Producing a thread on a tube.

摘要

"A method of and apparatus for producing a formation such as a screw thread (27) on a tube (2) comprising the steps of forcing a surface of the tube such as by a mandrel (18) against a pattern member (4, 5) having a pattern thereon so as to displace the material of the tube (2) into the pattern to form the formation on the surface of the tube."