In mechanical manufacturing, it is usually necessary to use the principle of interference fit to assemble components. Therefore, the principle of thermal expansion and cold contraction needs to be achieved in the matching part to achieve the purpose. Induction heating is a method of rapidly heating workpieces to achieve interference fit. It is widely used in the assembly of motor rotor bearings, the assembly of construction machinery gears and shafts, and the assembly of elevator sprockets and shafts.