(合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，合肥 230009)
摘 要: 本文為研究Ti55合金板材電輔助V彎回彈規(guī)律，基于ABAQUS軟件平臺建立Ti55合金板材電輔助V彎電-熱-力耦合三維有限元模型。對板材V彎及回彈過程進(jìn)行正交試驗(yàn)?zāi)M，研究彎曲角、相對彎曲半徑、有效電流密度、成形速度對板材回彈的影響規(guī)律，建立了基于徑向基函數(shù)的回彈預(yù)測模型。結(jié)果表明：在選取參數(shù)范圍內(nèi)，隨著彎曲角、相對彎曲半徑的增大和有效電流密度的減小，回彈角增大；隨著成形速度的增大，回彈角先減小后增大。極差分析和方差分析得到彎曲角和相對彎曲半徑對回彈角有顯著影響。電輔助板材V彎相對機(jī)械V彎回彈角平均降低48.7%。進(jìn)行電輔助V彎實(shí)驗(yàn)，對比厚度、溫度和回彈角，平均誤差分別為9.4%、4.6%和13.4%，驗(yàn)證了有限元模擬及回彈預(yù)測模型的準(zhǔn)確性。
關(guān)鍵字: 鈦合金；電輔助；回彈預(yù)測；有限元模擬
（School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:In order to study the springback law of Ti55 alloy sheet by electrical assisted V-bending, a three-dimensional electric-thermal-mechanical coupled finite element model of electrical assisted V-bending of Ti55 alloy sheet is established based on the ABAQUS software. Orthogonal test simulation was carried out on the V-bending and springback process, the influence of bending angle, relative bending radius, effective current density, forming speed was studied, and a springback prediction model based on radial basis function was established. The results show that: within the range of selected parameters, as the bending angle and the relative bending radius increase, the springback angle increases. The springback angle decreases with the increasing of effective current density. As the bending velocity increases, the springback angle decreases first and then increases. Range analysis and analysis of variance show the bending angle and the relative bending radius have a significant effect on the springback angle. Compared with the mechanical V-bending, electrical assisted V-bending reduces the springback angle by 48.7% on average. Conducted an electrical assisted V-bending experiment, comparing the thickness, temperature change and springback angle, the average errors were 9.4%, 4.6% and 13.4%, which verified the accuracy of the finite element simulation and springback prediction model.
Key words: titanium alloy; electrical assist; springback prediction; finite element simulation
