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聚碳酸酯板材多點(diǎn)熱成形數(shù)值模擬與成形精度分析
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歐盟第七框架協(xié)議計(jì)劃國際合作項(xiàng)目(FlexiTool-CT-2010-261925)


Numerical Simulation and Accuracy Analysis of Multi-point Thermoforming of Polycarbonate Sheet
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    摘要:

    提出了用于熱塑性聚合物板材的柔性成形技術(shù)——多點(diǎn)熱成形技術(shù)。根據(jù)高溫單向拉伸試驗(yàn)數(shù)據(jù)確定了不同溫度下聚碳酸酯(PC)板材的超彈性材料模型參數(shù)。運(yùn)用有限元軟件Abaqus對不同溫度和不同成形壓力下的PC板材多點(diǎn)熱成形過程進(jìn)行了數(shù)值模擬,結(jié)果表明:當(dāng)成形溫度與成形壓力分別為160℃和10kPa時,成形件平均形狀誤差最小。參照數(shù)值模擬結(jié)果進(jìn)行了PC板材的多點(diǎn)熱成形試驗(yàn),驗(yàn)證了數(shù)值模擬結(jié)果的準(zhǔn)確性。測量并分析了成形件的成形精度,結(jié)果表明:成形件具有較高的成形精度,可以滿足工程應(yīng)用需要。

    Abstract:

    A new flexible forming technique for thermoplastic polymer: multi-point thermoforming (MPTF) was developed. Polycarbonate (PC) is a typical thermoplastic polymer exhibiting many properties ideally. The material parameters of PC according to Mooney-Rivlin hyperelastic constitutive model were determined based on the high temperature tensile test data. The commercial software Abaqus was utilized to simulate the MPTF process of PC sheet. A series of numerical simulation results show that the best combination of forming temperature and forming pressure for PC sheet are 160℃ and 10kPa, respectively. MPTF experiments were carried out under the processing parameters which were determined by numerical simulations and the simulation results were validated by comparing them with the experimental results. The spherical and saddle-shape parts formed by MPTF were measured using a 3D sensing system and the measured data were compared with the target shape to analysis the accuracy of MPTF. The comparison results show that the formed parts have good accuracy.

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曹鋆匯,付文智,李明哲,劉純國,蘇世忠,Pham D T.聚碳酸酯板材多點(diǎn)熱成形數(shù)值模擬與成形精度分析[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2014,45(1):335-340. Cao Junhui, Fu Wenzhi, Li Mingzhe, Liu Chunguo, Su Shizhong, Pham D T. Numerical Simulation and Accuracy Analysis of Multi-point Thermoforming of Polycarbonate Sheet[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(1):335-340.

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  • 收稿日期:2013-06-10
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  • 在線發(fā)布日期: 2014-01-03
  • 出版日期: 2014-01-03