Simulation of Cold Extrusion of Hollow Parts

Abstract

The finite-element method is used to study the effect of the design parameters of the die on the production of hollow brass parts by cold direct extrusion and expansion on a cone punch. The results are compared with data on conventional indirect extrusion. The elastic deformation and increase in the temperature of the metal during cold extrusion are taken into account. Intermediate and final shapes and dimensions of workpieces are determined by simulation. The dependence of the extrusion force on the tool displacement and the distribution of normal stress over the tool–workpiece contact surface under the maximum force is established. The stress-strain state of the workpiece during extrusion is determined. The distribution of stress intensity, strain intensity, and temperature over the deformed workpiece at the final stage of extrusion is plotted. Rational design parameters of a die for direct extrusion and expansion are proposed.