Originally Published EMDM January/February 2002
MOULDING EQUIPMENT
Hybrid moulding machine bridges electric-hydraulic divide
As the electric versus hydraulic debate rages on, Arburg GmbH + Co. (Lossburg, Germany) hopes to achieve a consensus opinion with the introduction of a new generation of machines equipped with both electromechanical and hydraulic axes. The company launched the first machine in the new Alldrive series at K 2001: the Allrounder A has an 800-kN clamping force and 420 x 420-mm clamping dimension. At the show, the machine was fitted with a 72-cavity hot-runner mould to produce a needle clamp.
"All-electric machines drive up capital equipment costs, and they simply are not necessary for many applications," says company spokeswoman Susanne Wurst. "If clamping force is what matters to you, then an all-electric machine is not required." But if you do want an electric moulder, Arburg offers the best of both worlds with its hybrid machines, she adds.
Blending electrically driven main axes and combinable hydraulic and servoelectric auxiliary axes provides sufficient hydraulic force and ensures electromechanical accuracy, according to Wurst. The system's flexibility allows the user to optimize cost-benefit ratios while adapting to changing production requirements.
The Allrounder A on display at the K 2001 show operated with a 35-series cylinder module and was equipped with a new electrically driven five-point toggle joint to enhance positioning accuracy. The nozzle contact force is generated hydraulically.
Currently, the 800-kN unit is the only model available in the Allrounder A series. "We wanted to start with a mid-range clamping force," says Wurst, "but as needs arise and we receive customer requests, we will develop other sizes."
Norbert Sparrow
Copyright ©2002 European Medical Device Manufacturer
