Method of preparing bimetallic tubes for roll-forming ribs

Details Method of preparing bimetallic tubes for roll-forming ribs Method of preparing bimetallic tubes for roll-forming ribs

1984-06-19

1987-04-14

Goldberg, Howard N.

Metal working

Method of mechanical manufacture

Assembling or joining

29520, B21D 3900, B23P 1100

Patent

active

046567194

ABSTRACT:
A method of preparing bimetallic tubes or pipes for roll-forming ribs therefrom, in which the external tube is subjected to initial compressive stress is introduced, is characterized by roughening the ends of the internal tube, and after placing the internal tube in the external tube the ends of the external tube are clamped on the roughened segments of the internal tube with simultaneous axial displacement of a part of the material of the external tube corresponding to said compressive stresses of a required quantity. From the tube assembly thus prepared ribs are drawn. It is preferable that at least one end of the external tube is formed conically during clamping.

REFERENCES:
patent: 1960042 (1934-05-01), Andrus
patent: 3239931 (1966-03-01), Guarnaschelli
patent: 3461523 (1969-08-01), Peehs et al.
patent: 4125924 (1978-11-01), Goetze et al.
patent: 4400862 (1983-08-01), Ignell
patent: 4403385 (1983-10-01), Kirk

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