Extended Range of Ultrasonic Machining Centers

DMG MORI extends its ultrasonic machining center portfolio with the Ultrasonic 20 linear 2nd Generation. According to the company, the machine offers high material removal rates, accurate edge machining and reduced process forces in the machining of advanced materials such as glass, ceramics, corundum, composite materials and hard metal. The machine is designed to minimize deflections while increasing workpiece accuracy and process reliability for users in the optical, clock and watch, medical, and high-precision mold construction sectors.

Spindle speeds range to 60,000 rpm and the Celos control is equipped with apps developed specifically for the series. Other features include a digitally-controlled ultrasonic generator as well as ultrasonic actuators with enhanced performance, the company says. Toolholders with adapted actuator technology are changed into the milling spindle automatically. Each of these holders contains piezo elements, which are activated by a program-controlled inductive system with a frequency of 20 to 50 kHz. Tool rotation is superimposed with an additional tool movement in the longitudinal direction so that a defined amplitude ranging to 10 microns, which can be programed in the NC-program, is generated on the cutting edge of the tool or on the grinding layer.

Oscillating contact interruption is said to result in improved lubrication and cooling of the cutting edge as well as increased removal of particles from the active zone. This enables longer tool life and surface qualities ranging to Ra < 0.1 microns for hard-brittle, difficult-to-machine materials.