CBN sintered body cutting tool with excellent toughness

A cutting tool and sintered body technology, which is applied in the field of cBN sintered body cutting tools with excellent toughness, can solve the problems of tool tip chipping or defect, insufficient toughness, and inability to use cutting performance for a long time, so as to maintain cutting performance, The effect of excellent cutting performance

Active Publication Date: 2013-09-18
MITSUBISHI MATERIALS CORP
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  • Abstract
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  • Claims
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Problems solved by technology

[0007] However, when cutting high-hardness steel with conventional cutting tools, there is no particular obstacle when cutting under normal conditions, but when interrupted cutting requires higher load cutting conditions, the toughness is insufficient. However, chipping or chipping of the tool tip is prone to occur, and there is a problem that sufficient cutting performance cannot be maintained over a long period of use.

Method used

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  • CBN sintered body cutting tool with excellent toughness
  • CBN sintered body cutting tool with excellent toughness
  • CBN sintered body cutting tool with excellent toughness

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Embodiment

[0046] In Table 2, inserts 1 to 9 of the present invention produced as examples of the present invention and comparative inserts 10 to 18 produced for comparison are shown.

[0047] First, a method for producing a cBN sintered body using inserts 1 to 9 of the present invention will be described.

[0048] 1) Formation of granular TiN on raw cBN powder

[0049] 1-1) A TiN film was formed on cBN powder with an average particle size of 3 μm by atomic layer deposition (ALD: Atomic Layer Deposition).

[0050] When coating cBN powder with two kinds of raw material gases A and B by the ADL method, the cBN particles are charged into the fluidized bed furnace, the temperature is raised to a predetermined temperature, and the raw material gas A is flowed into the process, the Ar gas purge process, the raw material The gas B inflow process and the Ar gas purge process constitute one cycle, and this cycle is repeated until the target layer thickness is reached to obtain a TiN film with a ...

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Abstract

An object of the present invention is to provide a cBN sintered body cutting tool with excellent toughness. While being used for interrupted cutting of high-hardness steel even if in the situation requiring high-load cutting conditions, the cutting tool provided by the invention is prevented from proneness to the cracks and defects of the blade and has excellent cutting performance which can be maintained for a long term. The cBN sintered body cutting tool comprises a sintered body including cubic boron nitride and a binder phase as a tool substrate, wherein a binder phase structure is existed in the area within 100nm from the grain boundary of the cubic boron nitride towards the binder phase, and is composed of one or more than two selected from the group of nitrides, carbides, carbon nitrides and borides of Ti, nitrides, borides and oxides of Al, and solid solution of more than two of them, and inevitable impurities, and has fine structures with an average volume diameter MV of 10-80 nm. Thus, the object of the present invention is achieved.

Description

technical field [0001] The invention relates to a cBN sintered body cutting tool which takes cubic boron nitride (hereinafter referred to as cBN) as the main component and sinters it under ultra-high pressure and high temperature. A cBN sintered cutting tool that can suppress the occurrence of chipping or chipping during interrupted cutting of high-hardness steel made of hardened materials such as steel, and can maintain excellent cutting performance over a long period of use. Background technique [0002] Conventionally, cBN sintered body cutting tools using a cBN sintered body as a tool base are known as high-hardness steel cutting tools, and various proposals have been made for the purpose of improving tool life in interrupted cutting. [0003] For example, as shown in Patent Document 1, cBN is contained at 25 to 47% by volume, and carbonitrides and borides of Ti are contained at a total of 40 to 70% by volume. The volume ratio of carbon and nitrogen in the carbonitrides ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/5831
Inventor 矢野雅大大桥忠一宫下庸介
Owner MITSUBISHI MATERIALS CORP
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