JPH0439220B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a capacitor electrode terminal that also serves as an electrode lead used in an electrolytic capacitor, a paper capacitor, or the like.

[Conventional technology]

Generally, it is known that electrode terminals connected to capacitor elements used in electrolytic capacitors are made by welding thin lead wires (CP wires) to linear aluminum tabs.

[Problem that the invention seeks to solve]

However, in this conventional method, one flat electrode part is processed on one tab and the lead wire is welded to produce one capacitor electrode terminal, which is extremely inefficient and requires welding. Not only do various shapes of the parts lead to poor welding, but also lead wire bends and eccentricity lead to poor quality connections, and lead wire cut burrs often do not meet standards, and welded electrode terminals In order to make a specified product, the electrode terminals must be rearranged and supplied for molding, and post-processing such as dimensional inspection must be performed, which is extremely complicated and poses problems in production management. There is a risk that lead wires may be broken or contact failure may occur due to poor strength of the parts, and there are drawbacks such as the necessity of destructively inspecting the entirety for quality assurance, which further complicates the process.

The present invention is intended to appropriately eliminate these conventional drawbacks, by simplifying and facilitating the integral connection of the lead part and the electrode part, and by making it possible to form the electrode terminal and maintain dimensional accuracy appropriately. The object of the present invention is to provide a simple, inexpensive, mass-produced manufacturing method for electrode terminals for capacitors, which can significantly improve quality control and improve productivity by automatically excluding non-defective products.

[Means for solving problems]

In the present invention, a cap-shaped contact member made of an electrically conductive material is fitted onto both ends of an aluminum wire having a circular cross section, and the aluminum wire portion between the two contact members is pressed into a plate shape. After forming a flat part, remove unnecessary parts around the flat part, and cut and separate the center of the flat part at a bisecting line to form a flat electrode part to be connected to the capacitor element. This method of manufacturing capacitor electrode terminals is characterized in that each electrode terminal product has a contact member.

[Effect]

In the manufacturing method of the present invention, a flat electrode part that is connected to a capacitor element using an aluminum wire having a circular cross section, and a cylindrical part that becomes an electrode lead integrally continuous with the flat electrode part are formed by pressing and cutting. By this method, two capacitor electrode terminals can be manufactured at the same time, thereby greatly increasing productivity and easily reducing processing costs.

〔Example〕

An embodiment of the present invention will be described with reference to the examples shown in FIGS. 1 to 6. At both ends 1 ₁ and 1 ₁ of an aluminum wire 1 having a circular cross section, cap-shaped contact members 2 and 2 made of a conductive material are respectively attached. After fitting and welding or caulking and fixing, and positioning the center of the members, both contact members 2, 2
A pair of semicircular or V-grooved guides (not shown) is used to squeeze and hold two positions close to the contact member 2 between the contact members 2, and the aluminum wire portion between both the contact members 2 is connected to the plate. Roll it with a punch 5 to form a flat part 3.
After forming, when the punch 5 is gripping the material, the contact members 2, 2, which will become one end or both sides of the material, are gripped by the holder and moved to the next step, and the flat part is moved to the next step while the punch 5 is gripping the material. The unnecessary part 4 around the periphery of the flat part 3 is cut off along the cutting lines C ₁ and C ₁ , and the material is further moved to the next process while being gripped, and the center of the flat part 3 is cut along the bisecting line C to separate it. A flat electrode part 6 connected to a capacitor element is formed to form an electrode terminal product 7 each having a contact member.

In this case, as long as there is no misalignment of the chuck gripping the material, there will be no deviation in the longitudinal dimension of the flat part 3, and the length of the flat part 3 is determined by the length of the punch 5. Dimensions are made uniform without variation.

Further, a tapered part 13 is formed between the flat electrode part 6 and the cylindrical part ₁₂ which is the electrode lead with the contact member ₂ , and the flat part 3 and a part of equal thickness are cut into a rectangle to form a flat electrode. The contact member 2 is used as a bottomed tubular body, and the aluminum wire 1 is stretched into a cylindrical part ₁₂ with a diameter that can fit therein, and then cut to a predetermined length. It is preferable that the cut end surfaces are fixed to the inner bottom surface of the bottomed tubular body while being in contact with each other.

The flat part 3 is rolled to a predetermined thickness to have an area equal to or larger than that for forming the flat electrode part 6, and the flat part 3 has a pair of widths along the outer periphery of the cylindrical part. Even if the flat electrode part 6 is formed by a cutting process in which both side lines and a center line perpendicular to these lines are cut simultaneously or separately, in the case of press forming, where unnecessary parts are not created, only the bisecting line is cut. All you have to do is cut it with . Furthermore, the pressing process may be performed before fixing the contact member 2,
For example, the aluminum wire 1 has the same cylindrical portion 1 ₂ at both ends,
After forming the flat part 3 in the center leaving 1 ₂ ,
It is also possible to fit the contact members 2, 2 in the form of bottomed tubular bodies onto both ends 1 ₁ , 1 ₁ and fix and connect them by welding or caulking.

And, in the electrode terminal product 7,
The flat electrode part 6 may be a capacitor element 10, for example, a capacitor element in which a separator paper, a spacer, or other separator is inserted between an anode electrode foil and a cathode electrode foil and wound, a sandwich structure,
It is used by being connected to another electrolytic capacitor element configured to match the required capacitor capacity, and is inserted into the capacitor element 10 in the case 11 as shown in FIG. After sealing, one end of the cylindrical part ₁₂ of the electrode lead, which becomes an anode and a cathode, is led out from the sealing body 12, and the contact members 2, 2 are exposed and soldered to a board, for example, a printed wiring board 13, to be effectively used. It is used.

〔Effect of the invention〕

In the present invention, a cap-shaped contact member made of a current-carrying material is fitted onto both ends of an aluminum wire having a circular cross section, and the aluminum wire portion between the contact members is fixedly connected by welding or caulking. After forming a flat part by pressing, unnecessary parts around the periphery of the flat part are cut off, and the center of the flat part is cut and separated by a bisecting line to form a flat electrode part to be connected to a capacitor element. By forming electrode terminal products each having a contact member, products can be made in pairs at once, greatly improving productivity and significantly reducing costs compared to conventional methods. , it is possible to reduce the cut allowance at the center when dividing into two parts after press molding, reduce material loss and processing loss through molding, reduce material costs, and reduce press molding costs by half. There is no quality deterioration due to assembly defects, and there are no restrictions on the material of the electrode terminal part, so characteristics can be changed freely.The processing time is significantly simplified, making it suitable for mass production, and the product is uniform and has a good finish. This has the effect of improving quality stability, reducing manufacturing losses, simplifying handling, significantly increasing productivity, and making it possible to manufacture at low cost and economically.

[Brief explanation of drawings]

The drawings show the processing steps of the method of the present invention; FIG. 1 is a side view of the material before assembly, FIG. 2 is a side view of the pressing process, FIG. 3 is a partially cutaway side view after fixing the cap, and FIG. 4 is a side view of the material before assembly. 5 is a plan view of the product in a separated state after the cutting step, FIG. 6 is an oblique view of the product, and FIG. 7 is a longitudinal sectional view of the product in use. 1... Aluminum wire, 1 ₁ ... End, 1 ₂ ...
Cylindrical part, 1 ₃ ... Tapered part, 2 ... Contact member,
3... Flat part, 4... Unnecessary part, 5... Punch,
6... Flat electrode part, 7... Electrode terminal product, 10...
...Capacitor element, C, C ₁ ...Cut wire.

Claims (1)

[Scope of Claims] 1. A cap-shaped contact member made of an electrically conductive material is fitted to each end of an aluminum wire having a circular cross section, and the aluminum wire portion between the two contact members is fixedly connected by welding or caulking. After pressing into a plate shape to form a flat part, unnecessary parts around the periphery of the flat part are cut off, and the center of the flat part is cut and separated by a bisecting line, and the flat part is connected to the capacitor element. 1. A method for manufacturing a capacitor electrode terminal, which comprises forming an electrode portion and producing an electrode terminal product each having a contact member. 2 A patent claim in which the gap between the flat electrode part and the cylindrical part serving as the electrode lead with the contact member is formed into a tapered part, and the flat part is cut into a rectangular shape with a uniform thickness to form the flat electrode part. A method for manufacturing a capacitor electrode terminal according to item 1. 3. The contact member is used as a bottomed tubular body, and both end surfaces of the aluminum wire having a diameter that can be fitted therein are fixed to the inner bottom surface of the bottomed tubular body while being in contact with each other. Or the method for manufacturing a capacitor electrode terminal according to item 2. 4. A flat electrode part is formed by a cutting process in which the flat part is cut by a pair of side lines extending along the outer periphery of the cylindrical part and a center line perpendicular to the width lines. The method described in any one of items 1 to 3.