PCD tools is made by welding PCD composite sheet to the carbide or steel tools body. Because the PCD composite sheet combines the high hardness, wear resistance, low friction coefficient and strength of crystal diamond with the high bending strength of tungsten carbide carbide, the tungsten carbide carbide layer of the composite sheet provides mechanical support for the diamond layer, increasing its bending strength. At the same time, the carbide layer is easy to weld, making it easy to make finished tools.

In recent years, with a large number of lightweight materials, such as aluminum alloy, composite materials, etc., the application of diamond tools has increased. PCD tools processing aluminum alloy, because of the high diamond hardness, the surface and metal affinity is small, and the tools front surface are polished into a mirror, not easy to produce debris nodules, processing dimensional stability and surface quality are very good. PCD tools processing of various specifications of aluminum alloy parts, tools life can reach thousands to tens of thousands of pieces, especially suitable for the mass production of automobile, motorcycle parts.

In China's automobile manufacturing industry, the application of PCD tools mainly cutting aluminum alloy engine cylinder block, cylinder head, transmission shell, valve body, tank body, side cover and other parts. PCD tools processing automotive aluminum alloy parts, can overcome the hard point in aluminum alloy to the damage of the tools tip, and the maximum possible elimination of debris, can obtain satisfactory processing effect, and the accuracy is stable. In addition, PCD tools is also widely used in other non-ferrous metal and non-metallic materials high-speed processing, is widely used in automotive, aerospace, electronics and wood processing and other fields.

PCD tools manufacturing method, including the following steps:

1) A mixture is provided to add to the mold for heating and pressurizing to obtain the PCD sheet;

2) The PCD sheet is pressed on the hard alloy base at high temperature to obtain the PCD composite sheet;

3) Cut the PCD composite sheet into several PCD inserts;

4) The upper surface of the tools matrix is coated with filler metal, the hard alloy base is placed on the tools matrix coated with filler metal and brazed to obtain the PCD tools, and the PCD tools is put into the vacuum furnace for slow cooling;

5) According to the design requirements of concave complex profile cutting tools edge, laser cutting device is used for laser cutting of PCD cutting tools;

6) Decobalting treatment of PCD layer: The method of dispersion coating is used to spray Teflon on the outer surface of parts other than the polycrystalline diamond layer. The coated PCD cutting tools is put into the cobalt-removing solution, and the cobalt-removing solution (including 20 ~ 40wt % sulfuric acid and 80 ~ 60wt % ammonium persulfate) is evenly stirred at a certain temperature for a certain time. Then take out the PCD cutter

PCD tools manufacturing process determines its cutting performance and service life, is the key to the development and application of PCD tools, PCD blade processing, including PCD composite cutting, blade welding and grinding steps. The traditional way to manufacture PCD cutting edge is to use grinding wheel and electric discharge machining. The grinding wheel used in the manufacture of PCD cutting tools edge is more expensive, and PCD material hardness is high, grinding difficult, no doubt to PCD cutting tools processing brings high costs; Electrical discharge machining out of PCD cutting edge quality is poor, the collapse situation is serious, even if the strict control of processing technology, collapse size ≥10μm, and electrical discharge processing of composite sheet surface damage is light, the surface is relatively flat, great influence on the internal organization, after processing tools prone to various use defects.