| 摘要 |
Apparatus is provided for molding ceramic cores and patterns to be used for investment casting of blades or vanes for a jet engine, turbine or the like, and having shapes to provide a strong structure with internal passages permitting the flow of a cooling medium. This invention provides a mold having upper and lower mold portions having parting lines in a general horizontal direction. The molded shapes have formations whose surfaces require molding shapes which require withdrawal in lines normal with such surfaces. Such formations described herein relate to the forming of internal passages in the completed blade structure to permit the flow of a cooling medium. The present invention provides pairs of core-forming blocks movably mounted in the upper and lower mold portions and so constructed that after a shape is formed, the blocks may be withdrawn in lines normal with the formed surfaces. To take care of the irregular shapes of such blades or vanes some of these blocks are withdrawn at an angle to certain other of the blocks. The specification describes specifically a negative embodiment of the airfoil part wherein deformations for forming the internal passages in the airfoil part are inwardly turned from the general core surfaces by projections on the core-forming blocks. A second embodiment of a positive embodiment is briefly described as having internal passages in the airfoil part formed by deformations outwardly turned from the general core surfaces by recesses in the core-forming blocks.
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