Manufacture of split tubes

Details Manufacture of split tubes Manufacture of split tubes

B - Operations, Transporting

21

C

80/12

B21C 37/08 (2006.01)

Patent

CA 1158462

ABSTRACT In the bending of strips or skelps of different widths into split tubes or pipes which are subsequently closed and welded to form completed pipes of correspondingly varying diameters, the bending is done in a series of progressive bending stages constituting a set. Each stage provides a particular degree of bending. For a strip of a particular width, only a selected group of the avail- able set of bending stages is used. The set of stages available may include a little less than twice the number of stages used in any group, the number of stages in each group being always the same. The set of stages includes one for providing the smallest curvature and a last one for providing the largest curvature. These stages are never used together. The first one serves as the first stage in a group selected for bending the widest strip, and the last one will be used as the last stage in the group selected for completing the smallest diameter tube. Each stage is formed by a plate which has a slot outlining the curvature to be imparted by that stage, bending rollers being journalled along the slot on both sides of the plate. The selected set of plates for a given bending operation are arranged in series within a frame, and are readily remov- able and replaceeable when a bending operation on a different width strip is to be performed.

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