PURPOSE: To increase a limiting drawing ratio in the case of deep drawing by laminating a thermoplastic resin film at least on one surface of an aluminum foil, specifying a temperature of its flange and molding it.
CONSTITUTION: Thermoplastic resin such as biaxially stretched polypropylene film is laminated at least on one surface of a foil made of aluminum or aluminum alloy, and molded while holding a temperature of a flange at a temperature of a melting point or less of the resin and at least higher by 20°C than a temperature of a shoulder of a punch 3. A press used to deep drawing mold has a means 4 for heating a blank holder 1 and/or a die 2, and a cooling means 6 is provided to maintain punches 3, 3' at a lower temperature than that of the flange. Thus, a limiting drawing ratio can be increased.
ATSUMI TAKASHI
NISHIKAWA NAOKI
TAKEUCHI MASAKI
