Surface coated cutting tool

A cutting tool, surface area technology, applied in manufacturing tools, tools for lathes, metal material coating processes, etc., can solve the problems of reduced film strength, increased surface roughness, and reduced peel resistance, achieving excellent Abrasion resistance, the effect of reducing the possibility

Inactive Publication Date: 2010-09-22
SUMITOMO ELECTRIC IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the CVD tool has a problem that since the base material of the CVD tool has a different coefficient of thermal expansion from a coating such as an alumina film or a TiCN film, if the film thickness is increased to about 15 μm, a large residual material will be generated in the coating. Tensile stress, the strength of the film will decrease, and the surface roughness of the film will also increase, so that the anti-peeling performance of the film will decrease
However, in this scheme, the type of coating is limited to coatings with a specific composition and specific crystallographic orientation, so its application range is limited; moreover, even if the coating can be formed without film damage, it cannot be fully To prevent compression failure in the coating under impact during cutting operations, resulting in the need to extend tool life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 6 and comparative example 1 to 4

[0081] In the following Examples 1-6, the formed coatings were all layers having a single composition, but a coating whose composition was different from those in these Examples was used, or two or more coatings having different compositions were used. Coatings formed from layers, or using at least a portion of a coating having a super multilayer structure, may also provide similar benefits.

[0082] Production of surface-coated cutting tools

[0083] First, indexable inserts for cutting (base material No. 1 and base material No. 2) formed of materials shown in Table I below and having a tool shape shown in Table I below were prepared as the surface-coated inserts. The substrates of the cutting tools (in preparation for the various characterization methods described below) were then mounted on cathodic arc ion plating equipment. The substrates were formed of cemented carbide and contained WC grains with an average grain size (those grains on the surface of the substrate (at t...

Embodiment 7 to 12 and comparative example 5 to 10

[0113] Two kinds of cemented carbide substrates were prepared as the substrates of the coated cutting tools (one for each property evaluation method described later), and the compositions of the cemented carbide substrates were both WC-2TaC-0.7Cr 3 C 2 -7Co (wherein the numerical value represents the weight percentage, and the remainder is WC), but contains WC grains of different grain sizes (the average grain size of the WC grains in Examples 7, 9 and 11 is 1.2 μm, and in Examples 8 and 10 and 12, the average grain size of the WC grains is 3.5 μm). The substrate was fabricated into indexable cutting inserts having the tool shapes shown in Table I. These substrates were mounted on cathodic arc ion plating equipment.

[0114] Subsequently, the internal pressure of the chamber of the apparatus was lowered using a vacuum pump, and at the same time, the temperature of the substrate was raised to 450° C. using a heater installed in the apparatus. The chamber was evacuated until ...

Embodiment 13 to 15 and comparative example 11

[0129] Preparation of surface-coated cutting tools

[0130] First, indexable inserts for cutting (base material No. 1 and base material No. 2) formed of the materials shown in the above Table I and having the shape of the tool shown in the above Table I were prepared as the surface-coated inserts. The substrates of the cutting tools (in preparation for the various characterization methods described below) were then mounted on cathodic arc ion plating equipment. The substrates were formed of cemented carbide and contained WC grains with an average grain size (those grains on the surface of the substrate (at the interface with the coating)) as shown in Table I.

[0131] Subsequently, the internal pressure of the chamber of the apparatus was lowered using a vacuum pump, and the temperature of the substrate was raised to 450° C. using a heater installed in the apparatus. The chamber was evacuated until its internal pressure reached 1.0 x 10 -4 Pa.

[0132] Next, argon gas was i...

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Abstract

Disclosed is a surface coated cutting tool comprising a base and a coating layer formed on the base, wherein the coating layer is a physical vapor deposition layer having a thickness of 10 [mu]m or more, a surface region having a thickness of 1 [mu]m from the surface of the coating layer has a first region where an integrated residual stress becomes a compressive stress and a second region where an integrated residual stress becomes a tensile stress. The surface coated cutting tool is characterized in that the integrated residual stress in the surface region falls within a range from -1.5 GPa to 1.5 GPa in any region included in the surface region.

Description

technical field [0001] The present invention relates to a surface-coated cutting tool comprising a substrate and a coating formed on the substrate. Background technique [0002] Various cutting tools are widely used for cutting metal materials. For example, available are: chemical vapor deposition (CVD) tools, physical vapor deposition (PVD) tools, cermet tools, cemented carbide tools, and ceramic tools, which are applied depending on the purpose. Among them, the CVD tool is a tool on which a coating (ceramic coating) is formed on a base material by a CVD method, and the PVD tool is a tool on which a coating (ceramic coating) is formed on a base material by a PVD method, while cermets Tools, carbide tools and ceramic tools can be classified as tools without the above-mentioned coating. [0003] In recent years, CVD tools and PVD tools have been increasingly used as cutting speeds have increased. The CVD tool is mainly used as a turning tool for steel materials because an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/14B23B51/00B23C5/16C23C14/06
CPCC23C28/048C23C14/325C23C14/0036C23C28/42C23C28/044C23C14/0641C23C30/005Y10T407/27Y10T409/30308Y10T428/24942Y10T428/24967Y10T428/24975
Inventor 森口秀树瀬户山诚宫永美纪沖田淳也小池沙知子田林大二
Owner SUMITOMO ELECTRIC IND LTD
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