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摘要：
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采用刚粘塑性有限元法,利用Deform-3D有限元软件实现了铝合金CPU散热片导流模挤压过程的数值模拟。获得了挤压过程中材料的流动规律、挤压力、模具应力以及模具出口处流速的分布。通过数值模拟发现,型材出口流速很不均匀,远离型材中心的散热片齿部流速过慢。通过对导流模结构的调节,使得型材出口流速基本均匀,模具应力降低,提高了模具的使用寿命。模拟结果为导流模优化设计提供了依据。
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Based on the rigid-viscoplasticity finite element method,the pocket die extrusion process of CPU heat sinks was successfully simulated using Deform-3D software.The distribution of extrusion load,stress field and the velocity in the die exit and metal flow in the extrusion process were obtained.The simulation results show that the metal flow velocity in the bearing exit of the original die is non-uniform;especially the heat sink fins velocities of the outer profile are more slowly.Aiming at solving this problem,the uniform metal flow velocity in the bearing exit were obtained through modifying the pocket die structure,which also decreased the die stress and increased the die life.The simulation results provide the instruction for the pocket die design and optimization.
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基金项目：
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“十一五”国家科技支撑计划(2007BAE38B00)
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作者简介：
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参考文献：
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[1]李建湘,刘静安,杨志兵.铝合金特种管、型材生产技术[M].北京:冶金工业出版社,2008.
[2]刘静安.铝型材挤压模具设计、制造、使用及维修[M].北京:冶金工业出版社,1999.
[3]Hwang Y M,Shen C Y.Analysis of plastic flow and die de-sign during extrusion of CPUheat sinks[J].Journal of Ma-terials Processing Technology,2008,201:174-178.
[4]Gang Fang,Jie Zhou,Jurek Duszczyk.Effect of pocket de-sign on metal flow through single-bearing extrusion dies toproduce a thin-walled aluminiumprofile[J].Journal of Mate-rials Processing Technology,2008,199:91-101.
[5]Patrick Ulysse.Extrusion die design for flow balance usingFEMand opti mization methods[J].International Journal ofMechanical Sciences,2002,(44):319-341.
[6]Noorani Azad M,Bakhshi Jooybari M,Hosseinipour S J,etal.Experi mental and numerical study of opti mal die profile incoldforward rod extrusion of aluminum[J].Journal of Materi-als Processing Technology,2005,(164-165):1572-1577.
[7]Dyi Cheng Chen,Sheng Kai Syu,Cing Hong Wu,et al.In-vestigation into cold extrusion of aluminumbillets usingthree-di mensional finite element method[J].Journal of MaterialsProcessing Technology,2007,(192-193):188-193.
[8]杨云,董万鹏,王兆远.基于FEM的铝型材分流焊合挤压过程数值模拟[J].锻压技术,2007,32(6):165-167.
[9]高锦张,贾俐俐.宽截面铝型材挤压导流模应用研究[J].东南大学学报,2000,30(2):97-100.
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