The axial feed length of this design is greater than the radial feed length. Only the screws used for the axial feed structure are checked as follows:According to the design requirements, the weight of the worktable and the average working load of the lead screw electromagnetic fixture are installed on the worktable FM = 4000 n, the maximum axial stroke is 420 mm, the working length of the lead screw is 672 mm, and the effective runway length is estimated to be 500 mm. The maximum distance between the two brackets is 575mm, the average speed is 100r/m, the service life is LH = 15000h, the RA is 58-62hrc, the transmission accuracy is ±0.03mm, the screw material is 50Mn, high and medium frequency heating, and surface quenching. Nut material: CrWMn, full quenching, low temperature tempering. The commutator is made of 40Cr, the surface of the ion-nitriding threaded raceway is semicircular, and the nut is pre-tightened with a double nut washer.