Back to results
US 4,050,500 AGranted
Method of making a shell mold
AssigneeEaton Corporation
InventorJack T. Steinbacher
Life of this patent
Estimating the term…
Abstract
A stronger, thinner shell mold suitable for making cast metal parts comprises a base member of resin bonded sand and a second surfacing layer of a cured thermosetting binder material. Also disclosed is a method for forming the new shell mold.
Claims4
A method of making a thin reinforced shell mold from a resin-coated sand comprising the steps of:
- A. investing a heated pattern with a mixture of sand and thermal setting resin to coat the heated pattern;
- B. heating the coated pattern to cure the resin forming a base layer for the shell mold, the interior surfaces of the base layer being adapted to receive molten metal for forming a cast article;
- C. applying a thin coating of a solution of inorganic silicate and a wetting agent to the external surfaces of the base layer opposite the internal surfaces, the material penetrating at least a portion of the base layer;
- and
- D. curing the inorganic silicate to form a reinforced thin shell mold.
2 more elements
Dependencies are inferred from the claim text.