Thermal dismantling method for nondestructive separating of gear and shaft, and implementing device thereof

The invention belongs to the technical field of machining and particularly relates to a thermal dismantling method for nondestructive separating of a gear and a shaft, and an implementing device thereof. The problem that when the gear and the shaft are dismantled through a conventional thermal dismantling method, parts of the gear and the shaft are extremely prone to being damaged is solved. According to the thermal dismantling method for nondestructive separating of the gear and the shaft, stains on the surface of a gear and shaft combined piece is removed clearly, and the gear and shaft combined piece is fixed to a worktable with hydraulic jacking rods; the gear is preheated firstly through a flame welding gun and then subjected to staged heating, during staged heating, the tooth root circle of the gear starts to be gradually propelled towards the center of the gear in a circle drawing mode in the radial direction of the gear, and the farthest end is heated to the one-third circulararc position of the divid