JP2010125500A - Method of manufacturing extra fine metal wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of manufacturing an extra fine metal wire, which is less in the degradation of extension performance caused by work hardening by overcoming the weak point of a conventional wire drawing method. <P>SOLUTION: A rolling stage is added after performing a wire drawing stage where the wire rod 10 having a predetermined diameter is obtained by threading a material 10M through the hole 102 of a die 100 and drawing it. In the rolling stage, the extra fine metal wire 10A having the predetermined cross-sectional area is rolled by rotating a pair of rolls 1, 1 which are provided with a working groove 2 corresponding to the cross-sectional shape of the extra-fine metal wire 10A to be manufactured on the outer peripheral surface and applying pressure to the pair of rolls 1, 1 by threading the wire rod 10 of a base stock through the die hole 3 which is formed by the working groove 2 between the respective outer peripheral surfaces 1a, 1a of the pair of the rolls 1, 1. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing an ultrafine metal wire used for an electric wire.

  Conventionally, for example, the production of ultrafine metal wires used for electric wires is based on wire drawing and annealing (heat treatment).

  The wire drawing process is a kind of metal processing for thinning the diameter of the wire (wire, wire) and extending the length. The tool used for this processing is called a die, and has a conical hole with a thick inlet and a thin outlet.

For example, as shown in FIG. 4, the wire drawing is performed by setting the tip of a material (wire material) 110 to a wire drawing machine (not shown) and opening a hole 102 slightly smaller than the diameter of the material 110. This is a method in which the material 110 is pulled through 100 in the direction of arrow F, gradually thinned and wound on a reel (not shown).
JP 2002-129262 A

  By the way, in the case of an ultrafine metal wire (eg, Cu-0.3 wt% Sn alloy (copper alloy)) by a conventional wire drawing method used for, for example, a 0.13 sq electric wire, satisfactory performance is obtained in terms of strength. However, since the elongation performance (extensibility) decreases due to work hardening, it becomes an electric wire that is weak against bending, and when it is used by connecting the electric wire to a connector, it can be restricted to a usable part. There was a problem.

  In view of the above circumstances, an object of the present invention is to provide a manufacturing method capable of recovering a decrease in elongation performance due to a conventional wire drawing method and manufacturing an ultrafine metal wire that is resistant to bending. .

  According to the first aspect of the present invention, there is provided a method for producing an ultrafine metal wire, a wire drawing process for obtaining a wire having a predetermined diameter by drawing a material through a hole of a die, and an ultrafine metal wire to be produced after the wire drawing process. A pair of rolls provided with processing grooves corresponding to the cross-sectional shape on the outer peripheral surface is rotated, and the wire rod after the wire drawing process is passed through the mold hole formed by the processing grooves between the outer peripheral surfaces of the pair of rolls A rolling process for producing an ultrafine metal wire having a predetermined cross-sectional area by rolling by applying pressure with the pair of rolls.

  According to the first aspect of the present invention, by adding a rolling process using a pair of rolls after the wire drawing process, it is possible to recover the elongation performance reduced by work hardening during the wire drawing process. Therefore, it is possible to make an electric wire that is strong against bending, and even when the electric wire is connected to the connector and used, the restriction on the use part of the connector can be removed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a process explanatory view of the embodiment, FIG. 1 (a) is a perspective view showing a state in which a wire drawing process is carried out, and FIG. 1 (b) shows a state in which a subsequent rolling process is carried out. FIG. 2 is a front view showing a mold hole formed between a pair of rolls in a rolling process.

  In the manufacturing method of the present embodiment, first, as a first step, as shown in FIG. 1A, a wire drawing step of obtaining a wire 10 having a predetermined diameter by pulling the material 10M through the hole 102 of the die 100 is performed. To do. That is, the tip of a material (wire material) 10M is set on a wire drawing machine (not shown), and the material 10M is passed through a die 100 having a hole 102 slightly smaller than the diameter of the material 10M and pulled in the direction of arrow F. Then, the wire 10 having a predetermined diameter is obtained by gradually stretching it thinly.

  Next, a rolling process is performed. In this step, first, a pair of rolls 1 and 1 having a processed groove 2 corresponding to the cross-sectional shape of the ultrafine metal wire 10A to be finally manufactured is prepared. Then, while rotating the pair of rolls 1, 1 in the direction of arrow A, the wire 10, which is a material, is formed in the mold hole 3 formed by the machining groove 2 between the outer peripheral surfaces 1 a, 1 a of the pair of rolls 1, 1. Then, by applying pressure with a pair of rolls 1 and 1, the ultrafine metal wire 10A having a predetermined cross-sectional area is rolled. Arrow B indicates the rolling direction.

  Thus, when a rolling process is implemented after a wire drawing process, the elongation rate until a fracture | rupture will increase rather than the case of only the conventional wire drawing method.

  FIG. 2 shows the results of testing samples a, b, c, d, and e manufactured only by the wire drawing method, and samples f, g, and h manufactured by performing the rolling method after the wire drawing method. .

  As is clear from the results, the sample when the rolling method is performed after the wire drawing method is slightly inferior to the sample in the case of only the wire drawing method in terms of tensile strength, but in terms of the elongation rate, It turns out that it is superior to the case of only the wire drawing method.

  In this way, an extra fine metal wire manufactured by adding a rolling method after the wire drawing method is superior in elongation performance to an extra fine metal wire produced only by the conventional wire drawing method, so this extra fine metal wire should be used. Thus, an electric wire excellent in flexibility can be produced. Therefore, by using the electric wire connected to the connector, it is possible to remove the restriction on the use part of the connector.

It is process explanatory drawing of the manufacturing method of embodiment of this invention, (a) is a perspective view which shows the state which is implementing the wire drawing process, (b) shows the state which is implementing the subsequent rolling process It is a perspective view. It is a front view which shows the die hole formed between a pair of rolls in the said rolling process process. It is a characteristic view which shows the result of having compared the performance of the sample manufactured by the method of this embodiment, and the sample manufactured by the conventional wire drawing method. It is explanatory drawing of the conventional wire drawing method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1 A pair of roll 1a Outer peripheral surface 2 Process groove 3 Mold hole 10 Wire which is a raw material 10A Extra fine metal wire 10M Material 100 Dice 102

Claims (1)

A wire drawing process for obtaining a wire of a predetermined diameter by pulling a material through a hole of a die;
After this wire drawing step, a pair of rolls having a processing groove corresponding to the cross-sectional shape of the ultrafine metal wire to be manufactured are rotated on the outer peripheral surface, and the processing groove is formed between the outer peripheral surfaces of the pair of rolls. A rolling process for producing an ultrafine metal wire having a predetermined cross-sectional area by rolling through the wire after the wire drawing process and applying pressure with the pair of rolls to the mold hole to be formed. A method for producing an ultrafine metal wire.

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