Sumitomo Electric Industries, Limited

Matsushita Electric Industrial Co., Ltd.

Yuichiro Kohno

Akio Hara

Shuji Ueda

Kiyoji Aburaya

Nobuo Yasuhira

Makoto Abe

Seiji Nakatani

Makoto Kawanishi

A spiral end mill which can mill a substantially sharp inside corner of a work surface and attain a stable working accuracy for a long time. The spiral end mill has a hard sintered compact insert portion, a negative relief face a first circular land provided along the outer periphery of the insert portion, and a second circular land on the negative relief face so as to be continuous with the first circular land. The widths of the two circular lands may be the same as or different from each other, and the helix angle of a back line of the second circular land is less than that of the first circular land. A method of manufacturing the spiral end mill involves machining a relief angle in the outer periphery of the insert portion while changing the helix angle between the negative relief face and the rest of the outer periphery.

Spiral end mill and method of manufacturing the same

A stick of composite materials comprises a hot-pressed super-hard head member containing higher than 50 vol % of a diamond powder and/or a high pressure boron nitride powder, and a supporting member which is bonded at one of its ends with the hot-pressed super-hard head member. The stick of composite materials is characterized in that:

Stick of composite materials and process for preparation thereof

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Hyogo, Japan

Yuichiro Kohno