Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 09, 2017 -
Recently, cutting has replaced grinding in the finishing process for hardened steel. However, tool damage is a major problem in high-efficiency operations that use high-speed cutting and high feed-rate conditions rather than the more conventional cutting conditions. Therefore, a new cutting technique that can realize high-efficiency cutting is desired. In our previous report, the processing efficiency was improved three to five times compared with conventional hardened steel cutting by driven rotary cutting. Furthermore, in order to attain high efficiency, the wear resistance and oxidation resistance of the tool material needs to improve. In the present study, the cutting performance of Al-rich coated tools, which improve oxidation resistance, was investigated for fast cutting-speed conditions. Based on the obtained results, the flank wear of the Al-rich tool was less than 50 μm for a fast cutting speed of 2.51 m/s, even for a cutting length of 10.0 km. Additionally, the Al-rich tool wear advanced progressively without flaking. On the other hand, conventional TiAlN-coated tools exhibited serious failure at cutting lengths of 3.0 km. It is thought that the difference in the oxidation resistance for the two tools influenced the cutting performance. Therefore, it is clear that the Al-rich tool can operate at high efficiency by increasing the cutting speed.
