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題名 | 利用上界限法對複合擠製製程之研究=A Study of Combined Extrusion by the Upper-Bound Approach |
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作者 | 黃興漢; Huang, Hsin-han; |
期刊 | 大漢學報 |
出版日期 | 19981100 |
卷期 | 12 1998.11[民87.11] |
頁次 | 頁71-90 |
分類號 | 472.24 |
語文 | chi |
關鍵詞 | 上界限法; 複合擠製製程; |
中文摘要 | 本文中利用幾種動可容速度場針對軸對稱杯一杯形複合擠製的問題作研究。基於這些速度場的假設,本文利用上界限法分析複合擠製製程,並評估於不同變形階段的上沖頭平均壓力。由理論分析可知。上沖頭的平均壓力與複合擠製零件的反向面積減縮比呈現近似於拋物線方程式的變化曲線,而與前向面積減縮比則呈單調函數的變化曲線。於擠製製程中,隨著沖頭行程的逐漸增加,變形材料的流動模式會從初期階段的穩態流動轉變到後期階段的非穩態流動。同時,在初期和後期階段,皆有三種可能的流動模式,它們分別是單純前向流動、單純反向流動和複合前反向流動。由本文中的理論分析實驗印證比較可知,二者的結果相當吻合,可作為工業界設計杯一杯狀複合擠製的參考。 |
英文摘要 | In this paper, several kinematically admissible velocity fields for cup-cup axisymmetric combined extrusion are advanced. On the basis of these velocity fields, the upper-bound approach is applied to analyze the process of combined extrusion and to estimate the average upper-ram pressures at different stages of deformation. It is found that the average upper-ram pressure varies with the reduction in area of the backward-extrusion part, and that it varies montonously with the reduction in area of the forward extrusion part. During the extrusion process, with progressive penetration of the upper ram, the deformation flow may change from steady flow in the early stages into non-steady flow in the final stages. Moreover, both in the early stages and in the final stages, there are three possible flow patterns:simple forward extrusion; simple backward extrusion; and forwardbackward extrusion. Good correlationis found between the theorical and experimental results. The results presented in the paper can be used for process design. |
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