Cold header pierced valve stem

Details Cold header pierced valve stem Cold header pierced valve stem

1994-05-10

1996-02-27

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

29890123, B21K 120

Patent

active

054938872

ABSTRACT:
A method of cold forming a plumbing and heating valve stem by providing a cylindrical blank workpiece, axially stamping the workpiece to circumferentially reduce and axially lengthen a portion of the workpiece, axially stamping the circumferentially larger portion to form a circumferentially enlarged head on the larger portion, while punching a central axial cylindrical cavity in the head to a depth no greater than the axial thickness of said head, and then axially punching the cylindrical axial cavity to a depth greater than the thickness of the head and also stamping a central cylindrical axial cavity into the opposite end, forming self tapping screw cavities. The larger portion is then provided with rolled threads.

REFERENCES:
patent: 2344803 (1944-03-01), Criley
patent: 2581774 (1952-01-01), Stone et al.
patent: 3176329 (1965-04-01), Frame
patent: 3587157 (1971-06-01), Mundt

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