| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold for injection molding capable of obtaining a molding having more uniform density, small warp, deformation, residual distortion or the like, no shrinkage unevenness, a high accuracy dimension, a high appearance or high transferability or the like by simplifying a mechanism or a structure and reducing in size. SOLUTION: The mold for injection molding a cylindrical object comprises a movable mold having a movable mold body and a core provided integrally with the body, and a fixed mold closed with the movable mold and having a cavity formed between the fixed mold and the core and corresponding to the molding. In this case, the core is eccentrically movable while holding at a central axis of the core in a parallel state to a central axis of the molding molded in the cavity and rotatable around the central axis of the cavity while holding an eccentric state. The core has a cylindrical core body contacted with the molding and a shaft for rotatably supporting the body around its central axis via a rolling bearing. |
