| 摘要 |
PURPOSE:To enable a helix to be manufactured highly efficiently and accurately through Injection molding without the need of a cutting a flash removing process or the like by attaching shaft pins to the side end mold and shaft securing part of an extruding mold respectively in use; of a molding apparatus, and thereafter forming a helix through molding of a plastic. CONSTITUTION:By separating outside molds 28, 28', a side end mold 12 is isolated from a peripheral surface mold 11 so as to release the tip end of the peripheral surface mold 11, and by operating an actuator 25. an extruding mold 13 is kept in a state where it is pushed into the recession in the peripheral surface mold 11. By keeping this state, a shaft pin 4 is fitted In the shaft securing part of the extruding mold 13 tip end. Next, by operating the actuator 25, the extruding mold 13 Is extracted In order for withdrawing the tip end surface to the side end part 15 position of the peripheral surface mold 11. In addition, a shaft pin 4 is fitted in the shaft securing part of the side end mold 12, and a screw of a retaining mechanism 18 is tightened for fastening the shaft pin 4. Then, the side end mold 12 is joined to the peripheral surface mold 11, and further the outside molds 28, 28' are joined thereto. At this time, the injection passage 22 of the side end mold 12 is connected to the injection passage 29 of the outside mold 28. In this state a plastic is injected for molding a shaft body 2. |
