EP2639536B1 - Installation de four et procédé de fonctionnement de l'installation de four - Google Patents

Installation de four et procédé de fonctionnement de l'installation de four Download PDF

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Publication number
EP2639536B1
EP2639536B1 EP13157845.2A EP13157845A EP2639536B1 EP 2639536 B1 EP2639536 B1 EP 2639536B1 EP 13157845 A EP13157845 A EP 13157845A EP 2639536 B1 EP2639536 B1 EP 2639536B1
Authority
EP
European Patent Office
Prior art keywords
board
temperature
radiant heat
cooling
kiln assembly
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.)
Active
Application number
EP13157845.2A
Other languages
German (de)
English (en)
Other versions
EP2639536A2 (fr
EP2639536A3 (fr
EP2639536B8 (fr
Inventor
Stefan Adelbert
Borek Dvorak
Radovan Kout
Martin Pohl
Andreas Stosch
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
Priority claimed from DE102012102193.7A external-priority patent/DE102012102193B4/de
Priority claimed from DE201210102194 external-priority patent/DE102012102194A1/de
Application filed by Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Publication of EP2639536A2 publication Critical patent/EP2639536A2/fr
Publication of EP2639536A3 publication Critical patent/EP2639536A3/fr
Publication of EP2639536B1 publication Critical patent/EP2639536B1/fr
Application granted granted Critical
Publication of EP2639536B8 publication Critical patent/EP2639536B8/fr
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Anticipated expiration legal-status Critical

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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
    • F27B5/00—Muffle furnaces; Retort furnaces; Other furnaces in which the charge is held completely isolated
    • F27B5/06—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B5/14—Arrangements of heating devices
    • 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
    • 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
    • F27B9/021—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 having two or more parallel tracks
    • 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
    • F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
    • F27B9/045—Furnaces with controlled atmosphere
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
    • F27D21/0014—Devices for monitoring temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D99/0035—Heating indirectly through a radiant surface
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D9/00—Cooling of furnaces or of charges therein
    • F27D2009/007—Cooling of charges therein
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D2099/0045—Radiant burner

Definitions

  • the present invention relates to a furnace for the thermal treatment of metallic circuit boards according to the features in the preamble of claim 1.
  • the present invention further relates to a method for operating a furnace installation according to the invention according to the features in claim 17.
  • a heating device is known in which semi-finished products are heated to different temperatures within different temperature zones. Subsequently, the semi-finished products heated to different temperatures are hot-worked and press-hardened in a hot forming and press hardening process.
  • bulkheads are arranged within the heating device and separate the temperature zones from each other transversely to the conveying direction. Each temperature zone is assigned a heater and a circulation device.
  • a conductive plate heating of the metal plate is known, wherein after the heating, an intermediate cooling is carried out with the aid of tempered cooling plates.
  • the conductive tempering agents are part of a hot forming line, for setting partially different ductility.
  • the furnace installation according to the invention for the thermal treatment of metallic circuit boards, in particular for the thermal treatment of coated boards of a hardenable steel alloy by means of radiant heat, wherein at least two areas of the board are heat treated at different component temperatures, is characterized in that a first area of the board by a radiant heat source is temperable at a temperature of at least AC3 and a second region of the circuit board conductively at a Temperature under AC3 is tempered, wherein in the furnace system for conductive heat treatment of the second areas cooling plates are arranged.
  • a radiant heat source is used to control the temperature of the first area.
  • the furnace installation according to the invention makes it possible on the one hand to treat the component at a temperature of at least austenitizing temperature, that is to say AC3 temperature, in a particularly energy-efficient manner by means of a radiant heat source via radiant heat.
  • the radiant heat source is designed in particular as a gas burner for burning fossil fuels.
  • By means of the radiant heat it is then possible to heat the board within the furnace either from a cold state, substantially at room temperature, to a heated state of austenitizing temperature or above the austenitizing temperature.
  • the generation of the second region is made possible by conductive heat treatment.
  • a cooling plate at least partially brought into positive contact with the board.
  • the second region is then conductively thermally treated via the positive contact. Again, it is possible to heat the board from substantially room temperature to a temperature above room temperature. However, the second region is heated to a temperature below the AC3 temperature, in particular below the AC1 temperature, and therefore not completely austenitized.
  • the second region it is also possible to cool the second region at a temperature fully heated to Austenitmaschinestemperatur board by means of the plate, in particular the cooling plate, from the austenitizing, ie of AC3, to a temperature below AC3.
  • the second Area cooled to a temperature below AC1.
  • the AC1 and AC3 points are mainly determined by the alloy composition of the used hardenable steel alloy of the board. As a rule, however, the AC3 temperature point is above 900 ° C.
  • the second region is therefore significantly cooled to a temperature below 900 ° C., wherein the second region is very particularly preferably cooled to a temperature in relation to the first region, so that a temperature difference to the first range of 100 °, more preferably 350 °, most preferably 400 ° and in particular 450 ° C.
  • a first range is heated to above AC3 temperature and a second range to below AC3 temperature.
  • a homogeneous heated to at least AC3 temperature board is spent by a heating device in the furnace installation according to the invention and kept in the furnace in a first range to at least AC3 temperature, the circuit board in a second region conductive on a temperature below AC3 temperature is cooled, in particular below AC1 temperature.
  • a third preferred embodiment variant it is possible to first heat the entire board to a temperature above AC3 within the furnace installation according to the invention and then partially conductively cool it in second areas to a temperature below AC3, wherein a first area is kept at AC3 temperature.
  • first regions or a plurality of second regions can be formed in the circuit board.
  • third areas which of the first areas and the second Areas also have a different temperature.
  • the conductive heating or conductive cooling it is possible in particular by the conductive heating or conductive cooling to set the temperature individually in a respective area.
  • the radiant heat source is designed as a gas burner, in particular, the radiant heat source is designed as at least one radiant tube, more preferably at least one radiant tube near an upper side of the board is arranged and / or a Strahltropicrohr is disposed near an underside of the board.
  • the radiant heat source is designed as a gas burner in particular fossil fuels are burned in the radiant heat source, which is why the heating with a good energy efficiency compared to an induction heating or convection heating is feasible.
  • it is possible to directly heat the board by the radiant heat source so it does not require a long preheating or warming up the furnace itself, since the radiant heat is directly and fully present immediately after switching on the gas burner and the furnace chamber has a total of a small volume ,
  • the radiant heat source is designed as a radiant tube, wherein a plurality of radiant tubes can be arranged in the furnace, so that they are arranged above the area to be heated or maintained at a temperature flat plate.
  • the radiant tube can also be arranged in the form of a heating coil above the board.
  • the radiant heating tube is arranged in a vertical direction relative to the top of the board, wherein the radiant heating tube within the scope of the invention is furthermore preferably arranged as close as possible to the upper side of the board.
  • an optimal distance between the board and StrahlMaprohr is formed so that the furnace can be charged with the board, means for conductive temperature between the radiant heat source and board can be arranged, and at the same time as low as possible Distance between radiant heat source and board is formed so that as little heat radiation is radiated as a waste heat radiation in the rest of the furnace environment.
  • a distance of radiant heat source between 1 cm and 100 cm, preferably 10 cm and 50 cm.
  • the radiant heat source itself displaceably in the furnace installation so that, for example, after a charging process, the radiant heat source can be lowered in the direction of the board located in the furnace installation.
  • a radiant heat source can also be arranged in a vertical direction below the board.
  • the board is mounted on a grid-like grate or on a roller carrier or other permeable or perforated carrier, so that radiant heat from the bottom can get to the board.
  • At least one panel is designed to be displaceable in the horizontal direction above a board located in the furnace installation, wherein the panel can be placed between the board and the radiant heat source.
  • At least one panel is arranged pivotably above a board located in the furnace installation, wherein the panel is infinitely pivotable between the board and the radiant heat source.
  • shielding elements are arranged in a heating chamber of the furnace system, which shield the radiant heat from the board and / or lead to the board.
  • the shielding elements are in particular designed as baffles or as diaphragms, wherein in particular at a radiation heat source located above the printed circuit board preferably at least one diaphragm is designed to be displaceable in the horizontal direction, wherein the diaphragm can be placed between the circuit board and the radiant heat source.
  • at least one aperture is pivotally arranged above a board located in the furnace plant, wherein the aperture is arranged steplessly pivotable between the board and the radiant heat source and thus the heat input is selectively adjustable in a second region of the board.
  • the means for conductive temperature control can furthermore be arranged below the diaphragm, so that they likewise are not exposed to the direct thermal load of the radiant heat source. Due to the possibility of the pivoting of the aperture or even the displaceability of the aperture, it is possible to apply the furnace for different sized boards or for different sized areas within the boards.
  • a partition and / or a cover is arranged in the furnace, wherein the temperature zone generated by the radiant heat is separated from the rest of the heating chamber and / or thermally insulated by the partition and / or by the cover.
  • the partitions or even the side walls of the cover are significantly oriented in the vertical direction and can be particularly actively lowered to a board located in the furnace system.
  • additional means for example an active cooling device
  • transport means are arranged in the furnace installation, wherein the board can be displaced in the horizontal direction via the transport means.
  • the means of transport are particularly preferably transport rollers or transport chains. In the context of the invention, however, it may also be transport rails. Further preferably, it is possible to insert the board in the furnace installation according to the invention via a manipulator. Furthermore, it is possible within the scope of the invention to make the transport means as an extract in such a way that they work in the manner of operation of a drawer.
  • the board within the furnace system in the vertical direction can be raised, in particular by at least one lifting element.
  • radiant heat source stationarily arranged in the furnace and fixedly arranged conductive thermal treatment means, in particular cooling plates it is thus possible to transport the board in a simple manner in the furnace in the horizontal direction and, if it has reached its position, via the lifting device in the vertical Direction towards the radiant heat source towards oriented to raise and optionally while pressing against the cooling plates.
  • the board is storable on an insulating layer within the furnace, in particular, the board with the insulating layer can be raised, wherein the board preferably rests at least partially on the insulating layer.
  • the insulating layer is designed in particular as a carrier layer, wherein the board very particularly preferably rests over the entire surface of the insulating layer and further preferably with the insulating layer in the furnace system can be moved, is thermally treatable in this and then removed again with the insulating layer of the furnace is.
  • the insulating layer is formed in particular from an insulating material and / or a ceramic material, wherein the insulating material has a sufficient temperature resistance, so that it tolerates the temperatures of sometimes over AC3 over the entire time of the heat treatment.
  • the insulating layer in the context of the invention has a multilayer structure, wherein the insulating layer furthermore preferably has a thickness of more than 1 cm, very particularly preferably more than 2 cm and in particular more than 5 cm, as a single-layered or multi-layered insulating layer.
  • this insulating layer should not be significantly thicker than 30 cm, so that in the case of a carrier layer, it is possible to handle insulating layer with a printed circuit board.
  • At least one temperature sensor is arranged in the insulating layer.
  • the temperature sensor in the insulating layer it is thus possible to draw conclusions about the heating of the component. If the radiant heat is only passed over the surface to the board, it enters the board at the surface and in the board itself it is distributed over heat conduction. If a temperature is now measured on a lower side, that is to say in the insulating layer, then the component temperature can be determined in a particularly reliable manner or the component temperature can be measured directly.
  • a direct sensor contact is made to the underside of the board.
  • separating layers are arranged in the insulating layer itself, the separating layers being oriented vertically and correspondingly extend to the at least two mutually different temperature ranges of the board along a transition region.
  • the separating layer is formed as a vertically oriented parting line on the surface of the insulating layer. Between the two mutually different areas of the board, a separation is thus made on the underside, so that it does not come with a transferring into the insulating heat conduction to a forwarding to the second area.
  • the insulating layer is either filled in the case of a parting line with air or formed in the case of a physically existing material with a material which has a low thermal conductivity.
  • the insulating layer is designed as a platinum carrier, wherein the board lying on the platinum carrier together with the platinum carrier is inserted into the furnace and also from this again executable.
  • cooling plates are arranged for the conductive heat treatment of the second regions, wherein the cooling plates are preferably arranged above and / or below the circuit board.
  • the heat radiation tubes are arranged in a vertical direction relative to the board.
  • the cooling plates are also preferably arranged above the board, so that the cooling plates on the one hand by their positive contact with the circuit board cool this conductively, on the other hand, the second regions of the board from the radiant heat source analogous to a diaphragm shut off. The radiant heat thus does not hit the second areas.
  • the cooling plates are arranged below the board. As a result, are then cooled in the second parts of the board of the cooling plates from the bottom, so that the cooling plates themselves are not exposed to the radiant heat on the top of the board.
  • the cooling plates can be arranged on the one hand stationary within the furnace, so that then the board through the lifting device is raised to the cooling plates, so that a positive contact is made for conductive thermal treatment.
  • the cooling plates are arranged stationarily in the furnace system, so that they ensure a durable, robust use.
  • the cooling plates themselves are actively displaced in the furnace system.
  • the cooling plates can be lowered via a linear guide on a board inserted into the furnace system.
  • the cooling plates within the furnace system can be pivoted, in particular also not only vertically, but also horizontally pivotable, so that the second areas are changeable in their position on the board, offset on the other via the relative displacement of the cooling plates positioning inaccuracies of the board can be.
  • the cooling plates are preferably coated. Furthermore, the cooling plates are actively cooled, with a cooling medium can be conducted through the cooling plates. This makes it possible to selectively adjust the temperature within the cooling plate, which is required in order to set the desired temperature specifically via the conductive heat transfer of the cooling plate in the second region of the component.
  • the cooling plate is formed insulated from the heat radiation, in particular, the cooling plate is covered by a cooling plate insulation, which is arranged between the cooling plate and the radiant heat source. This prevents that the cooling plate unnecessarily heated during operation of the furnace, so that the radiant heat is shielded by the cooling plate insulation of the cooling plate itself and the cooling plate is held by the self-cooling due to the cooling medium flowing through the cooling plate at a subcritical temperature level.
  • sensors are integrated in the cooling plate itself or the sensors monitor the cooling plate externally. To meet various component requirements, it is advantageous if the insulation and / or cover is easily removable or exchangeable to bring a targeted low cooling capacity in the board in a second area.
  • a temperature sensor is arranged in a return channel of the cooling medium, wherein the temperature of the cooling plate can be determined via the measured temperature of the cooling medium.
  • the cooling plates arranged above the board are arranged between a board surface and the radiant heat and / or the cooling plates arranged underneath the board, which are integrated in the insulating layer or pass through the insulating layer.
  • the cooling plates themselves such that no radiant heat reaches the surface of the board in the area below the cooling plate.
  • the surface of the board is cooled by the cooling plate, i. H. from an AC3 temperature to a below AC3 temperature or to a temperature below AC3.
  • cooling plates arranged underneath the board are either integrated directly into the insulating layer or else formed in such a way that they pass through the insulating layer.
  • the board is thus transported either with or without an insulating layer in the furnace, in which case the cooling plates, the insulating layer by cross-formally brought into contact with the board, so that a conductive heat transfer takes place.
  • At least one temperature sensor is arranged in the furnace installation, which performs a non-tactile temperature measurement, wherein the temperature sensor measures at least one component temperature of the board, in particular of a region.
  • the temperature sensor may be in the context of Invention act to an infrared sensor, which receives the component temperature prevailing there on a surface of the board.
  • it is then possible to react by means of the radiant heat source and / or the cooling plates in such a way by a control or regulation that a higher or lower heating power or a higher or lower cooling capacity is set or adjusted.
  • the radiant heat emitted by the radiant heat source is adjustable by controlling or regulating the supply of fossil fuel and / or oxygen or air, wherein at a loading process of the furnace the power of the radiant heat source can be converted into a minimum operation or even the radiant heat source is turned off.
  • the furnace system uses in particular the principle of radiant heat, thereby avoiding driving long heating times or lead times of the furnace to bring the furnace atmosphere to operating temperature. The heating takes place approximately, in particular exclusively, by the radiant heat, which is why the furnace system is ready for use immediately after activation of the radiant heat source. In a charging process itself no radiant heat is needed, which is why the radiant heat source can be converted into a minimum operation.
  • a minimum operation is to be understood as such a reduced combustion operation, so that it is then possible, without a renewed ignition process, to bring the radiant heat source back to an operating power or to a maximum power. In the context of the invention, however, it is also possible to completely shut off the radiant heat source during the charging process.
  • a suction device is connected to the furnace, so that exhaust gas generated during the combustion of the radiant heat source can be sucked out of the heating chamber.
  • the exhaust gas is then used according to the invention in three ways.
  • heat contained in the exhaust gas which can be supplied to another production process or can also be used to heat the cooling medium of the cooling plates or to preheat the air or the oxygen. Because the second areas through the cooling plates To be cooled to a temperature between about 400 ° and 850 ° C either over Austenitmaschinestemperatur or heated to this aforementioned temperature interval, it also requires a temperature of the cooling medium in a correspondingly high temperature range. The cooling medium is thus to be heated relative to the room temperature, wherein for heating exclusively or in addition, the heat energy contained in the exhaust gas is available.
  • a second possible use of the extracted exhaust gas is that the exhaust gas is again supplied to the combustion process of the radiant heat source.
  • a high residual oxygen content available which can be used in a re-combustion.
  • pollutants sometimes contained in the exhaust gas are reduced by the re-combustion, so that the resulting in the thermal treatment with the furnace system according to the invention pollutants and exhaust emissions compared to a conventional radiant heat source can be significantly reduced.
  • a cleaning device is furthermore arranged in the exhaust gas duct, in particular the cleaning device is a catalyst or else a separating device.
  • a heat exchanger is further arranged on the suction device, wherein the exhaust gas is passed through the heat exchanger and either another production process can be fed or else by means of the heat of the exhaust gas, the cooling medium of the cooling plates is temperature controlled.
  • a measuring sensor is preferably arranged in the exhaust gas duct, wherein the combustion process of the radiant heat source can be controlled or controlled as a function of the exhaust gas temperature and / or the exhaust gas consistency, that is to say the stoichiometric composition of the exhaust gas.
  • This makes it possible, for example, by supplying fossil fuel, combustion air from the environment or else additional oxygen enrichment of the combustion air to produce a respectively effective and efficient combustion efficiency.
  • the radiant heat source to operate efficiency optimized in almost all operating points, which reduces the production costs for heating on the one hand due to the efficiency-optimized operation of the radiant heat source, on the other hand because of the ability to shut down the radiant heat source, for example, during a feed operation to a minimum operation or off. Overall, this reduces the production costs of a component tempered according to the invention.
  • Another component of the present invention is a method for operating a furnace installation according to the invention, wherein the furnace installation has at least one of the aforementioned features.
  • the method is characterized in that the board is conveyed in the horizontal direction in the furnace and is then raised by the lifting device, the board below the cooling plates to the plant and then by means of radiant heat in a first range to at least AC3 temperature is heated or maintained in the case of a preheated board at least AC3 temperature and is heated in a second area to a temperature below AC3 or cooled in the case of a preheated temperature to a temperature below AC3 and then lowered the board and removed from the furnace becomes.
  • the printed circuit board is preferably placed in the furnace installation by a manipulator or the board is conveyed via a conveying device, in particular via slide rails or rollers, into the furnace installation. Thereafter, the board is placed within the furnace, where the placement process may directly follow the transfer process or the transfer operation is completed with the placement process. The board is then lifted by the lifting device and brought to the cooling plates.
  • the method according to the invention it is also possible in the method according to the invention not to raise the board, but to lower the cooling plates.
  • the radiant heat source is lowered, so that an effective utilization of the heat radiation while avoiding too large heat radiation losses is utilized.
  • the burner output of the radiant heat source is also switched off during a charging process of the furnace installation or shut down to a minimum operation.
  • the exhausted air from the furnace in particular the extracted exhaust gas is checked for its stoichiometric consistency and depending on the radiant heat source is controlled or controlled.
  • the exhausted air from the furnace in particular the extracted exhaust gas is checked for its stoichiometric consistency and depending on the radiant heat source is controlled or controlled.
  • the exhausted air from the furnace in particular the extracted exhaust gas is checked for its stoichiometric consistency and depending on the radiant heat source is controlled or controlled.
  • the present invention further relates to a furnace for the thermal treatment of metallic components by means of radiant heat, wherein at least two regions of the metallic component are heat treated at different temperatures is characterized in that in a first temperature zone, a heat source is provided, so that a first region of the component can be heated to a temperature of at least AC3 and / or durable at a temperature of at least AC3 and that in a second temperature zone, an air flow is recirculatable, wherein the air flow has a temperature below the AC3 temperature, wherein both temperature zones are separated from each other by a separating device and in the second temperature zone, a second region of the component can be arranged.
  • a heat source is used for temperature control of the first area, which may be formed as a radiant heat source or as a conductive heat source.
  • inductive heating via the heat source is possible.
  • a radiant heat source is used, and then the invention will be described with the radiant heat source.
  • the present invention relates to a furnace, which is encapsulated with respect to the environment, thus having outer walls that separate an inner heating chamber of the furnace relative to the atmosphere or environment.
  • a radiant heat source is arranged, which ensures in a first temperature zone of the furnace system, that a temperature above AC3 prevails.
  • a temperature in the first temperature zone is provided by the radiant heat source, depending on the heat treatment alloy composition of the metallic component, in particular a hardenable steel component in the form of a board or a semi-finished, in Substantially more than 830 ° C, preferably more than 900 ° C. It is particularly possible for the temperature to be between 910 ° and 1000 ° C.
  • the temperature in the first temperature zone is significantly in the incident angle range of the radiant heat.
  • the remaining zone area may have a lower temperature.
  • an air flow is then circulated, the air flow having a temperature below AC3, in particular below AC1, of the respective steel alloy to be treated thermally.
  • An air flow is to be understood as meaning a gaseous flow which, as a consistency, may have ambient air or else a different chemical composition.
  • the temperature of the second temperature zone is in particular between 100 ° C. and 900 ° C.
  • the furnace installation according to the invention therefore does not require any long preheating times of several hours, but is within Ready for use within a few minutes and can immediately work with high efficiency.
  • the separation device is designed as a bulkhead, wherein the two temperature zones are sealed off from each other by the bulkhead, wherein the bulkhead in particular rests positively on the component or a minimum distance between the bulkhead and the component, wherein the bulkhead is interchangeable, so that adapted to the component different bulkheads are used in the furnace plant.
  • the bulkhead in particular rests positively on the component or a minimum distance between the bulkhead and the component, wherein the bulkhead is interchangeable, so that adapted to the component different bulkheads are used in the furnace plant.
  • the bulkhead is significantly on the surface of the component board.
  • a slight gap in the form of a gap in particular a gap of 0.1 mm to 50 mm, most preferably between 0.2 mm and 20 mm, remains.
  • the gap in the form of the gap can also be used as a control parameter to control the gas flow temperature in the second temperature zone or regulate. The height of the gap causes more or less heat to pass from the first zone to the second zone, which then affects the temperature in the second zone.
  • the separating device is designed as a diaphragm, wherein the diaphragm covers the second region of the metallic component at least in sections, so that the second region is shielded from the radiant heat source.
  • the separation device is also arranged in this embodiment as a physically or mechanically present separation device within the furnace, which decisively shielded from the radiant heat radiation radiant heat is shielded by the diaphragm and thus oriented from the direction of the radiant heat source coming radiant heat from lying below the diaphragm areas, thus second Areas, shields.
  • an air flow is, as it were, again circulated in the second region.
  • the air flow then at least partly also passes into the region of the first type.
  • the diaphragm and the bulkhead so that on the one hand, the radiant heat is shielded locally, but on the other hand, the circulated air flow can be sealed by approximately form-fitting contact with the metallic component to be thermally treated , This makes it possible to set very small second regions even within the first temperature zone, which are delimited by the bulkhead.
  • the separation device is further preferably designed to be movable in the furnace system, in particular the separation device is designed as a cover.
  • the separating device is thus in the form of a cover or in the form of a cheese bell over at least a portion of the first kind stülpbar, in which case a first temperature zone above AC3 is adjustable in the area of the first kind.
  • a radiation heat source which may, for example, also be designed as a cover of the cover hood, is then arranged within the cover hood, wherein a temperature is then generated by the radiant heat source on the component to be thermally treated above AC3 inside the cover hood.
  • the second region of the metallic component in the second temperature zone, can be tempered by convection, in particular by convection on a front side and / or on a rear side of the metallic component, wherein the metallic component can be heated by convection or in an already heated one metallic component of the second area by the convection at the front and / or back is coolable.
  • the metallic component is thus stored in particular in the second region such that it can be overflowed on one side at the front side or at the rear side by the air stream or, alternatively, the air stream can be overflowed on both sides. This makes it possible to heat the component to a temperature below the AC3 temperature, in particular below the AC1 temperature, or at a preheated metallic component from a temperature above the AC3 temperature to a temperature below the AC3 temperature slowly, above the critical cooling rate to cool.
  • the radiant heat source is designed as a burner for fossil fuels, in particular as a gas burner, wherein the radiant heat source is disposed in an interior, in particular directly adjacent to the first region.
  • the radiant heat source is preferably designed as a gas burner which burns fossil fuels, for example gaseous or liquid fuels. The gas burner is thus immediately ready for use within a very short time and requires no long lead time to reach the desired operating temperature first.
  • the radiant heat source is designed as a radiant heater.
  • the radiant heat source is particularly preferably arranged such that it is arranged within the first temperature zone, wherein the radiant heat source is furthermore preferably arranged in direct proximity to the first region of the metallic component.
  • a radiant heat burner is also particularly error-prone and at the same time allows heating in the direction of radiation to the temperatures above AC3, the temperatures in the rest of the furnace, especially within the interior or boiler room, inevitably not take temperatures above AC3.
  • the ambient temperature within the furnace is sometimes 50 ° or even 100 ° lower, which is why the other arranged in the furnace bulkheads or hoods are not exposed to such strong thermal loads, as is the case solely due to the heat radiation in the component to be thermally treated.
  • radiation heat sources can preferably be arranged on the front side and / or the rear side of the metallic component within the scope of the invention. So they can be arranged in a furnace plant cover and / or bottom side or also freely and modularly positionable in the furnace or be applied. In the context of the invention, it is thus possible depending on the metallic component to be heated, an efficient heating by the radiant heat sources manufacture. For example, it is possible with boards of only a few millimeters, with only a one-sided radiant heat source in an efficient and fast way to heat the board to the desired temperature or to keep it at this temperature. For boards that sometimes have thicknesses of several centimeters, it is more efficient to heat the board directly on both sides.
  • the metallic component is particularly preferably mounted on a carrier device within the furnace system, the carrier device being designed in particular as an insulating layer and being arranged on the side of the metallic component opposite the radiant heat source.
  • the carrier device may also be a roller device or else a grid-like grate on which the metallic circuit board is placed.
  • the separating device is particularly preferably designed to be thermally insulated, in particular as a hollow component and / or a multilayer sandwich component.
  • the mechanically formed separating device is thus designed as a two-layered mechanical component, in particular of a metallic material or even of a ceramic material or of a mixture of the aforementioned materials, such that between two layers an air layer or a vacuum layer is arranged, wherein the air layer in particular makes the thermal insulation.
  • the separation device it is also possible to form the separation device as a multilayer sandwich component, such that, for example, between two outer layers, a middle insulation layer is formed from an insulating material.
  • the separating device is porous, so that heat of the first temperature zone can pass into the second temperature zone.
  • the second temperature zone can be heated without being here an additional second heat source is to be arranged.
  • a perforated separating device is to be understood as a perforated or perforated mechanical separating device.
  • the higher temperature formed in the first temperature zone can thus pass from this to the second temperature zone, in which a low temperature prevails.
  • This is supported depending on the flow control of the circulating in the second temperature zone air flow, which produces a suction effect on the perforated or on the porous separator so that sometimes active heat is sucked from the first temperature zone to heat the second temperature zone.
  • the air flow in the second temperature zone is generated by a circulating device arranged in the temperature zone and / or the air flow is conveyed through at least one flow channel connected to the furnace system into the second temperature zone.
  • the air flow is generated by an external circulation device. This makes it possible to arrange the circulating device itself outside the furnace, so that it is not exposed to the strong thermal loads of sometimes up to several 100 ° C directly. On the way of the air flow through the flow channel this is then heated by optional heating elements or due to the previously described embodiment, the air flow is heated by the heat radiation of the first temperature zone with.
  • the air flow is selectively adjustable in its temperature by means of a heat exchanger and / or a heat source arranged in the air flow.
  • a heat exchanger and / or a heat source arranged in the air flow This makes it possible to adjust the air temperature of the air flow in such a targeted manner that due to the air flow, a targeted temperature adjustment within the second region of the component to be thermally treated can be achieved.
  • the air flow is adjusted in its flow rate. This is possible in the context of the invention, for example, by adjusting the intensity of the circulating device. If the circulation device is designed, for example, in the form of a fan or fan, different fan speeds or fan speeds can be set due to a setting of the guide vanes or due to the rotational speed of fan or fan. Overall, the advantage results from the two adjustable parameters, on the one hand, the flow velocity of the air flow, on the other hand, the temperature of the air flow targeted set with the successful thermal treatment by forced convection a temperature in the second regions of the component.
  • cooling devices for the at least partial cooling of at least one selected area in the furnace installation itself.
  • the cooling devices can be designed, for example, in the form of spray nozzles, wherein the cooling devices furthermore carry out a further targeted cooling by means of liquid or gaseous coolant.
  • an area on the component is thermally treated via the cooling, so that in turn of the previously described areas with other areas give each other different thermal properties.
  • a cooling device is provided for cooling the air flow in the second temperature zone.
  • the cooling device can be provided for this purpose in the second temperature zone itself or be arranged outside the furnace. The air flow is thus cooled in the cooling device and then introduced into the second temperature zone or circulated in the second temperature zone and thereby cooled. In this way, the desired temperature can be set specifically within the second temperature zone and optionally cooled relatively quickly.
  • a further component of the present invention is a method for operating a furnace installation having at least one of the abovementioned features, wherein in the method according to the invention the first area of the metallic component is heated to at least AC3 temperature by means of radiant heat and / or its temperature is raised to at least AC3. Temperature is maintained and the second region is cooled by convection from a temperature of at least AC3 temperature to a temperature below the AC3 temperature or that the second region is heated by convection to a temperature below AC3, wherein the resulting different temperature zones by a Separator thermally separated from each other
  • the furnace system for the thermal treatment of metallic components, in particular by means of radiant heat, wherein at least two regions of the metallic component are heat treated at different temperatures is characterized in that in a first temperature zone, a heat source, in particular a radiant heat source is provided so that a first region of the component can be heated to a temperature of at least AC3 and / or durable and that in a second temperature zone, an air flow is recirculatable, wherein the air flow has a temperature below the AC3 temperature, wherein both temperature zones of a separator are delimited from each other.
  • the furnace system is further distinguished by the fact that the separation device is designed as a bulkhead and the two temperature zones from each other, wherein the bulkhead in particular rests positively on the component or between the bulkhead and the component remains a minimum distance, the bulkhead is interchangeable, so that adapted to the component different bulkheads are used in the furnace plant.
  • the kiln plant is further distinguished by the fact that the separating device is designed as a diaphragm and covers the second region at least in sections, so that the second region is shielded from the radiant heat source.
  • the furnace system is further distinguished by the fact that the separation device is designed to be movable in the furnace system, in particular the separation device is designed as a cover.
  • the furnace installation is further distinguished by the fact that in the second temperature zone the second area of the metallic component can be tempered by convection, in particular by convection on a front side and / or a rear side of the metallic component, wherein the metallic component can be heated by convection or at an already heated metallic component of the second region is cooled by convection.
  • the furnace system is further distinguished by the fact that in the second temperature zone baffles for targeted flow control, in particular for flow deflection are arranged.
  • the kiln plant is further distinguished by the fact that the radiant heat source is designed as a burner for fossil fuels, in particular as Gas burner, wherein the radiant heat source in an interior space, in particular directly adjacent to the first region, is arranged, wherein preferably a gas burner gas burner is provided as a gas burner and the jet gas burner is atmospherically separated from the furnace chamber.
  • the radiant heat source is designed as a burner for fossil fuels, in particular as Gas burner, wherein the radiant heat source in an interior space, in particular directly adjacent to the first region, is arranged, wherein preferably a gas burner gas burner is provided as a gas burner and the jet gas burner is atmospherically separated from the furnace chamber.
  • the kiln plant is further distinguished by the fact that the radiant heat source is arranged on the front side and / or the rear side of the metallic component.
  • the furnace system is further distinguished by the fact that the metallic component is mounted on a carrier device within the furnace system, wherein the carrier device is in particular formed as an insulating layer and is arranged on the side opposite the radiant heat source side of the metallic component.
  • the kiln plant is further distinguished by the fact that the separating device is thermally insulated, in particular as a hollow component and / or a multilayer sandwich component.
  • the furnace system is further distinguished by the fact that the separation device is porous, so that heat of the first temperature zone can pass into the second temperature zone.
  • the kiln plant is further distinguished by the fact that the air flow in the second temperature zone can be generated by a circulating device arranged in the temperature zone and / or that the air flow can be conveyed into the second temperature zone by at least one flow channel connected to the kiln plant.
  • the furnace system is further distinguished by the fact that the air flow by means of a heat exchanger and / or arranged in the air flow heat source in its temperature is adjustable, in particular the heat exchanger is designed as a bypass flow exhaust gas heat exchanger, the exhaust gas flow heat exchanger is preferably connected to the exhaust gas stream of the gas burner.
  • the furnace system is further characterized by the fact that the air flow in its flow rate is adjustable.
  • the furnace installation is further distinguished by the fact that the components can be conveyed into the furnace installation essentially in the horizontal direction, wherein the components can be treated in the longitudinal direction and in the transverse direction simultaneously with different temperature zones from each other.
  • the furnace system is further characterized in that in the furnace cooling devices for at least partial cooling of at least one selected area are provided and / or that cooling devices are provided for cooling the air flow for the second temperature zone.
  • the invention relates to a method for operating the aforementioned kiln plant, wherein the method is characterized in that the first region of the metallic component is heated by means of radiant heat to at least AC3 and / or held in its temperature to at least AC3 and that the second region by Convection of a temperature of at least AC3 is cooled to a temperature below AC3 or that the second region is heated by convection to a temperature below AC3, wherein the resulting different temperature zones are thermally separated by a separator from each other.
  • FIG. 1a shows an inventive furnace system 1, wherein in the furnace 1 a radiant heat source 2 is arranged and the radiant heat source 2 comprises a radiant tube 3. From the radiant tube 3 occurs radiant heat 4, wherein in FIG. 1a a charging process of the furnace 1 is shown with a board 5 and the radiant heat 4 was significantly reduced.
  • the board 5 has been placed on a platinum support 6 and conveyed in the horizontal direction H in the furnace 1 and can be brought out of the furnace 1 after completion of the tempering in the horizontal direction H again.
  • a configuration is also possible, so that only one opening for access and exit of the board 5 is formed, so that passage losses are prevented.
  • the platinum carrier 6 itself is formed from a carrier plate 7 and an insulating layer 8 arranged on the carrier plate 7.
  • the insulating layer 8 itself has separating layers 9 oriented in the vertical direction V, the separating layers 9 being arranged between second regions 10 and a first region 11 on the circuit board 5. In this case, the separating layers 9 prevent heat conduction from the first region 11 into the second region 10.
  • a temperature sensor is furthermore preferably arranged on the underside of the printed circuit board 5, wherein the temperature sensor is in particular in direct abutting contact with the underside.
  • cooling plates 14 are arranged between a circuit board upper side 13 and the radiant heat source 2, cooling channels 15 extending in the cooling plates 14.
  • FIG. 1b the board 5 has been raised together with the platinum carrier 6 in the lifting direction 16 by a lifting device, not shown, so that the board top 13 comes with a cooling side 17 of the cooling plates 14 in the second areas 10 to the plant and there takes place a conductive heat transfer.
  • a component temperature of the board 5 of at least AC3 temperature is produced or maintained by means of radiant heat 4 of the radiant tube 3.
  • the radiant tube 3 is opposite to FIG. 1a went into a warming operation, which is why significantly more heating energy in the form of radiant heat from the radiant tube 3 emerges.
  • FIG. 2a shows an analogue construction FIG. 1b
  • the cooling plate 14 itself is shielded from the radiant heat 4 of the radiant tube 3 and this is not directly exposed, so that the cooling plate 14 is not increased by the radiant heat. 4 with heated.
  • a cooling plate temperature sensor 19 is arranged in the cooling plate 14, wherein the temperature which is established in the cooling plate 14 and / or on the surface of the circuit board 5 is monitored with the aid of the cooling plate temperature sensor 19.
  • FIG. 2b again shows an analogous structure FIG. 2a
  • the cooling plates 14 have cooling channels 15 for active cooling and / or active temperature adjustment of the cooling plates 14.
  • cooling plate insulation layers 18 are arranged between the cooling plate 14 and the radiant tube 3, so that the cooling plate 14 heats up only insignificantly as a result of the heat effect of the radiant heat 4.
  • FIG. 3a and b again show an analog structure of a furnace 1 according to FIG. 1b ,
  • 14 relative to the vertical direction V between the radiant tube 3 and the cooling plates 14 panels 20 are arranged.
  • aperture 20 are pivotally mounted so that they can be pivoted at any angle ⁇ above the cooling plates 14.
  • the diaphragms 20 are then arranged between the cooling plates 14 and the radiant tube 3, so that they shield the cooling plates 14 from the radiant heat 4.
  • the panels 20 according to FIG. 3b are formed displaceable in the horizontal direction H, so that they can also be arranged between the radiant tube 3 and the cooling plates 14, so that the cooling plates 14 are shielded from the radiant heat 4. This results in a possibility of controlling or regulating the acting heat radiation on the cooling plates, which in turn the temperature of the cooling plates is controllable or regulated.
  • FIGS. 4a and b Again, another alternative of the present invention is shown.
  • This is in accordance with FIG. 4a a board 5 placed on a located in the furnace 1 platinum carrier 6, wherein the platinum carrier 6 is again formed by an insulating layer 8 and a support plate 7.
  • the board 5 can be placed for example by a manipulator on the insulating layer 8.
  • the emitted radiant heat 4 of the radiant tube 3 is reduced so that no unnecessary energy is consumed.
  • the component temperature is measured by a non-tactile temperature sensor 21 on the board surface 13.
  • the board 5 is in accordance with FIG.
  • Cooling plates 14 are also movable in the vertical direction V, so that they come on both sides of the respective board surfaces to the plant.
  • FIG. 5a and b each show a control loop, on the one hand for the board cooling, on the other hand for the Abgasabsaugvorraum.
  • the radiant tube 3 is supplied on the one hand with fuel 23, on the other hand with fresh air 24 sucked from the environment. Both components can be controlled by valves 25 or controlled.
  • the cooling plates 14 themselves are connected with their cooling channels 15 to a cooling circuit 27, wherein the cooling circuit 27 via feed and discharge channels 28, 29 has.
  • a cooling medium 30 may for example be provided in a reservoir 31 and then circulated in the cooling circuit 27 via the supply and discharge channels 28, 29 through the cooling channels 15 of the cooling plates 14.
  • the temperature of the cooling plates 14 is adjustable, which can be carried out, for example, by means of a cooling plate temperature sensor 19 such that the cooling plate 14 itself is monitored.
  • the signal of the cooling plate temperature sensor 19 can then be forwarded to an evaluation unit 32, wherein the evaluation unit 32 can then control a further valve 25 in the cooling circuit 27 or else, for example, can influence the temperature of the cooling medium 30 or influence the flow velocity of the cooling medium 30.
  • a further temperature sensor 33 is arranged in the discharge channel 29, with which the temperature of the emerging from the cooling plate 14 cooling medium 30 can be measured.
  • a heat exchanger 34 is integrated, wherein the heat exchanger 34 is heated either by an external heat source or by the in FIG. 5b exhausted exhaust A.
  • FIG. 5b again shows a control circuit with which it is possible to suck via a suction device 35 located in the furnace 1 exhaust gas A and check by means of a sensor 36 to its stoichiometric composition and / or to its temperature.
  • the sensor 36 may be followed by a cleaning device 37, which deposits pollutants from the exhaust gas A, for example.
  • the exhaust gas A itself is then again the combustion within the heat radiation tube 3 for producing the heat radiation 4, a return possible.
  • the radiant tube 3 fuel 23 is supplied and fresh air 24, which in turn can be mixed via a valve 25 with the exhaust gas A or only fresh air 24 to the radiant tube 3 can be fed. This is dependent on the respective heat requirement as well as on the consistency and temperature of the exhaust gas A. It is also possible to temper the cooling liquid of the cooling plates with the aid of an exhaust gas heat exchanger and / or preheat the fresh air or the fuel gas sucked in for combustion.
  • a heat exchanger 34 is disposed in the exhaust gas recirculation passage 38, wherein the heat exchanger 34 for controlling the temperature of the cooling circuit 27 according to FIG. 5a is usable or even the exhaust gas A withdrawn heat to another production process can perform.
  • the process is either also controllable via an evaluation unit 32 or else also controllable via this.
  • interior temperature sensors 39 as well as non-tactile temperature sensors 21 can be used for this in order to obtain a respective inference to the component temperatures of the circuit board 5 to be thermally treated in the individual regions 10, 11.
  • FIG. 6 shows a furnace installation 101 according to the invention, wherein in the furnace installation 101 a radiant heat source 102 is arranged.
  • the radiant heat source 102 is surrounded by a cover hood 103, so that the radiant heat 104 is conducted onto a circuit board 105 located in the furnace installation 101.
  • a first temperature zone 106 is formed in a space within the cover 103, the first temperature zone 106 heating a first region 107 of the metallic component.
  • a gap 109 is formed, so that the cover 103 does not rest directly on the board 105.
  • the circuit board 105 itself in turn rests on a carrier device 110, whereby an insulating layer 111 is still arranged between the carrier device 110 and the circuit board 105.
  • the insulating layer 111 ensures that within the first temperature zone 106 by means of radiant heat 104 introduced into the first region 107 of the board 105 heat does not exit on the back 112 of the board 105 again.
  • a second temperature zone 113 wherein in the second temperature zone 113, an air flow L is recirculated.
  • circulation devices 114 are arranged directly within the second temperature zone 113.
  • the circuit board 105 protrudes beyond the covering hood 103 and protrudes into the second temperature zone 113 with a respectively formed second region 115.
  • the second area 115 is heated within the second temperature zone 113 to a temperature different from the first area 107 or cooled at a preheated temperature of the board 105.
  • this is done by the recirculated in the second temperature zone 113 airflow L and the associated forced convection at the front 108 and / or the back 112 of the board 105.
  • FIG. 7 shows a further embodiment analogous to FIG. 6
  • side slats 116 are arranged, wherein the lamellae 116 in the vertical direction V change in length, so that, for example, the cover 103 is fully lowered to the front 108 of the board 105 and then no more gap 109 between Front 108 and end of a lamination plate 117 is formed so that the fin plate 116 rests completely on the front 108.
  • lateral sealing bulkheads 118 are shown, which prevent the airflow L generated in the second temperature zone 113 from penetrating onto the underside of the board 105. This results in a third temperature zone 119 below the board 105.
  • FIG. 8 shows a further embodiment of the furnace installation 101 according to the invention, wherein in turn a cover 103 is formed with a radiant heat source 102 therein, wherein the lateral legs 120 of the cover 103 are formed porous and having a perforation 121 shown here.
  • the radiation heat 104 it is thus possible for the radiation heat 104 to pass through the perforation 121, shown on the right-hand side, and, on the other hand, on the left-hand side of the image, due to the air flow L, a suction effect arise, which draws the heated temperature within the first temperature zone 106 in the second temperature zone 113.
  • cooling devices 122 are shown which ensure at the ends 117 of the cover 103 that a clear separation of the circuit board 105 from the first region 107 and the second region 115 remains. It is thus not possible for the component heat to be transferred from the first region 107 to the second region 115 due to heat conduction within the component.
  • Strömungsleitbleche 123 the air flow L conduct such or divert that he not only on a front side 108, but also on the back 112 of the board 105.
  • both the front surface 108 and the back surface 112 in the second region 115 are thermally treated with the temperature of the second temperature zone 113 due to forced convection.
  • FIG. 4 shows a fourth embodiment variant of the present invention, wherein separating devices in the form of diaphragms 124 are also arranged here within a furnace installation 101, the diaphragms 124 shielding the second areas 115 from the radiant heat 104.
  • the radiant heat 104 thus strikes only the first area 107 of the board 105, whereas a second area 115 is shielded from the radiant heat due to the shutters 124.
  • an air flow L circulates within the furnace 101, wherein the air flow L ensures that the areas of the second type are 115 overflowed by the air flow L.
  • FIG. 9 Furthermore shown in FIG. 9 is an optional flow channel 125 through which an external air flow 126 can be conveyed into the furnace 101.
  • the external air flow 126 may already be preheated, so that it warms up the interior of the furnace installation 101.
  • the in FIG. 9 illustrated flow channel 125 with the external air flow 126 can also on all other embodiments according to FIGS. 6 to 8 be connected to the furnace 101.

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Claims (16)

  1. Four (1) destiné au traitement thermique de flans ou produits semi-finis métalliques (5), en particulier de flans revêtus (5) en un alliage d'acier apte à la trempe, au moyen d'une chaleur rayonnante (4), dans lequel au moins deux zones (10, 11) du flan (5) sont soumises à un traitement thermique à des températures de pièce différentes l'une de l'autre, caractérisé en ce qu'une première zone (11) du flan (5) peut être amenée au moins à la température AC3 par une source de chaleur rayonnante (2) et une deuxième zone (10) du flan (5) peut être amenée à une température inférieure à la température AC3 par conduction, dans lequel des plaques de refroidissement (14) sont agencées dans le four (1) pour le traitement thermique conductif des deuxièmes zones (10) et un dispositif de levage (16) pour soulever le flan (5) est prévu ou les plaques de refroidissement (14) dans le four (1) sont déplaçables.
  2. Four selon la revendication 1, caractérisé en ce que le flan (5) dans le four (1) peut être chauffé dans les au moins deux plages de température différentes l'une de l'autre ou en ce qu'un flan (5) chauffé au moins à la température AC3 dans une première zone (11) est maintenu au moins à la température AC3, le flan (5) pouvant être refroidi par conduction à une température inférieure à la température AC3, en particulier inférieure à la température AC1, dans une deuxième zone (10).
  3. Four selon la revendication 1 ou 2, caractérisé en ce que la source de chaleur rayonnante (2) est réalisée sous la forme d'un brûleur à gaz, la source de chaleur rayonnante (2) étant réalisée en particulier sous la forme d'au moins un tube chauffant à rayon (3), dans lequel en outre et de préférence au moins un tube chauffant à rayon (3) est agencé près d'une face supérieure (13) du flan (5) et/ou un tube chauffant à rayon est agencé près d'une face inférieure (22) du flan (5).
  4. Four selon l'une quelconque des revendications 1 à 3, caractérisé en ce que des éléments de protection qui protègent le flan (5) de la chaleur rayonnante (4) ou qui conduisent au flan (5) ladite chaleur rayonnante sont agencés dans un espace de chauffage du four (1).
  5. Four selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le flan (5) peut être logé sur une couche isolante (8) à l'intérieur du four (1), le flan (5) pouvant en particulier être soulevé avec la couche isolante (8), lequel flan (5) repose de préférence au moins par endroits sur la couche isolante (8).
  6. Four selon la revendication 5, caractérisé en ce que des couches de séparation (9) sont agencées dans la couche isolante (8), lesquelles couches de séparation (9) sont orientées verticalement et s'étendent, de manière correspondante aux au moins deux zones de température du flan (5) différentes l'une de l'autre, le long d'une zone de transition.
  7. Four selon l'une quelconque des revendications 5 ou 6, caractérisé en ce que la couche isolante (8) est réalisée sous la forme d'un support de flan (6), lequel flan (5) peut être introduit dans le four (1) et sorti de celui-ci conjointement au support de flan (6) alors qu'il repose sur le support de flan (6).
  8. Four selon l'une quelconque des revendications 1 à 7, caractérisé en ce que les plaques de refroidissement (14) sont agencées entre le flan (5) et la source de chaleur rayonnante (2).
  9. Four selon l'une quelconque des revendications 1 à 8, caractérisé en ce que les plaques de refroidissement (14) sont revêtues et/ou en ce que les plaques de refroidissement (14) peuvent être refroidies de manière active, un fluide de refroidissement (30) pouvant être conduit à travers les plaques de refroidissement (14), ou en ce que les plaques de refroidissement (14) sont isolées du rayonnement thermique, une isolation de plaque de refroidissement étant agencé en particulier entre plaque de refroidissement (14) et source de chaleur rayonnante (2).
  10. Four selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'un capteur de température (21) surveille la température de plaque de refroidissement et la puissance de refroidissement du fluide de refroidissement (30) peut être régulée ou commandée en fonction du signal de température mesuré.
  11. Four selon l'une quelconque des revendications 5 à 10, caractérisé en ce que des plaques de refroidissement (14) agencées au-dessus du flan (5) sont agencées entre la surface de flan (13) et la source de chaleur rayonnante (2) et/ou en ce que des plaques de refroidissement (14) agencées au-dessous du flan (5) sont intégrées dans la couche isolante (8) ou passent à travers la couche isolante.
  12. Four selon l'une quelconque des revendications 1 à 11, caractérisé en ce que dans le four (1) est agencé au moins un capteur de température (21) qui effectue une mesure de température non tactile, lequel capteur de température (21) mesure au moins une température de pièce du flan (5), en particulier d'une zone.
  13. Four selon l'une quelconque des revendications 1 à 12, caractérisé en ce qu'un dispositif aspirateur de gaz d'échappement (35) est raccordé au four (1) de sorte que du gaz d'échappement (A) produit lors de la combustion de la source de chaleur rayonnante (2) peut être aspiré hors de l'espace de chauffage.
  14. Four selon la revendication 13, caractérisé en ce que le gaz d'échappement (A) aspiré peut être réintroduit dans le processus de combustion.
  15. Four selon l'une quelconque des revendications 13 à 14, caractérisé en ce que le gaz d'échappement (A) peut être conduit à travers un échangeur de chaleur, dans lequel, dans l'échangeur de chaleur, de l'énergie thermique tirée du gaz d'échappement (A) peut être amenée au fluide de refroidissement (30) et/ou l'air frais et/ou le gaz de combustion (23) peuvent être chauffés.
  16. Procédé de fonctionnement d'un four (1) selon au moins la revendication 1, caractérisé en ce que le flan (5) est transporté en direction horizontale (H) dans le four (1) puis est soulevé par un dispositif de levage (16), dans lequel le flan (5) vient en appui au-dessous des plaques de refroidissement (14) ou en ce que les plaques de refroidissement (14) sont abaissées sur le flan (5) puis, au moyen d'une chaleur rayonnante (4), le flan dans une première zone (11) est chauffé au moins à la température AC3 ou est maintenu au moins à la température AC3 et le flan dans une deuxième zone (10) est chauffé à une température inférieure à la température AC3 ou est refroidi en dessous de la température AC3 puis le flan (5) est abaissé ou les plaques de refroidissement (14) sont soulevées et le flan (5) est sorti du four (1).
EP13157845.2A 2012-03-15 2013-03-05 Installation de four et procédé de fonctionnement de l'installation de four Active EP2639536B8 (fr)

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DE102012102193.7A DE102012102193B4 (de) 2012-03-15 2012-03-15 Ofenanlage sowie Verfahren zum Betreiben der Ofenanlage
DE201210102194 DE102012102194A1 (de) 2012-03-15 2012-03-15 Ofenanlage sowie Verfahren zum Betreiben der Ofenanlage

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EP2639536A3 EP2639536A3 (fr) 2015-08-26
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US11781198B2 (en) 2016-12-07 2023-10-10 Ebner Industrieofenbau Gmbh Temperature control device for the temperature control of a component

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DE102012016075B4 (de) * 2012-06-22 2014-02-27 Steinhoff & Braun's Gmbh Verfahren und Vorrichtung zur Herstellung eines Metallbauteils
DE102018103143A1 (de) * 2018-02-13 2019-08-14 GEDIA Gebrüder Dingerkus GmbH Vorrichtung zur Herstellung eines Metallbauteiles
DE102021124531B4 (de) * 2021-09-22 2024-01-18 GEDIA Gebrüder Dingerkus GmbH Verfahren zur Herstellung eines Metallbauteils mit Bereichen unterschiedlicher Festigkeit

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EP2497840A1 (fr) * 2011-03-10 2012-09-12 Schwartz, Eva Système de four pour le réchauffage partiel d'ébauches métalliques

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DE10256621B3 (de) * 2002-12-03 2004-04-15 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Formbauteils mit mindestens zwei Gefügebereichen unterschiedlicher Duktilität und Durchlaufofen hierfür
DE102007012180B3 (de) 2007-03-14 2008-06-05 Andreas Breloer Verfahren zur Wärmebehandlung von Halbzeugen aus Metall
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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EP2497840A1 (fr) * 2011-03-10 2012-09-12 Schwartz, Eva Système de four pour le réchauffage partiel d'ébauches métalliques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11781198B2 (en) 2016-12-07 2023-10-10 Ebner Industrieofenbau Gmbh Temperature control device for the temperature control of a component

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EP2639536A3 (fr) 2015-08-26
EP2639536B8 (fr) 2019-06-26

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