OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 5 3 Fig. 2. Pattern of HEH HFC hardening of a punch type industrial installations [76–81], as well as the principles of convenient integration into a hybrid machine tool system, in our work we consider the use of high-frequency generators of the SHF-10 type with a power of 10 kW [7, 14, 61, 82]. The development of new methods for assigning processing modes, which will take into account the relationship between the combined operations of the technological process, is an urgent task. These technological recommendations should ensure the production of parts with a predetermined accuracy and certain physical and mechanical properties of its working surfaces [7, 14, 17, 47, 61, 71–75, 83]. The purpose of the work is to develop a methodology for assigning rational modes of HEH HFC hardening, which, under conditions of integral processing, increase productivity and reduce energy consumption during surface-thermal hardening of the working surfaces of the plug. To achieve this purpose, it is necessary to solve the following tasks: 1) to develop a structural analysis methodology that that enables an effective pre-project research in the process of developing hybrid metalworking equipment. This methodology should take into account the possibility of integrating a source of concentrated energy into a standard machine tool system. 2) practical testing of the equipment complex that implements the HEH HFC technology in order to prove the effectiveness of its manufacturing application. During the testing process, the effectiveness of the technology under study will be evaluated in accordance with the specified criteria. Methodology of experimental research The executive movements of the hybrid metalworking system (HMS) and the required number of its adjustable parameters were determined by applying the structural-kinematic synthesis of the mechanisms of metal-cutting equipment [14, 82, 84–87]. The main provisions of the structural synthesis and components of the systems under consideration, given in [14, 82, 84–96], were used to study the proposed structural composition and layout of HMS, in which surface heat treatment and mechanical operations are integrated. Materials and methods of full-scale experiments For full-scale experiments, a press brake plug (fig. 3) made of U10A steel (Table 1) was chosen. The composition of the starting material was determined on an ARL 3460 optical emission spectrometer. To determine the linear dimensions, taking into account the required thickness of the heat-strengthened layer, we used the theory of dimensional chains and the method presented in the relevant works [97, 98]. The experiments were carried out on a modernized multi-purpose machining center MS032.06, equipped with an additional energy source, which was a microwave thyristor-type generator SHF-10 with an operating frequency of 440 kHz, which implements high-energy heating by high-frequency currents. Structural studies of the samples were carried out using a Carl Zeiss Axio Observer Z1m optical microscope and a Carl Zeiss EVO 50 XVP scanning electron microscope equipped with an INCA X-ACT energy dispersive analyzer (Oxford Instruments). The microstructure of the samples was revealed using
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