EP2456896A1 - Procédé et dispositif de formage à chaud éconergétique - Google Patents

Procédé et dispositif de formage à chaud éconergétique

Info

Publication number
EP2456896A1
EP2456896A1 EP10737825A EP10737825A EP2456896A1 EP 2456896 A1 EP2456896 A1 EP 2456896A1 EP 10737825 A EP10737825 A EP 10737825A EP 10737825 A EP10737825 A EP 10737825A EP 2456896 A1 EP2456896 A1 EP 2456896A1
Authority
EP
European Patent Office
Prior art keywords
furnace
steel
steel part
temperature
hot
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.)
Withdrawn
Application number
EP10737825A
Other languages
German (de)
English (en)
Inventor
Sascha Sikora
Siegfried Lösch
Janko Banik
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.)
ThyssenKrupp Steel Europe AG
GMF Umformtechnik GmbH
Original Assignee
ThyssenKrupp Steel Europe AG
GMF Umformtechnik 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 ThyssenKrupp Steel Europe AG, GMF Umformtechnik GmbH filed Critical ThyssenKrupp Steel Europe AG
Publication of EP2456896A1 publication Critical patent/EP2456896A1/fr
Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/005—Multi-stage presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • 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
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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 for hot working steel parts, in particular blanks or semi-finished steel, in which the steel parts are heated in an oven for at least partial austenitization to a temperature above the Acl temperature and hot-formed in a forming tool.
  • the invention relates to an apparatus for carrying out the method with a furnace for heating the steel parts above the ACl temperature to form an at least partially austenitic structure, a forming tool for hot working of the steel parts and means for transporting the steel parts from the furnace to
  • the semi-finished products can be any suitable material.
  • Hot forming are provided.
  • the semi-finished products can be any suitable material.
  • the steel parts intended for hot forming must first be placed on a
  • Forming then takes place a so-called “press hardening", in which due to the rapid cooling the
  • hot-forming steel parts are preferably coated with an AlSi coating.
  • the press hardening can be followed by another step, in which the formed steel parts of another
  • Heat treatment for example, be subjected to tempering to certain areas or in total the
  • Patent DE 10 2005 033 042 B3 is known, the
  • Residual heat amounts for a significant reduction of
  • the above-indicated object is achieved according to a first teaching of the present invention in that the waste heat of the furnace for more
  • the waste heat of the furnace now for further heat treatment steps on the steel part before and / or after the at least partial
  • Austenitization of the steel part can be used, so that significant energy can be saved.
  • Heating austenitization using the waste heat of the furnace can be reduced because the components in the furnace for at least partial austenitization due to the higher
  • Amounts of heat can be provided by the waste heat of the furnace.
  • the energy efficiency of the method according to the invention can thereby be further increased. According to a first embodiment of the invention
  • Process becomes a continuous furnace, preferably one
  • Roller hearth furnace used for at least partial austenitization of the steel part.
  • Roller hearth furnace offers an easy way of at least partially austenitizing the steel part in one
  • Heat treatments can be used are increased by the fact that the oven for at least partial
  • Austenitizing the steel part at least partially with gas is heated and the waste heat of the combustion gases from the furnace is used.
  • jet kiln can heat the component to the desired temperature above the ACl temperature point or even above the AC3 temperature point in a very short time, so that the cycle times for the at least partial Austemtmaschine of the steel part are relatively short.
  • the waste heat of Verbrenn ⁇ ngsgase can be used in a simple manner in which, for example via heat exchangers, the amount of energy is withdrawn from the gas or the exhaust gas directly for more
  • Austemtmaschine the steel part needed to be reduced while saving energy. This is on the one hand because the already heated steel part requires less energy to be heated to the desired temperature. On the other hand will
  • a metal-coated, preferably an AlSi-coated steel part achieved a relatively high iron content in the AlSi coating, which leads to a roughening of the surface layer, so that the radiant heat in the oven for at least partial Austemtmaschine the steel part clearly can be used more efficiently.
  • the reflection properties of the pre-alloyed metal-coated, preferably AlSi-coated steel part are significantly improved. A further increase in the energy efficiency of the
  • Erflndungsgepurposeen method can be achieved in that the forming tool for hot forming at least partially with the heat of the furnace for at least partially
  • a different Gefuge in the steel part can be partially adjusted so that different component properties can be provided in the formed steel part.
  • another heat treatment takes place, which according to another
  • Embodiment of Erflndungsgeschreiben method advantageous using the Abwarme of the furnace for at least
  • a typical post-forming heat treatment is tempering, such as partial tempering of the formed, tempered steel part, around the
  • the heat treatment steps of the steel part before and / or after the at least partial austenitization of the Stanlteils be performed by forced convection.
  • a forced convection of the heat transfer is significantly increased because the heated steel parts or parts of the tool, for example, with a hot gas jet energized so that is an intense contact between hot
  • the steel parts are heated in the preheating furnace to a temperature of 200 0 C to ACl temperature, preferably at 250 0 C to 700 0 C.
  • Uncoated steel parts are heated in the preheating furnace to a temperature of 200 0 C to ACl temperature, preferably at 250 0 C to 700 0 C.
  • coated components can be pre-alloyed, for example with an AlSi coating in this temperature range with a short residence time, in particular to achieve a shortened heating time in the oven for at least partial Austemtmaschine the steel part.
  • the above-described object for a device is achieved by providing means for using the waste heat of the furnace before and / or after at least partially austemifying the steel part.
  • Means for using the waste heat of the furnace for at least partially Austemtmaschine the steel parts are diverse and can be designed differently. Typically, they include piping and blower devices that are useful for the use and transportation of such hot gases. In addition, heat exchangers may be provided which pass on the heat of the combustion exhaust gases of the furnace to another réelleleitmedium. As a result, the energy efficiency of the erfmdungsgeArchitecten method for hot forming of steel parts by the use of these means significantly improved and also reduces the cycle times for the completion of hot-formed steel parts.
  • Heating a preheating furnace, the forming tool and / or a tempering furnace can be used. This will be the
  • the device according to the invention is a continuous furnace, preferably a
  • Roller hearth furnace intended for at least partial austenitization of the steel parts.
  • a continuous furnace preferably a roller hearth furnace, a simple integration of the heating of the steel part to above the ACl temperature in one
  • Integrate process chain for the production of hot-formed steel parts are as means for heating the preheating furnace, the Ümformwerkmaschines and / or the tempering furnace gas lines and / or blower for supplying the combustion gases of the furnace for at least partial austenitization of
  • heat exchangers can also be used when the combustion gases are not used immediately.
  • erfmdungsgeanden method comprises a furnace 1 for at least partially Austemtmaschine a steel part 2.
  • the steel part 2 in this case a planar board of a
  • hardenable steel is heated in the exemplary embodiment of FIG. 1 to a temperature of at least 850 0 C and held for about 2 to 15 minutes at this temperature in the furnace 1, which is designed as a roller hearth furnace.
  • the board is made of 22MnB5 steel.
  • Combustion gases of the roller hearth furnace 1 are about Media feeds 5, 6, 7 removed for further heat treatments from the roller hearth furnace 1.
  • the forming tool 9 or the tempering furnace 10 are also fans 5a, 6a and 7a
  • the media supply 5 directs the hot combustion gases to a preheating furnace 8, in which the board 2 to a temperature of more than 200 0 C to ACl temperature,
  • the board 2 is preferably heated to a temperature between 250 0 C and 700 0 C.
  • the residence time in the preheating oven is about 3 to 20 minutes, but preferably 5 to 10 minutes.
  • rollers 4 are also shown.
  • the board 2 is heated to a relatively high temperature, as already stated. If the panel 2 is carried out with an AlSi coating, it can be alloyed in the preheating furnace at appropriate temperatures which can be for example between 500 and 700 0 C, and thus receives a roughened surface structure that the heating of the board 2, for example, in the roller hearth furnace 1 facilitated.
  • the preheating of the board 2 in the preheating 8 occurs a significant energy savings, since the high temperatures, which are also required for pre-alloying the coated board, can be provided in a simple manner. Following the austenitization in the
  • Roller hearth furnace 1 the board 2 using a Not shown handling system with the highest possible
  • boards 2 provided with an AlSi coating can be hot-formed, preferably press-hardened.
  • the Thereforezuzenung 7 serves to temper the
  • Steel part 11 martensitic Gefuge is generated by a rapid cooling.
  • the formed steel part 12 may optionally be subjected to another heat treatment in a tempering furnace 10. Even with the tempering furnace 10, the
  • Energy of the exhaust gases of the roller hearth furnace 1 are used to perform the annealing process, for example in partial sections of the coated steel part 12.
  • the transport zwiscnen the individual stations, in particular the preheating furnace 8, the roller hearth furnace 1, the forming tool 9 and the tempering furnace 10 can by not shown
  • Em roller conveyor 4 as it is shown in the present exemplary embodiment, can alternatively be replaced by handling systems.
  • FIG. 1 As a result, with the erfmdungsgeHelpen method or with the device according to the invention, as shown in FIG. 1

Landscapes

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

Abstract

L'invention concerne un procédé de formage à chaud de pièces en acier, en particulier de platines ou de semi-produits en acier, selon lequel les pièces en acier sont chauffées dans un four pour austénitisation, au moins partielle, à une température supérieure à la température Ac1, et formées à chaud dans un outil de formage. L'invention a pour but de créer d'un procédé de formage à chaud de pièces en acier, permettant une mise en oeuvre à haut rendement énergétique, du formage à chaud et, en même temps, réduisant les temps de cycle pour la production d'un composant formé à chaud. A cet effet, l'invention est caractérisée en ce que la chaleur perdue du four est utilisée pour d'autres étapes de traitement thermique de la pièce en acier avant et/ou après l'austénitisation, au moins partielle, de la pièce en acier.
EP10737825A 2009-07-24 2010-07-13 Procédé et dispositif de formage à chaud éconergétique Withdrawn EP2456896A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009026251A DE102009026251A1 (de) 2009-07-24 2009-07-24 Verfahren und Vorrichtung zum energieeffizienten Warmumformen
PCT/EP2010/060052 WO2011009769A1 (fr) 2009-07-24 2010-07-13 Procédé et dispositif de formage à chaud éconergétique

Publications (1)

Publication Number Publication Date
EP2456896A1 true EP2456896A1 (fr) 2012-05-30

Family

ID=42731946

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10737825A Withdrawn EP2456896A1 (fr) 2009-07-24 2010-07-13 Procédé et dispositif de formage à chaud éconergétique

Country Status (5)

Country Link
US (1) US20120152410A1 (fr)
EP (1) EP2456896A1 (fr)
CN (1) CN102482725A (fr)
DE (1) DE102009026251A1 (fr)
WO (1) WO2011009769A1 (fr)

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PL3481626T3 (pl) * 2016-07-08 2023-10-09 Quintus Technologies Ab Sposób i system do formowania ciśnieniowego przedmiotu obrabianego
DE102016219579A1 (de) 2016-10-10 2018-04-12 Volkswagen Aktiengesellschaft Verfahren zur Wärmebehandlung und Einrichtung zur Wärmebehandlung
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Also Published As

Publication number Publication date
WO2011009769A9 (fr) 2011-06-16
CN102482725A (zh) 2012-05-30
US20120152410A1 (en) 2012-06-21
DE102009026251A1 (de) 2011-02-03
WO2011009769A1 (fr) 2011-01-27

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