JP6521130B2 - 被覆切削工具 - Google Patents
被覆切削工具 Download PDFInfo
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- JP6521130B2 JP6521130B2 JP2018064054A JP2018064054A JP6521130B2 JP 6521130 B2 JP6521130 B2 JP 6521130B2 JP 2018064054 A JP2018064054 A JP 2018064054A JP 2018064054 A JP2018064054 A JP 2018064054A JP 6521130 B2 JP6521130 B2 JP 6521130B2
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- layer
- aluminum oxide
- type aluminum
- cutting tool
- oxide layer
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- 238000005520 cutting process Methods 0.000 title claims description 96
- 239000010410 layer Substances 0.000 claims description 200
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 77
- 239000010936 titanium Substances 0.000 claims description 32
- 239000000758 substrate Substances 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 27
- 239000011247 coating layer Substances 0.000 claims description 23
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 21
- 229910052719 titanium Inorganic materials 0.000 claims description 21
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 13
- 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
- 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
- 239000011195 cermet Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000000203 mixture Substances 0.000 description 32
- 238000005229 chemical vapour deposition Methods 0.000 description 18
- 238000012360 testing method Methods 0.000 description 18
- 239000002994 raw material Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 15
- 238000005259 measurement Methods 0.000 description 14
- 238000001816 cooling Methods 0.000 description 12
- 230000007547 defect Effects 0.000 description 12
- 238000011156 evaluation Methods 0.000 description 11
- 229910052739 hydrogen Inorganic materials 0.000 description 10
- 238000005422 blasting Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000002441 X-ray diffraction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000012545 processing Methods 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
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 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
- 238000002230 thermal chemical vapour deposition 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
- 238000004140 cleaning Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 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
- 230000003287 optical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
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- 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
-
- 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
-
- 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
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0272—Deposition of sub-layers, e.g. to promote the adhesion of the main coating
-
- 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
- C23C16/308—Oxynitrides
-
- 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
- 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
- C23C28/048—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 with layers graded in composition or physical properties
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- 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]
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- 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
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- 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
- B23B2228/36—Multi-layered
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (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)
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、更に下記(1)及び(2)で表される条件を満足する、被覆切削工具。
(1)前記α型酸化アルミニウム層において測定される残留応力値σr(単位:GPa)は、前記交差稜線部から、前記第1の界面に向かって測定される位置までの距離が10μm、50μm、100μm、150μm、200μmと離れるに従って、連続的又は段階的に増加する。
(2)前記α型酸化アルミニウム層において測定される残留応力値σf(単位:GPa)は、前記交差稜線部から、前記第2の界面に向かって測定される位置までの距離が10μm、50μm、100μm、150μm、200μmと離れるに従って、連続的又は段階的に増加する。
[2]前記α型酸化アルミニウム層が、下記式(A)で表される条件を満足する、[1]の被覆切削工具。
Sf>Sr…(A)
(上記式中、Sfは、前記α型酸化アルミニウム層において、前記交差稜線部から前記第2の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。上記式中、Srは、前記α型酸化アルミニウム層において、前記交差稜線部から前記第1の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。)
[3]前記α型酸化アルミニウム層が、下記式(B)で表される条件を満足する、請求項1又は2に記載の被覆切削工具。
−0.800≦Sr≦0.300…(B)
(上記式中、Srは、前記α型酸化アルミニウム層において、前記交差稜線部から前記第1の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。)
[4]前記α型酸化アルミニウム層が、下記式(C)で表される条件を満足する、[1]〜[3]のいずれか1つの被覆切削工具。
−0.600≦Sf≦0.400…(C)
(上記式中、Sfは、前記α型酸化アルミニウム層において、前記交差稜線部から前記第2の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。)
[5]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、[1]〜[4]のいずれか1つの被覆切削工具。
[6]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、[1]〜[5]のいずれか1つの被覆切削工具。
[7]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、[6]の被覆切削工具。
[8]前記中間層の平均厚さが、0.1μm以上1.5μm以下である、[7]の被覆切削工具。
[9]前記被覆層の平均厚さが、3.0μm以上30.0μm以下である、[1]〜[8]のいずれか1つの被覆切削工具。
[10]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、前記最外層の平均厚さが、0.1μm以上1.0μm以下である、[1]〜[9]のいずれか1つの被覆切削工具。
[11]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、[1]〜[10]のいずれか1つの被覆切削工具。
(1)残留応力値σr(単位:GPa)は、交差稜線部から、第1の界面に向かって測定される位置までの距離が10μm、50μm、100μm、150μm、200μmと離れるに従って、連続的又は段階的に増加する。
(2)残留応力値σf(単位:GPa)は、交差稜線部から、第2の界面に向かって測定される位置までの距離が10μm、50μm、100μm、150μm、200μmと離れるに従って、連続的又は段階的に増加する。
なお、本明細書における残留応力値は、2D法(多軸応力測定法/フルデバイリングフィッティング法)を用いて測定されるものである。
残留応力値σr及びσfが連続的又は段階的に増加すると、まず、切れ刃に最も近い側の応力が最も小さくなることに起因して、亀裂(クラック)の進展を抑制できる。それと共に、切り屑が、すくい面と逃げ面とが交差する稜線部に接触した際に生じるチッピングを小さくできる。それらの結果、耐欠損性が向上する。また、切れ刃に最も離れた側の応力が最も大きくなることに起因して、ブラスト等で生じる亀裂が減少し、これにより加工中に亀裂がつながることが抑制され、被覆層の粒子が脱落することによる摩耗の進行を抑制できる。その結果、耐摩耗性が向上する。
Sf>Sr…(A)
ここで、上記式(A)中、Sfは、α型酸化アルミニウム層において、交差稜線部から第2の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。Sfは、例えば、第2の界面近傍において交差稜線部と平行な方向の残留応力値である。上記式(A)中、Srは、α型酸化アルミニウム層において、交差稜線部から第1の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。Srは、例えば、第1の界面近傍において交差稜線部と平行な方向の残留応力値である。
−0.800≦Sr≦0.300…(B)
ここで、上記式(B)中、Srは、上記式(A)におけるSrと同義である。
−0.600≦Sf≦0.400…(C)
ここで、上記式(C)中、Sfは、上記式(A)におけるSfと同義である。
被削材:S45Cの丸棒、
切削速度:290m/min、
送り:0.25mm/rev、
切り込み:1.8mm、
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擦幅が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:0.30mm/rev、
切り込み:1.7mm、
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 (11)
- 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、更に下記(1)及び(2)で表される条件を満足する、被覆切削工具。
(1)前記α型酸化アルミニウム層において測定される残留応力値σr(単位:GPa)は、前記交差稜線部から、前記第1の界面に向かって測定される位置までの距離が10μm、50μm、100μm、150μm、200μmと離れるに従って、連続的又は段階的に増加する。
(2)前記α型酸化アルミニウム層において測定される残留応力値σf(単位:GPa)は、前記交差稜線部から、前記第2の界面に向かって測定される位置までの距離が10μm、50μm、100μm、150μm、200μmと離れるに従って、連続的又は段階的に増加する。 - 前記α型酸化アルミニウム層が、下記式(A)で表される条件を満足する、請求項1に記載の被覆切削工具。
Sf>Sr…(A)
(上記式中、Sfは、前記α型酸化アルミニウム層において、前記交差稜線部から前記第2の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。上記式中、Srは、前記α型酸化アルミニウム層において、前記交差稜線部から前記第1の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。) - 前記α型酸化アルミニウム層が、下記式(B)で表される条件を満足する、請求項1又は2に記載の被覆切削工具。
−0.800≦Sr≦0.300…(B)
(上記式中、Srは、前記α型酸化アルミニウム層において、前記交差稜線部から前記第1の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。) - 前記α型酸化アルミニウム層が、下記式(C)で表される条件を満足する、請求項1〜3のいずれか1項に記載の被覆切削工具。
−0.600≦Sf≦0.400…(C)
(上記式中、Sfは、前記α型酸化アルミニウム層において、前記交差稜線部から前記第2の界面に向かって100μm離れた位置で測定される残留応力値(単位:GPa)を表す。) - 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1〜4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1〜5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6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7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1〜8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、前記最外層の平均厚さが、0.1μm以上1.0μm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1〜10のいずれか1項に記載の被覆切削工具。
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