| Summary: | 碩士 === 國立中興大學 === 機械工程學系所 === 105 === This study explores a new type of hardening material cutting method “Ultrasonic oblique vibration assisted turning”.Ultrasonic oblique vibration assistance is based on the development of ultrasonic-assisted cutting technology, use a special structure and the combination of piezoelectric actuators, in the cutting produce a YZ direction of the oblique ultrasound reciprocating motion (turning). Compared with the elliptical ultrasonic vibration assisted steering, the vibration trajectory will make the front and rear tool face separate from the chip, have the advantage of elliptical vibration, and only use a piezoelectric actuator so that the structure is relatively simple, and simple structure and Single piezoelectric actuators can also significantly reduce the cost of tooling.
In this paper, we first discuss the ultrasonic turning assisted machining, and use the vibration theory and structural analysis software to simulate the design of an oblique ultrasonic vibration assisted turning tool, and then compare the results of the turning experiment with the tool.
The vibration frequency is f = 15.9 kHz, the amplitude of the oblique vibration is 4μm, the cutting depth is b = 10μm, and then the cutting frequency is 15.9kHz, the workpiece radius is R = 11mm, the workpiece length is L = 200mm, the vibration frequency is f = The two cutting parameters are fixed for the feed rate fixed F = 32mm / min and the fixed feed rate S = 0.025mm / rev. And the vibration speed and cutting speed ratio is divided into three kinds of speed and with or without vibration to carry out six conditions of the turning experiment. Experimental results show that, due to the application of oblique ultrasonic vibration, with two-axis vibration reciprocating high-frequency cutting, can make the surface quality of the workpiece has improved, shorten the chip and the chip can be easily removed from the workpiece effect; Than the impact of oblique vibration on the cutting effect, the greater the cutting ratio, that is, vibration speed is greater than the cutting speed, there will be better oblique vibration ultrasonic assisted cutting effect.
This study aims to achieve the same processing effect as elliptical ultrasonic vibration assisted turning with a relatively simple special structure, a single vibration source and a lower cost. In this way, in the industry will be able to lower the cost of processing some non-vibration turning materials can not be processed or can make the original processing of materials can have good accuracy and surface quality performance.
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