Method for producing insulated electric wire

Patent metadata

Field	Value
Publication number	US-9875827-B2
Application number	US-201314404731-A
Country	US
Kind code	B2
Filing date	May 31, 2013
Priority date	Jun 1, 2012
Publication date	Jan 23, 2018
Grant date	Jan 23, 2018

Abstract

A method for producing an insulated electric wire comprises a first step of processing a copper alloy containing a tin and inevitable impurities into a fine wire having a diameter of 0.21 mm±0.008 mm, the tin being 0.30 wt % or more and 0.39 wt % or less, a second step of annealing the fine wire obtained in the first step so as to refine the fine wire to have an extension coefficient of 10% or more and 25% or less and a tensile strength of 300 MPa or more and 400 MPa or less, and a third step of twisting the seven fine wires having undergone the second step with a twist pitch of 15 mm±6 mm.

First claim

The invention claimed is:

1. A method for producing an insulated electric wire, the method comprising:
a first step of processing a copper alloy containing a tin and inevitable impurities into a fine wire having a diameter of 0.21 mm±0.008 mm, the tin being 0.30 wt % or more and 0.39 wt % or less;
a second step of annealing the fine wire obtained in the first step so as to refine the fine wire to have an extension coefficient of 10% or more and 25% or less and a tensile strength of 300 MPa or more and 400 MPa or less; and
a third step of twisting seven fine wires having undergone the second step with a twist pitch of 15 mm±6 mm,
wherein when an annealing temperature of the second step is set as 400° C., an annealing time of the second step is between 300 seconds and 600 seconds,
wherein when the annealing temperature of the second step is set as 450° C., the annealing time of the second step is between 60 seconds and 600 seconds, and
wherein when the annealing temperature of the second step is set as 500° C., the annealing time of the second step is between 30 seconds and 180 seconds.

2. The method according to claim 1 , further comprising:
a fourth step of making a twisted wire obtained through the third step insulation-coated with a polyvinyl chloride resin composition having a smoking temperature of 170 degrees with a thickness of 0.27 mm or more and 0.35 mm or less, making the insulated electric wire to have a finishing outer diameter of 1.2 mm.

Assignees

• Yazaki Corp

Inventors

• Yoshinaga Satoru
• Yamano Satoshi

Classifications

• H01B3/448

  from other vinyl compounds · CPC title

• H01B1/026

  Alloys based on copper · CPC title

• Y10T29/49117

  Conductor or circuit manufacturing · CPC title

• H01B13/06

  Insulating conductors or cables (H01B13/32 takes precedence) · CPC title

• H01B13/0036 Primary

  Details · CPC title