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Higher performance and dynamism for the Allrounder A
Hybrid drive: Hydraulic injection moulding on the Allrounder 570 A
New features of the Allrounder A electric machine series were first presented at the K 2007, for example the new larger 520 A machine size, the increased installation dimensions for larger and more complex moulds, the new, small size 70 injection unit for the production of small and micro-components, or the "Selogica direct" control system with touchscreen, which is available as an alternative option at no extra cost.
Now, just six months later, there is yet another innovation: the Allrounder 570 A with a hydraulically actuated injection axis. Like many extensions and refinements to the Arburg range, this development was largely brought about in response to customer requests. The high injection speeds that can be achieved also yield a higher injection performance, something that is necessary for some important areas of application.
High performance for high-performance applications
The levels of material throughput attainable through the high plasticising capability enable fast cycles to be achieved. This can be advantageous in the field of multi-cavity applications, for example, as well as for the packaging sector or thin-walled applications. On the electric Allrounder A, the hydraulic injection axis is moved by means of more powerful accumulator-driven hydraulics, which have also been used to date for the optionally available hydraulic "Ejector", "Nozzle" and "Core Pull" auxiliary axes. This new injection-side enhancement effectively increases the range of applications of the Allrounder 570 A in the high performance sector. However, the machine still remains energy efficient, thanks to the other electric movement axes, for example on the clamping side.
The machine, which was on show during the Technology Days 2008, produced screw caps from HDPE weighing 2.7 grams in a 24-cavity mould in a cycle time of only 4.5 seconds.
Modular system with four sizes
A principle feature of the electric Allrounder A, which is available in the four sizes 370 A, 470 A, 520 A and 570 A, with clamping forces ranging from 500 to 2,000 kN, is its cost efficiency. The main axes, with servo-electric drive as standard, allow for simultaneous movements and consequently for short cycle times. The auxiliary axes can be driven electrically or hydraulically, depending on the customer's requirements. A further advantage of these electric machines is their low energy consumption which, depending on the application, can be up to 40 % lower than with a comparable hydraulic machine. Accordingly, in future, the Alldrive machines will carry the new Arburg energy efficiency label "e²"
High reproducibility and part quality are guaranteed by the excellent positioning accuracy of the electric movement axes, which also contribute to reduced noise emission levels. Thanks to the accuracy of the axis movements, simultaneous entry into the mould can be performed quickly and precisely in order to optimise cycle times.
Even greater modularity
Thanks to hydraulic injection with the 1300 size injection unit by means of accumulator-driven hydraulics on the Allrounder 570 A, customers now have more choice when it comes to the configuration of the Allrounder A machine series, enabling them to tailor the machines precisely to their specific applications. This means that the Allrounder 570 A can also be used for applications whose performance requirements exceed the capabilities of the largest electric, size 800, injection unit .
This modular system allows the highest-performance, most cost-efficient machine to be configured for each application.
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