Method of controlling injection molding machine with hydraulic loads
First Claim
1. A method of controlling hydraulic drives of an injection molding machine for manufacturing plastic moldings, said machine comprising a plurality of hydraulic loads for individual subassemblies including a closing unit, an injection unit, an ejector and cores, said method comprising the steps of:
- detecting a measured value of a parameter at a subassembly;
comparing said measured value with a desired value of said parameter;
converting any difference deviation resulting from said comparing between said measured value and said desired value of said parameter into a desired velocity value; and
adjusting a rotational speed of a motor, in response to said desired velocity value input into a servodrive apparatus associated with said motor, said motor controlling said hydraulic loads, to obtain said desired value of said parameter at said subassembly.
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0 Petitions
Accused Products
Abstract
An injection molding machine for manufacturing plastic moldings contains a plurality of hydraulic loads for individual subassemblies including a closing unit, an injection unit, an ejector and cores. A plurality of the pumps are respectively connected to the hydraulic loads. At least one alternating-current servomotor is provided for driving the pumps. In a method of controlling hydraulic drives of the foregoing machine, the measured value of a subassembly is detected and compared with a desired value; any deviation detected thereby is converted into a desired velocity value. The speed of rotation of an associated motor is then adjusted, via a servodrive module, in response to the mentioned desired velocity value.
23 Citations
3 Claims
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1. A method of controlling hydraulic drives of an injection molding machine for manufacturing plastic moldings, said machine comprising a plurality of hydraulic loads for individual subassemblies including a closing unit, an injection unit, an ejector and cores, said method comprising the steps of:
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detecting a measured value of a parameter at a subassembly; comparing said measured value with a desired value of said parameter; converting any difference deviation resulting from said comparing between said measured value and said desired value of said parameter into a desired velocity value; and adjusting a rotational speed of a motor, in response to said desired velocity value input into a servodrive apparatus associated with said motor, said motor controlling said hydraulic loads, to obtain said desired value of said parameter at said subassembly. - View Dependent Claims (2, 3)
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Specification