Pattern for producing a mold and method for manufacture of the p

Details Pattern for producing a mold and method for manufacture of the p Pattern for producing a mold and method for manufacture of the p

1982-03-11

1985-08-20

Goldberg, Howard N.

Metal founding

Process

Shaping a forming surface

164 34, 164 45, 164228, 164230, B22D 1310

Patent

active

045358311

ABSTRACT:
A method of producing a pattern for use in the manufacture of a mold which is adapted to be cured by microwave irradiation. The method comprises forming a rolled-over male pattern, forming a rolled-over female pattern having a scale-off layer along a boundary thereof with the male pattern, removing the scale-off layer, pouring a silicone RTV rubber into a cavity of the female pattern to form a match plate therein, setting a metallic frame on the match plate, filling the interior of the metallic frame with a mixture of microwave-pervious resin and dry silica sand, causing the mixture to be thermally cured thereby forming a reinforcing layer on the peripheral surface of the match plate, placing the male pattern within the reinforcing layer after removing the match plate therefrom, and injecting a microwave-pervious silicone rubber into the gap formed between the reinforcing layer and the male pattern thereby forming a mold defining layer on the inner surface of the reinforcing layer.

REFERENCES:
patent: Re26785 (1970-02-01), Kaplan
patent: 2399373 (1946-04-01), Miller
patent: 2755528 (1956-07-01), Bucken
patent: 3204303 (1965-09-01), Chandley
patent: 4254544 (1981-03-01), Barker
Plaster Plugs from Rubber Molds, C. W. Ammen, "Foundry", vol. 84, No. 2, Feb. 56, pp. 142, 146, 149.

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