WO2022009703A1 - Dispositif de chauffage pour la trempe - Google Patents

Dispositif de chauffage pour la trempe Download PDF

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Publication number
WO2022009703A1
WO2022009703A1 PCT/JP2021/024150 JP2021024150W WO2022009703A1 WO 2022009703 A1 WO2022009703 A1 WO 2022009703A1 JP 2021024150 W JP2021024150 W JP 2021024150W WO 2022009703 A1 WO2022009703 A1 WO 2022009703A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel
heating device
amount
induction heating
heating
Prior art date
Application number
PCT/JP2021/024150
Other languages
English (en)
Japanese (ja)
Inventor
徹 伊藤
Original Assignee
中央発條株式会社
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 中央発條株式会社 filed Critical 中央発條株式会社
Priority to JP2022535024A priority Critical patent/JPWO2022009703A1/ja
Priority to CN202180035610.3A priority patent/CN115917016A/zh
Publication of WO2022009703A1 publication Critical patent/WO2022009703A1/fr

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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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/42—Induction heating
    • 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
    • C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • This disclosure relates to a heating device for tempering steel such as leaf springs.
  • Patent Document 1 As a heating device for tempering steel, a method of heating in a heating furnace, a method of heating by induction heating (see, for example, Patent Document 1) and the like are known.
  • the temperature and heating time in the heating furnace were adjusted according to the size, shape and material of the steel. Therefore, if a plurality of types of steel are tempered in one heating furnace, it is difficult to improve the production efficiency for the following reasons.
  • this disclosure discloses an example of a tempering heating device that can handle tempering of a plurality of types of steel while suppressing an increase in capital investment.
  • the heating device for tempering steel is provided with at least one of the following constituent requirements, for example.
  • the constituent requirements are such that the inside is maintained at a predetermined specific temperature regardless of the size, shape and material of the steel, and the steel is predetermined regardless of the size, shape and material of the steel.
  • a heating furnace (3) that heats only for a long time and an induction heating device (5) that heats the steel before being put into the heating furnace (3) with an induced current, and the size, shape, and material of the steel. It is desirable to provide an induction heating device (5) having a setting unit (52) capable of changing the setting of at least one of the energization time and the energization current value according to at least one of them.
  • the energization time and the energization current value are determined so that the amount of heat applied to the steel from the induction heating device (5) is the induction heating amount (Q1).
  • the induction heating amount (Q1) is the amount of heat obtained by subtracting the heating amount (Q2) in the furnace from the required heat amount ( ⁇ Q).
  • the required heat quantity ( ⁇ Q) is the total heat quantity required for tempering, which is determined by the size, shape and material of the steel.
  • the heating amount in the furnace (Q2) is the amount of heat applied to the steel in the heating furnace (3).
  • the induction heating device (5) imparts the steel to the steel even if the temperature in the heating furnace (3) and the heating time in the heating furnace (3) are constant.
  • the amount of heat that is, the amount of induction heating (Q1) is changed according to the size, shape or material of the steel.
  • the induction heating amount (Q1) can be changed instantaneously, so that there is almost no need to stop the induction heating device in order to change the induction heating amount (Q1). That is, even when tempering a plurality of steels having different sizes, shapes, or materials, almost no downtime occurs.
  • the heating device it may be possible to cope with tempering of a plurality of types of steel while suppressing an increase in capital investment and an increase in installation space. As a result, it will be possible to temper a wide variety of steel while making effective use of existing manufacturing equipment.
  • the reference numeral in each of the parentheses is an example showing a correspondence relationship with the specific configuration and the like described in the embodiment described later, and the present disclosure is not limited to the specific configuration and the like shown in the reference numeral in the parentheses. ..
  • Heating device 3 Heating furnace 5 .
  • Induction heating device 51 Control unit 52 .
  • Setting unit 53 ... Reading unit
  • invention embodiment shows an example of an embodiment belonging to the technical scope of the present disclosure. That is, the matters specifying the invention described in the claims are not limited to the specific configuration, structure, etc. shown in the following embodiments.
  • At least one member or part described with a reference numeral is provided, except when a notice such as "one” is given. That is, if there is no notice such as "one", two or more of the members may be provided.
  • the heating apparatus shown in the present disclosure comprises at least components such as members or parts described with reference numerals, as well as the illustrated structural parts.
  • the heating device 1 includes at least a heating furnace 3 and an induction heating device 5.
  • the heating furnace 3 heats the steel through the atmospheric gas in the furnace.
  • the atmospheric gas in the heating furnace 3 is maintained at a specific temperature regardless of the size, shape or material of the steel.
  • the heating time of the steel that is, the transfer rate of the steel in the heating furnace 3, is maintained at a specific time regardless of the size, shape or material of the steel.
  • the method of heating the atmospheric gas does not matter. That is, any heating furnace may be used, such as a combustion furnace in which heavy oil burns gas, or an electric furnace using the Joule loss of electricity.
  • the heating furnace 3 according to the present embodiment is an electric furnace.
  • the induction heating device 5 generates an induced current in the steel to heat the steel.
  • the induction heating device 5 has an induction coil (not shown) arranged around the steel to be heated, and heats the steel by energizing the induction coil.
  • the induction heating device 5 has at least a control unit 51, a setting unit 52, a reading unit 53, and the like.
  • the control unit 51 controls the induction coil with the energization time and the energization current value set or changed by the setting unit 52.
  • the control unit 51 includes a CPU 51a and a memory 51b that stores an operation program of the CPU 51a.
  • the setting unit 52 sets or changes the energizing time and the energizing current value by using the information read by the reading unit 53.
  • the reading unit 53 reads an identification label (for example, a one-dimensional code or a two-dimensional code) in which information on the size, shape, and material of the steel is described.
  • the heating device 1 heats the steel that has been heat-treated by the induction heating device 5 in the heating furnace 3. That is, the steel is heated while being transferred in the order of the induction heating device 5 ⁇ the heating furnace 3.
  • the heating temperature in the heating furnace 3, that is, the atmospheric gas temperature and the heating time are fixed to a predetermined temperature and time regardless of the size, shape and material of the steel.
  • the heating device 1 that is, the control unit 51, changes at least one of the energization time and the energization current value according to at least one of the size, shape, and material of the steel according to the steel to be heated. ..
  • the control unit 51 changes the energization time according to the steel to be heated.
  • the control unit 51 that is, the setting unit 52 determines the energization time and the energization current value in the induction heating device 5 so that the amount of heat applied to the steel from the induction heating device 5 is the induction heating amount (Q1).
  • the induction heating amount (Q1) is the amount of heat obtained by subtracting the heating amount Q2 in the furnace from the required heat amount ( ⁇ Q).
  • the required heat quantity ( ⁇ Q) is the total heat quantity required for tempering, which is determined by the size, shape and material of the steel.
  • the heating amount in the furnace (Q2) means the amount of heat applied to the steel in the heating furnace 3.
  • the setting unit 52 determines the required heat amount ( ⁇ Q) by using the information about the steel to be heated, and then subtracts the in-core heating amount (Q2) from the required heat amount ( ⁇ Q) to induce the heating amount (Q2). Determine Q1).
  • the heating amount (Q2) in the furnace is stored in advance in the control unit 51 as a predetermined amount of heat.
  • the required heat quantity ( ⁇ Q) is a calorific value determined in advance by an experiment or the like, and the required heat quantity ( ⁇ Q) according to the type of steel, that is, the size, shape and material of the steel is stored in the control unit 51 in advance. ..
  • the setting unit 52 determines the required heat amount ( ⁇ Q) according to the type of steel from the information read by the reading unit 53, and then subtracts the heating amount (Q2) in the furnace from the required heat amount ( ⁇ Q) for induction heating. Determine the amount (Q1).
  • a leaf spring for an automobile is usually used by fastening a central portion to a bolt and a nut in a state where a plurality of leaf springs are superposed. However, at the time of manufacture, each leaf spring is manufactured one by one.
  • Each leaf spring is not necessarily a flat plate shape, but has a cylindrical eyeball portion connected to the vehicle body (frame) of an automobile, or is rolled into a tapered shape and provided with a chamfered cut portion at the tip thereof. There are various shapes such as rolls.
  • the steel heated by the induction heating device 5 is heated in the heating furnace 3 to achieve uniform temperature distribution.
  • the energization time and the energization current value are determined so that the amount of heat applied to the steel from the induction heating device 5 is the induction heating amount (Q1).
  • the induction heating amount (Q1) can be changed instantaneously, so that there is almost no need to stop the induction heating device in order to change the induction heating amount (Q1). That is, even when tempering a plurality of steels having different sizes, shapes, or materials, almost no downtime occurs.
  • the heating device 1 it may be possible to cope with tempering of a plurality of types of steel while suppressing an increase in the amount of capital investment and an increase in the installation space. As a result, it will be possible to temper a wide variety of steel while making effective use of existing manufacturing equipment.
  • the heating device 1 does not require temperature control of the heating furnace 3 when tempering a plurality of types of steel. That is, in the heating device 1, it may be possible to cope with tempering of a plurality of types of steel without stopping the heating device in order to adjust the temperature of the heating furnace 3. As a result, it will be possible to temper a wide variety of steel while making effective use of existing manufacturing equipment.
  • Example 1 FIG. 2 is a diagram showing an example of a leaf spring to be tempered by the heating device 1. 3 and 4 are enlarged views of a part of the leaf spring.
  • the leaf spring of this embodiment is manufactured from a material such as SUP9 and SUP10, and has the shapes shown in Table 1 below.
  • the heating furnace 3 used in the present invention is the same as a normal heating furnace, but the dimension in the flow direction of the work is 50% or less of the dimension. If the dimensions of the heating furnace are 28 m in the flow direction of the work, 3 m in width, and 2.6 m in height, when the present invention is applied, the dimensions in the flow direction of the heating furnace 3 are 14 m. It is as follows. The energy consumption of this heating furnace is about 280,000 kcal when the present invention is not applied, but is about 140,000 kcal or less when the present invention is applied.
  • the target material is heated by the induction heating device 5 before the target material is loaded into the heating furnace 3.
  • the induction heating furnace 5 preferably has an output capacity of 100 kW to 200 kW and a transmission frequency of 400 Hz to 10 kHz.
  • the setting unit 52 determines the energization time and the energization current value by using the information read by the reading unit 53.
  • this disclosure is not limited to this. That is, the disclosure may be, for example, a method of determining the energization time and the energization current value in combination with an imager such as a camera and artificial intelligence, or a method in which an operator inputs necessary information to the setting unit 52. good.
  • the energization current value is fixed and only the energization time is changed according to the steel to be heated.
  • this disclosure is not limited to this. That is, the disclosure is configured such that, for example, the energization time is fixed and only the energization current value is changed according to the steel to be heated, or the energization current value and the energization time are changed according to the steel to be heated. There may be.
  • this disclosure is not limited to this. That is, the disclosure is applicable to other steels such as coil springs.
  • the present disclosure is not limited to the above-described embodiment as long as it conforms to the purpose of the disclosure described in the above-mentioned embodiment. Therefore, either the configuration in which at least two embodiments of the plurality of embodiments described above are combined, or the configuration requirements shown in the illustration or the configuration requirements described with reference numerals in the above-described embodiment are abolished. It may be a configured configuration.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

Un mode de réalisation d'un dispositif de chauffage pour la trempe selon la présente invention est divulgué, ledit dispositif de chauffage pour la trempe étant conçu pour la trempe d'une pluralité de types de matériaux en acier, tout en supprimant une augmentation de l'investissement dans l'équipement. Selon la présente invention, le préchauffage est effectué au moyen d'un dispositif de chauffage par induction avant le chauffage dans un four de chauffage. Par conséquent, même si la température à l'intérieur du four de chauffage et le temps de chauffage dans le four de chauffage sont maintenus constants indépendamment de la dimension, de la forme ou de la qualité d'un matériau en acier, la quantité de chaleur appliquée au matériau en acier provenant du dispositif de chauffage par induction, à savoir la quantité de chauffage par induction, est modifiée en fonction de la dimension, de la forme ou de la qualité du matériau en acier. Comme la quantité de chauffage par induction peut être modifiée immédiatement lorsque le temps d'excitation et la valeur de courant appliquée sont modifiés, le dispositif de chauffage par induction ne doit pratiquement pas être arrêté dans le but de modifier la quantité de chauffage par induction. En d'autres termes, même dans les cas où une pluralité de matériaux en acier qui sont différents les uns des autres en dimension, en forme ou en qualité sont trempés, il n'y a pratiquement aucun temps d'arrêt.
PCT/JP2021/024150 2020-07-09 2021-06-25 Dispositif de chauffage pour la trempe WO2022009703A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2022535024A JPWO2022009703A1 (fr) 2020-07-09 2021-06-25
CN202180035610.3A CN115917016A (zh) 2020-07-09 2021-06-25 回火用加热装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-118384 2020-07-09
JP2020118384 2020-07-09

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WO2022009703A1 true WO2022009703A1 (fr) 2022-01-13

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CN (1) CN115917016A (fr)
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003073737A (ja) * 2001-08-31 2003-03-12 High Frequency Heattreat Co Ltd 高強度・高耐力コイルばねの製造方法
JP2004218016A (ja) * 2003-01-16 2004-08-05 High Frequency Heattreat Co Ltd 金属部材の加熱方法
JP2016089183A (ja) * 2014-10-29 2016-05-23 高周波熱錬株式会社 ワークの熱処理方法
JP2019157272A (ja) * 2018-03-08 2019-09-19 Ntn株式会社 ワークの焼き戻し方法、及びこの方法で得られた機械部品

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003073737A (ja) * 2001-08-31 2003-03-12 High Frequency Heattreat Co Ltd 高強度・高耐力コイルばねの製造方法
JP2004218016A (ja) * 2003-01-16 2004-08-05 High Frequency Heattreat Co Ltd 金属部材の加熱方法
JP2016089183A (ja) * 2014-10-29 2016-05-23 高周波熱錬株式会社 ワークの熱処理方法
JP2019157272A (ja) * 2018-03-08 2019-09-19 Ntn株式会社 ワークの焼き戻し方法、及びこの方法で得られた機械部品

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JPWO2022009703A1 (fr) 2022-01-13
CN115917016A (zh) 2023-04-04

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