Machine maker DMG goes all-out in America

  • 08-Dec-2008 03:46 EST
dmc55h.jpg

In addition to the 360° rotary table in the standard version of the DMC 55 H ECO, an optional NC rotary indexing table is available.

After having displayed many of its machining products at September’s International Manufacturing Technology Show (IMTS) in Chicago, and after having held a grand-opening celebration in October for its new technology center in Los Angeles to support and expand its customer base in that part of the country, DMG has high expectations for the U.S. market from coast to coast. So much so that it is considering construction of a U.S. manufacturing plant. It already has 12 production sites across the globe.

At IMTS, DMG exhibited several machines. The DMC 55 H ECO horizontal machining center had its world premiere there, and it is one of the machines the company houses at its Los Angeles tech center for customers to use for test cuts, operator training, time studies, and other purposes.

DMG has particularly high hopes for that machine. The 22.0 x 23.6 x 23.6-in (550 x 599 x 599-mm) traverse area of the axes in the X, Y, and Z direction is generously dimensioned, says the company, with the pallets having a 15.7 x 15.7-in (399 x 399-mm) clamping surface. In addition to the 360° rotary table in the standard version, an optional NC rotary indexing table is available. Positioning times of 0.8 and 1.2 s at 90° or 180° (NC indexing table) contribute to reduced machining times. The maximum load of up to 1102.3 lb (500 kg) allows the use of heavy workpieces and sturdy clamping means.

A 45-position wheel magazine offers sufficient flexibility and high productivity, according to the company. Chip-to-chip time is only 3.9 s. Spindle speed is 12,000 rpm, which because of its narrow design can plunge deep into the workpiece, if needed, and easily master even more complex chip-removal tasks with its 81.1 lb·ft (110 N·m) and 26.8 hp (19.9 kW), says DMG. Traverse speeds of 1968.5 in/min (50,000 mm/min) and dynamic acceleration values of 196.9 in/s2 (5000 mm/s2) in all axes ensure short ancillary times and a high degree of efficiency.

The DMC 55 H ECO is also very precise, DMG says. The thermo-stable basis of the machine is its innovative duoBLOCK concept, comprising the inherently stable machine bed with its proven three-point support and the solid rear wall. The Siemens 810 D powerline control system is integrated in the DMG panel that includes a 15 in thin-film transistor monitor and full-size keyboard.

Among the other machines displayed at IMTS was the new DMC 75 H duoBLOCK. This chilled standard motor spindle with a rotational speed range up to a maximum of 10,000 rpm reaches a torque of 212.4 lb·ft (288.0 N·m). To meet even higher requirements, DMG offers an option with a 12,000-rpm motor spindle, also actively chilled, that boasts 69.7 hp (52.0 kW) and 317.2-lb·ft (430.1 N·m). Paired with high advance forces of up to 12 kN (1.3 ton), this should be largely sufficient to machine even special aluminum alloys—especially those used in the aviation and aerospace industries—at very high cutting speeds, the company says.

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