Patent ID: 8828309

Claim:
An autoclave molding method for molding a composite material formed of a fiber substrate and a matrix of a thermosetting resin or a thermoplastic resin by placing the composite material in a vacuum bag and then in a molding chamber, and the heating and pressurizing the composite material, the method comprising: a step of supplying into the molding chamber saturated steam having a predetermined temperature and pressure needed for the composite material as a heating source and a predetermined pressurization source, a step of supplying into the molding chamber air, nitrogen or mixed gas having an ambient temperature and having a predetermined pressure higher than the saturated steam pressure as a supplemental superimposed pressurization source needed for molding, and a step of curing by controlling supply of the saturated steam, and the air, nitrogen or the mixed gas of these having the predetermined pressure, and controlling at least the temperature or the pressure so that the inside of the molding chamber can be maintained at the predetermined temperature and pressure needed for the composite material.