JPS5831250B2 - Setsugobuoyuusurukinzokuhakuoyobisonoseizouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a metal foil (such as an aluminum foil or a copper foil) having a joint portion and a method for manufacturing the same.

Conventionally, welding using ultrasonic waves or adhesion using adhesive tape has been known as a means of joining metal foils together, and when annealed metal foils such as soft aluminum foils are bonded together, knurling or filing is used. It is also known that bonding can be easily achieved by direct pressure bonding.

Although the bonding method by deformation crimping of foils has the advantage of being easy to implement, it is suitable for soft foils, but cannot be bonded with hard foils because the deformation crimping of the foils is insufficient.

Although it is possible to join even hard foils by welding using ultrasonic waves, it requires appropriate equipment, the product is expensive, and there are problems such as unevenness in equipment adjustment and work surfaces. be.

Those bonded with adhesive tape or the like cannot be subjected to high-temperature heat treatment, and there are problems such as a slight loss of electrical conductivity.

On the other hand, in the manufacturing process of metal foils such as aluminum foil, when rolled into a foil, it becomes hard due to work hardening, and if the foil is cut in this state due to an accident, etc.
Or, when adding pieces to obtain the required length, it becomes necessary to join the foil in a rigid state.

As described above, the need to bond hard foils together often arises in the manufacturing process, but conventional bonding means have many problems.

Therefore, the present invention provides a metal foil having a joint portion that can be manufactured by a simple joining method that does not affect the performance of the foil, without relying on conventionally known welding or bonding methods, and a method for manufacturing the same. A description will be given below based on drawings showing an example thereof.

In the figure, reference numerals 1 and 2 are hard metal foils, such as hard aluminum foils, which are polymerized with a soft metal foil piece 3, such as a soft aluminum foil piece, interposed at the joint end, and the overlapping portion is placed on a hard roll 4. Place the knurling 5 on the surface of the upper metal foil 1 while pressing it and run the roll 4 to make a number of fine pressing marks (so-called serrations) 6 reaching the lower metal foil 2, and the pressing marks 6. The three parts 1, 2, and 3 are joined together by the engagement of the minute concavo-convex portions.

As mentioned above, it is not possible to join the hard metal foils by directly pressing them together with a knurling, but by interposing the hard metal foil piece 3, it is possible to integrally join the three parts 1, 2, and 3. It is.

In addition, if this is used as a file plate instead of the roll 4 shown in the figure, and if this is used as a rotating body with a smooth surface instead of the knurling 5, fine pressing traces reaching from the lower aluminum foil 2 to the upper aluminum foil 1 will be created in the same way as described above. You can add 6.

Alternatively, a file plate may be used on the lower part and the upper part may be pressed with a knurl 5 to form pressing marks 6 from both the upper and lower surfaces.

When the tensile strength of the metal foil bonded as described above was tested on aluminum foil, it showed a value 90 to 100 times higher than the tensile strength of the aluminum foil without the bonded part, and the tensile strength of the aluminum foil without the bonded part was It was confirmed that the strength was comparable.

Ordinary metal foils are joined as described above and then subjected to an annealing process before being put to general use in a softened state.The tensile strength of aluminum foils in that state was tested and is shown in column A of Table 1. ), conventional bonding in which softened aluminum foil is directly knurled (
(shown in column B of Table 1) are compared as follows.

In the table at the top, in column A, for example, "7μ (hard) - 6μ (
"Soft) - 7μ (Hard)" indicates that a piece of soft aluminum foil 3 with a thickness of 6μ is placed between hard aluminum foils 1 and 2 with a thickness of 7μ.
2 shows an embodiment of an aluminum foil which is joined by the method of the present invention with a material interposed therebetween and then annealed and softened.

For example, the display "7μ (soft) - 7μ (soft)" in column B indicates an embodiment in which two sheets of soft aluminum foil having a thickness of 7μ are joined.

The above test was conducted using a Schopper type tensile tester (loads 1 to 3).
kg), the gauge length was 100 mm, and the test piece width was 15 mm.

According to the above test results, it can be seen that the metal foil in which the joint is formed by the method of the present invention and then annealed has almost the same tensile strength as the metal foil knurled by the conventional method.

As described above, the present invention makes it possible to join hard metal foils, which was conventionally considered impossible to join by pressure bonding using knurls or files, by interposing the soft metal foil pieces 3. The manufacturing method also requires no special equipment and has good workability compared to conventional methods of joining by welding.

Furthermore, compared to bonding means using adhesive tape or the like, the effects of the present invention are extremely remarkable, such as not intervening foreign matter, so that electrical conductivity is not impaired, and heat treatment after bonding is possible.

[Brief explanation of the drawing]

FIG. 1 is a side view of the manufacturing process, and FIG. 2 is an enlarged cross-sectional view of the joint portion of the metal foil of the present invention. 1.2... Hard metal foil, 3... Soft metal foil piece, roll, 5... Knurling, 6... Pressing trace. 4...

Claims (1)

[Scope of Claims] 1. A piece of soft metal foil is interposed between the ends of the hard metal foils so that the ends are overlapped, and one hard metal foil is connected to the other hard metal foil through the soft metal foil piece at the overlapping part. A metal foil having a joint characterized by forming fine pressing marks that reach the metal foil. 2. After interposing a piece of soft metal foil between the ends of the hard metal foils and polymerizing the ends, the overlapping part is pressed between suppressors having a split on at least one side, and one side is applied to the overlapping part. A method for producing a metal foil having a joint, the method comprising forming fine pressing marks from one hard metal foil to another hard metal foil through a soft metal foil piece.