JP2021050405A - 転がり軸受 - Google Patents
転がり軸受 Download PDFInfo
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- JP2021050405A JP2021050405A JP2019175946A JP2019175946A JP2021050405A JP 2021050405 A JP2021050405 A JP 2021050405A JP 2019175946 A JP2019175946 A JP 2019175946A JP 2019175946 A JP2019175946 A JP 2019175946A JP 2021050405 A JP2021050405 A JP 2021050405A
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- crystal grains
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- rolling
- hardened layer
- martensite crystal
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- 238000005096 rolling process Methods 0.000 title claims abstract description 169
- 239000013078 crystal Substances 0.000 claims abstract description 209
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 175
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 58
- 239000000523 sample Substances 0.000 description 35
- 230000002093 peripheral effect Effects 0.000 description 33
- 230000003068 static effect Effects 0.000 description 20
- 238000000034 method Methods 0.000 description 15
- 238000005496 tempering Methods 0.000 description 15
- 238000012360 testing method Methods 0.000 description 10
- 238000009661 fatigue test Methods 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 9
- 238000005255 carburizing Methods 0.000 description 8
- 238000007373 indentation Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000005121 nitriding Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000010723 turbine oil Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010273 cold forging Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009689 gas atomisation Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- FXNGWBDIVIGISM-UHFFFAOYSA-N methylidynechromium Chemical group [Cr]#[C] FXNGWBDIVIGISM-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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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
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- C23C8/28—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 more than one element being applied in one step
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- F16C33/583—Details of specific parts of races
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- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- F16C2204/60—Ferrous alloys, e.g. steel alloys
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Abstract
Description
以下に、実施形態に係る転がり軸受(以下「転がり軸受100」とする)の構成を説明する。
以下に、第1変形例に係る転がり軸受(「転がり軸受200」とする)及び第2変形例に係る転がり軸受(「転がり軸受300」とする)の構成を説明する。ここでは、転がり軸受100の構成と異なる点を主に説明し、重複する説明は繰り返さないものとする。
以下に、転がり軸受100の効果を説明する。
転動疲労試験及び静的負荷容量試験には、サンプル1、サンプル2及びサンプル3が用いられた。サンプル1及びサンプル2は、SUJ2で構成された。サンプル3は、JIS規格(JIS G 4053:2016)に定めるクロムモリブデン鋼であるSCM435で構成された。
転動疲労試験においては、サンプル1及びサンプル3を用いて内輪、外輪及び円錐ころを準備し、これらを用いて円錐ころ軸受を作製した。転動疲労試験は、内輪の回転数が3000回/min、最大接触面圧が2.6GPaとの条件で行われた。転動疲労試験における潤滑は、タービン油であるVG56を用いた湯浴潤滑により行われた。このタービン油には、硬質ガスアトマイズ粉が0.2g/lの比率で混入された。転動疲労試験の試験条件は、表3に示されている。なお、転動疲労試験は、6個のサンプル1を用いて作製された円錐ころ軸受及び6個のサンプル3を用いて作製された円錐ころ軸受に対して行われた。
静的負荷容量試験においては、サンプル1〜サンプル3を用いて平板状部材が作製された。静的負荷容量試験においては、鏡面仕上げがなされた平板状部材の面に窒化珪素製のセラミック球を押し付けて最大接触面圧と圧痕深さとの関係を得ることにより行われた。なお、静的負荷容量は、圧痕深さをセラミック球の直径で除した値が1/10000に達した際の(圧痕深さをセラミック球の直径で除し、さらに10000を乗じた値が1に達した際の)最大接触面圧により評価した。
サンプル1を用いて準備した円錐ころ軸受においては、L50寿命(50パーセント破損寿命)が50.4時間であった。他方で、サンプル3を用いて準備した円錐ころ軸受においては、L50寿命が31.2時間であった。このように、サンプル1を用いて円錐ころ軸受を作製した場合、サンプル3を用いて円錐ころ軸受を作製した場合と比較して、転動疲労寿命が2倍以上に改善された。この試験結果は、表4に示されている。
図11は、最大接触面圧と圧痕深さとの関係が示されるグラフである。図11においては、横軸が最大接触面圧(単位:GPa)となっており、縦軸が圧痕深さ÷セラミック球の直径×104となっている。図11に示されるように、サンプル1に対応する曲線は、サンプル2及びサンプル3に対応する曲線よりも、縦軸の値が1となる際の最大接触面圧の値が大きくなっていた。すなわち、サンプル1においては、静的負荷容量の値が、サンプル2及びサンプル3よりも大きくなっていた。
Claims (7)
- 鋼で形成された内輪、外輪及び転動体を備え、前記内輪の内輪軌道面、前記外輪の外輪軌道面及び前記転動体の転動面の少なくともいずれかに焼き入れ硬化層を有する転がり軸受であって、
前記転がり軸受は、円錐ころ軸受、円筒ころ軸受又は深溝玉軸受であり、
前記焼き入れ硬化層は、複数のマルテンサイト結晶粒と、複数のオーステナイト結晶粒とを含み、
前記焼き入れ硬化層中における前記マルテンサイト結晶粒の総面積の比率は、70パーセント以上であり、
前記マルテンサイト結晶粒は、第1群と、第2群とに区分され、
前記第1群に属する前記マルテンサイト結晶粒の結晶粒径の最小値は、前記第2群に属する前記マルテンサイト結晶粒の最大値よりも大きく、
前記第1群に属する前記マルテンサイト結晶粒の総面積を前記マルテンサイト結晶粒の総面積で除した値は0.5以上であり、
前記第1群に属する結晶粒径が最も小さい前記マルテンサイト結晶粒を除いた前記第1群に属する前記マルテンサイト結晶粒の総面積を前記マルテンサイト結晶粒の総面積で除した値は0.5未満であり、
前記第1群に属する前記マルテンサイト結晶粒の平均粒径は0.97μm以下であり、
転がり面軸方向中央位置にある前記焼き入れ硬化層の表面において、前記焼き入れ硬化層の硬さは、670Hv以上であり、
前記転がり面軸方向中央位置にある前記焼き入れ硬化層の前記表面において、前記焼き入れ硬化層中の前記オーステナイト結晶粒の体積比率は、30パーセント以下である、転がり軸受。 - 前記第1群に属する前記マルテンサイト結晶粒の平均アスペクト比は、2.57以下である、請求項1に記載の転がり軸受。
- 鋼で形成された内輪、外輪及び転動体を備え、前記内輪の内輪軌道面、前記外輪の外輪軌道面及び前記転動体の転動面の少なくともいずれかに焼き入れ硬化層を有する転がり軸受であって、
前記転がり軸受は、円錐ころ軸受、円筒ころ軸受又は深溝玉軸受であり、
前記焼き入れ硬化層は、複数のマルテンサイト結晶粒と、複数のオーステナイト結晶粒とを含み、
前記焼き入れ硬化層中における前記マルテンサイト結晶粒の総面積の比率は、70パーセント以上であり、
前記マルテンサイト結晶粒は、第3群と、第4群とに区分され、
前記第3群に属する前記マルテンサイト結晶粒の結晶粒径の最小値は、前記第4群に属する前記マルテンサイト結晶粒の最大値よりも大きく、
前記第3群に属する前記マルテンサイト結晶粒の総面積を前記マルテンサイト結晶粒の総面積で除した値は0.7以上であり、
前記第3群に属する結晶粒径が最も小さい前記マルテンサイト結晶粒を除いた前記第3群に属する前記マルテンサイト結晶粒の総面積を前記マルテンサイト結晶粒の総面積で除した値は0.7未満であり、
前記第3群に属する前記マルテンサイト結晶粒の平均粒径は0.75μm以下であり、
転がり面軸方向中央位置にある前記焼き入れ硬化層の表面において、前記焼き入れ硬化層の硬さは、670Hv以上であり、
前記転がり面軸方向中央位置にある前記焼き入れ硬化層の前記表面において、前記焼き入れ硬化層中の前記オーステナイト結晶粒の体積比率は、30パーセント以下である、転がり軸受。 - 前記第3群に属する前記マルテンサイト結晶粒の平均アスペクト比は、2.45以下である、請求項3に記載の転がり軸受。
- 前記焼き入れ硬化層は、窒素を含有しており、
前記表面と前記表面からの距離が10μmとなる位置との間での前記焼き入れ硬化層の平均窒素濃度は、0.05質量パーセント以上である、請求項1〜請求項4のいずれか1項に記載の転がり軸受。 - 前記表面と前記表面からの距離が10μmとなる位置との間での前記焼き入れ硬化層の平均炭素濃度は、0.5質量パーセント以上である、請求項1〜請求項5のいずれか1項に記載の転がり軸受。
- 前記鋼は、JIS規格に定める高炭素クロム軸受鋼SUJ2である、請求項1〜請求項6のいずれか1項に記載の転がり軸受。
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