WO2019223491A1 - Procédé de fabrication de vilebrequin à haute résistance - Google Patents

Procédé de fabrication de vilebrequin à haute résistance Download PDF

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Publication number
WO2019223491A1
WO2019223491A1 PCT/CN2019/084409 CN2019084409W WO2019223491A1 WO 2019223491 A1 WO2019223491 A1 WO 2019223491A1 CN 2019084409 W CN2019084409 W CN 2019084409W WO 2019223491 A1 WO2019223491 A1 WO 2019223491A1
Authority
WO
WIPO (PCT)
Prior art keywords
furnace
crankshaft
argon
fluidized bed
present
Prior art date
Application number
PCT/CN2019/084409
Other languages
English (en)
Chinese (zh)
Inventor
殷文元
钱祥鑫
Original Assignee
江苏万力机械股份有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 江苏万力机械股份有限公司 filed Critical 江苏万力机械股份有限公司
Publication of WO2019223491A1 publication Critical patent/WO2019223491A1/fr

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Classifications

    • 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
    • C21D9/30—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for crankshafts; for camshafts
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/20—Isothermal quenching, e.g. bainitic hardening
    • 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
    • C21D1/34—Methods of heating
    • C21D1/53—Heating in fluidised beds
    • 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

Definitions

  • the invention relates to the technical field of metal surface treatment, in particular to an austenitic nodular cast iron crankshaft and a treatment method for improving hardness and corrosion resistance.
  • Austempered Ductile Iron also referred to as Austempered Ductile Iron (ADI), also known as Austempered Ductile Iron
  • ADI Austempered Ductile Iron
  • austenite isothermal quenching technology a high-strength, high-toughness isothermally quenched ductile iron with a tensile strength greater than 1000 MPa and an elongation greater than 15% was developed.
  • Isothermally quenched ductile iron also has the characteristics of high strength and high toughness. Its comprehensive mechanical properties are significantly better than ferritic ductile iron and pearlite ductile iron.
  • Isothermally quenched ductile iron is an important progress in strengthening and toughening ductile iron. It is hailed as one of the major achievements in the metallurgy of cast iron in the past 30 years and is expected to replace expensive cast steel and forged workpieces.
  • Isothermal quenching is a process method in quenching heat treatment. It mainly includes two processes of austenitizing and isothermal treatment: first, the casting is heated to a temperature above the A3 line, and is held for a period of time (called austenitizing treatment); and then cooled at a rate greater than that of pearlite formation. The cooling medium is rapidly cooled to the bainite transformation region for isothermal. Different from ordinary quenching and heat treatment, the temperature of the cooling medium (isothermal medium) is higher in the isothermal quenching and heat treatment.
  • the salt bath isothermal quenching process has always been the main method for producing isothermally quenched ductile iron. In addition, it also includes staged cooling, continuous cooling and as-cast, quasi-cast and other production processes.
  • crankshafts produced at home and abroad are generally heated by a well-type resistance furnace after forming.
  • the disadvantage is that the crankshaft is deformed and the oxide scale is thick, forming a protective layer, so that the temperature difference between the inside and outside of the crankshaft is large during the next quenching. Isothermal quenching of the bath is harmful to the human body, pollutes the environment, consumes more energy, and has poor safety.
  • the object of the present invention is to provide a method for producing a crankshaft with high strength, abrasion resistance, oxidation resistance, environmental pollution, and safety, in view of the shortcomings of the prior art.
  • the invention relates to a method for producing a high-strength crankshaft.
  • the formed crankshaft is put into a fluidized bed particle furnace and heated to 900 ° C to perform austenitization, the temperature deviation is ⁇ 5 ° C, and the austenitization time is 30 to 180min;
  • Ammonia gas is introduced into the furnace, and under the protection of ammonia gas, the austenitic stainless steel workpiece is subjected to nitrocarburizing treatment to form an infiltrated layer; and then quenched at 250-360 ° C in a fluidized bed particle furnace.
  • the nitrocarburizing treatment is gas infiltration; the thickness of the infiltration layer is greater than or equal to 10 microns.
  • the high-temperature gas nitrocarburizing time is 2 to 6 hours.
  • the surface hardness of the infiltration layer is greater than 1200 HV.
  • argon gas is introduced to perform nitrocarburizing at the same time as nitrocarburizing with austenite.
  • the continuous argon gas reduces the oxidative atmosphere and can eliminate the source of hydrocyanic acid. It can be used instead of ferrite nitrocarburization, which not only eliminates the pollution of hydrocyanic acid, but also increases the depth of the effective hardened layer.
  • the introduction of argon gas simultaneously improves the hardness and corrosion resistance of the workpiece, and the process of the invention has the characteristics of fast processing speed and simple process, and is suitable for large-scale popularization.
  • the fluidized bed particle furnace is subjected to isothermal quenching at 250-360 ° C.
  • the waste heat is used to immediately cool and then the insulation is performed to achieve isothermal quenching, which can save the conventional heating equipment and media isothermal quenching equipment.
  • the cleaning equipment and its production process not only save money, labor and energy, but also save raw materials, no pollution, and achieve safe production.
  • the fluidized bed particle furnace has the advantages of rapid contact heat and mass transfer, energy saving, and uniform furnace temperature, the crankshaft does not deform, is not easy to be oxidized and decarburized, has a smooth surface, uniform performance after heat treatment, good comprehensive mechanical properties, non-toxic, and no pollution. Environment and production safety.
  • the invention relates to a method for producing a high-strength crankshaft.
  • the formed crankshaft is put into a fluidized bed particle furnace and heated to 900 ° C to perform austenitization, the temperature deviation is ⁇ 5 ° C, and the austenitization time is 30 to 180min;
  • Ammonia gas is introduced into the furnace, and under the protection of ammonia gas, the austenitic stainless steel workpiece is subjected to nitrocarburizing treatment to form an infiltrated layer; and then quenched at 250-360 ° C in a fluidized bed particle furnace.
  • the formed crankshaft was heated to 900 ° C by a fluidized bed particle furnace heating device for austenitizing, and ammonia gas was introduced into the furnace.
  • the flow rate of argon gas was 12 L / min.
  • the austenite was The stainless steel workpiece is subjected to nitrocarburizing treatment to form an infiltrated layer.
  • the thickness of the infiltrated layer is 10 micrometers and the surface hardness of the infiltrated layer is 1200 HV. After one hour, it is released from the furnace and then quenched at 250 ° C in a fluidized bed particle furnace.
  • the formed crankshaft was heated to 900 ° C by a fluidized bed particle furnace heating device for austenitizing, and ammonia gas was introduced into the furnace.
  • the flow rate of argon gas was 16L / min.
  • the austenite was
  • the stainless steel workpiece was subjected to nitrocarburizing treatment to form an infiltration layer.
  • the thickness of the infiltration layer was 15 micrometers, and the surface hardness of the infiltration layer was 1300 HV. After 330 minutes, it was released from the furnace and then quenched at 360 ° C in a fluidized bed particle furnace.
  • the formed crankshaft was heated to 900 ° C by a fluidized bed particle furnace heating device for austenitizing, and ammonia gas was introduced into the furnace.
  • the flow rate of argon gas was 14 L / min.
  • the austenite was The stainless steel workpiece is subjected to nitrocarburizing treatment to form an infiltrated layer.
  • the thickness of the infiltrated layer is 20 micrometers
  • the surface hardness of the infiltrated layer is 1300 HV
  • the furnace is discharged after 300 minutes, and then quenched isothermally in a fluidized bed particle furnace at 360 ° C.
  • argon gas is introduced to perform nitrocarburizing at the same time as nitrocarburizing with austenite.
  • the continuous argon gas reduces the oxidative atmosphere and can eliminate the source of hydrocyanic acid. It can be used instead of ferrite nitrocarburization, which not only eliminates the pollution of hydrocyanic acid, but also increases the depth of the effective hardened layer.
  • the introduction of argon gas simultaneously improves the hardness and corrosion resistance of the workpiece, and the process of the invention has the characteristics of fast processing speed and simple process, and is suitable for large-scale popularization.

Abstract

La présente invention concerne un procédé de fabrication d'un vilebrequin à haute résistance, le procédé consistant : à faire entrer un vilebrequin moulé dans un four à particules à lit fluidisé et à élever la température à 900 °C pour effectuer une austénitisation, l'écart de température étant de ± 5 °C et le temps d'austénitisation étant de 30 à 180 min ; à introduire de l'ammoniac gazeux dans le four et à soumettre une pièce d'acier inoxydable austénitique à un traitement de nitrocarburation sous la protection de l'ammoniac gazeux pour former une couche de diffusion ; puis à effectuer une trempe bainitique dans le four à particules à lit fluidisé entre 250 °C et 360 °C. Le procédé de la présente invention introduit de l'argon pour effectuer une nitrocarburation gazeuse à haute température tout en réalisant une nitrocarburation avec de l'austénite. L'introduction continue d'argon réduit l'atmosphère oxydante, peut éliminer la source de génération d'acide cyanhydrique pour remplacer la nitrocarburation de ferrite, ce qui non seulement élimine les polluants à base d'acide cyanhydrique, mais améliore également la profondeur d'une couche durcie efficace. L'introduction d'argon améliore simultanément la dureté et la résistance à la corrosion d'une pièce, le procédé de la présente invention étant caractérisé par une vitesse de traitement élevée et un procédé simple, et étant approprié pour une adoption et une utilisation à grande échelle.
PCT/CN2019/084409 2018-05-21 2019-04-25 Procédé de fabrication de vilebrequin à haute résistance WO2019223491A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201810485170.1A CN108588386A (zh) 2018-05-21 2018-05-21 一种高强度曲轴的生产方法
CN201810485170.1 2018-05-21

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WO2019223491A1 true WO2019223491A1 (fr) 2019-11-28

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WO (1) WO2019223491A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113355627A (zh) * 2021-06-16 2021-09-07 北京理工大学 一种利用等离子喷涂在复合材料表面制备导电涂层的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108588386A (zh) * 2018-05-21 2018-09-28 江苏万力机械股份有限公司 一种高强度曲轴的生产方法
CN109252023B (zh) * 2018-10-29 2020-08-11 山西北方机械制造有限责任公司 一种基于流态石墨粒子炉加热零件局部淬火的方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB711845A (en) * 1949-11-16 1954-07-14 Renault Improvements in methods of case hardening
CN1424425A (zh) * 2002-12-25 2003-06-18 上海交通大学 复合热处理方法
CN1590568A (zh) * 2003-08-26 2005-03-09 张志祥 整体超强化球墨铸铁曲轴的生产方法
CN102560504A (zh) * 2010-12-15 2012-07-11 上海汇众汽车制造有限公司 提高冲压模具寿命的表面处理复合工艺
CN108588633A (zh) * 2018-05-21 2018-09-28 江苏万力机械股份有限公司 一种中温气体氮碳共渗淬火工艺
CN108588386A (zh) * 2018-05-21 2018-09-28 江苏万力机械股份有限公司 一种高强度曲轴的生产方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB711845A (en) * 1949-11-16 1954-07-14 Renault Improvements in methods of case hardening
CN1424425A (zh) * 2002-12-25 2003-06-18 上海交通大学 复合热处理方法
CN1590568A (zh) * 2003-08-26 2005-03-09 张志祥 整体超强化球墨铸铁曲轴的生产方法
CN102560504A (zh) * 2010-12-15 2012-07-11 上海汇众汽车制造有限公司 提高冲压模具寿命的表面处理复合工艺
CN108588633A (zh) * 2018-05-21 2018-09-28 江苏万力机械股份有限公司 一种中温气体氮碳共渗淬火工艺
CN108588386A (zh) * 2018-05-21 2018-09-28 江苏万力机械股份有限公司 一种高强度曲轴的生产方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113355627A (zh) * 2021-06-16 2021-09-07 北京理工大学 一种利用等离子喷涂在复合材料表面制备导电涂层的方法

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