Cold extrusion process for spline gear of track brake

The invention relates to the technical field of spline gears, in particular to a cold extrusion process for a spline gear of a rail brake, which comprises the following steps: step 1, blank preparation: selecting a 20CrMnTi alloy steel bar, and sawing the 20CrMnTi alloy steel bar into a blank through a disc machine tool; the blank is put into a perforating machine, the center of the interior of the blank is perforated, and the blank is made to form an annular structure. In the manufacturing process of the spline gear of the track brake, the blank is cleaned through a liquid degreasing agent, oil stains which are not prone to being removed on the surface are removed, and a phosphating film can be attached conveniently; and then the blank is placed in a phosphate solution to be soaked, a phosphate coating is produced on the surface of the blank, the corrosion resistance of the spline gear of the track brake is improved, the friction reducing and lubricating effects are also achieved for subsequent procedures, a