Simulation of multi-hole die extrusion
Simulation of multi-hole die extrusion
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DOI：
10.1016/j.msea.2003.10.294
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发表时间：
2004-02
期刊：
影响因子：
6.4
通讯作者：
Z. Peng;T. Sheppard
中科院分区：
文献类型：
--
作者：
Z. Peng;T. Sheppard
当挤压异形型材时，通常需要的压力超过压力机的能力，如果挤压较短的长度或挤压锻件时生产率更高，则通常使用多孔模具。描述或分析这一过程的文献很少，尽管工业应用相当普遍。已报道的实验挤压大多涉及板材或棒材的平面或轴对称挤压。在考虑复杂形状或多孔模具时，关于压力要求或温度变化和材料流动的研究报道很少，尽管这些都是冲压机设计者和操作员的重要考虑因素。本文利用商用有限元软件FORGE3®研究了模孔数目和分布对挤压参数的影响。建立了流型、压力要求和温度历史曲线，有限元模拟结果与实验结果吻合较好。从这些模拟中得到了冶金行为(亚结构、再结晶晶粒度和再结晶分数)，并将其用作多孔构型最佳分布的判据。最后，将该结构与单孔模具挤压进行了比较。
When extruding shaped sections which would normally require pressures in excess of the press capacity, and where it is more productive to extrude shorter lengths or when extruding forge stock it is common to use multi-hole dies. The literature describing or analysing this process is sparse although the industrial application is quite common. The majority of experimental extrusion reported has been concerned with plane or axi-symmetric extrusion of sheet or rod. There are few studies reported concerning the pressure requirements or the temperature variations and material flow when considering complex shapes or multi-hole dies although these are important considerations to the press designer and to the operator. This paper reports the use of a commercial FEM code FORGE3®to study the influence of the number and the distribution of die holes on extrusion parameters. The flow pattern, pressure requirements, and temperature histories developed are established and it is clearly shown by the FEM simulations that agreement with experimental results is obtained. The metallurgical behaviour (the substructure, recrystallised grain size and the fraction recrystallised) is obtained from these simulations and is used as a criterion for the optimal distribution of the multi-hole configuration. Finally the structures are compared with extrusion through a single-hole die.