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

1987-01-28

1988-06-21

Crane, Daniel C.

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

72393, 72402, 72370, B21D 4104, B21D 4102

Patent

active

047518391

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.

REFERENCES:
patent: 852478 (1907-05-01), Voris
patent: 919997 (1909-04-01), Zelch
patent: 942466 (1909-12-01), Schnuerer
patent: 1706910 (1929-03-01), Wright et al.
patent: 1807824 (1931-06-01), Booth
patent: 2225345 (1940-12-01), Lamoreaux
patent: 3338082 (1967-08-01), Steele
patent: 4044581 (1977-08-01), Meserole
patent: 4583389 (1986-04-01), Thomas

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