JP2007277648A - 浸炭窒化方法、機械部品の製造方法および機械部品 - Google Patents
浸炭窒化方法、機械部品の製造方法および機械部品 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/06—Surface hardening
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/32—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for gear wheels, worm wheels, or the like
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/36—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for balls; for rollers
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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
- 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
- C23C8/28—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
- C23C8/30—Carbo-nitriding
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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
- 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
- C23C8/28—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
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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Abstract
【解決手段】浸炭窒化方法は、雰囲気制御工程50と、加熱パターン制御工程60とを備えている。雰囲気制御工程50は、未分解NH3分圧制御工程51と、CO/CO2分圧制御工程53とを含んでいる。そして、雰囲気制御工程50においては、定義されるac *の値が0.88以上1.27以下、定義されるαの値が0.012以上0.020以下となるように、未分解NH3分圧制御工程51およびCO/CO2分圧制御工程53が実施される。
【選択図】図7
Description
恒川好樹、外2名、「ガス浸炭窒化処理におけるボイドの発生と窒素の拡散挙動」、熱処理、1985年、25巻、5号、p.242−247
N:窒素濃度
上記浸炭窒化時間および窒素侵入速度qの値と、被処理物の表面から所定の深さの領域における窒素濃度との関係は、被処理物を構成する鋼の組成により決定されるため、当該関係を予め決定しておくことにより、同一組成の被処理物に対しては、被処理物の形状等が変化した場合でも、当該関係に基づいて浸炭窒化時間を決定することができる。これにより、被処理物において重要な所望の深さの領域における窒素含有量を容易に制御することが可能となる。
Claims (8)
- 0.8質量%以上の炭素を含有する鋼からなる被処理物を、アンモニア、一酸化炭素、二酸化炭素および水素を含む雰囲気中で加熱することにより浸炭窒化する浸炭窒化方法であって、
熱処理炉内の雰囲気が制御される雰囲気制御工程と、
前記熱処理炉内において前記被処理物に付与される温度履歴が制御される加熱パターン制御工程とを備え、
前記雰囲気制御工程は、
前記熱処理炉内の未分解アンモニア分圧が制御される未分解NH3分圧制御工程と、
前記熱処理炉内の一酸化炭素および二酸化炭素の少なくともいずれか一方の分圧が制御されるCO/CO2分圧制御工程とを含み、
前記雰囲気制御工程においては、前記熱処理炉内の未分解アンモニア分圧をPN、水素分圧をPHとした場合に、以下の式(1)で定義されるac *が0.88以上1.27以下、式(2)で定義されるαが0.012以上0.020以下となるように、前記未分解NH3分圧制御工程および前記CO/CO2分圧制御工程が実施される、浸炭窒化方法。
- 前記未分解NH3分圧制御工程では、前記熱処理炉内の未分解アンモニア分圧が測定され、前記未分解アンモニア分圧と、前記αの値が0.012以上0.020以下の範囲となる目標の未分解アンモニア分圧とが比較されて、前記熱処理炉内に供給される単位時間あたりのアンモニアの流量が調節される、請求項1に記載の浸炭窒化方法。
- 前記雰囲気制御工程は、前記熱処理炉内の水素分圧を制御するH2分圧制御工程をさらに含み、
前記H2分圧制御工程では、前記熱処理炉内に供給される水素の単位時間あたりの流量が調節される、請求項1または2に記載の浸炭窒化方法。 - 前記H2分圧制御工程では、前記熱処理炉内の水素分圧が測定され、前記水素分圧と、前記αの値が0.012以上0.020以下の範囲となる目標の水素分圧とが比較されて、前記熱処理炉内に供給される水素の単位時間あたりの流量が調節される、請求項3に記載の浸炭窒化方法。
- 0.8質量%以上の炭素を含有する鋼からなり、機械部品の概略形状に成形された鋼製部材を準備する鋼製部材準備工程と、
前記鋼製部材準備工程において準備された前記鋼製部材に対して、浸炭窒化処理を実施した後、A1点以上の温度からMS点以下の温度へ冷却することにより、前記鋼製部材を焼入硬化する焼入硬化工程とを備え、
前記焼入硬化工程における前記浸炭窒化処理は、請求項1〜5のいずれか1項に記載の浸炭窒化方法を用いて実施される、機械部品の製造方法。 - 請求項6に記載の機械部品の製造方法により製造された、機械部品。
- 軸受を構成する部品として用いられる、請求項7に記載の機械部品。
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JP2006106330A JP4191745B2 (ja) | 2006-04-07 | 2006-04-07 | 浸炭窒化方法、機械部品の製造方法および機械部品 |
US12/296,054 US9062355B2 (en) | 2006-04-07 | 2007-04-03 | Carbonitriding method, machinery component fabrication method, and machinery component |
PCT/JP2007/057438 WO2007116875A1 (ja) | 2006-04-07 | 2007-04-03 | 浸炭窒化方法、機械部品の製造方法および機械部品 |
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WO2014061699A1 (ja) | 2012-10-17 | 2014-04-24 | Ntn株式会社 | 軸受部品、転がり軸受および軸受部品の製造方法 |
JP2014520957A (ja) * | 2011-06-30 | 2014-08-25 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | 駆動ベルトのリング部品のための製造方法 |
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EP2987873A3 (en) * | 2009-07-22 | 2016-04-13 | NTN Corporation | Method for heat-treating a ring-shaped member, method for producing a ring-shaped member, ring-shaped member, bearing ring, rolling bearing, and method for producing a bearing ring |
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JP4191745B2 (ja) | 2008-12-03 |
US9062355B2 (en) | 2015-06-23 |
US20100154937A1 (en) | 2010-06-24 |
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