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Coated cutting tool

A coating cutting tool and coating technology, applied in the field of coating cutting tools, can solve problems such as insufficient oxidation resistance

Active Publication Date: 2016-02-03
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Despite the increased hardness, the oxidation resistance of this columnar Ti(C,N) layer may be insufficient, especially for cutting operations that generate a lot of heat in the coating

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0052] Embodiment 1 (the present invention)

[0053] A coated cutting tool according to one embodiment of the present invention was fabricated. First, a cemented carbide R365-1505ZNE-KM substrate was fabricated. The substrates were then coated with the deposition process as disclosed in Table 1.

[0054] Manufacture substrate by pressing powder and sintering compact, its composition is 7.61wt% Co, 1.15wt% Ta, 0.27wt% Nb and balance WC, Hc value is 14.5kA / m (according to DINIEC60404-7, using FoersterKoerzimatCS1.096 measurement), hardness HV3 is 1550GPa. Prior to deposition, the substrate edges were rounded to about 35 μm by wet blasting. A coating was deposited on the substrate by CVD consisting of first a Ti(C,N) layer with a total thickness of about 4.8 μm consisting of the layer sequence 0.3 μm TiN, 4.1 μm MTCVDTi(C,N) and 0.4 μm HTCVDTi(C, N) composition, followed by a Ti(C,N,O) bond layer of 0.8 μm and α-Al with a thickness of 3.7 μm 2 o 3 layer, and finally a 1.2...

Embodiment 2

[0059] Embodiment 2 (prior art)

[0060] A coated cutting tool representative of the state of the art was fabricated for use as a reference. In Table 2 the deposition conditions used to grow the coatings are described. exist figure 2 A cross-sectional view of as-deposited Ti(C,N) is shown in .

[0061] First, a cemented carbide R365-1505ZNE-KM substrate having the same composition as disclosed in Example 1 above was fabricated. Prior to coating deposition, the substrate edges were rounded to about 35 μm by wet blasting. A coating consisting of the layer sequence 0.3 μm TiN, 4.7 μm MTCVDTi(C,N), 0.4 μm HTCVDTi(C,N), 0.6 μm tie layer containing Ti(C,O), thickness α-Al of about 3.4 μm 2 o 3 layer, and 1.4μm TiN / TiC / TiN / TiC / TiN colored layer.

[0062] After deposition, the coated cutting tool referred to as Sample 2A was wet blasted to remove the colored layer on the rake face, and the coated cutting tool referred to as Sample 2B was edgeline brushed to remove the colore...

Embodiment 3

[0065] Embodiment 3 (the present invention)

[0066] As shown in Tables 1 and 2, according to Example 1 with the corresponding MTCVDTi(C,N) layer, but with the tie layer corresponding to Example 2, α-Al 2 o 3 layer and colored layer to manufacture coated cutting tools. The cross-sectional view of deposited Ti(C,N) is shown in image 3 middle.

[0067] As explained in detail below, MTCVDTi(C,N) layers (see Table 4) and α-Al 2 o 3 The texture coefficient TC(hkl) of the columnar grains of the layer (see Table 5). MTCVDTi(C,N) has a sum of TC(311) and TC(422) of 3.84. α-Al 2 o 3 X-ray diffraction measurements of the layer showed a sum of TC(0012) and TC(104) of 2.17.

[0068] After deposition, the coated cutting tool referred to as Sample 3A was wet blasted to remove the colored layer on the rake face, and the coated cutting tool referred to as Sample 3B was edgeline brushed to remove the colored layer on the rake face. coating becomes uniform.

[0069] Table 1

[00...

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Abstract

The present invention provides a coated cutting tool comprising a substrate and a surface coating, wherein said coating comprises a Ti(C,N) layer comprising at least one columnar fine grained MTCVD Ti(C,N) layer with an average grain width of 0.05-0.5 MuEtaEta and an atomic ratio of carbon to the sum of carbon and nitrogen (C / (C+N)) contained in said MTCVD Ti(C,N) layer is in average 0.50-0.65.

Description

technical field [0001] The present invention relates to a coated cutting tool for chipforming machining of metals comprising a substrate having a surface coated by chemical vapor deposition (CVD). In particular, the invention relates to coated cutting tools having a CVD coating comprising at least one fine-grained titanium carbonitride. Background technique [0002] Cutting tools used for metal cutting to form machining, such as fillet tools, that is, end mills, drills, etc., and inserts made of durable materials such as cemented carbide, cermets, cubic boron nitride or high-speed steel, usually have Wear-resistant coating to extend the life of cutting tools. Because CVD has several advantages, this technique is often used to apply wear resistant coatings. It enables high throughput for cutting tool production, conformal coatings on complex geometries, and can be readily used to deposit insulating coatings such as aluminum oxide. [0003] In particular, cemented carbide c...

Claims

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Application Information

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IPC IPC(8): C23C16/36C23C30/00
CPCC23C16/36C23C30/005B24D3/34
Inventor 卡尔·比约恩曼德
Owner SANDVIK INTELLECTUAL PROPERTY AB
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