| 摘要 |
PURPOSE:To make arrangement of a fluid casting route easy, by a method wherein a fluid casting route casting a fluid for hollow part molding into resin within a cavity is provided within a pushing-up pin extruding a molding outside, which is integrated and the diameter of a fluid casting port is made into a range of a specific diameter. CONSTITUTION:For example, two pushing-up pins 1 are provided by penetrating through the inside of a movable mold 93, the inside of which is made into a fluid casting route 10 in a state of a hollow and the top of a tip part 11 is arranged so that the same becomes flush with a mold surface 935 of the movable mold 93. A fluid casting port 101 is opened into the tip part 11 and the diameter of the port 101 is made into 0.02-0.2mm. A base end part 12 of the pushing-up pin 1 is connected with a pressurized nitrogen gas source and a pushing-up plate 94 is connected with the vicinity of the base end part 12. At a point of time when resin is injected within a cavity 90 and the resin is positioned more outside than the fluid casting port 101, a hollow molding is manufactured by casting the nitrogen gas 85 through the fluid casting port 101. When the diameter of the fluid casting port 101 exceeds 0.2mm, it is feared that the resin injected within the cavity enters into the fluid casting route through the fluid casting port. |
