Overview of the demagnetization principle: After the demagnetization treatment, the workpiece can be completely without magnetism and does not adsorb other ferromagnetic substances. Easy to clean, reduce the friction damage between the workpiece and the workpiece. Demagnetization can reduce the residual stress and increase the life of the workpiece. Demagnetization treatment technology is a new non-heat treatment of metal material properties. It uses alternating magnetic field technology to change the internal magnetic field distribution structure of the part, so as to achieve the purpose of demagnetization.