EP2883967A1 - Procédé et dispositif de post-traitement d'un élément de formage métallique durci au moyen du chauffage par résistance électrique - Google Patents

Procédé et dispositif de post-traitement d'un élément de formage métallique durci au moyen du chauffage par résistance électrique Download PDF

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Publication number
EP2883967A1
EP2883967A1 EP14196951.9A EP14196951A EP2883967A1 EP 2883967 A1 EP2883967 A1 EP 2883967A1 EP 14196951 A EP14196951 A EP 14196951A EP 2883967 A1 EP2883967 A1 EP 2883967A1
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EP
European Patent Office
Prior art keywords
pair
component
contact pieces
mold contact
mold
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
EP14196951.9A
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German (de)
English (en)
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EP2883967B1 (fr
Inventor
Hubertus Steffens
Christoph Hahn
Benedikt Göddecke
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Muhr und Bender KG
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Muhr und Bender KG
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Publication of EP2883967A1 publication Critical patent/EP2883967A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/40—Direct resistance heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a localised treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0494—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a localised treatment
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0004—Devices wherein the heating current flows through the material to be heated
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2221/00—Treating localised areas of an article

Definitions

  • the invention relates to a method and a device for the aftertreatment of a hardened metallic molded part.
  • Such hardened metallic moldings can be produced, for example, from sheet metal blanks, which are then hot-formed, or press-hardened.
  • first partial areas of the board in a time of less than 30 seconds are brought to a temperature between 600 ° C and 900 ° C, whereupon the heat-treated board formed in a press tool to form the mold component, and the mold component in Pressing tool is tempered.
  • the board is first heated homogeneously to a temperature between 900 ° C and 950 ° C and then formed in a press tool to form the mold, and then the mold component is still tempered in the press tool.
  • partial areas of the molded component are brought to a temperature between 600 ° C and 900 ° C in a time of less than 30 seconds.
  • the partial heat treatment can be carried out by inductive heating in both methods.
  • thermoforming line has a heating device and a tempering station with an upper tool and a lower tool for cooling or heating up.
  • Replaceable temperature control plates for conductive temperature control are arranged on the upper tool and / or the lower tool.
  • first areas and second areas of the component can be tempered with different temperatures. In this case, the first areas of the component have a direct contact with the temperature control with closed temperature control, while in the second areas between the component surface and the temperature control a distance is formed.
  • a method of manufacturing a metal mold component for automotive components having higher ductility zones is known.
  • a board made of a steel alloy is heated to a temperature between 900 ° C and 950 ° C, then formed in a press tool to form the molded part and tempered.
  • the mold component is partially annealed, wherein the heating process is carried out conductively in soft annealing within a period of less than 30 seconds.
  • a method of forming a product comprising the steps of: performing a heat-treating and press-hardening process to form a product having a uniform first tensile strength; Performing a post heat treatment by selectively heating a first region above a defined temperature between 400 ° C and 700 ° C while maintaining a second region below the defined temperature; and then cooling the first region to obtain a tensile strength that is less than the first tensile strength of the press-hardened product.
  • conduction heating is suggested for heat treatment post-processing of the first region.
  • From the DE 197 23 655 A1 is a method for producing a steel sheet product by heating a cut steel sheet, hot working the steel sheet in a pair of tools, and hardening the formed product by rapidly cooling from the austenitic temperature in the pair of tools. When hardening the product parts remain unhardened by the fact that in this Partial areas a rapid cooling is avoided.
  • the present invention has for its object to propose a method for the aftertreatment of a metallic molding, with the parts on the molding with different material properties such as ductility or strength can be easily generated.
  • the object is also to propose a corresponding device which enables a partial adjustment of different material properties on a metallic molded part with high accuracy.
  • a solution consists of a method of after-treatment of a deformed and hardened metallic material component by means of an electric resistance heating apparatus comprising at least a first pair of mold contact pieces and a second pair of mold contact pieces, comprising the steps of: contacting a first portion to be heated the component with the mold contact pieces of the first pair such that the first portion to be heated is arranged between the mold contact pieces of the first pair; Contacting a second portion of the component with the mold contact pieces of the second pair such that the second portion is disposed between the mold contact pieces of the second pair; Heating the first portion of the component to a first temperature (T1) by passing electrical current through the component by means of the first pair of mold contact pieces; Tempering the second portion of the component by means of the second pair of mold contact pieces to a second temperature (T2), wherein the second temperature (T2) is set independently of the first temperature (T1) or is adjustable.
  • the hardened component can be selectively softened in partial areas, in order to achieve a higher ductility here, whereby, for example, subsequent machining processes can be simplified.
  • the ductility of the component can be adjusted in different areas targeted to the individual requirements. For example, it is possible to heat the first portion by heating To soften a higher first temperature while an adjacent second portion is cooled simultaneously to a second temperature and thus maintains a higher hardness. But it is also possible by appropriate adjustment of the first and second temperatures in both partial areas to achieve a hardening compared to the cured state, but to varying degrees.
  • the first pair of mold contact pieces and the second pair of mold contact pieces can be individually controlled with respect to at least one parameter influencing the degree of heating.
  • the electric current can be controlled
  • the temperature of a cooling medium can be controlled.
  • the term hardened metallic component is understood to be any metallic component which has been shaped as part of a forming process and at the same time or subsequently has been completely hardened, at least in partial regions.
  • the component can have partial regions with different sheet thicknesses, which can be produced, for example, by flexible rolling of strip material or by joining a plurality of components of different sheet thickness.
  • flexible rolling produced boards with different sheet thicknesses are also referred to as Tailor Rolled Blanks. Boards, which are composed of several sub-boards with different sheet thickness and welded, are also called Tailor Welded Blanks.
  • the component can also be composed of different materials; It is crucial that it has at least one metallic portion, which is formed into a particular three-dimensional shape.
  • the component can also be referred to as a molded part.
  • the first pair of mold contact pieces and the second pair of mold contact pieces are disposed immediately adjacent to each other, or are brought into contact with the component immediately adjacent to each other.
  • the component is safe held between the contact pieces and it can be selectively heat treated defined portions.
  • a softened partial area can be limited to a defined area by cooling an immediately adjacent partial area.
  • the mold contact pieces used for cooling have a thermally insulating effect, so that the component properties are changed only in the first part.
  • the molded contact pieces may also be referred to as shaping electrodes or as shaped jaws.
  • the at least one first pair of mold contact pieces is designed for post-treatment of the component by means of conductive heating. It is meant by at least a first pair, that also a plurality of first pairs of mold contact pieces may be provided for conductive heating of portions of the component.
  • conductive heating the metallic component forms part of the electrical circuit. In this case, a standing in contact with the mold contact pieces area of the component is traversed by electric current. Due to the electrical resistance occurs in the area traversed by electrical energy heating of the component, which is why this method is also referred to as resistance heating.
  • the first portion is heated to a first temperature which is at least 200 ° C, preferably at least 500 ° C, in particular at least 700 ° C, and / or at most 900 ° C.
  • a first temperature which is at least 200 ° C, preferably at least 500 ° C, in particular at least 700 ° C, and / or at most 900 ° C.
  • the first portion is heated for a period of at least 30 seconds.
  • the following preferred embodiments are given: at up to 700 ° C at least 5 minutes holding time; at least 2.5 minutes holding time at up to 750 ° C; at least 1.25 minutes holding time at up to 800 ° C; and at over 850 ° C at least 30 seconds holding time.
  • the at least one second pair of mold contact pieces serves to temper an associated second partial region of the component to a different or second temperature than that of the first partial region, wherein the temperature control of the second partial region to the second temperature can be heating or cooling.
  • the step of tempering the second portion of the component is heating, which is carried out by passing electrical current from one of the mold contact pieces through the component to the other of the molded contact pieces.
  • the current flow for the second pair can be controlled individually, that is to say independently of the first pair. For example, a lower or higher electrical energy can be entered into the component in the second subregion so that the geometric features such as a smaller or larger sheet thickness of the second subregion can be taken into account.
  • the first portion and the second portion of the component are heated by passing electrical current through the first pair of molded contact pieces on the one hand and the second pair of molded contact pieces on the other; and / or electrical current is passed through the component with at least partial temporal overlap from the first pair of mold contact pieces and from the second pair of mold contact pieces; and / or the first partial area and the second partial area of the component are heated by passing electrical current with different current strengths through the first pair of molded contact pieces on the one hand and through the second pair of molded contact pieces on the other hand.
  • the shaped contact pieces of the first, second and optionally another pair designed as shaping electrodes can also be designed as segments of a single electrode, with the individual segments being individually controllable.
  • the step of tempering the second portion of the component is cooling, which is done by cooling the mold contact pieces of the second pair.
  • the mold contact pieces of the second pair for example be designed as a heat sink, which are cooled by suitable means such as an integrated cooling circuit. By contacting the heat sink with the second portion of the component of this is cooled, so that there is no or only a small softening.
  • the hardened component is preferably a shaped part made of sheet steel whose thickness is only a fraction of the extension in the longitudinal or transverse direction of the component, or whose length and width in each case is a multiple of the thickness.
  • a steel material for example, 22MnB5 can be used, with any other hardenable steel material is also conceivable.
  • the component is arranged between the mold contact pieces such that the mold contact pieces of a pair lie opposite one another in the thickness direction of the component.
  • This may apply to the first pair and / or the second pair of mold contact pieces.
  • a first mold contact of a pair is brought into contact with a bottom of the component while the second mold contact is brought into contact with the top of the component.
  • the component is held or clamped between the mold contact pieces.
  • the functional surfaces of the mold contact pieces, which are in contact with the component during heating are preferably adapted in terms of their geometry to the shape of the component.
  • the mold contact pieces of the first pair which are used for conductive heating, thus assume two functions, namely on the one hand, the introduction of electrical current into the component and on the other a fixing of the component between the contact surfaces.
  • the mold contact pieces of the second pair can, depending on the design, perform one or two functions, depending on whether they serve only for cooling, or for conductive heating.
  • an upper mold contact piece of the first pair and an upper contact piece of the second pair are brought into contact with the component at the same time; and / or a lower mold contact piece of the first pair and a lower contact piece of the second pair are simultaneously brought into contact with the component.
  • the component is arranged between the mold contact pieces such that the mold contact pieces of a pair lie opposite one another in a transverse direction of the component.
  • This in turn may apply to the first pair and / or the second pair of mold contact pieces.
  • both of the formula electrodes of a pair that is to say the positively poled electrode and the negatively poled electrode, are arranged in a thickness region with a uniform thickness in the transverse direction. In this way, a uniform heating of this section is achieved.
  • a first mold contact piece of the pair is brought into contact with a first edge portion of the component, while the second mold contact piece is brought into contact with an opposite second edge portion of the component.
  • the mold contact pieces can be designed in this second possibility as gripping jaws or gripper tongs, which are clamped to the respective edge portion.
  • At least one of the following steps can be provided: flexible rolling of strip material; Working out a board of flexibly rolled strip material, the board having a variable thickness over the length; Hot forming a board to the component; complete hardening of the component; Cleaning the component; and / or descaling the component. It is understood that further process steps are conceivable, previous, subsequent or further intermediate steps.
  • a device for post-treatment of a formed and hardened component made of a metallic material comprising: at least a first pair of mold contact pieces, which are used as shaping electrodes for passing electrical current through a first Partial region of the component are designed, wherein the contact surfaces of the mold contact pieces of the first pair are adapted to outer surfaces of the first portion, wherein the first portion of the component is heated when passing electrical current to a first temperature; at least a second pair of mold contact pieces for tempering a second portion of the component, wherein the contact surfaces of the mold contact pieces of the second pair are adapted to outer surfaces of the second portion; wherein means are provided with which the second pair of mold contact pieces is adjustable to a second temperature, which is different from the first temperature.
  • the second partial region of the component is arranged adjacent to the first partial region and, correspondingly, the second pair of molded contact elements is arranged adjacent to the first pair of molded contact pieces.
  • the apparatus can also have further pairs of mold contact pieces in order to specifically soften or to produce a higher ductility thereon of other portions of the component.
  • the device thus offers a high degree of flexibility in order to set different zones of the component as required to defined material properties. This is especially true for those zones that are later treated further manufacturing technology, for example, welded or drilled for tying to other components.
  • the mold contact pieces of the second pair are, in a first possibility, shaped as shaping electrodes for passing electrical current through the second portion of the component.
  • an electronic control unit is preferably provided, with which the passage of electric current through the shape of the electrodes of the first pair on the one hand and the shape of the electrodes of the second pair is individually controllable with respect to at least one parameter influencing the heating of the component.
  • the mold contact pieces of the second pair are designed as cooling contact pieces, with which the second portion is adjustable to the temperature below the temperature.
  • the cooling contact pieces may have integrateddenik conception through which flows through a cooling medium such as water or steam.
  • means are provided with which at least the mold contact pieces of the first pair are movable towards each other to come into contact with an upper and a lower outer surface of the component.
  • These means may be designed in the form of a feed or drive, with which the mold contact pieces of a respective pair are movable relative to each other. This includes as options that a contact piece is arranged stationary and another is moved relative thereto, or that both contacts are moved towards each other at the same time.
  • means may further be provided with which a plurality of adjacent mold contact pieces are movable together to come into contact with an outer surface of the component.
  • contact pieces of a first pair and a second pair may be arranged immediately adjacent to one another and accommodated in a common tool. By moving the tool, the contact pieces received therein are also moved together, which has the advantage that they come into contact with the component at the same time and unfold their tempering or shape-retaining function here.
  • lower mold contact pieces are provided in a lower tool part, on which the component is placed.
  • movable upper tool part corresponding upper mold contact pieces can be arranged, which cooperate with the lower contact pieces.
  • the first mold contact of the first pair has a mold surface adapted to a first surface of the component and the opposed second mold contact has a second mold surface adapted to the opposite second surface of the component.
  • this also applies equally to the mold contact pieces of the second and optionally each further pair.
  • the shape contact pieces of the first and / or second pair designed as shaping electrodes preferably each have a contact area which is smaller than 400 mm 2 . This achieves a good current introduction into the component and a good adaptation to the component geometry.
  • FIGS. 1 and 2 show a device 2 according to the invention for the post-treatment of a formed and hardened component 3, which is made of a metallic material, in a first embodiment.
  • the device 2 comprises a first pair of mold contact pieces 4, 5, which are designed as shaping electrodes for passing electrical current through a first portion 6 of the component 3.
  • the contact surfaces 7, 8 of the mold contact pieces 4, 5, which may also be referred to as functional surfaces, are adapted to outer surfaces 9, 10 of the first portion 6.
  • the shaped electrodes 4, 5 are brought into surface contact with the component 3, which is clamped between an upper and a lower shaped electrode 4, 5.
  • electrical current is passed through the first portion 6, so that this portion 6 is heated due to the electrical resistance to a first temperature T1.
  • the first portion 6 is in FIG. 1 hatched shown.
  • the mold contact pieces 4, 5 have in plan view a corresponding to the contour of the first area designed contact surface.
  • a special feature of the present embodiment is that the component 3 is arranged in its thickness direction between the two mold contact pieces 4, 5.
  • a lower mold contact piece 5 is brought into contact with the underside of the component 3, while an upper mold contact piece 4 is brought into contact with the upper side of the component.
  • the contact surfaces 7, 8 of the mold contact pieces 4, 5 of the first pair is preferably smaller than 400 mm 2 for a good current introduction, wherein in principle even larger surfaces are conceivable.
  • the electric current flows substantially perpendicular to the contact surface 7, 8, that is substantially in the thickness direction of the component 3. This results in a rapid heating.
  • the first portion 6 is heated to a first temperature T1, which is at least 500 ° C, preferably at least 700 ° C.
  • a maximum limit for the first temperature T1 may in particular be 900 ° C.
  • the first portion 6 is heated over a period of at least 30 seconds, so that the formation of undesired hardness distortions is reduced.
  • the device 2 further comprises a second pair of mold contact pieces 44, 45 for tempering a second portion 46 of the component 3 to a second temperature T2. Even with the second pair, the contact surfaces 17, 18 of the mold contact pieces 44, 45 are adapted to the outer surfaces 19, 20 of the second portion 46 accordingly.
  • the mold contact pieces 44, 45 of the second pair are designed here as cooling contact pieces, with which the second portion 46 is adjustable to the temperature T2 below the temperature T1.
  • cooling contact pieces 44, 45 ensures that the heat introduced into the component 3 by means of the shaping electrodes 4, 3 remains spatially limited to the first portion 6 and only here leads to a softening, while the second portion 46 due to the cooling its Maintains initial strength.
  • the mold contact pieces 44, 45 of the second pair are preferably set to a temperature T2 of less than 300 ° C, more preferably of less than 200 ° C or even less than 100 ° C.
  • the mold contact pieces of the first pair (4, 5) and the second pair (44, 45) are made of a high-strength temperature-resistant material. In shape and size they are, as explained above, designed to be heated or to be cooled portions of the component. By the adjoining first mold contact pieces 4, 5 for heating and second mold contact pieces 44, 45 for cooling, a short transition region is advantageously realized between the softened first portion and the untreated second portion. The acted upon by electric current form contact pieces 4, 5 can be cooled to increase the service life.
  • the device may be constructed in two parts, and comprise a lower tool part, in each of which a first mold contact piece 5, 45 of the first and second pair are arranged, and an upper tool part, in each of which the corresponding second mold contact piece 4, 44 of the first and second pair are arranged.
  • the component 3 between the lower and upper mold contact pieces 5, 45; 4, 44 pinched By moving the upper tool part in the direction of the lower tool part, or vice versa, the component 3 between the lower and upper mold contact pieces 5, 45; 4, 44 pinched.
  • a suitable mechanism may be provided for moving the tool part.
  • FIGS. 3 and 4 which will be described together below, show a device according to the invention in a second embodiment. This corresponds in terms of their design and operation in large parts of those according to the Figures 1 and 2 , so that reference is made to the above description in terms of similarities. The same or corresponding details are provided with the same reference numerals, as in the Figures 1 and 2 ,
  • a special feature of the present embodiment according to the FIGS. 3 and 4 is that four pairs of mold contact pieces are provided, it being understood that also a different number of two, three, five or more pairs can be used.
  • the mold contact pieces of each pair 4, 5; 14, 15; 24, 25; 34, 35 are designed as shaping electrodes with which electrical current can be passed through the component 3.
  • a first partial area 6 is heated by the first pair 4, 5, a second partial area 16 by the second pair 14, 15, a third partial area 26 by the third pair 24, 25 and a fourth partial area 36 by the fourth pair 34, 35 ,
  • the pairs of mold contact pieces can be individually controlled with regard to one or more parameters influencing the degree of heating, for example with regard to the current intensity or the energization duration.
  • the various subregions 6, 16, 26, 36 can be heated individually.
  • the first pair of shaping electrodes 4, 5 may be heated to a first temperature T1 while the second pair of shaping electrodes 14, 15 may be heated to a different one second temperature T2 can be heated.
  • the third and fourth pairs of shaping electrodes 24, 25; 34, 35 can be individually controlled with respect to the desired temperature, and can be set to one of the temperatures T1 or T2, or deviating temperatures.
  • FIGS. 5 and 6 which will be described together below, show a device according to the invention in a third embodiment. This corresponds in terms of their design and operation of a combination of embodiments according to the Figures 1 and 2 with the one according to the FIGS. 3 and 4 , so that reference is made to the above description in terms of similarities. The same or corresponding details are provided with the same reference numerals, as in the FIGS. 1 to 4 ,
  • FIGS. 5 and 6 A special feature of the present embodiment is according to the FIGS. 5 and 6 is that these four pairs of mold contact pieces 4, 5; 14, 15; 24, 25; 34, 35 which are designed as shaping electrodes and designed for heating or defrosting of the subregions 6, 16, 26, 36. It applies that in connection with the FIGS. 3 and 4 Said alike.
  • a pair of mold contact pieces 44, 45 are provided, which are designed as cooling contact pieces, corresponding to the cooling contact pieces 44, 45 according to the Figures 1 and 2 , In this respect applies with respect to the cooling contact pieces in connection with the Figures 1 and 2 Said alike. Reference is made in this regard to the above description.
  • One advantage of the present embodiment is that only a small transition region is formed between the heated or softened partial regions 6, 16, 26, 36 and the cooled partial region 46. This is achieved in that the shaping electrodes 4, 5; 14, 15; 24, 25; 35, 36 on the one hand and the cooling contact pieces 44, 45 on the other hand spatially adjacent to each other.
  • FIGS. 7 to 10 show a device according to the invention in a further embodiment. This corresponds in its design and operation in large parts of those according to the Figures 1 and 2 , so that reference is made to the above description in terms of similarities. The same or corresponding details are provided with the same reference numerals, as in the Figures 1 and 2 ,
  • a peculiarity of the present embodiment is that the mold contact pieces 4, 5 of the first pair are arranged opposite to each other in a transverse direction of the component 3 only in peripheral areas of the component 3.
  • a between the negative shape electrodes 4, 4 'and the positive shape electrodes 5, 5 'flowing stream heats the component 3 across its width between the negative and positive electrodes. It results in total in FIG. 10 shown unbonded first portion 6, which is shown hatched.
  • the mold contact pieces of the second pairs are each designed as cooling contact pieces.
  • the cooling contact pieces 44, 45; 54, 55 are schematically in FIG. 7 shown.
  • the cooling zones 46, 56, which of the cooling contact pieces 44, 45; 54, 55 are generated schematically in FIG FIG. 10 shown. Between the cooling zones 46, 56 is located in the transverse direction of the component 3 extending soft zone 6, which is also referred to as a deconsolidated portion.
  • the second pairs each have a lower mold contact piece 45 and an upper mold contact piece 44, which are each adapted to the geometry of the component 3 with regard to their shape.
  • the second pairs of mold contact pieces 44, 45; 54, 55 correspond in terms of structure and operation in the Figures 1 and 2 shown embodiment, so that in this respect short-term reference is made to the above description.
  • the second pair is arranged in the post-processing immediately adjacent to the first pair, so that the in FIG. 10 shown cooling zones 46, 56 with intermediate soft zone 6 of the component 3. Between the cooling zones 46, 56 and the soft zone 6 only small transition areas are formed.
  • the component 3 which is the lower part of a B-pillar for a motor vehicle, may have a uniform sheet thickness over the length and width, or it may have a variable sheet thickness over the length and / or width. This can be achieved for example by flexible rolling of the strip material used as the starting material. For a uniform heating or uniform softening, it is favorable if the first pair of molded contact pieces 4, 4 ', 5, 5' are arranged in a region of uniform sheet thickness. In the present case this would be the subarea 6.
  • a method according to the invention for the aftertreatment of a formed and hardened component from a metallic material may comprise the following steps.
  • a first partial region of the hardened component to be heated is brought into contact with the molded contact pieces of the first pair.
  • the mold contact pieces of a second pair are brought into contact with a second portion of the component.
  • the first subregion of the component is heated to a first temperature T1 by passing electrical current through the component by means of the first pair of molded contact pieces.
  • the first portion is heated to a first temperature of at least 500 ° C, in particular at least 700 ° C, with a preferred heating time of at least 30 seconds.
  • a second portion which is in particular adjacent to the first portion, tempered by means of one or more second pairs of mold contact pieces to a second temperature T2, that is, heated or cooled.
  • the tempering of the second partial region of the component takes place with regard to at least one parameter influencing the degree of heating, independently of the heating of the first partial region.
  • the tempering (heating) can be done by selecting a different energizing time or other current than the first pair.
  • the tempering (cooling) can take place by controlling the flow or the temperature of the cooling medium.
  • the described method can be combined with one of the devices for electrical resistance heating according to one of the FIGS. 1 to 10 having at least a first pair of mold contact pieces 4, 5 and a second pair of mold contact pieces 44, 45.
  • the above-described method for reworking the hardened component for producing softened partial areas or soft zones may be preceded, for example, by the following method steps: Flexible rolling of strip material; Working out a board from the flexibly rolled strip material, the board having a variable thickness over the length; Hot forming a board to the component; complete hardening of the component; Cleaning the component; and / or descaling the component.
  • An advantage of a device or method according to the invention is that the previously hardened component 3 can be specifically softened in partial regions 6, 16, 26, 36 in order to achieve a higher ductility here.
  • the ductility of the component can be adapted to the individual requirements in different partial areas, or the molded contact pieces themselves can be adapted to different requirements with regard to the geometry of the component.

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EP14196951.9A 2013-12-10 2014-12-09 Procédé et dispositif de post-traitement d'un élément de formage métallique durci au moyen du chauffage par résistance électrique Active EP2883967B1 (fr)

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DE102013225409.1A DE102013225409A1 (de) 2013-12-10 2013-12-10 Verfahren und Vorrichtung zur Nachbehandlung eines gehärteten metallischen Formteils mittels elektrischer Widerstandserwärmung

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US (1) US10260118B2 (fr)
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ES (1) ES2629205T3 (fr)

Cited By (2)

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WO2017020888A1 (fr) * 2015-08-04 2017-02-09 Benteler Automobiltechnik Gmbh Dispositif et procédé pour effectuer un traitement de revenu local d'éléments métalliques
WO2017172546A1 (fr) 2016-03-29 2017-10-05 Magna International Inc. Montant milieu présentant des propriétés adaptées

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Publication number Priority date Publication date Assignee Title
TWI583797B (zh) * 2015-08-25 2017-05-21 Nat Kaohsiung First Univ Of Science And Tech Local heating device for plate and heating method thereof
DE102015122390A1 (de) * 2015-12-21 2017-06-22 Scania Cv Ab Verfahren zur konduktiven Erwärmung eines flächig ausgebildeten metallischen Bauteils
US20220017982A1 (en) * 2018-11-05 2022-01-20 Magna International Inc. Localized resistance annealing process
CN113997548A (zh) * 2021-10-26 2022-02-01 吉林省正轩车架有限公司 一体成型门环ttp的工艺方法

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DE19723655A1 (de) 1996-06-07 1997-12-11 Ssab Hardtech Ab Verfahren zur Herstellung von Stahlblechprodukten
DE19743802A1 (de) 1996-10-07 1999-03-11 Benteler Werke Ag Verfahren zur Herstellung eines metallischen Formbauteils
DE10212819A1 (de) * 2002-03-22 2003-10-16 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines metallischen Bauteils
DE102011078075A1 (de) 2010-06-24 2012-03-29 Magna International Inc. Durch Warmbehandlungsnachbearbeitung passendgemachte Eigenschaften
DE102010004823B4 (de) 2010-01-15 2013-05-16 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines metallischen Formbauteils für Kraftfahrzeugkomponenten
DE102012110649B3 (de) 2012-11-07 2013-11-14 Benteler Automobiltechnik Gmbh Warmformlinie sowie Verfahren zur Herstellung eines warmumgeformten und pressgehärteten Kraftfahrzeugbauteils

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JPH10280054A (ja) 1997-04-03 1998-10-20 Nippon Steel Corp 金属材料の加熱方法及び加熱装置
US5972134A (en) 1997-10-02 1999-10-26 Benteler Ag Manufacture of a metallic molded structural part
US7461874B2 (en) * 2006-08-30 2008-12-09 Shape Corporation Selectively annealed bumper beam
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JP5443153B2 (ja) * 2009-12-25 2014-03-19 トヨタ自動車株式会社 加熱装置及び加熱方法
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DE877179C (de) * 1950-12-06 1953-05-21 Wilhelm Dipl-Ing Dr Stich Verfahren und Anordnung zur elektrischen Widerstandserhitzung von Stahlstaeben, verbunden mit deren Ausrichtung
DE19723655A1 (de) 1996-06-07 1997-12-11 Ssab Hardtech Ab Verfahren zur Herstellung von Stahlblechprodukten
DE19743802A1 (de) 1996-10-07 1999-03-11 Benteler Werke Ag Verfahren zur Herstellung eines metallischen Formbauteils
DE10212819A1 (de) * 2002-03-22 2003-10-16 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines metallischen Bauteils
DE102010004823B4 (de) 2010-01-15 2013-05-16 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines metallischen Formbauteils für Kraftfahrzeugkomponenten
DE102011078075A1 (de) 2010-06-24 2012-03-29 Magna International Inc. Durch Warmbehandlungsnachbearbeitung passendgemachte Eigenschaften
DE102012110649B3 (de) 2012-11-07 2013-11-14 Benteler Automobiltechnik Gmbh Warmformlinie sowie Verfahren zur Herstellung eines warmumgeformten und pressgehärteten Kraftfahrzeugbauteils

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017020888A1 (fr) * 2015-08-04 2017-02-09 Benteler Automobiltechnik Gmbh Dispositif et procédé pour effectuer un traitement de revenu local d'éléments métalliques
US10954575B2 (en) 2015-08-04 2021-03-23 Benteler Automobiltechnik Gmbh Device and method for tempering sections of metal components
WO2017172546A1 (fr) 2016-03-29 2017-10-05 Magna International Inc. Montant milieu présentant des propriétés adaptées
EP3436207A4 (fr) * 2016-03-29 2019-11-27 Magna International Inc. Montant milieu présentant des propriétés adaptées
US11148725B2 (en) 2016-03-29 2021-10-19 Magna International Inc. B-pillar with tailored properties

Also Published As

Publication number Publication date
EP2883967B1 (fr) 2017-05-03
CN104694714B (zh) 2018-10-02
CN104694714A (zh) 2015-06-10
US10260118B2 (en) 2019-04-16
US20150159234A1 (en) 2015-06-11
ES2629205T3 (es) 2017-08-07
DE102013225409A1 (de) 2015-06-11

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