Vestnik of Samara State Technical University. Technical Sciences SeriesVestnik of Samara State Technical University. Technical Sciences Series1991-85422712-8938Samara State Technical University7215210.14498/tech.2021.3.2Research ArticleOptimization design and operating parameters of induction heat-ing system for hardeningPavlushinAleksey V.<p>Postgraduate Student</p>alex1995i79@gmail.comhttps://orcid.org/0000-0003-1645-5803Samara State Technical University13102021293385125062021Copyright © 2021, Samara State Technical University2021<p>The paper deals with the problem of optimizing the design and operating parameters of an induction heating system for surface hardening of a steel stepped shaft. The problem of optimal design of an inductor is formulated based on a nonlinear two-dimensional numerical model of coupled electromagnetic and temperature fields, developed in the ANSYS Mechanical APDL software. Alternance method of parametric optimization of systems with distributed parameters is used to optimize induction hardening system. MATLAB software has been used for developing parametric optimization subroutine, which was incorporated into the numerical ANSYS model to simulate a process of induction heating. Commonly used a multi-turn solenoid-style coil fabricated from rectangular copper tubing has been used as a hardening inductor. Besides that, an application of profiled copper turns has been investigated. Optimization of induction hardening system described above allows one to substantially improve heating uniformity and enhance metallurgical characteristics of as-hardened stepped shaft. Localized temperature surplus at an upper diameter shoulder has been minimized. At the same time, sufficient austenitization in the fillet area near stepped region (diameter transition) has been obtained.</p>numerical simulationalternance methodoptimal designinduction heatingsurface hardeningstepped shaftinduction hardeningelectromagnetic fieldtemperature dis-tributionANSYSMATLABчисленное моделированиеальтернансный методоптимальное проектированиеиндукционный нагревповерхностная закалкаэлектромагнитное полетемпературное распределениеANSYSMATLAB[Pavlushin A.V. Optimization of the process of induction hardening of metal blanks using a numerical ANSYS model // XIV International Youth Scientific Conference "Tinchurin Readings". In 3 volumes. V. Power engineering and electronics: mater. conf. (Kazan, April 23–26, 2019) / under total. ed. Rector of KSPEU E.Yu. Abdullazyanov. – Kazan: Kazan. state energ. un-t, 2019. – Part 2. – Рр. 21–30 (In Russian).][Pavlushin A.V. 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