JP2000096291A - Production of linear conductor for cable having flexibility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the contact resistance of a cable and to improve the solder wettability thereof by applying silver plating on linearly worked phosphor bronze and thereafter executing annealing treatment at a high temp. SOLUTION: Phosphor bronze worked into a desired linear shape is applied with silver plating and is thereafter subjected to annealing treatment at a high temp. of about 700 to 800 deg.C. Since the melting point of silver plating is 961 deg.C, the annealing treatment can sufficiently be executed at this temp. below the melting point. Moreover, since the temperature can be held higher than that in tinning, the annealing time can be reduced, moreover, the reduction of the contact resistance value and the improvement of solder wettability are attained compared to the case of tinning, and low wear resistance can be maintained. The silver plating is executed by electroplating in such a manner that the linear shape of the phosphor bronze as the stock is charged to the minus side. As the thickness of the silver plating, about 3 micron is desirable. After the annealing, the linear phosphor bronze is coiled and is fed to a desired cable working factory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flexible linear conductor in a cable for communication and a computer.

[0002]

2. Description of the Related Art When manufacturing a linear conductor of a cable, for example, a linear material such as copper or a copper alloy (phosphor bronze) is drawn, then annealed, and then tin (Sn) in a molten state is obtained. Usually, a hot-dip metal plating treatment is carried out using as a plating bath.

[0003]

In the above example, about 70
Although a linear conductor of phosphor bronze (CuSnP) is passed through the furnace at a temperature of 0 ° C. for approximately one minute to anneal, and then tin-plated, the melting temperature of tin (Sn) is 240
° C, it was not possible to perform the tin plating first.

[0004] In addition to tin plating, if metal plating can be performed first, metal plating can be outsourced in the annealing process, and the processing process can be simplified. . Therefore, since the annealing treatment is performed at a temperature of approximately 700 ° C., the metal must have a higher melting temperature. In addition, the contact resistance and wettability must be good.

Accordingly, the present invention provides a method of manufacturing a linear conductor for a cable, which allows plating before annealing.

[0006]

According to the present invention, there is provided a method for manufacturing a flexible linear conductor for a cable, which comprises applying a silver plating to phosphor bronze processed into a desired linear shape, and thereafter applying 700 ° C.
From 800 ° C. to 800 ° C. (claim 1).

For this reason, since the melting point of silver plating is 961 ° C., annealing can be sufficiently performed at a temperature equal to or lower than the melting point temperature. In addition, since the annealing time can be kept higher than the annealing treatment at the time of tin plating, the annealing time can be shortened, and the contact resistance value is improved, the solder wettability is improved, and the low friction property is maintained as compared with the tin plating.

[0008]

FIG. 1 shows a process of the present invention, in which phosphor bronze (Cu-Sn-P) is processed into a desired linear shape in a wire drawing process 1. For example, as the phosphor bronze, tin (Sn) is 3 to 9% and phosphorus (P) is 0.03 to
An alloy of 0.35% and copper (Cu) 91 to 97% is processed to a thickness of 0.100 mm and a width of 0.500 mm.

The silver plating step 2 is performed by electroplating, and is performed by charging a phosphor bronze linear material on one side. The thickness of the silver plating is about 3 microns. After the silver plating, annealing is performed.

The annealing step 3 is performed by passing through a heating furnace and passing through a temperature of about 700 ° C. to 800 ° C. for about 1 minute. After annealing, it is wound and sent to a desired cable processing plant.

By performing the silver plating process, the contact resistance is reduced by about 1/2 compared with the conventional tin plating process. Further, the solder wettability was improved by about 20% as compared with that of the conventional tin plating. Furthermore, silver has low friction properties compared to tin.

[0012]

As described above, according to the present invention, silver plating is performed before annealing, and the melting point of silver plating is 961 °.
C, annealing is sufficiently performed below this melting point, and the annealing temperature is 700 ° C. lower than that of the conventional tin plating.
It can be performed at about C to 800 ° C. Hydrogen is generated at the boundary between the cloth (phosphor bronze) and the silver plating layer during silver plating, but can be discharged by heating during annealing, and the silver plating layer can be prevented from peeling off in the presence of hydrogen. . In addition, silver plating reduces contact resistance (approximately ２) than tin plating, improves solder wettability, and also has low friction characteristics.

[Brief description of the drawings]

FIG. 1 is a manufacturing process diagram of a flexible cable linear conductor.

[Explanation of symbols]

 1 wire drawing process 2 silver plating process 3 annealing process

Claims (1)

[Claims] 1. Manufacture of a flexible linear conductor for a cable in which phosphor bronze processed into a desired linear shape is subjected to silver plating and then subjected to an annealing treatment at a high temperature of about 700 ° C. to 800 ° C. Method.