Design and Research of Axial Vibrator Integrated with Miniature Turbine Cartridge
Date Issued
2012
Date
2012
Author(s)
Chen, Wei-Chih
Abstract
Present dental handpiece applies the high-speed rotation of the turbine to create cutting power. It is also verified that the integration of ultrasonic vibration into the machining technology can enhance the cutting efficiency. According to the above-mentioned background, the aim of this thesis is to develop a dental handpiece integrated with an axial vibrator to increase its cutting efficiency. The design process starts with study of vibration actuating principles, conceptual design and simulation. Two vibrators, the piezo-vibrator and the pneumatic vibrator, are developed, and a supporting structure is also designed to integrate the axial vibration with the head of the dental handpiece. Besides the individual performance testing of the vibrators, the influence of their operational parameters such as vibration frequency, amplitude and cutting load on the cutting efficiency are also separately tested and verified.
The supporting structure developed possesses a torsional flexibility that can provide the cutting tool an axial elastic loading. For an axial load of 0.52~0.84 N, the cutting stability of the turbine cartridge can be enhanced by 3.7 times with the supporting structure. The developed piezo-vibrator has the resonant frequency of 11.5 kHz with the maximum amplitude of 1.05 μm, and it can increase the cutting rate by 1.8 times. By using the aero hammer principle, the developed pneumatic vibrator can create the axial vibration with the frequency of 202~245 Hz and the amplitude of 1.3~2 mm for the air supply of 4.5 bar and the axial load of 24~37 N, and it can increase the cutting rate by 1.2 times.
Subjects
Dental handpiece
Axial vibration
Pneumatic vibrator
Piezo vibrator
Supporting structure
Integration of vibration and rotation
Type
thesis
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