Method of drawing ribs on tubes

Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work

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72 98, 72370, B21D 5306

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active

046127909

ABSTRACT:
A method of forming ribs on tubes or pipes is characterized by applying to the material of the tube, from which the rib is formed, initial compressive stresses preferably ##EQU1## where Fo denotes the area of the cross-section of the tube before drawing, Fr denotes the area of the cross-section of the core of the tube after drawing the rib, and Re is the plasticity limit. Next, ribs are drawn by driven tools with roll-formed disks while maintaining said compressive stress.

REFERENCES:
patent: 2337490 (1943-12-01), Penner
patent: 3461701 (1969-08-01), Marcovitch
patent: 4153982 (1979-05-01), Przybyla et al.

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