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Surface Coated Cutting Tools

A cutting tool and surface coating technology, applied in the field of surface coating cutting tools, can solve the problems of poor toughness, sufficient chipping resistance, peeling, etc., to achieve excellent wear resistance, and the effect of suppressing chipping

Active Publication Date: 2017-05-24
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, in the coated tools described in the above-mentioned Patent Documents 1 and 2, the film formed by the physical vapor deposition method is composed of (Ti 1-X Al X ) The hard coating layer composed of N layer cannot increase the Al content X in the film, so it cannot be said that the chipping resistance is sufficient when it is used for high-speed interrupted cutting of alloy steel, for example.
[0018] On the other hand, the (Ti 1-X Al X ) The N layer can increase the Al content X, and can form a cubic crystal structure, so that a hard coating layer with a specified hardness and excellent wear resistance can be obtained, but the adhesion strength with the substrate is not sufficient, and due to the toughness Poor, when used as a clad tool for high-speed interrupted cutting of alloy steel, abnormal damage such as chipping, chipping, and peeling is prone to occur, and satisfactory cutting performance cannot be said to be exerted
[0019] Moreover, when the coated tool described in the above-mentioned Patent Document 5 is used for continuous cutting of carbon steel, it shows a certain degree of adhesion and wear resistance. During high-speed interrupted cutting, etc., due to chipping, chipping, peeling, etc., satisfactory cutting performance cannot be exerted in long-term use.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0066] As raw material powders, WC powder, TiC powder, ZrC 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 and ball milled in acetone for 24 hours, dried under reduced pressure, and then pressed into a green compact of a predetermined shape with a pressure of 98 MPa. In a vacuum of 5 Pa, vacuum sinter the compact under the condition of maintaining a specified temperature in the range of 1370-1470°C for 1 hour, and after sintering, WC-based cemented carbide substrates A with the blade shape of ISO standard SEEN1203AFSN are produced. ~D.

[0067] In addition, TiCN (TiC / TiN=50 / 50 in mass ratio) powder, Mo 2 C powder, ZrC powder, NbC powder, TaC powder, WC powder, Co powder, and Ni powder. These raw material powders were blended into the compounding composition shown in Table 2, wet mixed with a ball mill for 24 hours, dried, and then dried...

Embodiment 2

[0115] As raw material powders, cBN powder, TiN powder, TiCN powder, TiC powder, Al powder, Al 2 o 3 Powder, these raw material powders were compounded into the compounding composition shown in Table 8, wet-mixed with a ball mill for 80 hours and dried, and then press-molded with a pressure of 120MPa to form a green compact with a size of diameter: 50mm×thickness: 1.5mm, and then The compact was sintered in a vacuum atmosphere of 1 Pa at a specified temperature in the range of 900 to 1300°C for 60 minutes to obtain a pre-sintered body for cutting blades. : 8% by mass, WC: remaining composition, diameter: 50mm×thickness: 2mm WC-based cemented carbide supporting sheets overlapped, put into a normal ultra-high pressure sintering device, under normal conditions, that is, at a pressure of 4GPa, 1200 ~ 1400 ℃ at a specified temperature in the temperature range of 0.8 hours to carry out ultra-high pressure sintering, after sintering, use a diamond grinding wheel to grind the upper a...

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Abstract

PROBLEM TO BE SOLVED: To provide a surface coated cutting tool coated with a hard coating layer providing excellent chipping resistance in high-speed intermittent cutting of an alloy steel and the like.SOLUTION: A surface coating cutting tool includes a base element surface coated with a hard coating layer formed in a cubic crystal structure of a (TiAl)(CN) layer (where each of X and Y is an atomic ratio as follows: 0.55≤X≤0.95, and 0.0005≤Y≤0.005) deposited by a chemical vapor deposition method using a reaction gas containing Al(CH)as a component, for example. The hard coating layer includes crystal grains in which when inclination angles, each of which is made by a normal direction of the base element surface with respect to a normal of a surface 100 in the crystal grain, are measured, a frequency ratio of the inclination angles within a range of 2 to 12 degrees in the whole of frequency in inclination angle frequency distribution is 45% or more. In addition, in a constituent atom common grid point distribution graph of the hard coating layer, a distribution ratio of &Sgr;5 is 10% or less in a base element boundary surface side, and there is the highest peak of &Sgr;5 in a coating layer surface side and a distribution ratio of &Sgr;5 is 30% or more therein.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool), in which the hard coating layer is used in high-speed intermittent cutting processing of alloy steel and the like accompanied by high heat generation and impact load acting on the cutting edge. Excellent chipping resistance. Background technique [0002] In the past, the following cladding tools are known, that is, 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) on the surface of the surface, coated with a Ti-Al composite nitride layer as a hard coating layer by physical vapor deposition, and They are known to exert excellent wear resistance. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/28C23C16/36
CPCB23P15/28C23C16/36C23C16/44
Inventor 龙冈翔五十岚诚岩崎直之山口健志长田晃
Owner MITSUBISHI MATERIALS CORP