EP3414350A1 - Procédé de traitement thermique et dispositif de traitement thermique - Google Patents

Procédé de traitement thermique et dispositif de traitement thermique

Info

Publication number
EP3414350A1
EP3414350A1 EP17703347.9A EP17703347A EP3414350A1 EP 3414350 A1 EP3414350 A1 EP 3414350A1 EP 17703347 A EP17703347 A EP 17703347A EP 3414350 A1 EP3414350 A1 EP 3414350A1
Authority
EP
European Patent Office
Prior art keywords
steel component
regions
heat treatment
temperature
treatment
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP17703347.9A
Other languages
German (de)
English (en)
Inventor
Frank WILDEN
Jörg Winkel
Andreas Reinartz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schwartz GmbH
Original Assignee
Schwartz GmbH
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 Schwartz GmbH filed Critical Schwartz GmbH
Publication of EP3414350A1 publication Critical patent/EP3414350A1/fr
Pending legal-status Critical Current

Links

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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
    • C21D1/22—Martempering
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • 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
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • 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
    • C21D2221/00—Treating localised areas of an article

Definitions

  • the invention relates to a method and a device for targeted
  • Ratio of strength to weight include in particular A and B pillars, side impact protection in doors, sills, frame parts,
  • Bumper cross member for floor and roof, front and rear
  • the raw ka rosse with a safety cage usually consists of a hardened steel sheet with about 1, 500 MPa strength. In many cases Al-Si-coated steel sheets are used. For the production of a component from hardened steel sheet the process of the so-called press hardening was developed. This steel sheets are first on
  • Warmed austenitemperatur then placed in a press tool, quickly formed and rapidly through the water-cooled tool to less than
  • first areas solid areas
  • second areas rather expandable areas
  • components with high strength are basically desirable in order to obtain components of high mechanical strength with low weight.
  • high-strength components should be able to have partially soft areas. This brings the desired, partially increased
  • the object of the invention is therefore to provide a method and a device for targeted component zone-specific heat treatment of a steel component, wherein areas of different hardness and ductility can be achieved, in which the influence on the cycle time of the entire heat treatment apparatus is minimized.
  • this object is achieved by a method having the features of independent claim 1.
  • Advantageous developments of the method will become apparent from the dependent claims 2 to 6.
  • the object is further by a Device according to claim 8 solved.
  • Advantageous embodiments of the device will become apparent from the dependent claims 9 to 16.
  • the steel component is first heated to above Austenitmaschinestemperatur AC3, so that the structure can completely convert into austenite.
  • the press hardening process is then quenched so fast that primarily forms martensitic microstructure and strengths of about 1, 500MPa be achieved.
  • the quenching takes place advantageously from the fully austenitized microstructure. This must be
  • Cooling rate to be cooled For example, at the
  • This temperature profile is common in the press hardening process especially for fully hardened components.
  • a second area or a plurality of second areas are also initially heated to above the austenitizing temperature AC3, so that the structure can completely transform into austenite.
  • a treatment time t B is cooled to a Abkühlstopptemperatur ⁇ 2 , which should be, for example, in the material 22MnB5 below 650 ° C.
  • the martensite start temperature is approximately 410 ° C for 22 nB5.
  • a slight settling in temperature ranges below the martensite start temperature is also possible.
  • it is not cooled further quickly, so that bainitic structure is formed in the majority.
  • Microstructure transformation does not happen abruptly, but requires a treatment time.
  • the conversion is exothermic.
  • in the treatment station during the treatment time t B no active heating of the second or the second areas.
  • a possible increase in temperature of the second region (s) occurs at most during this time by recalescence.
  • the second region or the second regions are additionally actively heated in this phase. This can be done, for example
  • the cooling stop temperature d 2 is selected above the martensite start temperature M s . In an alternative embodiment, the cooling stop temperature £ 2 is selected below the martensite start temperature M s .
  • the heat treatment of the first and second regions is in principle
  • Austenitization temperature downstream treatment station within a treatment time t B of a few seconds partially cooled to Abkühlstopptemperatur d 2 .
  • this treatment station it is ensured, if necessary by supplying heat, that the first region or the first regions do not fall below a temperature during the treatment period, under which none
  • the treatment station may be at least partially heated for this purpose.
  • Heat radiation can be used.
  • Heat radiation can also be additionally or exclusively a heating via laser radiation for
  • the components remain for a short time, for example a few seconds in the treatment station, to allow the structural transformation of the second regions to take place. If the residence time for sufficient structural transformation in the
  • the chambers are arranged one above the other. It is irrelevant whether the treatment stations are moved vertically to overcome the vertical offset or the feed system performs the necessary vertical movement.
  • a furnace for example, a continuous furnace or a batch furnace, such as
  • a chamber furnace for example, a chamber furnace.
  • Continuous furnaces usually have a large capacity and are particularly well suited for mass production, since they can be fed and operated without much effort.
  • the component is blown only from one side.
  • the treatment station has a device for rapid cooling of one or more second regions of the steel component.
  • the device has a nozzle for blowing the or the second regions of the steel component with a gaseous fluid
  • the blowing of the second or the second regions takes place by blowing with a gaseous fluid, wherein the gaseous fluid water, for example in fogged form, is attached.
  • the device has one or more nebulizing nozzles.
  • the second or the second regions are cooled via heat conduction, for example by contacting them with one or more punches, which has or have a significantly lower temperature than the steel component.
  • the stamp can be made of a good heat-conducting material and / or be cooled directly or indirectly. A combination of the types of cooling is conceivable.
  • Heat treatment device can be stamped steel components with one or more first and / or second areas, which may also be complex shaped, economically a corresponding temperature profile, as the different areas contour sharp very quickly to the necessary
  • Process temperatures can be brought. Between the two areas are clearly defined boundaries of the individual areas can be realized. low
  • Heat treatment apparatus possible to set almost any number of second areas, which in addition to each other within a steel component still different Festig keits- and elongation values may have.
  • the selected geometry of the sections is freely selectable. Dot or line areas are as well as e.g. large areas representable. The location of the areas is irrelevant. The second areas may be completely enclosed by first areas or located at the edge of the steel component. Even a full-surface treatment is conceivable.
  • a limitation of the number of simultaneously treated steel components is possibly given by the press hardening tool or the conveying technique of the entire heat treatment apparatus.
  • the application of the method to already preformed steel components is also possible. Due to the three-dimensionally shaped surfaces of already preformed steel components, only a higher constructive effort for the representation of the mating surfaces results.
  • Heat treatment systems can be adapted to the method according to the invention.
  • a conventional heat treatment device with only one oven behind this only the treatment station must be provided and the feeders to be adjusted.
  • Fig. 1 is a typical temperature curve in the heat treatment of a steel component having a first and a second region
  • Fig. 2 shows a thermal heat treatment apparatus according to the invention in a plan view as a schematic drawing
  • FIG. 3 shows a further plan view of a further inventive thermal heat treatment device in a plan view
  • FIG. 4 shows a further thermal heat treatment device according to the invention in a top view as a schematic drawing
  • FIG. 1 is a typical temperature curve in the heat treatment of a steel component 200 having a first region 210 and a second region 220 according to the inventive method.
  • the steel component 200 is heated in the furnace 1 10 according to the schematically drawn temperature run ⁇ 2 ⁇ , ⁇ ⁇ during the residence time in the furnace t 110 to a temperature above the AC3 temperature.
  • Treatment station 150 transferred.
  • the steel component loses heat.
  • a second region 220 of the steel component 200 is rapidly cooled, wherein the second region 220 rapidly loses heat in accordance with the indicated curve ⁇ 22 ⁇ , ⁇ 5 ⁇ .
  • the cooling ends after the expiry of the
  • Treatment time t B which is only a few seconds, depending on the thickness of the steel component 200, the desired material properties and the size of the second region 220.
  • the second area 220 now has the
  • Cooling stop temperature ⁇ 2 is reached above the martensite start temperature M s .
  • the temperature of the first region 210 of the steel component 200 may fall below the AC3 temperature, but this does not necessarily have to occur.
  • the temperature of the second region 220 of the steel component 200 may be in accordance with
  • Treatment station it is during the transfer time t 131 in a press hardening tool
  • FIG. 2 shows a heat treatment device 100 according to the invention in a 90 ° arrangement.
  • the heat treatment apparatus 100 has a loading station 101, via which steel components are fed to the furnace 110. Furthermore, the heat treatment apparatus 100 has the treatment station 150.
  • Next arranged in the main flow direction D behind the furnace 1 10 is a
  • Removal station 131 which is equipped with a positioning device (not shown).
  • the main flow direction now bends substantially 90 ° to allow a press hardening tool 160 to follow in a press (not shown) in which the steel component 200 is press hardened.
  • a press not shown
  • In the axial direction of the furnace 1 10 is a container
  • FIG. 3 shows a heat treatment apparatus 100 according to the invention in a straight arrangement.
  • the heat treatment apparatus 100 has a loading station 101, via which steel components are fed to the furnace 110. Furthermore, the heat treatment apparatus 100 has the treatment station 150.
  • Next arranged in the main flow direction D behind the furnace 1 10 is a
  • Removal station 131 which is equipped with a positioning device (not shown). Further follows in now straight main flow direction
  • Press hardening tool 160 in a press in which the steel component 200 is press-hardened.
  • a container 161 is arranged can be spent in the rejects. 4 shows a further variant of an inventive
  • Heat treatment apparatus 100 again has a loading station 101, via the steel components of the furnace 1 10th be supplied.
  • the furnace 1 10 is preferably in this embodiment as
  • the heat treatment apparatus 100 has the treatment station 150.
  • the removal device 131 may, for example, have a gripping device (not shown).
  • the removal station 131 removes the steel components 200 from the furnace 1 10, for example, by means of the gripping device.
  • the treatment station 150 is arranged on the furnace 110. This arrangement saves installation area. The main flow direction changes at this
  • Embodiment the level in which the steel member 200 is lifted from the removal station after leaving the furnace 1 10 and inserted into the treatment station 150.
  • the removal station 131 removes the steel component 200 back to the treatment station 150 and places it in a press-hardening tool 160 installed in a press.
  • the press is placed in line with the oven 110, while a bin 161 is disposed at an angle to the oven axis. The positions of the press with tool 160 and container 161 can also be reversed.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Details (AREA)
  • Tunnel Furnaces (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de traitement thermique ciblé et individuel par zones d'une pièce en acier. Une structure principalement austénitique peut être obtenue dans au moins une première zone de la pièce en acier, à partir de cette structure, une structure majoritairement martensitique peut être obtenue par trempe et, dans au moins une seconde zone de la pièce en acier, une structure majoritairement bainitique peut être obtenue. Selon l'invention, la pièce métallique peut tout d'abord être chauffée dans un four à une température supérieure à la température AC3, puis la pièce en acier peut être transférée dans un poste de traitement, ladite pièce pouvant refroidir au cours du transfert, et dans le poste de traitement, la seconde zone de la pièce en acier est refroidie pendant une durée de traitement à une température d'arrêt de refroidissement ϑ2.
EP17703347.9A 2016-02-09 2017-01-25 Procédé de traitement thermique et dispositif de traitement thermique Pending EP3414350A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016201936.8A DE102016201936A1 (de) 2016-02-09 2016-02-09 Wärmebehandlungsverfahren und Wärmebehandlungsvorrichtung
PCT/EP2017/051568 WO2017137259A1 (fr) 2016-02-09 2017-01-25 Procédé de traitement thermique et dispositif de traitement thermique

Publications (1)

Publication Number Publication Date
EP3414350A1 true EP3414350A1 (fr) 2018-12-19

Family

ID=57965908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17703347.9A Pending EP3414350A1 (fr) 2016-02-09 2017-01-25 Procédé de traitement thermique et dispositif de traitement thermique

Country Status (7)

Country Link
US (1) US11230746B2 (fr)
EP (1) EP3414350A1 (fr)
JP (1) JP6970692B2 (fr)
KR (1) KR102619541B1 (fr)
CN (1) CN108884510B (fr)
DE (1) DE102016201936A1 (fr)
WO (1) WO2017137259A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ308471B6 (cs) * 2019-08-19 2020-09-02 Západočeská Univerzita V Plzni Způsob výroby ocelových dílů z AHS oceli řízeným lokálním ochlazováním médiem, využívající tvorbu vícefázové struktury s přerušovaným chlazením na požadované teplotě
DE102020116593A1 (de) 2020-06-24 2021-12-30 AICHELIN Holding GmbH Wärmebehandlungsanlage und Verfahren zur Herstellung von Formbauteilen
JP7470241B1 (ja) 2023-10-02 2024-04-17 株式会社ノリタケカンパニーリミテド 熱処理装置および被処理物の加熱処理方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA924360B (en) * 1991-07-22 1993-03-31 Bekaert Sa Nv Heat treatment of steel wire
DE10208216C1 (de) * 2002-02-26 2003-03-27 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines metallischen Bauteils
JP4795486B2 (ja) * 2009-06-22 2011-10-19 新日本製鐵株式会社 鋼板の熱間プレス成形方法、鋼板の熱間プレス成形装置、及び鋼成形部材
US8241442B2 (en) * 2009-12-14 2012-08-14 Arcelormittal Investigacion Y Desarrollo, S.L. Method of making a hypereutectoid, head-hardened steel rail
DE102010049205B4 (de) 2010-10-13 2012-04-26 Elisabeth Braun Warmumformlinie und Verfahren zum Warmumformen von blechförmigem Material
DE102010048209C5 (de) * 2010-10-15 2016-05-25 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines warmumgeformten pressgehärteten Metallbauteils
KR101277864B1 (ko) * 2011-03-31 2013-06-21 주식회사 포스코 열간 성형용 블랭크 열처리 장치 및 열간 성형품 제조방법
EP2548975A1 (fr) * 2011-07-20 2013-01-23 LOI Thermprocess GmbH Procédé et dispositif de fabrication d'un composant métallique durci doté d'au moins deux zones ayant une ductilité différente
EP2679692A1 (fr) * 2012-06-29 2014-01-01 GEDIA Gebrüder Dingerkus GmbH Procédé de fabrication d'un composant de formage en tôle d'acier durci par une presse
JP6073154B2 (ja) * 2013-02-21 2017-02-01 株式会社神戸製鋼所 熱間プレス成形品の製造方法
DE102014201259A1 (de) 2014-01-23 2015-07-23 Schwartz Gmbh Wärmebehandlungsvorrichtung

Also Published As

Publication number Publication date
WO2017137259A1 (fr) 2017-08-17
JP2019508593A (ja) 2019-03-28
KR20180119598A (ko) 2018-11-02
JP6970692B2 (ja) 2021-11-24
CN108884510A (zh) 2018-11-23
DE102016201936A1 (de) 2017-08-10
US20210230711A1 (en) 2021-07-29
CN108884510B (zh) 2020-08-14
US11230746B2 (en) 2022-01-25
KR102619541B1 (ko) 2023-12-28

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