Modeling the heating of cylindrical items for removal from the shaft

For easy removal of cylindrical items from the shaft, they are heated on their external cylindrical surface for thermal expansion. The best result is obtained if the temperature drop is highest on the separation from shaft air layer. In the paper, considering a suddenly occurring constant high temperature on the external cylindrical surface of the homogeneous item and the shaft with the same thermal diffusivity as the item, the transient thermal field is analyzed and the optimal heating time for item removal and maximum temperature drop on separation layer are determined. Example is given as well.