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, particularly made of mainly copper, by means of rolling, in which method in the first working step (F1), a tube billet (1) is worked by rolling with conical rolls (2), 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, characterized in that essentially immediately after the first working step (F1), the tube billet (1) is subjected to at least one second working step (F2) by rolling with a second set of conical rolls (7), so that at least during the first working step (F1) and the second working step (F2), the tube billet (1) is kept in non-oxidizing conditions.
An apparatus for working a tube billet (1) by rolling, said apparatus comprising, in order to perform the first working step (F1), a planetary rolling arrangement including at least one conical roll element (2), characterized in that essentially immediately after the first rolling arrangement, in the proceeding direction (6) of the tube billet (1), there is arranged a second rolling arrangement in order to perform at least one second working step (F2), and that the arrangement comprises means for creating non-oxidizing conditions at least at the first and second rolling arrangement and advantageously between them, too.
Dependencies are inferred from the claim text.