SURFACE-COATED CUTTING TOOL IN WHICH HARD COATING LAYER DEMONSTRATES EXCELLENT CHIPPING RESISTANCE AND EXCELLENT WEAR RESISTANCE IN HIGH-SPEED AND HEAVY CUTTING WORK

Japanese Patent JP2013146843

A

To provide a surface-coated cutting tool in which a hard coating layer demonstrates excellent chipping resistance and excellent wear resistance in the high-speed and heavy cutting work of a large black thickness-deviated component or the like.

In a surface-coated cutting tool, a lower layer composed of a Ti compound layer (here, a modified TiCN layer is essential), and an upper layer composed of a modified Al₂O₃ layer are coated on a surface of a tool base body. A ratio GBLa/Ta of a grain boundary length GBLa (μm) measured on the TiCN layer having a longitudinally-grown crystalline structure to the measured layer thickness Ta (μm) of the modified TiCN layer is 275-520. Furthermore, a ratio GBLb/Tb of a grain boundary length GBLb (μm) measured on the modified Al₂O₃ layer having a columnar structure to the measured layer thickness Tb (μm) of the modified Al₂O₃ layer is 40-165. Still furthermore, a value (GBLb/Tb)/(GBLa/Ta) is in a range of 0.1 to 0.6.

KONO KAZUHIRO

JP2012011083A

August 01, 2013

January 23, 2012

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MITSUBISHI MATERIALS CORP

B23B27/14; C23C16/30; C23C16/36; C23C16/40

JP2008168419A	2008-07-24
JP2007125686A	2007-05-24
JPH1015707A	1998-01-20
JP2009279693A	2009-12-03
JP2009184046A	2009-08-20

US20120015148A1	2012-01-19
US20070104945A1	2007-05-10
US20120144965A1	2012-06-14

Kageyama Shuichi
Masayuki Miyake
Kazuo Tomita

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