Patent ID: 6871688
Filing Date: 2005-03-29
Classification: B22D

Abstract:
1. A method for manufacturing a die-cast product, which includes a cast hole, the method comprising: driving a core pin in an inserting direction until the core pin reaches an insertable limit position to insert the core pin into a cavity of a die arrangement by supplying working fluid into a second fluid chamber of a driving means while draining working fluid from a first fluid chamber of the driving means, wherein the driving of the core pin in the inserting direction includes monitoring a fluid pressure of the first fluid chamber, which acts as a back pressure, during the driving of the core pin in the inserting direction, and the monitoring of the fluid pressure of the first fluid chamber includes stopping of the core pin when the monitored fluid pressure of the first fluid chamber exhibits abnormal behavior that is different from normal behavior exhibited in a normal operation; injecting a molten material from an injecting means into the cavity; solidifying the molten material received in the cavity to form the die-cast product; driving the core pin in a retracting direction until the core pin reaches a retractable limit position to remove the core pin from the cavity; and removing the die-cast product from the cavity.