Title:
CUTTING TOOL COMPRISING SINTERED BODY OF CUBIC BORON NITRIDE
Document Type and Number:
Japanese Patent JP2015193072
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a cutting tool comprising the sintered body of cubic boron nitride (cBN) exerting excellent defect resistance and chipping resistance in cutting of a high-hardness steel and exerting excellent cutting performance over a long term use.SOLUTION: There is provided a cutting tool comprising the sintered body including cBN particles and a binder phase as a tool base substance. The sintered body contains the cBN particle of 40 vol% or more but less than 60 vol%, and Al of 2 mass% as a lower limit and the range satisfying a relational expression: Y=-0.1X+10 as an upper limit when defining an Al content ratio (vol%) as Y and a cBN content ratio (mass%) as X. The binder phase contains at least a Ti-based compound, AlOand inevitable impurities, and the fine particles of AlOhaving the diameter of 10 to 100 nm generate and disperse in the binder phase. The fine particles of AlOof 30 pieces or more generate in the area of 1 μm×1 μm in the cross section of the binder phase.
Inventors:
YUMOTO NORIJI
MIYASHITA YASUSUKE
MIYASHITA YASUSUKE
Application Number:
JP2015058192A
Publication Date:
November 05, 2015
Filing Date:
March 20, 2015
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP
International Classes:
B23B27/14; B23B27/20; C04B35/583; C04B41/87; C04B41/89
Domestic Patent References:
| JPH0782031A | 1995-03-28 | |||
| JPH0881270A | 1996-03-26 | |||
| JP2013255986A | 2013-12-26 |
Foreign References:
| WO2010119962A1 | 2010-10-21 |
Other References:
J. ANGSERYD, M. ELFWING, E. OLSSON AND H.-O. ANDREN: "Detailed microstructure of a cBN based cutting tool material", INTERNATIONAL JOURNAL OF REFRACTORY METALS AND HARD MATERIALS, vol. Volume 27, Issue 2, JPN6011049434, March 2009 (2009-03-01), pages 249 - 255, ISSN: 0004005319
Attorney, Agent or Firm:
Kageyama Shuichi
Kurachi Yasuyuki
Kurachi Yasuyuki