Method for positioning core by soluble wax in investment casting

Method of making an airfoil casting with internal air cooling passages comprising to form several individual bended channels

• Placing ceramic cores into a first mold cavity, the first mold cavity having two features, each one having several of grooves formed therein for each core element;
• Injecting fugitive material into the first mold cavity to make two fugitive segments about the ceramic cores, the fugitive material positioning multi ceramic cores,
• Placing the ceramic cores with the fugitive material segments into a second mold cavity, the second mold having a shape complementary to a desired final blade design, the fugitive material segments correctly positioning the ceramic cores in the second mold cavity,
• Injecting wax into the second mold cavity, the wax covering the fugitive material and several of the ceramic cores, solution of fugitive segments, forming a final pattern for shell making in investment casting,
• Melting the wax to leave a gap between the shell and the positioned ceramic cores therein;
• and casting molten metal into the gap to form the airfoil casting.