Composite-molding method and injection-molding machine of different material resin

Abstract

The present invention has an object of eliminating the holding pin trace of a composite-mold of the dichromatic molding by refilling with resin by the pushing pin and preventing the lateral-shift of the primary mold during the refilling. It is made possible to fill closed recess and cavity with resin through a communicating hole formed in the primary mold by the pushing pin. A primary cavity die 11 and a secondary cavity die 12 are juxtaposed at symmetrical positions of a fixed plate 1. Core dies 14 closing alternately with both thereof are juxtaposed on a rotary table 7 installed on a movable platen 4. Holding pins 15 of the primary mold 30 and a resin pushing pin 16 are installed in the core die 14 in a way to appear and disappear in respect to a cavity. The primary mold 30 is held in contact with the secondary cavity die surface by the holding pin 15. A pin hole 20 of resin for refilling is formed to be opened on a core die surface by retracting the pushing pin 16. A secondary cavity including the pin hole 20 is refilled with a different material resin by injection. The holding pin 15 is retracted and sunk in the cavity die surface. The pushing pin 16 is moved forward to force the resin for refilling the pin hole 20 into the resin in the cavity. The regions not filled with resin due to the holding pin 15 are refilled up.

Dependencies are inferred from the claim text.