Method and apparatus for manufacturing tubes
AssigneeOutokumpu Oyj
InventorMatti Leiponen
Life of this patent
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Abstract
A method for manufacturing a tube made of a non-ferrous material, particularly a tube made of mainly copper, in which method, in the first working step the tube billet is worked so that mainly owing to the deformation resistance, the temperature of the tube billet under operation rises up to the recrystallization range, at least on the spot that is being worked. Essentially immediately after the first working step, the tube billet is subjected to at least a second working step and the tube billet is maintained, at least during the first and second working step in non-oxidizing conditions. the invention also relates to an apparatus.
Claims25
A method for manufacturing a tube made of a non-ferrous material, comprising:
- feeding a tube billet in a predetermined feeding direction through a first working station and a second working station, wherein the second working station is downstream of the first working station with respect to the feeding direction of the tube billet and the second working station is so located relative to the first working station that simultaneously a first length segment of the tube billet is located in first working station and a second length segment of the tube billet is located in the second working station and a length segment of the tube billet that leaves the first working station substantially immediately enters the second working station,
- working the tube billet in the first working station so that mainly owing to deformation resistance, the temperature of the tube billet under operation rises up to the recrystallization range, at least on the working spot,
- working the tube billet in the second working station, and
- keeping at least the first and second length segments of the tube billet in non-oxidizing conditions.
An apparatus for working a tube billet, said apparatus comprising:
- first and second rolling arrangements, wherein the second rolling arrangement is downstream of the first rolling arrangement with respect to a feeding direction of the tube billet and the second rolling arrangement is so located relative to the first rolling arrangement that simultaneously a first length segment of the tube billet is located in the first rolling arrangement and a second length segment of the tube billet is located in the second rolling arrangement and a length segment of the tube billet that leaves the first rolling arrangement substantially immediately enters the second rolling arrangement, wherein the first rolling arrangement comprises a planetary arrangement including at least one roll element for performing a first working step and the second rolling arrangement performs at least a second working step, and
- means for creating non-oxidizing conditions, so that at least during the first and second working steps the tube billet is kept in non-oxidizing conditions.
Dependencies are inferred from the claim text.