Method of producing polymeric patterns for use in evaporable foa

Details Method of producing polymeric patterns for use in evaporable foa Method of producing polymeric patterns for use in evaporable foa

1994-01-25

1996-05-21

Bradley, P. Austin

Metal founding

Process

Shaping a forming surface

164 34, 164 46, B22C 700, B22C 902, B22D 2300

Patent

active

055180604

ABSTRACT:
A method of producing polymeric foam patterns for use in evaporable foam casting. A positive three-dimensional model of the metal part to be cast is made by a layered prototyping process in which layers of sheet material are bonded in superimposed relation and the contour of the part to be cast is cut into each layer as it is applied to preceding layers to provide the model. A metal, such as copper, is then deposited on the working surface of the model to provide a rigid self-supporting shell having a surface which is the negative image of the part to be cast. The shell, after separation from the model, is then mounted in a die casting mold with the negative surface bordering a die cavity. Beads of a polymeric material, such as polystyrene, are introduced into the die cavity and heated to fuse the beads and provide a foam pattern which is identical in configuration to the metal part to be ultimately cast.

REFERENCES:
patent: 4726412 (1988-02-01), Magnan et al.
patent: 4844144 (1989-07-01), Murphy et al.
patent: 5119882 (1992-06-01), Corbett

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