METALLIC MOLD APPARATUS AND METHOD FOR PRODUCING CYLINDER BLOCK

PROBLEM TO BE SOLVED: To form a columnar hole part by smoothly separating a core from a mold without providing a draft in a metallic mold provided with the core for forming the columnar hole in a casting. SOLUTION: A split core 16 is provided with: two first split cores 46 being tapered-shape at the tip end part, two second split cores 50 arranged between the respective first split cores 46: and an inner core 42 pushing the first split core 46 toward the direction that the first split core 46 is made away from the axial center. When the first split core 46 is positioned by pushing the inner core 42, both end parts of the second split core 50 are allowed to abut on the respective tip end parts of the adjacent first split cores 46, and the outer side surfaces 46a of the first split cores 46 and the outer side surfaces 50a of the second split cores 50 are formed of the columnar shape. The first split cores 46 and the second split cores 50 are drawn near toward the axial center C with first engaging pieces 67 and second engaging pieces 66 by drawing up the inner core 42. COPYRIGHT: (C)2006,JPO&NCIPI