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Coated grooving or parting insert

a technology of cemented carbide body and insert, which is applied in the direction of chemical vapor deposition coating, turning machine accessories, natural mineral layered products, etc., can solve the problems of affecting the cutting performance of the grooving, the inability to effectively meet the requirements of both coating can flake, and the inability to effectively meet the requirements of carbide chips, etc., to achieve excellent cutting performance in the grooving

Inactive Publication Date: 2008-01-01
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a cutting tool insert that has excellent performance in grooving and severing of steel or stainless steel. The insert is made by coating a cemented carbide body with a combination of layers. The first layer is made of titanium carbide and has a thickness of 0.1-1.5 μm and equiaxed grains with size<0.5 μm. The second layer is made of titanium carbide and has a thickness of 0.4-3.9 μm with coluanar grains of 0.1-5.0 μm. The third layer is a smooth fine-grained κ—Al2O3 layer with a thickness of 0.5-5.5 μm. The total thickness of all layers is 2.0-6.0 μm. The invention also includes a method for making the cutting tool insert by coating the body with the same layers. The technical effects of the invention are improved cutting performance and durability of the cutting tool insert.

Problems solved by technology

As a result, the coating can flake and small cemented carbide chips can be torn out of the cutting tool or cutting tool insert substrate body.
Finding a cutting tool material that effectively fulfils both these requirements is a challenge.
So far it has been very difficult to improve all tool properties simultaneously.

Method used

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  • Coated grooving or parting insert
  • Coated grooving or parting insert

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0039]A. A cemented carbide cutting tool insert in style N151.2-300-5E with the composition 10.5 wt-% Co, 1.16 wt-% Ta, 0.28 wt-% Nb and balance WC, with a binder phase highly alloyed with W corresponding to a CW-ratio of 0.87, was coated with an innermost 0.5 μm equiaxed TiC0.05N0.95-layer with a high nitrogen content, corresponding to an estimated C / N ratio of 0.05, followed by a 2.2 μm thick layer of columnar TiCo0.54N0.46 deposited using MT-CVD technique. In subsequent steps during the same coating process a 1.5 μm layer of Al2O3 consisting of pure ic-phase was formed according to procedure disclosed in EP-A-523 021. A thin, 0.5 μm, TiN layer was deposited, during the same cycle, on top of the Al2O3-layer. Hence, the total thickness of all layers is 4.7 μm. The coated insert was brushed by a SiC containing nylon straw brush after coating, removing the outer TiN layer on the edge.

[0040]B. A cemented carbide cutting tool insert in style N151.2-300-SE with the composition of 8.0 wt...

example 2

[0045]Inserts A, B, C and D from above were tested in a serving test of stainless steel (SS2343) in the form of 12 mm bar stainless steel.

[0046]The rotating speed was 1800 rpm, feed varying 0.15-0.02 mm / rev (low feed rate close to centre of bar).

[0047]The wear mechanism was flaking combined with nose cracking.

[0048]

InsertNumber of componentsA (acc. to invent.)380B (outside invention)180C (outside invention)200D (external grade)200

example 3

[0049]Inserts A (insert style N151.2-400-4E) and D were tested at an end users machine shop in severing of stainless steel tube (SS2343, OD 27 mm, ID 25 mm) with feed 0.05 mm / rev and speed 150 m / min.

[0050]Insert D failed due to major chipping of the cutting edge while a very small chipping was seen on insert A.

[0051]

InsertNumber of componentsA (acc. to invention)324D (external grade)108

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Abstract

The present invention relates to a coated cutting tool insert useful for grooving or severing steel components such as steel or stainless steel tubes and bars. The insert is characterized by WC—Co-based cemented carbide substrate having a highly W-alloyed Co-binder phase and a relatively thin coating including an inner layer of TiCxNyOz with columnar grains followed by a layer of fine grained κ—Al2O3 and a top layer of TiN.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]The present application is a reissue of U.S. Pat. No. 6,261,673 B1, which claims the benefit of priority to Swedish Application No. 9802488-8 filed Jul. 9, 1998.FIELD OF THE INVENTION[0002]The present invention relates to a coated cemented carbide body. The present invention further relates to a coated cutting tool insert useful for grooving or severing steel components such as steel or stainless steel tubes and bars.BACKGROUND OF THE INVENTION[0003]When steel or stainless steel tubes or bars are severed using an appropriate coated cutting tool or cutting tool insert, the cutting edge is frictionally heated to a high temperature with the consequence that the material being cut becomes welded onto the cutting edge of the cutting tool insert. As a result, the coating can flake and small cemented carbide chips can be torn out of the cutting tool or cutting tool insert substrate body.[0004]On the other hand, for grooving of the same material...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B32B9/00B23B27/14B23B27/04B23P15/28C22C29/08C23C16/30C23C16/36C23C16/40C23C30/00
CPCC23C16/30C23C16/36C23C16/403C23C30/005Y10T428/24975Y10T428/252Y10T428/24802Y10T428/25C23C4/10
Inventor REINECK, INGRIDSELINDER, TORBJORNPIIRHONEN, ANDERSKULLANDER, GREGOR
Owner SANDVIK INTELLECTUAL PROPERTY AB