Cold drawing technique and apparatus for forming internally groo

Details Cold drawing technique and apparatus for forming internally groo Cold drawing technique and apparatus for forming internally groo

1987-06-19

1989-08-08

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

With metal deformation of different type

72283, B21C 124

Patent

active

048541486

ABSTRACT:
Formation of continuous grooves on the internal surface of a tube shell, in a single continuous cold drawing step, in which the tube shell is first sunk in a die over a reduced diameter cylindrical mandrel portion so that the diameter of the inner surface of the tube shell is reduced to a dimension below the base of the grooves of a grooved plug portion of the mandrel thereby retarding longitudinal movement of a portion of the reduced internal surface of the sunk tube shell at a plurality of circumferentially spaced intervals to effect formation of longitudinally continuous shallow grooves. The mandrel is allowed to rotate if it is desirable to facilitate the formation of spiral grooves on the tube inner surface.

REFERENCES:
patent: 4313328 (1982-02-01), Janssen et al.
patent: 4646548 (1987-03-01), Zimmerli et al.

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