Equivalent stress analysis of piercing process in Diescher's mill using Finite Element Method

In this paper, the simulation of the piercing process is performed by the three dimensional finite element method in Diescher's mill. After a short description of the problem the numerical model of the process is described. The simulated results visualize dynamic evolution of equivalent stress, especially inside the work-piece. The non-uniform distribution of stress on the internal and external surface of the work-piece is a distinct characteristic of processing tube piercing. And it is the basic data for improving tool and design, predicting, damage and controlling the micro-structural evolution of processing tube piercing.