EP2924130A1 - Dispositif de chauffage destiné à chauffer une platine de tôle - Google Patents

Dispositif de chauffage destiné à chauffer une platine de tôle Download PDF

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Publication number
EP2924130A1
EP2924130A1 EP15157427.4A EP15157427A EP2924130A1 EP 2924130 A1 EP2924130 A1 EP 2924130A1 EP 15157427 A EP15157427 A EP 15157427A EP 2924130 A1 EP2924130 A1 EP 2924130A1
Authority
EP
European Patent Office
Prior art keywords
sheet metal
metal blank
compensating element
heating device
cross
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Withdrawn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
EP15157427.4A
Other languages
German (de)
English (en)
Inventor
Dr. Jan Lackmann
Stefan Konrad
Hans-Gerd Lambers
Huschen Ulrich
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.)
Benteler Automobiltechnik GmbH
Original Assignee
Benteler Automobiltechnik 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 Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Publication of EP2924130A1 publication Critical patent/EP2924130A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0004—Devices wherein the heating current flows through the material to be heated
    • 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
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping 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
    • 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
    • C21D1/34—Methods of heating
    • C21D1/40—Direct resistance 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders
    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • B21D35/006—Blanks having varying thickness, e.g. tailored blanks
    • 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 present invention relates to a heating device for conductive heating of a sheet metal blank according to the features in the preamble of claim 1.
  • motor vehicle components in particular motor vehicle exterior components or else also motor vehicle structural components from sheet metal blanks.
  • a sheet metal blank is first heated at least partially above austenitizing temperature and then shaped in this state and rapidly cooled in a Hardened press tool or a downstream cooling device. This process is also known as press hardening.
  • Heating to over Austenitmaschinestemperatur means as it were a warming to more than 900 ° C, so that an increased energy input is needed. This means high production costs and a corresponding environmental impact due to the energy consumed.
  • the prior art conductive conduction has been established in which heat is generated within the board by virtue of a current flow conducted through the board to be heated due to the electrical resistance.
  • a method is for example from the DE 102 12 819 B4 known.
  • electrodes are placed on opposite ends of a sheet metal blank, so that the sheet metal blank is part of an electrical circuit.
  • a current thus a heat input is generated in the sheet metal blank.
  • it is also provided according to current-conducting solid state applied to the board, so that a stray flux of the electric current is generated.
  • the electric current is divided in the region of the electrically conductive solids in part on this and thus does not flow with full current density through the sheet metal plate itself, but also with parts through the solids.
  • Object of the present invention is to show starting from the prior art, a heating possibility for a sheet metal blank, with a rational targeted, in particular homogeneous heating of the sheet metal blank is made possible by means of conductive heating.
  • the heating device according to the invention for the conductive heating of a metal sheet with varying cross-sectional area, wherein the sheet metal plate is a direct component of a circuit is characterized according to the invention by an electrically conductive compensating body or compensating element is provided, is placed on a surface of the sheet metal blank, wherein the cross-sectional area of the sheet metal blank added to the cross-sectional area of the compensating body results in a Stromleitquerroughs simulation.
  • a compensating element made of an electrically conductive material is thus exposed, at least on a surface preferably completely on the surface, so that divergent cross sections of the sheet metal plate with regard to the associated different heating due to a concentration of the current density are selectively influenced.
  • the mutually different width can be influenced by a different absolute width in the respective cross section of the sheet metal blank but also by recesses, openings or openings within the sheet metal blank.
  • the compensating element itself provides here by a larger cross-sectional area of the compensation element itself before a compensation of the smaller cross-sectional area of the sheet metal blank, so that a targeted adjustment of the heating of the sheet metal blank in this area is achieved by specific choice of the total resulting current flow cross-sectional area.
  • the current flow cross-sectional area results in each case from the addition of the cross-sectional area of the sheet metal blank as well as the cross-sectional area of the compensating element. This results in an effective or effective Stromleitqueritess Diagram.
  • the compensating element is thus electrically conductive on the sheet metal blank, which is formed in particular of a steel material to. Conductive heating in the context of this invention is a Resistance heating in the sheet metal plate to understand due to an electrical current flow.
  • the Stromleitqueritess simulation is constant, so that there is a homogeneous heating over the entire sheet metal blank. Scatter losses or slight deviations due to a higher cross-sectional area of the compensating element compared to a smaller cross-sectional area of the sheet metal blank are negligible within the scope of the invention.
  • Another essential feature of the invention is that when contacting the compensating element with corresponding electrodes, in particular the contact areas or receiving areas for the electrodes on the compensating element are formed with a high mass or relatively thick. This results in a low current density density in this area, so that it leads to the compensation element only to a slight warming. Consequently, in particular even at high utilization, heating with a corresponding compensating element according to the invention requires no separate cooling in the region of the connection of the electrodes.
  • the heating device according to the invention is in particular in a production line for the production of hot-formed and press-hardened or tempered sheet metal components, preferably sheet steel components integrated, with heating within a very short time, especially in the production cycle is feasible.
  • the heating device is preferably attached to an industrial robot, so that it can be used as a manipulator or transport device.
  • a heating device is used to receive the sheet metal blank from a stack or tape and to transport to a further processing device, in particular a hot forming press with simultaneous heating during transport.
  • the compensation element has a relation to the sheet metal plate generally larger mass, which also heats up.
  • the compensation element then gives off at least some of the heat energy contained by heat conduction to the sheet metal blank, whereby a reduction of the production costs for purely conductive resistance heating takes place.
  • the compensation element lies on the entire surface of the surface of the sheet metal blank.
  • the contact surface of the compensation element to the sheet metal plate is concave. So it has a curvature inwards to the compensation element out. The sheet metal plate is thus attracted to the contact surface.
  • a corresponding pressing force can furthermore be applied particularly preferably via the compensating element, so that a gap is reduced to zero in the contact surface resulting between the compensating element and the board, and thus an almost complete contact is achieved.
  • the compensation element is part of a pressing tool or a tempering station, so that the board is inserted into the tempering and then a corresponding contact pressure is applied.
  • the full-surface system continues to be reinforced, it is provided in the invention that in the compensation element vacuum channels are present, so that when applied to the vacuum channels with a negative pressure, a suction effect for tightening the sheet metal plate is used to the compensation element.
  • the compensation element has mechanical grippers, for example as pliers, which comprise the edge side of the sheet metal blank.
  • ejectors or pressure rams are furthermore preferably provided which repel the sheet metal blank against the holding force at the storage location.
  • the metal sheet is contacted at each opposite ends with an electrode
  • either only the sheet metal blank is contacted or alternatively contacted the sheet metal blank and the compensating element at least partially by the opposite electrodes are.
  • the compensation element is provided with electrodes, so that the electrical current flow is passed from the compensation elements to the board.
  • the compensation element is made of scale-resistant steel material or has a scale-resistant coating, so that a scaling takes place during operation of the temperature control.
  • the contact surface of the temperature control in electrically conductive contact with the sheet metal blank.
  • the compensation element can also be formed at least partially from carbon or semiconductor materials.
  • the cross-sectional area of the compensating element can be adjusted by targeted variation of the height or the width of the compensating element.
  • two compensation elements are provided, so that the upper side but also the underside of a sheet metal blank thus the two main surfaces of the sheet metal blank are each contacted by a compensation element.
  • the cross-sectional areas, in this case two compensating elements, added with the cross-sectional area of the sheet metal blank then in turn form the Stromleitquer songs simulation, which is very particularly preferably constant in the context of the invention to achieve a homogeneous heating of the sheet metal blank.
  • a load distribution plate can be arranged on the side of the compensating element opposite the metal sheet, which on the one hand stabilizes the compensating element and, on the other hand, selectively influences, in particular homogenizes, the forces applied to the sheet metal plate during the recording.
  • a load distribution plate in turn with the corresponding compensation element and optionally optionally arranged therebetween insulating layer in a tempering or a press are arranged so that a uniform contact or contact pressure prevails and thus an electrical conductivity is established.
  • the respectively opposite cross-sectional area of the two compensating elements can be different from one another.
  • FIG. 1 shows a plan view and a longitudinal sectional view of a sheet metal blank to be heated 1.
  • the sheet metal blank 1 has for this purpose two surfaces 2, 3, a surface 2 at the top and a surface 3 at the bottom.
  • the sheet metal blank 1 has a homogeneous wall thickness 4 over its entire length 5.
  • the sheet metal blank 1 has a mutually different width 6, so that the width 6.1 on one side is significantly smaller than the width 6.2 on the opposite side, again in the region of a recess 7 of which a different width 6.3 composed of the widths 6.31 and 6.32 results.
  • Each wall thickness 4 multiplied by the respective width 6 then gives a cross-sectional area of the board to the respective length section.
  • the cross-sectional area varies here due to the mutually different width 6 and / or the recess. 7
  • a compensation element 8 is provided, which according to the plan view FIG. 2a essentially corresponds to the outer dimensions of the sheet metal blank 1. This also has a length 9 which corresponds substantially to the length 5 of the sheet metal blank 1.
  • Stromeinleit vom 10 are provided so that to a conductive Heating a current in the compensating element 8 and in electrical system contact with the sheet metal blank 1 in the sheet metal blank 1 is introduced.
  • the compensation element 8 also has a recess 11, corresponding to the recess 7 in the region of the sheet metal blank 1.
  • FIG. 2b An essential part of the invention is now over FIG. 2b clearly visible. Accordingly, the wall thickness 4 or depth 14 of the compensating element 8 at mutually different locations 14.1, 14.2, 14.3 chosen such that the mutually different widths 6 of in FIG. 1a Compensated board can be compensated.
  • the mutually different depths 14 of the compensating element 8 combined with the mutually different widths 15 of the compensating element 8, shown in FIG. 2a , thus, each results in a different cross-sectional area of the compensating element 8 at a longitudinal section.
  • electrodes 32 can be connected for coupling to a power source.
  • a respective constant Stromleitquerroughs Solution 17 (indicated by arrows), which is composed of the respective cross-sectional area of the sheet metal blank 1 and the cross-sectional area of the compensating element 8 which in turn is composed of width and wall thickness or depth. Also shown is a vacuum applied to the vacuum passages 12 for attracting the sheet metal blank 1 to the compensating element 8 in order to realize an electrical, in particular full-surface contact.
  • FIGS. 4a and c a compensation element 8 is shown that in edge regions 19 according to the cross-sectional view AA in Figure 4c has an increased depth 14, just to reach in the edge region 19 of the board to be heated on the example of a B-pillar shown a softer area by a lower current flow in the board and associated with a lower heating. Also shown is a boundary 20 at which a targeted delta 21 is set in the cross-sectional area of the compensating element 8 in accordance with FIG FIG. 5a around Limit 20 on a illustrated sheet metal blank 1 for producing a B-pillar, in particular set different strength ranges from each other.
  • FIGS. 6a and b are a variant of the invention of the heating device 23, comprising the compensation element 8 and a rear load distribution plate 24 under inclusion of an insulating plate 27, wherein the compensation element 8 is arranged on the load distribution plate 24 on a gripper arm 25 of an industrial robot, not shown.
  • the sheet metal blank 1 in connection with the vacuum channels 12, the sheet metal blank 1 is sucked and further fixed in position on the outside arranged pliers 26, so that consequently a system contact between the surface 2 of the sheet metal blank 1 and a contact surface 13 of the compensating elements 8 is formed.
  • an insulating plate 27 is arranged between load distribution plate 24 and compensating element 8, which prevents heat dissipation of compensating element 8 to the load distribution plate 24.
  • a current input surface 10 which are coupled to electrodes 32 for application to a current.
  • FIG. 7 Furthermore shown in FIG. 7 is a variant with two compensation elements 8, which are mirror-symmetrical and contact the sheet metal blank 1 from both surfaces 2, 3 forth.
  • the compensated by the compensating element 8 cross-sectional area of the sheet metal blank 1 is thus illustrated on the image plane top and bottom of each arranged compensating element 8 compensated.
  • the compensation elements 8 are each acted upon with electricity, alternatively, however, not shown in detail in each case only one compensation element 8 are energized.
  • FIG. 8 shows an alternative embodiment variant with an underlying insulating plate 27.
  • the compensation element 8 the sheet metal plate 1 press in the direction of the insulating plate 27 and thus in turn improve the contact surface contact.
  • a load distribution plate 24 is disposed behind the compensation element 8 but also behind the insulating plate 27.
  • FIG. 9 shows a further embodiment of a heating device 23 according to the invention, in which case again two compensating elements 8 are arranged, wherein the compensating elements 8 have mutually different cross-sectional areas.
  • this can be used as shown here for tempering a sheet metal blank 1 with a patch 28 or even for a sheet metal blank 1, not shown in detail with different wall thicknesses 4.
  • a corresponding patch 28 is fixed to the sheet metal blank 1, for example by gluing or but a welding process or a bond or a corresponding enamel.
  • FIG. 10 Shown is a metal sheet 1 with longitudinally mutually different wall thicknesses 4, which is enclosed in this embodiment by an upper compensating element 8 and a lower compensating element 8.
  • the upper compensation element in this case has vacuum channels 12, so that for example with the upper compensation element 8, the sheet metal blank 1 can be accommodated and then stored in the lower compensation element 8, in which case the temperature takes place accordingly.
  • the sheet metal plate 1 itself has 5 different wall thicknesses 4 over their length. All the aforementioned embodiments and in particular those in the FIG. 10 illustrated variant can be incorporated into a temperature control, a press tool or a fixing tool so.
  • the upper half shown on the image plane and here in particular the upper compensation element 8 is raised for inserting a board and then lowered to be placed with a corresponding press pressure in particular homogeneously distributed press pressure on the board.
  • the load distribution plate 24 may be part of an upper tool and / or lower tool of Be tempering station or the press tool or fixing tool, wherein a gripping arm 25 according to FIGS. 6 to 10 in these cases is omitted.
  • FIG. 11 A possible field of application of a heating device 23 according to the invention is shown in FIG. 11 ,
  • an industrial robot 29 is shown, which has received by means of the compensating element 8 according to the invention a sheet metal blank 1, wherein also shown corresponding pliers 26 which fix the sheet metal blank 1 in the received state in addition to the vacuum channels 12.
  • the vacuum channels 12 or pliers 26 can also be used alone.
  • the thus-heated sheet metal blank 1 is then transferred to a thermoforming apparatus 30, in which it can be thermoformed and optionally also press-hardened or, alternatively, transferred to a following press hardening apparatus 31 or combined pruning apparatus.

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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)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Resistance Heating (AREA)
EP15157427.4A 2014-03-28 2015-03-03 Dispositif de chauffage destiné à chauffer une platine de tôle Withdrawn EP2924130A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014104398.7A DE102014104398B4 (de) 2014-03-28 2014-03-28 Erwärmungsvorrichtung zum konduktiven Erwärmen einer Blechplatine

Publications (1)

Publication Number Publication Date
EP2924130A1 true EP2924130A1 (fr) 2015-09-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15157427.4A Withdrawn EP2924130A1 (fr) 2014-03-28 2015-03-03 Dispositif de chauffage destiné à chauffer une platine de tôle

Country Status (4)

Country Link
US (1) US20150282253A1 (fr)
EP (1) EP2924130A1 (fr)
CN (1) CN104946861B (fr)
DE (1) DE102014104398B4 (fr)

Cited By (2)

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WO2017020888A1 (fr) * 2015-08-04 2017-02-09 Benteler Automobiltechnik Gmbh Dispositif et procédé pour effectuer un traitement de revenu local d'éléments métalliques
WO2022073554A1 (fr) * 2020-10-05 2022-04-14 HEGGEMANN Aktiengesellschaft Procédé de traitement d'une ébauche de tôle électriquement conductrice

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DE102015122390A1 (de) * 2015-12-21 2017-06-22 Scania Cv Ab Verfahren zur konduktiven Erwärmung eines flächig ausgebildeten metallischen Bauteils
US20180106546A1 (en) 2016-10-17 2018-04-19 Novelis Inc. Metal sheet with tailored properties
KR20200143970A (ko) * 2019-06-17 2020-12-28 현대자동차주식회사 강판 가열 장치
IT201900022794A1 (it) * 2019-12-03 2021-06-03 Giuseppe Campari Tampone di rinvenimento lamiera
CZ309053B6 (cs) 2020-10-30 2021-12-29 Západočeská Univerzita V Plzni Plechový polotovar, určený pro hlubokotažné tváření a pro odporový ohřev elektrickým proudem
US12012641B2 (en) 2020-11-23 2024-06-18 GM Global Technology Operations LLC Combined heating and transfer of work-piece blanks
CN114340057B (zh) * 2021-11-30 2023-05-23 同济大学 消除超薄金属板导电加热变形的导电加热装置
CN115996552B (zh) * 2023-03-22 2023-06-13 武汉嘉晨电子技术有限公司 一种汽车bdu散热结构及其制造方法

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US20070215588A1 (en) * 2006-03-16 2007-09-20 Noble International, Ltd. Method and apparatus for the uniform resistance heating of articles
DE102012110649B3 (de) * 2012-11-07 2013-11-14 Benteler Automobiltechnik Gmbh Warmformlinie sowie Verfahren zur Herstellung eines warmumgeformten und pressgehärteten Kraftfahrzeugbauteils

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EP2182082B2 (fr) * 2008-10-29 2018-01-24 Neue Materialien Bayreuth GmbH Procédé et dispositif destinés à l'équilibrage de la température d'un corps en tôle d'acier
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Publication number Priority date Publication date Assignee Title
DE10212819B4 (de) 2002-03-22 2004-07-08 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines metallischen Bauteils
US20070215588A1 (en) * 2006-03-16 2007-09-20 Noble International, Ltd. Method and apparatus for the uniform resistance heating of articles
DE102012110649B3 (de) * 2012-11-07 2013-11-14 Benteler Automobiltechnik Gmbh Warmformlinie sowie Verfahren zur Herstellung eines warmumgeformten und pressgehärteten Kraftfahrzeugbauteils

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017020888A1 (fr) * 2015-08-04 2017-02-09 Benteler Automobiltechnik Gmbh Dispositif et procédé pour effectuer un traitement de revenu local d'éléments métalliques
US10954575B2 (en) 2015-08-04 2021-03-23 Benteler Automobiltechnik Gmbh Device and method for tempering sections of metal components
WO2022073554A1 (fr) * 2020-10-05 2022-04-14 HEGGEMANN Aktiengesellschaft Procédé de traitement d'une ébauche de tôle électriquement conductrice

Also Published As

Publication number Publication date
DE102014104398B4 (de) 2016-06-16
CN104946861A (zh) 2015-09-30
CN104946861B (zh) 2018-01-02
DE102014104398A1 (de) 2015-10-01
US20150282253A1 (en) 2015-10-01

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