| 摘要 |
PURPOSE:To prevent lowering of strength at the weld line part, and render boring work unnecessary after molding by constituting the mold of the first mold cavity part for supplying a molding material at the same time of the part except a converging part, and the second mold cavity part having a molding material supplying gate other than the mold cavity part. CONSTITUTION:First, a stationary mold l and a movable mold 2 are closed and mold cavities 5, 6 are formed wherein a thermosetting resin molding material is supplied and molded at the first step. This cavity 6 is the mold cavity part for molding a thickness-directional half part of the weld line part, and it is formed such that a movable core 3 advances to a predetermined position by a fluid pressure cylinder 4. Besides, the first cavity part 6 is communicated with the mold cavity 5. In this state, a molten molding material is injected through a gate from the nozzle of an injection molding machine to the mold cavities 5, 6. Following this, after curing of the molding material, the fluid pressure cylinder is actuated in order to allow the movable core 3 to retreat to a predetermined position for forming the second mold cavity part 7, and a molten molding material is injected to the mold cavity part 7 from a gate 9 other than the one in a previous process. |
