Osypenko V. Physic-technological fundamentals of electro discharge wire cut

The dissertation is devoted to the development of physical and technological background of electro discharge wire cut (EDWC) by obtaining under conditions EDWC the solutions of the basic tasks of electro erosion processing, elaboration of the scientifically justified methodology of adequate prediction of the dynamic of development and effective refinement of the electrical, hydrodynamic, thermal and mechanical processes in an interelectrode interval (IEI) on the basis of the concept of reaching of maximal technological indexes of EDWC (productivity, accuracy, grain) at lowering common power consumption of the technology under operating the existing and designing of new equipment. By the result of the complex of experimental and theoretical researches carried out the new scientific statements concerning understanding of physical and technological conformities of natural laws of hydraulic fluid, formation and handle of parameters of highly concentrated source of heat on a surface of electrodes and thermal processes in an area of its operation are formulated. On the basis of new scientific statements the concept is proposed, basic technical solutions, and the control algorithms of the energy release are elaborated, and the experimental sample of new generator of impulses with two power blocks is created, the makes it possible to improve efficiency the efficiency and to lower the consumption of erosive corrupting of metals by small duration and energy discharges. The peculiarities of mechanisms of hydrodynamic processes in IEI at presence of impurities of surface-active substances (SAS) in water are researched, the influence SAS on the dynamic of the channel extension of spark discharge and conditions of heat exchange between a wire electrode and hydraulic fluid and, accordingly, the conditions of thermal condition of a local part of a wire are set.