EP3020491A1 - Procédé de formage des tôles en aluminium - Google Patents

Procédé de formage des tôles en aluminium Download PDF

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Publication number
EP3020491A1
EP3020491A1 EP14003846.4A EP14003846A EP3020491A1 EP 3020491 A1 EP3020491 A1 EP 3020491A1 EP 14003846 A EP14003846 A EP 14003846A EP 3020491 A1 EP3020491 A1 EP 3020491A1
Authority
EP
European Patent Office
Prior art keywords
tool
forming
die
room
punch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP14003846.4A
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German (de)
English (en)
Inventor
Mario Loipetsberger
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.)
Linde GmbH
Original Assignee
Linde GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Priority to EP14003846.4A priority Critical patent/EP3020491A1/fr
Publication of EP3020491A1 publication Critical patent/EP3020491A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the invention relates to a method for forming an aluminum and / or aluminum alloy aluminum sheet, wherein the aluminum sheet is formed by means of a forming tool, wherein the forming tool has a horrmatrize, a tool punch and located between the horrmatrize and the tool die tool space, wherein the horrmatrize and / or the tool die are cooled, wherein the aluminum sheet is introduced into the tool space, wherein the tool die and the die are relatively moved relative to each other for forming the in the tool space aluminum sheet, and wherein the forming tool after the deformation of the aluminum sheet by moving apart of the tool die and the tool punch open and the formed aluminum sheet is removed.
  • Object of the present invention is therefore to improve a method of the type mentioned in that the above-mentioned problems are avoided.
  • a substantially water vapor-free atmosphere is created in the tool room into which the aluminum sheet is introduced and in which it is shaped.
  • substantially free of steam should mean that the dew point of the atmosphere is below -40 ° C. or preferably below -50 ° C.
  • the atmosphere in the tool room is so dry that it does not or only slightly to condensation or ice on the forming tool.
  • a “dry gas” is accordingly understood to mean a gas whose water content is less than 30 vppm.
  • the aluminum sheet to be formed is introduced into the tool space between a tool die and a tool punch. Subsequently, the tool die and the tool punch are moved towards each other, so that the aluminum sheet located between the tool die and the tool punch is shaped into a shaped part according to the shape of the tool die and the tool punch. In practice, this is only one of the two parts of the forming tool, usually the tool punch, moves while the tool die or the other part of the forming tool remains in its position. But it is also possible to move both tool die and tool punches.
  • the forming tool has a tool die, a tool punch and an intermediate sheet holder.
  • the aluminum sheet to be formed is introduced into the tool space between the tool die, the blank holder and the tool punch.
  • the tool die, the sheet holder and the tool punch are moved towards each other, so that the aluminum sheet located between the tool die and the tool punch is reshaped into a shaped part according to the shape of the tool die and the tool punch.
  • only two of the three parts of the forming tool usually the tool die and the blank holder, are moved while the tool punch remains in its position. But it is also possible to move both tool die, blank holder and tool punch.
  • a substantially vapor-free atmosphere is created. This is achieved by introducing a dry gas, preferably an inert gas, into the tool room.
  • a dry gas preferably an inert gas
  • the supply of the dry gas can be carried out by appropriate feeds in the tool space located between the tool die and the tool punch or via suitable gas feeds in the tool punch, in the sheet holder or in the tool die.
  • a higher amount of dry gas introduced into the tool room than when the forming tool is closed preferably before and after the actual forming process, while the forming tool is opened or opened, that is, while the tool punch, the blank holder and the tool die are removed from each other or already from each other are removed and the formed aluminum sheet is released.
  • a smaller amount of dry gas is introduced.
  • dry gas for example inert gas
  • inert gas is supplied only in this phase.
  • the inert gas is thus supplied in the same cycle as the forming tool is opened and closed.
  • the forming tool is located in a press room.
  • the press room forms an enclosure around the forming tool, whereby the forming tool and the tool room are even better protected against the entry of moisture. It is also advantageous to keep the moisture content of the atmosphere in the press room low. It has therefore proven to be advantageous to supply the press room with a dry gas, for example an inert gas.
  • the tool die, the sheet holder and / or the tool punch are cooled with a cryogenic fluid, in particular with liquid nitrogen.
  • a cryogenic fluid in particular with liquid nitrogen.
  • corresponding cooling channels are provided in the tool die, the sheet holder or in the tool punch through which the cryogenic fluid flows.
  • the cryogenic fluid emerging from the tool die or from the tool punch is then preferably conducted in the gaseous state into the tool space and / or the press space.
  • nitrogen or argon are supplied as inert gas to the tool room and / or the press room.
  • Nitrogen has the advantage of being inexpensive.
  • Argon has the advantage that it is heavier than air and thus does not easily escape when opening and closing the forming tool.
  • a press room enclosing the forming tool can be made accessible or non-accessible.
  • a steam-free gas mixture preferably a gas mixture consisting of nitrogen and oxygen, more preferably a gas mixture consisting of 75 to 83% by volume of nitrogen and 17 to 25% by volume of oxygen, more preferably synthetic air of 79% by volume of nitrogen and 21% by volume Supplied oxygen.
  • the pre-cooling can be done for example by immersion in a cryogenic gas, in particular in liquid nitrogen, and / or spraying with a cryogenic gas, in particular with liquid nitrogen.
  • the aluminum sheet may be pre-cooled by contact with at least one cooled plate.
  • the aluminum sheet is pre-cooled by contact cooling with a plate or usually between two plates.
  • This type of pre-cooling has the advantage that the space requirement is relatively low.
  • This contact cooling is particularly advantageous when the plate (s) is / are cooled by a cryogenic fluid flowing through cooling channels in the plate (s). The emerging from the cooling channels fluid can then be supplied to the tool room and / or the press room and thus continue to be used.
  • the described contact cooling between plates is slower compared to direct cooling by immersion or spraying with a cryogenic gas. It is therefore advantageous to provide several such contact cooler in parallel. Further, the heat transfer from the plate or plates to the aluminum sheet can be increased by pressing the plates and the aluminum sheet together.
  • a system for forming aluminum sheets 1 is shown schematically.
  • the aluminum sheets 1 are in this case transported along a transport path 2 through the system or moved by means of a robot.
  • the aluminum sheets 1 are passed through a bath 3 with liquid nitrogen, wherein the aluminum sheets 1 by heat exchange with the liquid nitrogen to a temperature of, for example, -150 ° C, preferably to -196 ° C, are cooled down.
  • the bath 3 can be refilled from a nitrogen tank 4 or another nitrogen tank via line 5.
  • the bath 3 is surrounded by a housing 6, so that evaporating nitrogen is not lost to the environment, but is first collected by the enclosure 6.
  • Gaseous nitrogen can flow out of the housing 6 into the press room 7 via a gas passage opening 8 or through the opening for the conveyor belt 2.
  • the bath 3 with liquid nitrogen can also be used to apply powdery lubricant on the aluminum sheets 1.
  • the powdered lubricants are added to the liquid nitrogen for this purpose.
  • a forming tool 9 with a tool die 10 a blank holder xx and a tool punch 11 is provided. Between the tool die 10, the sheet holder 21 and the tool punch 11 is a tool room 12 for receiving the aluminum sheets 1 to be formed.
  • the transport path 2 for the aluminum sheets 1 passes first through the nitrogen bath 3 and then through the press room 6 and the tool room 12.
  • the forming tool 9 comprises the three parts: tool die 10, sheet holder 21 and tool punch 11.
  • the aluminum sheet 1 is clamped between the tool die 10 and the sheet holder 21 and then pulled by the tool punch 11 into the tool die 10 and thereby pressed into the desired shape.
  • the tool punch 11, the sheet holder 21 and the tool die 10 can be moved relative to each other.
  • Both the tool punch 11, the sheet holder 21 and the tool die 10 are provided with cooling channels 13, 14, 22, is passed through the liquid nitrogen from the nitrogen tank 4.
  • the tool punch 11, the sheet holder 21 and the tool die 10 are thereby likewise cooled down to cryogenic temperatures of, for example, -150 ° C.
  • the deformation of the aluminum sheets 1 in the forming tool 9 is thus carried out in a preferred for the transformation of aluminum temperature range.
  • the forming tool may further be provided with a thermal insulation, not shown in the drawing.
  • the tool room 12 is rendered inert in the cycle of the forming tool 9 with nitrogen gas.
  • the nitrogen emerging from the cooling channels 13, 14, 22 in the tool die 10, the sheet holder 21 and the tool punch 11 is conducted via gas feeds 15, 16 into the tool space 12.
  • the tool space 12 is flushed and rendered inert via the gas feeds 15, 16 with nitrogen gas. Any existing moisture is blown out of the tool room 12 and the entry of moisture into the tool room 12 is prevented.
  • the press room 7 is shielded against the entry of moisture.
  • part of the nitrogen emerging from the cooling channels 13, 14, 22 is conducted into the press room 7.
  • a nitrogen supply 18 for supplying gaseous nitrogen from the nitrogen tank 4 is provided.
  • the press room 7 can also be made walkable depending on the size. For safety reasons, it is favorable to provide a breathable atmosphere in the press room 7. Therefore, a tank or a gas bottle or a cylinder bundle 19 are provided with oxygen, which are connected via an oxygen line 20 to the press room 7. As much oxygen is supplied to the press room 7 via the oxygen line 20 that an atmosphere having an oxygen content of 21% by volume is present in the press room 7. About the various nitrogen supplies 8, 15, 16, 17, 18 and the oxygen supply 20 is the press room 7 so in Result synthetic air supplied with 21% by volume of oxygen and 79% by volume of nitrogen. Entering the press room 7 is thus possible safely. As an additional safety feature, an oxygen sensor is provided, with the aid of which the oxygen content in the press room is monitored.
EP14003846.4A 2014-11-14 2014-11-14 Procédé de formage des tôles en aluminium Withdrawn EP3020491A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14003846.4A EP3020491A1 (fr) 2014-11-14 2014-11-14 Procédé de formage des tôles en aluminium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14003846.4A EP3020491A1 (fr) 2014-11-14 2014-11-14 Procédé de formage des tôles en aluminium

Publications (1)

Publication Number Publication Date
EP3020491A1 true EP3020491A1 (fr) 2016-05-18

Family

ID=51999194

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14003846.4A Withdrawn EP3020491A1 (fr) 2014-11-14 2014-11-14 Procédé de formage des tôles en aluminium

Country Status (1)

Country Link
EP (1) EP3020491A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107866491A (zh) * 2017-12-06 2018-04-03 哈尔滨工业大学 一种铝合金板类构件冷冻成形方法
CN108246895A (zh) * 2018-02-14 2018-07-06 普利仕科技（苏州工业园区）有限公司 一种冲压模具的冷却装置及冲压模具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2688153A1 (fr) * 1992-03-06 1993-09-10 Kobe Steel Ltd Procede d'estampage de feuille en aluminium ou en alliage d'aluminium.
DE102011012240A1 (de) * 2010-03-02 2011-11-03 GM Global Technology Operations LLC Fluid-assisted non-isothermal stamping of a sheet blank
EP2581466A1 (fr) 2011-10-14 2013-04-17 voestalpine Automotive GmbH Procédé de fabrication d'un élément de formage
WO2013178615A1 (fr) * 2012-05-31 2013-12-05 Thyssenkrupp Steel Europe Ag Procédé et dispositif de fabrication de pièces en tôle formées à basse température

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2688153A1 (fr) * 1992-03-06 1993-09-10 Kobe Steel Ltd Procede d'estampage de feuille en aluminium ou en alliage d'aluminium.
DE102011012240A1 (de) * 2010-03-02 2011-11-03 GM Global Technology Operations LLC Fluid-assisted non-isothermal stamping of a sheet blank
EP2581466A1 (fr) 2011-10-14 2013-04-17 voestalpine Automotive GmbH Procédé de fabrication d'un élément de formage
WO2013178615A1 (fr) * 2012-05-31 2013-12-05 Thyssenkrupp Steel Europe Ag Procédé et dispositif de fabrication de pièces en tôle formées à basse température

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107866491A (zh) * 2017-12-06 2018-04-03 哈尔滨工业大学 一种铝合金板类构件冷冻成形方法
CN108246895A (zh) * 2018-02-14 2018-07-06 普利仕科技（苏州工业园区）有限公司 一种冲压模具的冷却装置及冲压模具
CN108246895B (zh) * 2018-02-14 2024-03-29 普利仕科技（苏州工业园区）有限公司 一种冲压模具的冷却装置及冲压模具

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