Do you really know the common sense of using diamond tools? Before selecting and using diamond-coated tools, users must understand the following common sense about diamond-coated tools. The editor will inform you below.

　　(1) The difference between CVD diamond coating and amorphous diamond coating

　　Amorphous diamond (also known as diamond-like carbon-Annotation) coating is a carbon film deposited by the PVD process. It has both part of the SP3 bond of diamond and part of the SP2 bond of carbon; its film-forming hardness is very high, but it is lower than the hardness of diamond film; its thickness is also thinner than the diamond film we usually deposit. When processing graphite, the life of amorphous diamond-coated tools is 2-3 times longer than that of uncoated carbide tools. In contrast, CVD diamond is a pure diamond coating deposited by the CVD process. The tool life when processing graphite is 12-20 times that of cemented carbide tools, which can reduce the number of tool changes and improve the reliability and accuracy of processing. consistency.

　　(2) Hardened steel cannot be machined with diamond tools

　　Diamond is made of carbon atoms. When certain materials are heated, carbon atoms are extracted from the diamond and carbides are formed in the workpiece. Iron is one such material. When machining iron group materials with diamond tools, the heat generated by friction will diffuse the carbon atoms in the diamond into the iron, which will cause the diamond coating to fail prematurely due to chemical wear.

　　(3) Limitations of diamond tools

　　It is difficult to guarantee the quality of heavy-grinding and/or heavy-coated diamond-coated tools. Because the coating on the surface of the tool is pure diamond, it takes a long time to re-grind the tool with a diamond grinding wheel. In addition, a tool used to grow diamonds. The preparation process will change the chemical characteristics of the surface of the tool. Since the coating requires very fine control of this chemical characteristic, it is difficult to guarantee the effect of the re-coating of the tool.