Diamond cutting tools

Diamond, as single crystal or as a polycrystalline compact (PCD) is an excellent cutting material but is expensive and requires closely controlled speed and absence of chatter and vibration for optimum performance.PI It has limited oxidation resistance as it begins to oxidize in dry-grinding operations between 500 and 700°C, and the use of coolant is recommended to remain below these tern- 

Cubic boron nitride is obtained from hexagonal boron nitride at high pressure and temperature in the presence of lithium nitride as a catalyst. It is almost as hard as diamond and has superior chemical resistance and a much higher oxidation threshold.Efforts to 

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Diamonds Cutting tools, abrasives South Africa, Zaire 98... 

C (diamond) Cutting tools and wear-resistant coatings heat sink in laser diodes optical components... 

Figure 4. Natural diamond cutting tool machining a contact lens.

The following case studies are typical examples of where CVD diamond s performance is increasing the range of diamond cutting tool materials available to industry. 

Table 6 summarizes the relative merits of the three major diamond cutting tool materials - pcD, CVD diamond, and synthetic single crystal - as current technology stands, from the perspective of tool performance. 

It is clear that the various diamond cutting tool formats are largely complementary and, with the development of electrically conductive CVD diamond, the potential application areas of the machining of highly abrasive workpiece materials becomes a reality. 

Table 6. The relative merits of different diamond cutting tool materials tool performance.

It is widely accepted that the sharpness of the cutting edge of a diamond cutting tool directly affects the machined surface quality. Previous MD simulations show that the sharper the cutting edge is, the smoother the machined surface becomes. But this... 

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