in that state, the upper mold 20 passes through the upper mold 26 and descends. Then, the fixed washer 14 is swaged. At this time, a load acts on the fixed washer 14 for caulking, but at the same time, since a load is applied to the entire sealing plate 6 by the upper mold 26, a local load action is prevented and the hard insulating plate is prevented. It is possible to protect the sealing plate 6 from damage due to excessive deformation without deforming more than necessary.

[0014]

As described above, according to the present invention,
When processing the fixed washer, it is possible to suppress the local load on the sealing plate, protect the sealing plate from damage such as cracking, and securely fix the external terminal to the sealing plate.
It can contribute to the production of a highly reliable electrolytic capacitor.

[Brief description of drawings]

FIG. 1 shows an embodiment of a method of fixing an external terminal according to the present invention.

FIG. 2 is a partial cross-sectional view showing a specific example of a processing apparatus used for carrying out the method for fixing external terminals shown in FIG.

FIG. 3 is an exploded perspective view showing a structure for fixing an external terminal to a sealing plate.

FIG. 4 is a cross-sectional view showing a conventional method of fixing an external terminal to a sealing plate.

FIG. 5 is a cross-sectional view showing deformation and crack generation of a sealing plate by a conventional fixing method.

[Explanation of symbols]

 2 Hard insulating plate 4 Elastic insulating plate 6 Sealing plate (sealing member) 8 External terminal 12 Terminal rivet 14 Fixing washer

Claims (1)

[Claims] 1. A method of fixing an external terminal, comprising fixing a terminal rivet and a fixing washer to an external terminal on a sealing member joining a hard insulating plate and an elastic insulating plate, wherein the fixing washer is caulked. A method for fixing an external terminal, comprising pressing a sealing member so that a load is not locally applied to the sealing member.