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Title:
WC-BASED CEMENTED CARBIDE CUTTING TOOL HAVING EXCELLENT DEFECT RESISTANCE AND CHIPPING RESISTANCE, AND SURFACE-COATED WC-BASED CEMENTED CARBIDE CUTTING TOOL
Document Type and Number:
WIPO Patent Application WO/2020/196590
Kind Code:
A1
Abstract:
A WC-based cemented carbide cutting tool and a surface-coated WC-based carbide tool, wherein the component composition of the WC-based cemented carbide comprises 5-14 mass% Co and 0.1-1.4 mass% Cr3C2, the remainder being WC and unavoidable impurities, a plurality of maxima are present in the particle diameter distribution of WC particles when the particle diameter distribution is determined by measuring the particle diameters of the WC particles in a cross section of the WC-based cemented carbide, and when the particle diameter corresponding to the mode formed on a coarse particle side is r1, and the particle diameter corresponding to a mode formed on the fine particle side is R2, the particle diameter ratio r2/r1 is 0.15 to 0.60, and the area ratio A2 × 100/(A1 + A2) of WC particles having a particle diameter that is 0.50-1.20 times r2 in the total of the area A1 of WC particles having a particle diameter that is 0.75-1.20 times r1 and the area A2 of WC particles having a particle diameter that is 0.50-1.20 times r2 is 5-35 area%.

Inventors:
KAWAHARA KEISUKE (JP)
ICHIKAWA RYU (JP)
IGARASHI MAKOTO (JP)
OKADA KAZUKI (JP)
Application Number:
PCT/JP2020/013232
Publication Date:
October 01, 2020
Filing Date:
March 25, 2020
Export Citation:
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Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
B22F3/24; B23B27/14; C22C1/05; C22C29/08
Foreign References:
JPH08302441A1996-11-19
JP2005256076A2005-09-22
JPH09227981A1997-09-02
US20110315051A12011-12-29
JP2019057278A2019-04-11
JPS6256415B21987-11-25
JP2017088999A2017-05-25
JP2017148895A2017-08-31
JP2017179433A2017-10-05
JP4970638B22012-07-11
JPS605740B21985-02-13
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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