EP2497840B2 - Ofensystem zum partiellen Erwärmen von Stahlblechteilen - Google Patents

Ofensystem zum partiellen Erwärmen von Stahlblechteilen Download PDF

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Publication number
EP2497840B2
EP2497840B2 EP11157721.9A EP11157721A EP2497840B2 EP 2497840 B2 EP2497840 B2 EP 2497840B2 EP 11157721 A EP11157721 A EP 11157721A EP 2497840 B2 EP2497840 B2 EP 2497840B2
Authority
EP
European Patent Office
Prior art keywords
furnace
temperature
component
heating
areas
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.)
Active
Application number
EP11157721.9A
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German (de)
English (en)
French (fr)
Other versions
EP2497840B1 (de
EP2497840A1 (de
Inventor
Rolf-Josef Schwartz
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.)
Schwartz GmbH
Original Assignee
Schwartz 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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=44357176&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2497840(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Schwartz GmbH filed Critical Schwartz GmbH
Priority to PL11157721T priority Critical patent/PL2497840T5/pl
Priority to ES11157721T priority patent/ES2635765T5/es
Priority to PT111577219T priority patent/PT2497840T/pt
Priority to EP11157721.9A priority patent/EP2497840B2/de
Priority to HUE11157721A priority patent/HUE035766T2/en
Priority to PCT/EP2012/054139 priority patent/WO2012120123A1/de
Priority to US14/003,997 priority patent/US9493856B2/en
Priority to JP2013557116A priority patent/JP2014513206A/ja
Priority to KR1020137026638A priority patent/KR20140044797A/ko
Priority to BR112013023132A priority patent/BR112013023132A2/pt
Priority to CN201280022169.6A priority patent/CN103534364B/zh
Publication of EP2497840A1 publication Critical patent/EP2497840A1/de
Priority to US15/333,352 priority patent/US10287650B2/en
Publication of EP2497840B1 publication Critical patent/EP2497840B1/de
Publication of EP2497840B2 publication Critical patent/EP2497840B2/de
Application granted granted Critical
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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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • 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
    • 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
    • C21D1/62—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
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • 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
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • C—CHEMISTRY; METALLURGY
    • 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
    • C21D2221/00—Treating localised areas of an article

Definitions

  • the invention relates to a furnace system and a method for targeted heat treatment of sheet metal components in individual component zones.
  • press hardening was developed to produce a component from hardened steel sheet.
  • Steel sheets are first heated to an austenite temperature between 850 ° C and 950 ° C, then placed in a press tool, quickly formed and quickly quenched by the water-cooled tool to a martensite temperature of approx. 250 ° C.
  • a steel sheet hardened in this way has only about 6-8% elongation at break, which is disadvantageous in special areas in the event of a collision of two vehicles, particularly in the event of a side impact.
  • the kinetic energy of the penetrating vehicle cannot be converted into heat of deformation. Rather, in this case the component will break brittle and also threaten to injure the occupants.
  • the document WO 2009/113 938 describes a press hardening process with which soft sections in the finished product can be achieved by reducing the cooling rate of these material sections. This reduces the martensite content in these areas and consequently increases the elongation at break of these areas.
  • the European patent application EP 2 143 808 A1 discloses a method for producing a molded component with at least two structural areas of different ductility from a component blank made of hardenable steel, which is heated differently in some areas and then shaped and hardened in areas in a hot-forming and hardening tool, the component blank being heated to a homogeneous temperature of less than AC3 in a heating device is heated and then brought to a temperature above AC3 in the first areas by means of an infrared lamp field, in order to be subsequently hardened in the hot areas and hardness areas in the first areas.
  • bulkheads for separating the temperature fields are proposed.
  • the object of the invention is therefore to provide a furnace system and a method for the targeted heat treatment of sheet metal components, which avoids the disadvantages described above.
  • the furnace system according to the invention is suitable for partially heating sheet steel components to a temperature above the AC3 temperature.
  • the furnace system has a conventional, universal production furnace for heating the sheet steel parts to a temperature close to, but below the AC3 temperature, the furnace system further comprising a profiling furnace with at least one level.
  • the at least one level has an upper and a lower part, as well as a product-specific intermediate flange inserted into a corresponding receptacle, the product-specific intermediate flange being designed to give the component a predetermined temperature profile with temperatures above the AC3 temperature for areas to be hardened and below Apply AC3 temperature for softer areas.
  • the furnace system also has a positioning system on which the component can be placed in a defined position after heating in the production furnace and / or after heating in the profiling furnace. This ensures that the component is in a predefined position after heating in the production furnace or after partial heating in the profiling furnace.
  • the component can then be directed into a pre-defined position in the profiling furnace or a press can be inserted for the subsequent mold hardening process. The more precisely the insertion position of the component can be maintained, the less trimming is required on the finished, hard sheet metal part.
  • the product-specific intermediate flange has means for active cooling of individual areas. In an advantageous embodiment, the cooling is designed as water cooling.
  • the product-specific intermediate flange has means for heating individual areas, which are electrical heaters. This makes it possible to specifically heat and / or cool individual, product-specific areas, so that the temperatures of these areas can be kept within narrow tolerances. If individual areas are heated above the AC3 temperature, these areas will become particularly hard in the subsequent mold hardening process. The other areas, which are not specifically heated to the AC3 temperature, will become less hard in the subsequent mold hardening process and instead have a higher elongation at break. With the electric heaters, a particularly precise temperature control is possible.
  • the furnace system has a production furnace which, as a continuous furnace, has a transport system for passing the components through the production furnace.
  • the cycle time for heating the components can thus be kept at the level of conventional heating ovens for the form hardening process. If the subsequent process step of stamping a temperature profile on the component determines the cycle time, so that the cycle time for the entire process threatens to be extended, a profiling furnace with multiple levels can be used, in which the components are partially or partially heated further in parallel. The parallel use of several profiling furnaces is also conceivable.
  • the profiling furnace has means for temperature control in a closed control loop.
  • more than one control loop can also be provided.
  • the furnace system continues to have a handling system for handling the components.
  • the handling system can quickly and precisely place the components in the positioning system, remove them from the positioning system and insert and remove them in the product-specific intermediate flange in the profiling furnace.
  • the handling system can then insert the components into a press tool for subsequent form hardening.
  • Using a handling system minimizes the risk of injury to operating personnel from the hot components.
  • a handling system executes the movements in defined and reproducible times so that the components can be inserted into the press tool for mold hardening with minimal temperature tolerances, which has proven to be advantageous for the component quality.
  • the component is heated in the production furnace by means of gas burners, natural gas, for example, being used as the energy source.
  • the positioned component is brought into a defined position in the profiling furnace by means of a handling system.
  • the application of a temperature profile to the component in the profiling furnace is advantageously controlled via a closed control loop. This allows the tightest temperature tolerances to be realized on the component, which has a positive effect on the quality of the form-hardened component.
  • areas of the The component is specifically heated to a temperature above the AC3 temperature via a product-specific intermediate flange, while other areas, which are supposed to have a higher elasticity in the finished part, are kept at a temperature below the AC3 temperature.
  • Fig. 1 shows a furnace system according to the invention in a plan view.
  • a first robot 61 positions a component 5 on a roller conveyor that transports the component 5 through the production furnace 10.
  • the production furnace 10 is a conventional universal furnace which is heated with natural gas burners 9 to a temperature below the AC3 temperature of the respective component material.
  • the transport speed of the components 5 through the production furnace 10 is selected such that the components 5 almost assume the temperature prevailing in the production furnace 10.
  • In the transport direction behind the production furnace 10 there is a positioning system 20 that brings each component 5 into a defined lying position.
  • a handling system 22 picks up the component 5 and brings it into a defined position in the profiling furnace 40.
  • the profiling furnace 40 there are an upper part 40 and a lower part 41, as well as a receptacle 44 for a product-specific intermediate flange 45 and the product-specific intermediate flange 45 itself
  • the intermediate flange 45 has on the one hand areas with electrical heaters 46 and on the other hand areas 48 which can be cooled.
  • Such areas 48 can have cooling bores through which a cooling medium, such as water or oil, flows.
  • a cooling medium such as water or oil
  • All known electrical heaters such as, for example, electrical heating cartridges or electrical surface heating systems can be used as electrical heaters 46.
  • Electric heaters have the advantage that they can be regulated very precisely and quickly.
  • the areas 30, which should be particularly hard after a subsequent mold hardening process, are heated to a temperature above the AC3 temperature by the electric heater 46.
  • Other areas 50, which should have a higher elongation at break after the subsequent mold hardening process, are kept at a temperature below the AC3 temperature by the targeted cooling 48 of these areas.
  • the temperature is controlled in at least one closed control loop. After the dwell time required to heat the regions 30 to the desired temperature above the AC3 temperature, the component 5 now provided with a temperature profile is removed from the profiling furnace 40 by means of the handling system 22.
  • the handling system 22 is designed as a rake. However, all other suitable handling systems can also be used.
  • the handling system 22 places the component 5 again on the positioning system 20. However, it is also conceivable to place component 5 on another transfer station after impressing a temperature profile. A second robot 60 then takes over the component 5 in order to insert it into the tool 70 of a press for die hardening. Typically, however, the component 5 can be inserted directly into the press tool 70 without repositioning, since there is no relative movement in the profiling furnace 40 and therefore no more reorientation of the component 5.
  • Fig. 2 shows the profiling furnace 40 in a detailed view as a plan view.
  • a component 5 located in front of the profiling furnace 40 on the positioning system 20 can be seen.
  • Another component 5 is located in the profiling furnace 40.
  • Areas 30 of the component 5 which are supposed to be particularly hard after the shape hardening process are located on regions of the product-specific intermediate flange 45, which can be specifically heated by heaters 46.
  • This is an electrical heating element which is supplied with electrical energy via connections 47, which is made available by a control means (not shown).
  • Another area 50 of the component 5, which should have a greater elongation at break than the hard area 30 after the shape hardening process, is located on an area 48 of the product-specific intermediate flange 45, which can be specifically cooled. For this purpose, cooling medium is passed through the connections 49 into the area 48.
  • Fig. 3 is the section AA Fig. 2 through the profiling furnace 40.
  • the profiling furnace 40 has an upper part 41 and a lower part 42, as well as a receptacle 44 for a product-specific intermediate flange 45 and the product-specific intermediate flange 45 itself.
  • heaters 46 can be seen, which are supplied with energy via connections 47.
  • the component 5 in the region 30 can be specifically heated to a temperature above the AC3 temperature.
  • the handling system 22, which is located in front of the profiling furnace 40 can be seen.
  • the arrows indicate that the handling system 22 can move a component 5 vertically and horizontally, so that a component 5 located on the positioning system 20 (not shown) by means of the handling system 22 can be inserted into the product-specific intermediate flange 45 within the profiling furnace 40.
  • any other suitable handling system can also be used.
  • only one profiling furnace 40 is described with one level.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
EP11157721.9A 2011-03-10 2011-03-10 Ofensystem zum partiellen Erwärmen von Stahlblechteilen Active EP2497840B2 (de)

Priority Applications (12)

Application Number Priority Date Filing Date Title
PL11157721T PL2497840T5 (pl) 2011-03-10 2011-03-10 Układ pieca do częściowego ogrzewania części z blachy stalowej
ES11157721T ES2635765T5 (es) 2011-03-10 2011-03-10 Sistema de horno y procedimiento para el calentamiento parcial de piezas de chapa de acero
PT111577219T PT2497840T (pt) 2011-03-10 2011-03-10 Sistema de forno para o aquecimento parcial de peças de chapa metálica
EP11157721.9A EP2497840B2 (de) 2011-03-10 2011-03-10 Ofensystem zum partiellen Erwärmen von Stahlblechteilen
HUE11157721A HUE035766T2 (en) 2011-03-10 2011-03-10 Furnace system and process for partial heating of sheet metal parts
KR1020137026638A KR20140044797A (ko) 2011-03-10 2012-03-09 판금부 열처리 조절을 위한 가열로 시스템
US14/003,997 US9493856B2 (en) 2011-03-10 2012-03-09 Furnace system for the controlled heat treatment of sheet metal components
JP2013557116A JP2014513206A (ja) 2011-03-10 2012-03-09 板金部品の制御熱処理のための炉システム
PCT/EP2012/054139 WO2012120123A1 (de) 2011-03-10 2012-03-09 Ofensystem zur gezielten wärmebehandlung von blechbauteilen
BR112013023132A BR112013023132A2 (pt) 2011-03-10 2012-03-09 sistema de forno para o tratamento térmico específico de componentes em chapa
CN201280022169.6A CN103534364B (zh) 2011-03-10 2012-03-09 用于金属板部件的控制热处理的炉系统
US15/333,352 US10287650B2 (en) 2011-03-10 2016-10-25 Furnace system for the controlled heat treatment of sheet metal parts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11157721.9A EP2497840B2 (de) 2011-03-10 2011-03-10 Ofensystem zum partiellen Erwärmen von Stahlblechteilen

Publications (3)

Publication Number Publication Date
EP2497840A1 EP2497840A1 (de) 2012-09-12
EP2497840B1 EP2497840B1 (de) 2017-05-03
EP2497840B2 true EP2497840B2 (de) 2020-02-26

Family

ID=44357176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11157721.9A Active EP2497840B2 (de) 2011-03-10 2011-03-10 Ofensystem zum partiellen Erwärmen von Stahlblechteilen

Country Status (11)

Country Link
US (2) US9493856B2 (pl)
EP (1) EP2497840B2 (pl)
JP (1) JP2014513206A (pl)
KR (1) KR20140044797A (pl)
CN (1) CN103534364B (pl)
BR (1) BR112013023132A2 (pl)
ES (1) ES2635765T5 (pl)
HU (1) HUE035766T2 (pl)
PL (1) PL2497840T5 (pl)
PT (1) PT2497840T (pl)
WO (1) WO2012120123A1 (pl)

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JP2022531669A (ja) 2019-05-07 2022-07-08 ユナイテッド ステイツ スチール コーポレイション 連続鋳造された熱間圧延高強度鋼板製品を製造する方法
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BR112013023132A2 (pt) 2016-12-13
PT2497840T (pt) 2017-08-08
EP2497840B1 (de) 2017-05-03
HUE035766T2 (en) 2018-05-28
CN103534364A (zh) 2014-01-22
ES2635765T3 (es) 2017-10-04
KR20140044797A (ko) 2014-04-15
US20140083572A1 (en) 2014-03-27
JP2014513206A (ja) 2014-05-29
CN103534364B (zh) 2016-06-01
US20170037489A1 (en) 2017-02-09
US9493856B2 (en) 2016-11-15
ES2635765T5 (es) 2020-09-28
PL2497840T3 (pl) 2017-10-31
US10287650B2 (en) 2019-05-14
PL2497840T5 (pl) 2020-07-27
EP2497840A1 (de) 2012-09-12

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