| 摘要 |
This invention discloses a method of improving the die casting process by the application of the inventor's mathematics and physics stored in a computer to control the injection speed and the timing of the excitation of an intensifier. Using either data from a die surface temperature for a selected location detected by a pyrometer, the last instant before the die is closed, or the alloy-die interface boundary data from a thermocouple, the inventor's equations loaded in a computer calculate and graph the solidification pattern for the casting wall and the quantity of heat remaining in the alloy wall vs. time above the dynamic solidus thereby establishing parameters for control of facets of the injection phase. The unique properties of the boundary's transient temperature during solidification have been shown by the inventor's mathematics to be of vital import to the determination of the solidification pattern used to control injection. The transient boundary temperature can be determined by either the inventor's equations or by the varying output of the die surface mounted thermocouple with the thermocouple being preferred. A typical injection pressure time graph is plotted in the computer software program from a pressure transducer in the hydraulic injection system for comparison with the solidification pattern for control of the fill time, somewhat automatic as the most desirable method.
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