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AssigneeFerromatik Milacron Maschinenbau GmbH
InventorsChristoph Jaroschek, Karl-Heinz Bourdon
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An electric drive with hydraulic assist is disclosed for use in an injection molding machine, especially for screw advance during the injection process and/or in the dwell pressure phase. An electric motor is primarily used to produce the axial advance of the injection screw via an appropriate gear train. A piston that is moveable in a cylinder through pressure provided by a hydraulic fluid reservoir, can be used to supplement the axial movement produced by the electric motor. It is proposed according to the invention that pressurization occurs via the hydraulic fluid reservoir upon reaching a defined control quantity which corresponds to a defined load condition on the electric motor, such that the pressure rise in the cylinder is proportional to the load on the electric motor.
An electric drive with hydraulic assist for moving a melting and injection screw in an injection molding machine, including an electric motor that produces axial advance movement of the screw via an appropriate gear train, and a piston that can be moved in a cylinder by pressure from a hydraulic fluid reservoir, wherein the movement of the piston can be used to supplement the axial movement created by the electric motor, characterized in that pressurization of the cylinder (13) by the hydraulic fluid reservoir (15) occurs upon reaching a defined control quantity that corresponds to a defined load condition on the electric motor (9) in which the pressure rise in cylinder (13) is proportional to the load of electric motor (9).
Dependencies are inferred from the claim text.