【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。更多还原

【Abstract】 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.更多还原