(1. 北京交通大學(xué) 機(jī)械與電子控制工程學(xué)院, 北京 100044；
2. 河北科技大學(xué) 材料科學(xué)與工程學(xué)院, 石家莊 050054)
摘 要: 通過對半固態(tài)合金流變充型機(jī)理分析, 推導(dǎo)出可以定量計(jì)算半固態(tài)A356鋁合金在圓管內(nèi)流變充型極限長度的數(shù)學(xué)模型, 該模型包括了工藝參數(shù)和半固態(tài)A356合金的自身特性。 采用間接擠壓鑄造阿基米德螺旋線試樣的方法對該數(shù)學(xué)模型進(jìn)行了實(shí)驗(yàn)驗(yàn)證, 實(shí)驗(yàn)結(jié)果表明： 理論計(jì)算值與實(shí)驗(yàn)測定值之間的最大偏差小于8%； 該數(shù)學(xué)模型可以定量分析和估算工藝因素對充型能力的影響, 并可預(yù)測充型極限長度, 這對半固態(tài)合金流變成形工藝設(shè)計(jì)和模具設(shè)計(jì)都有參考價(jià)值。實(shí)驗(yàn)和理論計(jì)算還表明, 充型壓力和充型速度是影響半固態(tài)合金充型能力的兩個(gè)主要因素, 提高充型壓力、 一定充型壓力下適當(dāng)減小充型速度都可以提高充型能力。
關(guān)鍵字: 半固態(tài)A356合金； 圓管； 充型能力； 理論計(jì)算； 極限長度
LI Zeng-min2, WANG Ying-jie2
（1. School of Mechanical and Electronic Control Engineering,
Beijing Jiaotong University, Beijing 100044, China;
2. School of Material Science and Engineering,
Hebei University of Science and Technology, Shijiazhuang 050054, China）
Abstract: A mathematical model, which can be used to quantitatively calculate the limiting length of semi-solid A356 alloy rheological filling in round pipe, was deduced by analyzing the mechanics of semi-solid alloy rheological filling. This model includes the processing parameters and self-character of semi-solid A356 alloy. The mathematical model was verified in experiment with the method of indirect squeeze cast Archimedean spiral proof sample. And the experimental results show that the maximum deviation between the theoretical value and measured value is less than 8%. This model can be used for quantitative analysis and estimating effects of the craft factors on the filling ability, and can also predict the maximum filling length. It has the important reference value to design the semi-solid alloy rheoforming technology and mould. The results of experiment and theoretical calculation also indicate that the filling pressure and filling velocity are two major factors that affect the filling ability, and both increasing filling pressure and decreasing properly filling velocity can increase the filling ability.
Key words: semi-solid A356 alloy; round pipe; filling ability; theoretical calculation; limiting length
