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Surface-coated cutting tool

A cutting tool and surface coating technology, which is applied in the field of surface coating cutting tools made of cubic crystal boron nitride-based ultra-high pressure sintered materials, can solve the problems of short service life, insufficient adhesion strength between cBN tool substrate and hard film, and prone to defects and other problems, to achieve the effect of increased adhesion strength, excellent adhesion strength, and excellent wear resistance

Inactive Publication Date: 2011-04-20
MITSUBISHI MATERIALS CORP
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  • Claims
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Problems solved by technology

However, when it is used for high-speed interrupted cutting of high-hardness steel such as hardened steel, the adhesion strength between the cBN tool base and the hard film (wear-resistant film) is insufficient, so chipping is likely to occur, resulting in a long service life. Short, cannot exhibit sufficient wear resistance in long-term use

Method used

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Embodiment Construction

[0037]Hereinafter, the surface-coated cutting tool of the present invention will be described based on examples.

[0038] As raw material powders, cBN powder, TiN powder, AlN powder, TiC powder, TiCN powder, Ti 3 Al powder, Ti 2 Al powder, TiAl 3 powder, Al powder, Al 2 o 3 powder, Co powder, and WC powder, mix these raw material powders with the compounding composition shown in Table 1, wet mix them with a ball mill for 80 hours, dry them, and press them under a pressure of 120MPa to form pressed powders with a size of 50mm in diameter and 1.5mm in thickness Next, the green compact is sintered in a vacuum atmosphere with a pressure of 1Pa and at a specified temperature in the range of 900 to 1300°C for 60 minutes to form a pre-sintered body for cutting blades. The preliminary sintered body is placed in a normal ultra-high pressure sintering device in a state where the prepared sintered body is superimposed on a supporting piece made of WC-based cemented carbide with a dia...

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Abstract

The invention provides a surface-coated cutting tool which has excellent anti-defecting property and durability after long-time use, has excellent adhesive strength of a hard coated layer and is applied to high-speed interrupted cutting process of high-hardness steels such as quenched steels. The hard coated layer having excellent adhesive strength is formed by successively evaporating the surface of a cBN-base ultrahigh-pressure firing materials with high content of cBN so as to form a lower part layer made of amorphous BN layer with an average thickness of 0.1 to 0.3 microns, a middle layer made of TiBN with an average thickness of 0.1 to 0.3 microns and an upper part layer made of TiAlN with an average thickness of 1.0 to 2.0 microns.

Description

technical field [0001] The present invention relates to cubic boron nitride that exhibits excellent chipping resistance and wear resistance over a long period of time due to its excellent adhesion strength through a hard coating layer in high-speed interrupted cutting of high-hardness steel such as hardened steel (hereinafter referred to as cBN) based ultra-high pressure sintered material surface coated cutting tool (hereinafter referred to as cBN coated tool). Background technique [0002] Conventionally, it is well known that cBN-based ultra-high pressure sintered materials are used for tool materials with low affinity with the workpiece in the cutting of iron-based workpieces such as steel and cast iron. [0003] In addition, as described in Patent Document 1, it is known to use a cBN-based ultra-high pressure sintered material as a tool base (hereinafter referred to as a cBN tool base), and to form a metal element composed of elements selected from group 4a, 5a, 6a and A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/24C23C14/06
Inventor 高岛英彰高冈秀充
Owner MITSUBISHI MATERIALS CORP
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