在過去的超音波加工一直被認為是精密度不高的加工法，而雷射加工是大家普遍認為最理想的選擇，但此加工法
在工件周圍會有熱影響區發生，而且也會產生切削後之殘留應力，因此周圍的地方是無法被應用的，所以我們提出
超音波切削加工，只要能適當的控制參數，切割出來的品質絕對可以比雷射加工還優秀，許多人認為超音波加工
速度較慢，但刀具是可以經過設計的，只要刀具上製作數百個孔，一個批次切削會來得比雷射加工還快上許多。

本實驗主要研究超音波加工技術的精確性與精密度，分別探討以磨料粒徑尺寸的不同、濃度的多寡及振幅的大小觀察它們的表面
劈裂程度，從中歸納出幾項準則：粒徑大小主導邊緣破損大小程度；而濃度的高低控制邊緣破裂的多寡，以及
適當的振幅必須匹配適當的粒徑，才能產生絕佳的表面品質；另外曲率愈小，磨料在刀具上的排列會變得比較密不容易有空隙，
所排列會和刀具幾何形狀相類似，表面粗糙度會比較佳。

Ultrasonic machining is considered as one of the machining techniques with low accuracy and precision in the past.
Laser drilling is the preferred method instead. However, laser drilling suffers from the thermally damaged region
and the residual stresses associated with the high intensity energy focused on workpiece. With proper control of process
parameters, the quality of ultrasonic machining can be even better than that of laser drilling. Although the speed of
laser drilling in machining a single hole is much faster than that of ultrasonic machining, batch fabrication of ultrasonic
machining can be easily achieved via appropriate design of the cutting tool. Hundreds of holes can be machined at a signle run
and the machining rate is then much faster than that of laser drilling.

The major effort of this work is focused on the experimental investigation of the accuracy and precision of ultrasonic
machining. The influences of the process parameters such as the diameters and concentrations of the abrasive particles and the
amplitudes of the ultrasonic vibration of the cutting tool on the surface profiles of the machined workpiece are studied. A few
guidelines can be drawnd as follows: 1. The sizes of the abrasive particles determine the major scale of the irregular ridges on the
undulate margin of the machined hole. Large but sporadic protuberances occur stochastically. 2. The concentrations of abrasives
in slurry correlate with the quality of surface profiles positively. 3. Excellent surface profiles can be achieved by
proper matching of abrasive size and vibration amplitude of cutting tool. 4. Better quality of surface profiles can be obtained for
holes with larger radial of curvature.

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