Research of Electrical Discharge Machining Process of Wear Resistance Coatings Obtained By Beam Deposit Process

In modern mechanical engineering protective coatings are applied to improve the performance of the parts. The practical significance of the coatings is very high. External coating application can not only solve the problems for changing the physicochemical properties of the original surface, but also restore them after operation. Machining of such coatings on blade metalworking machines is often obstructing, and in combination with the small size of the reconstructed section of the part is impossible. Technologies of wire electrical discharge machining (WEDM) are applicable when machining parts of complex profile. This technology allows getting work pieces and parts of any type, regardless of their characteristics of resistance, without the use of additional tackle. Currently, the scientific basis of EDM process of reconstructed surface, the issues of accuracy and quality of treated surface of deposited machine parts are not fully explored. It is determined that the main factors affecting the formation of indicators of quality of machining of welded surface are the pulses characteristics (ton, toff) and physicomechanical properties of the treated material. The developed model calculates the surface roughness in the process of EDM of wear resistant coatings produced by the beam deposition method depending on the cutting modes (ton, toff) and physicomechanical properties of the material. Experimentally determined that in the wire electrical discharge machining process of U10 steel and welded material of 4H5MF1S steel with increasing electric power on the treated surface increases the thickness of the surface layer, wherein the microhardness of the layer is not changed. It is shown that in wire electrical discharge machining processing of steel U10 and welded material of 4H5MF1S steel shaped and modified surface layer does not affect the performance of produced parts.