Improve Heavy-Duty Cutting Ability by 40%, High-Speed Large Horizontal Machining Center "NHX8000" Launched

Mori Seiki Co., Ltd. has started taking orders for the NHX8000 high-precision horizontal machining center from October 11, 2011. This machine is the latest model in the NHX Series, the X-class horizontal machining centers.

With a maximum workpiece size of φ1,450 mm x 1,450 mm and a maximum loading capacity of 3,000 kg, the NHX8000 is an ideal solution for machining large workpieces and difficult-to-cut materials, which are in great demand in the construction machinery, aircraft, vessel and energy industries. Especially, NHX8000 is suitable for various workpieces of construction machinery, such as cylinder block or hydraulic valve. We will introduce the NHX8000 with features including: (1) Original technologies for high-speed and high-precision, (2) High machining ability, (3) High Reliability, (4) Outstanding operability, (5) MAPPS IV + ESPRIT and (6) Compliance with safety standards.

(1) Original technologies for high-speed and high-precision

Inheriting the structural concept of previous NH Series models, the NHX8000 employs the Box-in-Box
Construction that supports the saddle at both sides. The Box-in-Box Construction covers the weak point of large  machine that column is likely to tilt due to the heavy weight of spindle head. Additionally, the symmetrical structure with respect to the spindle minimizes thermal displacement. Mori Seiki’s DCG (Driven at the Center of Gravity) technology is used for the X- and Z-axis drive. DCG controls vibration, the main factor preventing high-speed, high-precision machining, by driving moving parts at their center of gravity using two ball screws. As a result, machining accuracy is improved, machining time is reduced and tool life is extended. The NHX8000 has achieved roundness of 2.08 μm, as well as 20 % faster rapid traverse rate (50 m/min.) and about two times faster acceleration than the previous model. The excellent vibration control also contributes to improved surface quality.

For the B-axis drive, a full indexing table equipped with DDM (Direct Drive Motor) is available as an option. By transmitting the drive power directly to the rotary axis, DDM eliminates backlash and provides outstanding transmission efficiency and high-speed feed. The 90-degree indexing time is shortened to 1.8 seconds, half the speed of the previous machine.

(2) High machining ability

Compared with the conventional machines, the NHX8000 greatly improves the machining ability. It covers a
various machining from heavy-duty cutting to high-speed cutting. Heavy-duty cutting ability is improved by 40% compared with the conventional machines, due to the high output spindle of 40 kW.

Furthermore, the high torque specifications realize the best cutting performance with difficult-to-cut materials
such as titanium or stainless steel by the maximum torque of 1,309 Nm, the maximum spindle output of 55 kW and the largest inner diameter of the spindle bearing 120 mm. For high-speed cutting, the cooling oil circulating through the oil jacket around the spindle controls the heat generation during the high-speed spindle rotation, so the machine achieves high precision machining. It is suitable for a wide range of machining from heavy-duty cutting of casting parts for construction machinery and vessel to high-speed cutting of aluminum parts for aerospace and automobiles.

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