| 摘要 |
An adaptive controller (42) is provided for controlling the transition, in an injection molding apparatus (10), from the injection stage to the packing stage. The controller operates by controlling the velocity of the ram (32) during the injection stage, and controlling the ram pressure during the packing stage. The controller (42) anticipates the transition from the injection stage to the packing stage by monitoring the ratio of pressure to velocity. The divergence of this ratio forecasts the onset of the packing stage. At this time, a pressure relief valve (46) is preset in anticipation of the packing stage, to prevent a pressure spike during the transition period. The flow control valve (40) is held constant during the transition.
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