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Compact production turning unit
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April 2007
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The Fuji PMD-2000 twin-spindle, front-loading style CNC lathe, with fully integrated high speed 150 m/min gantry loader, provides a fully automated production cell for first and second operation component cycles in a compact and rigid machining environment.
The machine is able to process components up to 120 mm diameter by 100 mm long and has two identical eight-station turrets to serve the two six inch (eight inch option) chucks. The 7.5 kW, 4,000 rpm zero-centre design spindles are mounted on independent x-axis slideways each having 200 mm stroke and the horizontal axis turrets on independent z-axis slideways having 150 mm travel. Control is by Fanuc 180i-TB.
The high rigidity base, with a compact footprint of 1,650 mm by 1,725 mm, is designed as two individual handed carcases in order to prevent any influence from spindle to spindle during cutting. For instance, witness marks could result when one spindle is engaged on roughing or intermittent cutting and the other on high tolerance or close surface finish machining. And, from its automotive ancestry the design of the machine means excellent access is available to serviceable items, swarf control is paramount and highly efficient, with chips falling unhindered onto a central conveyor for speedy exit at the rear of the machine.
Central to maintain high levels of productivity, the machine and its ability to run under limited manning or unmanned situations is the Fuji-developed high speed three-axis LX-10S gantry robot. Available with single or double gripper it has a loading time of 4.5 sec and minimum cycle time of 24 sec. This can be reduced to 12.5 sec for the twin gripper version. Rapid traverse speed is fast at 150 m/min in the x-axis, with 115 m/min for vertical axis and 50 m/min in the z-axis. Controlled via the Fuji MAX SPI robot control system, data entry is via touch screen from which the software automatically computes the most fluid and shortest time for movement.
A range of work stockers with 10, 12 or 20 stations can be integrated to input and exit stations with interfaces to measuring devices with feed-back correction.
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Author
Andrew Allcock
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