Doosan Machine Tools has evolved its popular and field-proven “DNM” series of vertical machining centers with a step up in the speed of the machines with faster spindle acceleration and deceleration rates. Other new developments are rigid roller guideways and a new grease-based lubrication system that requires a refill only every three to six months rather than every few days with oil, which cuts down on a customer’s time, expenses and also improves the factory environment and disposal issues. Also new is a cyclone coolant filter, which eliminates changing the conventional bag-type that is easy to forget to do and problems can ensue. The new DNM VMCs are general purpose, workhorse machines for customers who need robust and accurate performance.
The new DNM series is comprised of three machines, the DNM 4500, 5700, and 6700, stepped up in size and capacity. In general the series offers larger cutting space by 6%, bigger table sizes by 14% and heavier loads by 25% while maintaining the same overall footprint as the previous generation. For the three models, the X-axis travel is 800mm, 1050mm, and 1300mm. Y-axis is 450mm, 570mm, and 670mm. Z-axis is 510mm, 510mm and 625mm.
The new DNM series features direct-coupled, thru-coolant type spindles as standard, providing 8 000 rpm (15/11 kW) and 12 000 rpm (18.5/11 kW). Vibration and noise are greatly reduced during high-speed operations and thermal displacement is also improved. The direct drive spindles also contribute to faster acceleration/deceleration rates and tool change times have also been optimised to reduce non-cutting time. Tool storage ranges from 30 up to 60 stations. Additionally, the thru-the-spindle coolant design keeps the coolant exactly where it needs to be – at the tool tip – and machine operators do not have to keep adjusting and monitoring coolant nozzles.
Other specifications include a Big Plus 40 tool taper interface and table sizes of 1 000m x 450mm, 1300 x 570mm and 1500 x 670 mm. Maximum table loads are 600kg, 1000kg and 1300kg.
One of the key highlights to mention about the control system is the standard “Easy Operation Package” (EOP), developed by Doosan that provides numerous functions designed for expedient operation via pop-up windows and “hot keys”. For example, adaptive federate control, tool management, tool load monitoring, table setup, tool changer recovery are among the several convenient choices.
The DNM series also comes standard with a Renishaw OMI-2T optical probe interface. Easy operation of the feature is offered through a Renishaw/Doosan designed GUI.
For more information contact Puma Machine Tools on TEL: 011 976 8600 or visit www.pumamachinetools.co.za
