Method of producing molds

Details Method of producing molds Method of producing molds

1995-05-05

1996-09-24

Batten, Jr., J. Reed

Metal founding

Process

Shaping a forming surface

164 37, 164 38, B22C 15264, B22C 15276, B22C 1528

Patent

active

055581480

ABSTRACT:
Molding sand (5) is fed into a space defined by a pattern plate (2) and a flask (3) mounted on the pattern plate (2), and the space is enclosed at the upper part of the flask (3) by a cover (6). The air in the enclosed space is evacuated to reduce the air pressure between the grains of the molding sand in the enclosed space to 1 Torr to 150 Torr, and then air is introduced into the enclosed space from the upper part of the space so that the pressure in the space can increase at the rate of 15 atm/s to compress the molding sand (5). The method eliminates the need for vent holes and enables the mold to be crack-free since the air flow is not reflected.

REFERENCES:
patent: 4230172 (1980-10-01), Uzaki et al.
patent: 4620584 (1986-11-01), Witt
patent: 4921035 (1990-05-01), Leutwiler
patent: 5348070 (1994-09-01), Fischer et al.

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