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Cutting tool

A cutting tool and cutting edge technology, which is applied in the direction of manufacturing tools, turning equipment, metal processing equipment, etc., can solve the problems of small content ratio, difficulty in obtaining toughness, limited hard phase, etc., and achieve improved toughness, improved defect resistance, Effect of improving thermal shock resistance

Active Publication Date: 2014-01-01
KYOCERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, as in the aforementioned Patent Document 1, in the method of creating a difference in the content of the binding phase between the surface and the interior to generate residual stress in the sintered cermet, since the content ratio of the binding phase to the entire cermet is small, the ratio of the binding phase to the entire cermet is small. Lack of sufficient residual stress, it is difficult to obtain a satisfactory effect of improving toughness
[0007] In addition, as in the above-mentioned Patent Document 2, in the method of uniformly applying residual stress to the hard phase, there is a limit to improving the strength of the hard phase.

Method used

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no. 1 approach

[0050] Here, according to the first embodiment of the present invention, when the residual stress is measured by the 2D method on the rake face 2 of the insert 1, the first hard phase 12 is parallel to the rake face 2 and from the center of the rake face 2 toward the The direction of the tool nose 5 closest to the measurement point (σ 11 direction) residual stress σ 11 〔1r〕Below 50MPa in terms of compressive stress (σ 11 [1r]=-50~0MPa), especially at 50MPa~15MPa (σ 11 [1r]=-50~15MPa), the residual stress σ of the second hard phase 13 11 〔2r〕Above 150MPa in terms of compressive stress (σ 11 〔2r〕≤-150MPa), especially at 150MPa~350MPa (σ 11 [2r]=-350~-150MPa). Thus, by applying compressive stresses of different sizes to the two types of hard phases, it is difficult for cracks to enter the grains of the hard phases 11, and the action of tensile stress between the hard phases 11 can be suppressed at the grain boundaries of the hard phases. Generation of a portion where cracks...

no. 2 approach

[0063] According to the second embodiment of the present invention, in the relief surface 3 below the cutting edge 4 of the insert 1, when the residual stress is measured by the 2D method on the surface of the cermet sintered body 6, it is parallel to the rake surface 2 and retracted. The in-plane direction of surface 3 (hereinafter referred to as σ 11 direction) residual stress σ 11 〔2sf〕Above 200MPa in terms of compressive stress (σ 11 [2sf]≤-200MPa), when the residual stress is measured by the 2D method on the ground surface (hereinafter referred to simply as the ground surface) after grinding from the surface of the cermet sintered body 6 of the relief surface 3 to a thickness of 400 μm or more, σ 11 The residual stress σ in the direction 11 [2if] 150MPa or more in terms of compressive stress (σ 11 〔2if〕-150MPa), absolute value specific stress σ 11 [2sf] Small, so constituted.

[0064] Thereby, a large compressive stress can be generated on the surface of the sintered...

no. 3 approach

[0071] The blade 1 of the third embodiment of the present invention is as Figure 6 As shown, a cermet sintered body is used as a substrate, and TiN, TiCN, TiAlN, Al 2 o 3 A well-known hard film, such as , is formed as the coating layer 7 .

[0072] Here, according to the present invention, when the residual stress is measured by the 2D method on the relief surface 3, the in-plane direction (σ 11 direction) residual stress (σ 11 〔2cf〕) 200MPa or more in terms of compressive stress (σ 11 [2cf]≤-200MPa), especially in the range of 200 to 500MPa, further in the range of 200 to 400MPa, relative to the σ of the second hard phase 13 of the sintered cermet 6 before the coating layer 7 is formed 11 Residual stress in direction (σ 11 [2nf]: corresponds to σ in the second embodiment 11 [2sf]) is 1.1 times or more, especially 1.1 to 2.0 times, further 1.2 to 1.5 times. By forming such a structure, a predetermined compressive stress can be applied to the surface of the cermet sinte...

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Abstract

Provided is a cutting tool which comprises a sintered cermet having high toughness and thermal shock resistance. The cutting tool, namely a tip 1, comprises a sintered cermet comprising: a hard phase 11 comprising one or more selected from among carbides, nitrides, and carbonitrides which comprise mainly Ti; and a binder phase 14 comprising mainly at least one of Co and Ni. The tip 1 has a cutting edge 4 lying along an intersecting ridge portion between a rake face 2 and a flank face 3, and a nose 5. The hard phase 11 comprises a first hard phase 12 and a second hard phase 13. When a residual stress is measured on the rake face 2 by 2D method, a residual stress à 11 [1r] of the first hard phase 12 in a direction (à 11 direction), which is parallel to the rake face 2 and goes from the center of the rake face 2 to the nose being the closest to a measuring point, is 50 MPa or below in terms of compressive stress (à 11 [1r]=-50 to 0 MPa), and a residual stress à 11 [2r] of the second hard phase 13 in the à 11 direction is 150 MPa or above in terms of compressive stress (à 11 [2r]‰¤-150 MPa).

Description

technical field [0001] The present invention relates to a cutting tool composed of a cermet sintered body. Background technique [0002] At present, as cutting tools, wear-resistant members, sliding members and other parts that require wear resistance, sliding properties, and chipping resistance, super hard alloys mainly composed of WC and cermets mainly composed of Ti (Ti-based metals) Sintered alloys such as ceramics) are widely used. For these sintered alloys, in order to improve their performance, the development of new materials continues, and for cermets, attempts are also made to improve their characteristics. [0003] For example, Patent Document 1 discloses that by reducing the concentration of the binder phase (iron group metal) in the surface portion of the nitrogen-containing TiC-based cermet compared to the inside, the ratio of the presence of the hard phase in the surface portion is increased, thereby making the sintered body 30kgf / mm remaining on the surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B27/14C22C29/04C22C1/05
CPCC22C29/02C22C29/04B22F2005/001C22C29/16C22C29/10Y10T428/25Y10T407/27Y10T428/252
Inventor 木下秀吉德永隆司
Owner KYOCERA CORP