LAUSR

Abstract An internal gear ring for wind power generation is an important basic part of transmission mechanism for wind power generation. Hardening heat treatment is a key production process in the production of large gear rings. The problem of quenching hard and soft spots easily occurs in the gear ring at the inlet and outlet positions of the coil during the movement of the inductor. In this paper, an electromagnetic-thermal multi-field coupling prediction model was established with the coil movement factor being taken into account by analyzing the heat transfer process. With temperature nonuniformity being introduced as a measurable evaluation index, the laws of effect of the process of entry/exit of the inductor into/from the gear ring on this index were analyzed primarily. Comparison of the laws of distribution of electromagnetic field at the inlet, middle and outlet positions shows that it is possible to greatly reduce the temperature nonuniformity by changing the start and end positions of heating, thus to be favorable for improving the quality of heat treatment. The research results in this paper give a method and idea used as a reference for actively exploring relevant common problems in mobile electromagnetic heat treatment.