JPS6411393B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for connecting metal strips, and in particular, when one or both sides of a metal strip is plated entirely, striped, or spot-plated, the process is continuous. The present invention relates to a method for connecting metal strips that is applied when connecting metal strips.

[Prior Art] When performing full-surface plating, stripe plating or spot plating on one or both sides of a metal strip, both ends of the metal strip are connected in order to perform the plating operation continuously. the current,
The connection method used in such cases is to overlap the ends of the metal strips one above the other, and spot weld the overlapping portions from both the top and bottom surfaces.

However, with this connection method of overlapping and spot welding, if the thickness of the metal strip is very thin, the absolute value of the thickness of the overlapping part will not be that large, and there is no particular problem (on-site connection). However, depending on the purpose of use and customer requests, the thickness of the metal strip is not necessarily thin or thick. When the thickness becomes thicker, the thickness of the overlapping part (connection part) increases locally in the above connection method. It is used to remove unnecessary masking tape (masking tape corresponding to the required part of the strip) by making incisions in the masking tape pasted on the strip. The cutting edge of the cutter is easily damaged by the step at the connection part, and the movement mechanism of the application roll for pasting masking tape onto the strip can be damaged by the passage of the connection part. . Furthermore, for metal strips, when the connection part passes through the guide rolls,
Meandering tends to occur due to lack of bending stress compliance (flexibility) of the connection part, and once the
When meandering occurs, it takes time to return to stable running, resulting in a problem of poor product yield.

One possible solution to this problem is to butt connect both ends of the metal strip using a butt welder, but the welder itself is very expensive, and moreover, a butt welding line is generally made up of multiple lines running simultaneously. If welding machines were to be installed on all lines in order to achieve this, the product cost would rise.

[Problems to be Solved by the Invention] The purpose of the present invention is to eliminate the drawbacks of the prior art as described above, to connect metal strips in a short time using an inexpensive device, and to create a new method that can connect metal strips at high yield and at low cost. The goal is to provide a method.

[Means for Solving the Problems] The gist of the present invention is that both ends of metal strips to be connected to each other are butted against each other, but are not brought into close contact with each other, but with a gap between them, and solder for adhesion is applied in advance. A thin metal foil partially having on one side and having a thickness of 1/10 to 3/10 of the metal strip is prepared as an adhesive reinforcing tape, and the adhesive reinforcing tape is provided on both sides of the metal strip. The method of connecting metal strips includes heating, pressing, and soldering a tape across both ends of each metal strip.

[Example] Fig. 1 shows a connection part formed by a connection method according to an embodiment of the present invention, in which the end face 3 of one tip 2 of metal strips 1, 1 to be connected to each other and the rear end of the other An adhesive made of a thin metal foil, which is arranged so that the end surface 5 of the end portion 4 is butted with some gap, and has adhesive solder (including brazing material) 6 partially on one surface as shown in FIG. Reinforcing tapes 7 are arranged on the upper and lower surfaces of the metal strips 1, 1, respectively, and these adhesive reinforcing tapes 7 are heated, pressed, and soldered across both ends of the metal strips 1, 1.

A slight gap is provided between the end faces 3 and 5 of the metal strips 1, 1, and this gap also provides flexibility to the connecting portion of the metal strips 1, 1. Flexibility is necessary in the sense that it can easily follow bending stress when the connection part passes through guide rolls or masking tape application rolls (in the case of manufacturing strips), or when changing direction at that time. It is a nature.

For reasons of workability and reasons to be described later, the adhesive reinforcing tape 7 used has adhesive solder 6 partially applied on one surface of the adhesive reinforcing tape 7 in advance. In addition, the adhesive reinforcing tape 7 is formed of a metal foil tape that has strength enough to withstand stress such as the winding force of the metal strip during work, but when the tape passes through the roll of the strip connecting portion described above, In order to avoid obstacles that may occur in
The thinnest tape material should be applied to the minimum necessary.
The thickness of the adhesive reinforcing tape required to connect 0.5m/m thick plating strips is 0.05m/m ~
It has been found through experiments that approximately 0.15 m/m is sufficient for application. In the case of this experiment, the thickness of the connection part by conventional overlapping is more than twice the thickness of the strip, whereas the thickness of the connection part according to the present invention is only about 1.15 to 1.35 times the thickness of the strip. The advantages of the connection according to the invention become more pronounced as the thickness of the strip becomes thicker. Please note that it can be used.

Further, the adhesive solder 6 may be provided on the entire surface of the adhesive reinforcing tape 7, but in this case, a part of the adhesive solder 6 overflows from the outer edge of the reinforcing tape 7 during heat-pressing and contaminates the plating liquid. This will cause problems such as. Therefore, in the present invention, the adhesive solder 6 is partially provided on one surface of the reinforcing tape 7. In addition, solder 6 for adhesion
It is also effective for the flexibility of the reinforcing tape 7 if it is provided partially instead of over the entire surface. Reference numeral 9 indicates a portion where there is no adhesive solder 6. Such adhesive solder 6
The arrangement may be as shown in FIG. 3 or 4. In this form, it is possible to more reliably prevent the adhesive solder from overflowing from the outer edge of the reinforcing tape 7. Further, the tape 7 itself becomes more flexible.

Although it is possible to use an organic adhesive other than the adhesive solder 6, when plating is taken into consideration, organic adhesives are not preferred because they contaminate the plating bath.

[Effects of the Invention] According to the connection method of the present invention, even when the metal strip is thick, it does not become thick and loses flexibility unlike the conventional stacking method. ,
During plating work, there is no damage to the cutter edge, guide roll, etc., and there is no risk of shortening their lifespan. Furthermore, compared to the conventional spot welding method, less skill is required for the connection work, so bending of the connection part due to individual differences can be reduced, and therefore, it is possible to stabilize the machining dimensional accuracy before and after the connection part. It is effective and can improve the yield of products.

In addition, since the solder does not leak out of the reinforcing tape during heat-pressing, there is no problem such as contamination of the plating solution, and there is also a gap between both ends of the strip. This prevents deviation of the strip due to bending when passing through the guide rolls, etc., and absorbs repeated bending stress to improve the rupture characteristics of the connection portion.
In addition, these operations can be easily performed in a short period of time, and can be applied universally to both thin and thick strips, making it an extremely effective method for improving the efficiency of connection operations.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view showing a shape in which strips are connected according to an embodiment of the present invention, and FIG. 2 is a diagram showing an original shape of an adhesive reinforcing tape applied to the connection portion shown in FIG. 1. 3 and 4 are views similar to FIG. 2 showing modified examples of the reinforcing tape shown in FIG. 2. 1: Metal strip, 3, 5: End face, 6: Adhesive solder, 7: Adhesive reinforcing tape, 8: Gap.

Claims (1)

[Claims] 1. Both ends of the metal strips to be connected to each other are placed butted against each other, but are not brought into close contact with each other, but with a gap between them. A thin metal foil having a thickness of 1/10 to 3/10 of the metal strip is prepared as an adhesion reinforcing tape, and the adhesive reinforcing tape is applied to both sides of the metal strip, respectively, and heated as it straddles both ends of the metal strip. A method of connecting metal strips consisting of crimping and soldering.