超音波熔接熱塑性高分子材料之導能角設計與熔接性之研究

Study of Energy Director Shape and Weldability for Thermoplastic Polymeric Materials Ultrasonic Welding

紀致瑋(Chi-Wei Chi)

指導教授 ： 許坤明

國立虎尾科技大學/工程學院/機械與電腦輔助工程系碩士班/碩士(2013年)

https://doi.org/10.6827/NFU.2013.00144

摘要

超音波塑膠熔接( Ultrasonic Welding of Thermoplastics )是一種快速又乾淨的熔接方法，其特性為熔接時間較短、較節省能源及熔接強度較高，但對於熔接品質控制之研究與導能角(Energy Director)對於熔接性之影響，卻未能找到其有效之控制方法。
本論文將設計製造兩種不同導能角( Energy Director )幾何形狀藉由超音波頻率量測器來檢測Horn是否達到適當的振幅值，並搭配光纖位移計與熱影像儀以及應變規實驗來探討Horn的前端輸出振幅、溫度及下模座受力之關係以求得最佳導能角之設計與提升熔接品質。
結果顯示，振幅輸出的大小、Horn發振的熱與應變數據之範圍，三者環環相扣、相互影響，之後再使用光學顯微鏡與超音波氣密試驗，來做最後熔接品質的檢驗。三個關鍵因子來做為熔接品質的控制，不但品質獲得提昇，且有助於改善塑膠熔接所衍生的諸多變數，更使業界在解決超音波塑膠熔接問題單純化。

關鍵字

超音波焊頭 ； 導能角 ； 塑膠熔接 ； 熱溫度 ； 應變規

並列摘要

Ultrasonic plastic welding is a rapid and clean welding method that is characterized by short welding time, low energy consumption, and high welding strength. However, regarding research of welding quality control and the effect of the energy director on weldability, effective control methods have not been identified.

In this study, two energy director geometries were designed and manufactured, employing ultrasonic frequency measurement devices to detect whether the horn achieves an appropriate amplitude. An experiment adopting an optic-fiber displacement sensor, thermal imager, and strain gauge was conducted to investigate the relationships among horn displacement, temperature, and the force received by the baseplate, to optimize the design of the energy director and improve welding quality.

The results show that the range of output amplitude, horn oscillation heat, and strain data are connected and mutually influential. An optical microscope and ultrasonic tightness test were subsequently conducted to test the final welding quality. Three key factors were used in the welding quality control, enhancing the quality and improving numerous derived variables of plastic welding. This process also simplifies the solution of ultrasonic plastic welding problems in the industry.

並列關鍵字

Ultrasonic Horn ； Energy Director ； Plastic Welding ； Thermal Temperature ； Strain Gauge

參考文獻

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