Title:
CUTTING TOOL AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2012/141171
Kind Code:
A1
Abstract:
The present invention provides a cutting tool which renders high-precision cutting possible. This cutting tool includes a cutting blade that is constituted of a polycrystalline object obtained from a nondiamond carbon material and/or boron nitride as a starting material by directly converting the starting material, through sintering, into high-pressure-phase rigid grains under ultrahigh-pressure high-temperature conditions without adding any sintering aid or catalyst, the rigid grains comprising one or more elements selected from the group consisting of boron, carbon, and nitrogen. The cutting tool is characterized in that when the radius of curvature of the tip of the cutting blade is expressed by R1, the sintered grains constituting the polycrystalline object have an average grain diameter of 1.2×R1 or less and a maximum grain diameter of 2×R1 or less.
Inventors:
TATSUMI NATSUO (JP)
YAMAMOTO KATSUKO (JP)
SUMIYA HITOSHI (JP)
YAMAMOTO KATSUKO (JP)
SUMIYA HITOSHI (JP)
Application Number:
PCT/JP2012/059778
Publication Date:
October 18, 2012
Filing Date:
April 10, 2012
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
TATSUMI NATSUO (JP)
YAMAMOTO KATSUKO (JP)
SUMIYA HITOSHI (JP)
TATSUMI NATSUO (JP)
YAMAMOTO KATSUKO (JP)
SUMIYA HITOSHI (JP)
International Classes:
B23B27/20; B23B27/14; B23P15/28
Domestic Patent References:
| WO2008088034A1 | 2008-07-24 |
Foreign References:
| JPH01106102U | 1989-07-17 | |||
| JP2009083052A | 2009-04-23 | |||
| JP2003291036A | 2003-10-14 | |||
| JP2003062707A | 2003-03-05 | |||
| JP2000042807A | 2000-02-15 |
Attorney, Agent or Firm:
SAKAI, Masami et al. (JP)
Masami Sakai (JP)
Masami Sakai (JP)
Download PDF:
Claims:
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