PROBLEM TO BE SOLVED: To provide the improvement of a technique for present investment casting, in which though the research as the most important to the investment casting for turbine engine parts, such as blade, airfoil, is considerably progressed, in this technique, much room of the improvement remains.;SOLUTION: A layer 70 of wax or the similar material, is formed on a shell-fixed tool of the investment casting. This layer 70 is improved to the stability to the fixing of a pattern 22, or the precision of the surface formation of the shell 24.;COPYRIGHT: (C)2006,JPO&NCIPI
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