PROCESS FOR PRODUCING COMPOSITE MOLDING

摘要

A process for producing a composite molding comprising one or more thermoplastic resins selected between a polyarylene sulfide resin and a polyamide resin and a metallic part and stably having satisfactory adhesion. A reduction in molding cycle time can be attained in the process. The process is characterized in that (1) a mold is used which is divided into a main mold for controlling linkage with a molding machine and a core which has a circuit for heating and a circuit for cooling and involves inside an area where the one or more resins come into contact with a metallic part. The process is further characterized in that (2) that part of the mold which comes into contact with the resin(s) flowing in during molding has been surface-treated so as to have a ten-point average roughness (Rz) of 0.5 µm or less, and the core has a capacity of 60 cm3 or less and has been embedded in the main mold, with that peripheral part of the core which is in contact with the main mold having been heat-insulated. The process is furthermore characterized by (3) setting the metallic part in the mold, heating the core to a temperature in a specific range, injecting the resin(s) to fill the cavity therewith while keeping that temperature of the core, and immediately after completion of the filling of the mold cavity with the resin(s), blocking the heating circuit of the core and rapidly cooling the core with the cooling circuit of the core at a cooling rate of 7 °C/sec or higher.