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US 2001/0042773 A1Published application
Process for the production of metal pipes
AssigneeNexans
InventorsFriedrich Harten, Michael Meyer
Life of this patent
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AssigneeNexans
InventorsFriedrich Harten, Michael Meyer
Estimating the term…
A process for the production of metal pipes is described in which a thin-walled metal band inclined toward cold spots is gradually formed into a slotted pipe, the longitudinal edges lying flush against one another are welded to one another, and the welded pipe is reduced in its diameter. The form[illegible] of the metal band into the slotted pipe is done by opposing metal forming rollers or forming cylinders cooperating pairwise. The forming rollers or forming cylinders guide the metal band to be deformed in its edge area with rolling friction between them. Therein the forming and guiding of the metal band is done with forming rollers and/or foming cylinders and the reduction with rollers whose surface hardness is greater than 100 GPa.
Process for the production of metal pipes in which a thin-walled metal band inclined toward cold spots is gradually formed into a slotted pipe, the longitudinal edges lying flush against one another are welded to one another, and the welded pipe is reduced in its diameter, where the forming of the metal band into the slotted pipe is done by opposing metal forming rollers or forming cylinders cooperating pairwise and the forming rollers or forming cylinders guide the metal band to be deformed in its edge area with rolling friction between them characterized by the fact that the forming and guiding of the metal band is done with forming rollers and/or forming cylinders and the reduction is done with rollers whose surface hardness is higher than 100 GPa.
Apparatus for the production of metal pipes with a forming device forming a thin-walled metal band inclined toward cold spots, a welding device welding the longitudinal edges of the slotted pipe, as well as a device reducing the diameter of the pipe, where the forming device consists of opposing metal forming rollers or forming cylinders cooperating pairwise which guide the metal band in its edge area with rolling friction between them characterized by the fact that the forming rollers and/or forming cylinders have a surface hardness of more than 100 GPa and that the device for reducing the pipe diameter is a so-called turk's head whose rollers also have a surface hardness of more than 100 GPa.
Dependencies are inferred from the claim text.