German firm Bosch Rexroth has underlined its intelligent drive technology in hybrid injection moulding machines – the workhorses of the plastics industry which cover the almost infinite range of plastic products, from simple standard applications to large-area multi-component structural parts.

Hydraulic core, electric clamping, hydraulic injection and electric ejector: the possible combinations for hybrid injection moulding machines open up new degrees of design flexibility. Rexroth, the manufacturer of all drive and control technology, creates the ideal conditions for this, namely a control system optimised for the specific characteristics of both drive technologies and a wide range of scaleable hydraulic and electric actuators.

IndraMotion logic control for hydraulic drives supports all conceivable concepts for centralised and decentralised architecture for mixed operation. Here, it guarantees consistent real-time communications with all electric and hydraulic drive systems, even in decentralised concepts. Intelligent motion controls regulate their motion profiles with maximum dynamics and precision, regardless of the technology concerned. Rexroth thus creates the basis for a new dimension in modularisation of machine concepts.

In contrast to unregulated pump drives, the Sytronix variable-speed pump drive functions strictly as need-oriented. Integrated automation, higher dynamics, and a high degree of accuracy: Servo variable pump drives combine the ability for highest performance with clearly lower energy consumption and noise emissions in plastics machinery. Sytronix DFEn 5000 builds on the proven DFE control system, and reduces the losses caused by pressure locking during break times and with partial-load operations.

Through an acceleration of axes twice as fast (compared to variable pumps), Sytronix SvP 7000 increases the dynamics of plastics machines, and thus shortens the cycle times for higher productivity.

The digital pressure control provides a higher repeat accuracy and a stable zero point. Pressure dependent leakage losses are compensated. Within the pressure control, very short pressure change periods are possible, depending on the available oil volume. The high dynamics range and the ingenious control concept enable very precise controls. The precise control minimises overshoots and undershoots. In addition, a special function avoids cavitations when starting to lower the pressure.