Title:
SURFACE-COATED CUTTING TOOL WITH HARD COATING LAYER EXHIBITING EXCELLENT CHIPPING RESISTANCE
Document Type and Number:
WIPO Patent Application WO/2018/066469
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a surface-coated cutting tool exhibiting excellent chipping resistance and peeling resistance under a deep-cut, fast-feed, high-speed intermittent heavy cutting condition in which a heavy load acts on the cutting edge. The present invention provides a surface-coated cutting tool in which a lower layer comprising a Ti compound layer including at least one TiCN layer and an upper layer comprising an α-Al2O3 layer are formed on a tool body surface, wherein when a distribution ratio of constituent atom sharing lattice point structures(units) of adjoining TiCN crystal grains in the TiCN layer is calculated using a field emission type scanning electron microscope and an electron backscatter diffraction imaging device, the grain boundary length for constituent atom sharing lattice point structures (units) of Σ31 and makes up at least 80% of the total grain boundary length of constituent atom sharing lattice point structures (units) of Σ3 and higher, and the area ratio of TiCN crystal grains having an aspect ratio of 3 or higher is 80% or higher.
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Inventors:
OKUDE MASAKI (JP)
NISHIDA SHIN (JP)
NISHIDA SHIN (JP)
Application Number:
PCT/JP2017/035466
Publication Date:
April 12, 2018
Filing Date:
September 29, 2017
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP (JP)
International Classes:
B23B27/14; C23C16/36
Foreign References:
| EP3000913A1 | 2016-03-30 | |||
| JP2007260851A | 2007-10-11 | |||
| JP2013166226A | 2013-08-29 | |||
| JP2009035802A | 2009-02-19 | |||
| JP2015231662A | 2015-12-24 |
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