Experimental Verification of Dieless-Drawing Theories

Abstract

The dieless-drawing method is described briefly. Because of the strong thermo-mechanical coupling it is difficult to solve the underlying differential equations. Therefore several assumptions have been made to obtain simplified but nevertheless realistic models of the process. For an axi-symmetric cylindrical model the heat-conduction equation can be solved analytically and the radial dependency can be studied. For thin specimens a one-dimensional model is capable of predicting the most important parameters like axial temperature distribution and the final shape of the deformation zone. In contrast to conventional drawing the dieless-drawing method provides the possibility of producing variable cross-sections. The necessary control function is given for an example of a linearly varying final shape.