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Surface-coated cutting tool with rigid coating layer exhibiting excellent chipping resistance

A cutting tool and surface coating technology, applied in the direction of tools for milling machines, tools for lathes, manufacturing tools, etc. scale x etc.

Inactive Publication Date: 2018-01-19
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, in the coated tool described in the above-mentioned 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 it is difficult to increase the Al content x in the hard cladding layer. The problem that the wear resistance and chipping resistance cannot be said to be sufficient during continuous cutting
[0016] On the other hand, although the coated tool described in the above-mentioned Patent Document 2 has a predetermined hardness and is excellent in wear resistance, it has poor toughness, so it may be used for high-speed interrupted cutting of alloy steel, cast iron, stainless steel, etc. Abnormal damage such as chipping, chipping, and peeling is likely to occur, and it cannot be said to be a problem of satisfactory cutting performance
[0017] Furthermore, 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 is obtained, but there is an adhesive strength between the tool substrate Insufficient, and the problem of poor toughness
[0018] Moreover, the vapor deposition described in the above-mentioned Patent Document 4 is formed by (Ti 1-x Al x )(C y N 1-y ) represents a composite nitride layer or a composite carbonitride layer coating tool through the presence of periodic concentration changes of Ti and Al along the layer thickness direction in the crystal grains with the cubic crystal structure to generate in the cubic crystal grains Deformation to increase the hardness, and especially to suppress the crack propagation in the layer thickness direction, as a result, the chipping resistance and chipping resistance are improved, but there is a tendency to occur due to the shear force acting on the surface where the wear deepens during cutting. Insufficient suppression of crack growth in the direction parallel to the substrate

Method used

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  • Surface-coated cutting tool with rigid coating layer exhibiting excellent chipping resistance
  • Surface-coated cutting tool with rigid coating layer exhibiting excellent chipping resistance
  • Surface-coated cutting tool with rigid coating layer exhibiting excellent chipping resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] As raw material powders, WC powder, TiC powder, TaC powder, NbC powder, Cr, all having an average particle diameter of 1 to 3 μm are prepared 3 C 2 Powder and Co powder, these raw material powders are blended into the blending composition shown in Table 1, and paraffin wax is added, and then mixed in acetone with a ball mill for 24 hours. After drying under reduced pressure, it is pressed into a predetermined shape at a pressure of 98 MPa The compacts were vacuum sintered in a vacuum of 5 Pa at a predetermined temperature in the range of 1370 to 1470°C for 1 hour. After sintering, WC-based hard materials with the blade shape of the ISO standard SEEN1203AFSN were produced. Alloy tool bases A to C.

[0081] In addition, as raw material powders, TiCN (in terms of mass ratio, TiC / TiN=50 / 50) powder and Mo, each having an average particle diameter of 0.5-2μm, were prepared. 2 C powder, ZrC powder, NbC powder, WC powder, Co powder, and Ni powder. These raw material powders were mi...

Embodiment 2

[0140] As raw material powders, WC powder, TiC powder, ZrC powder, TaC powder, NbC powder, Cr, all having an average particle diameter of 1 to 3 μm are prepared 3 C 2 Powder, TiN powder and Co powder, these raw material powders are mixed into the composition shown in Table 10, and then paraffin is added, and then mixed in acetone with a ball mill for 24 hours. After drying under reduced pressure, it is pressed and molded at a pressure of 98 MPa. A green compact of a predetermined shape is vacuum sintered in a vacuum of 5 Pa at a predetermined temperature in the range of 1370 to 1470°C for 1 hour. After sintering, the cutting edge is subjected to R: 0.07mm edge The mouth is sharpened to produce WC-based cemented carbide tool bases E to G with the blade shape of ISO standard CNMG120412.

[0141] In addition, as raw material powders, TiCN (in terms of mass ratio, TiC / TiN=50 / 50) powder, NbC powder, WC powder, Co powder, and Ni powder all having an average particle diameter of 0.5-2 μm...

Embodiment 3

[0189] As raw material powders, cBN powder, TiN powder, TiC powder, Al powder, Al powder having an average particle diameter in the range of 0.5-4μm are prepared. 2 O 3 Powders, these raw material powders were blended into the blending composition shown in Table 16, and wet-mixed with a ball mill for 80 hours. After drying, they were pressed at a pressure of 120 MPa to form compacts having a size of diameter: 50 mm × thickness: 1.5 mm. Next, the green compact was sintered in a vacuum atmosphere of pressure: 1 Pa at a predetermined temperature in the range of 900 to 1300°C for 60 minutes to form a preliminary sintered body for cutting blades. Separately prepared Co: 8% by mass, WC: the composition of the remainder, and a WC-based cemented carbide support sheet having dimensions of diameter: 50 mm × thickness: 2 mm are placed in a normal ultra-high pressure sintering device while being superimposed, Under normal conditions, that is, under the conditions of pressure: 4GPa, temperat...

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Abstract

Provided is a coated tool including a rigid coating layer which, when used in high-speed intermittent cutting, has excellent chipping resistance and fracture resistance and exhibits excellent wear resistance over a long period. The rigid coating layer comprises a composite nitride or composite carbonitride layer represented by the empirical formula (Ti1-xAlx)(CyN1-y). The rigid coating layer includes crystal grains of the composite nitride or composite carbonitride which have an NaCl-form face-centered cubic structure and in which there are periodic concentration changes, the directions of theperiodic concentration changes at least include a direction that makes an angle of 30o or less with a plane parallel to the surface of the tool base. Preferably, the rigid coating layer has a columnar structure, the areal proportion of regions where there are periodic Ti / Al concentration changes is 40% by area or higher, the periods of concentration change are 1-10 nm, the difference between theaverage of maximal values of the Al content x that periodically changes and the average of minimal values thereof is 0.01-0.1, and at crystal grain boundaries, there are fine crystal grains of a hexagonal structure having an average grain diameter of 0.01-0.3 [mu]m, in an amount of 5% by area or less.

Description

Technical field [0001] The present invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool), which is used in the intermittent cutting process of alloy steel, cast iron, stainless steel, etc. accompanied by high heat generation and impact load acting on the cutting edge. The coating layer has excellent chipping resistance and peeling resistance and exhibits excellent cutting performance in long-term use. Background technique [0002] In the past, the following coating tools are known: usually made of tungsten carbide (hereinafter denoted by WC) based cemented carbide, titanium carbonitride (hereinafter denoted by TiCN) based cermet or cubic boron nitride (hereinafter denoted by cBN) ) The surface of a tool base composed of an ultra-high pressure sintered body (hereinafter, these are collectively referred to as a tool base) is covered by a physical vapor deposition method to form a Ti-Al composite nitride layer as a hard coating layer, and it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/14B23C5/16C23C16/36
CPCC23C16/36C23C28/044C23C30/005C23C16/45523C23C28/048C23C16/34B23C5/16B23C2228/10B23C2224/22
Inventor 柳泽光亮龙冈翔佐藤贤一山口健志
Owner MITSUBISHI MATERIALS CORP