| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide technology for easily taking out a core forming a cavity part having an opening area to be opened by opening of a cast product and an interference area having a part of the cast product in the taking-out direction of the core. Ž<P>SOLUTION: The core 10 is provided with a first core member 12, a second core member 14, and a third core member 16. The first core member 12 forms at least the interference area 5b below bridges 9. The second core member 14 is slidably connected with the first core member 12 to form the opening area 5a. The third core member 16 is slidably connected with the second core member 14 to form the opening area 5a. The third core member 16 is made to slide relative to the second core member 14 and the second core member 14 is made to slide relative to the first core member 12 so that the first core member 12 is made to be movable from the interference area 5b to the opening area 5a. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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