EP1646458B1 - Procédé de fabrication des éléments trempés à la presse - Google Patents

Procédé de fabrication des éléments trempés à la presse Download PDF

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Publication number
EP1646458B1
EP1646458B1 EP04739467.1A EP04739467A EP1646458B1 EP 1646458 B1 EP1646458 B1 EP 1646458B1 EP 04739467 A EP04739467 A EP 04739467A EP 1646458 B1 EP1646458 B1 EP 1646458B1
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EP
European Patent Office
Prior art keywords
component
hardened
press
blank
component blank
Prior art date
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Expired - Fee Related
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EP04739467.1A
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German (de)
English (en)
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EP1646458A1 (fr
Inventor
Martin Brodt
Roland Wendler
Leonid Levinski
Victor Samoilov
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THERMISSION AG
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Thermission AG
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/02—Pretreatment of the material to be coated
    • 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
    • B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/049—Work hardening with other step
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49616—Structural member making
    • Y10T29/49622—Vehicular structural member making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49982—Coating
    • Y10T29/49986—Subsequent to metal working
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49995—Shaping one-piece blank by removing material

Definitions

  • the invention relates to a method for producing a press-hardened component according to the preambles of independent claims 1 and 2, see DE 101 49 221 C1 ,
  • a blank is first cut out of a coil, which then above the microstructure transformation temperature of the steel material, above which the material structure is in the austenitic state, heated, placed in the heated state in a forming tool and formed into the desired component shape and under mechanical fixation the desired UmformGraphs cooled, with a compensation or curing of the component takes place.
  • the component is subjected to a preforming step or a clipping step prior to the actual hot working. This is for example in the DE 101 49 221 C1 described.
  • a preforming step or a clipping step prior to the actual hot working.
  • This is for example in the DE 101 49 221 C1 described.
  • a method may cause corrosion problems because a commonly applied tape coating will be damaged during preforming.
  • Conventional preforming and cutting of the components, especially in precoated high-strength steels such as Usibor 1500 PC, which has an AlSi coating, is not possible because the precoat is too brittle and the corrosion protection would be lost.
  • the object of the invention is to specify a press-hardened component as well as a production method for press-hardened components, which enables reliable corrosion protection and at the same time is suitable for series production.
  • a first embodiment of the method according to the invention for the production of press-hardened components comprises the following method steps: from the semifinished product, a component blank is formed by a cold-forming method, in particular a drawing method; the component blank is trimmed at the edge on a part of the wall to be produced approximately corresponding boundary contour; the trimmed component blank is heated and press-hardened in a hot-forming tool; the press-hardened component blank is coated in a coating step with a corrosion-protective layer.
  • this embodiment of the invention makes it possible to design the component manufacturing process in such a way that it is possible to dispense with the procedurally complex and costly final trimming of the hardened component.
  • the edge regions are therefore already cut in the uncured state of the component and not only - as usual in hot forming usual - after the heating and hardening process.
  • By pruning the workpiece already in the soft state significantly lower cutting forces are required than for cold-cutting hardened materials, resulting in reduced tool wear and a reduction in the maintenance cost of the cutting tools.
  • the risk of rapid cracking due to the high notch sensitivity of these materials is significantly reduced when trimming the high strength material in the uncured state.
  • a corrosion-protective layer is applied, so that the component is completely, so also at the edges, coated.
  • the following method steps are carried out: the semi-finished product is heated and press-hardened in a hot-forming tool; the component blank produced in this way is trimmed at the edge to a boundary contour corresponding to the component to be produced; the press-hardened, trimmed component blank is coated with a corrosion-protective layer in a coating step.
  • the trimming of the cured component is preferably carried out by means of a laser or the Water-jet cutting process, through which a high-quality trimming of the component edges can be achieved.
  • the subsequent application of a corrosion protection layer ensures that the component is also protected against corrosion in the area of the trimmed edges.
  • the layer By applying the layer to the press-hardened component blank by means of a thermal diffusion method, it is possible to use a readily controllable method with which a layer of zinc or a zinc alloy can preferably be applied, which is also suitable for complex component geometries and for Edge layering is suitable.
  • the layer thickness can be adjusted in a targeted manner between a few ⁇ m and over 100 ⁇ m . A thermal load of the component is low.
  • Components can be coated regardless of their size, dimensions, configuration, complexity and weight.
  • Cleaning the press-cured component blank prior to the dry cleaning coating step improves the adhesion of the layer. A scaling caused by the hot working on the surface is eliminated. A chemical pre-cleaning can be omitted.
  • the component blank is cleaned of residues after the coating step, e.g. with ultrasound, and passivated, a surface is formed, which gives a good primer for coatings, especially primers or paints.
  • the component blank is tempered after the coating step. It is particularly advantageous if the component blank is coated with a zinc-containing layer, since an oxide is formed on the surface, which is suitable as a primer.
  • a press-hardened component in particular a body component, from a semifinished product of uncured, hot-forming steel sheet, is produced according to at least one of the developments of the method according to the invention.
  • a component is particularly suitable with a corresponding mass production in large numbers produced and combines an advantageous weight reduction of the component with excellent corrosion protection.
  • FIGS. 1a to 1f schematically show an inventive method for producing a spatially shaped, press-hardened component 1 from a semifinished product 2.
  • a board 3 is used as a semifinished product 2, which is cut out of a developed coil 5.
  • a composite sheet are used, as for example in the DE 100 49 660 A1 is described and which consists of a base plate and at least one reinforcing plate.
  • a Taylored Blank can be used, which consists of several welded together sheets of different material thickness and / or different material properties.
  • the semifinished product 2 may be a three-dimensionally shaped sheet-metal part produced by any forming process which is to undergo further deformation and a strength and / or rigidity increase with the aid of the method according to the invention.
  • the semifinished product 2 consists of an unhardened, hot-forming steel sheet.
  • a particularly preferred material is a water-hardening tempering steel, as it is sold for example by the German company Benteler AG with the trade name BTR 165.
  • This steel has the following alloy components in which the alloy components to be added in addition to the base metal iron are to be understood as percent by weight: carbon 0.23 to 0.27% silicon 0.15 to 0.50% manganese 1.10-1.40% chrome 0.10 to 0.35% molybdenum 0.00 to 0.35% titanium 0.03-0.05% aluminum 0.02-0.06% phosphorus Max. 0.025% sulfur Max. 0.01% others in total 0.0020 to 0.0035%.
  • a first process step I the board 3 ( Fig. 1a ) are cut from a developed and straightened portion of a coil 5 of a hot-forming sheet.
  • the thermoformable material is at this time in an uncured state, so that board 3 can be easily cut using conventional mechanical cutting means 4, for example a scissors.
  • the cutting of the board 3 is advantageously carried out with the help of a platinum press 6, which ensures an automated feeding of the coil 5 and an automatic punching and removal of the cut-out board 3.
  • board 3 is in 2a shown in a schematic perspective view.
  • the cut-out blanks 3 are deposited on a stack 7 and fed in stacked form to a cold-forming station 8 (FIG. Fig. 1b ).
  • a cold-forming station 8 for example, a two-stage thermoforming tool 9, a Component blank 10 formed.
  • the board 3 has edge regions 11 which protrude beyond an outer contour 12 of the component 1 to be molded.
  • the component blank 10 is formed close to the final contour.
  • close-to-net shape should be understood to mean that those parts of the geometry of the finished component 1 which are accompanied by a macroscopic flow of material are completely formed in the component blank 10 after the cold-forming process has been completed. After completion of the cold forming process, only slight conformations of shape are required to produce the three-dimensional shape of the component 1, which require a minimum (local) material flow; the component blank 10 is in Fig. 2b shown.
  • the near-net shape shaping can take place in a single deep-drawing step, or it can take place in several stages ( Fig. 1b ).
  • the component blank 10 is inserted into a cutting device 15 and cut there (process step III, FIG. Fig. 1c ).
  • the material is still in the uncured state at this time, so trimming can be accomplished by conventional mechanical cutting means 14 such as cutting knives, folding and / or punching tools.
  • a separate cutting device 15 may be provided.
  • the cutting means 14 may be integrated into the last stage 9 'of the deep-drawing tool 9, so that in the last deep-drawing stage 9' in addition to the final shaping of the sheet metal blank 10, the edge trimming takes place.
  • the process steps II and III are integrated in a single processing station, in which the forming and cutting is carried out fully automatically.
  • the removal of the component blank 17 can be automated or there may be a manual removal and stacking of the component blanks 17.
  • the trimmed component blank 17 is subjected to hot working in a hot forming area 26, in the course of which it is formed and hardened to a final shape of the component 1.
  • the trimmed component blank 17 is inserted by a manipulator 20 in a continuous furnace 21, where it is heated to a temperature which is above the structural transformation temperature in the austenitic state; Depending on the grade of steel, this corresponds to heating to a temperature between 700 ° C and 1100 ° C.
  • BTR 165 is a favorable range between 900 ° C and 1000 ° C.
  • the atmosphere of the continuous furnace is expediently rendered inert by adding a protective gas to a scaling of the uncoated interfaces of the edge contour 12 'of the trimmed component blanks 17 or, when using uncoated blanks 3, on the entire blank surface to prevent.
  • a suitable shielding gas is eg carbon dioxide or nitrogen.
  • the heated trimmed component blank 17 is then inserted by means of a manipulator 22 in a hot forming tool 23, in which the three-dimensional shape and the edge contour 12 'of the trimmed component blank 17 are brought to their desired level. Since the trimmed component blank 17 already has near net shape dimensions, only a slight adaptation of the shape is necessary during hot forming.
  • the hot forming tool 23 the trimmed component blank 17 is finished and rapidly cooled, whereby a fine-grained martensitic or bainitic material structure is set. This step corresponds to a hardening of the component blank 18 and allows a targeted adjustment of the material strength. Details of such a curing process are eg in the DE 100 49 660 A1 described.
  • the hardened component blank 18 is taken out of the hot forming tool 23 with a manipulator and optionally stacked until further processing. Because of the hot-forming process upstream end-contour trimming of the component blank 10 and the shape adjustment of the edge contour 12 'in the hot forming tool 23, the component 18 after completion of the hot forming process already the desired outer contour 24 of the finished component 1, so that after the hot forming no time-consuming trimming the edge of the component is necessary.
  • the component blank 18 quenched in a cooled hot forming tool 23.
  • the hot forming of the component blank 18 is usually associated with the use of uncoated blanks 3 with a scaling of the surface, so that the surface must then be cleaned.
  • the cycle times in the production method are advantageously short.
  • the cooling of the component blank 18 is now a bottleneck.
  • air-hardening or water-hardening materials for the components 1 can be used.
  • the component blank 18 only needs to cool down until a sufficient heat resistance, rigidity and associated dimensional stability of the component blank 18 is achieved. Then, the component blank 18 can be removed from the tool 23, so that the further heat treatment process takes place in the air or in water outside of the tool 23, which then very quickly after a few seconds again for receiving further component blanks 17 is available.
  • the press-hardened component blank 18 is first subjected to a dry cleaning in a dry cleaning system 25 and then coated in a coating process with a corrosion of the component 1 preventing layer 34.
  • the surface of the component blanks 18 is then substantially free of oxide.
  • the component blanks 18 are heated slowly at about 5-10 K / min with slow rotation of the drums 31 to about 300 ° C.
  • the zinc or zinc alloy is distributed substantially homogeneously over the entire surface of the component blanks 18 and bonds to the surface.
  • the component blanks 18 which can be set arbitrarily between a few ⁇ m and over 100 ⁇ m , preferably between 5 ⁇ m and 120 ⁇ m .
  • the layer 34 is weldable and gives a tensile strength that can be more than 1300 MPa for a component 1 made of BTR 165. In the thermal diffusion process virtually no residues or emissions to the environment.
  • the coating process is concluded with a passivation process in an adjacent passivation station 35, in which the drums 31 are discharged from the coating installation 30, cooled in a cooling station 36, ultrasonically freed of residues of the coating powder in a cleaning station 37 and in a tempering station 38 at a temperature of about 200 ° C for about 1 h, wherein the layer 34 is passivated.
  • suitable passivating additives may also be added. Then the finished corrosion-protected components 1 can be removed from the drum 31.
  • FIGS. 3a to 3e 2 schematically show an alternative method sequence for producing a spatially shaped, press-hardened component 1 from a semifinished product 2, in particular from a circuit board 3.
  • a first process step (FIG. Fig. 3a ) the board 3 is cut in the blanking press 6 from a developed and straightened portion of a sheet metal coil 5 and stored on a stack 7.
  • the circuit board 3 is subjected to a hot-forming step ( Fig. 3b ).
  • the board 3 is inserted by a manipulator 20 'in a continuous furnace 21', in which the board 3 is heated to a temperature which is above the transition temperature in the austenitic microstructure state.
  • the heated board 3 is inserted into a hot forming tool 23 ', in which from the circuit board 3, a component blank 10' of the desired three-dimensional shape is formed;
  • the component blank 10 ' is cooled down so rapidly that it experiences a (component-wide or local) hardening.
  • the continuous furnace 21 'and the hot forming tool 23' are advantageously in a protective gas atmosphere 26 ', to prevent scaling of the boards 3.
  • the hardened component blank 10 ' is transferred to a cutting device 15' ( Fig. 3c ), in which the component blank 10 'is trimmed at the edge to produce a blank 18' with edge contour 12.
  • the trimming is preferably carried out with a laser 14 '.
  • the cut edge portions 11 ' are disposed of.
  • Figures 3d and 3e is the press-hardened and trimmed blank 18 '- analogous to the process stages V and VI of FIGS. 1e and 1f - subjected to a dry cleaning and coated in a coating system 30.
  • the press-hardened, coated component 1 is particularly suitable as a body component in vehicle construction, which is produced in large quantities.
  • the method according to the invention enables advantageous process control with short cycle times, all process steps have industrialization potential.
  • corrosion-precoated materials such as Usibor 1500 PC
  • conventional pre-forming can be used.
  • a conventional forming and trimming is possible even with high-strength materials, so that the expensive in large quantities laser cutting cost can be replaced.
  • Sheet metal components can be protected by this manufacturing method already in the development by conventional forming simulation on their production. Added to this is the corrosion protection, especially with zinc layers with the advantage of edge coating.
  • fuel consumption is reduced by reducing the weight of the components, since they can be much thinner than conventional sheet metal parts, while at the same time increasing passive safety since the components have very high strength ,

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (6)

  1. Procédé de fabrication de composants trempés moulés, en particulier d'un composant de carrosserie, à partir d'un produit semi-fini (2) en tôle d'acier non trempée, formable à chaud, une ébauche de composant (10) étant formée à partir du produit semi-fini (2) par un procédé de formage à froid, en particulier un procédé d'emboutissage, caractérisé par la mise en oeuvre des étapes de procédé suivantes :
    - l'ébauche de composant (10) est découpée du côté bord sur un contour de bordure (12'), correspondant approximativement au composant (1) à fabriquer ;
    - l'ébauche de composant (17) découpée est chauffée et trempée moulée dans un outil de formage à chaud (23) ;
    - l'ébauche de composant (18) trempée moulée est recouverte dans une étape de revêtement, en utilisant un procédé de diffusion thermique, d'une couche de protection (34) contre la corrosion.
  2. Procédé de fabrication de composants trempés moulés, en particulier d'un composant de carrosserie, à partir d'un produit semi-fini (2) en tôle d'acier non trempée, formable à chaud, caractérisé par la mise en oeuvre des étapes de procédé suivantes :
    - le produit semi-fini (2) est chauffé et trempé moulé dans un outil de formage à chaud (23) ;
    - l'ébauche de composant (10') trempée moulée, ainsi produite, est découpée du côté bord sur un contour de bordure (12') correspondant au composant (1) à fabriquer ;
    - l'ébauche de composant (18') découpée, trempée moulée, est recouverte dans une étape de revêtement, en utilisant un procédé de diffusion thermique, d'une couche de protection (34) contre la corrosion.
  3. Procédé selon l'une des revendications 1 et 2, caractérisé en ce que l'ébauche de composant (18, 18') trempée moulée est nettoyée par voie sèche avant l'étape de revêtement.
  4. Procédé selon la revendication 3, caractérisé en ce que l'ébauche de composant trempée moulée (18, 18') est grenaillée avant l'étape de revêtement par des particules, en particulier des particules de verre.
  5. Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que l'ébauche de composant (18, 18') revêtue est nettoyée après l'étape de revêtement de résidus de cette dernière.
  6. Procédé selon l'une au moins des revendications précédentes, caractérisé en ce que l'ébauche de composant (18, 18') revêtue est étuvée après l'étape de revêtement.
EP04739467.1A 2003-07-22 2004-05-29 Procédé de fabrication des éléments trempés à la presse Expired - Fee Related EP1646458B1 (fr)

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DE10333165A DE10333165A1 (de) 2003-07-22 2003-07-22 Pressgehärtetes Bauteil und Verfahren zur Herstellung eines pressgehärteten Bauteils
PCT/EP2004/005855 WO2005018848A1 (fr) 2003-07-22 2004-05-29 Élément trempé à la presse et procédé de fabrication associé

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DE10333165A1 (de) 2005-02-24
WO2005018848A1 (fr) 2005-03-03
US8141230B2 (en) 2012-03-27
EP1646458A1 (fr) 2006-04-19
US20120137502A1 (en) 2012-06-07

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