Pressure-casting method and apparatus

Details Pressure-casting method and apparatus Pressure-casting method and apparatus

1994-12-09

1996-10-01

Batten, Jr., J. Reed

Metal founding

Process

With measuring, testing, inspecting, or condition determination

164120, 1641548, 164312, 164319, B22D 1732, B22D 1802, B22D 2709

Patent

active

055604196

ABSTRACT:
In a pressure-casting method and apparatus, wherein a metal melt is fed in a mold cavity and then an oscillating squeeze pressure is applied to the melt by a squeezing plunger of a hydraulic cylinder moving with an oscillating stroke varying to compensate for shrinkage of the melt while being solidified, the hydraulic cylinder is feedback-controlled, using a control unit including a detector for detecting information on an actual squeeze pressure, so that a pressure converted from the actual oscillating squeeze pressure to have a mean value of zero copies a desired alternately positive and negative impulsive pressure pattern or locus representing a pressure oscillated to have a mean value of zero with a given amplitude and frequency versus an elapse of time.

REFERENCES:
patent: 4844146 (1989-07-01), Kikuchi
patent: 4884621 (1989-12-01), Ban et al.
patent: 4932458 (1990-06-01), Iwamoto et al.
patent: 5119866 (1992-06-01), Mihara
patent: 5161598 (1992-11-01), Iwamoto et al.
Iten, Leo, et al. "Funktion und anwendungstechnischer Nutzen einer sekundaarstrom-und echtzeitgeregelten Druckgieszeinheit," Giesserei 79 (1992) Nr. 9-27 Apr., pp. 347-354 and English language abstract.

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