EP3056591A1 - Verfahren zum herstellen eines erzeugnisses aus gewalztem bandmaterial - Google Patents

Verfahren zum herstellen eines erzeugnisses aus gewalztem bandmaterial Download PDF

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Publication number
EP3056591A1
EP3056591A1 EP16154396.2A EP16154396A EP3056591A1 EP 3056591 A1 EP3056591 A1 EP 3056591A1 EP 16154396 A EP16154396 A EP 16154396A EP 3056591 A1 EP3056591 A1 EP 3056591A1
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EP
European Patent Office
Prior art keywords
coating material
substrate
coating
metallic
strip material
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.)
Ceased
Application number
EP16154396.2A
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German (de)
English (en)
French (fr)
Inventor
Wolfgang Eberlein
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.)
Muhr und Bender KG
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Muhr und Bender KG
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Filing date
Publication date
Application filed by Muhr und Bender KG filed Critical Muhr und Bender KG
Publication of EP3056591A1 publication Critical patent/EP3056591A1/de
Ceased legal-status Critical Current

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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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/201—Work-pieces; preparation of the work-pieces, e.g. lubricating, coating
    • 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
    • B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
    • B21D35/005—Processes combined with methods covered by groups B21D1/00 - B21D31/00 characterized by the material of the blank or the workpiece
    • 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
    • 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
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • 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
    • C21D8/0478—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 particular surface treatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C25D7/0621—In horizontal cells

Definitions

  • the invention relates to a method for producing a product of rolled strip material comprising the steps of: providing a substrate as strip material made of sheet steel; Rolling the substrate as a strip material; electrolytically coating the substrate with a first metallic coating material, wherein the electrolytic coating occurs after rolling; Applying a second coating material as an anti-scale coating to the substrate coated with the first coating material; Hot working the substrate, wherein the hot working is done after the application of the second coating material.
  • the invention further relates to a product made by the process of rolled strip material.
  • Hot dip galvanizing is understood to mean the coating of steel parts with a solid, metallic zinc coating by immersing the pretreated steel parts in a molten liquid zinc melt.
  • electrolytic galvanizing the workpieces are immersed in a zinc electrolyte.
  • Zinc electrodes act as "sacrificial anodes" due to their less noble metal than the workpiece.
  • the workpiece to be galvanized acts as a cathode, which is why the coating is also referred to as cathodic corrosion protection.
  • the publication AT 412 403 B relates to a method for producing a corrosion-protected steel sheet and a corrosion-protected with a coating
  • it is intended to apply at least one electrolytically produced zinc layer and at least one layer consisting of aluminum to a sheet metal surface in a first step, after which the sheet is selectively heated and cooled in a second step.
  • the corrosion-protected steel sheet or an article formed therefrom has a surface layer of greater than 0.1 mass% and less than 5.0 mass% aluminum, the layer being formed of two iron-zinc-aluminum intermetallic phases.
  • a method of manufacturing a flexible rolled strip material product comprising the steps of: providing a steel sheet strip material; flexibly rolling the strip material creating a variable thickness over the length of the strip material; electrolytic coating with a metallic coating material containing at least 93% by weight of zinc, the electrolytic coating taking place after the flexible rolling; Heat treating at temperatures greater than 350 ° C and below a solidus line of the coating material, wherein the heat treatment is carried out after the electrolytic coating; Working out a board from the flexibly rolled strip material; and cold or hot forming the board.
  • a thermal diffusion treatment eg in a bell annealer, is carried out to allow direct hot forming. If the iron content is too low, direct hot-forming may otherwise cause the effect of solder cracking.
  • the iron-rich intermetallic phases are brittle and tend under mechanical stress, such as by bending, to cracks that can continue into the cured material, thus resulting in a disadvantageously large bending angle according to test specification VDA 238-100 of the material.
  • a further disadvantage is that zinc has a low vapor pressure and is therefore to be expected in the case of thermal diffusion treatments or subsequent heating in the course of hot forming with zinc losses.
  • the near-surface, zinc-rich regions of the galvannealing coating are increasingly prone to evaporation, which is reflected in only a slight increase in layer thickness after hot working and a high iron content in the layer.
  • An object of the present invention is to propose a method for producing a product of flexibly rolled strip material or a product of flexibly rolled strip material, in which a heat treatment prior to the hot forming for the purpose of alloying can be dispensed with.
  • the second coating material is provided as a composition with metallic constituents.
  • metallic constituents are constituents of elements which belong to the metals and / or optionally to the semimetals.
  • the metallic constituents may be present as pure substances or as an alloy.
  • the composition of the second coating material is chosen such that the metallic constituents predominantly consist of elements which are less noble than the steel sheet of the substrate in order to provide cathodic corrosion protection.
  • This weight specification should be understood in the sense of customary terminology and may refer in particular to the mass of the second coating material before application to the substrate or to the mass of the second coating material after application to the substrate.
  • the elements which are less noble than the steel sheet of the substrate and which are preferably used at least one of the elements aluminum and magnesium belongs.
  • the cathodic protection against corrosion can be achieved particularly advantageously, since the addition of elements which are less noble than the steel sheet of the substrate in the first coating material is avoided and, moreover, no separate process step for heating between the coating and the hot forming is necessary ,
  • a further advantage of the coating produced by the method according to the invention is that in the course of the final hot working, a reduction in strength is achieved in the boundary region between the coating and the substrate, so that the boundary region has an increased ductility compared to the hardened substrate.
  • a required by the prior art step of the edge decarburization can be omitted by a corresponding alloy composition of the coating is selected.
  • the process time for producing the product can be shortened, which has a favorable effect on the manufacturing costs.
  • a separate process step for heating the product between the coating and the hot forming is preferably not provided in the inventive method.
  • substrate referred to in the context of the invention, both a steel strip, as well as rectangular blanks or shape cuts, which are obtained from a rolled steel strip by cutting, mechanically or by laser cutting.
  • the blanking is preferably carried out after the second coating step and before hot working.
  • the cutting can also take place after the rolling and before the first coating step, so that the coating is already carried out as general cargo processing of the sinkers.
  • a strip material for rolling can Hot strip or cold strip are used, these terms are to be understood in the meaning of the language.
  • hot strip is meant a rolled steel finished product (steel strip) produced by rolling after preheating.
  • cold strip is meant a cold-rolled steel strip (flat steel) in which the last thickness decrease takes place by rolling without prior heating.
  • the rolling of the substrate is performed as a flexible rolling, wherein a variable thickness over a length of the strip material is generated.
  • the inventive method is particularly well suited for flexibly rolled strip material, since the thinner rolled substrate sections have increased ductility in the boundary region between the coating and the steel substrate, which in turn leads to a reduced microcracking.
  • any technically meaningful form of production of blanks from the strip material is meant by elaboration.
  • the method according to the invention it is advantageous that in the course of heating to a temperature above Ac1, that is, the temperature at which the formation of austenite begins, alloy formation between the coating, consisting of the first, electrodeposited coating material and the second coating material as a scale protection layer, and the steel substrate takes place.
  • the alloy formed has a hardness which is at least 50 HV below the core hardness of the hardened steel substrate during a press hardening process.
  • the coating thus has an increased ductility.
  • microcracks that can form in the course of the hot forming on the surface, avoided by the plastic deformation in the ductile coating and the adjacent alloy layer, which allows a local voltage reduction.
  • composition of the second coating material is chosen such that the metallic constituents consist predominantly of elements which are less noble than the steel sheet of the substrate in order to provide cathodic corrosion protection.
  • metallic particles can be introduced into the scale protective lacquer layer which are not electrodepositable, such as e.g. Particles of the elements aluminum and / or magnesium.
  • a diffusion barrier e.g. By adding aluminum to the coating, it is achieved that, in contrast to a pure zinc-iron alloy during austenitizing, further enrichment with iron is prevented, which avoids a reduction of the corrosion protection potential compared to a pure zinc coating after hot working.
  • the composition of the second coating material is selected such that the metallic constituents have a proportion of metallic particles, wherein the proportion of metallic particles, based on the total metallic constituents of the second coating material, in particular at least 5 percent by mass and at most 95 Percent by mass.
  • the metallic particles contained in the second coating material, the anti-scale paint have cathodic protection against the steel substrate.
  • the coating tends only to a small extent for oxidation or evaporation.
  • the proportion of metallic particles particularly preferably comprises particles of one or more of the carbide-forming elements titanium, niobium and vanadium.
  • the proportion of metallic particles may comprise particles of one or more of the ferrite-forming elements chromium, aluminum, titanium, tantalum, molybdenum, vanadium and silicon.
  • the metallic particles can also Contain particles of a semi-metal, such as silicon here, provided that the corresponding properties of the semi-metal are present.
  • the metallic particles preferably have a particle size of at least 100 nanometers and at most ten micrometers.
  • the first coating material preferably has zinc with a mass fraction of at least 50 percent, in particular at least 80 percent, although pure zinc can also be used as coating material.
  • the mass fraction is to be understood in particular in the sense of customary terminology and refers in particular to the mass distribution in the coated state or before coating.
  • the hot forming is carried out as an indirect process with the following substeps: cold preforming of the substrate; Heating at least a portion of the cold preformed member from the substrate to an austenitizing temperature; Thermoforming of the component to produce a final contour.
  • the hot forming is carried out as a direct process with the following substeps: heating at least a portion of the substrate to an austenitizing temperature; Thermoforming the substrate to produce a final contour.
  • blanks or shaped cuts are produced from the preferably flexibly rolled strip material, which can be carried out, for example, by mechanical cutting or by laser cutting.
  • Under sinkers are understood in particular rectangular metal sheets that have been cut out of the strip material.
  • Form cuts are understood to be sheet metal elements that have been worked out from the strip material and whose outer contour has already been adapted to the shape of the end product.
  • the term board is used uniformly for both rectangular and shaped sections.
  • Hot forming means forming processes in which the Workpieces are heated to a temperature in the range of hot forming prior to forming.
  • the heating is carried out in a suitable heating device, for example an oven.
  • the hot working is carried out after the first possibility as an indirect process comprising the substeps cold preforming the blank to a preformed component, then heating at least portions of the cold pre-formed component to austenitizing temperature and then hot working to produce the final contour of the product.
  • Austenitizing temperature is to be understood as meaning a temperature range in which at least partial austenitization is present, that is to say a microstructure in the two-phase region ferrite and austenite.
  • the hot forming according to the second possibility can also be carried out as a direct process, which is characterized in that at least portions of the board is heated directly to Austenitmaschinestemperatur and then hot-formed into the desired final contour in one step. A previous (cold) preforming does not take place here.
  • partial hardening can be achieved by austenitizing partial areas.
  • hardening of subareas of the components is also possible by means of tools of different temperatures, or by using a plurality of tool materials which enable different cooling rates. In the latter case, the entire board or the entire component can be completely austenitized before hot forming.
  • a ductile alloy layer of elements of the substrate, the first coating material and the second coating material is produced, wherein the ductile alloy layer with respect to the substrate has an increased ductility.
  • an outer alloy layer of elements of the first coating material and the second coating material is produced in the course of the hot forming in an interface between the first coating material and the second coating material.
  • the ductile alloy layer is produced in particular from elements of the substrate and the outer alloy layer.
  • the solution of the above-mentioned object further consists in a product of in particular flexibly rolled strip material made of sheet steel with a coating of a first coating material and a second coating material, prepared according to the inventive method described herein.
  • a product of in particular flexibly rolled strip material made of sheet steel with a coating of a first coating material and a second coating material prepared according to the inventive method described herein.
  • FIG. 1 shows a method according to the invention for producing a product of preferably flexibly rolled strip material 2.
  • the Strip material 2 which is also generally referred to as substrate 2 and wound on a coil 3 in the initial state, is rolled, preferably by means of flexible rolling.
  • the strip material 2 which has a largely constant sheet thickness over the length before the flexible rolling, rolled by means of rollers 4, 5 such that it receives along the rolling direction a variable sheet thickness.
  • the process is monitored and controlled using the data obtained from a sheet thickness measurement 6 as an input to control the rolls 4, 5.
  • the strip material 2 has different thicknesses in the rolling direction.
  • the strip material 2 is rewound to the coil 3 after the flexible rolling, so that it can be fed to the next process step.
  • the strip material 2 is smoothed in method step V2, which takes place in a strip straightening device 7.
  • the smoothing step is optional and may be omitted.
  • the strip material 2 After flexible rolling (V1) or smoothing (V2), the strip material 2 is provided with a first coating material 1 in method step V3.
  • the strip material 2 passes through an electrolytic strip coating device 8.
  • the strip coating takes place in a continuous process, that is, the strip material 2 is unwound from the coil 3, passes through the coating device 8 and is wound up again to the coil 3 after coating. This procedure is particularly favorable since the handling effort for applying the first coating material to the strip material 2 is low and the process speed is high.
  • a dip tank 9 can be seen, which is filled with an electrolytic liquid 10, which passes through the strip material 2.
  • the electrolytic coating is carried out in the present process with a metallic first coating material, which preferably contains zinc. Due to a high zinc content, a particularly good corrosion resistance is achieved. Prefers it is envisaged that the zinc content is 100% (pure zinc).
  • a metallic first coating material which preferably contains zinc. Due to a high zinc content, a particularly good corrosion resistance is achieved.
  • the zinc content is 100% (pure zinc).
  • anodes (not shown) made of zinc which emit zinc ions to the electrolyte 10 when energized can be used for the coating.
  • the zinc ions are deposited on the strip material 2, which is connected as a cathode, as zinc atoms and form a zinc layer.
  • inert anodes and a zinc electrolyte can also be used.
  • the strip material 2 wound up to the coil 3 is provided with a second coating material 15 in method step V4, the second coating material 15 having a composition with metallic constituents.
  • the second coating material 15 is provided as a composition with metallic components.
  • the composition of the second coating material 15 is chosen in particular such that the metallic constituents consist predominantly of elements which are less noble than the steel sheet of the substrate 20 in order to provide cathodic corrosion protection.
  • the second coating material 15 may be a scale protection varnish 15 with a high content of metallic constituents.
  • the metallic constituents may be present in the form of particles in the base material of the scale protection lacquer 15, wherein the metallic particles may contain titanium, niobium and / or vanadium.
  • the metallic particles contained in the second coating material 15 can react with the steel material of the substrate 2 to a depth of, for example, 100 micrometers. Thereby, a ductile intermediate layer is formed between the electrolytic coating 1, that is, the first coating material, and the steel substrate 2.
  • the scale protection varnish 15 can be applied to the electrodeposited layer of the first coating material 1, for example by coil coating, spray painting, brushing, etc.
  • the scale protection varnish 15 is supplied from a reservoir of an applicator roll 16 and applied.
  • a baking of the paint 15 take place.
  • another advantage of the scale protection layer is that the surface has a high quality.
  • by the scale protection of the coefficient of friction during hot forming and the heat absorption behavior are positively influenced.
  • Another advantage of the scale protection is that the adhesion of the underlying cathodic anti-corrosion layer is improved.
  • the strip material 2 is worked out in the next method step V5 from the strip material 2 individual sheet metal blanks 20.
  • the working out of the sheet metal blanks 20 from the strip material 2 is preferably carried out by means of punching or cutting. Depending on the shape of the sheet metal blanks 20 to be produced, these can be punched out of the strip material 2 as a shaped cut, wherein an edge remains standing on the strip material, which is not used further, or the strip material 2 can be easily cut into sections.
  • a sheet metal blank 20 machined out of the strip material 2, which can also be referred to as three-dimensional sheet metal blanks (3D-TRB), is shown schematically.
  • the term substrate is used for both the strip material 2, as well as for the board 20.
  • the boards 20 After the production of the board 20 from the strip material 2 takes place in the method step V5, a forming of the board 20 to the desired end product. After a first possibility, the boards 20 are directly hot-formed or, in a second possibility, hot-formed indirectly.
  • Hot forming can be done as a direct or indirect process.
  • the boards 20 are heated to austenitizing temperature prior to forming, which can be done, for example, by induction or in an oven.
  • Austenitizing temperature is to be understood as meaning a temperature range in which at least partial austenitization (microstructure in the two-phase region ferrite and austenite) is present. However, it is also possible to austenitize only portions of the board in order, for example, to allow partial hardening. After heating to Austenitmaschinestemperatur the heated board is formed in a forming tool 14 and simultaneously cooled at a high cooling rate, the component 20 receives its final contour and is cured at the same time.
  • the board 20 is subjected to preforming prior to austenitizing.
  • the preforming takes place in a cold state of the board, that is without prior heating.
  • preforming receives a profile that does not yet correspond to the final shape, but is approximated to this.
  • austenitizing and thermoforming then take place, as in the direct process, whereby the component receives its final contour and is hardened.
  • the steel material provided that hot working (direct or indirect), should contain at least 0.1% to 0.35% by weight of carbon.
  • the strip material may be provided with an intermediate layer prior to the electrolytic coating, in particular with a nickel, aluminum or manganese layer. This intermediate layer provides additional surface protection and improves the adhesion of the subsequently applied zinc-containing coating.
  • process control according to the invention can also be modified in the order of the steps performed.
  • the working out of boards can also take place elsewhere, for example before the electrolytic coating. If necessary, finally, blasting of the produced component can be provided.
  • FIGS. 2 and 3 schematically show the layer structure of the product, consisting of the substrate 2, 20 in the form of the strip material 2 or the board 20, the first, electrolytic coating material 1 and the second coating material 15 in the form of a scale protective lacquer.
  • the layer structure is shown before the hot forming (V6), which is described below with the layer structure after hot working (V6) according to FIG. 3 is compared.
  • V6 the layer structure after hot working
  • FIGS. 2 and 3 are separate phases of the three layers steel substrate 2, 20, first, electrolytic Coating material 1 and second coating material 15 in the form of a scale protection paint.
  • the representation is not to scale.
  • FIGS. 2 and 3 Markings marked are marked.
  • the austenitization in process step V6 results in alloy formation at the respective boundary surfaces of the layers.
  • This alloy 18 forms a further alloy 17 with the steel substrate 2, 20, which has a lower hardness after hardening than that hardened steel substrate 2, 20. This leads advantageously to an increased bending angle.
  • Typical layer thicknesses prior to step V6 are two to twenty micrometers for the scale protection varnish 15 and two to ten micrometers for the electrolytic zinc coating 1.
  • the layer thickness after curing in step V6 may be four to thirty micrometers for the alloy layer 18 of electrolytic zinc coating 1 and scale protective varnish 15.
  • the layer thickness for the ductile alloy layer 17 made of anti-scale paint 15, electrolytic zinc coating 1 and steel substrate 2, 20 can be two to fifty micrometers.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
EP16154396.2A 2015-02-13 2016-02-05 Verfahren zum herstellen eines erzeugnisses aus gewalztem bandmaterial Ceased EP3056591A1 (de)

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DE102015202642.6A DE102015202642A1 (de) 2015-02-13 2015-02-13 Verfahren zum Herstellen eines Erzeugnisses aus gewalztem Bandmaterial

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EP3056591A1 true EP3056591A1 (de) 2016-08-17

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JP2016176142A (ja) 2016-10-06

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