Tongtai’s brand new iVU-5 is a rotary-type, ultrasonic-assisted machine that operates as a dual-function vertical machining center for machining advanced hard materials. The iVU-5 combines technology that can be used for microhole drilling and machining of glass, sapphire, silicon carbide, quartz, ceramic, hardened steel, high nickel alloys, and non-ferrous materials, according to Hsin-Pau Chen, PhD, deputy manager-technology development, Tongtai Machine & Tool Co. Ltd. (Kaohsiung City, Taiwan). The iVU-5 VMC was unveiled at
IMTS by Absolute Machine Tools (Lorain, OH).
“Any material that is softer than the cutting tool can be ultrasonic-assisted,” said Dr. Chen. “Rotary ultrasonic machining combines high-speed spindle rotation with high frequency vertical vibration of the cutting tool. The diamond tool impacts the material with high contact speed, reducing cutting force and producing ultra-fine finishes while improving cutting efficiency 3-5 times faster than conventional machining.” For ultrasonic operation, the Tongtai iVU-5 is equipped with automatic frequency search and lock via M-codes. The auto tuning range is from 15-45 kHz, and the amplitude range is 1 to 10 µm.
The Tongtai iVU offers X, Y, Z-axis travels of 500 × 400 × 350 mm and has a wide range of standard features for successful ultrasonic machining and long machine life. It features a Meehanite cast iron frame and roller-type linear slideways for rigidity and fast, precise movement. The 25-mm diameter ballscrews are Class 3 with a double nut preloaded design allowing a standard rapid traverse rate of 1890 ipm (48 m/min) in all axes with acceleration of 1.2 G. The iVU-5 is equipped with a 30-tool arm-type automatic tool changing (ATC) system, which changes tools in 0.8 seconds with 1.3-second chip-to-chip time. The 3 hp (2.24-kW), 20,000-rpm direct-drive spindle features dual-contact Big Plus 30 taper (BBT-30), which is standard as is a spindle chiller.
The three-axis machine is equipped with Siemens 828D control with 10.4″ (164-mm) TFT with ShopMill and Advanced Surface. The five-axis version is equipped with a Siemens 840D control with 17″ (432-mm) IPC, the Sinumerik MDynamics Technology package for five-axis milling, and ShopMill.