JP6139605B2 - ピストンリング及びその製造方法 - Google Patents
ピストンリング及びその製造方法 Download PDFInfo
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- JP6139605B2 JP6139605B2 JP2015142692A JP2015142692A JP6139605B2 JP 6139605 B2 JP6139605 B2 JP 6139605B2 JP 2015142692 A JP2015142692 A JP 2015142692A JP 2015142692 A JP2015142692 A JP 2015142692A JP 6139605 B2 JP6139605 B2 JP 6139605B2
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- piston ring
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- 238000004519 manufacturing process Methods 0.000 title claims description 9
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 43
- 229910019142 PO4 Inorganic materials 0.000 claims description 42
- 239000010452 phosphate Substances 0.000 claims description 42
- 238000006243 chemical reaction Methods 0.000 claims description 35
- 239000000126 substance Substances 0.000 claims description 35
- 150000004767 nitrides Chemical class 0.000 claims description 31
- 239000000463 material Substances 0.000 claims description 29
- 238000005121 nitriding Methods 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 229910045601 alloy Inorganic materials 0.000 claims description 16
- 239000000956 alloy Substances 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- IQBJFLXHQFMQRP-UHFFFAOYSA-K calcium;zinc;phosphate Chemical compound [Ca+2].[Zn+2].[O-]P([O-])([O-])=O IQBJFLXHQFMQRP-UHFFFAOYSA-K 0.000 claims description 13
- 229910052804 chromium Inorganic materials 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 9
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 229910052720 vanadium Inorganic materials 0.000 claims description 8
- 238000007739 conversion coating Methods 0.000 claims description 7
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 32
- 238000012360 testing method Methods 0.000 description 18
- 238000009792 diffusion process Methods 0.000 description 14
- 239000013078 crystal Substances 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 10
- 239000011651 chromium Substances 0.000 description 10
- 229920005989 resin Polymers 0.000 description 10
- 239000011347 resin Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000000137 annealing Methods 0.000 description 4
- CPSYWNLKRDURMG-UHFFFAOYSA-L hydron;manganese(2+);phosphate Chemical compound [Mn+2].OP([O-])([O-])=O CPSYWNLKRDURMG-UHFFFAOYSA-L 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 4
- 229910000165 zinc phosphate Inorganic materials 0.000 description 4
- 229910000851 Alloy steel Inorganic materials 0.000 description 3
- 238000009661 fatigue test Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910021385 hard carbon Inorganic materials 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000005491 wire drawing Methods 0.000 description 2
- 229910017112 Fe—C Inorganic materials 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000007746 phosphate conversion coating Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000011176 pooling Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
- F16J9/22—Rings for preventing wear of grooves or like seatings
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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
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- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
- C23C22/22—Orthophosphates containing alkaline earth metal cations
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- 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
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/36—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases using ionised gases, e.g. ionitriding
- C23C8/38—Treatment of ferrous surfaces
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/48—Nitriding
- C23C8/50—Nitriding of ferrous surfaces
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F5/00—Piston rings, e.g. associated with piston crown
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/20—Other cylinders characterised by constructional features providing for lubrication
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
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Description
材料組成が、質量%で、C:0.52%、Si:0.27%、Mn:0.81%、Cr:0.95%、V:0.18%、残部がFe及び不可避的不純物である鋼材を10 kg真空誘導溶解炉を用いて溶製した。熱間加工を経て直径10 mmφの線状素材にし、さらに伸線して最終的に厚さ2.3 mm、幅1.0 mmの断面形状が矩形の線材を準備した。ここで、伸線工程の途中に700℃、60分の焼鈍工程を挟んだ。また、オイルテンパー処理は、930℃、45秒の加熱から60℃へのオイル焼き入れと、470℃、60秒の焼き戻しからなる処理とした。上記の線材から呼称径73 mmφの圧力リングを150本成形し、450℃、60分の歪取り熱処理を行った。さらに、外周面にイオンプレーティングによるCrN皮膜を形成した。
実施例1及び比較例1の圧力リングを切断し、断面を鏡面研磨後、側面の窒化層について、窒化拡散層と化成処理皮膜の界面(比較例1では最表面)より20μmの位置から20μm毎に100μmの深さまで、マイクロビッカース硬度(HV0.05)の測定を行った。また、得られた結果から、20〜40μmの間の硬度減少率と40〜60μmの間の硬度減少率を計算により求めた。結果を表1に示す。なお、実施例1及び比較例1の母材の硬度は、平均値で438 HV1であり、窒化前の硬度の平均値463 HV1に対し、94.6%であった。
特許文献2で指摘されたリン酸塩皮膜がピストンリングの疲労強度を低下させるという問題点を考慮し、本発明の窒化拡散層の上に形成されたリン酸塩皮膜の疲労強度への影響を確認するため、図6のリング疲労試験機を用いて疲労試験を行った。疲労試験は、合口両端を切断して自由合口寸法を広げたピストンリングを、リング呼称径迄閉じた状態で試験機にセットし、この状態からさらに閉じ方向に、偏心カムによって負荷応力分のストロークを繰り返し与えることによってリングを折損させ、折損時の応力負荷回数を求めるものである。疲労強度は「S-N線図において繰り返し回数107回まで折損しない最大応力」として定義され、呼称径迄閉じたときの応力(f2)と負荷応力の和となる。実施例1及び比較例1〜2の圧力リングは、f2が307 MPaであり、疲労強度は、実施例1が980 MPa、比較例1が985 MPa、比較例2が730 MPaであった。すなわち、窒化層の上にリン酸塩化成処理を施した圧力リング(実施例1)は、化成処理なしの圧力リング(比較例1)と疲労強度が同程度であるのに対し、窒化層を形成することなくリン酸塩化成処理を施した圧力リング(比較例2)は、疲労強度が約25%低下していることが分かった。
実施例1の圧力リングをトップリングとして、1.5リットル4気筒のガソリンエンジンを用いて、第1気筒及び第2気筒に実施例1の圧力リング、第3気筒に比較例1の圧力リング、第4気筒に比較例2の圧力リングを装着し、所定の運転条件で300時間のエンジン試験を行った。セカンドリング及びオイルリングは、当該エンジン用の既存のリングを使用した。トップリングの下側面摩耗量を測定した結果、実施例1が平均で1.7μm、比較例1が14μm、比較例2が1.0μmであった。トップリング側面に窒化層が存在してもリン酸塩化成処理を行わなかった場合は、耐摩耗性が著しく低下したのに対し、ピストンリング側面に窒化層が存在しなくてもリン酸塩化成処理を施した場合は、優れた耐摩耗性を示した。
リン酸亜鉛カルシウム系の化成処理を、それぞれ全酸度を40〜60ポイントの間で変化させた以外は実施例1と同様にして、実施例2〜3(全酸度は、それぞれ40ポイント、50ポイント)及び比較例3(全酸度60ポイント)の圧力リングを作製した。
化成処理をリン酸マンガン系に変更し、それぞれ全酸度を5〜35ポイントの間で変化させた以外は実施例1と同様にして、実施例4〜5(全酸度はそれぞれ35ポイント、20ポイント)及び比較例4(全酸度は10ポイント)の圧力リングを作製した。
材料組成が、質量%で、C:0.60%、Si:1.35%、Mn:0.70%、Cr:0.73%、残部がFe及び不可避的不純物である鋼材からなり、厚さ2.3 mm、幅1.0 mmの断面形状が矩形の線材を使用した以外は実施例1と同様にして、実施例6の圧力リングを製作した。
材料組成が、質量%で、C:0.60%、Si:1.90%、Mn:0.70%、Cr:0.85%、V:0.10、Ni:0.21%、残部がFe及び不可避的不純物である鋼材からなり、厚さ2.3 mm、幅1.0 mmの断面形状が矩形の線材を使用した以外は実施例1と同様にして、実施例7の圧力リングを製作した。
Claims (11)
- 少なくとも上下側面の一方に窒化層を形成した鋼製のピストンリングであって、前記窒化層を形成するピストンリングの母材が、C、Si、Mn、Crを必須合金元素、Mo、V、Bを選択合金元素として含む鋼よりなり、前記必須合金元素の組成が、質量%で、C:0.45〜0.65%、Si:0.15〜0.35%、Mn:0.65〜1.00%、Cr:0.60〜1.10%であり、前記選択合金元素の組成が、質量%で、Mo:0.35%未満、V:0.25%未満、B:0.001%未満であり、前記必須合金元素と前記選択合金元素の組成和が質量%で3.0%未満であり、前記窒化層が粒状及び芋虫状表面形態の少なくとも一つを含むことを特徴とするピストンリング。
- 請求項1に記載のピストンリングにおいて、前記粒状表面形態の粒径及び前記芋虫状表面形態の短径の平均径が3〜40μmの範囲内にあることを特徴とするピストンリング。
- 請求項1又は2に記載のピストンリングにおいて、前記窒化層の表面粗さ曲線の最大高さRzが2.5〜6μmであることを特徴とするピストンリング。
- 請求項1〜3のいずれかに記載のピストンリングにおいて、前記窒化層の上にリン酸塩化成処理皮膜が残っていることを特徴とするピストンリング。
- 請求項4に記載のピストンリングにおいて、前記リン酸塩化成処理皮膜がリン酸亜鉛カルシウム皮膜であることを特徴とするピストンリング。
- 請求項1〜5のいずれかに記載のピストンリングにおいて、前記窒化層の最表面から30μmの深さまで、硬度が700 HV0.05以上であることを特徴とするピストンリング。
- 請求項6に記載のピストンリングにおいて、前記窒化層の最表面から30μmの深さまで、深さ方向の硬度減少率が3 HV0.05/μm以下であることを特徴とするピストンリング。
- 請求項1〜7のいずれかに記載のピストンリングにおいて、前記母材の硬度が窒化処理前の硬度の90〜100%であることを特徴とするピストンリング。
- 請求項1〜8のいずれかに記載のピストンリングを製造する方法であって、鋼製の線材からピストンリング成形後に、少なくとも上下側面の一方に窒化処理を行い、さらにリン酸塩化成処理を行うことを特徴とするピストンリングの製造方法。
- 請求項9に記載のピストンリングの製造方法において、前記リン酸塩化成処理がリン酸亜鉛カルシウム処理であることを特徴とするピストンリングの製造方法。
- 請求項10に記載のピストンリングの製造方法において、前記リン酸亜鉛カルシウム処理が処理温度75〜95℃及び全酸度30〜55ポイントの条件で行われることを特徴とするピストンリングの製造方法。
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EP0295111B1 (en) * | 1987-06-11 | 1994-11-02 | Aichi Steel Works, Ltd. | A steel having good wear resistance |
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