Method capable of improving precision of torsion bar shaft splines and product manufactured through method

The invention discloses a method capable of improving precision of torsion bar shaft splines. The method is characterized in that torque is transmitted to the middle segment of a torsion bar shaft, the torsion bar shaft is driven to rotate, a hobbing cutter of a dual-head gear machine tool is adopted for synchronously machining splines on two ends of the torsion bar shaft, before machining, coaxiality and circular runout of two ends of the torsion bar shaft are fine adjusted, the linearity and rigidity of the torsion rod shaft are improved, the machining precision of the splines of the two ends of the torsion rod shaft can be improved, the deviation of the splines of the two ends of the torsion bar shaft can be reduced, the precision level of the splines of the two ends of the torsion barshaft can be improved, the defect of deforming easily caused by gravity and torque transmission in a fine and long torsion bar shaft spline machining process can be overcome, stability of the torsionbar shaft in the spline ma