Process for forming internal gear profile cup-shaped member and

Details Process for forming internal gear profile cup-shaped member and Process for forming internal gear profile cup-shaped member and

1986-12-30

1988-04-26

Spruill, Robert L.

Metal deforming

By use of closed-die and coacting work-forcer

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

72264, 291592, B21C 2303, B21K 176

Patent

active

047396440

ABSTRACT:
A cup-shaped raw workpiece having a bottom panel and a cylindrically-shaped circumferential panel is positioned facing downwardly on a movable lower punch having a forming gear profile. The lower punch is provided in a die having an orifice portion which together with the gear profile defines an orifice. A resilient mechanism resists downward movement of the lower punch. An upper punch is lowered to hold the bottom panel of the workpiece against the lower punch and pushes the workpiece to extrusion form the inner surface thereof through the orifice. An escape groove for excess metal can be provided in the bottom inside corner of the workpiece at the juncture of the circumferential panel and the bottom panel. The lower punch can be provided with an upwardly extending protrusion near the outer circumferential edge of the upper end surface thereof which has an outer chamfered circumferential edge.

REFERENCES:
patent: 3861191 (1975-01-01), Sato et al.
patent: 4166373 (1979-09-01), Braun

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