|
摘要：
|
|
通过数值模拟和试验验证,揭示了带凸台套筒零件成形过程中金属流动的规律。结果表明:金属流动过程中体积不变,当金属流动空间逐渐增大时,金属沿平行于模壁,阻力最小方向流动;温挤压铝合金坯料时,金属黏度较大,外表面粘于模具,内部流动金属反作用于凸模,产生粘模现象。在一定范围内提高温度,减小挤压力,能够减小粘模现象的发生率。在合理的成形温度和模具设计条件下,可以实现套筒零件的良好成形。
|
|
Through numerical simulation and experiment,the general flowing law of metal in extrusion forming process of the tube with flange was revealed.The results show that volume remains the same during the process of metal flowing.When the space of metal flowing increases,the direction of metal flowing parallels with the mold wall where the resistance is the smallest.The metal becomes adhesive when extruding the billet below re-crystallize temperature.The out surface of metal sticks to the mold and the inside metal forces the top die,which leads to the wrapping phenomenon.The rate of wrapping phenomenon can be reduced by increasing the temperature and decreasing the extruding force.Via a proper billet temperature and the die-structure designing,the optimum forming of the tube can be delivered.
|
|
基金项目：
|
|
|
|
作者简介：
|
|
|
|
参考文献：
|
[1]刘静安,谢水生.铝合金材料的应用与技术开[M].北京:冶金工业出版社,2004.
[2]李尧.金属塑性成形原理[M].北京:机械工业出版社,2004.
[3]卡恰诺夫L M塑性理论基础[M].北京:人民教育出版社,1983.
[4]郝滨海,夏思淝,张勇,等.套筒扳头挤压成形过程的计算机模拟[J].热加工工艺,2001,30(4):45-46.
[5]刘静安.挤压模具型腔轮廓形状的多目标优化设计[J].锻压机械,2000,(4):41-44.
[6]李传民.DEFORM5.03金属成形有限元分析实例指导教程[M].北京:机械工业出版社,2007.
[7]Yang D Y,Park K,Kang YS.Integratedfinite clement si m-ulation for the hot extrusion of complicated Al alloy profiles[J].Journal of Materials Processing Technology,2001,111:218-221.
[8]Papakyriacou M,Mayer H,Fuchs U,et al.Influence of atmos-pheric moisture onslowfatigue crack growthat ultrasonicfrequen-cy in aluminium and magnesium alloys[J].Fatigue Fract.Eng.Mater.Struct,2002,217-221(25):795-804.
|
|
服务与反馈：
|
|
【文章下载】【加入收藏】
|
|
|
|
