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Surface coating cutting tool with excellent chipping resistance

A cutting tool and surface coating technology, which is applied in the field of surface coating cutting tools, can solve the problems such as the decrease of the strength of the tool matrix, and achieve the effects of improved adhesion, increased contact area, and improved heat resistance.

Active Publication Date: 2015-06-03
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In a coated tool using cBN sintered body as the tool matrix, further high-speed cutting of difficult-to-cut materials such as hardened steel requires further improvement of the adhesion of cBN particles to the hard coating, but as known in the past, it is pointed out that Solved the problem that if the unevenness on the surface of cBN particles is increased, the strength of the tool base will decrease

Method used

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  • Surface coating cutting tool with excellent chipping resistance
  • Surface coating cutting tool with excellent chipping resistance
  • Surface coating cutting tool with excellent chipping resistance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0066] Forming process of tool base:

[0067] As the raw material powder, prepare cBN particles having an average particle diameter of 0.5 to 4.0 μm as the raw material powder for forming a hard phase, and prepare TiN powder, TiC powder, TiCN powder, and Al powder, AlN powder and Al 2 o 3 The powder is used as a raw material powder for forming a binder phase.

[0068] The compounding ratio shown in Table 1 was compounded so that the content rate of cBN particle|grains might become 40-70 volume% when the total amount of several kinds of raw material powders and cBN powder was 100 volume%.

[0069] Next, use a ball mill to wet mix the raw material powder for 72 hours. After drying, press molding with a molding pressure of 100 MPa to a size of diameter: 50 mm x thickness: 1.5 mm. Pre-sintering is maintained at a specified temperature in the range of 900-1300°C, and then placed in an ultra-high pressure sintering device, and sintered at a specified temperature in the range of p...

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Abstract

The invention provides a surface coating cutting tool with excellent chipping resistance. The tool is a cBN sintered body cutting tool which maintains long-term excellent cutting performance and will not break when cutting high-hardness steel that needs high load cutting conditions during a high-speed cutting process. A hard coating layer of the surface coating cutting tool is formed by an A layer formed on the surface of a tool base body and a B layer arranged thereon. The A layer contains Ti1-aA1aN, wherein 0.3<=a<=0.7. The B layer contains Ti1-b-cA1bSicN, wherein 0.3<=b<=0.7, and 0.01<=c<=0.1. On the back blade surface of the tool base body, spherical recesses are formed on surfaces of cubic boron nitride particles that contact the hard coating layer.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool with a hard coating layer having excellent wear resistance, and more specifically, to a tool that is less prone to chipping even when used in high-speed cutting of high-hardness steel such as hardened steel. A surface-coated cutting tool (hereinafter referred to as a coated tool) exhibits excellent cutting performance over a long period of time. Background technique [0002] Generally, coated tools include inserts that are detachably attached to the tip of a turning tool for turning and face milling of workpieces such as various steels and cast irons, drills or drills used for drilling and cutting workpieces, etc. Small drills, and integral end mills used in face cutting, grooving, step processing, etc. of workpieces, etc., are known to have inserts detachably mounted and perform cutting in the same way as integral end mills. blade end mills, etc. [0003] The present invention relates to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/14C04B35/583
CPCB23B27/14B23B51/00B23B2224/24B23B2226/125B23B2228/32B23C5/16B23C2226/125B23C2228/10B23C2228/49
Inventor 佐藤峻仙北屋和明高桥正训
Owner MITSUBISHI MATERIALS CORP
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