Effective Machining of Long Pipes and Rods for Offshore Plants and Oil Exploration

Doosan Machine Tools America (Pine Brook, NJ) presents their PUMA 1000/M that is specifically developed for oil applications that require the machining of large diameter parts. It incorporates a highly-rigid live tool turret and easily machines large rings, flanges, shafts, pipes and more. Its spacious working area provides a maximum machining diameter of 1,000 mm (39 in) and a maximum machining length of 2,040 mm (80 in). Most notably, the wide spindle through-hole of up to 560 mm (22 in) enables the processing of long pipes and rods required for offshore plants and oil exploration. Equipped with a two-stage gearbox featuring a high-output spindle with a maximum output of 75 kW (100 hp), the PUMA 1000/M has the strongest cutting capacity in its class. It is also equipped with a 250 mm (10 in) thick turret with a more robust design than the previous model. The adoption of a highly reliable servo motor for the turret reduces vibration during turning and milling, maximizing stability during heavy duty cutting.

Massive front and rear chucks stabilize long workpieces for precision while a special creeping feature feeds the tailstock center into the work piece smoothly. Unlike some competitive models, the PUMA 1000B/MB incorporates special covers at the rear to keep the work area clear of coolant and chips. To further enhance user convenience, the PUMA 1000/M provides a programmable tailstock with a built-in dead center and user-friendly Easy Operation Package (EOP) smart software program and EZ functions as standard features. Another standard feature is arbitrary speed threading that allows the operator to change the speed during the threading cuts to eliminate chatter. Additional options can be configured to suit the customer’s unique applications, such as twin chucking, vibration damping, long boring bar, automatic tool setter, linear scale, etc.

“This heavy duty, big bore turning center can handle the largest workpieces with a combination of stability, power and control,” says Jim Shiner, the director of sales and marketing at Doosan Machine Tools America, which also offers the DHF 8000, an 800 mm twin-pallet 5-axis horizontal machining center with a nodding head that is specifically designed for the processing of large, complex parts used in the oil field. The nodding head spindle and rotary table (A- and B-axis) allow the DHF 8000 to handle a complete range of machining processes, from roughing to finishing, in a single setup. This configuration makes quick work of multi-face workpieces and the 5-axis simultaneous machining of complex shapes. The nodding head spindle rotates through 160 deg (up/down) and has a maximum speed of 6,000 rpm with 960 Nm (708 ft-lb) of torque. The Y- and Z-axis are fitted with dual ball screws to ensure greater structural stability and accuracy, while the column is designed with high static and dynamic rigidity to provide optimum machining performance.

This scaled-up HMC can easily support workpieces weighing up to 2,000 kg (4,409 lb), allowing them to be machined with the same precision as their much smaller counterparts. Its large working area can readily hold parts up to 1,400 mm (55 in) diameter. Other performance and precision enhancing elements include glass scales for each axis, cooling systems for the spindle and ball screws, center-through chip disposal, and an upgraded waste oil disposal system. “This robust design with 800 mm twin pallets, high speed, built-in precision and minimum footprint is well-suited to machining large, higher-end oil field parts at a very competitive price,” added Shiner.

Doosan Machine Tools America, 19A Chapin Road, Pine Brook, NJ 07058, 973-618-2500, Fax: 973-618-2501, www.doosanmachinetools.com.