Optimal solutions for the future

Puma Machine Tools was established in 2001 when the company acquired the sole agency for the Machine Tool Division of Daewoo Heavy Industries & Machinery Ltd. Daewoo Heavy Industries & Machinery subsequently went through a name change to Doosan Infracore in 2005.

Doosan Infracore is one of the leading manufacturers of CNC lathes, machining centers and horizontal boring (milling) machines including machines for tool rooms, machines for small to medium batch size production, as well as highly specialised production machinery. From small gantry type CNC lathes up to multi-tasking CNC turning centers, their machines stand out as being cost effective and highly productive.

Their vertical and horizontal machining centers are well constructed strong machines. Their reliability in accuracy as well as performance is without doubt a great benefit to any user.

By integrating the capabilities of multiple machines into one system, the Puma SMX Series puts into use milling and turning capabilities that reduce machining time overall, and the number of machining operations a shop must handle

Doosan has been manufacturing machine tools for over 30 years and recently reached a production of close to 15 000 machines built in a year. Doosan Infracore is part of the Doosan Group (established 1896), which is one of the largest in South Korea, and its activities range from construction and engineering, power generation and power plants to chemical process equipment and multiple other related fields.

Doosan debuts “true five-axis” and multi-tasking machines
Doosan Infracore Machine Tool grabbed some of the spotlight with two CNC machine premieres at the recent IMTS 2014, a “true five-axis” machine and a new multi-tasking machine.

With advanced linear motor and direct drive technology, Doosan’s new FM 200/5AX linear full 5-axis machining center was developed for projects that involve simultaneous 5-axis contouring. According to the supplier, the FM 200/5AX linear offers manufacturers a reliable platform for machining numerous types of complex parts, including medical devices, and automotive turbo chargers – any component design with a high emphasis on precision.

The FM200/5AX linear machining center is built on a rigid bridge-type base formed in a high-stability mineral composite material. Because mineral castings absorb vibration at ten times the rate of iron castings, and provide much more thermal stability, parts are finished with exceptional surface finishes and tool life increases significantly.

The FM200/5AX Linear machining center is built on a bridge-type base formed in a mineral composite material. The X, Y and Z axes are driven by linear motors, boosting acceleration/deceleration feed rates, with very little backlash. The fourth and fifth axes rotary tables are equipped with direct drive motors

The X, Y and Z axes on the FM200/5AX Linear are driven by high-precision linear motors, providing top-level acceleration/deceleration feed rates, with as good as no backlash. The fourth and fifth axes rotary tables are equipped with direct drive motors.

The table size is 200mm diameter with a capacity load of 15 kilograms. Travels on the FM 200/5AX linear are X-axis 200mm, Y-axis 340mm and Z-axis 300mm. Rapid traverse rates on all axes are 50 mpm, with a cutting feed rate of 20 mpm.

The 14 kW, 45 000-RPM spindle on the FM200/5AX Linear has an HSK E40 taper. As a result, vibration is minimized and stability is maximized. With 24-tool stations as the standard, productivity is improved with the reliability of a direct drive, servo-driven Automatic Tool Changer. Maximum tool diameter is 50,8mm, maximum tool length is 180mm and maximum tool weight is one kilogram.

According to Doosan, experienced machinists will appreciate the benefits provided by Heidenhain CNC control, especially when approaching a complex part with full five-axis contouring. The FM200/5AX Linear also offers Heidenhain TNC control with an ergonomic swivel pendant and user friendly 19-in. screen.

3G mill-turn machine
Doosan’s second premiere was the Puma SMX 3100 S multi-tasking machine (MTM), its third generation milling-turning MTM, integrating the capabilities of a vertical machining center and horizontal turning center. The Puma SMX Series is distinguished by a rigid 90° vertical axis and forward positioned automatic tool changer, to improve milling capabilities as well as enhanced operator ergonomics.

The Puma SMX Series will initially be made available in two sizes, the Puma SMX2600, with a 10” chuck and 78mm bar capacity, and the Puma SMX3100, featuring a larger 12” chuck with 102mm of bar capacity. Both Puma SMX models have the capacity to machine parts up to 1525mm in length and 660mm in diameter. The X1-axis travel is 630mm, Z1-axis travel is 1585mm and the Y-axis is 230mm. Rapid Traverse, X1, Z1 & Y: 50/50/36 m/min.

The machines’ multi-tasking functions decrease the total processing time and number of machining operations by using a single setup, which results in exceptional high-speed performance for manufacturing processes that require accuracy and complex machining capabilities for turning, milling, and secondary operations. Using the SMX sub-spindle is an available option.

The Puma SMX Series executes high-precision machining thanks to high-rigidity construction using finite element analysis (FEA) in structural design and minimizing thermal deformation via an oil cooler, and an accuracy-control feature based on multiple thermal compensation functions. The Y-axis machining area has been maximized through orthogonal design.

Ergonomic design also enhances the operators’ convenience in set-up and operation, as well as maintenance – all of which contribute to the customer’s satisfaction.

High-accuracy control functions maintain precision during long-term machining processes by minimizing the thermal deformation of the spindle and the feed axis, and by maximizing the precision through the 0.0001° B-axis and C-axis. The oil cooler minimizes thermal deformation of the spindle and feed axis, and high rigidity and high precision are achieved with roller-type linear motion guides on all carriages.

The Puma GT2100 turning centers occupy a smaller footprint and represent improved accuracy and reliability

The design of the Puma SMX Series machines promote easy access for maintenance and optimise operator convenience by including customized functions — including front-located tool magazine (80 tools max), side-to-side movable, 85° swiveling Fanuc 31i control panel with adjustable height, and ATC operation panel (tool-to-tool change: 1.8 sec.).

Compact turning centers improve accuracy, reliability
The Puma GT2100 8″ and 10″ turning centers from Doosan are based on the company’s Puma 240 machines, with compact footprints and improved accuracy and reliability. According to Doosan, the machines are 14 to 25 percent more compact than previous models.

The turning centers feature a 30-degree, single-piece slant-bed design said to reduce the center of gravity of both the spindle and cross-slide. Features such as wide ribs and a box-type slideway reinforce bed rigidity. The swing over the bed is 600mm, while the swing over the saddle is 390mm. Maximum turning diameter is 390mm, and maximum bar working diameter is 81mm. Maximum turning length is 560mm.

The 18,6 kW spindle provides speeds ranging to 4,500 rpm, and its overhang design minimizes the rotational inertial load. The spindle is equipped with three angular ball bearings in the front and cylindrical ball bearings in the rear. According to Doosan, this arrangement minimizes thermal growth and increases precision. Rapid traverse rates are 24 mpm in the X axis and 30 mpm in the Z axis.

The 12-station turret accommodates OD tool sizes ranging to 25,4 x 25,4mm and maximum boring bar size ranging to 40,6mm. Indexing time is 0.3 sec., the company says. BMT55P turret tooling, available on the Puma GT 2100M, is fixed to the turret with four bolts and keys for high efficiency and rigidity. Rotary tool speed ranges to 5,000 rpm with a 5,6 kW rotary tool motor.

The Puma GT2100 turning centers feature energy-saving features such as an efficient hydraulic unit, LED worklight and automatic power-off functions. They are also equipped with a Doosan-FANUC i control and a 10.4″ color TFT LCD monitor. Doosan EZ Guide i is included for conversational programing of roughing, finishing, castings, grooving, threading, peck drilling and more.

Other machines
Puma Machine Tools also markets Chevalier surface grinders, VTEC-Vision Wide Tech double column machining centers and the CSM tube bending machines.

For further details contact Puma Machine Tools on TEL: 011 976 8600 or visit www.pumamachinetools.co.za