WO2021193159A1 - Ｗｃ基超硬合金製切削工具 - Google Patents

Ｗｃ基超硬合金製切削工具 Download PDF

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Publication number
WO2021193159A1
WO2021193159A1 PCT/JP2021/010161 JP2021010161W WO2021193159A1 WO 2021193159 A1 WO2021193159 A1 WO 2021193159A1 JP 2021010161 W JP2021010161 W JP 2021010161W WO 2021193159 A1 WO2021193159 A1 WO 2021193159A1
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WIPO (PCT)
Prior art keywords
phase
cemented carbide
cutting tool
based cemented
particles
Prior art date
Application number
PCT/JP2021/010161
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English (en)
French (fr)
Japanese (ja)
Inventor
佳祐 河原
龍 市川
五十嵐　誠
岡田　一樹
Original Assignee
三菱マテリアル株式会社
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Application filed by 三菱マテリアル株式会社 filed Critical 三菱マテリアル株式会社
Priority to JP2022509932A priority Critical patent/JPWO2021193159A1/ja
Priority to EP21776329.1A priority patent/EP4129540A4/de
Publication of WO2021193159A1 publication Critical patent/WO2021193159A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C22C1/051—Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor

Definitions

  • the average particle size of the ⁇ phase is 0.2 to 4.0 ⁇ m.
  • a coating layer is formed on the cutting edge.
  • WC-WC interface length the ratio of the contact length at the interface where WC particles having a high Young's modulus contact each other
  • WC-WC interface causes the WC particles to undergo plastic deformation. Acts as a skeleton that interferes with Furthermore, by including an appropriate amount and an appropriate particle size of ⁇ phase in the WC-based cemented carbide cutting tool, the grain boundary slip at the WC-WC interface is reduced. Improve the plastic deformation resistance of WC-based cemented carbide cutting tools.
  • the WC-based cemented carbide cutting tool according to the embodiment of the present invention will be described in detail.
  • the range includes an upper limit value (M) and a lower limit value (L).
  • the unit of the upper limit value (M) and the lower limit value (L) is the same.
  • the numerical values include tolerances.
  • Co Co is contained as a component of the main binding phase. If the Co content is less than 8.0% by mass, the WC-based cemented carbide cutting tool cannot have sufficient toughness, while if the Co content exceeds 14.0% by mass, it rapidly softens and cuts. The desired hardness required for a tool cannot be obtained, and deformation and wear progress become remarkable. Therefore, the Co content in the WC-based cemented carbide cutting tool is preferably 8.0 to 14.0% by mass. The Co content is more preferably 8.5 to 12.0% by mass.
  • the bonded phase may contain W, C, and other unavoidable impurities. Further, Cr and at least one of Ta, Nb, Ti, and Zr, which are elements of the metal component constituting the ⁇ phase, may be contained. When these elements are present in Co, it is presumed that they are in a solid solution state in Co.
  • Cr 3 C 2 Cr 3 C 2 is preferably contained in an amount of 0.1 to 1.4% by mass.
  • Cr 3 C 2 is solid-solved as Cr in Co that mainly forms a bonding phase, and Co is solid-solved and strengthened to increase the strength of the WC-based cemented carbide cutting tool. This action is insufficient when the Cr 3 C 2 content is less than 0.1% by mass, while when the content exceeds 10% with respect to the Co content, Cr is precipitated as a composite carbide with W.
  • the upper limit of Co content of 14.0% by mass is taken into consideration, and 1.4% by mass, which is 10% of the upper limit, is the content of Cr 3 C 2. The upper limit of.
  • the metal elements of these components are dissolved in Co forming the main bonding phase, thereby improving the high temperature hardness of the bonding phase.
  • the metal elements of these components do not dissolve in the bonded phase and are present as a ⁇ phase (which may further contain W in addition to the metal elements of these components), which is a carbide phase, so that they are oxidation resistant. It has a function of enhancing properties and crater wear resistance, and adheres to the WC-WC interface to suppress grain boundary slip at the WC-WC interface.
  • the average particle size of the ⁇ phase is more preferably 0.2 to 4.0 ⁇ m, which makes the contact frequency with the WC particles appropriate.
  • the average particle size of the ⁇ phase is at least 300 by mirror processing any surface or cross section of a WC-based cemented carbide cutting tool, observing the processed surface with a scanning electron microscope (SEM), and performing image analysis. The area of each ⁇ phase is obtained, and the diameter of a circle equal to the area is calculated and averaged.
  • SEM scanning electron microscope
  • FIB device focused ion beam device
  • CP device cross section polisher device
  • the sintered body structure of the WC-based cemented carbide cutting tool has a WC-WC interface length ratio (R value), a WC area average particle size (D) ( ⁇ m), and a bonded phase area ratio (V), ⁇ . It is defined by the phase theoretical volume ratio.
  • WC-WC interface length ratio (R) Since the WC-WC interface length ratio (R) is high, WC particles with a high Young's modulus act as a skeleton that hinders plastic deformation, so that a WC-based cemented carbide cutting tool with excellent plastic deformation resistance can be obtained. be able to.
  • the bonded phase contains Co as a main component and the metal elements (Ta, Nb, Ti, Zr) of the W, C, Cr, and ⁇ phase components are solid-dissolved, and the ⁇ phase is Ta, Nb, Ti. , Zr, one or more of the carbide phases formed mainly of the metal element of the ⁇ phase component.
  • a method for measuring the WC-WC interface length L1 and the WC- (bonded phase + ⁇ phase) interface length L2 will be described with reference to FIG. That is, an arbitrary surface or cross section of a WC-based cemented carbide cutting tool is ion-milled, and the processed surface is observed with a scanning electron microscope (SEM) equipped with a backscattering electron diffractometer (EBSD). I do.
  • SEM scanning electron microscope
  • EBSD backscattering electron diffractometer
  • the ⁇ phase (5) has an fcc structure, it cannot be separated from the bound phase (fcc) (4), and is actually as the bound phase (fcc) (4) + ⁇ phase (5). Be identified.
  • the length of the interface is defined as the WC-WC interface (2) length L1.
  • the length of the interface where the WC (1) grain and the bound phase (hcp) (3) are adjacent to each other is the length of the WC-bonded phase (hcp) interface (6) length L2-1.
  • the length of the interface where the WC (1) grain and (bonded phase (fcc) (4) + ⁇ phase (5)) are adjacent to each other is defined as WC- (bonded phase (fcc) + ⁇ phase) interface (7) length L2-2. do.
  • L2 which is the WC- (bonded phase + ⁇ phase) interface length, is the sum of L2-1 and L2-2.
  • the average particle size D ( ⁇ m) of the WC particles is preferably 1.0 ⁇ m to 4.0 ⁇ m. By setting the average particle size D of the WC particles in this range, it is possible to obtain a WC-based cemented carbide sintered body structure in which plastic deformation due to the ascending motion of blade-shaped dislocations at a high temperature is unlikely to occur.
  • the average particle size D ( ⁇ m) of the WC particles is more preferably in the range of 1.6 to 3.0 ⁇ m or less.
  • the average particle size D ( ⁇ m) of the WC particles is obtained by ion-milling an arbitrary surface or cross section of a WC-based cemented carbide cutting tool in the same manner as when deriving the average particle size of the ⁇ phase.
  • the machined surface is determined by measuring with an SEM equipped with EBSD. That is, the area of at least 4000 individual WC particles in the observation area is determined by setting measurement points at intervals of 0.1 ⁇ m in the two-dimensional direction in a field having a size of 1 field of 24 ⁇ m ⁇ 72 ⁇ m.
  • the measurement is performed, the WC particles are approximated to a circle having the same area, the area ratio occupied by the WC particles having the diameter is calculated together with the diameter, and the sum of the values obtained by multiplying the diameter and the area ratio of each WC particle is obtained.
  • Relationship between WC-WC interface length ratio (R), bonded phase area ratio (V), WC area average particle size (D) and theoretical volume ratio (V ⁇ ) of ⁇ phase WC-WC interface length ratio (R) ) Is a relational expression defined by the area ratio (V) (%) of the bonded phase, the WC area average particle size (D) ( ⁇ m), and the theoretical volume ratio (V ⁇ ) of the ⁇ phase, that is, R ⁇ (0). It is preferable to satisfy .76-0.059 ⁇ D) ⁇ (10 / V) ⁇ V ⁇ ⁇ 0.06. When this relationship is satisfied, it exhibits excellent plastic deformation resistance and chipping resistance.
  • the WC-based cemented carbide cutting tool according to the present embodiment can be manufactured, for example, through the following steps (1) to (3).
  • the ratio of the most frequent values of the particle size distribution that is, r2 / r1 satisfies 0.15 to 0.60 for the blending of the two types of WC powders.
  • This solid phase sintering step may be continuously performed after sintering, or may be performed once cooling is completed.
  • atmosphere an inert gas, a reducing gas atmosphere, or the like can be used, but it is preferable to carry out the atmosphere under vacuum.
  • Ti-Al-based, Al-Cr-based carbides, nitrides, carbonitrides or Al 2 O 3, or the like coating layer May be produced by forming a coating by a film forming method such as PVD or CVD to produce a cutting tool made of a surface-coated WC-based cemented carbide.
  • a film forming method such as PVD or CVD to produce a cutting tool made of a surface-coated WC-based cemented carbide.
  • the type of film and the film forming method may be those already well known to those skilled in the art.
  • An example was prepared by the following procedure.
  • Table 1 shows the compounding composition (mass%) of various powders, and also shows the mode values and the ratios of the particle size distributions of the two types of WC powders.
  • the average particle size (D50) of the Co powder, Cr 3 C 2 powder, TaC powder, NbC powder, TiC powder, and ZrC powder was all in the range of 1.0 to 3.0 ⁇ m. Further, the unavoidable impurities were 0.3% by mass or less as an outside number when the entire cutting tool made of WC-based cemented carbide was taken as 100% by mass.
  • Comparative Examples 11 to 18 For comparison, WC-based cemented carbide cutting tools 11 to 18 (hereinafter referred to as Comparative Examples 11 to 18) shown in Table 6 were manufactured.
  • the blending composition (mass%), mixing conditions, or sintering conditions were changed with respect to the examples.
  • the unavoidable impurities were 0.3% by mass or less as an outside number when the entire cutting tool made of WC-based cemented carbide was taken as 100% by mass.
  • the bonded phase area ratio V (%) in the cross section of the WC-based cemented carbide cutting tool of Examples 1 to 10 and Comparative Examples 11 to 18, a field of view containing 300 or more WC particles per field of view. In, three visual fields are selected, an observation image is taken using an FE-SEM (field emission scanning electron microscope), binarized by image processing, the WC particle + ⁇ phase and the bound phase are separated, and the bound phase is separated. The area ratio of was calculated. The results are shown in Tables 5 and 6.
  • the area of each ⁇ phase was measured in the vertical cross section of the WC-based cemented carbide cutting tool of Examples 1 to 10 and Comparative Examples 11 to 18 by the method described above, and ⁇ was measured. The average particle size of the phase was calculated. The results are shown in Tables 5 and 6.
  • V ⁇ volume fraction
  • the amount of plastic deformation of the flank of the cutting edge after the wet continuous cutting test was measured, and the state of wear of the cutting edge was observed.
  • the amount of plastic deformation of the flank surface of the cutting edge (10) is determined by scooping the flank surface (8) on the main cutting edge side of the tool with the flank surface (8) on the main cutting edge side at a position sufficiently distant from the cutting edge (9).
  • a line segment (11) is drawn on the ridge line where the surfaces (12) intersect, and the same line segment is extended in the direction of the cutting edge portion, and the distance between the extended line segment and the ridge line of the cutting edge portion (vertical direction of the extended line segment). ) was measured and used as the flank plastic deformation amount (10) of the cutting edge. Further, when the flank plastic deformation amount was 0.04 mm or more, the worn state was defined as the cutting edge deformation (see FIG. 2). Table 7 shows the measurement results.
  • a coating layer having an average layer thickness shown in Table 8 was formed on the cutting edge surfaces of Examples 1 to 4 and Comparative Examples 11 to 14 by a PVD method or a CVD method, and Examples 21 to 24 and Comparative Examples 31 to 31 to were formed. 34 was made.
  • Cutting conditions Work material: JIS / SUS304 (HB170) round bar Cutting speed: 150 m / min Notch: 2.0 mm Feed: 0.7mm / rev Cutting time: 5 minutes Wet water-soluble cutting oil used Table 9 shows the results of the cutting test.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cutting Tools, Boring Holders, And Turrets (AREA)
  • Powder Metallurgy (AREA)
PCT/JP2021/010161 2020-03-26 2021-03-12 Ｗｃ基超硬合金製切削工具 WO2021193159A1 (ja)

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JP2022509932A JPWO2021193159A1 (de) 2020-03-26 2021-03-12
EP21776329.1A EP4129540A4 (de) 2020-03-26 2021-03-12 Schneidwerkzeug aus zementiertem carbid auf wc-basis

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JP2020056624 2020-03-26
JP2020-056624 2020-03-26

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998027241A1 (fr) * 1996-12-16 1998-06-25 Sumitomo Electric Industries, Ltd. Carbure fritte, procede de production de celui-ci et outils en carbure fritte
JP2013244590A (ja) * 2012-05-29 2013-12-09 Sumitomo Electric Ind Ltd 超硬合金からなる切削工具用基材およびこれを用いた表面被覆切削工具
JP2014005529A (ja) * 2012-05-29 2014-01-16 Sumitomo Electric Ind Ltd 超硬合金およびこれを用いた表面被覆切削工具
JP2017088999A (ja) 2015-11-11 2017-05-25 三菱日立ツール株式会社 超硬合金およびこれを用いた切削加工用工具並びにミーリング加工用インサート
JP2017179433A (ja) 2016-03-29 2017-10-05 三菱マテリアル株式会社 耐熱塑性変形性にすぐれたｗｃ基超硬合金製工具
JP6256415B2 (ja) 2014-06-19 2018-01-10 住友電気工業株式会社 超硬合金、および切削工具
JP2020056624A (ja) 2018-09-28 2020-04-09 日本電産トーソク株式会社 リング磁石および磁気センサ

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0665308B1 (de) * 1993-08-16 2000-01-05 Sumitomo Electric Industries, Ltd. Gesinterte karbidlegierungen für schneidwerkzeuge und beschichtete gesinterte karbidlegierung
US11332810B2 (en) * 2018-01-09 2022-05-17 Sumitomo Electric Hardmetal Corp. Cemented carbide and cutting tool

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998027241A1 (fr) * 1996-12-16 1998-06-25 Sumitomo Electric Industries, Ltd. Carbure fritte, procede de production de celui-ci et outils en carbure fritte
JP2013244590A (ja) * 2012-05-29 2013-12-09 Sumitomo Electric Ind Ltd 超硬合金からなる切削工具用基材およびこれを用いた表面被覆切削工具
JP2014005529A (ja) * 2012-05-29 2014-01-16 Sumitomo Electric Ind Ltd 超硬合金およびこれを用いた表面被覆切削工具
JP6256415B2 (ja) 2014-06-19 2018-01-10 住友電気工業株式会社 超硬合金、および切削工具
JP2017088999A (ja) 2015-11-11 2017-05-25 三菱日立ツール株式会社 超硬合金およびこれを用いた切削加工用工具並びにミーリング加工用インサート
JP2017179433A (ja) 2016-03-29 2017-10-05 三菱マテリアル株式会社 耐熱塑性変形性にすぐれたｗｃ基超硬合金製工具
JP2020056624A (ja) 2018-09-28 2020-04-09 日本電産トーソク株式会社 リング磁石および磁気センサ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
G. V. SAMSONOVI. M. VUJNICKI: "Databook of High Melting Point Compounds", TRANSLATION BY JAPAN-SOVIET NEWS AGENCY, December 1977 (1977-12-01)
See also references of EP4129540A4

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JPWO2021193159A1 (de) 2021-09-30
EP4129540A1 (de) 2023-02-08

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