Study of contact interaction of highcarbon wire and drawing die in the process of combined deformation

Abstract

Study of contact interaction of an instrument of a processed wire is an actual task, since the interaction controls the efficiency of the combined action on a material. Studies of peculiarities of contact interaction of Steel-70 grade high-carbon wire with a drawing die in the process of combined deformation by drawing with twisting. Analysis of factors, influencing the resource of drawing die workability was the purpose of the work. Values of radial stresses on the drawing die surface at the combination of drawing with twisting were obtained by a method of finite-element simulation. As a result of the simulation it was determined, that at the combined deformation of the wire by drawing and twisting, the values of radial stresses on the drawing die surface do not reach critical values. Calculation of estimation of average resource of the drawing instrument was accomplished for various modes of combined deformation. The results obtained indicate a high reliability and workability of the applied deformation instrument. It was shown by a method of optical metallography, that a white layer is formed on the surface of the high–carbon wire, which is not subjected to etching. Thickness of the layer depends on intensity of the combined deformation. Influence of the combined deformation by the drawing at various twisting speeds on mechanical properties of the Steel-70 grade high-carbon wire studied, peculiarities of micro-hardness gradient from the wire surface at various twisting speeds determined. The obtained results can be used for theoretical justification of peculiarities of the high-carbon steel behavior at the contact with conical deformation area drawing die at various modes of combined deformation by drawing with twisting.