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Coated surface cutting tool

A technology for cutting tools and surface coating, which is applied in the field of surface coating cutting tools, and can solve problems such as hard coating peeling off

Active Publication Date: 2018-01-26
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when conventional coated tools are used under high-speed, high-depth-of-cut / high-feed heavy cutting conditions, peeling of the hard coating tends to occur, and therefore tool life is reached in a relatively short time

Method used

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  • Coated surface cutting tool
  • Coated surface cutting tool
  • Coated surface cutting tool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0084] WC powder, TiC powder, ZrC powder, TaC powder, NbC powder, Cr 3 C 2 powder, TiN powder and Co powder, these raw material powders are compounded according to the compounding composition shown in Table 1, and paraffin wax is added, mixed by ball milling in acetone for 24 hours, dried under reduced pressure, and then stamped under a pressure of 98MPa to form A green compact of a predetermined shape was vacuum sintered under the conditions of maintaining the green compact at a predetermined temperature in the range of 1370 to 1470 °C for 1 hour in a vacuum of 5 Pa. After sintering, the blade shapes of the ISO standard CNMG120408 were manufactured. Tool substrates A to E made of WC-based cemented carbide.

[0085] And, as the raw material powder, TiCN (TiC / TiN=50 / 50 by mass ratio) powder, ZrC powder, TaC powder, NbC powder, Mo 2 C powder, WC powder, Co powder and Ni powder, these raw material powders are compounded according to the composition shown in Table 2, wet mixed w...

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Abstract

The purpose of the present invention is to provide a coated surface cutting tool that exhibits excellent peeling resistance and chipping resistance under deep cutting conditions of high speed, high cutting depth and high feed rate in which high loads act on the cutting edge. Provided is a coated surface cutting tool in which a hard coating layer obtained from an under layer and an upper layer is formed on the surface of a tool substrate configured from a tungsten carbide-based hard alloy or a titanium carbonitride-based cermet, wherein: said under layer is obtained from a Ti compound layer comprising at least a TiCN layer; and the upper layer is obtained from an Al2O3 layer with an alpha-type crystal structure and when the coincidence boundary distribution graph of the Al2O3 crystal grainsof the upper layer is measured, sulfur is segregated at grain boundaries of at least delta31, the grain boundary length thereof accounts for 20-50% of the total grain boundary length for constituentatom-sharing lattice point forms of at least delta3, and the absolute value of the residual stress of the upper layer on the flank and the cutting face comprising at least the cutting edge ridge is 100 MPa or less.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool (hereinafter, referred to as a coated tool) for cutting various steels under high-feed / high-depth-of-cut heavy cutting conditions with high speed and high load on the cutting edge. In the case of cutting processing such as cast iron or cast iron, the hard coating layer exhibits excellent peeling resistance and chipping resistance, and exhibits excellent cutting performance in long-term use. Background technique [0002] In the past, it is generally known that there are substrates made of tungsten carbide (hereinafter, represented by WC)-based cemented carbide or titanium carbonitride (hereinafter, represented by TiCN)-based cermets (hereinafter, these are collectively referred to as tool substrates). A coated tool with a hard coating layer consisting of the following (a) and (b) formed by vapor deposition on the surface: [0003] (a) The lower layer is composed of Ti carbide (hereinafter, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/14C23C16/30C23C16/36C23C16/40
CPCC23C16/30C23C16/32C23C16/34C23C16/36C23C16/403C23C28/044C23C28/048C23C30/005B23B2224/32B23B2228/105B23C2224/32B23C2228/10C23C16/405B23B27/148B23B2222/88
Inventor 奥出正树山口健志
Owner MITSUBISHI MATERIALS CORP
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