Research of the Stress State While Obtaining Tapered Flares on the Connecting Elements of Electrical Wires

It is shown that high requirements of mechanical strength, corrosion resistance and minimal losses at magnetization reversal during the passage of alternating current are imposed on the connecting elements of electric overhead lines. Sometimes the diameters of the wire ends are increased for the convenience of inserting them into connectors. In pressure treatment this process is known as dispensing. During dispensing the wall thickness of the edge sections decreases and, under certain conditions, destruction of the workpiece may occur in the form of a crack at the end. Besides, overestimated dispensing coefficients result in a loss of stability of the non-deformable part. To avoid these undesirable phenomena and reduce the production cost of tubular connecting elements, the authors of the paper analyze the factors that cause rejects during plastic deformation. It is shown that the yield point of the material and the shell thickness are the workflow main parameters that have a prevailing effect on the loss of stability of the non-deformable part of the workpiece. By changing them, it is possible to achieve the manufacture of high-quality connectors for electrical wires.