MANUFACTURE OF LOST FOAM PATTERN MOLD FOR CASTING

摘要

PURPOSE: To simplify a metallic mold for foam formation and to enable the cost down because it is unnecessary to arrange a device of pressurizing device, etc., as the ordinary method in order to keep the inner wall surface shape in a hollow forming product. ;CONSTITUTION: The hollow forming product 4 having the hollow part 4a is fitted to a cavity 3. Successively, pre-foam particles 5 are packed into the cavity 3 and heated and foamed to form the foamed forming material 5, and at the same time, the foam resin forming material 5' and the hollow forming product 4 are integratively formed. Then, by filling non-compressive medium 6 of sand, etc., providing refractoriness into the hollow part 4a, the shape of the hollow part 4a is kept and integratively formed.;COPYRIGHT: (C)1993,JPO&Japio