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New PCBN for Heavy Interrupted Cutting of Hardened Steel
Okamura Katsumi,Kukino Satoru,Fukaya Tomohiro 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
PCBN tools are used worldwide for machining of hardened steel parts in automotive industries. But in heavy interrupted cutting of hardened steel, the tool life is not so stable by sudden breakage of the cutting edge, and total cost of cutting by PCBN is not so economical compared to the grinding. To solve this problem, new PCBN has been developed. New PCBN has very fine and homogeneous microstructure to increase the toughness of sintered body that it provides a reliable tool life for heavy interrupted cutting.
Kenichi Nagaoka,Akihiro Shimizu,Katsumi Ida,Katsunori Ikeda,Katsuyoshi Tsumori,Kazuo Toi,Keisuke Matsuoka,Kiyomasa Watanabe,Masaki Osakabe,Mikiro Yoshinuma,Mitsutaka Isobe,Osamu Kaneko,Shoichi Okamura 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
The characteristics of neutral beam driven current have been investigated in helical devices, which do not need ohmic current to produce a magnetic field configuration. The neutral beam current drive experiments have been performed in a wide range of Zb/Zeff in LHD and CHS. The Z dependence of neutral beam driven current in the region of Zb/Zeff < 1 obtained by neon discharges in LHD agrees with the Ohkawa model. On the other hand, the current driven by neon beam injection in CHS cannot be explained by the Ohkawa model.