追頻式超音波輔助攻牙之研究

Investigation for Automation Frequency Tracing of Ultrasonic Vibration-Assisted Tapping

黃鴻斌(Hung-Pin Huang)

指導教授 ： 郭桂林

國立臺北科技大學/機電學院/車輛工程系所/碩士(2009年)

https://doi.org/10.6841/NTUT.2009.00075

摘要

近年來產品外觀的需求漸趨精巧化，相對地對產品製造的技術提升亦更加的困難，尤以小尺寸且深孔的內螺紋加工技術為甚。此外，航空業者為了減輕飛機的重量與增加飛機的飛行速度，因此鈦合金使用於飛機機件上日益增加。利用螺絲攻(Tap)以產生內螺紋是目前常見的一種加工方法。當螺絲攻於鈦合金攻牙的過程中，時常可見螺絲攻突然斷裂在工件的內孔，尤其是小尺寸的螺絲攻(小於M6以下)在攻內螺紋時，更是容易斷裂在工件的內孔中。
根據過去部分學者研究指出，於攻牙時導入工件本身的共振頻率輔助加工，超音波輔助振動的攻牙扭矩，會明顯小於無超音波輔助者。但由於超音波振動子會因為長時間加工而導致過熱，使振盪頻率與振幅產生不穩定現象，導致加工件的品質不穩定。因此本研究嘗試利用壓電振動子所產生之超音波高頻振動與運用LabVIEW軟體所撰寫出的自動追頻系統，採用追頻式超音波振動輔助攻牙機制，及選定加工參數（振動振幅、振動頻率和螺絲攻鍍膜樣式），對鈦合金工件進行振動輔助攻牙，分析追頻式超音波振動輔助內螺紋加工的影響。

關鍵字

螺絲攻 ； 內螺紋 ； 追頻式超音波 ； 攻牙

並列摘要

Refinement of industrial products is one of the main focus of current product development. Processing technique capable of small size and deep internal threads of producing nuts is urgently needed in modern manufacturing industry. Furthermore, the ever-growing use of titanium allays on aircraft components to reduce aircraft weight and thereby increasing aircraft speed is an on-going trend in the aircraft industry. Employing tap for cutting internal threads is currently the most widely used technique on a mass production scale in fastener manufacturing industry. However, problems of sudden breakage of taps are frequently encountered during tapping, particularly in the case of smaller tap size (M6 and below). In view of this, a non-traditional processing technique, i.e. frequency tracing in ultrasonic-assisted tapping, was introduced to tap nuts of small hole size.
According to the present research, the torque required for tapping associated assisted with ultrasound vibration was significantly less than the case with no ultrasonic assistance. The minimum value of tapping torque is normally observed when the resonant frequency of the work-piece itself is employed for assisting the tapping machining. However, natural frequency of the work-piece can change with the removal of the work piece material and rising of the temperature of the work-piece, among other factors. In the present research, the ultrasound vibration generated by the piezoelectric actuator and automatic frequency tracing system formulated by the LabVIEW software program were employed to study the tapping process for a titanium alloys. Established a plan of experimental, and the experimental investigation in ultrasonic-assisted tapping of titanium alloy, in order to realize the influence between developed frequency tracing system and manufacture parameters (operating voltage, the type of frequency tracing, the type of coating).

並列關鍵字

Tap ； Threaded hole ； Tracing of Ultrasonic

參考文獻

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