Method and device for controlling a linear motion axis
AssigneeNetstal-Maschinen AG
InventorMarkus Notz
Life of this patent
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Abstract
The invention relates to a method and device for controlling a linear motion axis, particularly of the injection screw (43) or a melt piston for an injection molding machine. Said device comprises a hydraulically driven piston (45) having a piston chamber (A) and a rod chamber (B). According to the solution proposed by the invention, at least one process phase is controlled/regulated by means of two parallel proportional valves, an injection valve (1) and a metering valve (2). The two proportional valves can be connected in parallel or in combination. The control/regulation of the driven piston (45) preferably uses digital technology. An enormous reduction in energy consumption and smooth transitions between the process phases are achieved with a hydraulic linear drive.
Claims22
-20. (canceled)
A method for controlling different process phases of an injection molding machine having an injection screw or a melt piston moved by a hydraulically linearly driven piston defining a piston chamber and a rod chamber, said different process phases including a metering phase, an injection phase and a dwell pressure phase, the method comprising the steps of
- controllably driving the piston by way of a proportional injection valve and a proportional metering valve, said proportional injection valve and said proportional metering valve switchably connected to operate in parallel or individually, and
- connecting the piston chamber and the rod chamber during the metering phase.
A device for controlling different process phases of an injection molding machine having an injection screw moved by a hydraulically linearly driven piston defining a piston chamber and a rod chamber, said different process phases including a metering phase, an injection phase and a dwell pressure phase, the device comprising:
- a proportional injection valve and a proportional metering valve connected to the piston chamber and the rod chamber, and
- a controller configured to control the proportional injection valve and the proportional metering valve individually or in parallel,
- wherein the piston chamber and the rod chamber are connected during the metering phase.
Dependencies are inferred from the claim text.