Metal founding – Process – Shaping a forming surface
Patent
1977-11-02
1978-12-12
Flint, Jr., J. Howard
Metal founding
Process
Shaping a forming surface
164 16, 164160, 164171, B22C 900
Patent
active
041291654
ABSTRACT:
To compact a sand-binder mixture in a mould or core box and subsequently apply a hardening gas to the mixture, I apply to the open top of the box a fluid-pervious diaphragm backed by an impervious diaphragm, apply suction to the bottom of the box to draw the diaphragm against the top of the mixture and compact the mixture, and subsequently introduce the hardening gas between the diaphragms so that it passes through the first diaphragm and permeates the mixture within the box.
REFERENCES:
patent: 2962776 (1960-12-01), Taccone
patent: 3156958 (1964-11-01), Miller et al.
patent: 4069858 (1978-01-01), Edwards
P. Schneider, "Production of Castings by Vacuum-Sealed Moulding Process Using Binderless Sand" 6/74, Foundry Trade Journal, p. 723.
Baker Perkins Holdings Limited
Flint, Jr. J. Howard
Lin K. Y.
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