| 摘要 |
PROBLEM TO BE SOLVED: To provide a metal mold for injection molding that can improve yield of materials and reduce its production time. SOLUTION: When the mold is closed, an ejector pin 15 is retracted by a return pin 24 and a valve pin 22 is raised by the operation of a cylinder 23 to completely shields a runner branch 26b. An injection process begins, and, when a melted resin fills the main part of the runner part 26 and reaches the outermost branches, a control signal triggers a valve system and it retracts the cylinder 23. A coil spring 25 pushes a upper valve plate 20 downward and the top of the valve pin 22 sinks in a movable mold plate 10, which allows the resin to flow together to every branch of the runner part 26, and to simultaneously flow through gates and fill plural cavities 14. Molded articles are taken out after dwelling and cooling processes, when the mold is opened at a parting line 1 and the articles attached to the movable plate 10 and stuck out by the action of an ejector pin 22 and then taken out.
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