Method and apparatus for making multi-layer spiral pipe

Details Method and apparatus for making multi-layer spiral pipe Method and apparatus for making multi-layer spiral pipe

B - Operations, Transporting

21

D

113/47

B21D 51/00 (2006.01) B21D 53/00 (2006.01)

Patent

CA 1076889

METHOD AND APPARATUS FOR MAKING MULTI-LAYER SPIRAL PIPE ABSTRACT OF THE DISCLOSURE An apparatus and method for continuously forming multi-layer metal pipe from at least two elongated sheets of metal. One sheet is impressed with longitudinal corrugations in a rolling device and the second sheet, being uncorrugated, is then positioned con- tiguously upon the first, forming a multi-layer sheet. One or more removable modules is mounted in the rolling device to accu- rately align and guide the second sheet into position upon the first. Complementary portions of a single corrugation are then formed in the marginal edges of the multi-layer sheet and the sheet is spiralled into adjacent, helical convolutions in a pipe forming device, with the uncorrugated sheet forming the pipe interior. The adjacent convolutions are joined in a helical seam in the single corrugation by a seaming device located in the pipe forming device. In the primary embodiment of the invention, the seam is formed as a double lock seam along a neutral axis of the single corrugation.

331154

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