Abstract
A theoretical analysis of the process of drawing a bimetallic wire. Theoretical dependences are obtained for determining the thickness of the shell at which its material loses stability and, as a result, leads to its expansion during drawing. The obtained dependences are new and allow one to determine by calculating a combination of indicators characterizing drawing processes without loss of stability, and, accordingly, expansion of the material of the cladding shell. The values of the die half-angles corresponding to the loss of stability during shell deformation are presented, depending on the degree of deformation, the friction conditions of the shell on the contact surfaces with the wire and core, and on the hardening index of the shell material. It has been established that with an increase in the degree of compression, friction coefficients, and the tendency of the sheath material to harden, the values of the fiber angles, the corresponding loss of stability of the sheath material, increase and, as a result, the tendency to swell of the sheath at the entrance to the working part of the wire when drawing a bimetallic wire increases.
Keywords
Bimetal wire, cladding sheath, resistance to deformation, non-contact deformation, half-angle die.