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Surface-coated cutting tool in which hard coating layer exhibits excellent chipping resistance

一种切削工具、表面包覆的技术，应用在表面包覆切削工具领域，能够解决很难提高Al含有比例、韧性差、耐崩刀性充分等问题

Active Publication Date: 2017-02-22
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the coated tool described in Patent Document 1, since the hard coating is formed by physical vapor deposition, for example, it is difficult to increase the Al content in the hard coating. There is a problem that the wear resistance and chipping resistance cannot be said to be sufficient during continuous cutting, etc.
[0012] On the other hand, regarding (Ti 1-x Al x ) N layer, since the content ratio x of Al 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 the adhesion strength to the tool substrate is insufficient And the problem of poor toughness
[0013] In addition, the coated tool described in the above-mentioned Patent Document 3 has a predetermined hardness and excellent wear resistance, but has poor toughness, so chipping, chipping, and peeling are likely to occur when used for high-speed interrupted cutting of alloy steel, etc. There is a problem that it cannot be said that it cannot exhibit satisfactory cutting performance due to abnormal damage such as

Method used

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  • Surface-coated cutting tool in which hard coating layer exhibits excellent chipping resistance
  • Surface-coated cutting tool in which hard coating layer exhibits excellent chipping resistance
  • Surface-coated cutting tool in which hard coating layer exhibits excellent chipping resistance

Examples

Experimental program
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Effect test

Embodiment 1

[0069] WC powder, TiC powder, TaC powder, NbC powder, Cr 3 C 2 powder and Co powder. These raw material powders were mixed into the compounding composition shown in Table 1, and then paraffin was added and mixed with a ball mill in acetone for 24 hours. The blank is vacuum sintered under the condition of keeping the green compact at a specified temperature in the range of 1370-1470°C for 1 hour in a vacuum of 5 Pa. After sintering, WC-based cemented carbide with the blade shape of ISO standard SEEN1203AFSN is produced respectively. The tool substrates A~C made.

[0070] In addition, 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, stamping with a pressure of 98MPa Formed into a compact, the compact was sintered in a nitrogen atmosphere of 1.3kPa at a temperatur...

Embodiment 2

[0117] 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 10, and after adding paraffin, they were mixed in acetone with a ball mill for 24 hours. After drying under reduced pressure, press molding at a pressure of 98 MPa The shape of the compact is vacuum sintered under the conditions of maintaining the compact at a specified temperature in the range of 1370-1470°C for 1 hour in a vacuum of 5Pa, and after sintering, the cutting edge is given a cutting edge of R: 0.07mm Grinding process was carried out to manufacture WC-based cemented carbide tool substrates α to γ ​​each having an insert shape according to ISO standard CNMG120412.

[0118] In addition, TiCN (TiC / TiN=50 / 50 by 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 as raw material powders, an...

Embodiment 3

[0159] cBN powder, TiN powder, TiCN powder, TiC powder, Al powder, Al 2 o 3 Powder, these raw material powders were mixed into the compounding composition shown in Table 16, wet mixed with a ball mill for 80 hours, after drying, press-molded with a pressure of 120MPa to have a diameter: 50mm×thickness: 1.5mm The size of the green compact, Next, the green compact is sintered under the condition of maintaining a predetermined temperature in the range of 900 to 1300° C. for 60 minutes in a vacuum atmosphere with a pressure of 1 Pa to obtain a spare sintered body for cutting blades. The spare sintered body and Separately prepared Co: 8% by mass, WC: the composition of the remainder, and a WC-based cemented carbide support sheet having a size of diameter: 50mm×thickness: 2mm are superimposed and loaded into a normal ultra-high pressure sintering device, Under normal conditions, ultra-high pressure sintering is carried out under the conditions of pressure: 4GPa, temperature: 1200-1...

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Abstract

Provided is a surface-coated cutting tool in which a hard coating layer has excellent hardness and toughness and exhibits chipping resistance and defect resistance over a long period of use. The surface-coated cutting tool comprises a (Ti1-xAlx)(CyN1-y) layer (wherein the average content ratio Xavg of Al and the average content ratio Yavg of C satisfy 0.60<=Xavg<=0.95 and 0<=Yavg<=0.005) that is formed by coating the surface of a tool base body. The crystal grains of this layer have a NaCl-type face-centered cubic structure and a [111] orientation. The average particle width W of each of the crystal grains having a NaCl-type face-centered cubic structure is 0.1-2.0 [Mu]m and said crystal grains have a columnar structure in which the average aspect ratio A is 2-10. In addition, periodic compositional variation of the Ti and the Al is present in the compositional formula (Ti1-xAlx)(CyN1-y) within each of the crystal grains having a NaCl-type face-centered cubic structure. The difference [Delta]x between the average of the maximum values and the average of the minimum values of x, which varies periodically, is 0.03-0.25.

Description

technical field [0001] The present invention relates to a high-speed interrupted cutting process that is accompanied by high heat generation of alloy steel and the like 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, the following cladding tools are known: usually made of tungsten carbide (hereinafter represented by WC)-based cemented carbide, titanium carbonitride (hereinafter represented by TiCN)-based cermet or cubic boron nitride (hereinafter represented by cBN) ) based ultra-high pressure sintered body of the tool base (hereinafter referred to as the tool base) on the surface, by the physical vapor deposition coating to form a Ti-Al composite nitride layer as a hard cladding layer, and known These coated tools exhibit excellent wear resistance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/14C23C16/34C23C16/36
CPCC23C16/0272C23C16/34C23C16/36C23C28/042C23C28/044C23C28/42B23B27/14B23B27/148B23B2222/16B23B2222/28B23B2224/04B23B2226/125B23B2228/04B23B2228/105
Inventor 龙冈翔佐藤贤一山口健志
Owner MITSUBISHI MATERIALS CORP
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