摘要
为了模拟研究CONFORM连续挤压过程中金属的变形行为,本文设计了一种专门的模拟实验装置,并利用莫尔云纹法研究了模拟实验时金属塑性变形的分布情况。研究结果表明,CONFORM连续挤压时的金属塑性流动不同于常规挤压时的情形,在塑性变形区内存在一个剧烈剪切变形带。剧烈剪切变形带的存在有助于减缓挤压塑性变形的不均匀性,尤其是对于金属颗粒挤压时,非常有利于增强颗粒之间的结合能力。
In this paper,the deformation behavior of the CONFORM(CONtinuous
extrusion FORMing)process has been studied by experimental simulation.In
the experimental arrangement,the frictional force can be taken for driving
force which makes metals plastic deformation through the die.A Moire
method is utilized for investigating the plastic flow of metals in the experi-
mental simulation.It is found that an Intense Internal Shear Band(IISB)
exists in the plastic deformation zone.The existence of the IISB can not only
mitigate the inhomogeneity of plastic deformation,but also can improve the
ability of plastic deformation of metals.
关键词
金属
挤压
变形
模拟
实验
extrusion
Moire method
shear strain
metal particles
