Injection Device of an Injection Molding Machine and Method for the Operation Thereof
AssigneeSiemens Aktiengesellschaft
InventorsThomas Budde, Ingo Geier, Klaus Oberndorfer
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Abstract
There is described a device and a method for operating an injection device for an injection molding machine which is provided with an extruder screw that is driven by an electric machine. Acceleration values and/or values depending on an operating point of the electric machine are used for calculating an injection pressure and/or a ram pressure, thus dispensing with the need for a pressure sensor.
Claims18
1-10. (canceled)
A method for operating an injection device for an injection molding machine, comprising:
- providing an extruder screw driven based upon an electrical machine;
- calculating a pressure based upon acceleration values and/or values dependent on an operating point of the electrical machine.
The method as claimed in 11, wherein a friction characteristic of the extruder screw is used for calculating a injection pressure.
The method as claimed in 11, wherein a friction characteristic of the extruder screw is used for calculating a dynamic pressure.
An injection device, comprising:
- a closed-loop control device;
- operating point dependent values of a torque constant of an electrical machine stored in a memory;
- and
- a calculated injection pressure, calculated based upon the operating point dependent values, wherein the calculated injection pressure replaces a measurement of an actual injection pressure value, wherein a injection molding machine having the injection device lacks a pressure measuring device.
An injection device, comprising:
- a closed-loop control device;
- operating point dependent values of a torque constant of an electrical machine stored in a memory, the operating point dependent values being used in particular for calculating an injection pressure and a dynamic pressure.
Dependencies are inferred from the claim text.