The nano-diamond composite coating drawing die is based on cemented carbide (WC-Co) as the substrate, and chemical vapor deposition (CVD) is used to apply 

micro-level and nano-level diamond composite coating on the surface of the inner hole of the die. After precision grinding and polishing of the coating, a new mold

is obtained. The micro-nano composite coating on the surface of the inner hole not only has the characteristics of strong adhesion and good wear resistance of the 

micron diamond coating, but also has the advantages of high surface finish of the nano diamond coating, small friction coefficient and easy grinding and polishing.

The advantages for the CVD polycrystalline wire drawing die:

1) Drawn aluminum wire is more than 30 times that of cemented carbide die; drawn low carbon steel wire is more than 20 times that of cemented carbide die; drawn 

medium carbon steel wire is more than 30 times of cemented carbide die.

2) The aperture change when the mold is scrapped: 0.00 mm, free of mold repair.

3) The working surface has a high finish and remains unchanged.

4) High dimensional accuracy