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Surface-coated cutting tools that exhibit excellent chipping resistance with hard coatings

A cutting tool and surface coating technology, applied in the field of surface coating cutting tools, can solve problems such as tool life that is prone to chipping

Inactive Publication Date: 2016-06-08
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned coated tool has problems such as chipping and the like being prone to occur under cutting conditions in which a large load is applied to the cutting edge, and the tool life is short. Therefore, in order to solve such a problem, several proposals have been made in the past.

Method used

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  • Surface-coated cutting tools that exhibit excellent chipping resistance with hard coatings
  • Surface-coated cutting tools that exhibit excellent chipping resistance with hard coatings
  • Surface-coated cutting tools that exhibit excellent chipping resistance with hard coatings

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Embodiment

[0060] 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 compact, and vacuum sintering of the compact in a vacuum of 5 Pa at a predetermined temperature in the range of 1370-1470°C for 1 hour. After sintering, implement R: 0.07mm 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·CNMG120408, respectively.

[0061] In addition, 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 composition show...

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Abstract

The present invention provides a surface-coated cutting tool with a hard coating layer exhibiting excellent cutter breakage resistance and fracture resistance in high-speed intermittent cutting machining. According to the surface-coated cutting tool provided by the invention, the hard coating layer is composed of a lower layer and an upper layer formed by chemical vapor deposition, wherein (a) the lower layer is composed of one or two Ti compound layers, the Ti compound layer at least comprises one Ti carbonitride layer and has 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 2-25 mu m; the Ti carbonitride layer of the Ti compound layer which constitutes the lower layer is provided with a cylindrical longitudinal-growing TiCN crystal tissue, and particle TiCn in bimodal particle size distribution pattern is present in the tissue.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool). In high-speed intermittent cutting of various steels or cast irons with high heat generation and intermittent impact load acting on the cutting edge, due to The hard coating layer has excellent chipping resistance, thus exhibiting excellent cutting performance after long-term use. Background technique [0002] In the past, it is known that the surface of a tool base (hereinafter these are collectively referred to as a tool base) formed on the surface of a tungsten carbide (hereinafter represented by WC)-based cemented carbide or a titanium carbonitride (hereinafter represented by TiCN)-based cermet. A coated tool composed of a hard coating layer composed of the following (a) lower layer and (b) upper layer. [0003] (a) Lower layer: It is a Ti compound layer, and the Ti compound layer includes a Ti carbide (hereinafter represented by TiC) layer, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B27/14C23C16/30
Inventor 龙冈翔岩崎直之长田晃
Owner MITSUBISHI MATERIALS CORP