Control method of injection molding and control apparatus of injection molding
AssigneeSony Corporation
InventorIkuo Koumaru
Life of this patent
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Abstract
A control method of injection molding includes the steps of: filling molten resin in an injection molding die by velocity control until a detection value of a filling pressure of the molten resin reaches a first set pressure value; filling the molten resin by switching control from the velocity control to pressure control by which the control is performed at the first set pressure value at a time point when the detection value of the filling pressure reaches or exceeds the first set pressure value; and switching the control to holding pressure control by which the control is performed at a second set pressure value at a time point when the filling velocity drops to or below a set velocity while filling is performed by the pressure control.
Claims13
A control method of injection molding comprising the steps of:
- filling molten resin in an injection molding die by velocity control until a detection value of a filling pressure of the molten resin reaches a first set pressure value;
- filling the molten resin by switching control from the velocity control to pressure control by which the control is performed at the first set pressure value at a point in time when the detection value of the filling pressure reaches or exceeds the first set pressure value;
- and
- switching the control to holding pressure control by which the control is performed at a second set pressure value at a point in time when the filling velocity drops to or below a set velocity while filling is performed by the pressure control.
A control apparatus of injection molding comprising:
- a pressure detection portion that detects a filling pressure of resin being filled in an injection molding die;
- a velocity detection portion that detects a filling velocity of the resin;
- and
- a filling control portion that fills molten resin by velocity control according to a velocity detected by the velocity detection portion until the filling pressure of the molten resin detected by the pressure detection portion reaches a first set pressure value, switches control from the velocity control to pressure control by which the control is performed at the first set pressure value at a point in time when a detection value of the filling pressure detected by the pressure detection portion reaches or exceeds the first set pressure value, and switches the control to holding pressure control by which the control is performed at a second set pressure value at a point in time when the filling velocity detected by the velocity detection portion drops to or below a set velocity while filling is performed by the pressure control.
Dependencies are inferred from the claim text.