Wire drawing method and wire drawing device
AssigneeHitachi, Ltd.
InventorsYounjeong Hong, Chengting Hsieh
Life of this patent
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Abstract
A wire drawing method includes: preparing a first wire rod that includes a first pipe having a first longitudinal length and a second pipe having a second longitudinal length different from the first longitudinal length; creating a second wire rod that includes the first pipe having a third longitudinal length and the second pipe having a fourth longitudinal length different from the third longitudinal length, by reducing a cross-sectional diameter of the first wire rod through wire drawing; and setting a first difference between the third longitudinal length and the fourth longitudinal length in the second wire rod to be smaller than a second difference between the first longitudinal length and the second longitudinal length in the first wire rod.
Claims8
A wire drawing method comprising:
- preparing a first wire rod by surrounding a first rod with a first pipe having a first longitudinal length and a second pipe having a second longitudinal length different from the first longitudinal length;
- creating a second wire rod that includes the first pipe having a third longitudinal length and the second pipe having a fourth longitudinal length different from the third longitudinal length, by reducing a cross-sectional diameter of the first wire rod through wire drawing;
- and
- setting a first difference between the third longitudinal length and the fourth longitudinal length in the second wire rod to be smaller than a second difference between the first longitudinal length and the second longitudinal length in the first wire rod.
Dependencies are inferred from the claim text.