Sumitomo Electric Industries, Limited

A.l.m.t. Corporation

Sumitomo Electric Hardmetal Corp.

Takuya Kinoshita

Yutaka Kobayashi

Makoto Yukawa

Yoshiki Nishibayashi

Hitoshi Sumiya

Akihiko Ueda

Natsuo Tatsumi

Bunya Suemitsu

Kohichiroh Kimura

Kohei Kuramoto

Kentaro Shiro

Shigetoshi Sumimoto

A wire drawing dieincludes a non-diamond material, is provided with a die hole, and has a reductionand a bearingthat is positioned downstream of the reduction. A reduction angle γ which is an opening angle of the die holeat the reductionis less than or equal to 17°, and a surface roughness Ra of the die holewithin ±20 μm from a specific position inside the bearingin a circumferential direction of the die holethat is perpendicular to a wire drawing direction is less than or equal to 0.025 μm.

Wire drawing die

A diamond die includes a diamond provided with a hole for drawing a wire material, the diamond being a CVD single-crystal diamond, an axis of the hole being inclined relative to a normal direction of a crystal plane of the diamond.

Diamond die

Growing community of inventors

Sumoto, Japan

Takuya Kinoshita