Forming process and forming device of knurled tooth type supporting core and knurled tooth supporting core

The invention provides a knurled tooth-shaped supporting core forming process and device and a knurled tooth-shaped supporting core. The knurled tooth-shaped supporting core forming process comprises the steps that a wire is cut off to form a preset blank; reducing the diameter of the blank to form a first preset blank; then turning over and upsetting to form a second preset blank; the upper portion of the second preset blank is preformed into a first rod body, and a preset blind hole is formed in the first rod body; the preset blind hole is subjected to forward extrusion stretching, and a second rod body with the knurled tooth-shaped outer wall is preformed; the preset blind hole is subjected to forward extrusion stretching again, and a third rod body is preformed; a fourth rod body with the diameter smaller than that of the preset blind hole is formed at the end, away from the second rod body, of the third rod body. Punching waste materials in one end, deviating from the fourth rod body, of the preset blind