- 學位論文
鐵氟龍管超音波及熱壓擴孔之研究
Reaming Teflon Tubes Using Ultrasonic Machining and Hot Stamping
摘要
在機械設備及線材，透過鐵氟龍管來包覆材料，使機器能穩定的運作。機械材料或線材需要外層所保護，例如高溫、化學腐蝕的使用上，會使線材老化溶解變質或腐蝕，則會包覆上一層對於高溫及腐蝕有極佳的安定性鐵氟龍管系列材料，是工業界上的一種方法，國內目前為止尚未有自製此商品，而商品都是以外國進口加工完成品，因此價格昂貴，對業界增加耗材成本。 本論文主要研究以超音波加工及熱壓加工方法在鐵氟龍端面擴孔，以利於增加熔接面積，除了進行參數研究外，並對專用擴孔之聲波焊頭進行設計及分析，利用ANSYS的有限元素分析法模擬出應力分布與振幅大小及製作最佳形狀焊頭外，對相關加工參數如焊頭形狀、焊頭材質等加工參數以及相關模具設計及製作。 此研究是以超音波方式頻率15KHz的焊頭擴孔及熱壓機以熱壓方式擴孔的比對，經實驗結果超音波15度擴孔焊頭為最佳擴孔方式，可得知超音波擴孔硬化時間對鐵氟龍管影響為最大，熱壓成型方式雖然可達到擴孔不錯的效果，但鐵氟龍管會產生熱縮現象，使得孔徑縮小，因此總結擴孔方式最佳效果為超音波擴孔以15度焊頭為最佳。
並列摘要
Machinery and cable materials can be encased within Teflon tubes to ensure machine stability during operation. A protective outer layer must be wrapped around machinery and cable materials to safeguard them against high temperatures or chemical erosion, which cause degradation, dissolution, deterioration, or erosion. Thus, manufacturers typically encase machinery and cable materials in Teflon tubes, which manifest excellent stability against high temperatures and erosion. However, Teflon tubes are presently not produced in Taiwan, necessitating Taiwanese manufacturers to import costly Teflon tubes, which increases their production costs. The present study primarily employed ultrasonic machining (UM) and hot stamping (HS) to ream the end surface of Teflon tubes for expanding the welding area. Relevant parameters were reviewed to design and analyse a sound wave welding head specifically for reaming use. In addition, ANSYS finite element analysis software was employed to simulate the stress distribution and amplitude of various welding heads to develop an optimal welding head shape. This study also designed and developed various processing parameters, such as welding head shape and material, and relevant moulds. Comparing the UM reaming performance at a frequency of 15 KHz with that of HS involving a hot press revealed that the UM process involving a 15° welding head demonstrated the highest reaming performance, suggesting that the UM curing time imposed the greatest effect on Teflon tubes. Although the HS process also exhibited favourable performance, pyrocondensation was observed, leading to reduced pore sizes. Therefore, this study concluded that the UM process involving the 15° welding head produced the most favourable results.