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Features of the Structure Formation of the Machine Parts’ Surface Layer in the Conditions of Hybrid Processing

The object of these studies is the machine parts manufacturing process consisting of the following operations: pre-machining (rough and semi-finishing turning), surface hardening (high-energy heating by high-frequency currents) and finishing machining (finishing turning and diamond smoothing). We present the solution to the problem of quality forecasting in the conceptual design of hybrid process equipment. The developed methodology for substantiating the technical characteristics of machine tools based on mathematical simulation of its operating conditions provides the possibility of using automatic design systems at the initial stage of creating a general concept. We tested the developed design methodology and proposed a scheme for the implementation of hybrid metalworking process equipment based on the lathes. It is experimentally established that under the conditions of the developed hybrid processing it becomes possible to increase the surface microhardness of parts by 12-17 % and to increase the level of compressive residual stresses in the surface layer by 10-21 %.