The Service of a Hard Coating on Cutting ToolThe Service of a Hard and Wear Resistant Coating Cutting Tool
Turning is a machining process in which a cutting tool, typically a non-rotary tool bit, while the workpiece rotates. The turning process requires a turning machine or lathe, workpiece, fixture, and cutting tool. In this process, several workpieces with different material are machined, so a specific material cannot be used for its tool. Cutting tools are classified to different categories according to their material and types of machining. Cutting tools should have higher hardness than workpiece. By developing materials that have high strength and high melting points, which are used in industries such as aerospace, automobiles, and turbine, harder material are required for machining. During this process, friction and heating production in cutting areas are common problem. The use of hard martial with proper properties such as wear resistance, chemical stability besides high hardness causes high production expenses. Regarding the issues mentioned above, hard coatings have been improved. Abrasive resistance, surface lubrication and oxidation resistance are the other properties expected from hard coatings. Common coatings include TiN, TiCN, TiAlN, and AlTiN. Each coating is used for specific applications. For instance, by adding carbon to TiN coating to produce TiCN, harder coatings will be achieved. For cases which no coolants exist, coatings with aluminum content are recommended.
Coatings for turning tools
Abrasion and corrosion resistant nanostructured coatings
Increment of hardness and abrasion resistance due to nanometric structure of coatings
Standard Date : 2018/08/30
Expire Date : 2018/08/29