Cutting tools made of cubic boron nitride based sintered materials

A cubic crystal boron nitride, boron nitride-based technology, applied in the manufacture of tools, workpieces, drilling accessories, etc., can solve the problem of insufficient chipping resistance and chipping resistance, a decrease in the proportion of cBN particles, and a decrease in tool hardness etc. to achieve excellent cutting performance, uniform tool properties, and reduced tensile residual stress

Active Publication Date: 2016-01-06
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at this time, due to Al 2 o 3 The film is thick (0.1-1μm), so the Al in the binding phase of the cBN sintered body 2 o 3 increase, the content ratio of cBN particles, which is a hard component in the cBN sintered body, relatively decreases, so there is a problem that the hardness of the tool decreases
In addition, when the above-mentioned conventional cBN tool is used for interrupted cutting of high-hardness steel, there is also a problem that the tool life is short due to insufficient chipping resistance and chipping resistance.

Method used

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  • Cutting tools made of cubic boron nitride based sintered materials
  • Cutting tools made of cubic boron nitride based sintered materials
  • Cutting tools made of cubic boron nitride based sintered materials

Examples

Experimental program
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Effect test

Embodiment

[0116] Al 2 o 3 Fabrication of membrane-coated cBN particles:

[0117] (a) Using cBN particles with an average particle size of 0.5 to 8 μm as the substrate, the surface of the particles is coated with uniform and thin Al by the ALD (Atomic Layer Deposition) method 2 o 3 membrane.

[0118] More specifically, for example, cBN particles having an average particle diameter of 3 μm are charged in the furnace, and the temperature in the furnace is raised to about 350° C. Second, using Al(CH 3 ) 3 and H 2 O gas is used as the film-forming gas, and Ar gas is used as the purge gas to carry out (i) Ar+Al(CH 3 ) 3 Gas inflow process, (ii) Ar gas purge process, (iii) Ar+H 2 O gas inflow process, (iv) Ar gas purge process. The steps (i) to (iv) are regarded as one cycle, and this cycle is repeated according to the desired film thickness. By forming a film for 1 to 12 hours, the surface of cBN particles is uniformly coated with Al having a desired film thickness. 2 o 3 membran...

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Abstract

A cutting tool made of cubic boron nitride-based sintered material that exhibits excellent chipping resistance and fracturing resistance in the intermittent cutting work on high hardness steel is provided. In the cutting tool, the average size of the cubic boron nitride particles is 0.5 to 8 µm. A portion of the cubic boron nitride particles are coated with aluminum oxide films having an average thickness of 10 to 90 nm on surfaces thereof, and a rift is partially formed in the aluminum oxide film. The average rift formation ratio satisfies the formula 0.02‰¦h / H‰¦0.08, wherein h is a breadth of the rift of the aluminum oxide film and H is a girth of the particle of cubic boron nitride.

Description

technical field [0001] The present invention relates to a cutting tool made of a cubic boron nitride (hereinafter referred to as cBN)-based sintered material (hereinafter referred to as cBN tool) excellent in chipping resistance and chipping resistance. [0002] This application claims priority based on Japanese Patent Application No. 2011-198016 filed in Japan on September 12, 2011 and Japanese Patent Application No. 2012-199070 filed in Japan on September 11, 2012, and uses the contents thereof here. Background technique [0003] Conventionally, cBN tools using a cBN-based sintered material (hereinafter referred to as a cBN sintered body) as a tool material having a low affinity with the workpiece in cutting of iron-based workpieces such as steel and cast iron are known. For example, as shown in Patent Document 1, ceramics such as carbides, nitrides, and borides of groups IVB, VB, and VIB of the periodic table are known to contain 20 to 80% by volume of cBN as a hard phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23B27/14B23B27/20C04B41/87
CPCC04B35/5831C04B35/62813C04B35/62889C04B35/62897C04B35/6303C04B37/026C04B2235/3804C04B2235/3817C04B2235/3856C04B2235/386C04B2235/3869C04B2235/3886C04B2235/5436C04B2235/5445C04B2237/125C04B2237/126C04B2237/127C04B2237/361C04B2237/401B22F2005/001C22C26/00C22C2026/003Y10T407/27B23B27/148B23B2226/125C04B2235/3217C04B2235/402
Inventor 矢野雅大大桥忠一宫下庸介
Owner MITSUBISHI MATERIALS CORP
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