Design and development of streamlined extrusion dies a Bezier curve approach

Conventional shear dies used for extrusion of metals suffer from many problems. Attempts are made to improve the die design in many ways. Streamlined extrusion dies are considered to be better than shear dies. Streamlined extrusion dies are designed by various methods such as: (i) polynomial equation based dies (ii) area and line mapping technique (iii) analytical method. A new approach of designing streamlined dies using Bezier curve is attempted in this paper. Theoretical calculation on the total extrusion pressure for various friction factors is carried out. Comparison is made between Bezier curve based die and polynomial equation based dies. It is observed that the Bezier curve based die for the given takes lower extrusion pressure compared to other dies, for constant friction factor and area reduction.