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2024

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05

How to choose diamond coated cutting tools


Like any other cutting tool, the lifespan of stone carving knives varies, mainly depending on the material being cut, the selected feed rate and cutting speed, as well as the geometric shape of the workpiece. Generally speaking, the lifespan of diamond coated tools for processing graphite is 10-20 times that of uncoated hard alloy tools, and in some cases may even be longer. In this way, almost any machining task can be completed with a single tool without the need for tool replacement due to tool wear, avoiding machining interruptions and recalibration, making it possible to achieve unmanned machining. In the processing of composite materials, it is also entirely possible to achieve a longer tool life
The peeling of diamond coatings can prevent coating peeling, which is a serious and common problem for diamond coated cutting tools (especially when processing materials such as carbon fiber), and can lead to difficulty in predicting tool life. In the late 1990s, interface chemical properties were identified as an important factor affecting the adhesion performance of diamond coatings. By selecting chemical properties of hard alloys with good compatibility, adopting appropriate pre-treatment techniques, and reasonable deposition reaction conditions, it is possible to reduce or eliminate the peeling of diamond coatings and achieve stable wear patterns. Observing normally worn diamond coated cutting tools under a microscope, it can be observed that the diamond is steadily worn until the hard alloy matrix, without any blade breakage or peeling.