Actual Problems in Machine Building. Vol. 13. N 1-2. 2026 Technological Equipment, Machining Attachments and Instruments ____________________________________________________________________ 74 CONCEPTUAL APPROACHES TO THE DESIGN OF HYBRID TURNING MACHINES THAT INTEGRATE CUTTING OPERATIONS AND SURFACE HARDENING USING HIGH‑FREQUENCY INDUCTION HEATING Papko S.S., Post-graduate Student, junior researcher, e-mail: papko.2017@stud.nstu.ru Novosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian Federation Abstract The manufacture of a significant portion of mechanical engineering components requires a combination of machining operations followed by surface heat treatment. In current manufacturing practice, these operations are performed in geographically separate areas, which leads to increased positioning errors and a longer production cycle. This work is devoted to the development of conceptual approaches to the design of hybrid machine tools that combine, on a single machine base, a CNC turning and thread-cutting machine with operations of blade machining and surface hardening using high-energy high-frequency current (HEH HFC) heating. The feasibility of transitioning from a traditional discrete machining scheme to hybrid integrated technology is substantiated. Based on the theory of technological dimensional chains and the theory of positioning, a quantitative assessment of the reduction in total machining error was performed when eliminating intermediate re-positioning. A comparative analysis of concentrated energy sources was conducted, and the selection of HEH HFC technology for integration into the machine tool system was justified. Three alternative configurations of the working space were identified. The tasks of ensuring compatibility of cooling media, issues of electromagnetic shielding, and the need to expand the functionality of the CNC system were considered. A concept of modular architecture has been formulated, focused on retrofitting serial lathe equipment, and principles for creating a digital twin of a hybrid machine tool system within the context of the Industry 4.0 concept have been outlined. The results obtained provide a theoretical and methodological basis for the further design and experimental testing of next-generation hybrid metalworking systems. Keywords hybrid machine tools, integrated machining, high-frequency induction hardening, surface hardening, turning, modular design, dimensional chains, alignment error, digital twin, Industry 4.0.
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