EP2427282A2 - Dispositif et procédé pour chauffer des pièces à usiner façonnables à chaud - Google Patents

Dispositif et procédé pour chauffer des pièces à usiner façonnables à chaud

Info

Publication number
EP2427282A2
EP2427282A2 EP10720267A EP10720267A EP2427282A2 EP 2427282 A2 EP2427282 A2 EP 2427282A2 EP 10720267 A EP10720267 A EP 10720267A EP 10720267 A EP10720267 A EP 10720267A EP 2427282 A2 EP2427282 A2 EP 2427282A2
Authority
EP
European Patent Office
Prior art keywords
heat
station
heat station
workpiece
predetermined
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.)
Granted
Application number
EP10720267A
Other languages
German (de)
English (en)
Other versions
EP2427282B1 (fr
Inventor
Manfred Beck
Michael Braun
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.)
Braun Manuela
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP2427282A2 publication Critical patent/EP2427282A2/fr
Application granted granted Critical
Publication of EP2427282B1 publication Critical patent/EP2427282B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • 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
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets

Definitions

  • the invention relates to a device and a method for heating hot to be formed metallic workpieces, for example, sheet metal parts of a vehicle body.
  • the invention has for its object to provide a new improved device and a new improved method for heating hot workpieces to be formed.
  • the solution according to claim 1 provides a heat treatment device, possibly with downstream hot forming device, for example, with a press for metallic workpieces, preferably sheet metal parts of a vehicle body before.
  • This heat treatment device comprises
  • control device for the operation of the transfer device and / or the operation of the heat stations, wherein it is provided
  • the first heat station is designed such that the workpiece accommodated therein or the workpieces received therein can each be heated to a predetermined temperature for the first heat station within a predetermined residence time for the first heat station,
  • the second heat station has more workpiece receiving positions than the first heat station, and is formed such that the workpieces received therein within a predetermined for the second heat station dwell time, which is greater than the predetermined for the first heat station dwell time, one for the second Heat Station predetermined temperature can be heated and / or kept constant at this predetermined temperature, wherein the predetermined for the second heat station temperature is approximately equal to or higher than the predetermined temperature for the first heat station.
  • one or more such first heat stations and one or more such second heat stations may be provided. Furthermore, further heat stations can be connected upstream and / or downstream and optionally interposed.
  • the division into several different heat stations, the apparatus requirement is created to perform the heating of the workpieces in several different heat treatment phases.
  • the different heat treatment phases may be a plurality of heating and / or temperature-preserving phases having preferably different temperatures in the heat stations and preferably different residence time in the heat stations.
  • the heat treatment device according to the invention coated with a surface protection parts can be hot to be formed metallic workpieces, preferably sheet metal parts of a vehicle body.
  • the heat treatment device according to the invention is not limited to these applications.
  • a rapid heating phase is carried out in the first heat station and a diffusion phase in the second heat station.
  • the diffusion phase the diffusion of the coating material into the metallic workpiece takes place at a temperature required for the diffusion.
  • the residence time in the heat station of the diffusion phase is set larger in comparison to the residence time in the upstream rapid heating station.
  • the different stations in conjunction with the different residence times may have a different number of workpiece receiving stations. With the number of workpiece receiving stations in the stations a multiple assignment and thus a parallel treatment of several workpieces in each case a heat station is possible.
  • the second heat station has more workpiece receiving places than the first heat station. This means that in the second heat station, a larger number of workpiece receiving stations is available. It is thus in the second heat station so a parallel treatment of several workpieces simultaneously or at least temporally overlapping possible. However, it is not always used in all versions of the heat treatment process all available workpiece receiving stations, that is occupied with workpieces.
  • the second heat station can effectively form a buffer memory. It is thus possible to provide relatively long residence times of the workpieces in the second heat station and to realize shorter residence times in the upstream and / or downstream heat station, wherein the cycle time can be determined by the shorter residence time, for example by a downstream heat station or the downstream hot forming device ,
  • the removal time of the heated in the stations workpieces can thus be compared to the conventional technique reduced by a multiple and can be tuned, for example, to the cycle time of the forming machine. Due to the inventive concept of the device with the multiple occupancy or parallel heat treatment in the second heat station in conjunction with upstream and downstream heat stations with less number of workpiece receiving stations can be built relatively small and good accessibility and lower maintenance costs can be achieved.
  • the stations of different workpiece holding capacity or different residence time can be advanced and / or downstream of the second heat treatment station.
  • a third heat station is provided downstream of the second heat station, which has fewer workpiece receiving stations than the second heating station and is designed such that the workpiece received therein or the workpieces received therein in each case within a predetermined residence time for the third heat station, which is smaller than the predetermined for the second heat station residence time heated to a predetermined temperature for the third heat station and / or stable to this predetermined temperature is durable, this predetermined temperature is approximately equal to or higher than that predetermined for the second heat station Temperature.
  • One or more such third heat stations may be provided. It is essential that the number of workpiece receiving stations of this third heat station is lower than that of the second heating station. In special embodiments, the number of workpiece receiving stations of the third heat station may be the same as the number of workpiece receiving stations of the first heat station. There are provided embodiments in which the first Heat station and / or the second station each having only one workpiece receiving station.
  • the type of heating equipment in the different heat stations can be different. This substantial advantages can be achieved because depending on the performance of the respective heating device, the number of workpiece receiving stations for the relevant heat station can be selected. It is particularly preferred if in the first heat station, an inductive heating device is present to obtain a particularly rapid heating of the workpieces. It can be provided that the first heat station has a heating device for inductive heating of the workpieces. However, embodiments with conductive heating of the workpieces in the first heat station are also conceivable.
  • the second heat station has a heating device for heating the workpieces by means of fuel combustion and / or by electrical resistance heating. It is also possible to reduce the energy requirement by good insulation of the second heat station. This is of particular advantage in the second heat station, which provides a relatively long residence time.
  • well-insulated termination devices such as end flaps or end covers, are provided which allow the workpieces to be fed and removed but minimize the heat losses during the residence time of the workpieces concerned.
  • the third heat station has at least one heating device for inductive heating of the sheet metal parts.
  • the third heat station may also be provided preferably a zone-wise heating. It can be provided that the third heat station at least two or more similar or different Having heating devices which form two or more zones for the third heat station predetermined temperatures zone by zone.
  • the zones may preferably be provided a separate inductor for adjusting the required different temperature, for. B. temperatures below or above the Austenitmaschinestemperatur of the metallic material. But it is also possible to use the required different temperatures through an inductor with different heat generating zones.
  • a multi-zone hardening can take place. It can be achieved by different heating in the different zones predefined in the different zones strength. Particular advantages arise with the Mehrzonennning adopteden even if the workpieces to be heated in the different zones have different thicknesses.
  • the tuning in the different zones can also be done for material combinations with different melting points and different conductivity in the zones.
  • the heat treatment process may according to claim 27 preferably have the following steps:
  • Step a heating the workpiece over a first period
  • Step b keeping the workpiece warm by thermal insulation and / or
  • Step c further heating the workpiece to a temperature equal to or higher than the austenitizing temperature of the workpiece and maintaining the temperature at least the austenitizing temperature over a third period of time, wherein the duration of step a and the duration of step c are each shorter than the time duration of step b and wherein workpieces which are successively subjected to step a successively or with temporal overlap, then simultaneously, d. H. at least overlapping, subjected to step b and then successively subjected to step c without time overlap.
  • inductive heating of the workpiece may be provided in step a, but it is also possible to provide other heating methods, for example, conductive heating.
  • the heating can be carried out by means of fuel combustion and / or by electrical resistance heating.
  • the heat treatment method may preferably be performed with a heat treatment apparatus having first, second, and third heat stations as described above.
  • a heat treatment apparatus having first, second, and third heat stations as described above.
  • a) transfer of a workpiece to the first heat station b) heating of the workpiece during a predetermined for the first heat station residence time to a predetermined temperature for the first heat station, c) assignment of the positionally adjustable first heat station to a free second workpiece receiving location of the second heat station, d) transfer of the workpiece after the predetermined for the first heat station residence time to the second heat station, e) heating the workpiece to a predetermined temperature for the second heat station and holding this temperature; f) assignment of the positionally adjustable third heat station to an occupied second workpiece receiving location of the second heat station, at which the residence time is greater than or equal to the predetermined for the second heat station residence time, g) transfer of the workpiece to the third heat station, h) heating of the workpiece on the i) positioning the third heat station so that the workpiece can be transferred to the hot-forming device located downstream of the third heat station, j) transfer of the workpiece to the hot-forming device.
  • step h) at least two predetermined for the third heat station temperatures are provided, these two temperatures are assigned to different workpiece sections.
  • austenitic such as austenitic and non-austenitic areas
  • Austenite refers to ⁇ mixed crystals of iron. Austenite is part of many stainless steels. The structure has a low hardness, but can be increased considerably by cold deformation.
  • the temperature or the temperatures in the third heat station is greater than or equal to the austenitizing temperature. It may be provided here that at least one of the temperatures predetermined for the third heat station is less than the austenitizing temperature.
  • the temperature of one of the workpiece sections may, for example, be above the austenitizing temperature, the temperatures in the other workpiece sections may be below the austenitizing temperature, the austenitizing temperature being readable, for example, from the state diagram of the steel alloy from which the Workpiece is formed.
  • the ductile regions of the component produced from the workpiece can deform very plastically when overloaded and are therefore able to absorb impact energy, while the hardened areas contribute to the stability.
  • the components formed in this way are particularly suitable for improving the safety of motor vehicles in rear-end collisions because the ductile regions can act as crumple zones and destroy impact energy through deformation.
  • the residence time predetermined for the second heat station is at least equal to the time in which the diffusion process is completed. It is possible, the residence time in the third heat station the technological requirements and to choose larger ones, whereby the result of the diffusion is not questioned.
  • the cycle time of the hot-forming device is greater than the predetermined for the first heat station residence time and / or the predetermined for the third heat station residence time.
  • the cycle time of the hot-forming apparatus taking into account the transfer time between the third heat station and the hot-forming device and the time for removal of the finished component from the hot-forming device, determines the smallest possible cycle time.
  • the cycle time of the hot forming device is much smaller than the second residence time, provided that the second heat station, which provides a relatively high residence time, has a sufficiently high number of workpiece receiving locations.
  • the predetermined for the first and third heat station residence time are substantially smaller than the predetermined for the second heat station residence time.
  • the residence time predetermined for the second heat station is 4 minutes, that is 240 seconds and the predetermined residence time for the first and third heat stations is 4 seconds each
  • the residence time predetermined for the second heat station is (24074) times, ie 80 times greater than the predetermined for the first heat station residence time. Consequently, the second heat station must have at least 80 second workpiece receiving locations to operate at the same rate as the first thermal station. This very rough estimate does not yet take into account the transfer times between the heat treatment stations.
  • At least one of the heating stations and / or the tool receiving station and / or the tool receiving stations of at least one of the heat stations is / are positionally adjustable.
  • the heat station and / or the workpiece receiving station and / or the workpiece receiving stations is or are positionally adjustable such that at least one workpiece receiving station of the adjustable heat station or the adjustable workpiece receiving station and / or the adjustable workpiece receiving stations can be assigned to a workpiece receiving station of a downstream or upstream heating station is or are for the supply of a workpiece from the upstream heat station or for the removal of a workpiece to the downstream heat station.
  • the workpiece is arranged supported on a movable carrier, which is arranged resting and / or fixed during the residence time of the workpiece in a heat station on the workpiece holder position and during the supply of the workpiece from an upstream heat station or during the discharge of Workpiece to a downstream heat station is movably guided.
  • the movable carrier may be, for example, a trolley on which the workpiece is stored and possibly fixed.
  • the fixing of the workpiece on the workpiece receiving station or the movable carrier is advantageous because otherwise the workpiece could perform uncontrolled movements, such as flutter movements with inductive heating. It is provided in preferred embodiments of heat stations with inductive heating to fix the workpieces on the workpiece receiving stations or the movable carriers. Apart from this, the fixation of the workpieces can advantageously be provided in all versions with movable carriers or positionally adjustable workpiece receiving stations or heat storage stations which can be positioned in order to ensure that the workpieces are securely held in position during the heat treatment or during their transport through the heat treatment device. This is especially true even if the heat station itself is positionally adjustable or has position-adjustable workpiece receiving positions.
  • the positionally adjustable heat station and / or the positionally adjustable workpiece receiving station is adjustable in the vertical direction or is adjustable in the horizontal direction.
  • one or more of the heat stations has vertically above one another or horizontally juxtaposed workpiece receiving positions.
  • Horizontally juxtaposed workpiece receiving stations may be preferred to arrange more than one technological line for heat treatment and hot forming side by side, wherein the below-described embodiment of the second heating station with vertically stacked workpiece receiving stations may be preferred.
  • the second heat station has workpiece receiving stations arranged vertically one above another and the upstream first heating station or the downstream third heating station is positionally adjustable in the vertical direction or has at least one workpiece receiving position adjustable in the vertical direction, or in that the second heating station horizontally juxtaposed workpiece receiving stations has and the upstream first heat station and / or the downstream third heat station in the horizontal direction is positionally adjustable or has at least one positonsver dichotorized in the horizontal direction workpiece holder.
  • first and / or third heat station are mounted on a vertically or horizontally movable lift.
  • the workpiece receiving station forms a guideway section or is connected to a guideway section, which can be assigned to a guideway section of a workpiece receiving station of this upstream or downstream heating station for the supply of a workpiece from an upstream heat station or for the removal of a workpiece to a downstream heat station forming a guideway composed of the guideway sections.
  • the guideway sections can each be designed as a platform. They can themselves be designed as a workpiece holder or support, preferably a movable carrier, on which the respective workpiece can be arranged. In order to supply the workpieces from the stations and remove, they can by the transfer device on the example formed as a platform guide track sections of the one be moved to the other station. The platforms of the workpiece receiving stations, between which the transfer takes place, thereby forming a composite of the platforms guideway for the workpieces to be transferred.
  • the transfer device has a drive device which acts with its output side on the workpiece and / or a workpiece receiving the movable carrier and / or on a movable component of a workpiece receiving station directly or indirectly pulse-like or permanent.
  • the drive device can be designed, for example, as a rack drive, threaded rod drive or a push rod designed with a pneumatic, hydraulic or electric linear drive.
  • the transfer device may also be designed as robotic engagement arms or the like in modified embodiments.
  • control device for the operation of the transfer device and / or the operation of the heat stations can be advantageously designed as a computer-controlled electronic control device comprising at least all required for the operation of the heat treatment device measuring and control components, wherein in a computer, a control program can be stored, which coordinates and monitors the interaction of said components.
  • Fig. 1 is a schematic representation (side view) of a device according to the invention in connection with a hot forming device;
  • Fig. 2 is a partial view of the device in Fig. 1;
  • Fig. 3 shows a further embodiment of a device according to the
  • the embodiment of a heat treatment device 1 shown in FIG. 1 is a device for heating workpieces 11 to be hot-formed. In the illustrated case, this has three successive heat stations 12, 13 and 14. The heat station 14 is followed by a hot forming device 15.
  • the workpieces 11 are metallic workpieces, for example cut sheet metal parts of a vehicle body.
  • the sheet metal parts used are preferably sheet metal parts which have already been coated with a protective layer. However, provision may also be made for the workpieces 11 to be provided with a protective layer in a coating station (not shown) upstream of the heat treatment device, and then to be dried.
  • the workpieces pass through the stations shown in FIG. 1, in each case being transferred from one station to the other station in detail in the manner described below.
  • the first heat station 12 is used for rapid heating of the workpieces 11.
  • the downstream second heat station 13 takes place at a predetermined temperature in the case of the described embodiment with the precoated workpieces 11, the diffusion of the protective material into the metallic material of the workpiece.
  • the predetermined temperature is hereby set as required for the diffusion of the protective material.
  • the austenitization of the workpieces 11 takes place in the illustrated case. For this purpose, a temperature required for the desired austenitization is set.
  • the first heat station 12 has a workpiece receiving station 12a.
  • This workpiece receiving station 12a can be heated by a first heating device 12e, which is designed for rapid heating of the workpiece as an inductive heating device. But it can also be provided a different heating method, for example, conductive heating.
  • this first heat station 12 has only one workpiece receiving station 12a. It is designed as a platform on which, as seen in Figure 1, a trolley 16 is arranged.
  • the trolley 16 has a holding device, not shown in Figure 1 for receiving and fixing the workpiece 11.
  • the platform forming the workpiece receiving station 12a passes through the heat station 12 and thus forms a guide section 12f for the transfer of the workpiece, as will be explained in more detail below.
  • the first heat station 12 is arranged on a lift 17, which is vertically movable on a columnar stationary supporting and guiding body 17.
  • the second heat station 13 has a plurality of workpiece receiving stations 13a, which are arranged like a shelf in the illustrated embodiment, one above the other.
  • These workpiece receiving stations 13a are each designed as platforms, on each of which a transport carriage 16 with the workpiece 11 can be arranged.
  • the platforms each form the bottom of the receiving compartments. They each pass through the heat station 13 and thus form guideway sections 13f for the handover of the workpieces, which is explained in more detail below.
  • the workpiece receiving stations 13a of the second heat station are formed in the embodiment shown in Figure 1 as a heat-insulated receiving compartments. They have lockable inputs and outputs, which are designed for example as heat-insulated flaps.
  • the heating device of the heat station 13 may be a heating device operated by means of fuel combustion and / or electrical resistance heating.
  • the heating device is designed as a common heating device for all workpiece receiving stations of the heat station 13.
  • the workpiece receiving stations are therefore not mutually thermally insulated in the case shown, but only the outer walls and the lockable outputs and inputs are thermally insulated.
  • the third heat station 14 has only one workpiece receiving station 14a in the illustrated embodiment. 1, it can be heated in sections by three heating devices 14e, 14e 'and 14e ", the workpiece 11 being heated to temperatures necessary for the subsequent hot forming process or preferably to various suitable temperatures the zone-wise heating are arranged side by side and dimensioned so that the temperature can be adjusted or regulated separately, so that 11 temperature zones are formed in the workpiece.
  • austenite refers to ⁇ mixed crystals of iron.
  • austenite is also applied to other cubic face centered structures, such as shape memory alloys.
  • Austenite is part of many stainless steels.
  • the structure has a low hardness, but can be increased considerably by cold deformation.
  • the final temperature of the second heater 14e ' is above the austenitizing temperature
  • the end temperatures of the other two heaters 14e and 14e are below the austenitizing temperature
  • the austenitizing temperature being readable, for example, from the state diagram of the steel alloy of
  • the third heat station 14 has only one heat treatment device and no different zone heating is carried out.
  • the heat devices 14e to 14e "of the third heat station are advantageously designed as inductive heating devices, so that as in the heating device of the first heat station 12 may be provided a short heating time.
  • the workpiece receiving station 14a of the third heat station 14 is penetrated by a guideway section 14f, which is likewise designed as a platform, and can receive a transporting carriage 16.
  • the third heat station 14 is arranged in the same way as the first heat station 12 on a lift 18 which is vertically movable on a supporting and guiding body 18t.
  • the transport trolleys 16 and the guideway sections 12f, 13f and 14f are subassemblies of a transfer device which is provided for the supply of a workpiece 11 from an upstream heat station or for the removal of a workpiece 11 to a downstream heat station, wherein a guideway can be formed from associated guideway sections of the heat stations is on which the trolley 16 are movable.
  • a hot forming device 15 Downstream of the third heat station 14, a hot forming device 15 is arranged.
  • the hot-forming device 15 is a hot pressing device with a pressing tool 15p.
  • the transfer of the stored on the trolley 16 workpiece 11 can be done for example by an industrial robot, not shown in Fig. 1.
  • press hardening takes place in the area of the workpiece 11 heated by the heating device 14e ', while the area of the workpiece 11 heated by the heating devices 14e and 14e remains ductile.
  • the workpiece 11 described by way of example can advantageously be a component of a motor vehicle which can increase the safety of the vehicle against collision accidents Portions of said component may undergo highly plastic deformation upon overstress and therefore are able to absorb impact energy while the hardened portions contribute to stability.
  • the heat stations, the transfer device and the hot-forming device are advantageously connected to a control device, not shown in FIG.
  • the control device may advantageously be designed as a computer-controlled electronic control device which comprises at least all measuring and control components required for operating the heat treatment device 1, wherein a control program is stored in a computer which coordinates and monitors the interaction of said components.
  • the workpiece 11 is placed on an empty trolley 16, secured and the trolley 16 then retracted into the workpiece receiving station 12a of the first heat station 12.
  • a clamping of the workpieces is provided on the trolley.
  • an industrial robot or other suitable feeding and equipping device may be provided for loading an empty trolley 16 in the first heat station 12.
  • the workpiece 11 is now heated by the heater 12e within a predetermined, relatively short residence time in this heat station to a first temperature, which is preferably above 600 0 C. This residence time may be, for example, about 4 seconds.
  • an empty workpiece receiving station 13a in the second heat station 13 is determined by the control unit and the first workpiece receiving station 12a of the first occupied by the workpiece 11 Heat station 12 is assigned by means of the lift 17 to said empty second workpiece receiving station 13a.
  • the guide track section 12f of the first heat station is aligned with the guide track section 13f of the second heat station, so that the two guide track sections 12f, 13f form a jointly assembled guide track on which the transport carriage 16 can be moved.
  • the drive of the transfer device is now activated, which is connected to the trolley 16 so that the trolley 16 is transferred to the empty workpiece receiving station 13a of the second heat station.
  • the measurement of the residence time in the second heat station 13 is started, which is at least as large as a minimum residence time in which the diffusion process is completed.
  • This minimum residence time in the second heat station 13 is substantially greater than the residence time in the first heat station 12. It may be, for example, about 4 minutes.
  • control unit may have determined a occupied workpiece receiving station 13a of the second heat station 13, in which the second residence time is greater than the minimum residence time and the third heat treatment station 14 by means of the lift 18 this occupied workpiece receiving station 13a has been assigned by processes in the relevant position be.
  • the guide track section 13f is aligned with the guide track section 14f, so that the two guide track sections 13f, 14f form a common guide track on which the transport carriage 16 can be moved from the second heat station 13 into the third heat station 14.
  • the drive of the transfer device is activated, which is connected to the trolley 16 so that the trolley 16 to the empty Workpiece receiving station 14 a of the third heat station 14 is passed.
  • the measurement of the residence time in the third heat station 14 is started, which is predetermined to be substantially smaller than the minimum residence time in the second heat station 13.
  • it may also be provided to dispense with the time measurement in the third heat station and to end the residence time in this heat station when all three temperatures desired in this heat station have been reached.
  • the residence time in the third heat station may preferably be chosen to be on the order of the residence time in the first heat station, for example about 4 seconds.
  • the workpiece receiving station 12a of the first heat station 12 is assigned to a occupied workpiece receiving station 13a of the second heat station 13 whose minimum dwell time is exceeded and that the empty workpiece receiving station 14a of the third heat station 14 is assigned to the occupied workpiece receiving station 13a of the second heat station 13.
  • the guide track sections 12f to 14f form a guide track, wherein the transport carriage 16 arranged in the workpiece receiving station 12a displaces the transport carriage 16 arranged in the occupied workpiece receiving station 13a and pushes it into the empty workpiece receiving station 14a (see FIG. 2).
  • the drive of the trolley can be very easily designed as a rack drive, threaded rod drive or trained with a pneumatic, hydraulic or electric linear drive push rod.
  • FIG. 3 shows a second embodiment with a heat treatment device 2, which, like the heat treatment device 1 in FIG Fig. 1 and 2 is formed, with the difference that, instead of a heat treatment line for heat treatment, it has two heat treatment lines, which are arranged side by side in parallel.
  • the heat treatment apparatus 2 is shown in a schematic plan view.
  • the first heat treatment line is formed from the first heat station 12, the second heat station 13 and the third heat station 14, wherein the second heat station 13 has two workpiece receiving sites arranged side by side in each processing plane.
  • the second heat treatment line is formed from a further first heat station 12 ', the second heat station 13 and a further third heat station 14', so that twice as many workpieces 11 are heat-treated in the same time compared to the first embodiment shown in FIGS. 1 and 2. It can preferably be provided that a common hot-forming device, as described above, is connected downstream of both heat treatment lines with high capacity. But it can also be provided that each of the two heat treatment lines is followed by a hot forming device.
  • the residence times in the first heat station and in the third heat station are substantially smaller than the residence time in the second heat station. If, as stated above, the residence time in the second heating station is 4 minutes, ie 240 seconds, and the residence time in the first heating station is 4 seconds, the second residence time is 240/4 times, ie 80 times greater than the residence time in the first heat station. Consequently, the second heat station 13 must have at least 80 workpiece receiving stations 13a in order to operate in the same cycle as the first heat station 12. The second heat station 13 thus fulfills the function of a buffer memory, so that the longest cycle time is reduced to the cycle time of the first heat station 12 by parallel operation of the second heat station 13.
  • the second heat station 13 had workpiece receiving stations 13a arranged one above the other. But it is also possible that the second heat station 13 has juxtaposed workpiece receiving stations 13a, wherein instead of the lifts 17 and 18 horizontally operating transport means may be provided which assign the workpiece receiving positions each other.

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

Abstract

L'invention concerne un dispositif de traitement thermique (1) comportant éventuellement un dispositif de façonnage à chaud (15) monté en aval, qui comprend au moins un premier poste de chauffe (12) et un deuxième poste de chauffe (13) monté en aval, éventuellement un ou plusieurs poste(s) de chauffe supplémentaire(s) (14) monté(s) en aval, un dispositif de transport conçu pour déplacer les pièces à usiner (11) vers les postes de chauffe (12-14) ou à partir de ceux-ci, et un dispositif de commande destiné à faire fonctionner le dispositif de transport et/ou les postes de chauffe (12-14). Le premier poste de chauffe (12) est conçu de manière que la/les pièce(s) à usiner (11) accueillie(s) en son sein peut/peuvent être respectivement chauffée(s) pendant un premier temps de séjour prédéterminé à une première température prédéterminée. Le(s) deuxième(s) poste(s) de chauffe (13) comporte(nt) plus d'emplacements de réception de pièce à usiner (13a) que le premier poste de chauffe (12) et est/sont conçu(s) de manière que les pièces à usiner (11) accueillies en son/leur sein peuvent être chauffées à une deuxième température prédéterminée et/ou maintenues de manière constante à cette deuxième température prédéterminée, respectivement pendant un deuxième temps de séjour déterminé plus long que ledit premier temps de séjour dans le premier poste de chauffe (12). Selon l'invention, ladite deuxième température prédéterminée régnant dans le deuxième poste de chauffe (13) est approximativement égale ou supérieure à la première température prédéterminée appliquée dans le premier poste de chauffe (12). Cette invention se rapporte en outre à un procédé de traitement thermique.
EP20100720267 2009-05-04 2010-05-04 Dispositif et procédé pour chauffer des pièces à usiner façonnables à chaud Active EP2427282B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910019496 DE102009019496A1 (de) 2009-05-04 2009-05-04 Vorrichtung und Verfahren zur Erwärmung warm umzuformender Werkstücke
PCT/EP2010/002731 WO2010127837A2 (fr) 2009-05-04 2010-05-04 Dispositif et procédé pour chauffer des pièces à usiner façonnables à chaud

Publications (2)

Publication Number Publication Date
EP2427282A2 true EP2427282A2 (fr) 2012-03-14
EP2427282B1 EP2427282B1 (fr) 2015-04-22

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EP (1) EP2427282B1 (fr)
DE (1) DE102009019496A1 (fr)
WO (1) WO2010127837A2 (fr)

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EP2615396A1 (fr) * 2011-12-08 2013-07-17 Linde Aktiengesellschaft Installation et procédé de préchauffage de platines lors de déformations à chaud
DE102012001742A1 (de) 2012-01-28 2013-08-01 Volkswagen Aktiengesellschaft Vorrichtung zum Erwärmen von Blechwerkstücken für ein nachfolgendes Warmumformen und insbesondere Presshärten
DE102012218159B4 (de) * 2012-10-04 2018-02-08 Ebner Industrieofenbau Gmbh Handhabungseinrichtung
DE102012221152A1 (de) * 2012-11-20 2014-06-05 Thyssenkrupp System Engineering Gmbh System zum Temperieren von Werkstücken
DE102012221154B4 (de) * 2012-11-20 2017-05-11 Thyssenkrupp System Engineering Gmbh System zum Aufwärmen von Werkstücken
US9181123B2 (en) 2012-12-07 2015-11-10 Linde Aktiengesellschaft Thermal imaging to optimize flame polishing
DE102013101489B3 (de) * 2013-02-14 2014-06-05 Benteler Automobiltechnik Gmbh Wärmebehandlungslinie und Verfahren zum Betreiben der Wärmebehandlungslinie
DE102014211241A1 (de) * 2014-06-12 2015-12-17 Sms Elotherm Gmbh Verfahren und Erwärmungsanlage für das serienmäßige Erwärmen von Blechplatinen mit Ausbildung unterschiedlicher Temperaturzonen
DE102014110415B4 (de) 2014-07-23 2016-10-20 Voestalpine Stahl Gmbh Verfahren zum Aufheizen von Stahlblechen und Vorrichtung zur Durchführung des Verfahrens
MX2016004689A (es) * 2015-04-15 2017-04-25 Magna Int Inc Horno de multiples aberturas de formacion de aluminio en caliente y linea de produccion.
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DE102009019496A1 (de) 2010-11-18
WO2010127837A2 (fr) 2010-11-11
WO2010127837A3 (fr) 2011-01-06
EP2427282B1 (fr) 2015-04-22

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