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Surface coating cutting tool hard coating layer of which gives play to excellent anti-tipping performance

A cutting tool and surface coating technology, which is applied in the field of surface coating cutting tools, can solve the problems of insufficient substrate adhesion strength, wear resistance, insufficient chipping resistance, and insufficient chipping resistance, etc.

Inactive Publication Date: 2015-07-22
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] However, in the coated tool described in Patent Document 1, by (Ti 1-x Al x ) The hard cladding layer composed of N layer is formed by physical vapor deposition method, and the nitride phase such as Si is sandwiched in the hard cladding layer, so that the nanocrystals are dispersed in the TiAlN which has an fcc structure and grows in a columnar shape In the layer, the lattice strain of the nanocrystals occurs, and the hardness of TiAlN is increased through the dispersion strengthening mechanism, but the nanocrystals segregate at the grain boundaries, so for example, when used for high-speed interrupted cutting of alloy steel, there are wear resistance, resistance Issues of Insufficient Breakability
[0018] In addition, the coated tools described in Patent Document 2 and Patent Document 3 are intended to improve chipping resistance, wear resistance, and oxidation resistance, respectively. Issues of sexual inadequacy
[0019] On the other hand, regarding (Ti 1-x Al x ) N layer, the Al content ratio x can be increased, and a cubic crystal structure can be formed, so a hard coating layer having a predetermined hardness and excellent wear resistance can be obtained, but there is insufficient adhesion strength with the substrate, and, Less resilient subjects
[0020] In addition, although the coated tool described in the above-mentioned Patent Document 5 has a predetermined hardness and is excellent in wear resistance, it has poor toughness. Therefore, when it is used for high-speed intermittent cutting of alloy steel, etc., chipping, chipping, etc. are prone to occur. Unable to exhibit satisfactory cutting performance due to abnormal damage such as peeling

Method used

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  • Surface coating cutting tool hard coating layer of which gives play to excellent anti-tipping performance
  • Surface coating cutting tool hard coating layer of which gives play to excellent anti-tipping performance
  • Surface coating cutting tool hard coating layer of which gives play to excellent anti-tipping performance

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Effect test

Embodiment 1

[0091] As raw material powders, WC powder, TiC powder, TaC powder, NbC powder, Cr 3 C 2 powder and Co powder, these raw material powders were blended into the compounding composition shown in Table 1, and paraffin wax was further added, ball milled and mixed in acetone for 24 hours, dried under reduced pressure, and then punched into a green compact of a predetermined shape under a pressure of 98MPa , the green compact was vacuum sintered in a vacuum of 5Pa at a specified temperature in the range of 1370-1470°C for 1 hour. After sintering, WC-based cemented carbide with the blade shape of ISO standard SEEN1203AFSN were manufactured. Tool base A~C.

[0092] And, as the raw material powder, TiCN (TiC / TiN=50 / 50 by mass ratio) powder, Mo 2 C powder, ZrC powder, NbC powder, WC powder, Co powder, and Ni powder. These raw material powders are mixed into the compounding composition shown in Table 2, and wet mixed with a ball mill for 24 hours. After drying, they are stamped under a ...

Embodiment 2

[0145] 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 were blended into the compounding composition shown in Table 12, and paraffin wax was further added, ball milled and mixed in acetone for 24 hours, dried under reduced pressure, and then punched into a predetermined shape under a pressure of 98 MPa. The compact is vacuum sintered by keeping the compact in a vacuum of 5Pa at a specified temperature in the range of 1370-1470°C for 1 hour. After sintering, the cutting edge is subjected to R: 0.07mm edge grinding , thereby manufacturing tool substrates α-γ made of WC-based cemented carbide having an insert shape of ISO standard CNMG120412, respectively.

[0146] And, as raw material powders, TiCN (TiC / TiN=50 / 50 in mass ratio) powder, NbC powder, WC powder, Co powder, and Ni powder each having an average particle diameter of 0.5 to 2 μm were prepared, and these raw materi...

Embodiment 3

[0189] As raw material powders, cBN powder, TiN powder, TiCN powder, TiC powder, Al powder, and Al 2 o 3 Powder, these raw material powders were blended into the compounding composition shown in Table 20, and wet-mixed with a ball mill for 80 hours, after drying, they were punched under a pressure of 120 MPa to form a compact with a size of diameter: 50mm×thickness: 1.5mm, Next, the green compact was sintered in a vacuum atmosphere at a pressure of 1 Pa and kept at a predetermined temperature in the range of 900 to 1300° C. for 60 minutes to produce a pre-sintered body for a cutting edge. Separately prepared with Co: 8% by mass, WC: the rest of the composition, and diameter: 50mm x thickness: 2mm WC-based cemented carbide supporting sheet superimposed state, put into a normal ultra-high pressure sintering device, in Usual conditions are pressure: 4GPa, temperature: 1200-1400°C and holding time at a specified temperature: 0.8 hours for ultra-high pressure sintering. After sint...

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Abstract

The subject of the invention is to provide a surface coating cutting tool a hard coating layer of which has excellent hardness and toughness and gives play to anti-tipping performance and defect-resistant performance. The hard coating layer contains a composite nitride represented by a compositional formula of (Ti<1-x-y>Al<x>Me<y>)(C<z>N<1-z>) or a layer of the composite nitride, wherein Me is an element selected from Si, Zr, B, V and Cr, the average contained proportion Xav of Al, the average contained proportion Yav of Me, the average contained proportion Zav of C meet 0.60<=Xav<=0.95, 0.005<=Yav<=0.10, 0<=Zav<=0.005 and Xav+Yav<=0955, the Xav, the Yav and the Zav are atomic ratios; and the layer at least contains cubic grains and has a granular structure the average particle width W of the cubic grains of which is 005-1.0[mu]m and the average aspect ratio A of which is lower than 5, and specified-period concentration changes of Ti, Al and Me exist in the cubic particles, so the subject is solved.

Description

technical field [0001] The present invention relates to a high-speed interrupted cutting process of alloy steel and the like that is accompanied by high heat generation and impact load acts on the cutting edge. The hard coating layer has excellent chipping resistance and is excellent in long-term use. A surface-coated cutting tool with cutting performance (hereinafter referred to as a coated tool). Background technique [0002] In the past, it is known that ultra-high pressure sintered bodies made of tungsten carbide (hereinafter represented by WC)-based cemented carbide, titanium carbonitride (hereinafter represented by TiCN)-based cermets or cubic boron nitride (hereinafter represented by cBN) The surface of the formed matrix (hereinafter these are collectively referred to as the matrix) is covered by a physical vapor deposition method to form a Ti-Al system composite nitride layer as a coating tool for the hard coating layer, and it is known that these coating tools play ...

Claims

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Application Information

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IPC IPC(8): C23C16/34C23C16/36C23C16/44B23B27/00
Inventor 龙冈翔山口健志
Owner MITSUBISHI MATERIALS CORP
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