Abstract: In the extrusion of sections with flat-faced die, the proper design of die land is critically important in avoiding geometry defects. A methodology for the design of die land, which consists of a simulation-adjustment iteration, is proposed. The metal flow in extrusion is simulated by the three dimensional finite element method and the die land is adjusted according to the simulation result. The simulation-adjustment iteration is conducted repeatedly until the uniform metal flow in die land exit is obtained. Both the formulae for adjustment of the die land and the criterion for the judgment of proper die land are suggested. The extrusion of a C-section is chosen as the computational example.

Key words:  extrusion of sections; die design; finite element method (FEM)