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題 名 | 非軸對稱反向擠製橢圖孔管狀製品之管流模式與速度轉換軸向流模式上界限解之比較 |
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作 者 | 涂建祥; | 書刊名 | 技術學刊 |
卷 期 | 7:1 1992.03[民81.03] |
頁 次 | 頁35-44 |
分類號 | 446.325 |
關鍵詞 | 反向擠製; 非軸對稱; 速度; 管流; 製品; 模式; 橢圖孔管狀; 轉換; |
語 文 | 中文(Chinese) |
中文摘要 | 本文研究之主旨,是利用上界限法解析圓柱形胚料在室溫情況下,以平頂沖頭實施反向擠製成精圓孔管狀製品,在穩定成形過程中所需之相對擠製壓力及擠製負荷;本文採用管流模式,並藉流線之設定,導出動可容速度場與上界限解之公式,然後引入最佳化理論,求出相對擠製壓力及擠製負荷,予以分析討論,並延續專家採用速度轉換軸向流模式所提出之動可容速度場及應變率場,完成其上界限解;將採用上述兩種塑流模式所得之結果加以比較,發現本文採用的管流模式優於該速度轉換軸向流模式,本文僅作理論上之計算分析與比較,尚未作實驗與之對照。 |
英文摘要 | A new upper-bound solution of extrusion pressure and load is developed for nonaxisymmetric backward cold extrusion of ellipse-shaped tubes from round billets by using flat headed punchs under the condition of steady-state extrusion stage. A kinematically admissible velocity field which based on a tubular flow model is derived to formulate an upper-bound solution. The theoretical value of extrusion pressure and load are obtained by minimizing the extrusion power utilizing optimization theory. In this paper another upper-bound solution based on the kinematically admissible velocity field and strain rate field which derived by Nagpal using velocity transformed central flow model was also carried out, It was found that the tubular flow model in this paper is superior to the velocity transformed central flow model which proposed by Nagpal. |
本系統中英文摘要資訊取自各篇刊載內容。