Method and apparatus for manufacturing tubes by rolling
AssigneeOutokumpu Oyj
InventorMatti Leiponen
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Abstract
A method for manufacturing a tube made of a non-ferrous material, particularly a tube made of mainly copper, by rolling, in which method, in the first working step the tube billet is worked by rolling with conical rolls, so that mainly owing to the deformation resistance, the temperature of the 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 one second working step with a second set of conical rolls, in which case the tube billet is maintained, at least during the first working step and at least a second working step in non-oxidizing conditions. The invention also relates to an apparatus.
Claims24
A method for manufacturing a tube made of a non-ferrous material, comprising:
- feeding a tube billet in predetermined feeding direction through a first rolling station and a second rolling station, wherein the second rolling station downstream of the first rolling station with respect to the feeding direction of the tube and the second rolling station is so located relative to the first rolling station that simultaneously a first length segment of the tube billet is located in the first rolling station and a second length segment of the tube billet is located in the second rolling station and a length segment of the tube billet that leaves the first rolling station substantially immediately enters the second rolling station,
- working the tube billet in the first rolling station by rolling with conical rolls, so that mainly owing to deformation resistance, the temperature of the billet under operation rises up to the recrystallization range, at least on the working spot,
- working the tube billet at the second rolling station by rolling with a second set of conical rolls, 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 by rolling, 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 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 rolling arrangement including at least one conical roll element for performing a first working step and the second rolling arrangement performs at least one second working step, and
- means for creating non-oxidizing conditions at least at the first and second rolling arrangements.
Dependencies are inferred from the claim text.