(1.中南大學(xué) 材料科學(xué)與工程系，長(zhǎng)沙 410083;
2.湖南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410082)
摘 要: 采用彈塑性大變形更新的Lagrange有限元方法研究了鋁板/塑料混合成型過程中鋁板的成形過程和變形特點(diǎn)。結(jié)果表明，當(dāng)塑料熔體壓力從30MPa增大到50MPa時(shí)，鋁板凸緣區(qū)已基本不再參與變形，鋁板上兩個(gè)板厚減薄較嚴(yán)重的大塑性變形區(qū)在此階段形成。模底接觸區(qū)與自由變形區(qū)交界處的大塑性變形區(qū)依次處于板料曲面內(nèi)雙向伸長(zhǎng)變形和平面應(yīng)變狀態(tài)；模腔入口圓角區(qū)與自由變形區(qū)交界處的大塑性變形區(qū)由兩部分構(gòu)成，其中與模壁接觸部分依次處于板料曲面內(nèi)雙向伸長(zhǎng)變形、拉伸變形和平面應(yīng)變狀態(tài)，另一部分依次處于板料曲面內(nèi)雙向伸長(zhǎng)變形和平面應(yīng)變狀態(tài)。
關(guān)鍵字: 金屬板料成形；液壓成形；塑料注射成型；有限元；鋁板
strained zones of formed aluminum
sheet by hyb rid forming of sheet
metal and plastic
（1.Department of Materials Science and Engineering，
Central South University，Changsha 410083，China；
2.College of Materials Science and Engineering，
Hunan University，Changsha 410082，China）
Abstract:The forming process and the deformation characteristics of the aluminum sheet during hybrid forming have been analyzed by the updated Lagrangian finite element method. The results show that the flange of the aluminum sheet has almost no any further deformation and that two highly strained zones with severe thickness reduction are developed when t he plastic melt pressure increases from 30MPa to 50MPa. The zone between the region contacted with bottom of the mould and the free forming region shows stretch forming and t hen transferred to plane strain state. Another zone between the mould entry region and the free forming region is constituted with two parts. One neighboring to side-wall of the mould shows stretch forming，and then transferred to deep drawing and finally to plane strain state，and the other shows stretch forming and then transferred to plane strain state.
Key words: sheet metal forming; hydroforming; plastic in jection molding;finite element method;aluminum sheet
