JPH0590084A - Method of jointing externally drawn out lead wire for aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To provide a method for jointing an externally drawn out lead wire for an aluminum capacitor without causing insufficient push-in or deformation at the rod part of an aluminum wire. CONSTITUTION:This is equipped with an aluminum wire 11, which has a flat part 11a and a rod part 11b, and an externally drawn-out lead 12 being pushed in and jointed with the rod part 11b of this aluminum wire 11, and the externally drawn-out lead wire 12 is jointed with the rod 11b of the aluminum wire 11 by forming a recess 15 at the cut end face of the rod 11b of the aluminum wire 11 and pushing in the externally drawn-out lead wire 12 into the rod 11b of the aluminum wire 11 being heated in half fused condition, along this recess 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining an external lead wire for an aluminum electrolytic capacitor used in an aluminum electrolytic capacitor which is an electronic component.

[0002]

2. Description of the Related Art As a conventional method for joining external lead wires for an aluminum electrolytic capacitor of this type, Japanese Patent Publication No.
The one disclosed in Japanese Patent No. 41145/1992 is known.
That is, as shown in FIG. 4, this is an aluminum wire 1 having a flat portion 1a and a round bar portion 1b, and a copper-base tinned iron wire () which is joined by being pressed into the inside of the round bar portion 1b of the aluminum wire 1 ( An external lead wire 2 made of CP wire),
The round bar portion 1b of the aluminum wire 1 is heated to a semi-molten state while maintaining its shape by a burner 3 which burns a mixed gas of oxygen, hydrogen and methyl alcohol, and the round bar portion 1b of the aluminum wire 1 is heated. The externally drawn lead wire 2 having a wedge-shaped tip was pushed into the center to bond the both 1 and 2.

[0003]

However, in the method of joining the external lead wires as shown in FIG. 4 described above, when the round bar portion 1b of the aluminum wire 1 is cut into a predetermined size, as shown in FIG. In addition, since the cutting is performed by vertically moving the two cutting blades 4, 4a that move up and down toward the center of the round bar portion 1b of the aluminum wire 1, the cutting blades 4, 4a The convex portion 5 (parting line) is left at the center of the round bar portion 1b of the aluminum wire 1 which is in contact with each other, and as a result, the round bar portion 1b of the aluminum wire 1 cut in such a state. Is heated to a semi-molten state while maintaining its shape by a burner 3 which burns a mixed gas of oxygen, hydrogen and methyl alcohol as shown in FIG. 3, and at the center of the round bar portion 1b of the aluminum wire 1, Wedge-shaped tip Forms an external pull-out lead wire 2
When the is pushed in, the pushing position of the external lead wire 2 varies due to the convex portion 5, which causes the pushing defect and the round bar portion 1b of the aluminum wire 1 to cause the irregular shape defect 6.

The present invention solves such a conventional problem, and provides a method for joining an external lead wire for an aluminum electrolytic capacitor which does not cause a push-in failure or a defective shape of a round bar of an aluminum wire. The purpose is to do.

[0005]

In order to achieve the above object, a method for joining external lead wires for an aluminum electrolytic capacitor according to the present invention comprises: an aluminum wire having a flat portion and a round bar portion;
An external lead wire that is pressed into the inside of the round bar of the aluminum wire to be joined is formed, and a recess is formed in advance on the cut end surface of the round bar of the aluminum wire, and along the recess, semi-melting is performed. The externally drawn lead wire is joined to the rounded bar portion of the aluminum wire by pushing the externally drawn lead wire into the round bar portion of the aluminum wire that has been heated to a state.

[0006]

According to the above-described joining method of the present invention, a concave portion is formed in advance on the cut end surface of the round bar portion of the aluminum wire having the flat portion and the round rod portion, and along the concave portion, a semi-molten state is obtained. Since the external lead wire is pushed into the round bar portion of the heated aluminum wire, the concave portion has a function of determining the pushing position of the external lead wire, thereby pushing the external lead wire. It is possible to eliminate problems such as improper pushing due to variations in pushing position that occur instantaneously and irregular shape defects of the round bar portion of the aluminum wire.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2, 11 is an aluminum wire, and this aluminum wire 11 has a flat portion 11a and a round bar portion 11b connected to the electrode foil for an aluminum electrolytic capacitor, and the round bar in the aluminum wire 11 is In part 11b,
The externally drawn lead wire 12 made of a copper-undercoated tinned iron wire (CP wire) is joined. In this joining, first,
As shown in, the tip end portion 13a of the processing shaft 13 is brought into contact with the center of the cut end surface of the round bar portion 11b of the aluminum wire 11 and is pushed in a small amount, so that the convex portion 14 remaining at the time of cutting is formed.
To form a wedge-shaped recess 15 so that the tip wedge-shaped portion of the external lead wire 12 is guided to the recess 15, and the round bar portion 11b of the aluminum wire 11 is guided.
Is heated to a semi-molten state while maintaining its shape by a burner (not shown) that burns a mixed gas of oxygen, hydrogen and methyl alcohol, and in this state, the tip wedge-shaped portion of the external lead wire 12 is The aluminum wire 11 and the external lead wire 12 are joined by pushing along the recess 15 into the center of the round bar portion 11b of the aluminum wire 11.

As described above, in the embodiment of the present invention, the aluminum wire 11 having the flat portion 11a and the round bar portion 11b.
By forming a recess 15 in advance on the cut end surface of the round bar portion 11b in the above, and by pushing the external lead wire 12 along the recess 15 into the round bar portion 11b of the aluminum wire 11 heated to a semi-molten state. Since the aluminum wire 11 and the external lead wire 12 are joined to each other, the concave portion 15 has a function of determining the pushing position of the external lead wire 12, and thus the convex portion 14 remaining at the time of cutting. External lead wire 1 due to influence of
Since it is possible to eliminate the variation in the pushing position that occurs at the moment of pushing in 2, it is possible to prevent the pushing failure and the aluminum wire 11.
It is possible to eliminate a defective appearance such as a defective shape of the round bar portion 11b.

Table 1 shows experimental data comparing the effects of the present invention product and the conventional product in terms of poor appearance.

[0010]

[Table 1]

In the embodiment of the present invention, the recess 1
The shape of the external lead wire 12a has been described as the wedge shape of the external lead wire 12 in conformity with the tip wedge-shaped portion of the external lead wire 12, as shown in FIG.
When the tip shape of the above is a conical shape, the shape of the concave portion 15a may be the same shape or an approximate shape in accordance therewith.

[0012]

As described above, according to the method of joining the external lead wire for the aluminum electrolytic capacitor of the present invention, the concave portion is formed in advance on the cut end face of the round bar portion of the aluminum wire having the flat portion and the round bar portion. Moreover, since the external lead wire is pushed along the concave portion into the round bar portion of the aluminum wire heated to the semi-molten state, the concave portion serves to determine the pushing position of the external lead wire. As a result, it is possible to eliminate problems such as a defective pushing due to a variation in the pushing position at the moment of pushing the external lead wire and a defective shape of the round bar portion of the aluminum wire.

[Brief description of drawings]

FIG. 1 is a process sectional view of a method for joining an external lead wire for an aluminum electrolytic capacitor showing an embodiment of the present invention.

FIG. 2 is a perspective view of an external lead wire and an aluminum wire in the joining method.

FIG. 3 is a perspective view of an external lead wire and an aluminum wire in a joining method according to another embodiment of the present invention.

FIG. 4 is a process perspective view of a method for joining external lead wires for an aluminum electrolytic capacitor showing a conventional example.

FIG. 5 is a process sectional view of the joining method.

[Explanation of symbols]

 11 Aluminum wire 11a Flat portion 11b Round bar portion 12, 12a External lead wire 15, 15a Recess

Continuation of the front page (72) Inventor Takashi Aoki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A cut end surface of the round bar portion of the aluminum wire, comprising an aluminum wire having a flat portion and a round bar portion, and an external lead wire which is pressed into the inside of the round bar portion of the aluminum wire to be joined. The external lead wire is pushed into the round bar of the aluminum wire that has been heated to a semi-molten state by forming a recess in advance on the round bar of the aluminum wire. A method for joining an external lead wire for an aluminum electrolytic capacitor, which is characterized in that