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EP3276012A1 - Station de chauffage avec conducteur chauffant en gaine - Google Patents

Station de chauffage avec conducteur chauffant en gaine Download PDF

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Publication number
EP3276012A1
EP3276012A1 EP16181981.8A EP16181981A EP3276012A1 EP 3276012 A1 EP3276012 A1 EP 3276012A1 EP 16181981 A EP16181981 A EP 16181981A EP 3276012 A1 EP3276012 A1 EP 3276012A1
Authority
EP
European Patent Office
Prior art keywords
temperature control
mantelheizleiter
station according
control station
plate
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Withdrawn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
EP16181981.8A
Other languages
German (de)
English (en)
Inventor
Stefan Konrad
Peter Summerauer
Christian Rüsing
Max Sander
Simon Werneke
Stefan Horn
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
Priority to EP16181981.8A priority Critical patent/EP3276012A1/fr
Publication of EP3276012A1 publication Critical patent/EP3276012A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • 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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0236—Industrial applications for vehicles
    • H05B1/0238—For seats
    • 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
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching

Definitions

  • the present invention relates to a tempering station for a hot forming line according to the features in the preamble of claim 1.
  • ovens in particular continuous ovens are used to heat the sheet steel blanks to above AC3 temperature.
  • these furnaces have the disadvantage that a targeted partial heating is not possible.
  • a corresponding expenditure of energy for operating the Continuous furnace necessary.
  • the furnace interior is also warmed up with the furnace itself, whereby a corresponding power loss of the heat energy required for heating is recorded.
  • tempering plates are used.
  • the contact plates themselves are heated via a heat source arranged at the rear, for example an inductor.
  • the heat of the contact plate is transferred to the sheet steel plate by means of heat conduction.
  • the object of the present invention is, starting from the prior art, to provide a tempering station for a hot forming line with which it is possible to heat sheet steel blanks in a targeted manner to a greater or equal AC3 temperature, wherein the tempering station can be operated under effective energy yield.
  • At least one jacket heating conductor for mold temperature control for thermoforming applications.
  • the tempering station is intended for a hot forming line. This is followed by the temperature control station, a hot forming tool and optionally a press hardening tool. The latter can also be designed as a combined hot-forming and press-hardening tool.
  • the tempering station is designed according to the invention as Griffiner michrmungsstation. It has at least one lower tool, optionally also an upper tool.
  • the tempering is associated with at least one tempering, which preferably arranged on the lower tool is, wherein the sheet steel plate is placed on the temperature control plate and is heated by heat conduction from the temperature control plate. Alternatively or additionally, the temperature control plate is pressed onto the sheet steel plate.
  • At least one jacket heating conductor is arranged in the temperature control plate, in particular in a groove of the temperature control plate, wherein the jacket heating conductor is heated by applying electrical energy to a temperature greater than 800 ° C.
  • the Mantelchipleiter is heated to a temperature greater than 850 ° C, more preferably greater than 900 ° C, most preferably greater than 950 ° C. It would be possible to heat the Mantelchipleiter to a temperature up to 1100 ° C.
  • the jacket heating conductor itself transfers its heat to the temperature control plate, so that a surface temperature at the temperature control plate is at least partially greater than the AC3 temperature achieved.
  • the applied sheet steel plate is thus heated by heat conduction from the temperature control plate to the sheet steel plate to a temperature in particular greater than or equal to AC3. This corresponds to the recrystallization temperature.
  • the invention thus also relates to a method for operating the tempering station.
  • Manteldiess By electrical resistance heating of the Manteldiess itself can be adjusted specifically the energy required for heating.
  • the Mantelchipleiter itself is particularly close to the surface, arranged on the sheet steel plate to be heated. This makes it possible that the heat generated by the electrical resistance heating is conducted over short distances by means of heat conduction in the sheet steel plate or in the Temperierplatte and from this in the sheet steel plate.
  • the jacket heating conductor has in particular an electrically insulating and thermally conductive jacket. This enables continuous heating to be performed by applying electric power.
  • the heating need not be interrupted, for example, when closing the temperature control or contact with the sheet steel plate to be heated simultaneously because no electrical short circuit is generated.
  • the jacket is preferably formed from a nickel-based alloy. Below is a magnesium oxide insulator. In the core, a nickel conductor is preferably arranged. The MantelLiteleiter is preferably designed as a coaxial conductor.
  • the tempering station preferably has an upper tool and a lower tool.
  • the lower tool and / or the upper tool according to the invention has a tempering with integrated MantelLiteleiter.
  • the upper tool or the lower tool can also have an insulating layer.
  • the heat transfer due to heat conduction from the temperature control plate to the sheet steel plate to be heated is promoted by application of a press pressure.
  • the temperature control plate is particularly preferably formed in several parts. In particular, this is divided into several segments. Each segment thus has an area with mutually different temperatures.
  • each segment of the temperature control plate preferably has its own jacket heating conductor.
  • a thermally insulating separating gap and / or a cooling channel is preferably arranged. This makes it possible to produce particularly sharply bordered transition areas between the individual areas heated with different temperatures in the sheet steel plate.
  • a cooling channel may be arranged, which is formed between two segments. Thus, a bound partial tempering can be performed. The self-adjusting heat conduction within the sheet steel plate is largely suppressed during the tempering process.
  • the jacket heating conductor is arranged in a multiply wound essentially in one plane in the temperature control plate.
  • a bending radius preferably corresponds to 2 to 3 times the diameter of the MantelLiteleiters.
  • Mantelchipleiter are arranged side by side in a plane.
  • several turns are then arranged one above the other, thus in several levels.
  • the groove can be produced, for example, by milling out the temperature control plate.
  • the Mantelchipleiter is preferably arranged either with a press fit or with a clearance fit. In a press fit substantially no gap between the outer circumferential surface of the Mantelsammlungleiters and inner surface of the groove is formed. This results in a particularly effective heat transfer from the Mantelsammlungleiter to the temperature control.
  • the jacket heating conductor is molded or pressed into the groove.
  • the cross-sectional configuration of the Mantelellesleiters is changed or deformed. For example, in the initial state, a round cross-section of the Mantelanneleiters can be changed due to the press-fit into the groove in an oval or rectangular cross-section.
  • a clearance fit is formed between Mantelbindleiter and groove, so that a gap is present.
  • This gap can be poured, for example, with a solder material or with a thermally stable resin system.
  • a temperature control can be divided into two horizontally or multi-layered in the layer system.
  • the groove is not formed on a plant top but in a central separation area between the two horizontal parts and inserted the heating element. Subsequently, both horizontal parts are placed on each other.
  • a system side coming into contact with the sheet steel plate thus has, in particular, a smooth or even surface.
  • a horizontal layered structure of the temperature control is conceivable.
  • individual sheet metal layers are cut open, for example, lasered and layered on top of each other. The cut-out areas then form the groove for inserting the MantelLiteleiters.
  • two or three levels may be formed in the temperature control.
  • a Mantelloomleiter is arranged in each level.
  • optimal grid utilization can be symmetrical with a three-phase voltage and the resulting reactive current can be minimized. As a result, the effectiveness for operating the tempering is further increased and thus reduced operating costs.
  • a thermally conductive filler is arranged in a clearance fit between the groove and the Mantelbindleiter.
  • a nickel-based solder is used.
  • the temperature control itself may have cooling channels and / or the temperature control can be assigned cooling channels.
  • the temperature control is at least partially cooler. This offers the possibility of a targeted temperature control and the avoidance of hotspots due to a region to strong heat generation.
  • the temperature control station can thus be operated fail-safe and permanently.
  • an insulating layer is preferably arranged on the side of the tempering plate opposite the sheet steel plate.
  • the gap between the temperature control plate and Mantelbindleiter greater than zero may be formed, optionally optionally in the gap, a heat-conductive filler is disposed so that the surface pressure occurring when closing the temperature control is not transferred to the Mantelbindleiter.
  • the Manteldies can lie substantially circumferentially with the tempering plate over the entire surface. In particular, then when closing the Temperature control occurring surface pressure also transferred to the Manteldiesleiter. As a result, a higher mechanical load of the Mantelsammlungleiters conditional, but at the same time provides better heat conduction of the heat generated by the Mantelsammlungleiter to the temperature control and then to the sheet steel plate to be heated.
  • FIG. 1 1 shows a longitudinal sectional view through a tempering station 1 according to the invention.
  • a sheet steel plate 2 made of a hardenable steel alloy is arranged between a lower tool 3 and an upper tool 4.
  • the tempering 1 according to FIG. 1 is shown in the open state.
  • the sheet steel plate 2 is raised by lifting pins 5, so that they can be taken for example by a robot arm, not shown, or a linear transfer system.
  • the lower tool 3 and the upper tool 4 each have a tool surface 6, which come into contact with a respective surface 7 of the sheet steel plate 2 in the closed state in plant contact.
  • 4 tempering 8 are arranged in the lower tool 3 but also in the upper tool.
  • the temperature control plates 8 each have individual segments 9, 10, 11. Between the segments 9, 10, 11, gaps 12 are formed. Thus, it is possible to heat each segment 9, 10, 11 at a different temperature from each other. It is also conceivable to switch on or off individual tempering plates by standardized tempering plate sizes with different component geometry.
  • bevels 28 are formed at the edges. These prevent heat conduction between the individual temperature zones on the board to be heated.
  • the chamfers 28 may instead of on the tool surface 6 also be arranged on the opposite side and thus closer to the level of the Mantelfilleiter on which the largest temperature prevails.
  • jacket heating conductors 13 are arranged in grooves 14. Shown here are in the temperature control plate 8 of the upper tool 4 and the temperature control 8 of the lower tool 3 each three Mantelsammlungleiter 13 arranged one above the other and wound in more than each plane multiple times. However, only one Mantelsammlungleiter 13 may be arranged in a plane.
  • the respective jacket heating conductor 13 is arranged in a groove 14.
  • the groove 14 is introduced in this example from a respective rear side 15 of the temperature control 8, so that the tool surface 6 is formed homogeneous or smooth and flat.
  • the tempering 8 has a closing plate 16. On the back 15 of the closing plate 16, an insulating layer 17 is arranged, again followed by a respective base plate 18 of the upper tool 4 and lower tool 3. Here is still in the base plate 18 of the lower tool 3, a cooling channel 19th
  • FIG. 2 shows a plan view of the sheet steel plate to be heated 2.
  • the tempering plate 8 in turn has three segments 9, 10, 11, so that different temperature ranges are set from each other.
  • the temperature range of the segment 9 is adjusted to 950 ° C.
  • the temperature of the regions 10 and 11 is adjusted to, for example, 600 ° C., in any case lower than the recrystallization temperature.
  • the outer contour of the temperature control plate 8 is approximated to the outer contour of the sheet steel plate 2. As a result, the efficiency for heating is further increased, since substantially no areas of the temperature-control plate 8 not covered by the sheet steel plate 2 are heated.
  • FIG. 3 shows the temperature control plate 8 with the steel plate 2.
  • FIG. 4 shows a plan view of a bottom view of the temperature control plate 8 with the individual segments 9, 10, 11. It can be seen that in each segment, a multi-wound Mantelchipleiter 13 is arranged, so that each segment is heated homogeneously. For example, a groove milling for inserting the MantelMapleiters 13 done from the back of the tempering 8 ago or also from a tool surface 6 ago. A tempering plate as a casting or from a 3D printing with integrated grooves is also possible.
  • FIGS. 5a to c now show exemplary cross-sectional views along the section line AA of FIG. 4 .
  • FIGS. 5a to c show a relation to the vertical direction of three-layer structure of a tempering 8.
  • two MantelLiteleiter 13 between the three layers 20, 21, 22 distributed arranged extending.
  • FIG. 5b shows the assembly in explosive representation.
  • the grooves 14 are inserted into the individual layers 20, 21, 22 and the Mantelsammlungleiter 13 arranged therebetween.
  • the Mantelsammlungleiter 13 itself has a round in cross-section configuration.
  • the cross-sectional profile of the groove 14 in composite layers is also round. This is clearly visible in FIG. 5c , There thus remains a gap 23 between Mantelsammlungleiter 13 and groove 14.
  • This is preferably filled with a thermally conductive or thermally conductive filler 24.
  • a screw 29 for screwing the individual layers 20, 21, 22 may be provided.
  • FIGS. 6a to c show an analogous structure FIG. 5a to c.
  • the groove 14 in cross section itself is not round but square or square. Consequently, more of the thermally conductive filler 24 is arranged between the jacket heating conductor 13 and the groove 14. The MantelLiteleiter 13 is also not deformed.
  • FIGS. 7a to 7c show a three-layer structure according to FIG. 5a to c.
  • the middle layer 21 is formed as a plate and the grooves 14 are respectively formed in the upper layer 20 and the lower layer 22 U-shaped.
  • a corresponding filler 24 is used to fill the resulting gap 23 between MantelLiteleiter 13 and groove 14.
  • FIGS. 8a and b also show a multilayer structure.
  • three Mantelchipleiter 13 are arranged one above the other in the vertical direction V.
  • 15 grooves 14 are milled on the backs. These are then closed with inserted Mantelsammlungleitern 13 with a closing plate 16.
  • FIGS. 9a and b show another variant.
  • An initially according to FIG. 9a in cross-section round Mantelsammlungleiter 13 is inserted into a U-shaped groove 14.
  • this groove 14 is not adapted to the cross-sectional configuration of the Mantelsammlungleiters 13, so that when closing the groove 14 with inserted Mantelsammlungleiter 13, this is changed in its cross-sectional configuration of round, for example, a square transition.
  • a closing plate 16 is disposed on the opposite side of the tool surface 6, shown in FIG FIG. 9c ,
  • the groove can in particular be filled in a tempering 8 without closing plate 16 complementary with solder 30 to ensure a secure fixation during operation.
  • FIG. 10 shows a further embodiment variant.
  • a gap 23 remains between the groove 14 and the Mantelsammlungleiter 13.
  • a oriented in the vertical direction V force F is thus transmitted to the contact regions 26 of the layers 20, 21 between the individual loops of the Mantelsammlungleiter 13.
  • the mechanical load of the Mantelsammlungleiter 13, for example, due to thermal expansion and / or surface pressures incurred in closed temperature control 1 are thereby reduced.
  • the energy needed to heat up is greater than that of FIG. 11 ,
  • FIG. 11 shows a design variant in which no gap between an outer circumferential surface 27 of the MantelLiteleiters 13 and the individual layers 20, 21, or the grooves 14 remains.
  • a oriented in the vertical direction V force F is thus also carried by the outer circumferential surface 27 of the MantelMapleiter 13.
  • the heat conduction from the Mantelsammlungleiter 13 to the temperature control plate 8 is better in this variant, so that a lower energy density is needed.
  • FIG. 12 A and b show a production variant for a tempering 8 with arranged therein MantelLiteleiter 13.
  • a groove 14 is covered with individual loops of Mantelsammlungleiters 13 and then filled with a filler 24, for example, a solder or the like.
  • a resulting uneven tool surface 6 for subsequent contact with a sheet steel plate, not shown, can be processed in a subsequent processing step, for example, be milled plan, which in FIG. 12b is shown.
  • the Mantellacleiter 13 is in cross section in FIG. 13 shown.
  • This has a core 31, which is formed in particular of a nickel alloy.
  • the core 31 encloses peripherally an insulator 32.
  • the insulator 32 is preferably a magnesium oxide insulator.
  • An outer jacket 33 is again preferably formed of a nickel-based alloy.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
EP16181981.8A 2016-07-29 2016-07-29 Station de chauffage avec conducteur chauffant en gaine Withdrawn EP3276012A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP16181981.8A EP3276012A1 (fr) 2016-07-29 2016-07-29 Station de chauffage avec conducteur chauffant en gaine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP16181981.8A EP3276012A1 (fr) 2016-07-29 2016-07-29 Station de chauffage avec conducteur chauffant en gaine

Publications (1)

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EP3276012A1 true EP3276012A1 (fr) 2018-01-31

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EP16181981.8A Withdrawn EP3276012A1 (fr) 2016-07-29 2016-07-29 Station de chauffage avec conducteur chauffant en gaine

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220112568A1 (en) * 2020-10-14 2022-04-14 Benteler Automobiltechnik Gmbh Method for producing a steel blank and temperature-adjusting station

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2182081A1 (fr) 2008-10-29 2010-05-05 Neue Materialien Bayreuth GmbH Procédé et dispositif destinés au traitement thermique d'un corps en tôle d'acier revêtu
EP2237639A1 (fr) * 2008-01-25 2010-10-06 Aisin Takaoka Co., Ltd. Dispositif et procédé permettant de chauffer un matériau
US20110303330A1 (en) * 2010-06-11 2011-12-15 Toyoda Iron Works Co., Ltd. Steel sheet heating device, method for producing press-formed part, and press-formed part
DE102013101790A1 (de) * 2013-02-22 2014-08-28 Universität Bremen Temperiervorrichtung, Anlage zur Temperierung und Verfahren zur Temperierung
EP2907881A2 (fr) * 2014-02-07 2015-08-19 Benteler Automobiltechnik GmbH Ligne moulée à chaud et procédé de fabrication de produits de tôle moulés à chaud

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2237639A1 (fr) * 2008-01-25 2010-10-06 Aisin Takaoka Co., Ltd. Dispositif et procédé permettant de chauffer un matériau
EP2182081A1 (fr) 2008-10-29 2010-05-05 Neue Materialien Bayreuth GmbH Procédé et dispositif destinés au traitement thermique d'un corps en tôle d'acier revêtu
US20110303330A1 (en) * 2010-06-11 2011-12-15 Toyoda Iron Works Co., Ltd. Steel sheet heating device, method for producing press-formed part, and press-formed part
DE102013101790A1 (de) * 2013-02-22 2014-08-28 Universität Bremen Temperiervorrichtung, Anlage zur Temperierung und Verfahren zur Temperierung
EP2907881A2 (fr) * 2014-02-07 2015-08-19 Benteler Automobiltechnik GmbH Ligne moulée à chaud et procédé de fabrication de produits de tôle moulés à chaud

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220112568A1 (en) * 2020-10-14 2022-04-14 Benteler Automobiltechnik Gmbh Method for producing a steel blank and temperature-adjusting station
DE102020127057A1 (de) 2020-10-14 2022-04-14 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung einer Stahlplatine sowie Temperierstation
EP3985133A2 (fr) 2020-10-14 2022-04-20 Benteler Automobiltechnik GmbH Procédé de fabrication d'une platine d'acier, ainsi que station de thermorégulation
EP3985133A3 (fr) * 2020-10-14 2022-06-15 Benteler Automobiltechnik GmbH Procédé de fabrication d'une platine d'acier, ainsi que station de thermorégulation

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