| Summary: | 碩士 === 國立聯合大學 === 機械工程學系碩士班 === 99 === The purpose of this study used ultrasound elliptical vibration-assisted cutting to improve material’s cutting quality. In theory, the cutting force of ultrasound elliptical vibration-assisted was established, we substituted the cutting force into the motion equation of mass, damping and spring system and solved the value of theoretical prediction for these motion equations by way of mathematical skills. In the experiment, first the ultrasound gave a vibration source to the turning tool in single direction, then the balance of the original one-way amplitude was upset due to the asymmetric unit on head of turning tool, causing the ultrasound generated vibration sources both in x and y direction and resulted in an elliptical vibration. After completion of the experiment, we used the Surface Roughness Tester to measure the roughness of the surface of the workpiece and observed the cutting marks by microscope after the cutting motion finished. Finally, we used the simulation software to identify the eigenfrequency of CNC ultrasound cutting lathe and combined with the Taguchi method to analyzed the controlled factors’ effects to the surface roughness. Controlled factors including rotation speed of cutting, depth of cutting, type of ultrasound and feed speed, each factor has three level by using orthogonal array test, signal-to-noise ratios and analysis of variance. Therefore, we could find the significant of each controlled factor and the best combination of parameters. The results showed that the assisted turning ultrasound elliptical vibration cutting better than the traditional cutting of the processing quality.
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