Apparatus and method for reshaping tubes
AssigneeLindab AB
InventorLars-Ake Mattsson
Life of this patent
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Abstract
In a method of reshaping a tube, an apparatus is used which has a roller nip for rotating the tube, and a shaping roller assembly for altering the cross-section of the tube, for instance from round to oval.
Claims21
An apparatus for reshaping a tube, said tube having a wall with a periphery, an inner surface, an outer surface, a longitudinal axis and a cross-section having at least one radius of curvature, comprising:
- means configured to rotate said tube about said longitudinal axis in said apparatus;
- a first shaping roller parallel with said longitudinal axis of said tube and configured to engage said outer surface of said tube;
- a second shaping roller parallel with said longitudinal axis of said tube and configured to engage said inner surface of said tube;
- and
- means configured to move said first and second shaping rollers in relation to each other and in relation to said rotation means, in order to apply bending forces to said tube wall for altering said at least one radius of curvature and thereby reshaping said cross-section of said tube.
A method of reshaping a tube, said tube having an inner surface, an outer surface, a longitudinal axis and a cross-section having at least one radius of curvature, comprising the steps of:
- rotating said tube about said longitudinal axis;
- and
- applying bending forces to said inner and outer surfaces of said tube;
- thereby altering said at least one radius of curvature for reshaping said cross-section of said tube.
A roller unit for reshaping a tube having a cross-section and a longitudinal axis, comprising:
- a first roller assembly configured to rotate said tube about said longitudinal axis,
- a second roller assembly configured to apply bending forces to said tube directed towards or away from said tube, thereby altering said cross-section of said tube.
Use of a roller arrangement for reshaping of a tube being rotated, at least one shaping roller being disposed inside said tube whereas at least one shaping roller is disposed outside said tube.
Dependencies are inferred from the claim text.