Method for removing certain of the corrugations in a helically c

Details Method for removing certain of the corrugations in a helically c Method for removing certain of the corrugations in a helically c

1980-05-09

1986-04-22

Crane, Daniel C.

Metal deforming

By three or more coacting relatively movable tools

Concurrently actuated tools

72370, 72399, 138122, B21D 4104, B21D 4102

Patent

active

045833893

ABSTRACT:
Corrugations are removed from the end of a helically corrugated pipe by compressing the end of the pipe between a plurality of radially movable die segments. By choosing appropriately-shaped die segments and die-actuating cams, the end of the pipe can be expanded, or shrunk to a diameter less than that of an imaginary cylinder defined by a surface of revolution contacting the innermost surfaces of the pipe. Products manufactured in accordance with the method of the invention have an end portion with an accurately controlled diameter; a minimum of pipe length is taken up by the modification.

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