A kinemfattically admissible velocity field for axisymmetric bar drawing through a hyperbolic die is established, and with the surface integral determining the friction power,and the upper limit function integral determining the internal deformation power, an upper bound analytical solution to the field is obtained.

The computer simulation of high precision tube drawing process;

The article simulates the processes of tube drawing when the mandrel's position is different in the deform zone by using the finite element analysis software of MSC.

It is put forward in this article that the cross section deformation index Q can be used to evaluate the inhomogeneity of deformation in tube drawing.