Patent ID: 6247521
Filing Date: 2001-06-19
Classification: B22D

Abstract:
A method of manufacturing a cast product using a casting machine,said casting machine including: a holding furnace that stores melt; a mold with a cavity formed in its interior; a melt duct that interconnects the holding furnace and the cavity; and a device that generates a pressure difference between the pressure inside the holding furnace and the pressure inside the cavity; and wherein said cavity is filled by the melt stored in said holding furnace via said melt duct due to the pressure difference,the method comprising the steps of:providing a pressure difference control program defining a pattern of pressure difference increase rate target values, each pressure difference increase rate target value being associated with a target time period;applying a first selected pressure difference increase rate target value to the melt stored in the holding furnace for a first target time period;detecting an actual time period in which the melt moves from a first predetermined level inside the casting machine to a second predetermined level inside the casting machine as a result of applying the first selected pressure difference increase rate target value to the melt; andreplacing the first target time period stored in the control program with the actual time period detected in the detecting step.