EP2615396A1 - Installation et procédé de préchauffage de platines lors de déformations à chaud - Google Patents

Installation et procédé de préchauffage de platines lors de déformations à chaud Download PDF

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Publication number
EP2615396A1
EP2615396A1 EP12008168.2A EP12008168A EP2615396A1 EP 2615396 A1 EP2615396 A1 EP 2615396A1 EP 12008168 A EP12008168 A EP 12008168A EP 2615396 A1 EP2615396 A1 EP 2615396A1
Authority
EP
European Patent Office
Prior art keywords
blanks
preheating
burner
plant
preheating device
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Withdrawn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
EP12008168.2A
Other languages
German (de)
English (en)
Inventor
Matthias Bors
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.)
Linde GmbH
Original Assignee
Linde 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
Priority claimed from DE102011120681A external-priority patent/DE102011120681A1/de
Application filed by Linde GmbH filed Critical Linde GmbH
Priority to EP12008168.2A priority Critical patent/EP2615396A1/fr
Publication of EP2615396A1 publication Critical patent/EP2615396A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/52—Methods of heating with flames
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/005—Furnaces in which the charge is moving up or down
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/02—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity of multiple-track type; of multiple-chamber type; Combinations of furnaces
    • F27B9/028—Multi-chamber type furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/142—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving along a vertical axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/243—Endless-strand conveyor
    • 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

Definitions

  • the invention relates to a plant for hot forming blanks, to a device for preheating the blanks for such a plant as well as to corresponding methods for hot forming and preheating.
  • metal sheets used hereby are accordingly also identified as "blanks".
  • a blank is a correspondingly cut, die cut, joined and/or preformed metal sheet.
  • the measures according to the invention cannot only be used in the case of correspondingly prepared metal sheets, but also in the case of the respective used base materials.
  • the invention thus extends to all workpieces or semifinished parts, respectively, which can be formed in a corresponding forming process, for example by means of pressing and/or deep-drawing.
  • the hot forming makes it possible to produce components comprising a high stability and a complex geometry without resilience and allows for a significant weight reduction in the case of the auto bodies manufactured therewith, e.g., as well as for an increase of safety, for example of passengers of a corresponding vehicle.
  • hot forming methods are combined forming and hardening and tempering techniques.
  • corresponding steels such as manganese-boron steels, for example, stabilities of more than 1,500 MPa can be reached therewith.
  • Press-hardening methods comprise, for example, the heating of blanks to a temperature, which lies above the complete austenitization temperature, e.g. above 850°C, and the subsequent quick cool-down of the blank in the tool.
  • the desired martensitic structure comprising the desired stability is formed through this.
  • the combination of the forming with the quenching in a tool is occasionally also identified as press- or form-hardening.
  • roller hearth furnaces are used for preheating the blanks in response to the hot forming of highest-strength materials for car bodies.
  • the heating of such furnaces typically takes place by means of steel pipes, which are heated electrically or by means of gas burners.
  • a certain "supply" of preheated components is necessary in the plant.
  • the heat treatment duration for the temperature control of the steel represents a significant parameter, which defines the clock cycle of a corresponding press.
  • roller hearth furnaces encompass a length of up to 50 meters and thus require corresponding structural conditions, including an efficient dissipation of excess heat.
  • Drum melting furnaces which are used as an alternative to roller hearth furnaces, to preheat components, also encompass corresponding disadvantages. They are also heated by means of steel pipes and are unsatisfactory in view of their degree of efficiency.
  • Press-hardened components are characterized by their high stability and stiffness. As mentioned, metal sheet thicknesses can be reduced through this and weight can thus be saved.
  • the instant invention proposes a plant for hot forming blanks, a device for preheating the blanks for such a plant as well as corresponding methods for hot forming and preheating comprising the features of the independent patent claims.
  • Preferred embodiments are the subject matter of the subclaims as well as of the following description.
  • the measures proposed according to the invention comprise to provide the preheating device with at least one fuel-oxygen burner, hydrogen-oxygen burner or acetylene burner in a plant for hot forming blanks comprising at least one preheating device and at least one main heating device, which is arranged downstream from the at least one preheating device, in particular austenitization device.
  • acetylene-burner is to comprise acetylene-oxygen burners and acetylene-air burners.
  • blades in the context of this application shall be understood in a comprehensive manner.
  • the term includes metal sheets, semifinished parts, joined and/or preformed components, which are hot formed, in particular press-hardened, in a corresponding plant.
  • pre-mixing burners are known from DE 103 54 411 A1 , for example.
  • pre-mixing fuel gas-oxygen burners are used for the so-called flame polishing of glass parts, in particular parts made of lead crystal. At least a part of the surface of the glass part is hereby heated and melted by means of the burner flame.
  • Corresponding burners are also known as so-called hydropox burners and are sold by the applicant under this brand name.
  • Pre-mixing fuel gas-oxygen burners are characterized by a particularly high heat transfer efficiency. Contrary to so-called externally-mixing burners, a gas mixture of fuel gas and oxygen is already supplied to a burner head of a pre-mixing fuel gas-oxygen burner, instead of being generated first in a corresponding burner head. Pre-mixing burners generate particularly hard flames, which are suitable to melt larger surface areas, which can also encompass depressions or other irregularities. As was brought to light according to the invention, this represents a significant advantage as compared to externally-mixing burners. Only a soft flame, which cannot permeate in particular into corners, holes or depressions of a surface, can be generated in externally-mixing burners. Even though it would also be possible to reach corresponding temperatures by heating by means of an externally-mixing burner for a longer period of time, there is a risk thereby that the blank heats up irregularly.
  • a burner comprising a plurality of nozzle openings, from which the fuel-oxygen or the hydrogen-oxygen mixture or the acetylene-air or acetylene-oxygen mixture escapes.
  • the burner has between 100 and 1000 nozzle openings. A highly continuous heating of the region, which is to be heated, is attained in this manner.
  • the nozzle openings are distributed to an area of the burner head, which has a width of between 50 and 400 mm.
  • the area of the burner or of the burner head, respectively, which is covered by the nozzle openings, is preferably chosen as a function of the size of the regions, which are to be heated.
  • the burner has a plurality of nozzle openings, which are arranged close to one another, comprising a relatively small diameter.
  • a highly continuous heating of the blanks or of the regions of the blanks, which are to be heated, respectively, can be attained in this manner.
  • the diameter of the nozzle openings is less than 2 mm or less than 1.5 mm.
  • nozzle openings comprising a diameter of between 0.5 mm and 1.3 mm are chosen.
  • the nozzle openings are preferably arranged tightly, so as to ensure a highly continuous heating.
  • the distance of two adjacent nozzle openings lies between 1 mm and 4 mm.
  • the heating device comprising the burner or the burners has an output of between 50 and 500 kW.
  • the output of one burner is between 30 and 150 kW.
  • one or a plurality of burners is installed. The output of the burner or of the burners is distributed to a plurality of nozzle openings, so that the burner output for each nozzle opening remains relatively low, and a local heating of the blank, which is too high, is thus avoided.
  • a corresponding plant advantageously further encompasses at least one loading device for loading the plant with the blanks and/or at least one transfer device for transferring the blanks into at least one pressing device of the plant.
  • the at least one main heating device comprises at least one paternoster furnace.
  • Vertical paternoster furnaces for example, which encompass an improved energy efficiency and which in particular provide the advantage of being able to replace common roller hearth furnaces, which, as mentioned, are of a large design and which thus require corresponding structural conditions, can be used as paternoster furnaces, which are known on principle.
  • paternoster furnaces can be heated electrically or with fuel and can be operated in corresponding temperature ranges, so that an efficient and reliable heating is ensured.
  • the main heating device, in particular the austenitization device, of a corresponding plant is equipped for heating the blanks to a temperature of between 750-1,050°C, in particular of between 800-1,000°C, for example of between 850-950°C.
  • a corresponding austenitization device will heat at least areas of a corresponding blank to a temperature, which lies above an austenitization temperature of the corresponding materials.
  • the temperature, which is used thus depends on the material, which is used, and can simply be derived by the person of skill in the art from corresponding key figures.
  • the complete austenitization temperature of manganese-boron steels is 850°C, for example. In the event that a workpiece, which was already preheated, is heated further in a corresponding austenitization device, an austenitization can be carried out quickly and in an energy-efficient manner.
  • a preheating device for an above-explained plant for hot forming blanks, encompasses at least one pre-mixing hydrogen-oxygen burner, which, as explained above, provides significant advantages as compared to other burner types.
  • a preheating device for preheating blanks wherein at least one burner flame of the corresponding burner can be directed to the regions, which are provided for the preheating.
  • a corresponding blank can thus be preheated quickly to a temperature, which lies just below the austenitization temperature.
  • the austenitization temperature can then be exceeded quickly and with little expenditure of energy.
  • a corresponding preheating device is equipped to preheat the blanks to a temperature of between 450-850°C, in particular of between 600-800°C, for example of between 650-750°C.
  • the preheating device serves to preheat the blanks to a temperature of between 450°C and 550°C.
  • Corresponding temperatures are temperatures, which lie below a, in particular complete, austenitization temperature of a corresponding material.
  • the complete austenitization temperature is 850°C.
  • a preheating device as explained above is provided with an austenitization device in the form of a structural unit.
  • This provides for compact plants, which have a small design and which can be insulated thermally in a simple manner.
  • the invention is used for the manufacture of auto body components of motor vehicles, for example the B-pillar of a motor vehicle cell, in a particularly advantageous manner.
  • Such auto body components in view of hardness, material stability and expansion characteristics.
  • the blanks used for this purpose are not to be too brittle, because tears can otherwise form in the material in response to the forming processes and welding processes, which are necessary for the manufacture of the auto body components.
  • the burner or the burners used for the preheating according to the invention produce water or water vapor-containing exhaust gases.
  • these water-containing exhaust gases reach the downstream main heating device, a considerable dew point occurs in the main heating device, which can lead to an increased portion of diffusible hydrogen in the metallic structure of the blanks.
  • the blanks thus become more brittle and the above-described material tears ("delayed fracture") can occur.
  • the housing encompasses one or a plurality of vents, which are connected to an extraction device. The exhaust gas does not only flow out of the vents, but is removed actively.
  • the vents are not identical with the inlet or outlet opening for feeding or discharging the blank into and out of the housing.
  • the vents are arranged such that a flow, which keeps the exhaust gas away from the outlet opening, is embodied in the housing, so as to prevent that exhaust gas reaches via the outlet opening into the following downstream main heating device.
  • the outlet opening can be provided with a gas veil, in particular a nitrogen veil.
  • a gas, for example nitrogen is blown into the housing in the area of the outlet opening, so as to form a gas barrier for escaping exhaust gas.
  • a method for hot forming blanks advantageously comprises the loading of the blanks into a plant as explained above, to preheat them to a preheating temperature in a preheating device as explained above, to heat or to austenitize, respectively, the blanks in a main heating device, in particular an austenitization device, as explained above, and to form them in a pressing device by means of pressing.
  • a corresponding pressing method can in particular be a so-called pres-hardening method.
  • Such a method advantageously comprises a method for preheating blanks, in the case of which the blanks are heated in a preheating device as explained above to a temperature, which lies below, in particular between 5° and 50°, in particular between 10° and 20°, below the austenitization temperature of the blanks.
  • a temperature which lies below, in particular between 5° and 50°, in particular between 10° and 20°, below the austenitization temperature of the blanks.
  • said temperature can be reached or exceeded, respectively, very quickly and in an energy-efficient manner in an austenitization device, so as to austenitize corresponding workpieces therein.
  • Figure 1 shows a plant for hot forming blanks according to an embodiment of the invention.
  • the plant as a whole is identified with 10. It has a loading device 3, in which corresponding blanks, for example punched metal sheet pieces, can be loaded into a corresponding plant in an arrow direction. They subsequently pass through a preheating device 2, which encompasses a corresponding burner 1, which is symbolized herein as a three-flamed burner 1.
  • the burner 1 can encompass any number of burner flames.
  • the burner 1 can also be embodied so as to be mobile and can impact different areas of a blank P consecutively. For this purpose, provision can be made for corresponding movement devices, which can also be controlled fully-automatically, for example, by using a corresponding control.
  • the blanks P pass through the austenitization device 2 in arrow direction and are heated there to a temperature, which lies below an austenitization temperature of the corresponding material.
  • an austenitization device 4 which is embodied herein as a schematically illustrated paternoster furnace.
  • the blanks P are introduced into a lower area of the austenitization device 4 in arrow direction, are lifted upwards and are heated continuously during the lifting. With reference to the temperatures used in the austenitization device 4, reference is made to the above information.
  • the blanks P leave the latter again in arrow direction.
  • the blanks P subsequently reach into a transfer device 5 and are transferred there to a pressing tool, for example, which, however, is not illustrated in Figure 1 .
  • FIG. 2 shows burner heads for being used according to the state of the art and according to an embodiment of the invention in a schematic illustration.
  • a so-called externally-mixing burner head is identified with 21, a pre-mixing burner, which can be used according to the invention, is identified with 22.
  • the externally-mixing burner head 21 has a line 212, which is located on the outside, for providing oxygen, and a line 211, which is located on the inside, for providing fuel gas, in particular hydrogen.
  • a mixing of the gases provided via both channels first takes place in the area of burner nozzles 213.
  • corresponding so-called externally-mixing burners generate relatively soft flames, which are only conditionally suitable for the purposes according to the invention.
  • a much harder burner flame which ensures an improved energy transfer, can be generated with a pre-mixing hydrogen-oxygen burner, which has a common channel 221, via which a hydrogen-oxygen mixture is supplied to a burner head 22.
  • the corresponding gas mixture already flows out of the nozzles 223 as mixture and is ignited there.
  • FIG. 3 shows a flow chart of a method of a particularly preferred embodiment of the invention in a schematic illustration.
  • a first method step 101 corresponding blanks P are punched out of a metal sheet.
  • a method step 102 they are loaded into a hot forming plant according to the invention, for example by means of a loading device. This can take place continuously.
  • the blanks P are preheated in the plant, for the purpose of which the afore-explained means can be used.
  • an austenitization takes place, as explained above. After the austenitization, the blanks P are transferred into a pressing tool by means of a transfer device in step 105 and are pressed there in a step 106, for example press-hardened.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat Treatment Of Articles (AREA)
EP12008168.2A 2011-12-08 2012-12-06 Installation et procédé de préchauffage de platines lors de déformations à chaud Withdrawn EP2615396A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12008168.2A EP2615396A1 (fr) 2011-12-08 2012-12-06 Installation et procédé de préchauffage de platines lors de déformations à chaud

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102011120681A DE102011120681A1 (de) 2011-12-08 2011-12-08 Anlage und Verfahren zum Vorwärmen von Platinen beim Warmumformen
EP12002748 2012-04-19
EP12008168.2A EP2615396A1 (fr) 2011-12-08 2012-12-06 Installation et procédé de préchauffage de platines lors de déformations à chaud

Publications (1)

Publication Number Publication Date
EP2615396A1 true EP2615396A1 (fr) 2013-07-17

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EP12008168.2A Withdrawn EP2615396A1 (fr) 2011-12-08 2012-12-06 Installation et procédé de préchauffage de platines lors de déformations à chaud

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018115298A1 (fr) * 2016-12-22 2018-06-28 Autotech Engineering A.I.E. Procédé de chauffage d'une pièce brute et système de chauffage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11325421A (ja) * 1998-05-08 1999-11-26 Mitsubishi Heavy Ind Ltd 予混合バーナ
DE10354411A1 (de) 2003-11-21 2005-06-23 Linde Ag Brennersteuerung zum Feuerpolieren von Glas
US20100086002A1 (en) * 2008-10-02 2010-04-08 Ms Autotech Co., Ltd. Heating Furnace System for Hot Stamping
DE102009019496A1 (de) * 2009-05-04 2010-11-18 Braun, Elisabeth Vorrichtung und Verfahren zur Erwärmung warm umzuformender Werkstücke
WO2011126427A1 (fr) * 2010-04-06 2011-10-13 Linde Ag Procédé et dispositif de traitement de produits métalliques continus ou discrets

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11325421A (ja) * 1998-05-08 1999-11-26 Mitsubishi Heavy Ind Ltd 予混合バーナ
DE10354411A1 (de) 2003-11-21 2005-06-23 Linde Ag Brennersteuerung zum Feuerpolieren von Glas
US20100086002A1 (en) * 2008-10-02 2010-04-08 Ms Autotech Co., Ltd. Heating Furnace System for Hot Stamping
DE102009019496A1 (de) * 2009-05-04 2010-11-18 Braun, Elisabeth Vorrichtung und Verfahren zur Erwärmung warm umzuformender Werkstücke
WO2011126427A1 (fr) * 2010-04-06 2011-10-13 Linde Ag Procédé et dispositif de traitement de produits métalliques continus ou discrets

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018115298A1 (fr) * 2016-12-22 2018-06-28 Autotech Engineering A.I.E. Procédé de chauffage d'une pièce brute et système de chauffage
CN110036121A (zh) * 2016-12-22 2019-07-19 自动工程有限公司 用于加热坯料的方法以及加热系统
US11740023B2 (en) 2016-12-22 2023-08-29 Autotech Engineering, S.L. Method for heating a blank and heating system

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