Drawing die core is diamond wire drawing mould core part, in accordance with the materials can be divided into PCD (polycrystalline diamond drawing die core, CVD diamond wire drawing mould core and natural diamond drawing die core three categories.
PCD drawing die core
PCD also known as the common market of polycrystalline diamond, drawing die core models include SD, CXD and CXT three series. PCD brings great changes in the development of wire drawing industry, it makes the whole process more efficient and stable. PCD by micron sized diamond particles and the binder under the conditions of high temperature and high pressure sintering, has the advantages of high hardness, good wear resistance, impact resistance and strong, using the wire drawing die process embodies the advantages of uniform wear and long service life is in high speed drawing. Because of PCD in macro exhibits isotropic, so it does not like single crystal diamond that appear hole die wear is not uniform and the die hole Buyuan phenomenon. In addition, because the price of PCD is much lower than that of single crystal diamond, it is widely used in the wire drawing industry. At present, the vast majority of diamond wire drawing die using PCD drawing core.
According to the different binders, PCD cobalt base and drawing die core can be divided into two categories based on silicon. Cobalt based PCD drawing die core containing metal binding agent, has good workability, can use EDM, laser, ultrasonic etc. craft processing, but cobalt metal makes the diamond at high temperature is prone to graphitization, so the core for in less than 650 Celsius degrees under the conditions of processing and use. Silicon based PCD drawing die core processing is relatively poor, but the material without metal bond. Therefore, the material of the under 1000 degrees Celsius conditions can still maintain good thermal stability.
CVD diamond wire drawing mould core of CVD diamond also known as chemical vapor deposition of diamond, is a carbon containing gas in high temperature and low pressure, in solid substrate surface deposition and growth of pure diamond. CVD diamond has high hardness, good wear resistance, low friction coefficient, high surface smoothness, can be made into wire drawing die 0.02-1.0mm aperture, for drawing stainless steel wire, tungsten wire, molybdenum wire, copper wire, aluminum wire. Compared with PCD, CVD diamond wire drawing die has the advantages of high wear resistance, corrosion resistance, thermal conductivity and thermal stability compared with CVD. The disadvantage of this product is that it is not as good as PCD toughness, impact resistance is weak, easy to crack, wire drawing molding in the preparation of the technical conditions are more stringent than PCD.
Diamond wire drawing die
Diamond has high hardness, good wear resistance, the wire drawing die drawing wire surface is bright and clean degree is very high, but owing to the anisotropic structure, resulting in the hardness is anisotropic, the die hole uneven wear, the product is not rounded, combined with the scarcity of resources, the price is high and is generally used for surface quality requirements of the wire drawing die or finished guy mould. Diamond wire drawing die can be divided into two types: natural diamond core and artificial diamond wire drawing die.
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