The HU63EX horizontal machining center (HMC) from Mitsui Seiki USA, Inc. is engineered to boost metalworking productivity through a combination of precision, power and torque. The 17,000 kg (37,400 lb) machine has a footprint of 2,900 mm (116") x 3,180 mm (127"), with X, Y and Z axes travels of 900 mm, 800 mm and 800 mm (36", 32" and 32").
The machine's structure is designed to maximize rigidity and accuracy. The bed is a single casting supported at three points, which helps minimize the effect of foundation fluctuations on accuracy. A thickened structure and rib configuration are intended to provide rigidity. The mating surface of each axis box way, as well as other important areas such as rotary axis mounting, ball screw mounting points and spindle attachment surfaces, are hand scraped to help provide precise geometric characteristics such as parallelism, squareness and straightness. This is intended to provide consistent accuracy over an extended period of time. Air cavities between the ways and the column mating surfaces are charged with low-pressure air, reducing the load on the way surface and enabling smooth movement without compromising rigidity, according to the company. Ball screws located at the center of each guide way also provide stable movement.
Mitsui Seiki reports that the machine offers X, Y and Z axis positioning and repeatability accuracy of +/- 0.001 mm (+/- 0.00004", or one micron), and B-axis (rotating the 630 mm [25.2"]-sq pallet) accuracy of +/- 2 second with repeatability +/- 1 second.
"The focus on accuracy and rigidity produces repeatable precision performance," said a company spokesperson. "In turn-boring operations on 10 consecutive workpieces the HU63EX achieves concentricity within three microns."
The machine's standard 50 taper, 6,000 RPM spindle offers 18.5/15 kW (30 min/continuous, 24.7/20 HP) power with 601 nm (443 ft-lb) torque, delivered through a two-step gearbox. Optional spindles include a 6,000 RPM, 26 kW/22 kW (34.8/29.4 HP) unit with 1,081 nm (797 ft-lb) torque and a three-step gearbox, and a 12,000 RPM, 30 kW/25 kW (40/33.5 HP) version with 420 nm (309 ft-lb) torque driven by an integral, built-in motor.
For more information contact:
Scott Walker, President
Mitsui Seiki USA, Inc.
563 Commerce Street
Franklin Lakes, NJ 07417
201-337-1300
www.mitsuiseiki.com