Investment casting of turbine blades6/15/2023 ![]() To make parts, the mold cavity is filled with molten metal that is allowed to solidify. Following this the mold is usually placed in a second oven to cure for 12 to 24 hours. The completed mold is placed in an oven and the wax removed by melting and evaporation. A metal hollow tube is now placed over the wax patterns and a slurry-such as plaster of Paris-is poured to entirely cover the patterns. If the production volume is large enough several wax patterns are attached to a tree that contains the runners, gates, and other features that will feed and distribute the molten metal. The wax pattern is removed from the mold and attached to a wax base that contains a gate. The external shape of the wax pattern resembles the internal shape of the mold. After the mold is formed, wax is injected to form a pattern.
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