A die design model for thin section extrusions

Abstract

In an extrusion plant, the die design procedure is very often a trial-and-error process which requires a number of extrusion trials before reaching a satisfactory design. If the die is not corrected or tuned appropriately, the product may be twisted and warped. In this work, a model is proposed which should guide the preliminary design of extrusion dies. The model is focused on the distortions of the extruded product due to exit velocity variations. The die design model is limited to the extrusion of thin sections through solid dies. Since the die opening is assumed to be long and slender, asymptotic approximations have been used in the analysis. Some die design examples are discussed.