Elastomeric mold lining for making wax replica of complex part to be cast

Claim 1

In the process of casting a wax replica of a warped body having fine surface detail thereover for the preparation of a ceramic shell mold of the warped body, the improvement comprising the steps of: a. employing a separable mold having an oversized cavity relative to the body of which the wax replica is to be prepared, b. locating in said cavity spaced from the walls thereof a master identical in shape and outer surface detail to said body, c. disposing a material that is heat-curable to a solid elastic state in the space between said master and the walls of said cavity, d. enclosing said master and said heat-curable material within said mold, e. curing said heat-curable material, f. opening said mold and removing said master and the threedimensional cured elastomeric body formed thereover, g. separating said master and said elastomeric body, h. replacing said elastomeric body in said cavity as a liner therefor, i. closing said mold, j. introducing molten wax under pressure into the lined cavity, k. opening said mold, l. removing the solidified wax replica and the surrounding elastomeric body and m. separating said wax replica and elastomeric body.