Wenderoth, Lind & Ponack
Coated hard metal tool
 A cutting insert having excellent toughness as well as wear resistance is provided comprising a substrate consisting of a sintered hard metal or alloy such as cemented carbides and a coating film provided thereon consisting of a material having a higher hardness than the substrate, characterized in that the coating film near the cutting edge is continuously made thinner or removed toward both the rake face and flank face. 
Sumitomo Electric Industries, Ltd.
B B B C Y B B B B B B
B23P B23B B23B C23C Y10T B23B B23B B23B B23B B23P B23B
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Mitsunori Hiroshi Akio Yoshikatsu
Kobayashi Fujii Hara Mori