PCD tools and PCBN tools mean

both polycrystalline diamond tools pcd tools
Polycrystalline diamond (PCD) cutting tools overview
PCD tool development
As a superhard diamond cutting tool materials have been used for hundreds of years of history. In the tool development process, from the nineteenth century to the mid

-twentieth century, high-speed steel tool material as the main representative; 1927 Germany developed the first carbide tool material

And is widely available; nineteen fifties, Sweden and the United States were synthesized diamond cutting tool with superhard materials from entering the representative

period. 1970s, people were synthesized using high pressure synthesis of polycrystalline diamond (PCD)

Address the number of rare natural diamond, expensive problems, make the diamond tool applications extended to aviation, aerospace, automotive, electronics, stone and

other fields.
The performance characteristics of PCD tool
Diamond tool with high hardness, high compressive strength, thermal conductivity and good wear resistance and other characteristics, can be obtained in a high-speed

cutting machining accuracy and processing efficiency. Above characteristics of diamond tools is determined by the state of the diamond crystal. In the diamond crystal,

the carbon

Atomic valence electron by four tetrahedral bond, each carbon atom with four adjacent atoms form a covalent bond, and then form a diamond structure, the structure is

very strong binding force and direction, so that the diamond has a very high hardness. Since polycrystalline diamond (PCD) of

Different structures are oriented fine grain diamond sintered body, although the added binding agent, the hardness and wear resistance is still lower than the single

crystal diamond. However, due to the performance of PCD sintered isotropic and therefore not split along a single cleavage plane.
  PCD cutting tool materials, the main performance indicators: ① PCD hardness up to 8000HV, is 80 to 120 times carbide; ② PCD thermal conductivity of 700W/mK, as

carbide 1.5 to 9 times, even higher than PCBN and copper Therefore PCD tool rapid heat transfer;

③ PCD friction coefficient is typically only 0.1 to 0.3 (the friction coefficient of carbide 0.4 to 1), so PCD tools can significantly reduce the cutting force; ④

PCD is only the thermal expansion coefficient of 0.9 × 10
  -6 ~ 1.18 × 10
  -6, Equivalent to only carbide 1/5, so the PCD tool thermal deformation, high precision; ⑤ PCD cutter and non-ferrous metals and non-metallic materials, the

affinity between the small chip in the process of bonding the knife is not easy BUE formed on the tip.
    PCBN tool both CBN cutting tools, CBN CBN (Cubic Boron Nitride) is first in the 1950s by the U.S. General Electric (GE) Company uses artificial means synthesized

under high temperature and pressure, and its hardness only to diamond The much higher

Other materials referred to as the Synthetic diamond so that it superhard material.
  CBN has high hardness, chemical inertness and high temperature thermal stability, so widely used as an abrasive CBN grinding wheel. As CBN tool materials with

properties superior to the other, so people start by trying to apply it cutting, but the single

CBN crystal particles is small, difficult to be made knives, and CBN sintered poor, difficult CBN sintered body made larger, until the 1970s, the former Soviet Union,

China, the United States, Britain and other countries have been successfully developed only As the CBN sintered body cutting tool - Polycrystalline

CBN PCBN (Polycrystalline Cubic Boron Nitride). Since then, PCBN cutting performance with its superior machinability applied in various fields, especially in high

hardness materials, cutting difficult materials processing is unique. After 30

Years of development and application, has now emerged for the processing of different materials, PCBN cutting tool materials.