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Surface-coated cutting tool with knife broken resistance and excellent performance of hard-coated layer

A cutting tool and surface coating technology, which is applied in the field of surface coating cutting tools, can solve problems such as chipping, chipping, and insufficient impact resistance

Active Publication Date: 2012-07-18
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In recent years, the performance of cutting devices has been significantly improved. On the other hand, there is a strong demand for labor-saving, energy-saving, and cost-effective cutting processes. With this, there is a trend of increasing the speed of cutting processes. However, the current situation is as follows: In the above In the conventional coated tools, it is not a problem to use it for continuous cutting under normal conditions such as steel or cast iron, but it is especially used for high heat generation and intermittent and impact loads acting on the cutting edge. Under high-speed interrupted cutting conditions, due to the hard coating layer, especially the Al on the upper layer 2 o 3 There is residual stress in the layer and the impact resistance is insufficient, and once a crack occurs due to impact, etc., the progress of the crack will be accelerated due to the internal stress in the layer, so chipping and chipping are prone to occur, and the result is shorter reach service life within

Method used

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  • Surface-coated cutting tool with knife broken resistance and excellent performance of hard-coated layer
  • Surface-coated cutting tool with knife broken resistance and excellent performance of hard-coated layer
  • Surface-coated cutting tool with knife broken resistance and excellent performance of hard-coated layer

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Embodiment

[0092] Prepare the powders shown in Table 1 with an average particle size of 1 to 3 μm as raw material powders, mix these raw material powders into the compounding composition shown in Table 1, add wax, ball mill and mix in acetone for 24 hours, and dry under reduced pressure , Pressing at 98MPa to form a green compact of a specified shape, the green compact is vacuum sintered in a vacuum of 5 Pa and kept at a specified temperature in the range of 1370-1470°C for 1 hour. After sintering, the cutting edge R: 0.07mm edge grinding processing was performed on the part, thereby manufacturing WC-based cemented carbide tool substrates A to E each having an indexable insert shape specified in ISO·CNMG160412.

[0093] In addition, the powders shown in Table 2 each having an average particle diameter of 0.5 to 2 μm were prepared as raw material powders, and these raw material powders were blended into the compounding compositions shown in Table 2, wet-mixed with a ball mill for 24 hours ...

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Abstract

The invention provides a surface-coated cutting tool with knife broken resistance and excellent performance of hard-coated layer in high-speed cutting processing. In the surface-coated cutting tool, a Ti compound layer at least including a TiCN layer is formed as a lower layer on the surface of the tool body, an Al2O3 layer including Zr as the upper layer, wherein kappa-Al2O3 crystallites containing Zr and alpha-Al2O3 crystallites containing Zr are included, In addition, kappa-Al2O3 crystallites containing Zr as an upper layer is fomed over the TiCN[110] crystallites, and alpha-Al2O3 crystallites containing Zr as an upper layer is formed over TiCN[112]. More than 30% of the alpha-Al2O3 crystallites comprises Al2O3[0001] crystallites, and the crack density of alpha-Al2O3 crystallites containing Zr is high than that of kappa-Al2O3 crystallites containing Zr.

Description

technical field [0001] The present invention relates to a kind of cutting process of workpieces such as various steels or cast irons especially under the condition of high-speed intermittent cutting accompanied by high heat generation and impact and intermittent load acting on the cutting edge. A surface-coated cutting tool (hereinafter referred to as a coated tool) exhibits excellent chipping resistance for long-term use. Background technique [0002] In the past, it is generally known to vapor-deposit on the surface of a 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. Coated tools including the hard coatings of (a) and (b) below: [0003] (a) Ti compound layer as the lower layer, including Ti carbide (hereinafter represented by TiC) layer, nitride (hereinafter also represented by TiN) layer, carbonitride (here...

Claims

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Application Information

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IPC IPC(8): B23B27/14B23P15/28C23C16/30
Inventor 龙冈翔富田兴平中村惠滋长田晃
Owner MITSUBISHI MATERIALS CORP
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