A novel piezoelectric driven drilling tool called ultrasonic/sonic driller/corer (USDC) has been developed by the Jet Propulsion Laboratory, Pasadena, in cooperation with Cybersonics Incorporation. The device is supposed to drill holes and take rock samples in future space missions of the NASA. The driller consists of an ultrasonic resonator with a piezoelectric stack, a free mass and a drill stem. The actuator is the piezoelectric stack (4 PZT wafers) clamped between the steel backing and a stepped titanium horn for vibration amplitude amplification. Excited by the high-frequency vibration of the resonator the free mass oscillates between the horn tip of the resonator and the drill stem with a much lower frequency. The shock waves in the drill stem caused by the impacts with the free mass affect hard and brittle materials so effectively that small holes can be performed with extremely low contact force and a power consumption of only 5 Watt. There is no cutting edge and no lubrication needed. The paper gives a detailed description of the system build-up and mode of operation. To explain the drilling mechanism and enable optimized tool design, some experiments are carried out with a reproduction of the drill.
Charactisation and system analysis of a novel ultrasonic percussion drill
Beschreibung und Funktion eines neuen Ultraschall-Schlagbohrers
2006
7 Seiten, 7 Bilder, 2 Quellen
Aufsatz (Konferenz)
Englisch
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