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在张力减径的工艺计算中,如何分配各架的减径量、减壁量及张力系数是个关键性问题。在张力减径过程中,金属的流动属于三维变形系统,减径量、减壁量和轴向张力几个参数相互联系,相互制约。因此,必须首先从理论上确定上述诸量之间的关系,方能正确进行张力减径的工艺计算。张力减径的变形理论比较多,但这些理论有一个共同的特点,即是都采用“张力系数”Z来描述张力减径变形过程中轴向张应力与诸变形量之间的关系,最有代表性的是Neuman、Hanck的理论。
In the process of tension reduction, how to distribute the reduction, reduction and tension coefficient of each frame is a key issue. In tension reducing process, the flow of metal belongs to the three-dimensional deformation system. The parameters of reducing volume, reducing volume and axial tension are interrelated and mutually restricted. Therefore, we must first theoretically determine the relationship between the above quantities, in order to correct the process of reducing tension calculation. There are many theories about strain reduction in tension reduction. However, these theories have a common characteristic that they all use the “tension coefficient” Z to describe the relationship between the axial tensile stress and the deformation in tension reduction and deformation. Representative is Neuman, Hanck’s theory.