未來展望

超音波振動應用於金屬塑性加工所產生的效應相當複雜。由 超音波振動壓縮與抽拉之研究，本論文已成功證明超音波振動能有效 降低成形加工的應力，進而由模具與工件之「介面間距變動摩擦效應」

與「溫度效應」，提供了超音波振動於成形加工的摩擦影響評估。雖

影響，需進一步的探討與研究，茲分述如下：

1. 受限於超音波振動設備的輸出功率，及無法長時間運作的 缺陷，以致於超音波振動成形無法廣泛應用於需求大成形 應力之擠製、鍛造成形製程。目前本研究只能進行壓縮、

衝壓之實驗。因此在未來研究中，需尋求更高功率，且運 作時間長之超音波振動產生設備，進一步探討超音波振動 於成形之應用。

2. 超 音 波 振 動 應 用 於 金 屬 塑 性 加 工 所 產 生 的 效 應 相 當 複 雜。除降低塑流應力外，還包含了摩擦效應與材料溫度上 升。且超音波振動製程現象在高速發生，藉由傳統儀器實驗 量測分析去理解其改善機制是很困難，因此需尋求適當的量測 儀器與方法進行量測分析。

3. 目前本研究只能以間接與區域平均的溫度量測取得超音波振 動產生的溫度效應資料。對於實際試片的溫度場分佈與介面的 溫度上升，其量測則還有些困難。因此在未來研究中，需設計 更精確的超音波振動溫度量測法與採用功率較大的超音波振 動設備，進行較大尺寸試片的實驗進行研究，探討實際試片的 溫度場分佈與介面的溫度上升，藉此釐清超音波振動的溫升關 係。進一步確立超音波振動於端面壓縮的機制。

4. 本 論 文 中 所 採 用 的 超 音 波 振 動 條 件 ， 均 為 單 一 頻 率 與 振 幅。因此，在未來研究中可利用多種不同的頻率與振幅，進 一步探討頻率與振幅對超音波振動產生機制的影響。

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