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Surface coating cutting tool with hard coating layer playing excellent fracture resistance

A cutting tool and surface coating technology, which is applied in the field of surface coating cutting tools, can solve the problems of defective tool life and easy chipping

Inactive Publication Date: 2013-05-08
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the above-mentioned coated tool has problems such as chipping, chipping, etc., which are likely to occur under cutting conditions where a large load is applied to the cutting edge, and the tool life is short. Therefore, several proposals have been made so far in order to solve this problem.

Method used

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  • Surface coating cutting tool with hard coating layer playing excellent fracture resistance
  • Surface coating cutting tool with hard coating layer playing excellent fracture resistance
  • Surface coating cutting tool with hard coating layer playing excellent fracture resistance

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Embodiment

[0064] Prepare WC powder, TiC powder, ZrC powder, VC powder, TaC powder, NbC powder, Cr 3 C 2 Powder, TiN powder and Co powder are used as raw material powders. These raw material powders are blended into the compounding composition shown in Table 1, and then wax is added and ball milled in acetone for 24 hours. The compact is vacuum sintered in a vacuum of 5Pa and kept at a specified temperature in the range of 1370-1470°C for 1 hour. After sintering, the cutting edge is subjected to R: 0.07mm edge grinding machining, thereby manufacturing WC-based cemented carbide tool substrates A to E each having an insert shape specified in ISO·CNMG120412.

[0065] 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 are used as raw material powders. These raw material powders are mixed into the compounding composition shown in Table 2. After wet mixing with a ball mill for 24 hours and drying, the...

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Abstract

The present invention provides a surface coating cutting tool with a hard coating layer playing excellent fracture resistance and excellent defect resistance in high-speed heavy cutting. The hard coating layer comprises a lower layer and an upper layer formed through chemical vapor deposition, wherein (a) the lower layer is a Ti compound layer which comprises at least one layer or more than two layers from the groups of a Ti carbonitride layer, a nitride layer, a carbonitride layer, a oxycarbide layer and a oxycarbonitride layer, and has a total average layer thickness of 3-20 [mu]m; and (b) the upper layer is an alumimum oxide layer having an average layer thickness of 2-25 [mu]m, the alumimum oxide layer forming the upper layer has a columnar longitudinal growth alumimum oxide crystal structure in which particles alumimum oxide are dispersed and distributed.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool (hereinafter referred to as a coated tool). During high-speed intermittent cutting of various steels or cast irons that are accompanied by high heat generation and intermittent impact loads acting on the cutting edge, due to the hard The coating has excellent chipping resistance, so it exhibits excellent cutting performance after long-term use. Background technique [0002] In the past, it is generally known that the surface of a tool substrate (hereinafter referred to as a tool substrate) composed of tungsten carbide (hereinafter represented by WC)-based cemented carbide or titanium carbonitride (hereinafter represented by TiCN)-based cermet consists of the following A coated tool comprising a hard coating layer composed of a lower layer (a) and an upper layer (b), and it is known that the coated tool is used for cutting various steels, cast irons, and the like. [0003] (a) Lower layer: ...

Claims

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Application Information

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IPC IPC(8): B23B27/14C23C16/30
Inventor 龙冈翔岩崎直之长田晃
Owner MITSUBISHI MATERIALS CORP
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