Spinning tool for manufacturing large-groove-depth multi-groove large V-type spinning belt pulley

A spinning tool for manufacturing a large-groove-depth multi-groove large V-type spinning belt pulley comprises a core mold clamp, a forming wheel and a pre-forming wheel. The height Ht of a forming tooth of the pre-forming wheel is 9-13 mm larger than the width Hg of a product notch, and the length Lt of the forming tooth of the pre-forming wheel is 1-3 mm smaller than the depth Dg of the product notch; and Dg is greater than 25mm. The section shape of the working surface of the forming tooth consists of an upper bevel edge, a lower bevel edge and five sections of arcs for connecting the upper bevel edge and the lower bevel edge; rounds where two adjacent arcs are located are tangent. The five sections of circular arcs comprise two sections of circular arcs I R1, two sections of circular arcs II R2 and a circular arc III R3; the arc I R1 is tangent to the upper bevel edge or the lower bevel edge connected with the arc I R1; the radius of the circle where the first arc R1 is located is smaller than that of th