Machining, Measurement, and Control Laboratory

High Productive and Safety Drilling of Hard-to-cut Materials by Intelligent MachineTools
-- Prevention of Tool Breakage and Extension of Tool Life by Adaptive Pecking in Machining Processes of Difficult-to-Machine Materials --

Makoto Fujishima (Mori Seiki)
Yoshiaki Kakino (Kyoto University)
Yoshinori Yamaoka (Yamazaki Mazak Corp.)
So Fukui (Mori Seiki)

This paper presents methodologies for safer, and higher productive drilling of difficult-to-machine materials by using the Intelligent Machine Tool. In particular, drilling processes of a Titanium alloy, Ti-6Al-4V, which is known as a typical difficult-to-machine material, is considered. By performing the pecking only when the chip jamming is detected, the maximum cutting torque can be regulated under the safe level. As a result, the tool life is extended by approximately 50% compared to conventional cases.

Keywords:   Intelligent machine tools, drilling, adaptive control, pecking, difficult-to-machine materials.