EP3925716B1 - Verfahren zum presshärten von warmumformbaren platinen - Google Patents

Verfahren zum presshärten von warmumformbaren platinen Download PDF

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Publication number
EP3925716B1
EP3925716B1 EP21172665.8A EP21172665A EP3925716B1 EP 3925716 B1 EP3925716 B1 EP 3925716B1 EP 21172665 A EP21172665 A EP 21172665A EP 3925716 B1 EP3925716 B1 EP 3925716B1
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EP
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Prior art keywords
blank
temperature
intermediate cooling
heated
tool
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Active
Application number
EP21172665.8A
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German (de)
English (en)
French (fr)
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EP3925716A1 (de
Inventor
Seyed Amin MOUSAVI RIZI
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Bilstein GmbH and Co KG
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Bilstein GmbH and Co KG
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • 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
    • 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
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/10—Die sets; Pillar guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/16—Heating or cooling
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • 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
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • C21D9/0018—Details, accessories not peculiar to any of the following furnaces for charging, discharging or manipulation of charge
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0062—Heat-treating apparatus with a cooling or quenching zone
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • 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
    • B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • 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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron

Definitions

  • the invention relates to a method for press-hardening blanks made from hot-workable steel. It is known in the prior art to separate blanks, for example from a steel strip, and then to introduce these blanks successively into a furnace in which the individual blanks are heated to the austenitizing temperature or somewhat higher. After the blanks have been appropriately heated, they are placed in a forming and press-hardening tool. The formed component is then removed from the tool and stored, for example.
  • coated circuit boards which have, for example, an anti-corrosion coating, in particular an Al-Si coating, a zinc coating or a coating of a non-metallic protective lacquer (X-tec).
  • an anti-corrosion coating in particular an Al-Si coating, a zinc coating or a coating of a non-metallic protective lacquer (X-tec).
  • Such coatings serve to prevent scale formation during heating and prior to the forming step.
  • Another disadvantage is that an anti-corrosion coating may result in hydrogen embrittlement of the circuit boards.
  • the invention is based on the object of creating a method of the generic type which can be used cost-effectively in order to produce press-hardened formed parts.
  • the invention proposes that the intermediate cooling takes place while avoiding the ingress of oxygen to avoid scale formation and that the blank is introduced into the mold within a few seconds and before further cooling to the martensite start temperature after the intermediate cooling.
  • the material is heated to the austenitizing temperature without the ingress of oxygen.
  • the blank which has been heated to the austenitization temperature, is cooled to a temperature below the austenitization temperature but above the martensite start temperature while further avoiding the ingress of oxygen.
  • the blank is then introduced into the hot-forming tool, formed and press-hardened in the latter, immediately within a very short time, ie within a few seconds, for example from one to five seconds, after leaving the cooling zone.
  • the procedure according to the invention therefore shortens the heating time to the austenitizing temperature. Also, the uncoated material is cheaper to obtain than coated material, and a The problem of hydrogen embrittlement does not arise here.
  • This proposal differs from the proposal according to claim 1 only insofar as claim 1 is based on a bare, uncoated circuit board, whereas, according to claim 2, this bare, uncoated circuit board is partially or completely formed, so that a corresponding molded part is formed from the circuit board material. This molded part is then treated according to the further process features.
  • the advantages given in relation to the first solution also apply to the second solution.
  • Heating with gas is preferred, but heating with electricity is also possible.
  • Corresponding current-operated heating units are known in the prior art.
  • the blank is heated inductively or conductively, optionally also upstream of the continuous furnace.
  • This procedure is easy to control and leads to a high degree of certainty in avoiding scale formation.
  • the temperature can thus be set in the desired range in a simple manner so that it is at least below 750° C. in order to avoid scale formation, but on the other hand is set considerably above the martensite start temperature so that forming and press hardening is possible.
  • the continuous furnace can be designed, for example, as a roller hearth furnace.
  • the transport from the continuous furnace into the intermediate cooling takes place without the ingress of oxygen, for example by a connecting channel connecting these two units with one another, so that the Access of atmospheric oxygen is prevented and the protective gas atmosphere can be maintained.
  • the continuous furnace and/or the intermediate cooling system is or are protected against the ingress of air on the inlet side and outlet side by means of locks that are arranged in each case.
  • Such sluices largely prevent the ingress of air when blanks are brought into the units or transported out of them.
  • parts of the circuit board are cooled for different periods of time or are exposed to the cooling inert gas atmosphere in order to produce areas with different technical properties or mechanical properties.
  • the transport speed of the blank is controlled for the purpose according to claim 14 .
  • the plate made of steel of quality 22MnB5 or equivalent is used.
  • This residual deformation can vary depending on the component.
  • the circuit board consists of a rectangular metal sheet.
  • the circuit board consists of a pre-cut sheet metal part.
  • a sheet metal part is cut out of a rectangular blank, which then represents the further blank, which is treated according to the method.
  • holes, recesses, contours or other processing are introduced into the blank, specifically before or after one of the pressing processes.
  • Corresponding components often have relevant holes as recesses and contours or also processings, these can also be introduced into the board either before or after the pressing processes.
  • One possible procedure is that the board is formed at room temperature.
  • a possibly advantageous variant is that the blank is formed at a temperature that is higher than room temperature in order to improve the forming properties, with the temperature being increased by heating the blank and/or the forming tool.
  • Forming at temperatures higher than room temperature may lead to better forming properties.
  • both the circuit board and the corresponding tool can be heated for the purpose of increasing the temperature.
  • An alternative, possibly advantageous procedure is that the blank is formed at a temperature that is lower than room temperature, with the temperature reduction of the blank and/or the forming tool taking place.
  • the temperature is reduced by cooling with nitrogen, optionally liquid nitrogen.
  • the material from which the circuit board is preferably made cannot only be 22MnB5 or a comparable material.
  • the analysis can also be optimized for an existing material in order to adapt it to the process flow.
  • the C content, the Mn content, or the B content can be adjusted accordingly, as well as other alloying elements.
  • Another special feature of the process is that the plate made of tailored blanks material with varying material thicknesses is used.
  • So-called tailored blanks material is known in the prior art.
  • blanks are rolled from a starting material to a different thickness and then blank pieces with different material thicknesses are connected to one another, in particular welded and further processed.
  • Such materials can also be used for the method according to the invention.
  • a further possibility is that the plate made of flexibly rolled material with changing material thickness is used.
  • Such flexibly rolled material is also known in the prior art.
  • strip material is rolled out to different thicknesses and then divided into blanks, so that the blanks do not have a uniform sheet thickness, but rather have different sheet thicknesses.
  • This material can also be used advantageously for the purposes according to the invention.
  • a special feature is that the circuit board is fully or partially inserted from thin material of 1.5 mm or less.
  • Another special feature is that the blank is heated in the heating zone for less than 5 minutes in order to avoid or minimize grain coarsening.
  • the microstructure of the material of the circuit board can be optimized according to the invention by adjusting the temperature and time. As a result, coarsening of the grain can be prevented and it is possible to react better to customer requests if a customer-specific structure/grain size is to be set.
  • the only drawing figure shows a basic system for carrying out the method according to the invention.
  • a blank 1 is transported in the direction of movement arrows 2 through a heating zone designated 3, in which the blank is continuously or discontinuously at least partially, preferably completely, heated to at least the austenitization temperature or slightly above, in the exemplary embodiment to about 1000°C .
  • the blank 1 is uncoated steel material made from hot-workable steel. Here, the passage of oxygen is prevented during the heating in the heating zone 4 to the austenitization temperature.
  • the on The blank 1, which has been heated to the austenitization temperature is cooled in an intermediate cooling zone 4 to a temperature below the austenitization temperature but above the martensite start temperature, for example to 600° C., further avoiding the ingress of oxygen.
  • the blank 1 is then introduced into the forming tool 5 within a few seconds of leaving the cooling zone 4 .
  • the temperature in the example is about 550°C.
  • the blank 1 is formed in the forming tool 5 and press-hardened at least in partial areas. The formed blank 1' can then be removed from the forming tool 5 and stored elsewhere.
  • the forming tool 5 is illustrated only schematically in the drawing. It consists of an upper part and a lower part. According to the arrow 6, these two parts can be approached and removed from one another. With the tool open, the circuit board 1 can be inserted and by closing the tool, the circuit board 1 can be formed and press-hardened. After the forming tool 5 has been opened, the blank 1' can be removed in the formed form.
  • the unit in the heating zone 3 is, for example, a continuous furnace or a roller hearth furnace, into which the blank is introduced through a lock that protects against the ingress of air, and is removed at the end through a further lock.
  • a lock can be provided at the entry and a lock at the exit to prevent air from entering be.
  • the continuous furnace, which forms the heating zone 3 is preferably heated with gas, with the heating in the continuous furnace taking place under a protective gas atmosphere in order to avoid scaling of the board.
  • the blank 1, which has been heated to the austenitization temperature enters the intermediate cooling zone 4 under a protective housing, with the ingress of oxygen or air again being avoided.
  • the intermediate cooling 4 can be implemented, for example, in the form of a lead bath.
  • the temperature of the blank can be cooled down to approx. 600° C., in any case remaining well above the martensite start temperature, so that forming and press hardening can be carried out in the corresponding forming tool 5 .
  • the blank 1 thus leaves the intermediate cooling 4 at, for example, 600° C. and is introduced into the forming tool within a few seconds, the blank 1 then still having a residual temperature that is somewhat lower, for example 550° C.
  • the invention presents a method which leads to a high-quality formed product, the starting material being able to be procured and made available at low cost and the energy consumption from the beginning of the heating up to the forming being kept relatively low. Further advantages of the invention emerge from the description.
  • the invention is not limited to the exemplary embodiment, but is variable in many ways within the scope of the disclosure.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Heat Treatment Of Articles (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Reinforced Plastic Materials (AREA)
EP21172665.8A 2020-06-18 2021-05-07 Verfahren zum presshärten von warmumformbaren platinen Active EP3925716B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020116126.3A DE102020116126A1 (de) 2020-06-18 2020-06-18 Verfahren zum Presshärten von warmumformbaren Platinen

Publications (2)

Publication Number Publication Date
EP3925716A1 EP3925716A1 (de) 2021-12-22
EP3925716B1 true EP3925716B1 (de) 2023-06-21

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CN115318912A (zh) * 2022-07-28 2022-11-11 苏州普热斯勒先进成型技术有限公司 热冲压成型零件的制备装置及方法

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DE102005003551B4 (de) 2005-01-26 2015-01-22 Volkswagen Ag Verfahren zur Warmumformung und Härtung eines Stahlblechs
DE102008039264A1 (de) 2008-08-22 2010-03-04 Schuler Cartec Gmbh & Co. Kg Verfahren zum Formhärten mit Zwischenkühlung
DE102010048209C5 (de) * 2010-10-15 2016-05-25 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines warmumgeformten pressgehärteten Metallbauteils
DE102012104734A1 (de) * 2012-05-31 2013-12-05 Outokumpu Nirosta Gmbh Verfahren und Vorrichtung zur Herstellung von umgeformten Blechteilen bei Tieftemperatur
DE102012110649C5 (de) 2012-11-07 2018-03-01 Benteler Automobiltechnik Gmbh Warmformlinie sowie Verfahren zur Herstellung eines warmumgeformten und pressgehärteten Kraftfahrzeugbauteils
DE102013100682B3 (de) * 2013-01-23 2014-06-05 Voestalpine Metal Forming Gmbh Verfahren zum Erzeugen gehärteter Bauteile und ein Strukturbauteil, welches nach dem Verfahren hergestellt ist
DE102013107100A1 (de) * 2013-07-05 2015-01-08 Thyssenkrupp Steel Europe Ag Verschleißfestes, zumindest teilweise unbeschichtetes Stahlteil
EP3211103B1 (de) * 2016-02-25 2020-09-30 Benteler Automobiltechnik GmbH Verfahren zur herstellung eines kraftfahrzeugbauteils mit mindestens zwei voneinander verschiedenen festigkeitsbereichen
DE102019201883A1 (de) * 2019-02-13 2020-08-13 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung eines Stahlblechbauteils
DE102021112245A1 (de) * 2020-05-19 2021-11-25 Bilstein Gmbh & Co. Kg Verfahren zum Presshärten von warmumformbaren Stählen

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PL3925716T3 (pl) 2024-01-29
DE102020116126A1 (de) 2021-12-23
PT3925716T (pt) 2023-07-19
ES2951486T3 (es) 2023-10-23
KR20210156763A (ko) 2021-12-27
JP2021195618A (ja) 2021-12-27
EP3925716A1 (de) 2021-12-22
MX2021007277A (es) 2022-07-11
US20210395848A1 (en) 2021-12-23
CN113817907A (zh) 2021-12-21
US11891673B2 (en) 2024-02-06
HUE062532T2 (hu) 2023-11-28

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