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Cemented carbide insert

a technology of cemented carbide and cutting tool, which is applied in the field of coating cemented carbide cutting tool insert, can solve the problems of significant loss of plastic deformation resistance, and achieve the effect of significantly improving the toughness of the gradient sintered cutting inser

Inactive Publication Date: 2007-10-23
SANDVIK INTELLECTUAL PROPERTY AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]It has now surprisingly been found that by using a gamma phase consisting essentially of only TaC and TiC in addition to WC, by keeping the ratio between the elements Ta and Ti within specific limits, and having a highly W-alloyed binder phase, the toughness properties of the gradient sintered cutting inserts can be significantly improved without any loss of plastic deformation resistance.

Problems solved by technology

Improved toughness behaviour of a cutting insert can be obtained by increasing the WC grain size and / or by raising the overall binder phase content, but such changes will simultaneously result in significant loss of the plastic deformation resistance.

Method used

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  • Cemented carbide insert
  • Cemented carbide insert

Examples

Experimental program
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Effect test

example 1

[0025]A.) Cemented carbide turning inserts of the style CNMG 120408-PM and SNMG120412-PR with the composition 9.9 wt % Co, 6.0 wt % TaC, 2.5 wt % TiC, and 0.3 wt % TiN, with the balance WC having an average grain size of 2.0 μm were produced according to the invention. The nitrogen was added to the carbide powder as TiCN. Sintering was done at 1450° C. in a atmosphere of Ar at a total pressure of about 50 mbar.

[0026]Metallographic investigation showed that the inserts had a gamma phase free zone of 15 μm. FIG. 1 shows a plot of the Co enrichment near the surface measured by an image analysis technique. The Co is enriched to a peak level of 1.3 times the bulk content. Magnetic saturation values were recorded and used for calculating CW-values. An average CW-value of 0.81 was obtained.

[0027]After a pre-coating treatment like edge honing, cleaning etc. the inserts were coated in a CVD-process comprising a first thin layer (less than 1 μm) of TiN followed by 6 μm thick layer of TICN wit...

example 2

[0031]Inserts from A, B and C were tested with respect to toughness in a longitudinal turning operation with interrupted cuts.

[0032]Material; Carbon steel SS1312.

[0033]

Cutting data:Cutting speed130m / minDepth of cut1.5mm

[0034]Feed=Starting with 0.15 mm and gradually increased by 0.10 mm / min until breakage of the edge

[0035]8 edges of each variant were tested

[0036]Inserts style: CNMG120408-PM

[0037]

Results:Mean feed at breakageInserts A0.31 mm / revInserts B0.22 mm / revInserts C0.22 mm / rev

example 3

[0038]Inserts from A, B and C were tested with respect to resistance to plastic deformation in longitudinal turning of alloyed steel (AISI 4340).

[0039]Insert style: CNMG 120408-PM

[0040]

Cutting data:Cutting speed =100m / minFeed =0.7mm / rev.Depth of cut =2mmTime in cut =0.50min

[0041]The plastic deformation was measured as the edge depression at the nose of the inserts.

[0042]

Results:Edge depression, μmInsert A49Insert B63Insert C62

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Abstract

The present invention relates to a cutting tool insert and its methods of manufacture for machining of steel comprising a cemented carbide body and a coatings. The cemented carbide body includes WC, 5-12 wt-% Co and 3-11 wt-% of cubic carbides of metals Ta and Ti. The amount of Nb is below 0.1 wt-% and the ratio Ta / Ti is 1.0-4.0. The Co-binder phase is highly alloyed with W with a CW-ratio of 0.75-0.95 and, finally, the cemented carbide body has a binder phase enriched and essentially gamma phase free surface zone of a thickness of 5-50 μm.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS [0001]The present application is a reissue of U.S. Pat. No. 6,344,264 B1, which claims the benefit of priority to Swedish Application No. 9901243-7 filed Apr. 8, 1999.<?insert-end id="INS-S-00001" ?>BACKGROUND OF THE INVENTION[0002]The present invention relates to a coated cemented carbide cutting tool insert particularly useful for turning operations in steels or stainless steels, and is especially suited for operations with high demands regarding toughness properties of the insert.[0003]High performance cutting tools must nowadays possess high wear resistance, high toughness properties and good resistance to plastic deformation. Improved toughness behaviour of a cutting insert can be obtained by increasing the WC grain size and / or by raising the overall binder phase content, but such changes will simultaneously result in significant loss of the plastic deformation resistance.[0004]Methods to improve the toughness behaviour by introduc...

Claims

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Application Information

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IPC IPC(8): B32B9/00B23B27/14B22F3/10B22F3/24B23P15/28C22C1/05C22C29/08C23C16/36C23C16/40C23C30/00
CPCC22C29/08C23C30/005B22F2003/247B22F2005/001B22F2998/00Y10T428/265Y10T428/24802Y10T428/24975Y10T428/252B22F2207/03
Inventor LENANDER, ANDERSLINDHOLM, MIKAEL
Owner SANDVIK INTELLECTUAL PROPERTY AB