| 摘要 |
PROBLEM TO BE SOLVED: To reduce warp and strain and, further, prevent flow marks, hesitation marks, etc., by constructing an outer peripheral portion of a movable side separately from an inside portion thereof, controlling an outside core of the movable side mold by a hydraulic cylinder, and making an inside core freely playable to embed elastic members therein. SOLUTION: A core plate 5 at an outer peripheral portion of a movable side mold and a core 7 at an inside portion thereof are provided on the movable side of the mold, and the core 7 is allowed to play, whereby a plurality of elastic members 8 such as springs are embedded between the core 7 and a back plate 9. A resin material is packed into a cavity through a hot runner 2 and a gate 3. At the time of the packing of the resin material, the core 7 is in an advanced state by means of the pressure regulating elastic members 8, and the balance between the injection pressure of the resin and the pressure of the pressure regulating elastic members is temporarily kept, thereby preventing the drooling of the molten resin. At the same time as the packing of the molten resin is finished, the gate 3 is closed to enter a secondary step of clamping a mold, and the molten resin in the cavity is compressed under pressure. |
