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Cutting tool made of surface-coated cemented carbide with hard coating layer exhibiting excellent wear resistance in high speed cutting operation of high hardnes steel

A technology of superhard alloys and cutting tools, which is applied in the direction of manufacturing tools, coating of superimposed layers, metal processing equipment, etc., can solve problems such as deficiencies, and achieve excellent high-temperature hardness, excellent heat resistance, and excellent wear resistance Effect

Active Publication Date: 2006-08-23
MITSUBISHI MATERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The high performance of cutting processing equipment in recent years is amazing. On the one hand, there is a growing demand for labor-saving and energy-saving cutting processing, as well as low-cost requirements. Following this, cutting processing has a tendency to increase in speed. However, in In the above-mentioned existing coated superhard tools, the current situation is that when it is used for cutting steel, cast iron, etc. under normal cutting conditions, there is no problem if the composition corresponding to the cutting conditions is selected, but for accompanying High-speed cutting processing conditions where high heat occurs, especially for cutting high-hardness steels with a Vickers hardness (C scale) of 50 or more, such as quenched materials such as alloy tool steels and bearing steels, etc. In particular, due to the lack of heat resistance of the hard coating, wear progresses extremely rapidly, so the service life is reached in a relatively short time

Method used

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  • Cutting tool made of surface-coated cemented carbide with hard coating layer exhibiting excellent wear resistance in high speed cutting operation of high hardnes steel
  • Cutting tool made of surface-coated cemented carbide with hard coating layer exhibiting excellent wear resistance in high speed cutting operation of high hardnes steel
  • Cutting tool made of surface-coated cemented carbide with hard coating layer exhibiting excellent wear resistance in high speed cutting operation of high hardnes steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] As raw material powders, WC powder, TiC powder, Zr powder, VC powder, TaC powder, NbC powder, Cr 3 C 2 Powder, TiN powder, TaN powder, and Co powder. These raw material powders were prepared into the compounding composition shown in Table 1, wet mixed with a ball mill for 72 hours, and after drying, they were extruded into a compact with a pressure of 100 MPa. The pressed powder is sintered in a vacuum of 6MPa at a temperature of 1400°C for 1 hour. After sintering, the cutting edge is honed with R: 0.03 to form a WC in the shape of a blade according to ISO standard CNMG120408. Superhard substrates A-1 to A-10 made of superhard alloy.

[0045] And, as the raw material powder, TiCN (TiC / TiN=50 / 50 by weight ratio) powder, Mo 2 C powder, ZrC powder, NbC powder, TaC powder, WC powder, Co powder, and Ni powder. These raw material powders were blended into the compounding composition shown in Table 2, and wet-mixed with a ball mill for 24 hours. The pressure is extruded int...

Embodiment 2

[0077] 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, and NbC powder with an average particle size of 1.2 μm were prepared. , Average particle size: 1.2μm ZrC powder, Average particle size: 2.3μm Cr 3 C 2 Powder, average particle size: 1.5 μm VC powder, average particle size: 1.0 μm (Ti, W)C [in terms of mass ratio, TiC / WC=50 / 50] powder, and average particle size: 1.8 μm Co Powder, these raw material powders were formulated into the compounding composition shown in Table 7, and paraffin wax was added and mixed in acetone with a ball mill for 24 hours. After drying under reduced pressure, they were extruded into various compacted powders with a pressure of 100 MPa. body. Next, these green compacts were heated to a specified temperature in the range of 1370-1470°C at a rate of 7°C / min in a vacuum atmosphere of 6 Pa, and ...

Embodiment 3

[0100] It is 8mm (for the formation of superhard matrix C-1~C-3), 13mm (for the formation of superhard matrix C-4~C-6), and 26mm (for the formation of superhard matrix C-6) made in the above-mentioned embodiment 2. -7, C-8 for the formation of three kinds of round rod sintered bodies, from these three kinds of round rod sintered bodies, using grinding processing, respectively, the diameter × length of the groove forming part is 4mm × 13mm (superhard matrix D-1~D-3), 8mm×22mm (superhard matrix D-4~D-6), and 16mm×45mm (superhard matrix D-7, D-8), all of which have spiral Cemented carbide substrates (drills) D-1 to D-8 made of WC-based cemented carbide with 2 blades at an angle of 30 degrees.

[0101] Then, implement honing on the cutting edges of these superhard substrates (drill bits) D-1~D-8, carry out ultrasonic cleaning in acetone, and put them into the arc ion plating device shown in FIG1~FIG2 in a dry state, and Under the same conditions as in Example 1 above, according t...

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Abstract

A cutting tool made of surface-coated cemented carbide having the hard coating layer formed on the surface of a cemented carbide substrate, wherein the hard coating layer has a top layer and a bottom layer, the top layer includes a structure having the thin layer A and the thin layer B being stacked alternately, with the thin layer A having the composition of [Ti 1-(A+B) Al A Si B ]N (A is in a range from 0.01 to 0.06 and B is in a range from 0.25 to 0.35 in an atomic ratio) and the thin layer B having the composition of [Ti 1-(C+D) Al C Si D ]N (C is in a range from 0.30 to 0.45 and D is in a range from 0.10 to 0.15), and the bottom layer comprises single phase structure having the composition of [Ti 1-(E+F) Al E Si F ] N (E is in a range from 0.50 to 0.60 and F is in a range from 0.01 to 0.09).

Description

technical field [0001] The present invention relates to a cutting tool made of surface-coated cemented carbide (hereinafter referred to as a coated superhard tool). Excellent heat resistance, can exhibit excellent wear resistance when used in high-speed cutting of high-hardness steel such as hardened steel such as alloy tool steel and bearing steel, etc., which is accompanied by high heat generation. [0002] The priority of this patent has been claimed in Japanese Patent Application No. 2005-035684 and filed on February 14, 2005, the contents and references of which are incorporated herein. Background technique [0003] In general, coated superhard tools include non-sharpening blades that can be freely attached to the tip of the tool during turning and planing of various steels and cast irons. Inserts; Drills and small drills for piercing and cutting of the workpiece; In addition, integral end mills for face cutting, groove processing, shoulder processing and the like of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/14B23B51/00B23C5/02B23P15/28C23C14/06
CPCC23C30/005C23C28/42C23C28/044Y10T428/24975Y10T428/265A44B11/266A44B6/00
Inventor 近藤晓裕田中裕介前田浩一
Owner MITSUBISHI MATERIALS CORP