PURPOSE: To conduct both drawing and injection molding in one process to obtain a composite body having a good interlayer adhesion without an occurrence of wrinkle or breakage by a method wherein after a composite sheet of a metallic sheet material and a thermoplastic resin is pressed against a fixed mold by a ring piece, a resin is injected into a cavity, and a movable mold having a curved surface is closed while the pressing force of the ring piece is controlled.
CONSTITUTION: A composite sheet 16 in use is obtained by laminating a thermoplastic resin 20-500μm thick on at least one surface of a metallic sheet material 30-600μm thick. It is preferable that the thermally deforming temperature of the resin to be laminated on the opposite side of a resin injecting side is equal to or higher than that of an injecting resin. An air cylinder 11 is provided in a movable mold plate 8 of a mold. A ring piece 13 is fixed to the top end of a piston. Before a convex surface of a movable mold plate 10 abuts on the sheet 16 after the start of clamping, the sheet 16 is clamped between the ring piece 13 and a cavity block mold plate 6. The mold is closed until a compression zone remains while the clamping force is controlled. Next, the resin is injected, thereafter being compressed while the clamping force of the ring piece 13 is controlled.
MORITA YOSHITOMO
YASUDA ATSUSHI
