Method and apparatus for cold sizing a round workpiece having mu

Details Method and apparatus for cold sizing a round workpiece having mu Method and apparatus for cold sizing a round workpiece having mu

1988-07-15

1989-05-16

Spruill, Robert L.

Metal deforming

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

During rotation of work

72 88, B21B 108, B21B 2700

Patent

active

048298000

ABSTRACT:
An apparatus (12) for cold sizing a round workpiece (14) having round surfaces of cylindrical shapes that are coaxial about a central axis A of the workpiece and have different diameters. A support (54,55) rotatably mounts the workpiece (14) about its central axis A between a pair of die assemblies (24a, 24b) which are spaced from each other. Each die assembly (24a,24b) includes a plurality of dies (56,58,60,62) that are respectively aligned with the round surfaces (46,48,50,52) of the workpiece (14). Movement of the die assemblies in opposite directions as each other engages sizing surfaces (66,68,70,72) of the dies with the aligned round surfaces of the workpiece to pressure size the workpiece surfaces. In one embodiment of the sizing apparatus (12), the die assemblies (24a, 24b) have elongated shapes and are moved rectilinearly in a parallel relationship to each other to perform the sizing. Another rotary embodiment of the sizing apparatus (12') includes rotary die assemblies (24a',24b' ) mounted by associated spindles (85) whose rotation likewise pressure sizes the round workpiece surfaces. Both embodiments of the sizing apparatus are disclosed as including forming projections for forming projections such as splines (82) and/or a helical thread (84) on the sized surfaces of the workpiece.

REFERENCES:
patent: Re22737 (1946-04-01), Bailey
patent: 3495428 (1970-02-01), Marcovitch
patent: 4155236 (1979-05-01), Jungesjo

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