WO2011115539A1 - Press hardening plant and a method of press hardening a steel sheet blank - Google Patents

Press hardening plant and a method of press hardening a steel sheet blank Download PDF

Info

Publication number
WO2011115539A1
WO2011115539A1 PCT/SE2011/000027 SE2011000027W WO2011115539A1 WO 2011115539 A1 WO2011115539 A1 WO 2011115539A1 SE 2011000027 W SE2011000027 W SE 2011000027W WO 2011115539 A1 WO2011115539 A1 WO 2011115539A1
Authority
WO
WIPO (PCT)
Prior art keywords
press
hardening
blank
contact
cooled
Prior art date
Application number
PCT/SE2011/000027
Other languages
French (fr)
Inventor
Jan Larsson
Paul ÅKERSTRÖM
Daniel Berglund
Original Assignee
Gestamp Hardtech Ab
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 Gestamp Hardtech Ab filed Critical Gestamp Hardtech Ab
Priority to KR1020127027028A priority Critical patent/KR20130050292A/en
Priority to EP11756614.1A priority patent/EP2547798A4/en
Priority to US13/261,432 priority patent/US8968496B2/en
Priority to JP2013500025A priority patent/JP2013522048A/en
Publication of WO2011115539A1 publication Critical patent/WO2011115539A1/en

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—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
    • 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
    • C21D2221/00—Treating localised areas of an article

Definitions

  • the invention relates to a press-hardening plant and to a method of press hardening a sheet-steel blank such that the finished product is provided with one or more areas having a lower yield point than the rest of the product.
  • the aim of the invention is to provide a simple process with a short cycle time resulting in geometrically well-defined portions having well-defined geometry and a well-defined reduced lower ultimate tensile strength and yield point than the rest of the product.
  • a press-hardening plant includes a press situated between the furnace and the press-hardening press for the contact cooling of predetermined parts of the blank before the blank is formed and hardened in the press-hardening press.
  • a method according to the invention consists in that, after the blank has been heated to the austenitising temperature, selected parts of the blank are contact-cooled to a temperature which promotes ferrite growth during the subsequent transfer to the press-hardening press and during the press-hardening operation.
  • Figure 1 is a diagrammatic representation of a press-hardening plant according to the invention.
  • Figure 2 is an example of a time-temperature diagram for the method according to the invention.
  • Figure 1 is a diagrammatic side view of a heating device in the form of a furnace 11 , a contact-cooling press 12 and a press-hardening press 13. A number of flat sheet-steel blanks 14-18 and a finished product 19 are shown.
  • the blanks pass through the furnace and are heated such that the blank 18 is at the austenitising temperature when it leaves the furnace, i.e. a temperature usually slightly higher than 880 degrees Celsius. Normal austenitising temperature is approximately 900 degrees and up to 930 degrees.
  • the temperature at which a blank emerges from the furnace is designated temperature A, in process step 1.
  • the temperature decreases slightly, indicated by process step 2 in the diagram.
  • the press is activated and the blank is clamped in its tool pair such that a selected part or selected parts of the blank is/are cooled rapidly according to the temperature curve indicated by the solid line to the temperature B, e.g.
  • the blank is then transferred to the press-hardening press 13, i.e. process step 4, and the cooled portion is then at the temperature D, whereas the remaining part of the blank has followed the temperature curve indicated by the dotted line and is at the temperature C, i.e. a normal temperature for press hardening.
  • the press-hardening operation in the cooled tools of the press 13 the blank is formed and hardened into the product 19 in the normal way.
  • the part of the blank pre-cooled in the contact press has formed ferrite during process steps 3 and 4 and a corresponding part of the formed product therefore does not fully harden, but displays reduced hardness and a reduced yield point.
  • Cooling in the contact press 12, i.e. process step 3 normally takes approximately half a second and it can be difficult to achieve reproducibility in such a short time.
  • the contact press can be heated such that the cooling time increases, e.g. to 1.5-2 seconds so that it is easier to control the cooling and the desired ferrite formation before the press-hardening operation.
  • the transfer time between the two presses, i.e. process step 4 is usually 5-10 seconds in practice and should not be less than 15 seconds. The shortest possible transfer time in practice is a few seconds, which can be sufficient.
  • the contact press may consist of several parts having different temperatures or having different contact times so as to result in different ferrite growth and different degrees of hardness in different areas of the finished product. Another alternative is to have contact surfaces of different materials so as to result in different cooling.
  • the contact press has flat surfaces for contact with a flat blank.
  • the contact press may also preform the blank. It is also conceivable for the blank to be preformed before it enters the contact press.

Abstract

In a press-hardening plant, a contact-cooling press (12) is provided between the furnace (11) and the press-hardening press (13). Preselected parts of the blank (18) are contact-cooled such that corresponding parts of the finished product are softer and display a higher yield point.

Description

Press-hardening plant and method of press hardening a sheet-steel blank
Field of the invention
The invention relates to a press-hardening plant and to a method of press hardening a sheet-steel blank such that the finished product is provided with one or more areas having a lower yield point than the rest of the product.
Background of the invention
It is possible to manufacture press-hardened products displaying very high strength. One common field of application is in the vehicle industry and it is possible to control deformation and reduce the risk of crack formation in the event of a collision by providing the product with softer portions having a lower yield point than the rest of the product. WO 2006/038868 describes the use of gaps and EP 1 715 066 A1 and
DE 10 2005 032113 B3 describe the heating of selected portions of the cooled tool pair. In both cases, the cooling rate of the selected portions during the press-hardening operation is reduced, resulting in softer portions. According to EP 1 180 470 B1 , softer portions are obtained by preventing these portions from being heated to the austenitising temperature in the furnace or by cooling them by air blowing before the press-hardening operation.
Aim of the invention
The aim of the invention is to provide a simple process with a short cycle time resulting in geometrically well-defined portions having well-defined geometry and a well-defined reduced lower ultimate tensile strength and yield point than the rest of the product.
Brief description of the invention
A press-hardening plant according to the invention includes a press situated between the furnace and the press-hardening press for the contact cooling of predetermined parts of the blank before the blank is formed and hardened in the press-hardening press.
A method according to the invention consists in that, after the blank has been heated to the austenitising temperature, selected parts of the blank are contact-cooled to a temperature which promotes ferrite growth during the subsequent transfer to the press-hardening press and during the press-hardening operation. The invention is defined by the claims.
Brief description of the drawings
Figure 1 is a diagrammatic representation of a press-hardening plant according to the invention.
Figure 2 is an example of a time-temperature diagram for the method according to the invention.
Description of illustrated embodiment of the invention
Figure 1 is a diagrammatic side view of a heating device in the form of a furnace 11 , a contact-cooling press 12 and a press-hardening press 13. A number of flat sheet-steel blanks 14-18 and a finished product 19 are shown.
The blanks pass through the furnace and are heated such that the blank 18 is at the austenitising temperature when it leaves the furnace, i.e. a temperature usually slightly higher than 880 degrees Celsius. Normal austenitising temperature is approximately 900 degrees and up to 930 degrees. In the temperature diagram in Figure 2, the temperature at which a blank emerges from the furnace is designated temperature A, in process step 1. During the transfer to the contact-cooling press 12, the temperature decreases slightly, indicated by process step 2 in the diagram. With the blank in the press 12, the press is activated and the blank is clamped in its tool pair such that a selected part or selected parts of the blank is/are cooled rapidly according to the temperature curve indicated by the solid line to the temperature B, e.g. which may be approximately or slightly lower than 700 degrees and should not be lower than 580 degrees. This rapid cooling is shown as process step 3 and should reduce the temperature by at least 150 degrees. The blank is then transferred to the press-hardening press 13, i.e. process step 4, and the cooled portion is then at the temperature D, whereas the remaining part of the blank has followed the temperature curve indicated by the dotted line and is at the temperature C, i.e. a normal temperature for press hardening. During the press-hardening operation in the cooled tools of the press 13, the blank is formed and hardened into the product 19 in the normal way. The part of the blank pre-cooled in the contact press has formed ferrite during process steps 3 and 4 and a corresponding part of the formed product therefore does not fully harden, but displays reduced hardness and a reduced yield point. Cooling in the contact press 12, i.e. process step 3, normally takes approximately half a second and it can be difficult to achieve reproducibility in such a short time. The contact press can be heated such that the cooling time increases, e.g. to 1.5-2 seconds so that it is easier to control the cooling and the desired ferrite formation before the press-hardening operation. When the tools are heated in the press-hardening press in the conventional manner, there is increased tool wear. However, the blank is not formed in the contact press 12 and so there is no inconvenient wear. The transfer time between the two presses, i.e. process step 4, is usually 5-10 seconds in practice and should not be less than 15 seconds. The shortest possible transfer time in practice is a few seconds, which can be sufficient.
The contact press may consist of several parts having different temperatures or having different contact times so as to result in different ferrite growth and different degrees of hardness in different areas of the finished product. Another alternative is to have contact surfaces of different materials so as to result in different cooling.
The contact press has flat surfaces for contact with a flat blank. Alternatively, in addition to cooling the blank, the contact press may also preform the blank. It is also conceivable for the blank to be preformed before it enters the contact press.

Claims

Claims
1. Method of press hardening a sheet-steel blank (18) such that the finished product (19) is provided with one or more areas having a lower yield point than the rest of the product, characterised in that, after the blank (18) has been heated to the austenitising temperature, selected parts of the blank are contact-cooled to a temperature which promotes ferrite growth during the subsequent transfer to the press-hardening press (13) and during the press-hardening operation.
2. Method according to claim 1 , characterised in that the said areas are
contact-cooled by more than 150 degrees.
3. Method according to claim 2, characterised in that the said areas are
contact-cooled to a temperature in excess of 580 degrees.
4. Method according to claim 1 or claim 2, characterised in that the said areas are contact-cooled for a period of less than 2 seconds
5. Press-hardening plant including
a device (11) for heating a sheet-steel blank (18) to an austenitic structure and a press-hardening press (13) with cooled tools for forming and hardening the blank into a product (19) in one step,
characterised by
a press (12) situated between the heating device (11) and the press-hardening press (13) for the contact cooling of predetermined parts of the blank (18) before the blank is formed and hardened in the press-hardening press.
PCT/SE2011/000027 2010-03-16 2011-02-17 Press hardening plant and a method of press hardening a steel sheet blank WO2011115539A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020127027028A KR20130050292A (en) 2010-03-16 2011-02-17 Press hardening plant and a method of press hardening a steel sheet blank
EP11756614.1A EP2547798A4 (en) 2010-03-16 2011-02-17 Press hardening plant and a method of press hardening a steel sheet blank
US13/261,432 US8968496B2 (en) 2010-03-16 2011-02-17 Method of press hardening a steel sheet blank
JP2013500025A JP2013522048A (en) 2010-03-16 2011-02-17 Press hardening plant and method of press hardening steel plate blank

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1000236-8 2010-03-16
SE1000236A SE533881C2 (en) 2010-03-16 2010-03-16 Pressure curing plant and means of pressure curing

Publications (1)

Publication Number Publication Date
WO2011115539A1 true WO2011115539A1 (en) 2011-09-22

Family

ID=43535818

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2011/000027 WO2011115539A1 (en) 2010-03-16 2011-02-17 Press hardening plant and a method of press hardening a steel sheet blank

Country Status (6)

Country Link
US (1) US8968496B2 (en)
EP (1) EP2547798A4 (en)
JP (1) JP2013522048A (en)
KR (1) KR20130050292A (en)
SE (1) SE533881C2 (en)
WO (1) WO2011115539A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2446978A1 (en) 2010-03-23 2012-05-02 Benteler Automobiltechnik GmbH Method and device for producing hardened moulded components
WO2013045933A1 (en) * 2011-09-27 2013-04-04 Imperial Innovations Limited A method of forming parts from sheet steel
JP2014513206A (en) * 2011-03-10 2014-05-29 シュヴァルツ，エーファ Furnace system for controlled heat treatment of sheet metal parts
WO2015197469A1 (en) * 2014-06-25 2015-12-30 Thyssenkrupp Steel Europe Ag Method and forming tool for heat-forming, and corresponding work piece
WO2016055230A1 (en) * 2014-10-10 2016-04-14 Voestalpine Metal Forming Gmbh Method for producing hardened steel components
EP3067128A1 (en) * 2015-03-09 2016-09-14 Autotech Engineering, A.I.E. Press system for die quenching and method
EP3067129A1 (en) * 2015-03-09 2016-09-14 Autotech Engineering, A.I.E. Press systems and methods
DE102017213000A1 (en) 2017-07-27 2019-01-31 Bayerische Motoren Werke Aktiengesellschaft Forming process for a sheet metal component
EP3437750A1 (en) * 2017-08-02 2019-02-06 Autotech Engineering A.I.E. Press method for coated steels
EP2993241B1 (en) 2014-08-26 2020-10-07 Benteler Automobiltechnik GmbH Method and press for manufacturing cured sheet metal components, in sections at least

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CN105483531A (en) 2015-12-04 2016-04-13 重庆哈工易成形钢铁科技有限公司 Steel for stamping formation and forming component and heat treatment method thereof
US11283395B2 (en) 2018-03-23 2022-03-22 Nextracker Inc. Multiple actuator system for solar tracker
US11387771B2 (en) 2018-06-07 2022-07-12 Nextracker Llc Helical actuator system for solar tracker
US11050383B2 (en) 2019-05-21 2021-06-29 Nextracker Inc Radial cam helix with 0 degree stow for solar tracker

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WO2006038868A1 (en) * 2004-10-04 2006-04-13 Gestamp Hardtech Ab A method of hot stamping and hardening a metal sheet
DE102005032113B3 (en) * 2005-07-07 2007-02-08 Schwartz, Eva Thermal deformation and partial hardening apparatus, e.g. for automobile components, comprises mold of at least two parts, each formed from segments adjustable to different temperatures
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DE102005032113B3 (en) * 2005-07-07 2007-02-08 Schwartz, Eva Thermal deformation and partial hardening apparatus, e.g. for automobile components, comprises mold of at least two parts, each formed from segments adjustable to different temperatures
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Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2446978A1 (en) 2010-03-23 2012-05-02 Benteler Automobiltechnik GmbH Method and device for producing hardened moulded components
JP2014513206A (en) * 2011-03-10 2014-05-29 シュヴァルツ，エーファ Furnace system for controlled heat treatment of sheet metal parts
WO2013045933A1 (en) * 2011-09-27 2013-04-04 Imperial Innovations Limited A method of forming parts from sheet steel
CN103842528A (en) * 2011-09-27 2014-06-04 英皇创新有限公司 A method of forming parts from sheet steel
WO2015197469A1 (en) * 2014-06-25 2015-12-30 Thyssenkrupp Steel Europe Ag Method and forming tool for heat-forming, and corresponding work piece
EP2993241B1 (en) 2014-08-26 2020-10-07 Benteler Automobiltechnik GmbH Method and press for manufacturing cured sheet metal components, in sections at least
WO2016055230A1 (en) * 2014-10-10 2016-04-14 Voestalpine Metal Forming Gmbh Method for producing hardened steel components
EP3266531A1 (en) * 2015-03-09 2018-01-10 Autotech Engineering, A.I.E. Press systems and methods
EP3266531B1 (en) 2015-03-09 2019-02-27 Autotech Engineering, A.I.E. Press systems and methods
US9492859B2 (en) 2015-03-09 2016-11-15 Autotech Engineering A.I.E. Press systems and methods
EP3067128B1 (en) 2015-03-09 2017-09-13 Autotech Engineering, A.I.E. Press system for die quenching and method
CN107530756A (en) * 2015-03-09 2018-01-02 自动工程公司 Compact system and method
EP3067129A1 (en) * 2015-03-09 2016-09-14 Autotech Engineering, A.I.E. Press systems and methods
EP3067128A1 (en) * 2015-03-09 2016-09-14 Autotech Engineering, A.I.E. Press system for die quenching and method
US10618094B2 (en) 2015-03-09 2020-04-14 Autotech Engineering S.L. Press systems and methods
RU2711705C2 (en) * 2015-03-09 2020-01-21 Аутотек Инжиниринг, С.Л. Systems and methods of pressing
WO2016142367A1 (en) 2015-03-09 2016-09-15 Autotech Engineering A.I.E. Press systems and methods
EP3505265A1 (en) * 2015-03-09 2019-07-03 Autotech Engineering S.L. Press systems and methods
DE102017213000A1 (en) 2017-07-27 2019-01-31 Bayerische Motoren Werke Aktiengesellschaft Forming process for a sheet metal component
WO2019025569A1 (en) * 2017-08-02 2019-02-07 Autotech Engineering A.I.E. Press methods for coated steels and uses of steels
EP3437750A1 (en) * 2017-08-02 2019-02-06 Autotech Engineering A.I.E. Press method for coated steels
EP3661670A1 (en) * 2017-08-02 2020-06-10 Autotech Engineering S.L. Press methods for coated steels and uses of steels
CN111344079A (en) * 2017-08-02 2020-06-26 自动工程有限公司 Pressing method for coated steel and use of steel
RU2742549C1 (en) * 2017-08-02 2021-02-08 Аутотек Инжиниринг С.Л. Methods for pressing coated steel and application of steel
US11633771B2 (en) 2017-08-02 2023-04-25 Autotech Engineering S.L. Press methods for coated steels and uses of steels

Also Published As

Publication number Publication date
KR20130050292A (en) 2013-05-15
SE1000236A1 (en) 2011-02-22
US8968496B2 (en) 2015-03-03
EP2547798A4 (en) 2016-12-28
JP2013522048A (en) 2013-06-13
US20130048160A1 (en) 2013-02-28
SE533881C2 (en) 2011-02-22
EP2547798A1 (en) 2013-01-23

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