In the drawing process of small wire, natural diamond drawing tools, polycrystalline diamond die and CVD coating die are commonly used as the wire drawing die 

materials. When drawing small-diameter wire, CVD coated diamond die overcomes the anisotropy of natural diamond die, and has excellent strength and hardness,

the highest drawing yield and surface quality. The test proves that the life of the CVD coated diamond wire drawing die is equivalent to that of the natural diamond

die, and the product yield is high, and the surface quality is superior to the domestic polycrystalline diamond. Therefore, for small-diameter wire drawing, CVD coated

diamond wire drawing die is an ideal choice. 

Although the drawing die can be used to process various metal and alloy materials such as steel, copper, tungsten, molybdenum, etc., the drawing die of different 

materials has its applicable processing range, and the wear form of the wire drawing die of different materials when the same wire is processed. There is a big difference

between the service life and the reason why the reasonable selection of the wire drawing material is the key to ensure successful application. Drawing die of different 

materials has relatively reasonable processing objects. The rationality of the drawing process mainly means that the mechanical, physical and chemical properties of the 

drawing die and the wire are matched to each other to obtain the longest die life. For example, when drawing a copper wire of the same diameter, the service life of the 

polycrystalline diamond mold is 300 to 500 times that of the tungsten carbide mold, and only 80 to 100 times when the nickel wire is drawn. When the molybdenum wire

is drawn, The service life is only 50 to 80 times of the life of the cemented carbide mold, and when the carbon steel is drawn, the life of the polycrystalline diamond mold 

is only 20 to 60 times that of the tungsten carbide mold.