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Surface-coated cutting tool with excellent cutter breakage resistance by hard coating layer

A cutting tool and surface coating technology, which is applied in the field of surface coating cutting tools, can solve the problems of chipping and chipping of coating tools, short tool life, etc.

Active Publication Date: 2013-04-03
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Among them, the coated tool is prone to chipping and chipping under cutting conditions where a large load is applied to the cutting edge, resulting in a short tool life. Therefore, several proposals have been made so far in order to solve such a problem.

Method used

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  • Surface-coated cutting tool with excellent cutter breakage resistance by hard coating layer
  • Surface-coated cutting tool with excellent cutter breakage resistance by hard coating layer
  • Surface-coated cutting tool with excellent cutter breakage resistance by hard coating layer

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Embodiment

[0064] Prepare WC powder, TiC powder, ZrC powder, VC powder, TaC powder, NbC powder, Cr 3 C 2 Powder, TiN powder and Co powder are used as raw material powders, and these raw material powders are combined into the compounding composition shown in Table 1, and paraffin wax is added and ball milled in acetone for 24 hours. Predetermined shape of the green compact, and vacuum sintering of the green compact at a predetermined temperature in the range of 1370-1470 °C for 1 hour in a vacuum of 5 Pa. After sintering, implement R: 0.07 mm on the cutting edge Edge grinding processing was performed to manufacture tool substrates A to E made of WC-based cemented carbide having an insert shape specified in ISO·CNMG120412, respectively.

[0065] Furthermore, TiCN (TiC / TiN=50 / 50 by mass ratio) powder, Mo 2 C powder, ZrC powder, NbC powder, TaC powder, WC powder, Co powder and Ni powder are used as raw material powders, and these raw material powders are compounded into the compounding com...

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Abstract

The present invention provides a surface-coated cutting tool with excellent cutter breakage resistance and fracture resistance by a hard coating layer in high-speed intermittent cutting machining. The surface-coated cutting tool provided by the invention settles the task according to a technical solution which is characterized in that: the hard coating layer is composed of a lower layer and an upper layer which are treated by chemical vapor deposition; (a) the lower layer is Ti compound layer, the Ti compound layer at least comprises one Ti carbonitride layer and one layer or more than two layers of layers with a sum average layer thickness of 3-20 mu m; (b) the upper layer is an aluminum oxide layer with an average layer thickness of 1-25 mu m; at least one Ti carbonitride layer which constitutes the lower layer is provided with a cylindrical longitudinal-growing TiCN crystal tissue, and furthermore particle TiCn are dispersedly arranged in the tissue of the Ti carbonitride layer.

Description

technical field [0001] The invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool), which is used in high-speed intermittent cutting of various steels or cast irons with high heat generation and intermittent or impact loads acting on the cutting edge. The hard coating layer has excellent chipping resistance, thereby exhibiting excellent cutting performance over a long period of use. Background technique [0002] In the past, it is known that the surface of a tool substrate (hereinafter referred to as a tool substrate) composed of tungsten carbide (hereinafter represented by WC)-based cemented carbide or titanium carbonitride (hereinafter represented by TiCN)-based cermet is formed by A coated tool made of a hard coating composed of the following (a) and (b): [0003] (a) The lower layer is a Ti compound layer. The Ti compound layer is composed of a Ti carbide (hereinafter referred to as TiC) layer, a nitride (hereinafter also referred t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/00C23C16/30
Inventor 龙冈翔岩崎直之长田晃
Owner MITSUBISHI MATERIALS CORP
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