Aluminum is easy to bond with cemented carbide is the reason for the large axial thrust when cutting with uncoated cutting tools. Vertical milling is an intermittent cutting process. Since the cutting edge cuts only the workpiece in the 180 ° rotation range, there is little continuous chip breakage. In the case of dry cutting, uncoated end mills occasionally produce continuous chips, because a newly generated chip adheres to the surface of the chip flute. In the next new chip is pushed to it, basically with it after being washed away. Pfefferkorn said, “there must be enough force to make the chips push each other.”
Micro-milling test also found. Diamond-coated end mills are more regular and more uniform on the machined surface, while the surface finish of the m-coated tool is not uniform, indicating that a large amount of cutting heat is generated during the cutting process. Said Carpick. “The heat generated in the cutting has a great impact on micro-tools, especially in high-speed machining”
The research paper points out that these performance enhancements are only available if the durability of the diamond coating is long enough. Approximately 80% of the fine grain diamond coated tools and 40% of the nano-diamond coated tool have peeled off the coating, which usually occurs after a few minutes of cutting. The original coating tool after the peeling of the coating or exhibits a performance similar to that of the uncoated tool, or abruptly fails. therefore. The next step is to study how to improve the adhesion of the coating.