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US 2018/0345349 A1Published application
Method and arrangement for manufacturing of tubes by continuous hydraulic expansion
AssigneeSandvik Intelectual Property AB
InventorDaniel SVEDBERG
Life of this patent
Estimating the term…
Abstract
A method for manufacturing a tube includes continuously moving a tubular hollow blank through an expansion tool, and supplying fluid to a space delimited by the expansion tool and the tubular hollow blank the such that a hydraulic pressure is applied inside the tubular hollow blank. The magnitude of the hydraulic pressure is selected such that the tubular hollow blank is deformed plastically. The disclosure also relates to an arrangement for manufacturing a tube.
Claims15
A method for manufacturing a tube comprising the steps:
- a. providing a tubular hollow blank having a nominal outer diameter and a nominal inner diameter;
- b. providing an expansion tool including an outer tool part and an inner tool part arranged concentrically such that the inner and outer tool parts define an inlet opening for receiving the tubular hollow blank and an outlet opening for a tube having an outer diameter and an inner diameter, wherein the inner tool part includes a first sealing portion for sealably supporting the hollow blank and a second sealing portion for sealably supporting the tube, wherein a space extends between the first sealing portion and the second sealing portion, the space being connected to a fluid source;
- and
- c. continuously moving the tubular hollow blank through the expansion tool, and supplying fluid to the space such that a hydraulic pressure is applied inside the tubular hollow blank, wherein the magnitude of the hydraulic pressure is selected such that the tubular hollow blank is deformed plastically.
1 more element
An arrangement for manufacturing a tube comprising:
- a first tubular housing arranged to receive a tubular hollow blank;
- an expansion tool including an outer tool part and an inner tool part arranged concentrically such that the inner and outer tool parts define an inlet opening for receiving a tubular hollow blank having a nominal outer diameter and a nominal inner diameter and an outlet opening for an expanded tube having a tube outer diameter and a tube inner diameter;
- and
- a pushing arranged to push the tubular hollow blank through the expansion tool, wherein the inner tool part includes a first sealing portion sealably supporting the hollow blank and a second sealing portion sealably supporting an expanded tube, wherein a space extends between the first sealing portion and the second sealing portion, the space being connected to a fluid source.
1 more element
Dependencies are inferred from the claim text.