(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院, 長(zhǎng)沙 410083；
2. 長(zhǎng)沙通信職業(yè)技術(shù)學(xué)院 數(shù)學(xué)系， 長(zhǎng)沙 410015)
摘 要: 在注塑機(jī)上利用非平底凹模制備了形狀較復(fù)雜的鋁板/聚丙烯復(fù)合結(jié)構(gòu)件， 實(shí)現(xiàn)了將金屬板料成形、 塑料注射成形融為一體的復(fù)合成形的新工藝。 利用彈塑性大變形更新的Lagrange有限元法對(duì)于復(fù)合成形中鋁板成形過程進(jìn)行了數(shù)值模擬。 成形鋁板的實(shí)驗(yàn)測(cè)試厚度與有限元模擬值具有良好的相符性。 鋁板成形中形成3個(gè)板厚減薄較嚴(yán)重的區(qū)域。 板厚減薄嚴(yán)重的Ⅱ區(qū)， 發(fā)生了脹形變形和劇烈的塑性剪切變形。 Ⅰ區(qū)和Ⅳ區(qū)之間的大塑性變形區(qū)分為B區(qū)和C區(qū)2個(gè)部分， B區(qū)內(nèi)絕對(duì)值最大的主塑性應(yīng)變?yōu)樨?fù)， C區(qū)內(nèi)絕對(duì)值最大的主塑性應(yīng)變?yōu)檎?Ⅲ區(qū)與Ⅳ區(qū)之間的D區(qū)絕對(duì)值最大的主塑性應(yīng)變?yōu)樨?fù)。
關(guān)鍵字: 鋁板成形； 塑料注射成形； 塑性變形； 有限元
aluminum sheet via plastics injection molding with mold of non-flat bottom
（ 1. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2. Department of Mathematics, College of Changsha Communication Technology,Changsha 410015, China）
Abstract: A newly developed approach, in which sheet metal forming and plastics injection molding are integrated, was used to manufacture complex components combined with aluminum sheet and polypropylene with the mold of non-flat bottom via plastics injection molding machine. The updated elastic-plastic Lagrange finite element formulation was used to simulate the forming process of the aluminum sheet. The simulation results agree to the experiment. It is shown that three heavily strained regions were formed in the aluminum sheet. In the most heavily strained region Ⅱ, the deformation is in combination of stretching forming of the sheet and severe plastic shear. The second heavily strained region can be divided into zone B with negative major principal plastic strain and zone C with positive major principal plastic strain. The third largest strained region is in negative major principal plastic strain.
Key words: aluminum sheet forming; plastics injection molding; plastic deformation; finite element method
