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A surface coating cutting tool

A cutting tool and surface coating technology, applied in the field of surface coating cutting tools, can solve the problems of inability to increase the Al content X of the film, insufficient chipping resistance, insufficient adhesion strength, etc., and achieve reduced adhesion strength, Excellent abrasion resistance, the effect of reducing peeling resistance

Active Publication Date: 2015-08-05
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the coated tools described in the above-mentioned Patent Documents 1 and 2 are composed of (Ti 1-X Al X ) The hard coating layer composed of N layer cannot increase the Al content X in the film. Therefore, for example, when it is used for high-speed interrupted cutting of alloy steel, there is a problem of insufficient chipping resistance.
[0016] On the other hand, for (Ti 1-X Al X ) N layer, which can increase the Al content X, and can form a cubic crystal structure, so a hard coating layer with a specified hardness and excellent wear resistance can be obtained, but its adhesion strength with the substrate is insufficient, and its toughness is poor Therefore, when it is used as a clad tool for high-speed intermittent cutting of alloy steel, it is easy to produce abnormal damage such as chipping, chipping, and peeling, and it cannot be said that it can exert satisfactory cutting performance.

Method used

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  • A surface coating cutting tool
  • A surface coating cutting tool
  • A surface coating cutting tool

Examples

Experimental program
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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 pressed into a green compact of a predetermined shape with a pressure of 98 MPa, In a vacuum of 5 Pa, vacuum sintering is carried out on the green compact 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 is produced respectively. Tool substrates A to 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 compounded into the compound composition shown in Table 2, wet mixed by ball mill for 24 hours, after drying, press...

Embodiment 2

[0147] 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 10, and paraffin wax was further added, ball milled and mixed in acetone for 24 hours, dried under reduced pressure, and then stamped into a predetermined shape with a pressure of 98 MPa. The green compact is vacuum sintered in a vacuum of 5 Pa at a predetermined temperature in the range of 1370-1470°C for 1 hour. After sintering, the cutting edge is subjected to R: 0.07mm edge repair. Grinding, thereby manufacturing WC-based cemented carbide tool substrates α to γ ​​each having an insert shape according to ISO standard CNMG120412.

[0148] 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 material powde...

Embodiment 3

[0193] As raw material powders, cBN powder, TiN powder, TiCN powder, TiC powder, Al powder, Al 2 o 3 Powder, these raw material powders were blended into the blending composition shown in Table 16, wet mixed with a ball mill for 80 hours, dried, and then pressed into a green compact with a diameter of 50mm×thickness: 1.5mm with a pressure of 120MPa, and then 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 pre-sintered body for cutting blades. In the state where the WC-based cemented carbide support sheets having the composition of Co: 8 mass %, WC: the remainder, and the size of diameter: 50mm×thickness: 2mm are superimposed, they are loaded into an ordinary ultra-high pressure sintering device under ordinary conditions. , that is, pressure: 4GPa, at a specified temperature in the range of 1200-1400°C for 0.8 hours for ultra-high...

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Abstract

The invention provides a surface coating cutting tool. An average proportion X[avg] of A1 and an average proportion Y[avg] of C of a (Ti[1-X]A1[X])(C[Y]N[1-Y]) layer, of which film formation is realized through chemical evaporation with A1(CH3) as reaction gases on the surface of a substrate, wherein (Xavg and Yavg are both atomic ratios), satisfy 0.60<= X[avg]<=0.95 and 0<= Y[avg]<=0.005. Crystalline grains having cubic crystalline structures exist in crystalline grains forming complex nitrides or a layer of the complex nitrides. In measurement of distribution of degrees of inclination angles of an inclination angle between a normal of surfaces of crystalline grains (111) and the surface of the substrate, a degree ratio in a scope of 0-12 degrees is more than 45% of all the degrees. When a scanning electron microscope is used to observe organizations from the surface sides of the complex nitrides or the layer of the complex nitrides, the crystalline grains having the c cubic crystalline structures have triangular shapes in surfaces perpendicular to a layer thickness direction. A facet formed by an equivalent crystalline plane expressed by (111) of the crystalline grains accounts for an area proportion of more than 35% in the surface perpendicular to the layer thickness direction.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool in which a hard coating exhibits excellent chipping resistance in high-speed interrupted cutting of stainless steel or the like accompanied by high heat generation and an impact load acting on the cutting edge (hereinafter , called the wrapping tool). Background technique [0002] In the past, the following cladding tools are known, which are usually 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 TiCN) , represented by cBN) based ultra-high pressure sintered body (hereinafter, these are collectively referred to as the substrate) surface, coated by physical vapor deposition to form a Ti-Al composite nitride layer as a hard coating layer. Such a coated tool is known to exhibit excellent wear resistance, and is used in various application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/28C23C16/30
CPCC23C16/34C23C16/36
Inventor 龙冈翔佐藤贤一山口健志
Owner MITSUBISHI MATERIALS CORP
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