| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for casting multiple screw-shaped parts with which the casting can easily be performed by drawing out a core pattern from the core of a screw part and the shortening of producing time can be obtained. SOLUTION: A screw part 3 is composed of: projecting parts 5a arranged at the top 5 of screw threads so that the outer diameter D of the screw threads becomes almost the same in the axial direction; and groove side inclining parts formed in the screw grooves 6 and having a prescribed draft angle in the axial direction. Further, divided cores 7A, 7B are individually molded by using divided core patterns 2A, 2B dividedly formed into at least two with the axial directional cross section, and the multiple screw-shaped parts, such as a female rotor 1, is cast by assembling these divided cores 7A, 7B. COPYRIGHT: (C)2005,JPO&NCIPI
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