【概要描述】Diamond tools as a common high-speed cutting tools, with high hardness, thermal conductivity and good wear resistance, and can obtain high machining accuracy and efficiency and other advantages are widely used in various industries, but some people on the main material of diamond tools, the corresponding field is still not particularly clear, today Hua Ling super hard combined with their own decades of diamond tool making experience to talk to you about the diamond tools of those things things~ Application fields of diamond tools Diamond tools are mainly divided into three categories: single crystal (SPDT) diamond tools, polycrystalline (PCD) diamond tools and chemical vapor deposition (CVD) diamond tools. 1、Single crystal (SPDT) diamond tools Single crystal (SPDT) diamond tools are mainly made of large grain single crystal diamond (quality greater than 0.1g, minimum diameter length not less than 3mm), mainly used in precision CNC turning and mechanical processing with high requirements for surface roughness, geometric accuracy and dimensional accuracy. Monocrystalline diamond is mainly divided into two types: natural monocrystalline diamond and synthetic monocrystalline diamond. Among them, natural monocrystalline diamond is the most wear-resistant material in diamond, the radius of blunt circle of cutting edge after fine grinding can be as small as 0.008～0.005μm. but natural monocrystalline diamond is more brittle, its crystal exists anisotropy, different crystal surface or the same crystal surface in different directions of the crystal hardness is different, so in grinding and use must choose the appropriate direction. In addition, due to the limited resources of natural single crystal diamond, the price is expensive natural single crystal diamond tools are mainly used for ultra-precision cutting of certain non-ferrous metals or the making of gold jewelry. And synthetic single crystal diamond has good consistency in size, shape and performance, and due to the increasing maturity of high temperature and high pressure technology, a certain size of single crystal diamond can be synthesized, so when processing high wear-resistant laminated wood, its performance is better than PCD diamond and will not cause premature blunting of the cutting edge. 2、Poly-crystalline diamond (PCD) tools Polycrystalline diamond (PCD) is a polycrystalline material made of polycrystalline diamond single crystal powder and cobalt and other metal bond at high temperature (about 1800 ℃) and high pressure (5 ~ 6 MPa) conditions. Although its hardness is slightly lower than that of single-crystal diamond, it is an isotropic aggregate of randomly oriented diamond grains. When used as a cutting tool, it can be ground in any direction. In addition, it does not require the selection of the best solution surface as the front cutting surface as in the case of natural diamond. When cutting, the cutting edge is insensitive to accidental damage and has high wear resistance. It can keep sharp cutting edge for a long time, and high cutting speed and large back cutting (depth of cut) can be used during machining, and its service life is generally 10~500 times that of tungsten carbide based carbide tools. 3、Chemical vapor deposition (CVD) tools CVD diamond is a high wear resistance pure diamond material without bonding agent, prepared at low pressure (<0.1MPa).CVD diamond mainly has two forms: CVD thin film coating (CD) and CVD thick film (TFD).CVD thin film coating is deposited on carbide substrate (commonly used K-type alloy) by CVD (chemical vapor deposition) process, the thickness is about 10~30 μm, which is composed of thin film-like polycrystalline diamond. Because the substrate is easy to make complex shapes, it is suitable for tools with complex geometry, such as taps, drills, end mills and indexable inserts with chip breakers.CVD thin film coated tools are mainly used for high-speed precision machining of non-ferrous and non-metallic materials, and the tool life is nearly ten or even tens of times longer than that of uncoated carbide tools. However, CVD thin film coated tools are not suitable for machining composite materials such as metals because the hard particles in the composite material will wear through a layer of coating on the tool surface in a very short period of time. Although the price of CVD film coated tools is lower than that of similar PCD tools, the low bond between the diamond film and the base material limits its wide application.