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Tools coated with cemented carbides

A cemented carbide and surface coating technology, which is applied in forming knives, manufacturing tools, sputtering coating, etc., can solve the problems of easy generation of debris on the cutting edge, achieve good cutting performance, reduce costs, and meet the effects of versatility

Inactive Publication Date: 2008-10-15
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned prior art coated cemented carbide cutting tool has no problem when used for continuous cutting and interrupted cutting under normal conditions such as steel and cast iron, but under strong cutting conditions such as high depth of cut and high feed Next, when cutting with an end mill or drill whose cutting edge is interrupted cutting, and performing intermittent turning with a non-sharpened insert (hereinafter collectively referred to as "interrupted cutting"), due to the high Thermal shock and mechanical shock, the above-mentioned surface hard layer is easy to peel off from the surface of the cemented carbide substrate. In addition, because the base layer and the surface hard layer are very hard, under the condition of strong cutting accompanied by high thermal shock and mechanical shock During intermittent cutting, chipping tends to occur on the cutting edge, and as a result, the tool reaches the end of its service life in a relatively short period of time

Method used

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  • Tools coated with cemented carbides
  • Tools coated with cemented carbides
  • Tools coated with cemented carbides

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Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0027] Based on the above reasons, the present inventors conducted intensive research to further improve the adhesion of the wear-resistant coating constituting the above-mentioned conventional coated cemented carbide tool to the surface of the cemented carbide substrate, and as a result obtained the following insights.

[0028] (a) above-mentioned cemented carbide substrate is installed on the arc ion plating device of a kind of physical vapor deposition device such as shown in Figure 1, at first, do not use cathode electrode, carry out pretreatment to above-mentioned cemented carbide substrate surface according to the following conditions

[0029] Atmospheric temperature in the device (tungsten carbide substrate temperature): 300-500°C

[0030] Atmospheric gas: Ar

[0031] Atmospheric pressure: 1-10Pa

[0032] Arc discharge current: (arc power supply-OFF)

[0033] Bias applied to the cemented carbide substrate: -800~-1000V

[0034] Processing time: 2-10 minutes

[0035] ...

Embodiment 1-1

[0058] As raw material powder, WC powder, (Ti, W) C (mass ratio, the same below, TiC / WC = 30 / 70) powder, (Ti, W) CN (TiC / TiN / WC=24 / 20 / 56) powder, (Ta, Nb)C (TaC / NbC=90 / 10) powder, Cr 3 C 2 Powder and Co powder, these raw material powders are mixed according to the ratio shown in Table 1-1, wet mixed with a ball mill for 72 hours, dried and pressed into a compact with a pressure of 100MPa, and the compact is vacuumed at 6Pa and 1410°C for 1 hour for vacuum sintering, respectively to make cemented carbide substrates A1-1-A1-6 in the shape of non-grinding blades specified in ISO·CNMG120408.

[0059] Subsequently, these cemented carbide substrates A1-1~A1-6 were ultrasonically cleaned in acetone, and they were respectively packed into the conventional arc ion plating device shown in Figure 1 in a dry state, and each of the above-mentioned cemented carbide substrates A1 -1~A1-6 surface, first, carry out pretreatment according to the following conditions

[0060] Atmospheric tem...

Embodiment 1-2

[0114] As raw material powders, medium-coarse WC powder with an average particle size of 5.5 μm, fine-grained WC powder with an average particle size of 0.8 μm, TaC powder with an average particle size of 1.3 μm, NbC powder with an average particle size of 1.2 μm, and an average particle size of 1.2 μm ZrC powder, Cr with an average particle size of 2.3μm 3 C 2 powder, VC powder with an average particle size of 1.5 μm, (Ti, W)C powder with an average particle size of 1.0 μm, and Co powder with an average particle size of 1.8 μm. Mix these raw material powders according to the proportions shown in Table 1-6, add wax, ball mill and mix in acetone for 24 hours, dry under reduced pressure and press into various compacts with a pressure of 100 MPa, these compacts are placed in In a vacuum atmosphere of 6Pa, heat up to a specified temperature in the range of 1370-1470°C at a heating rate of 7°C / min, keep at this temperature for 1 hour, and then sinter under furnace cooling conditio...

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PUM

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Abstract

A cutting tool has a surface-coated carbide alloy and a wear-resistant coating layer which has excellent adhesion and chipping resistance. The cutting tool has a surface-coated carbide alloy comprising: a tungsten carbide-based carbide alloy substrate having an amorphous layer formed by an arc ion plating surface treatment to an average depth of 1 to 50 nm from the surface; and a wear-resistant coating layer deposited physically and / or chemically on the surface of the tungsten carbide-based carbide alloy substrate, the wear-resistant coating layer comprising: (a) a lower tough layer made of a titanium nitride layer and having an average thickness of 0.1 to 5 mum ; and a single-layered or multi-layered surface hard layer which is made of a composite nitride layer of Ti and Al and a composite carbonitride layer of Ti and Al, which respectively satisfy the composition formula: (Ti1-XAlX)N and the composition formula: (Ti1-XAlX)C1-YNY (wherein X represents 0.15 to 0.65 and Y represents 0.5 to 0.99 in terms of an atomic ratio), and has an average thickness of 0.5 to 15 mum.

Description

technical field [0001] The invention relates to a surface-coated cemented carbide tool (hereinafter referred to as coated cemented carbide tool), whose wear-resistant coating has good adhesion to the surface of a tungsten carbide-based cemented carbide substrate (hereinafter referred to as cemented carbide substrate) , and the chipping resistance is also very good, so the above-mentioned wear-resistant coating is suitable for intermittent cutting of various steels or cast iron under strong cutting conditions such as high depth of cut and high feed under high thermal shock and mechanical shock The layer will not peel off or chip (microscopic defects), and can maintain good wear resistance for a long time. Background technique [0002] Generally speaking, cutting tools can be divided into: non-grinding blades that can be freely loaded and unloaded at the end of the cutter head, used for turning and planing of various steel or cast iron and other cut materials; Drills and micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/28C23C16/02C23C16/30C23C14/02C23C30/00
CPCC23C14/024C23C30/005Y10T428/24975Y10T428/265Y10T407/27
Inventor 冈田恒辉田代安彦中村惠滋
Owner MITSUBISHI MATERIALS CORP