Abstract
Nickel-based superalloys such as Inconel 718 provide several advantages, including high-temperature strength and high corrosion resistance. Therefore, the demand for such materials has rapidly increased, particularly in the aircraft industries. On the other hand, they are known to be among the most difficult-to-cut materials due to their mechanical and chemical properties, and the tool life is extremely short. Recently, cubic boron nitride (CBN), which is the second hardest of all known materials, has received a great deal of attention as a material for cutting tools and has already established itself in many areas of cutting. However, the performance of CBN tools is still insufficient in practical use, especially in the high-speed machining of Inconel 718. To overcome this problem, we first conducted orthogonal cutting experiments on Inconel 718 in a wide range of cutting speeds (20–300 m/min) in order to identify the wear mechanisms of the CBN tool in continuous cutting operation. As a result, it was found that the micro-tool surface topography, such as grinding marks on the tool rake face, affected the progression of the crater wear of the CBN tool when the cutting speed was increased to over 100 m/min. Based on these results, we prepared several cutting tools with different surface topography and evaluated their cutting performances. The experimental results showed that the polished rake face reduced the initial crater wear by approximately 40 % compared to the non-polished tool.
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Sugihara, T., Takemura, S. & Enomoto, T. Study on high-speed machining of Inconel 718 focusing on tool surface topography of CBN cutting tool. Int J Adv Manuf Technol 87, 9–17 (2016). https://doi.org/10.1007/s00170-015-8006-1
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DOI: https://doi.org/10.1007/s00170-015-8006-1