bunching and stranding dies 1.wire diameter control accuracy, long service life 2.easy to get bright wire surface recommend to use tc or pcd painting dies recently, china has become a major country in the world for wire products. A mold widely used by rrl in the wire industry is a wire drawing die. The inner hole of the drawing die is composed of a cylindrical surface and a cone. The conical surface is the compression zone for the wire (workpiece), and the cylinder is the sizing zone (polishing zone) of the drawing die. The diameter lj corresponds to the size of the wire. The quality of wire drawing directly affects the shape, ruler, j, surface roughness and service life of the wire. The wire drawing die grinding process used in our country is the needle grinding process introduced from the soviet union in the early 1950s. The ij reliability of this process is not high, and the production efficiency is low.