基于伺服压力机的AZ31镁合金反挤压成形

为探讨挤压速度模式对AZ31镁合金杯形件反挤压成形的影响,对伺服压力机反挤压成形进行有限元分析与实验,并与普通曲柄压力机和液压机反挤压成形进行比较。有限元分析结果表明,反挤压终了阶段,伺服挤压和液压挤压最大损伤值分别为3.41和3.30,远低于普通挤压的最大损伤值6.08;挤压过程中杯形件最大温差伺服挤压为45℃,而普通挤压和液压挤压分别为127℃和70℃。实验结果表明,在1100kN伺服压力机上,采用伺服挤压模式,可成功获得壁厚为3mm的AZ31镁合金反挤压杯形件,而采用普通挤压模式,在杯形件边缘则出现破裂。实验与有限元分析结果基本吻合。

Research on backward extrusion for AZ31 magnesium alloy based on servo press

In order to explore the effect of the velocity mode on backward extrusion forming of AZ31 magnesium alloy cup,the finite element method and experiment were used to analyze the procedure on servo press,which was compared with the forming on ordinary crank press and hydraulic press.The results of finite element analysis indicated that the maximum damage of backward extrusion for servo press and hydraulic press at the final forming stage were 3.41 and 3.30 respectively,which were lower than 6.08 for ordinary crank press.The maximum difference temperature was only 45℃ for servo press,127℃ for ordinary crank press and 70℃ for hydraulic press.The experimental results proved that the backward extrusion cup of AZ31 magnesium alloy with the thickness of 3mm could be formed under the 1100kN servo press,while the fracture appeared at the flange under the ordinary crank press.The experimental results were agreed with the numerical results.