SURFACE COATING CUTTING TOOL - MITSUBISHI MATERIALS CORP

Title:

SURFACE COATING CUTTING TOOL

Document Type and Number:

WIPO Patent Application WO/2013/133251

Kind Code:

A1

Abstract:

A surface-coating cutting tool in which a hard covering layer having an average thickness of 2-10 µm is formed by deposition on a surface of a tool substrate comprising a tungsten-carbide-based superhard alloy, wherein the surface-coating cutting tool is characterized in that (a) the hard covering layer comprises a composite Al/Cr nitride layer, the ratio of the Cr content in the total amount being 0.2 to 0.5 (atomic ratio), and (b) the hard covering layer formed by deposition in the region of the surface-coating cutting tool from the blade edge on the relief surface of the tool substrate to a position set apart by 100 µm toward the side opposite the relief-surface blade edge on the relief surface has a particulate crystal structure, the average grain size of the particulate crystal grains on the hard covering layer formed in the above region being 0.2 to 0.5 µm. The average grain size of the particulate crystal grains on the boundary in the above region between the tool substrate and the hard covering layer is 0.02 to 0.1 µm smaller than the average grain size of the particulate crystal grains on the hard covering layer, and the diameter-length proportion of crystal grains having a grain size of 0.15 µm or less is no more than 20%.

Inventors:

SENBOKUYA KAZUAKI (JP)
TANAKA YUSUKE (JP)

Application Number:

PCT/JP2013/055924

Publication Date:

September 12, 2013

Filing Date:

March 05, 2013

Export Citation:

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Assignee:

MITSUBISHI MATERIALS CORP (JP)

International Classes:

B23B27/14; B23B51/00; B23C5/16

Foreign References:

JP2012024854A	2012-02-09
JP2009220260A	2009-10-01
JP2011218542A	2011-11-04
JP2011067883A	2011-04-07
JP2012030346A	2012-02-16
JP2003165003A	2003-06-10

Other References: