超音波加工用方形焊頭之設計與分析

Designing and Analysis of Square Welding Horn for Ultrasonic Machining

謝宗佑(Tzung-You Shie)

指導教授 ： 許坤明

國立虎尾科技大學/工程學院/創意工程與精密科技研究所/碩士(2011年)

https://doi.org/10.6827/NFU.2011.00016

摘要

本論文係以有限元素方法模擬方形焊頭，經由設計所得最佳外形尺寸，輔以製造超音波加工機的公司所提供之市售焊頭作對照，針對理論焊頭及現有焊頭分別做模態分析，結果得知理論焊頭比商用焊頭之自然頻率值較接近15kHz，能大幅提升加工效能及增加穩定性，也與實際所量測之自然頻率值相符。
為驗證超音波加工機用方形焊頭能在端面產生最大振幅，本論文採用Borland C++ Builder進行波形模擬，並以水波槽進行實際實驗，以及在方形焊頭上塗抹機油進行駐波觀察，將所得結果相互進行比較與分析。
本論文最後針對壓克力材料進行超音波焊接特性之研究，所使用的焊頭為方形單槽焊頭，試件的形狀為塊狀基材，探討的參數有熔接壓力、延遲時間、熔接時間與硬化時間等。利用田口式直交表進行 之實驗因子配置，並在超音波加工機上調整參數以及加工測試，熔接後之試件施以縱向拉伸試驗，將所得數據與實驗結果加以統計分析，以求得最有效之加工參數。

關鍵字

方形焊頭 ； 模態分析 ； 自然頻率 ； 最大振幅 ； 田口式直交表

並列摘要

This paper simulates the square welding horn by means of Finite Element Method. The best appearance and size of it is designed and compared with the welding horn provided by the company which manufactured ultrasonic processing machine in the market. By model analysis of the theoretic and the real welding horn, the author concludes that the theoretic welding horn has a natural frequency more close to 15 KHz then the commercial one, which can greatly increase the processing efficiency, enhance the stability and corresponding to the natural frequency measured in reality.
With the purpose of illustrating that the ultrasonic processor with square welding horn can generate peak amplitude at the end face, this paper uses Borland C++ Builder to carry out the simulation of wave form, makes actual experiment with the ripple tank, observes the standing wave by smearing engine oil on the square welding head and compares and analyzes the results.
The study on the ultrasonic welding characteristics of acryl material is made at the end of the paper. The welding horn used here is a square single slot one; the appearance of the test-piece is lumpy base material; the parameters discussed include welding pressure, delay time, welding time and hardening time, etc. The Taguchi orthogonal table are employed to configure the experimental factors of . The parameters of ultrasonic processor are adjusted and the processing experiment is made. The test-piece undergoes longitudinal tensile test. The data gained in these tests and the experimental results are analyzed statistically in order to get the most effective processing parameter.

並列關鍵字

Square Welding Horn ； Model Analysis ； Natural Frequency ； Peak Amplitude ； Taguchi Orthogonal Table

參考文獻

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