| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple and economical means for injection-molding a core part which constitutes the center of a cylindrical grinding whetstone. SOLUTION: A material for a core part 70 is injected into a molding cavity 48 formed of a first molding face 14 of a first molding half 12, a second molding face 18 of a second molding half 16, a cylindrical forming face 22 of a columnar molding half 20 and an inner peripheral face 72 of a cylindrical whetstone part 68. Consequently, it is possible to best-suitably injection-mold the core part 70 with a center hole 66 on the inner peripheral side of the cylindrical whetstone part 68. Further, when the core part 70 is injection-molded on the inner peripheral side of the cylindrical whetstone part 68 having a varying peripheral diameter, individually different molds need not be prepared. Thus the mold 10 for injection molding which is simple and economical for injection- molding the core part 70 constituting the center of a cylindrical grinding whetstone 60, 80 or 90, and the injection-molding method are provided. COPYRIGHT: (C)2003,JPO |
