| 摘要 |
PURPOSE:To enable to effect a full-automatic molding of a product having a screw part on an undercut surface thereof by a method wherein a rotary shaft having a screw core portion is enabled to be advanced or retreated as well as slided integrally while being rotated as it is guided by a slide core. CONSTITUTION:A slide core 20 is pushed by an inclined surface (shown by a two- dot chain line) of a fixed side nest plate immediately before finish of pouring resin while a rotary shaft 31 is pushed by an abutting surface 51a of a slide block 51 at an end part thereof. When the pouring is finished, a motor 45 is operated and the rotary shaft 31 is rotated. A screw core 30 and the rotary shaft 31 are retreated while being rotated by a screw bush 23 and are withdrawn from a molded product M. When the withdrawal of the screw 30a is finished, a mold is begun to be opened and the slide core 20 is retreated in cooperating therewith while the core part 20a for an undercut surface is withdrawn, thereby, sliding the rotary shaft 31 into a direction of a thrust. When the mold is opened further, an ejector pin ejects the molded product M to discharge it. |
