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采用上限方法开发了一种新的改进反挤压方法。在这个方法中,将变形区划分为4个不同的区域,然后对每个区的运动许可速度场进行了设定。对变形区的总耗散功和挤压功进行了计算。对一些重要的几何参数与挤压力和耗散功的关系进行了探讨。考虑到最小的相对挤压压力,通过上限方法获得了最优的坯料半径。同时,采用有限元法对问题进行了分析并与采用上限方法获得的结果进行了比较。最后,将上限方法和有限元方法的计算结果与工业纯铝的实验结果进行了比较,结果表明他们之间吻合较好。
A new improved anti-extrusion method was developed by using the upper limit method. In this method, the deformation zone is divided into four different zones, and then the permissible speed field for movement of each zone is set. The total dissipative work and work of extrusion in the deformation zone were calculated. The relationship between some important geometric parameters and squeezing force and dissipative work is discussed. Taking into account the minimum relative compression pressure, by the upper limit method to obtain the optimal blank radius. At the same time, the problem is analyzed by the finite element method and compared with the result obtained by using the upper bound method. Finally, the experimental results of the upper limit method and the finite element method are compared with the experimental results of industrial pure aluminum. The results show that the agreement between them is good.