JP6521127B2 - 被覆切削工具 - Google Patents
被覆切削工具 Download PDFInfo
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- JP6521127B2 JP6521127B2 JP2018058017A JP2018058017A JP6521127B2 JP 6521127 B2 JP6521127 B2 JP 6521127B2 JP 2018058017 A JP2018058017 A JP 2018058017A JP 2018058017 A JP2018058017 A JP 2018058017A JP 6521127 B2 JP6521127 B2 JP 6521127B2
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- Japan
- Prior art keywords
- layer
- aluminum oxide
- cutting tool
- type aluminum
- coated cutting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000005520 cutting process Methods 0.000 title claims description 110
- 239000010410 layer Substances 0.000 claims description 218
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 94
- 239000010936 titanium Substances 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 29
- 239000000758 substrate Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 21
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 20
- 229910052719 titanium Inorganic materials 0.000 claims description 20
- 239000011247 coating layer Substances 0.000 claims description 16
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 13
- 238000002441 X-ray diffraction Methods 0.000 claims description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 9
- 229910002090 carbon oxide Inorganic materials 0.000 claims description 5
- 238000000691 measurement method Methods 0.000 claims description 5
- 229910052582 BN Inorganic materials 0.000 claims description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000011195 cermet Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000000203 mixture Substances 0.000 description 36
- 239000002994 raw material Substances 0.000 description 20
- 238000012360 testing method Methods 0.000 description 18
- 230000007547 defect Effects 0.000 description 13
- 238000005229 chemical vapour deposition Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 238000011156 evaluation Methods 0.000 description 9
- 238000005422 blasting Methods 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/12—Organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/148—Composition of the cutting inserts
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/36—Carbonitrides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/40—Oxides
- C23C16/403—Oxides of aluminium, magnesium or beryllium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/56—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
- C23C28/042—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
- C23C28/044—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material coatings specially adapted for cutting tools or wear applications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
- C23C30/005—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process on hard metal substrates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
- B23B2222/28—Details of hard metal, i.e. cemented carbide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2224/00—Materials of tools or workpieces composed of a compound including a metal
- B23B2224/04—Aluminium oxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2224/00—Materials of tools or workpieces composed of a compound including a metal
- B23B2224/36—Titanium nitride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/12—Boron nitride
- B23B2226/125—Boron nitride cubic [CBN]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2226/00—Materials of tools or workpieces not comprising a metal
- B23B2226/18—Ceramic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2228/00—Properties of materials of tools or workpieces, materials of tools or workpieces applied in a specific manner
- B23B2228/10—Coatings
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Chemical Vapour Deposition (AREA)
- Drilling Tools (AREA)
Description
[1]基材と、該基材の表面上に形成された被覆層とを備える被覆切削工具であって、前記被覆切削工具が、すくい面と、逃げ面とを有し、前記被覆層が、α型酸化アルミニウム層を含み、前記α型酸化アルミニウム層が、前記基材とは反対側に、前記すくい面である又は前記すくい面と略平行な面である第1の界面と、前記逃げ面である又は前記逃げ面と略平行な面である第2の界面と、前記第1の界面と前記第2の界面との交差稜線部とを有し、前記α型酸化アルミニウム層が、下記式(A)、(B)及び(C)で表される条件を満足する、被覆切削工具。
−600≦σ11≦300…(A)
−900≦σ22≦250…(B)
σ11>σ22…(C)
(上記式中、σ11は、前記交差稜線部と平行な方向の残留応力値(単位:MPa)を表し、σ22は、前記交差稜線部と直交する方向の残留応力値(単位:MPa)を表し、各前記残留応力値は、多軸応力測定法又はフルデバイリングフィッティング法により測定された値である。)
[2]各前記残留応力値が、前記交差稜線部から前記第1の界面に向かって、50μm離れた位置のα型酸化アルミニウム層で測定された値である、上記被覆切削工具。
[3]σ11が、−600MPa以上0MPa以下であり、σ22が、−900MPa以上−100MPa以下である、上記被覆切削工具。
[4]前記α型酸化アルミニウム層において、下記式(1)で表される(0,0,12)面の組織係数TC(0,0,12)が、4.0以上8.4以下である、上記被覆切削工具。
[5]前記α型酸化アルミニウム層が、下記式(D)で表される条件を満足する、上記被覆切削工具。
σ11−σ22>100…(D)
[6]前記α型酸化アルミニウム層の平均厚さが、1.0μm以上15.0μm以下である、上記被覆切削工具。
[7]前記被覆層が、前記基材と前記α型酸化アルミニウム層との間に、炭窒化チタンからなる炭窒化チタン層を含み、前記炭窒化チタン層の平均厚さが、1.0μm以上20.0μm以下である、上記被覆切削工具。
[8]前記被覆層が、前記炭窒化チタン層と前記α型酸化アルミニウム層との間に、Tiの炭酸化物、Tiの窒酸化物及びTiの炭窒酸化物からなる群より選択される少なくとも1種の化合物からなる中間層を備える、上記被覆切削工具。
[9]前記中間層の平均厚さが、0.1μm以上1.5μm以下である、上記被覆切削工具。
[10]前記被覆層の平均厚さが、3.0μm以上30.0μm以下である、上記被覆切削工具。
[11]前記被覆層が、前記α型酸化アルミニウム層の表面上に最外層として、窒化チタンからなる窒化チタン層を備える、上記被覆切削工具。
[12]前記基材は、超硬合金、サーメット、セラミックス及び立方晶窒化硼素焼結体のいずれかである、上記被覆切削工具。
−600≦σ11≦300…(A)
−900≦σ22≦250…(B)
σ11>σ22…(C)
ここで、上記式中、σ11は、交差稜線部と平行な方向の残留応力値(単位:MPa)を表し、σ22は、交差稜線部と直交する方向(σ11と直交する方向)の残留応力値(単位:MPa)を表し、各残留応力値は、多軸応力測定法又はフルデバイリングフィッティング法(以下、まとめて「2D法」とも表記する。)により測定された値である。なお、σ22は、交差稜線部と直交する方向の残留応力値であるが、ここでいう「直交する方向」は、交差稜線部から第1の界面に向かう方向を意味する。
(1)σ11が−600MPa以上であると、α型酸化アルミニウム層の粒子破壊を伴う過度な圧縮応力が抑制されることに起因して、粒子の脱落による摩耗の進行を抑制でき、その結果、耐摩耗性が向上する。また、σ11が300MPa以下であると、亀裂の発生又は進展につながる過度な引張応力が抑制されることに起因して、切削加工中に発生した亀裂が進展するのを抑制でき、その結果、耐欠損性が向上する。
(2)σ22が−900MPa以上であると、α型酸化アルミニウム層の粒子破壊を伴う過度な圧縮応力が抑制されることに起因して、粒子の脱落による摩耗の進行を抑制でき、その結果、耐摩耗性が向上する。また、σ22が250MPa以下であると、亀裂の発生又は進展につながる過度な引張応力が抑制されることに起因して、チッピングのサイズを小さくすることができ、その結果、耐欠損性が向上する。
(3)σ11>σ22であると、交差稜線部と直交する方向への微小な亀裂の進展を抑制できることに起因して、被覆切削工具における切削部と非切削部との境界に生じる損傷を抑制でき、その結果、耐欠損性が向上する。
σ11−σ22>100…(D)
被削材:S45Cの丸棒、
切削速度:290m/min、
送り:0.25mm/rev、
切り込み:2.0mm、
クーラント:有り、
評価項目:試料が欠損に至ったとき又は最大逃げ面摩耗幅が0.2mmに至ったときを工具寿命とし、工具寿命までの加工時間を測定した。なお、欠損に至る前に最大逃げ面摩耗幅が0.2mmに至った場合を「正常摩耗」、欠損に至った場合を「欠損」と評価した。
被削材:SCM415の長さ方向に等間隔で2本の溝入り丸棒、
切削速度:170m/min、
送り:0.35mm/rev、
切り込み:1.5mm、
クーラント:有り、
評価項目:試料が欠損に至ったときを工具寿命とし、工具寿命までの衝撃回数を測定した。衝撃回数は、試料と被削材とが接触した回数とし、試料が欠損に至った時点で試験を終了した。なお、各試料について、5個のインサートを用意し、それぞれ衝撃回数を測定し、それらの衝撃回数の値から相加平均値を求め、工具寿命とした。
Claims (12)
- 基材と、該基材の表面上に形成された被覆層とを備える被覆切削工具であって、
前記被覆切削工具が、すくい面と、逃げ面とを有し、前記被覆層が、α型酸化アルミニウム層を含み、
前記α型酸化アルミニウム層が、前記基材とは反対側に、前記すくい面である又は前記すくい面と略平行な面である第1の界面と、前記逃げ面である又は前記逃げ面と略平行な面である第2の界面と、前記第1の界面と前記第2の界面との交差稜線部とを有し、
前記α型酸化アルミニウム層が、下記式(A)、(B)及び(C)で表される条件を満足する、被覆切削工具。
−600≦σ11≦300…(A)
−900≦σ22≦250…(B)
σ11>σ22…(C)
(上記式中、σ11は、前記交差稜線部と平行な方向の残留応力値(単位:MPa)を表し、σ22は、前記交差稜線部と直交する方向の残留応力値(単位:MPa)を表し、各前記残留応力値は、多軸応力測定法又はフルデバイリングフィッティング法により測定された値である。) - 各前記残留応力値が、前記交差稜線部から前記第1の界面に向かって、50μm離れた位置のα型酸化アルミニウム層で測定された値である、請求項1に記載の被覆切削工具。
- σ11が、−600MPa以上0MPa以下であり、σ22が、−900MPa以上−100MPa以下である、請求項1又は2に記載の被覆切削工具。
- 前記α型酸化アルミニウム層において、下記式(1)で表される(0,0,12)面の組織係数TC(0,0,12)が、4.0以上8.4以下である、請求項1〜3のいずれか1項に記載の被覆切削工具。
- 前記α型酸化アルミニウム層が、下記式(D)で表される条件を満足する、請求項1〜4のいずれか1項に記載の被覆切削工具。
σ11−σ22>100…(D) - 前記α型酸化アルミニウム層の平均厚さが、1.0μm以上15.0μm以下である、請求項1〜5のいずれか1項に記載の被覆切削工具。
- 前記被覆層が、前記基材と前記α型酸化アルミニウム層との間に、炭窒化チタンからなる炭窒化チタン層を含み、
前記炭窒化チタン層の平均厚さが、1.0μm以上20.0μm以下である、請求項1〜6のいずれか1項に記載の被覆切削工具。 - 前記被覆層が、前記炭窒化チタン層と前記α型酸化アルミニウム層との間に、Tiの炭酸化物、Tiの窒酸化物及びTiの炭窒酸化物からなる群より選択される少なくとも1種の化合物からなる中間層を備える、請求項7に記載の被覆切削工具。
- 前記中間層の平均厚さが、0.1μm以上1.5μm以下である、請求項8に記載の被覆切削工具。
- 前記被覆層の平均厚さが、3.0μm以上30.0μm以下である、請求項1〜9のいずれか1項に記載の被覆切削工具。
- 前記被覆層が、前記α型酸化アルミニウム層の表面上に最外層として、窒化チタンからなる窒化チタン層を備える、請求項1〜10のいずれか1項に記載の被覆切削工具。
- 前記基材は、超硬合金、サーメット、セラミックス及び立方晶窒化硼素焼結体のいずれかである、請求項1〜11のいずれか1項に記載の被覆切削工具。
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