| 任治国,石磊,刘爽,陈程阳.变通道转角挤压成形钼丝的有限元模拟研究[J].有色金属材料与工程,2019,40(3):16-20. |
| 变通道转角挤压成形钼丝的有限元模拟研究 |
| Study on Finite Element Simulation of Molybdenum Wire Formed by Unequal-channel Angular Pressing Technique |
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| DOI：10.13258/j.cnki.nmme.2019.03.003 |
| 中文关键词: 钼丝 变通道转角 挤压 有限元模拟 |
| 英文关键词:molybdenum wire unequal-channel angular extrusion finite element simulation |
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| 中文摘要: |
| 为了确定变通道转角挤压钼丝的工艺特征场的变量分布，通过有限元模拟和试验开展了以直径10 mm钼丝挤出直径6 mm钼丝的研究。试验验证了挤出过程中挤压力随行程的变化规律。分析了挤压速度对变形工件速度场的影响规律；分析了温度和等效应变的分布规律。结果表明：有限元模拟时最大挤压力的误差为9.20%；在通道转角处存在有梯度的增速区域和金属流动死区；通道转角区域的温度升高约100 ℃；挤出钼丝横截面上等效应变分布不均匀，刚性端的等效应变较小，其余部分上半区域的等效应变小于下半部分。 |
| 英文摘要: |
| In order to confirm the parameter distribution of processing characteristic field for molybdenum wire extruded by unequal-channel angular pressing technique, finite element simulation and experiment were carried out to study the extrusion from a molybdenum wire with diameter of 10 mm to the another one with diameter of 6 mm. The variation rule of extrusion force with the stroke during extrusion process was verified by experiment. The influence of extrusion speed on the velocity field of deformed workpiece was analyzed. The distributions of temperature and equivalent strain were analyzed. The results show that the error of maximum extrusion force is 9.20% in finite element simulation. There are gradient growth zones and dead zones of metal flow existing at the corner of the channel. The maximum rise of temperature is about 100℃ in the channel corner region. The equivalent strain is not uniformly distributed in the cross section of the extruded molybdenum wire. The equivalent strain is smaller at the rigid end. In the rest area, the equivalent strain in the upper half part is smaller than that in the lower half part. |
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