Papers by Author: Tadahiro Wada

Abstract: In the powder metallurgy method, after sintering, it is often necessary for the sintered steel machine parts to be machined by the metal removal process for dimensional accuracy. In this case, it is imperative that the tool materials have good wear resistance. Polycrystalline cubic boron nitride compact (cBN) seems to be an effective tool material because it has good heat and wear resistance. In this study, in cutting sintered steel with cBN tools, various cBN tools have been used in cutting experiments to identify an effective combination of binding phase and cBN content. As a result of experimentally examining the wear progress of the CBN tools, a cBN tool having a binder phase of (Al₂O₃-Al) and a cBN content of 60% was effective for wear resistance.

Abstract: To clarify the effect of using high-pressure coolant supply in combination with the intermittent cutting of hardened steel ASTM D2, intermittent cutting of hardened steel was performed with various sintered cubic boron nitride compact (cBN) tools. The result revealed that it was effective to use a high-pressure coolant supply method in combination for intermittent cutting of hardened steel. An effective tool material had a bonding phase of WC-Co-Al and a high content of cBN particles. Furthermore, the more suitable cutting edge shape was "a negative-land width of 0.13mm, a negative-land angle of 45°, and R honing of 0.04 mm".