| 摘要 |
The present invention relates to a molding having an under-cut forming structure using an under-cut formed ring and an air injecting pipe, and more specifically, to a molding having an under-cut forming structure using an under-cut formed ring and an air injecting pipe, comprising: a lower portion molding (10) having a first cooling water passage (11); an upper portion molding (20) mounted on an upper portion of the lower portion molding (10), and having a protrusion (21) at an inner surface of a lower end; and a core molding (30) inserted and installed inside the lower portion molding (10) and the upper portion molding (20), and having a second cooling water passage (31). |
