Research of the drawing technology of rectangular profiles in the roller die with shift by roller couples

Instability of plastic flow in deformation zone during drawing of a round workpiece in four-roller draw die with roller couples shifted along drawing axis is experimentally found and analyzed. This instability was determined by the cross-section contour. Plastic flow on the surfaces contacting with deforming rollers has a wave character. Plastic deformation in two couples of rollers affects insignificantly the structure of copper and 37 % Zn brass, while the structure of deformed titanium is anisotropic. Distrbution of microhardness is very inhomogeneous both in initial and in deformed strips.