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A tubing mill for roll forming a strip of metal into a fluted tube having alternating longitudinally extending high and low portions on its outside surface. The mill includes feed means for supplying a generally planar strip of metal and embossing means for forming the high and low portions on the s

A tubing mill for roll forming a strip of metal into a fluted tube having alternating longitudinally extending high and low portions on its outside surface. The mill includes feed means for supplying a generally planar strip of metal and embossing means for forming the high and low portions on the surface of the strip to be formed into the outside surface of the tube. The mill also includes breakdown means for sequentially transversely bending the strip from its planar condition. The breakdown means includes roller means having a gripping surface for engaging the strip and having alternating high and low portions shaped to mate with those of the strip. Additionally, the mill includes closure means for bringing into abutment the lateral ends of the bent portions of the strip, and welding means for seam welding the ends together.

대표청구항 ▼

A tubing mill for roll forming a strip of metal into a fluted tube having alternating, longitudinally extending, substantially continuous high and low portions on its outside surface, said mill comprising: feed means for supplying a generally planar strip of metal; embossing means for forming said h

A tubing mill for roll forming a strip of metal into a fluted tube having alternating, longitudinally extending, substantially continuous high and low portions on its outside surface, said mill comprising: feed means for supplying a generally planar strip of metal; embossing means for forming said high and low portions on both the surface of said strip to be formed into the outside surface of said tube and the surface of the strip to be formed into the inside surface of said tube; breakdown means for sequentially transversely bending said strip from its generally planar condition, said breakdown means comprising roller means having a gripping surface for engaging one of said surfaces of said strip and having alternating high and low portions shaped to mate with those of said strip so that the high and low portions of said gripping surface make substantially full surface contact with their corresponding high and low portions on said one surface of said strip; closure means for bringing together the lateral sides of the bent portion of said strip; welding means for welding said lateral sides together; and coating means for applying a coating to the outside surface of the welded tube, said mill further comprising downstream of said coating means a means for applying tension to said tube whereby said breakdown means and said means for applying tension cooperate to prevent substantial sagging of the tube therebetween.