| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot runner-valve gate die in which the gate treatment face of a molding is made to such a smooth face that the remainder of a gate and a burr do not remain and the molding free from residual stress is obtained. SOLUTION: The hot runner-valve gate die is equipped with a valve pin 17 which opens and closes a gate hole 16 of the body 15 of a nozzle opened in the molding part 14 of a product by means of movement in the axial direction. Injection and filling of molten resin 21 into the molding part 14 of the product is controlled by opening, closing and driving the valve pin 17 by using oil pressure as a driving source. The hot runner-valve gate die is equipped with a high-speed changeover valve 12 which vibrates the valve pin 17 in the axial direction. The valve pin 17 is formed so as to be transferred from an opened state to a closed state while being vibrated by the high-speed changeover valve 12. Since the valve pin 17 surely reaches the inside of the gate hole 16 and closes it, the remainder of a gate and a burr do not remain on the gate treatment face of a molding 1 and the gate treatment face is finished into a smooth face.
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