Method of making mold

Details Method of making mold Method of making mold

1981-11-12

1984-08-28

Lin, Kuang Y.

Metal founding

Process

Shaping a forming surface

164 16, B22C 1500, B22C 912

Patent

active

044678550

ABSTRACT:
A method of making a mold having the steps of supplying a molding sand containing a gas-hardenable binder into a space defined by a patter plate and a molding flask, covering the upper surface of the molding sand in a gas-tight manner with a film sheet, bringing the space in the molding flask into communication with a vacuum source to reduce the pressure in the space thereby to squeeze the molding sand by means of the film sheet, closing, after removing the film sheet, the upper opening of the molding flask, and connecting a hardening gas source to the space in the molding flask while reducing the pressure in the space to induce a hardening gas into the molding flask to make the gas penetrate the molding sand, thereby to harden the molding sand.

REFERENCES:
patent: 4129165 (1978-12-01), Edwards

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