Turning Center targets oil-field applications.

Press Release Summary:

Providing 25.6 x 39 in. work envelope, Puma 480D features 10.8 in. through-hole diameter, 60 hp turning power, 3,293 lb-ft torque, and up to 6,102 lb Z-axis thrust. Wrap-around guideways are induction hardened, precision ground, and bonded with low-friction fluroplastic coating to minimize wear and dampen vibration. Power is supplied by 2-speed gearbox, generating spindle speeds up to 1,000 rpm. Employing 12.6 in. dia Curvic coupling, 12-station turret exerts 23,606 lb hydraulic clamping force.

Original Press Release:

On Display at IMTS 2010



West Caldwell, NJ - With a generous 10.8" through-hole diameter, plus 60 Hp of turning power...3,293 ft-lbs spindle torque...up to 6,102 lbs Z-axis thrust...and optional self-centering chucks that can be front and rear mounted, Doosan's new Puma 480D is designed specifically for oil-field applications. But it has all the power, speed and precision to produce any parts within its 25.6" diam. x 39" long (80.4" optional) work envelope.

Widely spaced, wrap-around guideways assure years of speed, stability, and accuracy. Each is induction hardened, precision ground, and bonded with a low-friction fluroplastic coating to reduce wear, dampen vibration, and enhance surface finish. A final hand scraping provides the ideal surface for lubricant flow.

Massive Meehanite beds further dampen vibration and help dissipate heat. The 45° slant bed allows convenient access to tools, chucks, and work pieces, while enabling easier, more thorough chip removal. Torque tube design, a characteristic of all Puma horizontal turning centers, eliminates bending and twisting, and provides a through-the-bed conduit for cooler, consistent operating temperatures.

A 5.9" thick turret head that's mounted on the same ground surface as the tailstock maintains perfect alignment and center height. The heavy duty, cartridge-type spindle is supported by a double row of cylindrical roller bearings on either side of duplex angular thrust bearings. Cylindrical roller bearings with a large contact surface provide the high rigidity needed for heavy cuts with high precision. Power is supplied by a two-speed gearbox, generating spindle speeds up to 1,000 rpm and powerful low-end torque. The gearbox and motor are positioned away from the spindle, eliminating the transfer of heat and vibration.

Double pre-tensioned ball screws, supported on both ends by precision class P4 angular contact thrust bearings, are located on the X and Z axes. Both interface with large diameter ball screws selected for high accuracy, feed thrust, and rapid traverses. The ball screws are protected by torque limiter clutches to minimize damage in the event of a crash.

The 12-station turret employs a large 12.6" diameter Curvic coupling, and exerts 23,606 lbs. of hydraulic clamp force. Indexing repeatability is +/-0.00008" on the X axis and +/-0.00012" on the Z. A high-torque index motor controls turret rotation, deceleration and clamp. Turret indexing is non-stop bi-directional, with a 0.25 sec. next-station indexing time. A rotary encoder determines the turret position, and a proximity switch confirms clamp.

Standard features on the Puma 480D include a programmable tail stock; waylube separation system; high pressure coolant system; automatic forced lubrication to all guideways, ball screws, and tailstock quill; and a tool monitoring system. The controller is the Fanuc 0iTD.

The Puma 480D will be demonstrated at IMTS 2010, South Hall, Booth 8100.

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