In an effort to improve the repeatability and reduce the set-up time of its tube endforming machines, Eagle Precision turned to Rexroth Hydraulics to provide advanced proportional control technology on its latest machine.
The new Eagle NC IO/IO side-tank machine is based on the company’s single headed model but with increased tube capacity to 82.5mm OD, an improved menu driven control panel and up to the minute electro hydraulic technology developed by Rexroth and siemens.
Rexroth supplied Type 4WREE proportional valves, for controlling the direction and position of hydraulically powered actuators, other directional valves for auxiliary functions and tandem Type PV7 vane pumps with high/low pressure compensators, for coupling to an electric motor.
The machine incorporates a ‘quick set’ mode, which automatically adjusts the tooling set-up in accordance with stored data, and a ‘teach to master part’ function which copies a master component without damaging or altering its shape and form. As a result, set up times are reduced and job to job repeatability is enhanced, with data storage for between 50 and 250 individual components.
The machine’s hydraulic drive is provided by rotary action, variable displacement, vane pumps, mounted in tandem, which allow accurate control of pressure and flow. Chosen for their low operating noise, long life and short control times, they are coupled to an electric motor for a compact drive solution. The pumps are fitted with dual position W controllers, enabling different combinations of high flow / low pressure and high pressure / low flow to suit the machine’s duty cycle.
The direction and volume of hydraulic flow from the vane pump are controlled by two proportional directional valves, actuated by solenoids that are themselves energized by integrated electronics
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