Preparation of foundry moulds and cores

Details Preparation of foundry moulds and cores Preparation of foundry moulds and cores

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.

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