Wire-drawing method and system
A wire-drawing method comprises providing a rod comprising a wrapped sheet, wherein the sheet comprises a plurality of copper layers and a plurality of graphene layers; extracting an inner layer of the wrapped sheet from the rod to form a spiral; and forming a wire by feeding the spiral through an opening of a die unit.
1. A wire-drawing method, comprising:
providing a rod comprising a wrapped sheet, wherein the sheet comprises a plurality of copper layers and a plurality of graphene layers;
extracting an inner layer of the wrapped sheet from the rod to form a spiral; and
forming a wire by feeding the spiral through an opening of a die unit.
2. The method according to claim 1 , wherein the opening has at least one of an elliptic cross section and a circular cross section.
3. The method according to claim 1 , wherein the opening has an inclination angle with respect to a feeding direction of the spiral.
4. The method according to claim 3 , wherein the inclination angle is larger than 5°.
5. The method according to claim 3 , wherein the inclination angle is smaller than 30°.
6. The method according to claim 1 , wherein forming the wire comprises:
feeding the spiral through a first opening of the die unit, and subsequently feeding the spiral through a second opening of the die unit downstream of the first opening;
wherein the second opening is smaller than the first opening.
7. The method according to claim 6 , wherein a cross section of at least one of the first opening and the second opening has one of an elliptic cross section and a circular cross section.
8. The method according to claim 6 , wherein the first opening has a first inclination angle with respect to a feeding direction of the spiral, and wherein the second opening has a second inclination angle with respect to a feeding direction of the spiral.
9. The method according to claim 8 , wherein the first inclination angle or the second inclination angle is larger than 5°.
10. The method according to claim 8 , wherein the first inclination angle or the second inclination angle is smaller than 30°.
11. The method according to claim 8 , wherein the second inclination angle differs from the first inclination angle.
12. The method according to claim 1 , wherein feeding the spiral comprises pulling and/or pushing the spiral through the opening.
13. The method according to claim 12 , wherein feeding the spiral comprises pulling the spiral through the opening by means of a plurality of rotating pulling rolls.
14. The method according to claim 1 , wherein the sheet comprises a first copper layer on a first surface side and a second copper layer on a second surface side opposite from the first surface side.
15. The method according to claim 1 , wherein the sheet comprises a copper layer and first and second graphene layers sandwiching the copper layer.
16. A wire-drawing system, comprising:
a die unit comprising an opening;
an extracting unit configured to and operating to extract an inner layer of a wrapped sheet to form a spiral, wherein the sheet comprises a plurality of copper layers and a plurality of graphene layers; and
a feeding unit arranged to feed the spiral through the opening of the die unit.
17. The system according to claim 16 , wherein the opening has one of an elliptic cross section and a circular cross section.
18. The system according to claim 16 , wherein the opening has an inclination angle with respect to a feeding direction of the spiral.
19. The system according to claim 16 , wherein die unit comprises a first opening and a second opening downstream of the first opening in a feeding direction, wherein the second opening is smaller than the first opening.
20. The system according to claim 16 , wherein the feeding unit comprises a pulling unit adapted to pull the spiral through the opening.