Machining method and forming die assembly for automotive threaded tooth long rod part

The invention belongs to the field of machining, and discloses a machining method for a threaded tooth long rod part for a vehicle, which can be used for preventing fine holes in the molded threaded tooth long rod part and fine cracks on the surface of the molded threaded tooth long rod part by enabling material flow to be unified during plastic deformation of materials in a compression molding process of the threaded tooth long rod part. The method comprises the following steps: firstly, quenching and tempering a long rod blank to form a quenched and tempered blank, and the grain size grade of the quenched and tempered blank is 5-6; then, the surface of the quenched and tempered blank is subjected to lubricating treatment to form a pretreated blank, and the viscosity value of a lubricating medium is 100 cSt to 150 cSt; and finally, the pretreated blank is rotated at the preset rotating speed, preset forming pressure is applied to the pretreated blank at the preset pressing speed, and therefore the pretreated