Andreas Plöckinger, Bernd Winkler, Paul Foschum,
"Energy efficient digital hydraulics addon for acomposite press in series production"
: Proceedings of the 12th Workshop on Digital Fluid Power, DFP24, June 6-7, 2024, Tampere, Finland, Seite(n) 68-77, 6-2024
Original Titel:
Energy efficient digital hydraulics addon for acomposite press in series production
Sprache des Titels:
Englisch
Original Buchtitel:
Proceedings of the 12th Workshop on Digital Fluid Power, DFP24, June 6-7, 2024, Tampere, Finland
Original Kurzfassung:
Since more than 10 years the Linz Center of Mechatronics GmbH (LCM) demonstrates that digital hydraulics is a promising solution for different drive challenges and can be used either for industrial or mobile application with several implemented setups. Because LCM uses mainly leak-free seat type valves for its digital hydraulic concepts instead of highly leaking control spool type valves a remarkable reduction of energy consumption is given. Digital hydraulics is an outstanding solution when a specific cylinder position, or several discrete positions, need to be controlled with high precision over a certain time span. While accuracies of less than one micrometre can be achieved, the energy consumption is reduced to a minimum. In combination with the high robustness of a hydraulic cylinder, this solution is far superior to an lectromechanical one. This paper is about a digital hydraulic control solution for composite presses. Originally the pressure during the pressing cycle was open loop controlled via a variable displacement pump. For the customers? composite products long pressing cycles of around 3 minutes at highly accurate controlled pressures of about 250bar are required. LCM implemented a digital pressure control (DPC) piggyback system to control a constant pressure by two additional digital seat type valves using the energy stored in a small additional hydraulic accumulator. The main hydraulic system can therefore be set into an idle mode or even be switched off completely during the pressing cycle, what leads to a significant reduction of energy consumption. The unit can also be used to be applied at other applications to control position, force or momentum. Today, no ?out of the box? solution can be found on the market. LCM therefore presents a complete package containing digital hydraulics, electronics and control, the so called Digital Hydraulic Control Unit (DHCU).
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