Abstract
TiAlN has been widely used in cutting tool coating due to its excellent mechanical and thermal performances. However, the research on the TiAlN coating effect on cutting temperature is not comprehensive enough. In this paper, the friction tests at elevated temperature and hard machining H13 hardened steel tests are conducted by using TiAlN coated tools and uncoated tools, respectively. The results of using TiAlN coated tools are compared with those from using uncoated tools. It is found that the coefficient of friction (COF) between TiAlN coated tool and H13 hardened steel is reduced to 0.63 at 800 °C. The COF value is 0.75 for uncoated tool. Under the same cutting conditions, the TiAlN coating shortens tool-chip contact length. The tangential cutting forces and cutting zone temperatures are decreased with smaller COF and shorter tool-chip contact length. Due to the lower thermal conductivities of TiAlN coating and the Al2O3 oxide layer formatted at tool rake face, the cutting heat conducted into cutting tool substrate was reduced. The cutting temperatures in TiAlN coated tool substrate are decreased by at least 10.68% in this study. The TiAlN coating reduces the cutting temperature by decreasing the cutting heat generation and conduction.
Highlights
TiAlN coated tools have become a recent hotbed of discussion within the metal cutting field
Due to their excellent properties, TiAlN coated tools are often utilized in metal cutting processes under dry cutting conditions [1,2,3,4]
Uncoated and physical vapor deposition (PVD) TiAlN coated cemented carbide tools with the same geometries designated as NG3125R were used
Summary
TiAlN coated tools have become a recent hotbed of discussion within the metal cutting field. Both economical and environmental factors drive manufacturers to search for ways to avoid environmental pollution and high production costs. The application of hard coatings became popular in factories, especially TiAlN coating. Due to their excellent properties, TiAlN coated tools are often utilized in metal cutting processes under dry cutting conditions [1,2,3,4]. The high cutting temperature is still the main restraining factor for the application of TiAlN coated tools in the metal cutting process [7]
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