Method for corrugating a metallic pipe

Details Method for corrugating a metallic pipe Method for corrugating a metallic pipe

1996-06-27

1998-01-27

Larson, Lowell A.

Metal deforming

With temperature modification of tool or of specified...

B21D 3104

Patent

active

057111774

ABSTRACT:
A method of corrugating a metallic pipe which achieves an increase in the limit of tube expansion ratios. First, a heated part is formed by heating a local part of an outer periphery of a pipe in a circumferential direction by a high frequency coil. Next, the heated part is located within a forming surface of a forming die, and an axial compressive stress is applied to the pipe. Thus, the heated part is expanded while restricted by the forming surface. Therefore, even when the axial length of the heated part is increased, formability is stabilized and the tube expansion ratio can be raised.

REFERENCES:
patent: 425022 (1890-04-01), Burkhardt
patent: 653354 (1900-07-01), Maciejewski
patent: 2055535 (1936-09-01), Hopkins
patent: 3198928 (1965-08-01), Allison
patent: 4821551 (1989-04-01), Ogino et al.
patent: 4843857 (1989-07-01), Krieps

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