Aluminum oxide coated tool

a technology of aluminum oxide and cutting tools, applied in the direction of instruments, natural mineral layered products, other chemical processes, etc., can solve the problems of diffusion type crater wear on the rake face of the tool, crater wear on the rake face, etc., and achieve the effect of high resistance to crater wear and flank wear

Inactive Publication Date: 2010-11-30
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016]It is further an object of this invention to provide improvements in coated bodies with respect to the tendency of smearing/welding of workpiece mater...

Problems solved by technology

During, e.g., a turning and cutting operation, the coated tool is worn continuously on its rake face by the formed metal chip which causes crater wear.
The machined workpiece also slides along the clearance face of the tool causing flank wear.
This leads to a diffusion type crater wear on the rake face of the tool.
On the clearance face of the tool, the temperature is significantly lower mainly so that abrasive type wear occurs.
Al2O3-layers on the other hand, wear relatively fast on the clearance face and develop flank wear relatively quickly on that face.
Flank wear influences the machined surface and may therefore limit tool life.
Flaking accelerates tool wear, in particular the flank wear.
Flaking may be the result of inferior coating adhesion or it may be du...

Method used

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Examples

Experimental program
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Effect test

example 1

[0041]Cemented carbide cutting inserts CNMG 120408-QM with the composition 5.5% Co, 8.6% cubic carbides (TiC-TaC-NbC) and balance WC were coated with CVD-technique according to the following sequence: 0.7 μm TiC, 0.5 μm Ti(CO), 8.0 μm Ti(CN), 3.0 μm Al2O3 and 2.8 μm TiN.

[0042]The Al2O3-layer was deposited with a method that gives a fine-grained α-Al2O3 layer according to U.S. Ser. No. 08 / 159,217 (our reference: 024000-993). The TiN-layer was deposited at 400 mbar and the other layers according to prior art techniques.

[0043]The coated inserts were post treated with different methods according to below:

[0044]Variant 1A: No post treatment.

[0045]Variant 1B: Wet blasting with 150 mesh Al2O3-grits at 1.0 bar.

[0046]Variant 1C: Wet blasting with 150 mesh Al2O3-grits at 1.5 bar.

[0047]Variant 1D: Wet blasting with 150 mesh Al2O3-grits at 2.0 bar.

[0048]Variant 1E: Wet blasting with 325 mesh Al2O3-grits at 2.0 bar.

[0049]Variant 1F: Brushing with a cylindrical nylon brush containing SiC.

[0050]Va...

example 2

[0059]Cemented carbide cutting inserts CNMG 120408-QM with the composition 5.5% Co, 8.6% cubic carbides (TiC-TaC-NbC) and balance WC were coated with CVD-technique according to the following sequence: 0.6 μm TiC, 0.4 μm Ti(CO), 8.1 μm Ti(CN), 8.1 μm on Al2O3 and 0.9 μm TiN.

[0060]The Al2O3-layer was deposited with a method that gives a fine-grained α-Al2O3 layer according to U.S. Ser. No. 08 / 159,217 (our reference: 024000-993). The TiN-layer was deposited at 400 mbar and the other layers according to prior art techniques.

[0061]The coated inserts were post treated with different methods according to below:

[0062]Variant 2A: No post treatment.

[0063]Variant 2B: Wet blasting with 150 mesh Al2O3-grits resulting in a smoother surface. Here the top TiN-layer was removed along the edge-line as well as on the whole rake face exposing the black Al2O3-layer.

[0064]Variant 2C: Brushing with a cylindrical SiC-containing nylon brush. This treatment resulted in a smooth surface with only the top TiN-...

example 3

[0065]Cemented carbide cutting inserts CNMG 120408-QM with the composition 5.5% Co, 8.6% cubic carbides (TiC-TaC-NbC) and balance WC were coated with CVD-technique according to the following sequence: 1.0 μm TiC, 0.4 μm Ti(CO), 7.9 μm Ti(CN) and 5.5 μm Al2O3.

[0066]The Al2O3-layer was deposited with a method that gives a fine-grained α-Al2O3 layer according to U.S. Ser. No. 08 / 159,217 (our reference: 024000-993).

[0067]The inserts were treated by wet blasting with 150 mesh Al2O3-grits (Variant 3).

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Abstract

There is provided a tool at least partly coated with at least two refractory layers of which one of the said layers is a fine-grained α-Al2O3-layer which is the top layer along the cutting edge-line and the other a TiCxNyOz- or a ZrCxNy-layer being the top layer on the clearance face. The coated tool exhibits excellent flank and crater wear and high resistance to flaking, particularly when used for machining of low carbon steel and stainless steel. Used cutting edges can easily be identified by the naked eye.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001]This application is a reissue of U.S. Pat. No. 5,861,210, which claims the benefit of priority to Swedish Application No. 9402543-4 filed Jul. 20, 1994. <?insert-end id="INS-S-00001" ?>BACKGROUND OF THE INVENTION[0002]The presently claimed invention relates to an Al2O3-coated cutting tool suitable for machining of metals by turning, milling, drilling or by similar chipforming machining methods.[0003]Modern high productivity chipforming machining of metals requires reliable tools with excellent wear properties. This has so far been achieved by employing a cemented carbide tool body coated with a wear resistant coating. The cemented carbide tool body is generally in the shape of an indexable insert clamped in a tool holder.[0004]The most commonly used wear resistant layers are TiC, TiN, and Al2O3. Both single layer and multilayer coatings are employed. CVD, PVD or similar coating techniques are used for depositing the different laye...

Claims

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Application Information

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IPC IPC(8): B23B27/14C23C16/30B23P15/28B32B19/00C23C16/40C23C16/56C23C30/00
CPCC23C16/403C23C16/56C23C30/005Y10T407/27Y10T428/265Y10T428/24975B23C5/20
Inventor LENANDER, ANDERSLJUNGBERG, BJORN
Owner SANDVIK INTELLECTUAL PROPERTY AB
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