EP3467138B1 - Method for forming aluminum alloy blank - Google Patents

Method for forming aluminum alloy blank Download PDF

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Publication number
EP3467138B1
EP3467138B1 EP17194723.7A EP17194723A EP3467138B1 EP 3467138 B1 EP3467138 B1 EP 3467138B1 EP 17194723 A EP17194723 A EP 17194723A EP 3467138 B1 EP3467138 B1 EP 3467138B1
Authority
EP
European Patent Office
Prior art keywords
blank
temperature
forming
ageing
forming tool
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
EP17194723.7A
Other languages
German (de)
English (en)
French (fr)
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EP3467138A1 (en
Inventor
Christian Koroschetz
Gerald Anyasodor
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.)
Automation Press and Tooling AP&T AB
Original Assignee
Automation Press and Tooling AP&T 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
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Application filed by Automation Press and Tooling AP&T AB filed Critical Automation Press and Tooling AP&T AB
Priority to PL17194723T priority Critical patent/PL3467138T3/pl
Priority to EP17194723.7A priority patent/EP3467138B1/en
Priority to PT171947237T priority patent/PT3467138T/pt
Priority to ES17194723T priority patent/ES2906633T3/es
Priority to CN201880061712.0A priority patent/CN111315910A/zh
Priority to MX2020003344A priority patent/MX2020003344A/es
Priority to KR1020207011254A priority patent/KR20200110737A/ko
Priority to CA3084330A priority patent/CA3084330A1/en
Priority to JP2020517798A priority patent/JP2020536166A/ja
Priority to PCT/EP2018/076913 priority patent/WO2019068767A1/en
Priority to US16/652,908 priority patent/US20200299818A1/en
Publication of EP3467138A1 publication Critical patent/EP3467138A1/en
Publication of EP3467138B1 publication Critical patent/EP3467138B1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • 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
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • 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

Definitions

  • the present disclosure relates to a heat treatment method of blank sheets of aluminum alloys, and especially to a method suitable for blank sheets of any aluminum alloy grade, composition or temper.
  • the hot forming of blank sheets is important, in particular hot forming of blank sheets of high strength aluminum alloys.
  • EP2987878 A2 discloses a method of forming an AI alloy blank comprising steps of heating the blank for solution heat treatment, shielding a part of the blank such that a first part of the blank is quenched to a temperature between 150-200°C and a second part of the blank is quenched to below 150°C, forming the blank during or after the quenching, and ageing the formed blank.
  • DE102012007213 A1 discloses a method comprising heating aluminum sheet to solution annealing temperature and molding and simultaneously quenching. Consequently, there is a need for production method for forming aluminum alloy blank sheets which alleviate the mentioned drawbacks of known technology.
  • a method is provided that, with high accuracy of the formed components and low amount of springbacks, is suitable for AA6082 or 7xxx series aluminum alloy grade sheet blank.
  • the time in which the blank is kept at or above the solution heat treatment (SHT) temperature may be chosen to be sufficient to ensure maximum concentration of hardening elements, such as copper, zinc, magnesium, manganese, silicon etc. in the solid solution.
  • the concentration and rate of dissolution of these elements in the solid solution may increase with increasing temperature.
  • the SHT composition of the solid solution may be preserved at the intermediate temperature. If the blank were to be cooled in a too slow rate, the alloying elements may diffuse through the solid solution and concentrate at the grain boundaries, in large voids, undissolved particles or other undesired locations. To achieve improved strength properties of the formed part, it may be desirable to avoid such recrystallization and decrease the diffusion process and maintain the alloying elements in the solid solution by providing a rapid cooling.
  • the cooling rate to achieve this may be selected depending on the aluminum alloy grade and composition of the blank. Further, a quenching rate may be selected depending on the aluminum alloy grade and composition of the blank.
  • the forming tool may be preheated to the intermediate temperature.
  • the blank may thereby be formed at the intermediate temperature.
  • the temperature of the blank may thereby be controlled during the forming, which may improve the accuracy in the properties of the final formed component.
  • the blank may be kept at the intermediate temperature during the forming step in the forming tool.
  • the temperature of the tool may be controlled in order to keep the temperature of both the tool and the blank stable at the intermediate temperature during the forming.
  • the temperature of the forming tool may be controlled in order to quench the formed blank to room temperature.
  • a temperature control function may be provided for the forming tool in order to control the temperature of the forming tool to the intermediate temperature throughout the forming step.
  • the forming and the quenching may be performed in separate forming tools.
  • a first forming tool may form the blank at the intermediate temperature, and a second forming tool may quench the blank to room temperature.
  • the first forming tool may be preheated to the intermediate temperature, thereby keeping the blank at the intermediate temperature during the forming.
  • the blank may then be transferred to the second forming tool, quenching the blank to room temperature.
  • the second forming tool may be a cold forming tool.
  • the first forming tool may not be preheated, thereby cooling the blank during the forming.
  • the blank may then in the second forming tool be quenched in a controlled manner to room temperature in the second forming tool.
  • a method 100 comprises a first step of heating 102 a 6xxx or 7xxx series Al alloy blank 2 to the solutionization (SHT) temperature for the specific alloy of the blank 2.
  • SHT solutionization
  • a blank forming system 1 is provided, wherein the heating 102 is performed in a heating station 10.
  • the temperature of the blank 2 is kept at the SHT temperature or above until the solutionization of the alloy of the blank 2 is complete.
  • the blank 2 is cooled 104 to an intermediate temperature.
  • the cooling 104 is performed at a cooling station 20.
  • the intermediate temperature is selected for the alloy of the blank 2 at which temperature the kinetic movement for the alloy stops.
  • the cooling 104 is performed at a cooling rate high enough such that recrystallization in the alloy of the blank 2 does not occur.
  • the blank 2 is formed 106 in a forming tool 32 at a press station 30 in the blank forming system 1.
  • the press station 30 may be a press suitable for aluminum alloy blank sheet forming, such as a hydraulic press, a servo press (servo hydraulic or servo mechanical).
  • the formed blank 2', or formed component 2' is quenched 108 in the forming tool 32 to room temperature.
  • the formed blank 2' is artificially aged 110 at an ageing station 40.
  • the ageing process is provided to control and limit the recrystallization in the alloy material of the blank 2.
  • Fig. 3 illustrates the blank forming method 100 according to an embodiment of the present invention.
  • the blank 2 is heated from room temperature T E to the SHT temperature T SHT , and kept at the T SHT for a necessary time t 1 -t 2 as discussed above.
  • the blank 2 is rapidly cooled to the intermediate temperature T ITM at the necessary cooling rate as discussed above.
  • the blank 2 is then formed during t 2 -t 3 in the forming tool 32.
  • the formed blank 2' is quenched to room temperature T E .
  • the formed component 2' is processed for artificial ageing by being heated to an ageing temperature T A .
  • the component 2' is kept at the ageing temperature T A during a period t 5 -t 6 until the ageing process is complete.
  • the time t 3 -t 4 provides a transfer of the formed blank to the ageing station 40.
  • the blank 2 is transferred between the different stations 10, 20, 30, 40.
  • the transfer may be performed such that minimal heat loss in the blank 2 is achieved.
  • Figs. 4 and 5 illustrates a method 200 and system 3 according to an embodiment of the invention.
  • the steps of heating 202 and cooling 204 correspond to the steps 102 and 104 as discussed above.
  • the blank 2 is formed 206 in a preheated first forming tool 32a at a press station 30 in the blank forming system 3.
  • the first forming tool 32a is preheated to the intermediate temperature.
  • the blank 2 is thereby not further cooled when arranged in the first forming tool 32a.
  • the intermediate temperature may be kept in the first forming tool 32a and the blank 2 throughout the forming process 106.
  • the formed blank is moved to a separate cold second forming tool 32b.
  • the blank is quenched to room temperature.
  • the cold second forming tool 32b may further form and quench the blank to its final shaped component.
  • Fig. 5 further illustrates an optional arrangement of ageing which can be used for either of the above presented embodiments.
  • a first pre-ageing step is performed at a pre-ageing station 40a, in which the formed component 2' is heated to the ageing temperature T A , kept at T A until the pre-ageing is complete and then cooled to room temperature T E .
  • the component 2' is again heated to T A , kept at T A for a time period and thereafter cooled to room temperature T E , to provide a paint baking of the component 2'.
  • the component can be heated to a different temperature in the paint baking process than the temperature T A in the pre-ageing process.
  • a two-step ageing process is thereby provided comprising pre-ageing and paint baking.
  • the pre-ageing process is integrated in the forming/stamping line, and performed in direct connection to the forming of the component 2'.
  • the paint baking process may be performed at a later stage, whichever may be suitable for the production line.
  • the use of the pre-ageing process prevents natural ageing after stamping in the second forming tool. Otherwise, natural ageing may occur after about 30 minutes for 7xxx series Al alloy materials or about one hour for 6xxx series Al alloy materials.
  • the paint baking process cannot take effect on the formed component to achieve peak hardness.
  • the pre-ageing process further enables post processing activities such as transport to another location, storage for a required period before assembly or joining operations. Then, the paint baking operation may be performed at the most suitable time to provide optimal peak hardness in a short cycle time and at a low cost. This may e.g. be after joining the formed component 2' to a desired assembly.
  • Fig. 6 illustrates the process blank forming method 200 according to an embodiment of the present invention.
  • the blank 2 is heated from room temperature T E to the SHT temperature T SHT , and kept at the T SHT for a necessary time t 1 -t 2 as discussed above. Between t 2 and t 3 , the blank 2 is cooled to the intermediate temperature T ITM at the necessary cooling rate as discussed above. The blank 2 is then formed during t 3 -t 4 in the preheated first forming tool 32a. Between t 4 and t 5 the formed blank 2' is quenched to room temperature T E in the second forming tool 32b.
  • Fig. 6 further illustrate the process of the embodiment comprising a pre-ageing and a paint baking step as discussed above.
  • the formed blank 2' is processed for artificial ageing by being heated to the ageing temperature T A and kept at the ageing temperature T A during a period t 7 -t 8 .
  • the blank 2' is in the second ageing station 40b again heated to the ageing temperature T A and kept at T A between t 11 -t 12 until the ageing process is complete.
  • the blank 2' formed to a final shaped component is then again cooled to room temperature T E .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Heat Treatment Of Articles (AREA)
  • Forging (AREA)
EP17194723.7A 2017-10-04 2017-10-04 Method for forming aluminum alloy blank Active EP3467138B1 (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
PL17194723T PL3467138T3 (pl) 2017-10-04 2017-10-04 Sposób formowania półwyrobu ze stopu aluminium
EP17194723.7A EP3467138B1 (en) 2017-10-04 2017-10-04 Method for forming aluminum alloy blank
PT171947237T PT3467138T (pt) 2017-10-04 2017-10-04 Método para formação de peça em bruto de liga de alumínio
ES17194723T ES2906633T3 (es) 2017-10-04 2017-10-04 Método para conformar preformas de aleación de aluminio
KR1020207011254A KR20200110737A (ko) 2017-10-04 2018-10-03 알루미늄 합금 블랭크를 성형하기 위한 방법 및 시스템
MX2020003344A MX2020003344A (es) 2017-10-04 2018-10-03 Metodo y sistema para formar material en bruto de aleacion de aluminio.
CN201880061712.0A CN111315910A (zh) 2017-10-04 2018-10-03 用于使铝合金坯件成形的方法和系统
CA3084330A CA3084330A1 (en) 2017-10-04 2018-10-03 Method and system for forming aluminum alloy blank
JP2020517798A JP2020536166A (ja) 2017-10-04 2018-10-03 アルミニウム合金ブランクを成形するための方法及びシステム
PCT/EP2018/076913 WO2019068767A1 (en) 2017-10-04 2018-10-03 METHOD AND SYSTEM FOR FORMING ALUMINUM ALLOY DRAFT
US16/652,908 US20200299818A1 (en) 2017-10-04 2018-10-03 Method and system for forming aluminum alloy blank

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17194723.7A EP3467138B1 (en) 2017-10-04 2017-10-04 Method for forming aluminum alloy blank

Publications (2)

Publication Number Publication Date
EP3467138A1 EP3467138A1 (en) 2019-04-10
EP3467138B1 true EP3467138B1 (en) 2021-11-24

Family

ID=60164580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17194723.7A Active EP3467138B1 (en) 2017-10-04 2017-10-04 Method for forming aluminum alloy blank

Country Status (11)

Country Link
US (1) US20200299818A1 (enrdf_load_stackoverflow)
EP (1) EP3467138B1 (enrdf_load_stackoverflow)
JP (1) JP2020536166A (enrdf_load_stackoverflow)
KR (1) KR20200110737A (enrdf_load_stackoverflow)
CN (1) CN111315910A (enrdf_load_stackoverflow)
CA (1) CA3084330A1 (enrdf_load_stackoverflow)
ES (1) ES2906633T3 (enrdf_load_stackoverflow)
MX (1) MX2020003344A (enrdf_load_stackoverflow)
PL (1) PL3467138T3 (enrdf_load_stackoverflow)
PT (1) PT3467138T (enrdf_load_stackoverflow)
WO (1) WO2019068767A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3896188A1 (en) 2020-04-15 2021-10-20 Politechnika Wroclawska A method of manufacturing of energy-absorbing elements made of age-hardenable aluminum alloy sheets that facilitate further joining
CN115318925A (zh) * 2022-08-02 2022-11-11 河南理工大学 一种超硬铝合金7075耐蚀汽车b柱零件冷冲压成形方法
EP4609003A1 (en) * 2022-10-28 2025-09-03 Atieva, Inc. Hot-stamping aluminum formation process
CN116159944B (zh) * 2022-12-28 2025-08-29 大连理工大学 一种航空铝合金薄壁结构件的成形方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5785777A (en) 1996-11-22 1998-07-28 Reynolds Metals Company Method of making an AA7000 series aluminum wrought product having a modified solution heat treating process for improved exfoliation corrosion resistance
US20060070689A1 (en) 2004-10-05 2006-04-06 Corus Aluminium Walzprodukte Gmbh Method of heat treating an aluminium alloy member and apparatus therefor
US7503986B2 (en) 2003-01-21 2009-03-17 Alcoa, Inc. Method for shortening production time of heat treated aluminum alloys
WO2011058332A1 (en) 2009-11-13 2011-05-19 Imperial Innovations Limited Method of forming a component of complex shape from sheet material
WO2015136299A2 (en) 2014-03-14 2015-09-17 Imperial Innovations Limited A method of forming parts from sheet metal alloy
EP2993244A1 (en) 2014-09-05 2016-03-09 Constellium Valais SA (AG, Ltd) High strength products extruded from 6xxx aluminium alloys having excellent crash performance
WO2017062225A1 (en) 2015-10-08 2017-04-13 Novelis Inc. Optimization of aluminum hot working
US20170175239A1 (en) 2015-12-18 2017-06-22 Novelis Inc. High strength 6xxx aluminum alloys and methods of making the same

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US8430978B2 (en) * 2003-08-05 2013-04-30 Jx Nippon Mining & Metals Corporation Sputtering target and method for production thereof
KR100750460B1 (ko) * 2007-06-20 2007-08-22 카야바 고교 가부시기가이샤 알루미늄 합금 파이프
JP2009173973A (ja) * 2008-01-22 2009-08-06 Kobe Steel Ltd 成形時のリジングマーク性に優れたアルミニウム合金板
GB0817169D0 (en) 2008-09-19 2008-10-29 Univ Birmingham Improved process for forming aluminium alloy sheet components
DE102012007213A1 (de) * 2012-04-11 2012-11-29 Daimler Ag Verfahren zur Herstellung eines Aluminiumformteils
EP2581218B2 (en) * 2012-09-12 2018-06-06 Aleris Aluminum Duffel BVBA Production of formed automotive structural parts from AA7xxx-series aluminium alloys
DE102014111920B4 (de) * 2014-08-20 2017-04-13 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Kraftfahrzeugbauteils aus einer härtbaren Aluminiumlegierung
GB201513832D0 (en) * 2015-08-05 2015-09-16 Imp Innovations Ltd A Fast ageing method for heat-treatable aluminium alloys
GB201521443D0 (en) * 2015-12-04 2016-01-20 Impression Technologies Ltd Method for operating a press for metal sheet forming

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5785777A (en) 1996-11-22 1998-07-28 Reynolds Metals Company Method of making an AA7000 series aluminum wrought product having a modified solution heat treating process for improved exfoliation corrosion resistance
US7503986B2 (en) 2003-01-21 2009-03-17 Alcoa, Inc. Method for shortening production time of heat treated aluminum alloys
US20060070689A1 (en) 2004-10-05 2006-04-06 Corus Aluminium Walzprodukte Gmbh Method of heat treating an aluminium alloy member and apparatus therefor
WO2011058332A1 (en) 2009-11-13 2011-05-19 Imperial Innovations Limited Method of forming a component of complex shape from sheet material
WO2015136299A2 (en) 2014-03-14 2015-09-17 Imperial Innovations Limited A method of forming parts from sheet metal alloy
EP2993244A1 (en) 2014-09-05 2016-03-09 Constellium Valais SA (AG, Ltd) High strength products extruded from 6xxx aluminium alloys having excellent crash performance
WO2017062225A1 (en) 2015-10-08 2017-04-13 Novelis Inc. Optimization of aluminum hot working
US20170175239A1 (en) 2015-12-18 2017-06-22 Novelis Inc. High strength 6xxx aluminum alloys and methods of making the same

Also Published As

Publication number Publication date
CN111315910A (zh) 2020-06-19
JP2020536166A (ja) 2020-12-10
US20200299818A1 (en) 2020-09-24
CA3084330A1 (en) 2019-04-11
MX2020003344A (es) 2020-07-28
KR20200110737A (ko) 2020-09-25
PT3467138T (pt) 2022-02-21
ES2906633T3 (es) 2022-04-19
EP3467138A1 (en) 2019-04-10
PL3467138T3 (pl) 2022-04-04
WO2019068767A1 (en) 2019-04-11

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