(上海交通大學(xué) 機(jī)械與動力工程學(xué)院, 上海 200030)
摘 要: 在由塑性成形理論和能量法分別建立的臨界破裂和臨界起皺壓邊力模型基礎(chǔ)上， 構(gòu)建了變壓邊力情況下汽車用鋁合金板的成形窗口，并分析了拉深比、 材料參數(shù)和模具參數(shù)對成形窗口的影響規(guī)律。 對比實驗表明： 在整個有效壓邊力范圍內(nèi)， 數(shù)學(xué)模型構(gòu)建的成形窗口能夠與實驗相吻合， 且鋁合金6111-T4和5052-O的成形窗口明顯小于鋼板st14的。 而影響因素分析顯示： 隨著拉深比降低、 厚向異性系數(shù)（r）增加和凹模圓角半徑（Rdp）增大， 成形窗口明顯擴(kuò)大； n值增加， 成形窗口雖然有所擴(kuò)大， 但是效果并不明顯。
關(guān)鍵字: 鋁合金板； 變壓邊力； 成形能力； 起皺； 破裂
at variable blank-holder force
（School of Mechanical Engineering,
Shanghai Jiao Tong University, Shanghai 200030, China）
Abstract: Based on the variable blank-holder force(VBHF) models of critical fracture and critical wrinkling derived respectively from plastic deformation theory and energy method, the formability windows of automotive aluminium alloy sheets at VBHF were established, and the effect of drawing ratio, material parameters and die profile radius on formability window were analyzed. The comparison results show that the above formability windows are in agreement with the experiments in the range of effective blank-holder force, and the formability windows aluminium alloy 6111-T4 and 5052-O are less than that steel st14. The influencing factor analysis shows that the formability window obviously expands with the decreasing of the drawing ratio and the increasing of the normal anisotropical coefficient r-value and the die profile radius, but the effect of the hardening exponent n-value on formability window is not obvious.
Key words: aluminium alloy sheet; variable blank-holder force(VBHF); formability; wrinkling; fracture
