EP3329022A1 - Composant de carrosserie ou de châssis d'un véhicule automobile possédant une performance améliorée au crash-test et procédé de sa fabrication - Google Patents

Composant de carrosserie ou de châssis d'un véhicule automobile possédant une performance améliorée au crash-test et procédé de sa fabrication

Info

Publication number
EP3329022A1
EP3329022A1 EP16735810.0A EP16735810A EP3329022A1 EP 3329022 A1 EP3329022 A1 EP 3329022A1 EP 16735810 A EP16735810 A EP 16735810A EP 3329022 A1 EP3329022 A1 EP 3329022A1
Authority
EP
European Patent Office
Prior art keywords
chassis component
layer
surface portion
sheet metal
percent
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.)
Withdrawn
Application number
EP16735810.0A
Other languages
German (de)
English (en)
Inventor
Andreas Frehn
Georg Frost
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.)
Benteler Automobiltechnik GmbH
Original Assignee
Benteler Automobiltechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Publication of EP3329022A1 publication Critical patent/EP3329022A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D29/00—Superstructures, understructures, or sub-units thereof, characterised by the material thereof
    • B62D29/007—Superstructures, understructures, or sub-units thereof, characterised by the material thereof predominantly of special steel or specially treated steel, e.g. stainless steel or locally surface hardened steel
    • 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
    • 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
    • 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
    • B21D35/007—Layered blanks
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
    • B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
    • B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
    • B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
    • B60G21/051—Trailing arm twist beam axles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G21/00—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces
    • B60G21/02—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected
    • B60G21/04—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically
    • B60G21/05—Interconnection systems for two or more resiliently-suspended wheels, e.g. for stabilising a vehicle body with respect to acceleration, deceleration or centrifugal forces permanently interconnected mechanically between wheels on the same axle but on different sides of the vehicle, i.e. the left and right wheel suspensions being interconnected
    • B60G21/055—Stabiliser bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
    • B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
    • B60R19/03—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects characterised by material, e.g. composite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/02—Understructures, i.e. chassis frame on which a vehicle body may be mounted comprising longitudinally or transversely arranged frame members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D21/00—Understructures, i.e. chassis frame on which a vehicle body may be mounted
    • B62D21/15—Understructures, i.e. chassis frame on which a vehicle body may be mounted having impact absorbing means, e.g. a frame designed to permanently or temporarily change shape or dimension upon impact with another body
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/02—Side panels
    • B62D25/025—Side sills thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/04—Door pillars ; windshield pillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/06—Fixed roofs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • B62D25/20—Floors or bottom sub-units
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/54—Yield strength; Tensile strength
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/30—Iron, e.g. steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2605/00—Vehicles
    • B32B2605/08—Cars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/001—Austenite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite
    • 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
    • C21D2241/00—Treatments in a special environment
    • 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
    • C21D2251/00—Treating composite or clad material
    • C21D2251/02—Clad material

Definitions

  • the invention relates to a body or chassis component for a motor vehicle with improved crash performance and to a method for producing a body or chassis component with improved crash performance and corrosion protection.
  • crash-sensitive components are used for the body, which give the vehicle stability and rigidity and absorb crash energy in the event of an accident and provide the occupants with a survival space.
  • more components are used in the chassis of a motor vehicle, which in addition to stiffness and dynamic load especially high demands on a defined deformability but also to the economy.
  • One common method is the so-called thermoforming and press hardening of temperable steel grades with the steps of heating for austenitizing, hot working and quench hardening in a press mold. It is customary to provide as a temporary corrosion protection and anti-scaling during heating an aluminum-silicon coating on a heat-treatable steel sheet.
  • the object of the present invention is accordingly to propose improved bodywork or chassis components for a motor vehicle and their production methods in the crash properties, which nevertheless are inexpensive to manufacture, process and light.
  • the object is solved by the method by the features of claim 17.
  • the dependent claims 18 to 21 represent advantageous developments of the method. It is proposed a body or chassis component for a motor vehicle with improved crash performance comprising at least one surface portion of a multi-layer, in particular three-layer sheet metal composite with a central position and two outwardly limiting the center layer outer layers. According to the outer layers are connected flat and cohesively with the central layer.
  • Characteristic is that the outer layers of a stainless steel alloy with a microstructure selected from the group of ferritic, austenitic or martensitic microstructure and the middle layer of a heat treatable, especially hardened steel alloy, and the bodywork or chassis component a bending angle greater than 80 degrees (° ), determined in the platelet bending test according to VDA 238-100: 2010, at a yield strength Rp0.2 of greater than 900 MPa.
  • This allows a maximum of corrosion protection throughout the life of the vehicle, even under rough handling and operating conditions.
  • the softer outer layer which is firmly connected to the harder middle layer, causes the tendency for the crack to drop significantly during an intended load in the event of a crash, but also already during a joining or cold-forming operation following the component component.
  • connection between the outer layers and the middle layer takes place in a planar manner through a material bond such that there are essentially no inclusions or contaminants between the layers, wherein in particular a metallurgical connection is formed.
  • the individual layers are preferably bonded to one another in a material-bonded and metallurgical manner over the entire surface.
  • the starting material used for the invention can be produced, for example, by hot rolling three previously mechanically and / or materially prefixed connected slabs, or a multi-stage cast slab, or an order-welded slab.
  • the advantage of the ferric stainless steel alloy in combination with a hardenable, ferritic-pearlitic steel alloy of the middle layer is that the composition of the outer layer during the heat treatment with the middle layer forms a particularly homogeneous and durable cohesive connection. Even during structural transformation of the middle layer during thermoforming and press hardening, there is no danger of cracks, spalling or the like of the outer layer.
  • the heat treatable steel alloy of the middle layer ensures maximum tensile strength. Furthermore, reference should be made to the content of EN 10088-1 for further usable ferritic stainless steel alloys, with chromium contents of between 10.5% and 30% depending on the variety. To ensure weldability, stabilization additives of less than 0.5% of titanium, niobium or zirconium and limited to 0, 16% carbon content.
  • the bending angle of the body or chassis component is greater than 95 ° and the yield strength Rp0.2 greater 950 megapascals (MPa).
  • the bending angle is greater than 90 °, in particular greater than 100 °, preferably greater than 1 10 °.
  • the body or chassis component has a product of bending angle and yield strength Rp0.2 between 90,000 ° MPa (Megapascal degrees) and 180,000 ° MPa, resulting in an optimal performance for the case of a crash without special measures of the process control during or after thermoforming, without danger of cracks or even a component failure.
  • the middle layer of the surface section preferably has an ultra-high-strength microstructure, with at least 80 percent martensite.
  • the tensile strength Rm within the area section with a three-layer composite is greater than 1300 megapascals (MPa).
  • the middle layer of a surface portion has a structure selected from a group of tempered martensite with a share of at least 80 percent or a mixed structure with at least 70 percent levels of ferrite and perlite and residual martensite, retained austenite and / or bainite.
  • the percentages of the structural components relate to metallographically easily ascertainable area proportions.
  • the surface portion with the three-layer composite sheet on a total thickness and one of the outer layers has a thickness, wherein the thickness of one of the outer layers at least 3 percent and at most 15 percent, preferably 4 percent to 10 percent of the total thickness of this surface section corresponds.
  • total thickness is to be understood the sum of the thicknesses of the two outer layers and the middle layer in the respective surface sections.
  • the total thickness is preferably between 1 and 10 millimeters (mm), in particular between 1, 7 and 3.5 mm.
  • a thicker outer layer hardly brings any advantages under anticorrosive aspects, but significantly reduces the overall strength of the surface section.
  • the opposing outer layers preferably have the same thickness. But it is also possible that different thickness outer layers are formed in at least one surface portion, if this is necessary to be particularly well adapted to different crash or corrosion requirements on the inside and outside, for example, in a hollow body or chassis component.
  • a heat treatable steel alloy is particularly suitable a manganese-boron steel such as 16MnB5, but preferably 22MnB5 or alternatively 36MnB5.
  • recoverable steel alloys having a carbon content greater than or equal to 0.27% by weight may be used, for example MBW 1900. These would be too brittle for direct thermoforming and press hardening. Due to the outer layers, their processing by means of thermoforming and press hardening is also possible in a direct thermoforming process, thus without cold deformation.
  • Figure 1 shows the mechanical characteristics of tensile strength Rm, yield strength Rp0.2, elongation at break A30 and Figure 2 the bending angle of a body component according to the invention with a center of steel grade 22MnB5 and two outer layers of thickness of 5 percent of the total thickness of a ferritic stainless steel alloy.
  • the ferritic steel alloy used was X10CrAISi18.
  • Figures 3 and 4 show the results for a steel component of the trade name Usibor with double-sided aluminum-silicon coating according to the prior art. All components had a thickness of 2 millimeters.
  • the body or chassis component on a second surface portion of a three-layer sheet metal composite has a first middle layer of ultra-high-strength structure with at least 80 percent martensite, while the second surface portion has a second middle layer with a structure selected from a group of tempered martensite with a share of at least 80 percent or mixed structure with at least 70 percent Proportions of ferrite and perlite and residual amounts of martensite and / or retained austenite and / or bainite.
  • components can be produced with softer and more ductile surface sections.
  • the second surface portion is a three-layer sheet metal composite, and the first center layer and the second center layer each have a thickness, and the thickness of the first center layer is different from the thickness of the second center layer.
  • a particularly thick surface section can thus be arranged in zones of highest stress and load capacity or where a material reinforcement in the middle of a thinner surface section is required for joining, for example by means of rivet or screw.
  • the first surface portion may have an overall thickness which differs from the total thickness of the second or further surface portions by at least 10 percent, in particular between 20 and 100 percent.
  • the bodywork or chassis component has a second surface section or further surface sections made of a ferritic or martensitic or austenitic, stainless steel alloy.
  • the surface sections of the bodywork or chassis component can be butt welded to each other.
  • the bodywork or chassis component has a second surface portion of a ferritic steel alloy, in particular, the surface portions are in turn butt welded together.
  • the second surface portion or further surface portion may be selected from a low-alloy steel alloy or a multi-phase steel alloy, or a steel alloy having TWIP and / or TRIP properties.
  • a low-alloy steel alloy or a multi-phase steel alloy or a steel alloy having TWIP and / or TRIP properties.
  • the method for producing the chassis or body component of the second surface portion can be heated only to a temperature lower than the AC1 temperature to prevent scaling.
  • the body or chassis component on an edge, wherein the edge is embraced in an end face in the surface portion with three-layer composite sheet at least partially from the outer layer, such that the end face of the central layer is shielded from the environment by the outer layer.
  • the corrosion resistance is further improved.
  • Body or chassis components of a motor vehicle are particularly from the group door pillar, especially in the form of an A-pillar or center pillar, roof frame, sill, bumper cross member, side member, floor cross member and wishbone, trailing arm, wishbone, stabilizer, twist beam axles, axle, crash box , Door impact beams, tunnels selected for example transmission tunnel.
  • the use as a battery case for a traction battery of an electric or hybrid vehicle is possible.
  • the second surface section or another surface section with low tensile strength is arranged in each case in the edge.
  • the edge is ductile in this case and serves for the easier connectivity of connection components, strike plates, local reinforcements or other mechanical processing steps.
  • the procedural part of the invention is achieved by a method for producing a body or chassis component as described above, with the steps: Provision of a sheet-metal blank comprising at least one surface section of a three-layer sheet metal composite with a middle layer of a heat-treatable steel alloy and one outer layer each bounding the middle layer,
  • the heating is carried out within 30 seconds, preferably within 20 seconds, in particular within 10 seconds, which allows a space-saving, low-heat austenitization.
  • the heating is performed in cycles sequentially with the hot forming or the press cycle of a hot forming line.
  • the heating may comprise at least one holding phase. It can be heated without a protective gas atmosphere, since the outer layers have no tendency to mist.
  • a component trimming or a separation in particular a punching of the component after the hot forming and press hardening, is carried out only on the hardened component. This can then be done by a combined rolling and cutting or pressure cutting, in particular in one of the press tool stage subsequent tool stage of the press, but also outside in a separate operation. In this case, a part of the outer layer is displaced in the edge region in the front side of the separation area or hole edge and at the same time a slug or Verismerand is separated.
  • the outer layer of stainless steel alloy protects the central layer against environmental influences, in particular against entry of process-related molecular hydrogen during heating, and prevents the risk of embrittlement of the component caused by introduction of hydrogen.
  • the stainless steel outer layers are not crack-sensitive, unlike coated components. It is therefore very possible to cut these after press hardening in the cold and hard state.
  • the lower layer has no significant fraction fraction.
  • the cut edges are essentially free of grades due to the increased ductility of the outer layers.
  • the trimming can also be carried out in a separate cutting tool. In particular, the trimming is carried out completely. This means on final contour.
  • a crack-free surface is provided.
  • the cutting edge is provided largely free of cracks. They are preferred no cracks or microcracks larger than 10 m are present on the surfaces. A laser cut or complex hot cut can thus be omitted.
  • FIG. 1 a and b two application examples for body and chassis components according to the invention
  • Figure 2 shows a first embodiment of a three-layer sheet metal composite for a surface portion of the body or chassis component according to the invention
  • Figure 3 shows a body component according to the invention in modified
  • Figure 4 shows a second embodiment of a three-layer sheet metal composite for a surface portion of the body or chassis component according to the invention
  • FIG. 5 shows a third embodiment of a three-layer sheet-metal composite for a surface section of the body or chassis component according to the invention
  • FIG. 7 shows a fourth embodiment of a three-layer sheet-metal composite for a surface section of the body or chassis component according to the invention
  • FIG. 8 shows a fifth embodiment of a three-layered sheet metal composite for a surface section of the body or chassis component according to the invention
  • FIG. 9 shows a sixth embodiment of a three-layer sheet-metal composite for a surface section of the body or chassis component according to the invention
  • FIG. 10 shows a body or chassis component according to the invention in a marginal detail
  • Figure 1 1 a) a first process sequence for carrying out the production process according to the invention
  • FIG. 12 shows an alternative method sequence for carrying out the production method according to the invention
  • FIG. 14 a) and b) result images of a corrosion test for a) according to the invention
  • FIG. 1 shows two advantageous application examples for a body and chassis component 1 according to the invention, in each case in a plan view and cross-sectional representations.
  • Figure 1 a shows a center column 20 for the side structure of a motor vehicle, which is used between sill and roof frame and especially the Overall stability of the vehicle body and the Kollisionsenergyabbau and intrusion protection during a side impact serves.
  • FIG. 1 b illustrates a transverse link 30 of a wheel suspension of a motor vehicle chassis.
  • Both examples are body or chassis components 1 made of sheet metal, which were formed three-dimensionally by means of compression molding.
  • Both the center column 20 and the wishbone 30 comprise at least one surface portion 2 of a three-layer sheet metal composite 10 with, as Figure 2 shows in more detail, a central position 1 1 and two the center layer 1 1 outwardly bounding outer layers 12, 13, wherein the outer layers 12, 13 of a stainless, in particular ferritic steel alloy and the middle layer 1 1 consist of a heat-treatable steel alloy.
  • the tensile strength Rm within the area section 2 with a three-layered sheet metal composite 10 is more than 1300 MPa.
  • section B and C is indicated in each case a section, which is shown enlarged in the figure 2 and describes the structure of the three-layer sheet metal composite 10 in more detail.
  • Figure 2 shows a first embodiment of the three-layer sheet metal composite 10 for a surface portion 2 of the body or chassis component 1 according to the invention in sections in cross section.
  • a central position 1 1 of the surface portion 2 is bounded at its top in the image plane top 7 by an outer layer 12, and limited at its bottom in the center below 8 limited by a further outer layer 13.
  • the composite sheet 10 has a total thickness D2 and a thickness of the central layer Dm and a thickness Da of the outer layer 12.
  • the outer layers 12, 13 are both the same thickness here.
  • FIG. 3 shows a body component 1 according to the invention in the form of the center pillar according to FIG. 1 in a modified embodiment.
  • the center pillar 20 ' is formed of a first surface portion 2 with a three-layered Sheet metal composite 10 in an upper portion 21 of the center column 20 'and from a second surface portion 3 with a three-layer sheet metal composite 15 in a second portion 22 of the center column.
  • the second portion 22 of the center pillar 20 ' extends approximately to just below a door lock connection for a vehicle door (not shown).
  • a weld 40 is formed, wherein both surface portions 2, 3 are joined butting against each other, in particular in front of a three-dimensional molding to the body component 1.
  • section BB at the level of the weld 40 is indicated the section of Sheet metal composite 10, 5, which is considered in more detail in Figures 4 and 5.
  • FIG. 4 shows the construction of the sheet-metal composite according to FIG. 3, which has a central layer 16 of a low-alloy steel alloy and outer layers 17, 18 of a ferritic stainless steel alloy in the second surface section 3. About the weld both surface sections 2, 3 are connected together.
  • the outer layers 12, 13 of the first surface portion 2 correspond to the outer layers 17, 18 of the second surface portion 3 as in the case of the sheet metal composite according to Figure 2 here is a metallurgical connection between the central layer 1 1 and the outer layers 12, 13.
  • the outer layers 17 and 18 metallurgically and permanently firmly connected to the central layer 16.
  • This sheet metal composite has a uniform total thickness D2.
  • the second surface section 3 has a single homogeneous layer of a ferritic stainless steel alloy.
  • the outer layers 12, 13 of the first surface portion 2 correspond in terms of the material of the steel alloy of the second surface portion 3.
  • the two surface sections 2, 3rd are already welded together before shaping the bodywork or chassis component 1 and then together deformable.
  • the second surface portion 3 is arranged in the vehicle in the so-called dry area, thus outside of corrosion prone areas.
  • the second surface section 3 with Stainless, ferritic steel alloy is preferably heated below 700 ° C during heating of the sheet metal plate, so that a scale formation does not occur in this section.
  • another body or chassis component in addition to a B-pillar, can have, in addition to a three-layer sheet metal composite in a first surface section, a ductile, particularly corrosion-stressed second surface section made of a stainless steel alloy.
  • FIG. 6a shows a body component 1 according to the invention in the form of the center pillar according to FIGS. 1 and 3 in a modified embodiment.
  • the center pillar 20 "is formed from a first surface portion 2 with a three-layer sheet metal composite 10 in an upper portion 21 of the center column 20" and from a second surface portion 3 with a three-layer sheet metal composite 15 in a second portion 22 of the center column.
  • the second subregion 22 of the center pillar 20 "extends approximately to just below a door lock connection for a vehicle door (not shown) .
  • a transition region 41 is formed between the first surface section and the second surface section 3, wherein both surface sections 2, 3 in the individual layers each have the same material are formed in one piece or are welded analogously to the embodiment according to Figures 3 and 4. In the latter case, the transition region 41 of the weld can correspond in terms of their location.
  • the second surface portion 3 has in its central position 16, shown in Figure 7 to 9, a higher ductility and lower tensile strength than in the first surface portion 2, which counteracts a delayed cracking and associated problems in a side impact and a targeted deformation, in the case of Center column 20 "in a safe for the occupants area of the vehicle seat allowed.
  • FIG. 6b shows a center pillar 20 '' with a second surface section 3 which, in addition to the second section 22, also extends to a part of the edges 42 of the first, in the image plane upper portion of the center pillar 20 ''.
  • the center pillar 20 "' has a plurality of attachment points 43 for attachment to a vehicle sill Surface portion 3 in the second portion 22 extends a further surface portion 4, which in turn has a higher strength and less ductility compared to the second surface portion 3.
  • a further transition region 41 is formed between the two surface portions 2, 3, a further transition region 41 is formed.
  • section B-B the section is indicated, which is considered in more detail in Figures 7 and 9.
  • the first surface portion 2 has the central position 1 1, which is bounded by two outer layers 12 and 13 up and down.
  • the first surface portion 2 has a first center layer 1 1 of ultra high-strength structure with at least 80 percent martensite, which was adjusted by thermoforming and press hardening a heat treatable steel alloy, the tensile strength within the first surface portion with three-layer composite sheet is greater than 1300 MPa.
  • the body or chassis component 1 in the form of the center column 20 "or 20" ' has a second surface portion 3 of a three-layer sheet metal composite 15, wherein the second surface portion has a second center layer 16 with a structure selected from a group of tempered martensite a proportion of at least 80 percent or mixed structure with at least 70 percent shares of ferrite and perlite and residual amounts of martensite and / or retained austenite and / or bainite.
  • the surface sections 2, 3 correspond to each other in the individual layers, wherein the outer layers 12, 13, 17, 18 each consist of a ferritic stainless steel alloy.
  • a transition region 41 in the middle position between the first and the second center layer has a width B1 which is between 10 mm and 150 mm, but preferably below 50 mm, since there is a mechanically difficult to determine and inhomogeneous state in the transition region 41.
  • FIG. 8 shows a layer structure of an alternative embodiment of the invention. As before, this is a section to illustrate the relevant component properties in cross section.
  • a first surface portion 2 has the central position 1 1, which is bounded by two outer layers 12 and 13 up and down.
  • the first surface portion 2 has a first middle layer of ultra-high-strength structure with at least 80 percent martensite, wherein the tensile strength within the first surface portion 2 with three-layer sheet metal composite 10 is greater than 1300 MPa.
  • the body or chassis component 1 has a second surface section 3 made of the same material of the same three-layer sheet metal composite 15, the second surface section 3 having a second center layer 16 with approximately the same metallic microstructure.
  • the surface portions correspond to each other in the individual layers, wherein the outer layers 12, 13, 17, 18 each consist of a ferritic stainless steel alloy. It is also possible that the thickness jump is formed only on one side, for example on the top, the opposite bottom, however, is flat. This facilitates a later hot working, since a better tool contact is made. It also results in a flat welding level.
  • a transition region 44 between the first and the second surface portion 2, 3 has a width B2 which is between 50 millimeters (mm) and 250 mm, but preferably below 200 mm, since the coupling is difficult with other components in uneven sections. It can be seen that the total thickness D3 of the sheet metal composite 15 in the second surface portion 3 is greater than the total thickness D2 of the sheet metal composite 10 in the first surface portion 2, wherein the ratios of the thickness of the layers to each other within a composite sheet do not change.
  • the bodywork or chassis component 1 comprises further surface sections, which adjoin the second surface section and allow a further increase in the total thickness and thus a strengthening of the load-compatible construction.
  • the different thickness is preferably already present in the three-dimensional component geometry before the press forming.
  • FIG. 9 shows an alternative embodiment and a combination of the embodiments of FIGS. 7 and 8.
  • a first surface section 2 of total thickness D2 from a middle layer 11 and two outer layers 12 and 13 passes over a transition region 44 of width B2 into a second surface section 3 of the total thickness D3, wherein the second surface portion 3 in turn has a central layer 16 with a thickness Dm3 and two outer layers 17 and 18, and the central layer 16 has an ultra-high-strength structure with at least 80 percent martensite.
  • the middle layer 1 1 of the first surface section 2 has a ductile structure selected from a group of tempered martensite with a share of at least 80 percent and a mixed structure with at least 70 percent shares of ferrite and perlite and residual amounts of martensite and / or retained austenite and / or bainite.
  • transition region 41 of the width B1 which is formed only over part of the width B2 of the transition region 44.
  • the transition region 41 which is undefined in terms of its mechanical properties and its microstructure composition, is accordingly smaller than the transition region 44 characterized by its thickness discontinuity.
  • the result is a body or chassis component 1 with a very good load-bearing design potential with regard to a targeted deformation process, energy absorption capability and good coupling by welding, gluing , Rivets and / or screws to the vehicle body or other attachments.
  • FIG. 10 shows a detail of the cross-section of a body or chassis component 1 according to the invention with a three-layered sheet metal composite 10 with a rim 42.
  • the edge 42 is at least partially encompassed by an outer layer 12 in its face 9 in the surface section 2 with dreilagigem sheet metal composite 10, such that the end face 9 of the central layer 1 1 of the edge 42 from the environment U by the outer layer 12 and the outer layer 13 shielded is.
  • the outer layers limit as in the preceding embodiments, the central layer 1 1 on top in the image plane top 7 and on the underside located in the middle bottom 8.
  • 1 a shows a press 50 for carrying out the procedural part of the invention for the production of body or chassis components 1.
  • one or more sheet metal blanks 5 are provided, which comprise at least one surface section of a three-layer sheet metal composite with a middle layer of a heat-treatable steel alloy and two the central layer outwardly bound outer layers include.
  • the heating of the sheet metal composite takes place at least in sections on Austenitmaschinestemperatur in the press 50 by contact heating 51 by at least one heatable contact plate 56.
  • the contact plate 56 touched during the heating of the outer layers of the metal laminate of the sheet metal blank, wherein at least a surface portion of the sheet metal plate heated in the shortest time austenitizing becomes.
  • a transfer of the hot metal sheet takes place in an at least partially cooled mold 52 and the hot forming of the metal sheet 5 is carried out therein.
  • the sheet metal plate 5 is also already cooled slightly. If a previously homogeneously austenitized sheet metal blank 5 is formed in a partially heated die 52, a reduced cooling rate can optionally be effected in a second area section, so that the critical cooling rate for martensitic transformation of the structure in this second area section is excluded.
  • a trimming and perforation of the shaped but still uncured component can also take place.
  • Decisive advantage of the method according to the invention is that scaling or oxidation during heating and hot forming are excluded by the outer layers of ferritic or austenitic or martensitic stainless steel alloy and so a complex coating, final cleaning of the surface, surface defects and a Schutzgasumhausung the press or contact heating is avoided.
  • FIG. 12 shows a press 50 "for an alternative implementation of the procedural part of the invention for the production of body or chassis components 1.
  • one or more sheet metal blanks 5 are provided which comprise at least a first surface section of a three-day sheet metal composite with a middle layer of a heat-treatable steel alloy.
  • the heating of the sheet metal composite takes place in sections at Austenitmaschinestemperatur in the press 50 "by contact heating 51 between at least one heatable contact plate 56.
  • the two contact plates 56 shown here touches during heating the outer layers of the sheet metal composite of the sheet metal blank (not shown), wherein one or all surface portions of the sheet metal blank are heated in a very short time.
  • a transfer of the so-heated sheet metal plate takes place in a tempering 55, so that either the homogeneously heated metal sheet 5 is cooled down from an austenitizing temperature in a second surface portion to less than 700 ° C, or a surface portion is from less than 700 ° C to at least Austenitmaschinestemperatur heated.
  • the tempering stage may in turn have contact plates for heating and / or cooling, which are set by burners, inductors or resistance heating to the required temperature.
  • the sections of differently tempered sheet metal blank is introduced into a cooled die mold stage 52 and hot-forming the sheet metal blank is performed therein.
  • the sheet metal plate 5 is also already cooled slightly.
  • FIG. 13 a shows a further embodiment of the invention in the form of a cross-sectionally round body component 1 made of a sheet-metal plate or a sheet-metal strip in a plan view.
  • This is an A-pillar 25 with a curved in the image plane lower portion 22 and a straight wider in cross section upper portion 21st FIGS. 13b) to 13d) show various cross-sectional geometries that can be used for the A-pillar of FIG. 13a).
  • a weld 23 closes the formed as a hollow profile member 1 in a rim 42, 42 ', which extends in the axial direction of the component 1.
  • the component 1 has two edges 42 ', which contact each other in parallel and are coupled in a material-locking manner by the weld seam 23.
  • the edge represents a two-walled flange.
  • a rim 42 with its end face 9 is designed to make contact with a side face of a second edge 42 'and is joined in a material-bonded manner to a weld seam 23.
  • the edge 42 ' represents a single-walled flange.
  • FIG. 13d shows the result of a corrosion test after 48 hours in Salzsprüriolum bathuch for a press-hardened steel sheet made of Usibor material. A corrosion progress can be recognized over the surface of the component and in the edges.
  • Figure 14b shows the result of a corrosion test after 1000 hours for press-hardened steel sheet according to the invention. You can see a strong corrosion progress only in the edges.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
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  • Body Structure For Vehicles (AREA)

Abstract

L'invention concerne un composant de carrosserie ou de châssis (1) pour un véhicule automobile, comprenant au moins une section plate (2, 3) constituée d'une tôle composite tricouche (10) ayant une couche médiane (11) et deux couches extérieures (12, 13) délimitant vers l'extérieur la couche médiane (11), qui sont reliées sur toute la surface et par liaison de matières à la couche médiane, caractérisé en ce que les couches extérieures (12, 1) sont constituées d'un alliage d'acier inoxydable ayant un squelette choisi dans le groupe des squelettes ferritiques, austénitiques ou martensitiques et la couche médiane (11) d'un alliage d'acier apte au traitement de trempe et de revenu, et en ce que le composant de carrosserie ou de châssis présente un angle de courbure supérieur à 80°, déterminé dans l'essai de flexion d'une plaque d'après la norme VDA 238-100, à une limite d'allongement Rp0,2 de plus de 900 MPa.
EP16735810.0A 2015-07-28 2016-05-12 Composant de carrosserie ou de châssis d'un véhicule automobile possédant une performance améliorée au crash-test et procédé de sa fabrication Withdrawn EP3329022A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015112327.4A DE102015112327A1 (de) 2015-07-28 2015-07-28 Karosserie- oder Fahrwerkbauteil eines Kraftfahrzeuges mit verbesserter Crashperformance sowie Verfahren zu dessen Herstellung
PCT/DE2016/100223 WO2017016535A1 (fr) 2015-07-28 2016-05-12 Composant de carrosserie ou de châssis d'un véhicule automobile possédant une performance améliorée au crash-test et procédé de sa fabrication

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EP3329022A1 true EP3329022A1 (fr) 2018-06-06

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EP16735810.0A Withdrawn EP3329022A1 (fr) 2015-07-28 2016-05-12 Composant de carrosserie ou de châssis d'un véhicule automobile possédant une performance améliorée au crash-test et procédé de sa fabrication
EP16735811.8A Not-in-force EP3328643B1 (fr) 2015-07-28 2016-05-12 Pièce de véhicule à moteur en acier composite tricouche

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EP16735811.8A Not-in-force EP3328643B1 (fr) 2015-07-28 2016-05-12 Pièce de véhicule à moteur en acier composite tricouche

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US (2) US20180370578A1 (fr)
EP (2) EP3329022A1 (fr)
CN (2) CN107922990A (fr)
DE (1) DE102015112327A1 (fr)
WO (2) WO2017016536A1 (fr)

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DE102015112327A9 (de) 2017-04-06
US20180222536A1 (en) 2018-08-09
DE102015112327A1 (de) 2017-02-02
US20180370578A1 (en) 2018-12-27
CN107922990A (zh) 2018-04-17
EP3328643A1 (fr) 2018-06-06
CN108472929B (zh) 2020-09-08
EP3328643B1 (fr) 2019-04-17
WO2017016535A1 (fr) 2017-02-02
WO2017016536A1 (fr) 2017-02-02
CN108472929A (zh) 2018-08-31

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