MANUFACTURING METHOD FOR MOLDING AND VALVE GATE MOLD DEVICE USED FOR THIS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To obtain a molding of high precision and high quality by uniformly filling a product cavity with a molding material when the molding with a porous part is manufactured, and dispense with the after-treatment of a gate part. SOLUTION: A valve sleeve 56 which opens/closes a gate 35 is provided on the fixed mold half 21 side and a core pin 81 provided on the movable mold half 22 side is fitted into a valve sleeve 56 when the mold is clamped. Thus a cylindrical gate 35 which is opened at a position corresponding to the periphery of the porous part of the molding is formed to the product cavity 23. Thus the axial deviation of the valve sleeve 56 resisting a resin pressure or the like is prevented from occurring by fitting the core pin 81 into the valve sleeve 56.