Controlled wall casting process

Details Controlled wall casting process Controlled wall casting process

1988-10-12

1989-06-20

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Vacuum treatment of work

To degas or prevent gas entrapment

264221, 264225, 264226, 264227, 264275, B29C 3918

Patent

active

048407640

ABSTRACT:
A method for forming a cast replica of an article, including: forming an outer mold around the article with a first molding material, the outer mold having an inner surface substantially conforming to the outer surface of the article; separating the article from the outer mold; applying to the outer mold on its inner surface a predetermined thickness of a second molding material which is separable from the outer mold, the second molding material defining a hollow space at the interior thereof; filling the hollow space with a third molding material separable from the second molding material; allowing the third molding material to cure to form an inner mold; separating the second molding material from the outer mold and the inner mold; locating the inner mold or a reproduction thereof within the outer mold with a space between said outer mold and the inner mold representing the predetermined thickness; filling the space between the inner mold and the outer mold with a fourth molding material; allowing the fourth molding material to cure, forming the cast replica, and separating the cast replica from the outer mold.

REFERENCES:
patent: 2460242 (1949-01-01), Renaud
patent: 3548050 (1970-12-01), Mozer
patent: 4289724 (1981-09-01), Baynard
patent: 4650625 (1987-03-01), Pentlow

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