Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/18—Hardening; Quenching with or without subsequent tempering
  • C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
  • C21D9/0056—Furnaces through which the charge is moved in a horizontal straight path
• • 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
  • 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
  • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
• • 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
  • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
  • F27B9/40—Arrangements of controlling or monitoring 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
  • C21D2221/00—Treating localised areas of an article
• • 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

Definitions

• the invention relates to a method and a device for the thermal treatment of a component, in particular a steel component for a motor vehicle.
• steel components such as B-pillars are thermally treated differently in areas.
• there is a different ductility in certain areas which is advantageous for the crash behavior of such components.
• occupants can be protected by a hard area of the B-pillar at seat height, while soft areas in the upper and lower areas of the B-pillar absorb energy through deformation.
• the object of the present invention is to present, on the basis of the prior art described, a method for the thermal treatment of components with which areas of the component can be thermally treated with particularly sharp separation from one another.
• a corresponding device will be presented.
• the method comprises: a) heating the component in a first continuous furnace, which is divided in the transport direction of the component into a first zone and a second zone adjoining this and later traversed by the component, the first zone extending over in the transport direction of the component at least 70% of the first continuous furnace extends, wherein an average temperature in the first zone is below half the AC3 temperature of the component, and wherein an average temperature in the second zone is above the AC3 temperature of the component, b) transferring the component from the first continuous furnace in a temperature control station, c) thermal treatment of the component in the temperature control station, a first area of the component being exposed to a temperature that is on average above the AC3 temperature of the component, and a second area of the component is cooled.
• a component can be thermally treated with the method described.
• the component is preferably a steel component.
• the steel is preferably 22MnB5.
• a component for a motor vehicle, in particular a B-pillar can be thermally treated with the method described.
• the component is preferably press-hardened in a press and, to that extent, hot-formed.
• the method preferably includes as a further step that the component is transferred to a press after the thermal treatment and is press-hardened there.
• the method described is a method for thermal treatment and press hardening of a construction part.
• the component preferably has a material thickness of at least 1 mm, in particular special in the range of 1 to 4 mm.
• the material thickness of the component is preferably constant over the entire component.
• the component can also have a different material thickness in certain areas.
• the component can be a "Tailor Rolled Blank (TRB)", in which locally different material thicknesses are obtained by locally different rolling.
• the component can also be a "Tailor Welded Blank (TWB)", in which locally un different material thicknesses are obtained by welding several sheets together.
• TRB Trim Rolled Blank
• TWB Teilor Welded Blank
• the method can be applied equally to components with and without a coating.
• an Al / Si coating can be considered as the coating.
• step a) the component is heated in the first continuous furnace.
• a furnace is to be understood as a device which is brought to an adjustable temperature inside and into which a component can be introduced. Over time, the component adopts the temperature inside the furnace. The heat is therefore from the gas in the furnace, which is in particular air can be transferred to the component.
• a continuous furnace is a furnace through which the component can be moved, with the component being heated as it passes through the furnace.
• the first continuous oven is preferably a roller oven.
• the component is preferably heated by burners, in particular gas burners. This allows the component to have a particularly evenly distributed temperature. In particular, not only one layer on the surface of the component is heated. The entire component is heated in the first continuous furnace. The component is completely taken up by the first continuous furnace. In addition, heating by a particularly large temperature difference can be achieved with a continuous furnace. With a continuous furnace, a component can in particular be heated from room temperature to a temperature in the range of the component's AC3 temperature. Such extensive heating is not possible with many other heating methods, or at least not without a disproportionately large effort.
• Heating in a continuous furnace is in particular in contrast to heating by so-called “direct energization". This would make it difficult to heat the component uniformly and by a sufficiently high amount
• direct energization requires contact with the component.
• the heating is preferably carried out without contact The heating is contactless if the heat input into the component takes place via gas and / or via thermal radiation.
• the first continuous furnace and also the rest of the device used for the method are described with the aid of a "transport direction of the component". This is the direction in which the component is moved through the device and its elements.
• the transport direction of the component is therefore in particular the direction with which the component is moved through the first continuous furnace.
• the first continuous furnace has a first zone and a second zone.
• the fact that the first continuous furnace is "divided" into these two zones in the transport direction of the component means that the first continuous furnace only has these two zones when viewed along the transport direction of the component.
• the zones preferably each extend across the transport direction of the component the entire first continuous furnace.
• the component first passes through the first zone and then the second zone.
• the second zone When viewed in the direction of transport, the second zone is subordinate to the first zone.
• the first zone and the second zone directly adjoin one another.
• the first zone adjoins an inlet of the first continuous furnace
• the second zone adjoins an outlet of the first continuous furnace.
• the component can be introduced into the first continuous furnace via the inlet.
• the component can leave the first continuous furnace via the outlet.
• the average temperature in the first zone is below the component's AC3 temperature; the average temperature in the second zone is above the AC3 temperature of the component.
• the component is first heated comparatively slowly to a temperature below the AC3 temperature and then briefly exposed to a temperature above the AC3 temperature.
• the component in the second zone is preferably heated to a temperature above the AC3 temperature. If the residence time of the construction part in the second zone is long enough, this can be the temperature set in the second zone.
• the temperatures in the first zone and in the second zone are each constant. This means that the component is heated evenly within the zones. It should be noted, however, that short-term and / or locally limited temperature changes within the first continuous furnace have almost no relevance for heating the component. This is because the temperature of the component adapts comparatively slowly to the temperature in the first continuous furnace.
• the zones are defined by the respective average temperature.
• the average temperature in the first zone is below the AC3 temperature, the average temperature in the second zone above the AC3 temperature.
• the first zone is therefore not interrupted, for example, by the fact that the temperature is in a small range above the AC3 temperature of the component.
• the average temperature is the average temperature to which the component is exposed in the respective zone.
• a component level of the first continuous furnace i.e. the level in which the component is transported through the first continuous furnace.
• locally increased temperatures in the area of the burners should be disregarded if they are spaced from the component.
• the first zone extends in the direction of transport of the component over at least 70% of the first continuous furnace, preferably even over at least 80%. It has been found that it is sufficient if the component is initially warmed up comparatively slowly and then only briefly exposed to a temperature above the AC3 temperature. Accordingly, it is preferred that the first zone is made significantly longer than the second zone. Such heating results in a particularly small transition area between the areas of different ductility. The areas of different ductility are therefore particularly sharply delimited from one another. This is surprising insofar as a connection between the expansion of the transition area and the type and manner of heating prior to setting a temperature above AC3 was not previously known.
• the zones are only delimited by the set temperature.
• a first zone and a second zone can be defined in the first continuous furnace in various ways. It is sufficient if there is a possible assignment of a first zone and a possible assignment of a second zone, with all of the conditions set up for the two zones being met. Alternative allocation options are then irrelevant.
• the zones are preferably not assigned arbitrarily. If the temperature profile shows clearly recognizable jumps along the direction of transport of the component, the boundary between the zones is preferably clear with such a recognizable jump together.
• the temperature at the boundary between the first zone and the second zone is the AC3 temperature of the component. This is particularly the case when the boundary between the two zones is at a temperature jump from a value below the AC3 temperature of the component to a value above the AC3 temperature of the component.
• the temperature over at least 80% of an expansion of the first zone in the direction of transport of the component is below the AC3 temperature of the component.
• the temperature over at least 80% of an expansion of the second zone in the transport direction of the component is above the AC3 temperature of the component.
• the temperature in the entire first zone is particularly preferably below the AC3 temperature.
• the temperature in the entire second zone is particularly preferably above the AC3 temperature.
• the first continuous furnace preferably has a plurality of heating elements, the temperature of which can preferably be set individually.
• the first zone and the second zone preferably correspond to a respective group of the heating elements.
• the assignment of the heating elements to a zone can be done by a control device and in this respect does not have to be recognizable from the heating elements themselves.
• the only decisive factor is the temperature distribution.
• the temperature setting of a heating element at the boundary between the first zone and the second zone the assignment of this heating element can be changed from the first zone to the second zone, and vice versa.
• the expansion of the zones can be changed by changing the assignment of heating elements at the border between the zones.
• the temperature distribution of the zone can be adjusted through the respective temperature setting of the heating elements. All heating elements in a zone are preferably set to the same temperature.
• step b) of the method the component is transferred from the first continuous furnace to the temperature control station. There, the component is thermally treated differently in areas in step c) by applying a first area of the component to a temperature temperature, which is on average above the AC3 temperature of the component, and a second area of the component is cooled.
• the first continuous furnace and the temperature control station are different components that are spatially separated from one another.
• the transfer between the first continuous furnace and the temperature control station facilitates the cooling of the component between the heating in the first continuous furnace and the thermal treatment in the temperature control station.
• the component is cooled down as quickly as possible in certain areas in the temperature control station. Rapid cooling can be carried out more efficiently outside the hot first continuous furnace. In this way, the cooling process can already begin during the transfer.
• the spatial separation of the first pass-through furnace from the temperature control station accelerates the process. This is in contrast to a solution in which all process steps are carried out in the same device without having to transfer the component. Such solutions typically aim to keep the cost of component transfers low or to avoid them altogether.
• the spatial separation between the first continuous furnace and the temperature control station also facilitates the construction because the requirements for the first continuous furnace and the temperature control station are different. Integrating both in one facility would therefore be correspondingly complicated.
• the first area is exposed to a temperature above the AC3 temperature of the component.
• the first area in the temperature control station is preferably heated as a result.
• the first area in the temperature control station can also be kept at its temperature or the cooling of the first area can be slowed down.
• the first area of the component is preferably exposed to a temperature above the AC3 temperature of the component to the extent that the component with the first area is held against a chamber that is open on the component side, the chamber being kept at this temperature via a heating device.
• the heating device is preferably an electrical heating device.
• the heating device can, for example, have a heating element such as a heating loop.
• the heating device comprise a radiant tube which is heated with a burner, in particular with a gas burner.
• the second area is cooled in the temperature control station. This is preferably done in that the second area is held outside the previously described chamber. There, the second area is preferably acted upon with a cooling fluid, in particular with compressed air.
• the compressed air preferably has a pressure in the range from 2 to 4.5 bar. As a result of this comparatively high pressure, a large amount of the compressed air can be directed to the second area of the component within a very short time, so that a sufficiently high cooling speed can be achieved.
• the temperature of the component is above or below the AC3 temperature of the component has a decisive influence on the structure composition obtained.
• the two areas can have different structural compositions and, in this respect, different ductilities.
• the first area will be harder than the second area.
• the crash properties can be set in a targeted manner.
• the first area and the second area are not necessarily related areas.
• a middle part of a B-pillar represents the first area, while an upper and a lower part of the B-pillar together represent the second area.
• the component preferably, but not necessarily, only has the first area and the second area, that is to say no further areas.
• the method further comprises: d) transferring the component from the temperature control station into a second continuous furnace, e) thermal treatment of the component in the second continuous furnace.
• the temperature control station and the second continuous furnace are different components that are spatially separated from each other.
• the transfer between the tempering station and the second continuous furnace facilitates the cooling of the component between the thermal treatment in the tempering station and in the second Conveyor furnace.
• the second area of the construction can also be cooled down during the transfer. This reduces the required size of the temperature control station and speeds up the process. This is in contrast to a solution in which all process steps are carried out, if possible, in the same device without having to transfer the component.
• Such solutions typically aim to keep the expense of component transfers low or to avoid them altogether.
• the spatial separation between the temperature control station and the second continuous furnace also facilitates the construction because the requirements for the temperature control station and the second continuous furnace are different. Integrating both in one facility would therefore be correspondingly complicated.
• the second continuous oven is preferably a roller oven.
• the entire component is thermally treated in the second continuous furnace.
• the component is completely picked up by the second continuous furnace.
• the thermal treatment in a continuous furnace is in particular in contrast to a heating by the so-called "direct energization".
• the thermal treatment in the second continuous furnace gives the component a different structural composition than would otherwise be the case.
• the present embodiment is directed to applications in which corresponding de structural compositions are desired. It has been found that, in particular in these applications, the advantage described is achieved that particularly sharply delimited areas of different ductility can be obtained through the zones with different temperatures in the first continuous furnace. This advantage is achieved in a special way with the combination of steps a) to e).
• the average temperature in the first zone of the first continuous furnace is in the range from 10 to 30 K below the AC3 temperature of the component and / or the average temperature in the second zone of the first continuous furnace is in the range from 10 to 30 K above the component's AC3 temperature.
• the preferred combination is that the average temperature in the first zone of the first continuous furnace is in the range from 10 to 30 K below the AC3 temperature of the component and that the average temperature in the second zone of the first continuous furnace is in the range from 10 to 30 K above the AC3 temperature of the component is.
• the temperature in the first zone is on average 814 to 836 ° C and in the second zone on average 856 to 876 ° C.
• the temperature in the first zone is particularly preferably constant in the range from 816 to 836.degree. C. and in the second zone constant at 856 to 876.degree.
• the residence time of the component in the second zone of the first continuous furnace is in the range from 10 to 30 s.
• the dwell time in the first continuous furnace is preferably in the range from 250 to 400 s. Accordingly, a dwell time in the range from 10 to 30 s in the second zone is comparatively short. However, tests have shown that such a short dwell time in the second zone is sufficient for the advantages described. A longer residence time could have a detrimental effect on the structure composition.
• the cooling of the second area begins in step c) with a delay of 0.5 to 15 s after the end of step b).
• the cooling does not begin immediately after the component has entered the temperature control station.
• the cooling can also be used for cooling through free radiation to the environment, whereby, for example, cooling fluid can be saved.
• the cooling that starts after the delay is active cooling. This allows the strength properties of the component to be set particularly precisely. Tests have shown that a delay that is too long is also disadvantageous and can in particular lead to an enlargement of the transition area between areas of different ductility.
• the combination of the described zone-wise heating in the first continuous furnace with the comparatively low delay showed in tests a particularly sharp separation between the different ductility areas.
• the first area of the component is exposed in step c) to a temperature which is on average 170 to 250 K above the AC3 temperature of the component.
• the temperature control in the temperature control station also has an influence on the expansion of the transition area between the areas of different ductility.
• a comparatively high temperature for the thermal treatment of the first area in the temperature control station resulted in a smaller transition area in tests.
• the component is preferably exposed to a temperature which is constantly in the range from 170 to 250 K above the AC3 temperature of the component.
• a temperature which is constantly in the range from 170 to 250 K above the AC3 temperature of the component.
• the first area in step c) is exposed to an average temperature in the range from 900 to 1100 ° C., in particular a constant temperature in this area.
• the construction part remains in step c) for a dwell time in the range of 10 and 30 s in the temperature control station.
• a device for thermal loading of a component comprises: - A first continuous furnace, which is divided into a first zone in the direction of transport of the component and a second zone adjoining and following this, the first zone extending in the direction of transport of the component over at least 70% of the first continuous furnace,
• control device which is set up to set an average temperature below the AC3 temperature of the component in the first zone of the first continuous furnace and to set an average temperature above the AC3 temperature of the component in the second zone of the first continuous furnace.
• the device is preferably intended and set up for operation in accordance with the method.
• the method is preferably carried out with the device.
• the device preferably has a second continuous furnace, which is arranged downstream of the temperature control station in the transport direction of the component.
• the fact that the second zone of the first continuous furnace is arranged downstream of the first zone in the direction of transport of the component means that the component passes through the second zone later than the first zone.
• Fig. 1 a device according to the invention for the thermal treatment of a
• FIG. 2 a temperature profile which is obtained with the device from FIG. 1 at
• FIG. 1 shows a device 1 for the thermal treatment of a component 2.
• the device 1 comprises a first continuous furnace 3, which has a first zone 6 and a second zone 7 downstream of the first zone 6 in the transport direction of the component 2.
• the second zone 7 is passed through later by the component 2 and is therefore to the right of the first zone 6 in FIG No further zones in the direction of this.
• the first zone 6 extends in the transport direction r of the component 2 over 70% of the first continuous furnace 3.
• the first zone 6 and the second zone 7 extend transversely to the transport direction r - that is, up and down in FIG. 1 and perpendicular to the plane of the drawing - over the entire first continuous furnace 3.
• the device 1 also has a temperature control station 4 arranged downstream of the first continuous furnace 3 in the transport direction r of the component 2. Furthermore, the device 1 has a second continuous furnace 5, which is arranged downstream of the temperature control station 4 in the transport direction r of the construction part 2.
• the temperatures in the first zone 6 of the first continuous furnace 3, in the second zone 7 of the first continuous furnace 3, in the temperature control station 4 and in the second continuous furnace 5 can be set via a control device 8. This is indicated by dotted lines.
• the control device 8 is set up in particular to set an average temperature below the AC3 temperature T A c3 of the component 2 in the first zone 6 of the first continuous furnace 3, and an average temperature above the AC3 temperature in the second zone 7 of the first continuous furnace 3.
• FIG. 2 shows a temperature profile which occurs in the component 2 when it is moved through the device 1 from FIG. 1.
• the representation of Fig. 2 is schematic. A plot of temperature T over time t in any units is shown.
• the component 2 is first heated in the first continuous furnace 3.
• the dwell time of the component 2 in the first continuous furnace 3 is denoted by t Di and divided into the dwell time denoted by t Zi in the first zone 6 and the dwell time denoted by t Z 2 in the second zone 7.
• the temperature is set to a constant value T Z ⁇ , which is below the AC3 temperature T AC 3 of the component 2.
• the second zone 7 the temperature is set to a constant value T Z 2, the is above the AC3 temperature T A c3 of component 2.
• T Z ⁇ which is below the AC3 temperature T AC 3 of the component 2.
• T Z 2 the temperature is set to a constant value T Z 2
• the temperature of the component 2 initially rises to the value T Zi , at which saturation occurs by the end of t Zi.
• the component 2 is then transferred to the temperature control station 4.
• the associated transfer time is denoted by t Ti .
• t Ti The transfer time
• the component 2 cools down.
• T A of a first area of the component and the temperature T B of a second area of the component. This is possible, for example, through different isolation in certain areas during the transfer.
• the component 2 remains in the temperature control station 4 for a dwell time t T s.
• the component 2 is thermally treated in the temperature control station 4 by exposing a first area of the component 2 to a temperature that is constant at a value T TS above the AC3 temperature T A c3 of the component 2 is, and a second loading area of the component 2 is cooled.
• the cooling of the second area of the component 2 begins with a delay t v .
• the delay t v begins when the component 2 enters the temperature control station 4, that is to say at the end of t Ti and the beginning of t T s. Even despite the cooling, an increase in the temperature T B of the second area can be seen. This is due to the release of latent heat. This effect is also referred to as "recalescence".
• the component 2 After the thermal treatment of the component 2 in the temperature control station 4, the component 2 is transferred to the second continuous furnace 5.
• the transfer time for this is denoted by t T 2.
• the component 2 cools down, which can vary depending on the area.
• the component 2 is further thermally treated by heating it as a whole.
• the component 2 is exposed to a temperature which is above the AC3 temperature T AC 3 of the component 2.
• the colder second area of the component 2 is heated to a greater extent than the warmer first area.
• the dwell time of the component 2 in the second continuous furnace 5 is denoted by T D2.
• the construction part 2 Due to the different thermal treatment in areas, the construction part 2 has a different ductility in areas. This is, for example, with a B- Column advantageous for a motor vehicle.
• the different temperatures T Zi , T Z 2 in the zones 6, 7 of the first continuous furnace 3 have the effect that the areas of different ductility are particularly sharply separated from one another.
• TTS temperature for the second area in the temperature control station T A temperature of the first area of the component T B temperature of the second area of the component t time t Di dwell time in the first continuous furnace tzi dwell time in the first zone of the first continuous furnace t Z 2 dwell time in the second zone of the first continuous furnace t Ti Transfer time from the first continuous furnace to the temperature control station t T s Dwell time in the temperature control station t v Delay in the cooling of the second area of the component t T 2 Transfer time from the temperature control station to the second continuous furnace t D2 Dwell time in the second continuous furnace r Transport direction of the component

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Crystallography & Structural Chemistry (AREA)
• Thermal Sciences (AREA)
• Physics & Mathematics (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• General Engineering & Computer Science (AREA)
• Tunnel Furnaces (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Heat Treatment Of Articles (AREA)
• Control Of Heat Treatment Processes (AREA)

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• 2020
  • 2020-03-06 DE DE102020106139.0A patent/DE102020106139A1/de active Pending
• 2021
  • 2021-02-23 CN CN202180019439.7A patent/CN115210388A/zh active Pending
  • 2021-02-23 MX MX2022010937A patent/MX2022010937A/es unknown
  • 2021-02-23 WO PCT/EP2021/054443 patent/WO2021175663A1/de unknown
  • 2021-02-23 EP EP21708181.9A patent/EP4114992A1/de active Pending
  • 2021-02-23 JP JP2022553031A patent/JP2023516732A/ja active Pending

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