| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 104 === In recent years, the power transmission of ultrasonic assisted machining has been moving toward to non-contact, and the technique makes significant improvement on tool life of hard cutting material, processing quality and reduce the cutting force. The purpose of this paper is using ultrasonic vibration assisted tools with side-add-on contactless power transmission in drilling experiment, and compare the effect of ultrasonic assisted machining.
By using taguchi method to find a best combination for the experiment without CTS. This paper captured electric current of spindle motor and transformed into torque. The effects of ultrasound are investigated by thrust force, torque, chip, quality of hole and drill . CTS is used in the experiment to compare with ultrasound.
The ultrasonic frequency of drilling experiments are: 32.8kHz without CTS, and 33.7kHz with CTS. The first group spindle speed is 1600rpm, and feed rate is 100mm/min without CTS. The force signal have raised during the last 5mm. In the experiment without CTS, the cutting edge was chipped with ultrasonic, but the crater wear was reduced.
In the experiment without CTS, the spindle speed is 1600rpm and feed rate is 100mm/min, with ultrasonic assisted that amplitude on 6μm, 6.4μm, 7μm and 8μm. The thrust force rose 1%, 3.8%, 7.6% and 2.1%, the torque rose 0.1%, 1.8%, 6.9% and 1.1%, the surface roughness rose 12.4%, 4.9%, 7% and 3.5%. When the spindle speed is 2000rpm and feed rate is 60mm/min, with ultrasonic assisted that amplitude on 6μm, on thrust force rose 7.9%, on torque rose 6.3%, on surface roughness rose 19.5%. Maybe the ultrasonic assisted range is not suitable. But ultrasonic assisted have advantage on chip remove and chip breaker. For the experiment with CTS, the spindle speed is 3890rpm and feed rate is 428mm/min, with ultrasonic assisted that amplitude on 2μm, the thrust force rose 1.5%.
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