Surface Coated Cutting Tools

A cutting tool and surface coating technology, which is applied in the field of surface coating cutting tools, can solve problems such as insufficient adhesion strength

Active Publication Date: 2018-07-31
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a conventional coated tool is used under high-speed interrupted cutting conditions, the lower layer composed of a Ti compound layer constituting the hard coating layer and the layer composed of Al 2 o 3 Insufficient adhesion strength of the upper layer composed of layers

Method used

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  • Surface Coated Cutting Tools
  • Surface Coated Cutting Tools
  • Surface Coated Cutting Tools

Examples

Experimental program
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Effect test

Embodiment

[0076] As raw material powders, WC powder, TiC powder, ZrC powder, TaC powder, NbC powder, Cr 3 C 2 powder, TiN powder, and Co powder. These raw material powders are mixed with the compounding composition shown in Table 1, and paraffin wax is further added, and ball milled in acetone for 24 hours. In vacuum of 5 Pa, vacuum sintering is performed on the green compact at a predetermined temperature in the range of 1370-1470°C for 1 hour. After sintering, WC with the blade shape of ISO standard CNMG120408 is manufactured respectively. Carbide-based tool substrates A to E.

[0077] And, as the raw material powder, TiCN (TiC / TiN=50 / 50 in mass ratio) powder, ZrC powder, TaC powder, NbC powder, Mo 2 C powder, WC powder, Co powder and Ni powder, these raw material powders are blended with the composition shown in Table 2, wet mixed with a ball mill for 24 hours, after drying, they are stamped into compacts with a pressure of 98MPa, and pressed at 1.3kPa In a nitrogen atmosphere, th...

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Abstract

The invention provides a surface-coated cutting tool with a hard coating layer which exhibits excellent peeling resistance and chipping resistance in high-speed heavy cutting and high-speed intermittent cutting. The outermost layer of the lower layer of the hard coating layer comprises a predetermined oxygen-containing TiCN layer, the upper layer has an average layer thickness of 2 to 15 [mu]m and is formed by an Al2O3 layer with an [alpha]-type crystal structure in a chemical vapor deposition state. Among the individual crystal grains constituting the Al2O3 layer, the crystal grain with an aspect ratio less than 3 account for 60-90% of the total top layer at an area ratio, and an average particle size is in the range of 0.1 to 1.0 [mu]m. For the entire Al2O3 grains in the top layer, when a tilt angle formed by the normal of the plane is measured (0001), the total of Al2O3 grains in the inclination angle within the range of 0 to 10 degrees is more than 60% of the total frequencies in the tilt angle frequency distribution graph, the crystal grains in the average aspect ratio less than 3 has average orientation difference less than 5 degrees. Thus, the above problems are solved.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool (hereinafter, referred to as a coated tool) exhibiting excellent wear resistance over a long period of time. In this coated tool, the hard coating exhibits excellent peeling resistance even when cutting various steels or cast irons under interrupted cutting conditions in which high-speed intermittent and impact loads act on the cutting edge and resistance to chipping. Background technique [0002] In the past, it is known that there are usually substrates composed of tungsten carbide (hereinafter, represented by WC)-based cemented carbide or titanium carbonitride (hereinafter, represented by TiCN)-based cermets (hereinafter, these are collectively referred to as tool substrates). The coated tool is formed by vapor deposition on the surface of a hard coating layer composed of the following (a) and (b): (a) the lower layer is a Ti carbide (hereinafter, represented by TiC) layer, a nitride ( ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/40C23C16/34
Inventor 奥出正树山口健志
Owner MITSUBISHI MATERIALS CORP
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