Evaluating the effectiveness of drawing methods with torsion in the manufacture of carbon wire with UFG structure

摘要

This article dicussed the methods that allow to get the wire with the UFG structure drawing with deformation torsion application . It is shown that in the rotating monolithic dies possible to change the coefficient of friction, which reduces the drawing force and redistribution of stresses in the wire. However, this is insufficient for structure refinement. Therefore, it was proposed the way of radial-displacement broach that creates in the center of deformation the powerful displacement deformation, that resulting in improved accumulated degree of deformation. Deformation is carried out with the help of a cassette of radial displacement broach , which is installed behind soap tray into place of die-head block that allowing it to set in the current wire-drawing equipment. The article presents the results of modelling in software complex Deform 3d in combination on route of the radial-displacement broach and the broaching through a monolithic dies. It is shown that the torsion effectively increases the cumulative degree of deformation, especially if the torsion implement reversely. Additionally, it was conducted a laboratory experiment. The wire steel grade Cт3 has been stretched from 6,69 mm to 6,00 mm diameter at a single pass through the cassette of radial-displacement broach, while the average tensile strength was 718 MPa, and the average yield strength was 701 MPa. Torsion during drawing through the cassette of radial-displacement broaching gives the increase tensile strength on 83 MPa and yield strength on 121 MPa at a single pass, compared with a monolithic die.