The end of the shaft is annealed and heat treated using medium frequency induction annealing equipment

A shaft produced by a machinery manufacturing plant. After quenching and tempering heat treatment, the thread part of the shaft peeled off during use. Medium frequency induction annealing equipment needs to be used for annealing treatment. If the entire workpiece is placed in a furnace for heating and annealing, this will affect the mechanical properties of the entire workpiece. Therefore, it is required to heat and anneal only the threaded part of the shaft end. For this reason, induction heating was chosen, and an end medium frequency annealing equipment was designed and manufactured to conduct induction heating of only the threaded part of the workpiece. The required heating temperature is 800℃. The productivity is 4 pieces/min.

The entire end-end intermediate frequency induction heating annealing equipment mainly consists of three parts: intermediate frequency power supply, intermediate frequency transformer, and intermediate frequency heating device. Since the diameter of the threaded part at the end of the workpiece is M16mm, the current frequency of the selected intermediate frequency power supply is 8000HZ and the power is 50KW. The inductor is connected to the intermediate frequency power supply through an intermediate frequency transformer.

During the heating process of the workpiece, the workpiece is placed on each station of the rotating workbench. In actual production, the workpiece to be annealed is placed on the feeding device of the inductor, and the annealed workpiece is unloaded at the discharge end of the inductor. artifact. The sensor is fixed on the frame, and the upper and lower distance from the threaded part at the end of the workpiece can be adjusted. After passing through the reducer, the motor drives the disc worktable to rotate. The rotation of the worktable causes the workpiece to be heated through the inductor. The workpiece starts to rotate when it enters the inductor to ensure uniform heating temperature of the threaded part at the end of the workpiece. The workpiece does not rotate outside the inductor to facilitate loading and unloading of the workpiece.

The inductor used for heating the end of the workpiece is arc-shaped and has a single turn. It is made of a 20*30m rectangular copper tube. The outer surface of the pure copper tube is wrapped with asbestos rope and coated with water glass, which is both insulating and Acts as thermal insulation.