| 摘要 |
The present invention relates to an injection mold having a plurality of shrinkable and expandable undercut molding cores and, more specifically, to an injection mold having a plurality of shrinkable and expandable undercut molding cores, which is easy to extract a molded product formed with an undercut inside, and has effects in preventing the change or the scratch of the shape of the molded product. The injection mold of the present invention comprises: a lower mold (10) formed with an injection hole (12); a stripper mold (20) formed with a protrusion (21) on the lower side of the inner circumferential surface; an upper mold (30) constituted of a first upper mold (31), a second upper mold (32), and a third upper mold (33); an operation mold (40) installed inside the upper mold (30); a core mold (50) formed with a mounting protrusion (52) on the outer circumferential surface; and an undercut molding core (60) shrunk and expanded by the up and down motion of the operation mold (40). |
