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US 5,911,924 AGranted
Process for injection molding machine with electric drives
AssigneeProcontrol, Inc.
InventorsRonald Siegrist, Bruno Stillhard, Hugo Blochlinger
Life of this patent
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AssigneeProcontrol, Inc.
InventorsRonald Siegrist, Bruno Stillhard, Hugo Blochlinger
Estimating the term…
A method is disclosed for controlling an injection molding machine of the type having an injection screw drivable for axial movement within an extrusion cylinder by a drive-controlled servo motor through a mechanical transmission, to provide a filling phase, a dwell phase, and a plasticization phase, the servo motor having a velocity command signal input connection, and the molding machine having sensors for screw position and injection pressure. The method includes the steps of presetting desired values for at least one of the injection pressure and the screw position; sensing the respective one of the corresponding actual injection pressure and actual screw position; and transmitting non-zero velocity command signals to the drive-controlled servo motor during at least the plasticization phase, and preferably also the filling and dwell phases, to move the injection screw within the cylinder. The velocity command signals are calculated as a function of a deviation of the respective one of the actual injection pressure and the actual screw position from the respective preset desired value, preferably using a linear functional relation during small deviation values, and a non-linear functional relation for large deviation values, to improve stability.
A method of controlling an injection molding machine having a filling phase, a dwell phase, and a plasticization phase, the injection molding machine having an injection screw drivable for axial movement within an extrusion cylinder by a drive-controlled servo motor through a mechanical transmission, the servo motor having a velocity command signal input connection different from a torque command signal input connection, means for sensing at least one of screw position, and injection pressure, the method comprising the steps of:
A method of controlling an injection molding machine having a filling phase, a dwell phase, and a plasticization phase, the injection molding machine having an injection screw drivable for axial movement within an extrusion cylinder by a drive-controlled electric motor through a mechanical transmission, the electric motor having a velocity command signal input connection different from a torque command signal input connection, means for sensing at least one of screw position and injection pressure, the method comprising the steps of:
Dependencies are inferred from the claim text.