Preventing voids in extruded teeth or splines

Details Preventing voids in extruded teeth or splines Preventing voids in extruded teeth or splines

2008-10-03

2011-11-22

Sullivan, Debra (Department: 3725)

Metal deforming

By extruding through orifice

Utilizing internal forming means

C072S358000

Reexamination Certificate

active

08061174

ABSTRACT:
An apparatus for extruding teeth in a blank includes a press that includes a lower die plate for supporting the blank thereon, and upper die plate that moves along an axis relative to the lower die plate. A mandrel, aligned with the axis, moves with the upper die plate along the axis, and includes die teeth which form gear teeth to net shape by back extrusion. An impingement ring, located between the upper die plate and the blank, has an opening that allows the die teeth of the mandrel to contact the blank, and includes a stinger that forces material of the blank toward the axis during the forming cycle.

REFERENCES:
patent: 4692071 (1987-09-01), Hirota
patent: 4770572 (1988-09-01), Ohkawa et al.
patent: 4772368 (1988-09-01), Rabian
patent: 5465597 (1995-11-01), Bajraszewski et al.
patent: 5538369 (1996-07-01), Okuda
patent: 5551270 (1996-09-01), Bajraszewski et al.
patent: 6204466 (2001-03-01), Tabor

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