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Cemented carbide insert and method of making the same

A cemented carbide blade and cemented carbide technology, applied in metal processing equipment, etc., can solve problems such as increased wear resistance and loss

Inactive Publication Date: 2005-07-13
SANDVIK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This means that the increase in wear resistance obtained due to the smaller WC grain size will be lost to some extent due to the increased Co content

Method used

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  • Cemented carbide insert and method of making the same
  • Cemented carbide insert and method of making the same
  • Cemented carbide insert and method of making the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A cemented carbide compact of type B-SNGN120408 was prepared according to the following steps: a compact was pressed from a powder having a composition of 90 wt% WC and 10 wt% Co. The grains of the WC raw material were refined to an average grain size of 0.25 μm (FSSS). with Cr 3 C 2 Thin layer (0.02gCr 3 C 2 / cm 2 ) covering the rake face. Afterwards, these compacts were sintered at 1370° C. for 30 minutes, after which the outer 1 mm deep part was removed by grinding. The cross-section of the sinter-ground blank was observed. figure 1 A graph showing the relationship between hardness and cobalt content versus distance from the cutting edge. Cobalt content is lowest near the edge and increases with distance, while hardness is highest near the edge and decreases with distance. figure 2 A graph showing the relationship between chromium content and distance from the cutting edge. Chromium levels are highest near the blade edge and decrease with distance. Cobalt ...

Embodiment 2

[0036] A cemented carbide compact of type B-SNGN120408 was prepared according to the following procedure: a compact was pressed from a powder having a composition of 94 wt% WC and 6 wt% Co. The grains of the WC raw material were refined to an average grain size of 0.25 μm (FSSS). With 0.007gCr 3 C 2 / cm 2 Cover the rake face.

[0037] At 1350°C will have Cr 3 C 2 The compact of the layers was sintered for 30 minutes and a post-HIP treatment was performed at 1300° C. and 6 MPa for 30 minutes. Observe the cross-section of the sintered billet. No Cr was observed on this surface 3 C 2 . The table below shows the HV3, cobalt content, chromium content and WC grain size for this example.

[0038] HV3 1720 at 100μm from the cutting edge

[0039] HV3 1520 at 3mm from the blade

[0040] Cobalt content at 100 μm from the blade edge, wt% 4.0

[0041] Cobalt content at 3mm from the cutting edge, wt% 6.5

[0042] Chromium content at 100 μm away from the blade, wt% 0.7

[0043...

Embodiment 3

[0047] A cemented carbide compact of type B-SNGN120408 was prepared according to the following steps: a compact was pressed from a powder having a composition of 90 wt% WC and 10 wt% Co. with Cr 3 C 2 Thin layer (0.01gCr 3 C 2 / cm 2 ) covering the rake face. Afterwards, these compacts were sintered at 1370° C. for 30 minutes. The cross-section of the sintered billet was observed. No Cr was observed on this surface 3 C 2 . The table below shows the HV3, cobalt content, chromium content and WC grain size for this example.

[0048] HV3 1450 at 100μm from the blade

[0049] HV3 1280 at 3mm from the blade

[0050] Cobalt content at 100μm from the blade edge, wt% 7.5

[0051] Cobalt content at 3mm from the cutting edge, wt% 11

[0052] Chromium content at 100 μm away from the blade, wt% 0.4

[0053] Chromium content at 3mm from the blade, wt% <0.05

[0054] WC grain size at 100 μm away from the blade, μm 1.1

[0055] WC grain size at 3mm from the blade, μm 1.4

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Abstract

The present invention relates to an insert of a cemented carbide cutting tool comprising a hard component in a binder phase of Co and / or Ni and comprising at least one surface portion and an inner portion, wherein the grain size of the surface portion smaller than the grain size in the inner part. The surface fraction with fine grain size has a lower binder phase content than the inner fraction.

Description

technical field [0001] The invention relates to a hard alloy cutting tool blade made by sintering technology. More specifically, the present invention relates to such an insert of a cemented carbide cutting tool produced by sintering techniques in which two distinct microstructural regions with complementary properties are formed. Background technique [0002] In cemented carbide, both the grain size and the content of the binder phase (eg, cobalt) have an impact on the properties of the composite. For example, the smaller or finer the grain size of tungsten carbide, the more wear resistant the material. Increased cobalt content generally results in increased toughness. [0003] Cemented carbides with fine grain sizes are produced by incorporating grain refiners in the initial powder mixture. This cemented carbide has a fine grain size throughout its microstructure. Cemented carbides with coarse grain size are produced by sintering without incorporating any grain refiner...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22FB22F7/06C22C29/08
CPCC22C1/051C22C29/08
Inventor 玛丽安娜·科林苏珊·诺格伦
Owner SANDVIK LTD
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