Pressure controlled fluid pressure extrusion method

Details Pressure controlled fluid pressure extrusion method Pressure controlled fluid pressure extrusion method

2007-10-23

2007-10-23

Banks, Derris H. (Department: 3725)

Metal deforming

By extruding through orifice

C072S057000, C072S271000

Reexamination Certificate

active

10431114

ABSTRACT:
The lower part of a material to be molded forms a lower, seal with a die. A punch applying a molding force to the material forms an upper seal with the perimeter of the die. The space between the upper and lower, seals forms a pressure chamber that is filled with a fluid. As the punch descends into the die, the fluid is pressurized. The lower seal is a complete seal to prevent leakage of fluid into the die. The upper seal is given a clearance with the die that permits controlled leakage of fluid therepast at a rate that limits the maximum pressure in the pressure chamber while permitting the development of an adequate pressure on the material being molded.

REFERENCES:
patent: 796970 (1905-08-01), Hoopes
patent: 2781016 (1957-02-01), Livermont
patent: 3382691 (1968-05-01), Green
patent: 3765222 (1973-10-01), Lundback
patent: 3768344 (1973-10-01), Feldcamp
patent: 3983730 (1976-10-01), Fiorentino
patent: 1215452 (1970-12-01), None

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