EP3212346B1 - Outil de formage servant à produire des pièces formées à chaud - Google Patents

Outil de formage servant à produire des pièces formées à chaud Download PDF

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Publication number
EP3212346B1
EP3212346B1 EP15787146.8A EP15787146A EP3212346B1 EP 3212346 B1 EP3212346 B1 EP 3212346B1 EP 15787146 A EP15787146 A EP 15787146A EP 3212346 B1 EP3212346 B1 EP 3212346B1
Authority
EP
European Patent Office
Prior art keywords
insert
die
recess
component
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
EP15787146.8A
Other languages
German (de)
English (en)
Other versions
EP3212346A1 (fr
Inventor
Jürgen Becker
Bernd Kupetz
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP3212346A1 publication Critical patent/EP3212346A1/fr
Application granted granted Critical
Publication of EP3212346B1 publication Critical patent/EP3212346B1/fr
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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
    • B21D22/022—Stamping using rigid devices or tools by heating the blank or stamping associated with heat treatment
    • 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
    • B21D22/06—Stamping using rigid devices or tools having relatively-movable die parts
    • 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
    • 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 invention relates to a mold for the production of hot-formed components.
  • the structural components of the body are not only significantly involved in the stability of the vehicle, but also play a decisive role in safety in the event of a crash.
  • Hot forming processes are also described in the literature as form hardening or press hardening.
  • a blank is first heated in a furnace to a temperature above the austenitizing temperature of the steel and then simultaneously shaped and cooled, ie hardened, in a tool.
  • a blank is first produced from a blank by cold forming and then a trimmed and trimmed steel component. This is then in one Heating system heated to a temperature above the austenitizing temperature of the steel and then hardened in a mold by rapid cooling.
  • the blank or a component that has already been formed and trimmed from steel is thermomechanically deformed in the tool after heating to the austenitizing temperature, thermomechanical shaping being preferred at a temperature above the final austinization temperature Ac3 (approx. 830 ° C.) between 900 and 1100 ° C.
  • the formed workpieces are cooled by means of cooling, which is located in a closed tool body.
  • the patent DE 19723655 B4 shows a process for the manufacture of steel sheet products by heating a measured steel sheet, thermoforming the steel sheet in a pair of tools, hardening the product formed by rapid cooling from an austenitic temperature while it is still held in the tool pair and then processing the product.
  • a mold for hot press molding a hot, metallic, smooth material is known, the strength of the molded product being controllable by means of a cooling device with a heat insulating device.
  • the heat insulating filing has first recessed portions that are formed on the mold surface of the tool.
  • the invention proposes a molding tool for the production of hot-formed components, in particular sheet metal parts before, with a lower tool part and an upper tool part, which are relatively movable relative to one another and which are designed with corresponding active surfaces for shaping the component, at least the active surface of a tool part being at least partially coolable and cooling lines being provided in the tool part.
  • At least one recess can be provided in at least one of the two tool parts, which, when the tool is closed, forms an air chamber with the component, which acts as a thermal insulator between the component and the tool part.
  • the object of the invention is based on the effect that a workpiece heated in a furnace to a temperature above AC3 is introduced between the tool parts and is hot-formed in the direct method, the workpiece being simultaneously geometrically shaped and thermally cooled.
  • a medium enclosed in the chamber serves as an insulator, so that the workpiece is thereby cooled more slowly in the area of the chamber than in the remaining areas of the component. This results in a structure with lower mechanical strength values in this area of the workpiece than in the rest of the component. Gases, for example inert gases or ambient air, are particularly suitable as the medium.
  • the recess is variable in volume.
  • the amount of air in the chamber can be increased or reduced as required and the degree of insulation with respect to the cooled tool part can be varied.
  • the higher the amount of air in the chamber the higher the insulation.
  • An insert can be arranged in the tool part in which the recess is formed, which forms a tool-side rear wall of the air chamber.
  • the insert has a surface section facing the component, which forms part of the wall of the recess.
  • the insert can be arranged to be movable, in particular linearly displaceable, in the tool part. Depending on the desired degree of insulation, the insert can be transferred to a corresponding position and the volume of the air chamber can be defined.
  • channels can be provided in the insert for temperature control of the insert.
  • a temperature-controlled medium in particular with a gas or with a liquid, for example oil or water, is preferably set to a predetermined temperature.
  • the medium is tempered in a heating and / or cooling device and passed through the channels of the insert. This has the advantage that the insert can be heated or cooled as required.
  • the volume in the chamber can also be tempered, whereby desired mechanical properties can be set in certain areas of the sheet metal part.
  • the insert can be in a retracted position when the tool is closed, in order to produce the recess.
  • a chamber filled with medium / air is then formed in this position.
  • the insert When the tool is open, the insert can be in an advanced position in which the volume of the recess is at least reduced compared to the volume of the recess in the retracted position of the insert.
  • the air is optionally removed from the chamber after each shaping process or after a predetermined number of shaping processes and thereby prevents the air in the chamber from being excessively heated.
  • the recess or the chamber is consequently regularly flushed with the medium / air.
  • the hot forming process - and not least the structure in this area of the workpiece - is not affected.
  • the recess can be actively flushed using a control or regulation.
  • the sheet metal parts can be formed from ferrous metal, in particular from steel and / or from non-ferrous metal, in particular from aluminum and / or magnesium.
  • the cooling lines can conduct a coolant essentially parallel to a surface of the component.
  • the coolant in the cooling lines which can be gaseous or liquid, does not come into direct contact with the component.
  • the thermal energy of the coolant in the cooling lines acts on the component or workpiece through the material of the tool part, which is in contact with the tool part during forming. Individual areas of the component or the workpiece can thus be cooled at different speeds or with different degrees of strength, and various mechanical properties can thereby be realized in the component.
  • cooling lines can be supplied with coolant via a common supply system. This offers the advantage that a uniform temperature control or supply with coolant of the same temperature is ensured in all cooling lines.
  • the active surface of the upper tool part and / or the active surface of the lower tool part can be designed to be coolable, at least in sections. Due to the small thickness of the sheet metal component, which is in the range of 0.5 to 5 mm, one-sided cooling is sufficient. However, in order to achieve particularly rapid and strong cooling, it can be advantageous to implement cooling on both sides.
  • FIG. 1 It shows in a schematic representation Fig. 1 a sectional view through a mold.
  • Fig. 1 shows a molding tool 10, which can be used in presses for the hot forming of tools, in particular sheet metal blanks to sheet metal components 17.
  • the molding tool 10 has a lower tool half 12u, which is seated on a base plate 11.
  • the lower mold half 12u interacts with an upper mold half 12o.
  • the mutually facing active surfaces of the upper mold half 12o and the lower mold half 12u are designed correspondingly, so that they function like the die and punch of a press tool.
  • the tool half 12o is designed as a stamp and the tool half 12u as a die.
  • the upper and lower mold halves can be interchanged with respect to their arrangement, so that the upper tool acts as a die and the lower tool acts as a punch.
  • the upper tool half 12o and the lower tool half 12u are relatively movable with respect to one another.
  • mold halves 12o, 12u can be moved apart and moved together again. When the mold halves move together, a piece of sheet metal or a sheet metal plate gets between the mold halves and is encompassed and shaped by the active surfaces.
  • the in Fig. 1 The state shown corresponds to an end position of the tool halves 12u, 12o during a forming process in which the component 17 is completely formed.
  • An insert 16 is shown in the upper tool half 12o and is movable along the double arrow B relative to the tool half 12o.
  • the insert 16 is thus linearly displaceable in the direction of the component 17 and away from the component 17.
  • the insert 16 performs a linear movement essentially perpendicular to the component surface. Alternatively, however, a movement at an angle to the Component surface are carried out.
  • the insert 16 forms a recess 15.
  • the recess 15 acts as a chamber which is filled with air. This chamber 15 is bordered by a surface of the insert 16 which faces the component 17, an inner surface of the opening through the upper tool half 12o in which the insert 16 is inserted and a section of the surface of the component 17.
  • the air in this chamber 16 isolates the warm sheet metal part 17 coming from the furnace from the upper tool half 12o and the insert 16 located therein.
  • the component 17 cools more slowly in the area of the air chamber 15, so that a structure with low mechanical characteristics, in particular with low strength values, is established in this area.
  • the air gap 15 thus covers exactly the area that is characterized in the later component or vehicle by low strength and thus high ductility. The properties of the component can thus be set in such a way that a targeted deformation of the ductile area results in the event of a vehicle crash.
  • the size of the air chamber 15 can be changed by moving the insert 16. Depending on the selected position of the insert 16 i.e. depending on the size of the air chamber 16, other desired strength values can be set accordingly in the area of the component.
  • the air chamber 16 can also be designed as a gap, in particular with a small volume.
  • 16 channels 18 can optionally be arranged in the insert, which are used for temperature control of the insert.
  • the insert 16 is flushed with a temperature-controlled medium and set to a predetermined temperature.
  • the medium is preheated in a heating and / or cooling device and passed through the channels 16 of the insert 18.
  • the temperature of the insert 16 and thus the air in the chamber 15 can thus be controlled or regulated via the temperature of the medium.
  • Gases, for example inert gases or liquids, for example oil or water, are particularly suitable as the medium.
  • the provision of channels 18 is only optional. In other embodiments of the invention, the insert 16 can also be designed without the medium-carrying channels 18.
  • a mold insert 13 is provided in the lower mold half 12u, in which a cooling system which has a plurality of cooling lines 14 is integrated.
  • the use of such cooling inserts 13 offers the advantage, on the one hand, that different component contours can be embossed with a lower molding tool 12u, in that the molding insert 13 can be exchanged in accordance with the desired component shape.
  • the cooling lines 14 are fluidly connected to a distributor or connection system. The coolant is thus introduced via the connection system and distributed to the cooling lines 14.
  • the cooling lines 14 shown run essentially parallel to the surface of the component 17 and thus also essentially parallel to the active surface of the mold halves 12u, 12o.
  • the cooling lines 14 thus follow the component contour at a certain distance into the mold insert 13 of the lower mold half 12u.
  • Gaseous cooling media, liquid cooling media or a combination thereof are suitable as coolants for the cooling lines 14.
  • a single insert 16 is shown, which is arranged in the upper tool part 12o. In a further embodiment of the invention, not shown, it can be used in the lower tool part 12u may be arranged. Alternatively, one or more inserts 13 can be positioned both in the upper and in the lower tool half 12o, 12u. In addition, only the lower tool half 12u is provided with cooling lines 14. In further embodiments of the invention, the arrangement of the cooling system, ie the connection system and the cooling lines 14, can alternatively also be arranged in the upper tool half 12o. In a further alternative embodiment, cooling lines 14 can be provided both in the upper tool half 12o and in the lower tool half 12u. In addition, a mold insert 13 can alternatively be arranged in the upper tool half 12o or in both tool halves.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Claims (8)

  1. Outil de formage (10) pour fabriquer des pièces (17) formées à chaud, notamment des pièces en tôle formée, comportant une partie inférieure d'outil (12u) et une partie supérieure d'outil (12o) qui sont mobiles l'une par rapport à l'autre et ont des surfaces actives correspondantes pour former la pièce (17),
    au moins la surface active d'une des parties d'outil (12u, 12o) est réalisée de façon à pouvoir être refroidie au moins par segments, cette partie (12u, 12o) ayant des conduites de refroidissement (14),
    au moins l'une des deux parties d'outil (12u, 12o) a au moins un évidement (15) qui, lorsque l'outil (10) est en position fermée, constitue une chambre à air avec la pièce (17), fonctionnant comme isolant thermique entre la pièce (17) et la partie d'outil (12o),
    outil caractérisé en ce que
    l'évidement (15) est de volume variable.
  2. Outil de formage selon la revendication 1,
    caractérisé en ce que
    la partie d'outil (12u, 12o) munie de l'évidement (15) a un insert (16) qui constitue la paroi arrière, côté outil, de la chambre à air.
  3. Outil de formage selon la revendication 2,
    caractérisé en ce que
    l'insert (16) est mobile, notamment coulissant linéairement, dans la partie d'outil.
  4. Outil de formage selon la revendication 3,
    caractérisé en ce qu'
    à l'état fermé de l'outil (10) l'insert (16) est en position rétractée pour former l'évidement (15).
  5. Outil de formage selon la revendication 3 ou 4,
    caractérisé en ce qu'
    à l'état ouvert de l'outil (10), l'insert est dans une position décalée dans laquelle le volume de l'évidement (15) est réduit par rapport au volume de l'évidement (15) en position rétractée de l'insert (16).
  6. Outil de formage selon l'une des revendications 2 à 5,
    caractérisé en ce que
    l'insert (16) comporte les canaux (18).
  7. Outil de formage selon l'une des revendications précédentes,
    caractérisé en ce que
    les pièces de tôle formées sont en fer, notamment en acier et/ou en un métal non ferreux, en particulier en aluminium et/ou en magnésium.
  8. Outil de formage selon l'une des revendications 2 à 7,
    caractérisé en ce que
    l'insert (16) est en un métal, en non-métal, notamment en béton, en bois ou en une combinaison de ces matériaux.
EP15787146.8A 2014-10-29 2015-10-08 Outil de formage servant à produire des pièces formées à chaud Active EP3212346B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014221997.3A DE102014221997A1 (de) 2014-10-29 2014-10-29 Formwerkzeug zur Herstellung von warmumgeformten Bauteilen
PCT/EP2015/073207 WO2016066391A1 (fr) 2014-10-29 2015-10-08 Outil de formage servant à produire des pièces formées à chaud

Publications (2)

Publication Number Publication Date
EP3212346A1 EP3212346A1 (fr) 2017-09-06
EP3212346B1 true EP3212346B1 (fr) 2020-05-13

Family

ID=54361051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15787146.8A Active EP3212346B1 (fr) 2014-10-29 2015-10-08 Outil de formage servant à produire des pièces formées à chaud

Country Status (4)

Country Link
US (1) US10537928B2 (fr)
EP (1) EP3212346B1 (fr)
DE (1) DE102014221997A1 (fr)
WO (1) WO2016066391A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014118416B4 (de) * 2014-12-11 2017-02-23 Thyssenkrupp Ag Werkzeug zum Umformen und/oder partiellen Presshärten eines Werkstücks
EP4032631A1 (fr) * 2021-01-26 2022-07-27 C.R.F. Società Consortile per Azioni Appareil et procédé d'estampage à chaud de feuilles métalliques avec modulation de la vitesse de trempe

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Publication number Priority date Publication date Assignee Title
SE9602257L (sv) 1996-06-07 1997-12-08 Plannja Hardtech Ab Sätt att framställa ståldetalj
DE102005025026B3 (de) 2005-05-30 2006-10-19 Thyssenkrupp Steel Ag Verfahren zum Herstellen eines Metallbauteils mit aneinander angrenzenden Abschnitten unterschiedlicher Materialeigenschaften
JP4664781B2 (ja) * 2005-09-12 2011-04-06 新日本製鐵株式会社 熱間プレス成形用金型および熱間プレス成形装置並びに熱間プレス成形方法
CN100464890C (zh) 2005-12-19 2009-03-04 河南科技大学 一种镁合金管件的成形方法及装置
CN101288889B (zh) 2007-04-18 2012-07-11 上海大众汽车有限公司 超高强度钢板热冲压成型模具
WO2009123538A1 (fr) * 2008-04-03 2009-10-08 Gestam Hardtech Ab Procédé de fabrication d'un produit métallique en feuillets formé sous presse
CN201231286Y (zh) 2008-07-31 2009-05-06 钢铁研究总院 汽车车身零件用热冲压成型模具
DE102009020423A1 (de) * 2009-05-08 2010-11-11 Bayerische Motoren Werke Aktiengesellschaft Teileverbund mit einem pressgehärteten Blechbauteil
JP5740099B2 (ja) * 2010-04-23 2015-06-24 東プレ株式会社 熱間プレス製品の製造方法
US8194036B1 (en) * 2011-06-29 2012-06-05 Google Inc. Systems and methods for controlling a cursor on a display using a trackpad input device
JP5611257B2 (ja) * 2012-03-13 2014-10-22 パナソニック株式会社 金属ラミネートフィルム成形方法およびその成形装置
KR20130108899A (ko) 2012-03-26 2013-10-07 현대자동차주식회사 핫 스탬핑 장치
DE102012106405B4 (de) * 2012-07-17 2016-06-16 Kirchhoff Automotive Deutschland Gmbh Verfahren zum Herstellen eines umgeformten und zumindest bereichsweise gehärteten Metallblechbauteils sowie Verwendung eines Presshärtwerkzeuges zum Herstellen eines solchen Bauteiles
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DE102014108901B3 (de) * 2014-06-25 2015-10-01 Thyssenkrupp Ag Verfahren und Umformwerkzeug zum Warmumformen sowie entsprechendes Werkstück

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Also Published As

Publication number Publication date
US10537928B2 (en) 2020-01-21
DE102014221997A1 (de) 2016-05-04
US20170225214A1 (en) 2017-08-10
WO2016066391A1 (fr) 2016-05-06
CN106660097A (zh) 2017-05-10
EP3212346A1 (fr) 2017-09-06

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