The invention discloses a
forging method of an automotive eccentric shaft, which comprises the steps of: a, pouring a cylindrical blank which contains the chemical components of, by weight percent: 0.23-0.40% of C, 1.5-2.0% of Mn, 0.6-0.9% of Si, 0.07-0.15% of Zr, 0.8-2.0% of Cr, 0.42-0.8% of W, 0.4-1.0% of Cd, 0.4-0.50% of Cu, equal to or less than 0.040% of P and equal to or less than 0.030% of S, cooling the poured blank to 300 DEG C, then heating to 650-760 DEG C, thermally insulating for 3-5 hours, furnace cooling to 300 DEG C, thermally insulating for 4 hours, heating again to 650-760 DEG C, thermally insulating for 17 hours, cooling to 400 DEG C at
cooling speed of 50 DEG C / hour and then cooling to 140 DEG C at
cooling speed of 20 DEG C / hour; b,
forging: 1, selecting
round bar steel with
diameter of 30 and blanking through a shear, with the length of the sheared rough blank is 70.3mm; and 2, heating the rough blank obtained in above step into a
medium frequency heating furnace at 1,120-1,180 DEG C for 3.6min. The
forging method is good for large scale industrial production of the automotive eccentric shafts, and reduces the problems of
slag inclusion and short shot in the forging process. The
mechanical property of the automotive eccentric shaft is further improved,
material consumption of the eccentric shaft is reduced and the service life of a die for forging the eccentric shaft is prolonged.