Effect of Focusing Acoustic Lens on Microcutting of Titanium Tantalum Alloy
When using power ultrasonic vibration to process titanium tantalum alloy,the number and speed of cavitati-on micro jets are key to the efficiency of micro cutting.Using a focusing acoustic lens to increase the sound pressure in the focusing area can improve cavitation efficiency.Increasing the number and speed of micro jets leads to an increase in machi-ning efficiency.A Fresnel diffraction lens based on a 35kHz sound source frequency is designed and manufactured.The work-ing environment of the lens is simulated using COMSOL software,and the optimal working position is determined.The lens will change the sound pressure distribution in the ultrasonic field,concentrate the sound pressure in a narrower range,and the lens focusing gain will be 2 to 10 times.Based on the simulation results,cavitation experiments are conducted on titanium tan-talum alloy.The experimental results show that compared to the lensless group,the surface roughness of titanium tantalum al-loy with a lens group changes more,the number of cavitation pits is more,and the pit depth and diameter width are larger.It can be considered that Fresnel focusing sound lenses have a promoting effect on micro cutting of titanium tantalum alloy.
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