Issue. 20151217FZ002

Issue. 20151217FZ002

Publisher: EASTLEADS, Inc.


Topic: How to select the right drawing dies from diamond dies?

In the previous article, we talked about the selection of carbide dies and diamond dies according to the drawing diameters. However, when the diameter falls in the diamond dies range, we still have 3 options including natural diamond dies (ND), synthetic single crystal diamond wire (SSCD) and polycrystalline diamond (PCD). In this article, a comparison of these dies in different applications will be discussed.

Natural diamond dies (ND)-Natural diamond dies are good for wire drawing has diameter smaller than 2 mm. Natural diamond dies can draw up to 2.5 mms. In real industry, natural diamond is widely used for wires that is less than 0.15 mm. Impurities are often existed in natural diamonds though every ND dies manufacture told you that their diamond has no impurities. The shape of the natural diamond is irregular, which makes it very fragile in drawing procedures. However, Natural diamond dies can give wire the best surface smoothness, which make your wires stands out easily. Usually, natural diamond dies are used to draw wires that has high requirement on surface smoothness.

Synthetic Single crystal diamond wire dies (SSCD)-Single diamond dies can be taken as a replacement of Natural diamond dies when the requirement on surface brightness and smoothness are not at the top level. Compared with Natural diamond, manmade diamond can last 3 times longer but cost 50% less. It is a good cost saving strategy for wire manufactures. However, similar to natural diamond dies, single diamond dies have limited diameter range.

Polycrystalline diamond wire dies (PCD)-PCD dies now has more and more applications with the development of materials. PCD is harder than Carbide and softer than natural diamond, which can be taken as a compromise between them. It has wider diameter range than natural dies and single diamond dies, from 0.04mm to 35mm. For the high diameter range, PCD blanks are equipped with carbide rings to prevent burst during drawing. PCD has the lowest price compared with single diamond dies and natural diamond dies. For example, for stainless medical wire drawing from 0.5mm to 0.1mm, the cost of PCD dies is at least 1/4 of natural diamond in producing same amount of wires.

In a summary, the ranks of their performance are listed:


Fragility: ND>SSCD>PCD

Wire Surface Smoothness: ND> SSCD>PCD

From the list, we can see a lot of opportunities in reducing production cost by the combination of different types of dies in drawing line. We will discuss about the combined drawing lines that are currently used in wire industries in our next article.

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