Diamond tool selection and use common sense

Before selecting households and the use of diamond coated tools , you must understand the following knowledge about diamond tools :( 1) The difference between the CVD diamond coated with amorphous diamond coatingAmorphous diamond ( also called diamond-like carbon - Annotation ) is to adopt a carbon PVD coating deposition process . It has a key part of the diamond SP3 , SP2 also has a part of the carbon bond ; its high film hardness, but lower than the hardness of diamond films ; their thickness than we usually deposited diamond film to be thinner . When machining graphite, amorphous diamond coated tool life is 2-3 times uncoated carbide tools . In contrast , CVD diamond deposition process is the use of pure CVD diamond coating , tool life when machining graphite is 12-20 times carbide cutting tools , which can reduce the number of tool changes to improve the reliability and precision machining consistency.( 2 ) can not be processed hardened steel with a diamond cutterDiamond is composed of carbon atoms. When some of the material is heated , it will absorb the carbon atoms from the diamond and carbide formation in the workpiece . Iron is one such material . When the iron group with diamond tooling materials, heat generated by friction causes the diffusion of carbon atoms in diamond to iron , resulting in diamond coatings by chemical wear and premature failure .
( 3 ) heavy grinding and ( or ) heavy coating of diamond coated tools is difficult to guarantee the quality of the tool surface is generated due to the pure diamond coating , so using a diamond grinding wheel to re- tool takes a long time . Furthermore, the growth of the diamond tool used . Preparation of the surface will change the chemical properties of the tool , since this requires very precise chemistry control coating , thus the coating effect is difficult to re- tool guaranteed .( 4 ) diamond coated tool life variesLike any other tool , diamond-coated tool life also varies , depending on the material to be cut , the choice of feed rate and cutting speed , as well as the geometry of the workpiece and the like. Generally , diamond-coated graphite machining tool life is 10-20 times uncoated carbide tools and may even longer in some cases . Thus , a tool can be done with almost any processing tasks without tool change due to tool wear and avoid the processing of the interrupt and recalibration , making it possible to achieve unattended processing. In the processing of composite materials , it is entirely possible to get a longer tool life.According to reports, in the processing of high-density glass fiber, carbon fiber and other difficult Gl0-FR4 composite materials , diamond-coated tool life up to 70 times the uncoated carbide tools .( 5 ) diamond coating can prevent flaking coating flaking is a serious problem in the diamond tool , but also a common problem ( especially when machining carbon fiber -like material ) , will cause unpredictable tool life . The late 1990s , the chemical properties of the interface has been identified as an important factor affecting the performance of the diamond coating adhesion . By selecting good compatibility Carbide chemical properties , the use of appropriate pretreatment technology and reasonable deposition reaction conditions , it is possible to reduce or eliminate the diamond coating flaking , worn smooth and stable pattern . Under the microscope normal wear diamond coated tool , you can find a diamond is worn until a stable carbide substrate , and no chipping or peeling occurs .