EP2107952B1 - Dispositif de formage des pieces par etirage plan - Google Patents

Dispositif de formage des pieces par etirage plan Download PDF

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Publication number
EP2107952B1
EP2107952B1 EP07818526.1A EP07818526A EP2107952B1 EP 2107952 B1 EP2107952 B1 EP 2107952B1 EP 07818526 A EP07818526 A EP 07818526A EP 2107952 B1 EP2107952 B1 EP 2107952B1
Authority
EP
European Patent Office
Prior art keywords
tool
umformsicken
forming
forming beads
beads
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.)
Not-in-force
Application number
EP07818526.1A
Other languages
German (de)
English (en)
Other versions
EP2107952A1 (fr
Inventor
Dejan Vlahovic
Mathias Liewald
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.)
Universitaet Stuttgart
Original Assignee
Universitaet Stuttgart
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 Universitaet Stuttgart filed Critical Universitaet Stuttgart
Publication of EP2107952A1 publication Critical patent/EP2107952A1/fr
Application granted granted Critical
Publication of EP2107952B1 publication Critical patent/EP2107952B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/04—Clamping arrangements
    • 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
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks

Definitions

  • the invention relates to a device for the flat ironing of workpieces, with a tool upper part and a tool upper part engaging with the tool lower part.
  • Cyril-Bath method in which a workpiece is clamped in a clamping device having at least two clamping elements and, if appropriate, formed with a forming tool, for example a deep-drawing tool.
  • this method can also be used exclusively for the flat stretch drawing of sheets.
  • the method of flat stretch drawing is used in particular for relatively flat workpieces in order to achieve sufficient solidification thereof.
  • the DE 195 04 649 C1 describes a method and a drawing tool for ironing sheet metal.
  • the drawing tool in the region of its outer periphery on a dipping into a trench of the counter tool web.
  • the DE 24 50 624 A1 describes a device for pressing deep, thin-walled container bottoms with large diameters, which has a tool insert and a counter-holder.
  • the tool insert and the counterholder in turn have a multiple draw bead, which, similar to the DE 195 04 264 A1 , When deep drawing of the workpiece acts as a hold-down and it must muster very high hold-down forces.
  • Another device is from the DE 723 220 C known.
  • the forming beads of the upper tool part and the lower tool part ensure a simultaneous holding and pulling of the workpiece, so that even with a single-acting press in a train a flat ironing and optionally subsequently a forming of the workpiece can be performed without the need for additional tools are required.
  • the Umformsicken so serve not only for holding, but for the simultaneous induction of a tensile force in the workpiece, which is responsible for the flat ironing. During the penetration of the Umformsicken into the corresponding recesses, the workpiece moves within a closed geometry of the Umformsicken.
  • the workpiece is thus inventively drawn into this Umformsickengeometrie, wherein the tensile force is influenced by the geometry of the tool formed by the upper part of the tool and the lower tool part. Clamping of the workpiece, as is the case with devices known from the prior art, does not take place with the device according to the invention.
  • the tool movement is induced by the movement of the press or of the press ram, advantageously no additional drive and only one tool are required for performing the flat stretch drawing, which leads to an extremely low control effort. Furthermore, the tool can be made very simple and compact and is thus produced in a cost effective manner.
  • the stretching operation thus takes place in one stroke and, if further forming is necessary or desired, can be preceded by the deep-drawing stroke or combined with a deep-drawing stroke, so that the high process times present in the previous methods can be considerably reduced.
  • the material can slide back into the tool during a subsequent drawing operation, so that tears in the workpiece can be avoided and a high quality is ensured.
  • the investment costs are essentially limited to material and manufacturing costs, so that the device according to the invention can be realized considerably cheaper than known devices. In fact, savings of up to 90% can be achieved in terms of investment in tooling costs.
  • a variation of the tensile force induced in the workpiece can be achieved according to the invention in that the forming beads of the upper tool part and / or the lower tool part are designed so that they engage with the recesses of the lower tool part and / or the upper part of the tool at different times.
  • the Umformsicken and located between the Umformsicken recesses are arranged on two opposite sides of the upper tool part and the lower tool part.
  • a device designed in this way has a very simple construction and can be used for the flat stretch drawing of workpieces in one direction.
  • the Umformsicken are arranged on a total of four sides of the upper tool part and the lower tool part, wherein in each case two of the four sides facing each other.
  • the Umformsicken are arranged on three sides of the upper tool part and the lower tool part in triangular shape.
  • Such an embodiment of the device can be used in triangular tools.
  • Umformsicken and located between the Umformsicken recesses are arranged in a circle on the upper tool part and the lower tool part.
  • the height of the Umformsicken varies over the length thereof.
  • One possibility for realizing the penetration of the Umformsicken at different times may consist in that the height of the Umformsicken on each side of the upper die and / or the lower die part is different, the height difference between adjacent Umformsicken is 5 - 30 mm.
  • the Umformsicken can be higher on the outside of the upper tool part and / or the lower tool part as on the inside, so that first the outer portion of the tool comes into contact with the workpiece.
  • the Umformsicken on the inside of the upper tool part and / or the lower tool part may be higher than on the outside.
  • the edges of the Umformsicken facing the workpiece are provided with radii having a size of 1 - 20 mm, in particular from 2 - 10mm.
  • the design of the radii of the workpiece facing edges of the Umformsicken has proved to be crucial in terms of Training of the tensile force induced in the workpiece exposed because smaller radii induce a higher forming force in the workpiece.
  • the invention provides that the forming bead, which first engages with the corresponding recess, has a smaller radius than the last forming bead engaging with the corresponding recess. As a result, a very high stress is induced in the workpiece as soon as the first forming bead penetrates.
  • a deep-drawing tool can be arranged in a gap between the forming beads.
  • a spring-loaded hold-down element is arranged in at least one of the recesses.
  • Such spring-loaded hold-down elements improve the wrapping of the workpiece and thus ensure an improved forming process.
  • Fig. 1 shows a device 1 for the flat drawstretching of a workpiece 2 shown by a dashed line, for example a steel, aluminum or titanium sheet.
  • the device 1 has a tool upper part 3 and a tool lower part 4 engaging with the tool upper part 3.
  • the upper tool part 3 and the lower tool part 4 are movable relative to each other, wherein in the present case, the lower tool part 4 is rigid and the upper tool part 3 can be moved by means of a drive device, not shown, but known per se.
  • the tool lower part 4 could be movable and the upper tool part 3 could be rigid or both tool parts 3 and 4 could be movable relative to one another.
  • the upper tool part 3 and the lower tool part 4 are preferably made of a suitable tool steel, but for small series can also be used plastic materials. Ceramics or suitable composite materials can also be used for the upper tool part 3 and the lower tool part 4. For a hot forming can be provided to heat the upper tool part 3 and / or the lower tool part 4.
  • the upper tool part 3 has in each case on at least two sides thereof a plurality of Umformsicken 5, which in the relative movement between the upper tool part 3 and the lower tool part. 4 engage in corresponding recesses 6 of the lower tool part 4.
  • the lower tool part 4 has a plurality of Umformsicken 7, which engage in respective recesses 8 of the upper tool part 3.
  • the Umformsicken 5 and 7 may be provided with a coating, for example, to influence the required forming forces.
  • a deep-drawing tool 10 is arranged, which also consists of a tool upper part 11 and a lower tool part 12.
  • the deep-drawing tool 10 may be formed in a manner known per se and, in particular, the deep-drawing tool 10 may also be dispensed with if the device 1 is used only for flat ironing of the workpiece 2 and no deep-drawing machining thereof is required.
  • gas springs of the upper tool 11 can of course be omitted.
  • FIGS. 2, 3 and 4 is a first embodiment of the upper tool part 3 and the lower die part 4 and in particular of the Umformsicken 5 and 7 thereof shown.
  • the upper tool part 3 has a total of four Umformsicken 5a, 5b, 5c and 5d and located therebetween recesses 8a, 8b and 8c.
  • the lower tool part 4 has three Umformsicken 7a, 7b and 7c and located therebetween recesses 6a, 6b and 6c.
  • between the innermost Umsummsicke 7c and one for placing the workpiece 2 serving Workpiece support 2a also has a recess, namely the recess 6c, provided, in which engages the innermost Umformsicke 5d.
  • the Umformsicken 7 of the lower tool part 4 should be at least as high as the workpiece support 2a. In the case where the deep-drawing tool 10 is present, the workpiece support 2a serves as a forming die or forms the same.
  • the forming beads 5a, 5b, 5c and 5d of the upper tool part 3 are interpreted in the illustrated embodiment so that they go at different times with the recesses 6a, 6b and 6c of the lower tool part 4 in engagement.
  • the Umformsicken 7 of the lower tool part 4 could be designed accordingly. This applies in principle for all embodiments of the device 1 described below, in which reference is made to a particular embodiment of the Umformsicken 5 of the upper tool part 3.
  • the Umformsicken 5a and 5b of the upper tool part 3 on the outside thereof are higher than the Umformsicken 5c and 5d on the inside.
  • the two outer Umformsicken 5a and 5b in front of the two inner Umformsicken 5c and 5d engage the workpiece. 2
  • the workpiece 2 facing edges of the Umformsicken 5 and 7 are provided with radii whose size is in particular in a range of 1 - 20 mm, in particular 2-10mm.
  • the forming bead 5a engaging first with the corresponding recess 6a has a smaller radius than the last with the corresponding recess 6c engaged forming bead 5d.
  • the order of the different dimensioned radii of the Umformsicken 5 and 7 has a significant impact on the induced stress in the workpiece 2 and thus on the transformation of the same.
  • the geometry of the Umformsicken 5 and 7 can be further adapted to the geometry and / or the material of the workpiece 2 to edit each workpiece 2 according to its requirements.
  • the two outer Umformsicken 5a and 5b together with the workpiece 2 engage.
  • the outermost forming bead 5a penetrates into the workpiece 2 as the first and in particular in front of the adjacent forming bead 5b.
  • the height of the Umformsicken 5 and 7 is in particular 20 - 120 mm and may be different on each side of the upper tool part 3 and / or the lower tool part 4.
  • the height differences between adjacent Umformsicken 5a - 5d or 7a - 7c can be between 5 and 30 mm.
  • the tool upper part 3 has four forming beads 5 and the tool lower piece 4 has three forming beads 7.
  • the minimum number of Umformsicken 5 or 7 is two, more than eight Umformsicken 5 and 7 are not required, each between two Umformsicken 5 a recess 8 and between two Umformsicken 7 is a recess 6.
  • FIGS. 5, 6 and 7 an embodiment of the device 1 is shown, in which the Umformsicken 5d and 5c on the inside of the upper tool part 3 are higher than on the outside thereof.
  • the inner Umformsicken 5d and 5c come before the outer Umformsicken 5b and 5a with the corresponding recesses 6 of the lower tool part 4 into engagement.
  • the information regarding the height of the Umformsicken 5 and 7 and attached to the same radii can essentially the information on the embodiment of the FIGS. 2, 3 and 4 correspond, wherein the Umformsicken 5a - 5d of the upper tool part 3 have smaller radii than in the previous embodiment.
  • Fig. 8 shows a cross section through any of the Umformsicken 5 or 7. It can be seen that the Umformsicken 5 and 7 in the height direction have a substantially rectangular cross-section, which may be located on the workpiece 2 side facing the above-mentioned different radii. It has been found to be particularly suitable when the width of the Umformsicken is 10 - 40 mm.
  • Fig. 9 an embodiment of one of the Umformsicken 5 or 7 is shown, in which the height varies over the length thereof.
  • a different degree of deformation can be achieved over the surface of the workpiece 2, or certain areas can be shaped differently than other areas of the workpiece 2, as a result of which forming errors can optionally be avoided.
  • FIGS. 10-21 show different embodiments of the arrangement of the Umformsicken 5 and / or 7 on the upper tool part 3 and / or the lower tool part 4.
  • each of the upper tool part 3 is shown with the Umformsicken 5, the arrangement is, of course, also for the Umformsicken 7 of the lower tool part. 4 ,
  • the Umformsicken 5 and 7 and located between the Umformsicken 5 and 7 recesses 6 and 8 are arranged on two opposite sides of the upper tool part 3 and the lower tool part 4.
  • the embodiment of Fig. 11 in which the Umformsicken 5 and 7 and the recesses 6 and 8 on the longitudinal side instead, as in Fig. 10 , are arranged on the broad side of the upper tool part 3 and the lower tool part 4.
  • the embodiments of Figures 12 - 15 are formed, in which case the Umformsicken 5 and 7 and the recesses 6 and 8 are bent in the longitudinal direction thereof.
  • the Umformsicken 5 and 7 are the Umformsicken 5 and 7 and located between the Umformsicken 5 and 7 recesses 6 and 8 arranged on a total of four sides of the upper tool part 3 and the lower tool part 4. In each case two of the four sides are opposite each other. Similar to the embodiments of the FIGS. 10-15 can here as well as straight over their length bent Umformsicken 5 and 7 and recesses 6 and 8 are used.
  • the Umformsicken 5 and 7 and the recesses 6 and 8 are the Umformsicken 5 and 7 and the recesses 6 and 8 to three Pages of the tool shell 3 and the lower tool part 4 arranged so that they form a triangular shape.
  • a similar closed shape of the Umformsicken 5 and 7 is also in the embodiment of Fig. 21 recognizable, in which the Umformsicken 5 and 7 and the recesses 6 and 8 located between the same are arranged in a circle on the upper tool part 3 and the lower tool part 4.
  • the Umformsicken 5 and 7 and the recesses 6 and 8 located between the same are arranged in a circle on the upper tool part 3 and the lower tool part 4.
  • FIGS. 22, 23 and 24 an embodiment of the device 1 is shown, in which between the Umformsicken 5 and the upper die 3 respective Unterlegplatten 13 are arranged, through which the penetration depth of the Umformsicken 5 can be influenced in the workpiece 2, if different levels Unterlegplatten 13 are used.
  • the shims 13 could also be provided on the lower tool part 4. Even without the shims 13, the Umformsicken 5 and 7 can be removably attached to the upper tool part 3 and the lower tool part 4.
  • at least one gas spring sprung holding-down element 14 which is able to improve the looping of the workpiece 2.
  • the recesses 6 and / or 8 may be provided in one or more of the recesses 6 and / or 8 such hold-down elements.
  • thermoforming tool 10 is provided, by means of which the workpiece 2 during its processing not only just stretched, but after the flat stretch-drawing additionally deep-drawn.
  • the forming die 5 closest to the deep-drawing tool 10 may be formed as a draw ring.
  • FIGS. 17 and 18 is particularly advantageous that is prevented by the cut corners between the individual Umformsicken 5 and 7, that the workpiece 2 between the upper die 3 and the lower tool part 4 tilt and thus can pinch the device 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Claims (13)

  1. Dispositif (1) d'emboutissage de pièces à usiner (2), par étirage plan comportant une pièce d'outillage supérieure (3) agencée pour s'engager dans une pièce d'outillage inférieure (4), ces pièces étant mobiles l'une par apport à l'autre, dans lequel, à la fois la pièce d'outillage supérieure (3) et la pièce d'outillage inférieure (4) comportant respectivement sur deux cotés, au moins deux moulures de formage (5, 7) éloignées l'une de l'autre, qui s'engagent respectivement dans des évidements correspondants (6, 8) de la pièce d'outillage inférieure (4) ou de la pièce d'outillage supérieure (3),
    dans lequel les moulures de formage (5, 7) de la pièce d'outillage supérieure (3) et/ou de la pièce d'outillage inférieure (4) sont réalisées de telle manière qu'elles entrent en contact à des moments différents avec les évidements (6, 8) de la pièce d'outillage inférieure (4) et/ou de la pièce d'outillage supérieure (3),
    caractérisé en ce que,
    les arêtes des moulures de formage (5, 7) orientées en regard de la pièce à usiner (2) comportent des arrondis dont les rayons de courbure sont compris entre 1 et 20 mm, en particulier entre 2 et 10 mm et en ce que l'évidement (6, 8) qui entre en premier en prise avec la moulure de formage (5, 7) a un rayon de courbure inférieur à celui de la moulure de formage (5, 7) qui entre en dernier en prise avec l'évidement correspondant (6, 8).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que,
    les moulures de formage (5, 7) et les évidements (6, 8) disposés entre les moulures de formage (5, 7) sont disposés sur deux côtés en regard de la pièce d'outillage supérieure (3) et de la pièce d'outillage inférieure (4).
  3. Dispositif selon la revendication 1,
    caractérisé en ce que,
    les moulures de formage (5, 7) et les évidements (6, 8) disposés entre les moulures de formage (5, 7) sont ménagés sur quatre côtés de la pièce d'outillage supérieure (3) et de la pièce d'outillage inférieure (4), dans lequel respectivement deux des quatre côtés sont disposés en regard.
  4. Dispositif selon la revendication 1,
    caractérisé en ce que,
    les moulures de formage (5, 7) et lesdits évidements (6, 8) disposés entre les moulures de formage (5, 7) sont ménagés sur trois côtés de la pièce d'outillage supérieure (3) et de la pièce d'outillage inférieure (4), disposés en triangle.
  5. Dispositif selon la revendication 1,
    caractérisé en ce que,
    les moulures de formage (5, 7) et lesdits évidements (6, 8) disposés entre les moulures de formage (5, 7) sont disposés en cercle sur la pièce d'outillage supérieure (3) et de la pièce d'outillage inférieure (4).
  6. Dispositif selon l'une des revendications 1 - 5,
    caractérisé en ce que,
    la hauteur des moulures de formage (5, 7) est comprise entre 20 et 120 mm, dans lequel, la hauteur des moulures de formage (5, 7) varie sur leur longueur.
  7. Dispositif selon l'une des revendications 1 - 6,
    caractérisé en ce que,
    la hauteur des moulures de formage (5, 7) est différente sur chacun des côtés de la pièce d'outillage supérieure (3) et/ou de la pièce d'outillage inférieure (4), dans lequel la différence de hauteur entre deux moulures de formage (5, 7) adjacentes est comprise entre 5 et 30 mm.
  8. Dispositif selon l'une des revendications 1 - 7,
    caractérisé en ce que,
    la hauteur des moulures de formage (5, 7) du côté extérieur de la pièce d'outillage supérieure (3) et/ou de la pièce d'outillage inférieure (4) est supérieure à celles du côté intérieur, ou que la hauteur des moulures de formage (5, 7) du côté intérieur de la pièce d'outillage supérieure (3) et/ou de la pièce d'outillage inférieure (4) est supérieure à celles du côté extérieur.
  9. Dispositif selon l'une des revendications 1 - 8,
    caractérisé en ce que,
    la largeur des moulures de formage (5, 7) est comprise entre 10 et 40 mm.
  10. Dispositif selon l'une des revendications 1 - 9,
    caractérisé en ce que,
    les moulures de formage (5, 7) sont incurvées dans le sens de la longueur.
  11. Dispositif selon l'une des revendications 1-10,
    caractérisé en ce que,
    des plaques intercalaires (13) sont disposés respectivement entre les moulures de formage (5, 7) et la pièce d'outillage supérieure (3) et/ou de la pièce d'outillage inférieure (4).
  12. Dispositif selon l'une des revendications 1-11,
    caractérisé en ce que,
    les moulures de formage (5, 7) sont pourvues d'un revêtement.
  13. Dispositif selon l'une des revendications 1 - 12,
    caractérisé en ce que,
    dans un espace intermédiaire (9) entre les moulures de formage (5, 7), est disposé un outil d'emboutissage (10) qui comporte au moins un évidemment (6, 8), un contre-élément (14) amorti par ressorts, et en ce que la moulure de formage (5, 7) à proximité de l'outil d'emboutissage (10) a une forme annulaire.
EP07818526.1A 2006-10-05 2007-09-28 Dispositif de formage des pieces par etirage plan Not-in-force EP2107952B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610047484 DE102006047484A1 (de) 2006-10-05 2006-10-05 Vorrichtung zum ebenen Streckziehen von Werkstücken
PCT/EP2007/008443 WO2008040495A1 (fr) 2006-10-05 2007-09-28 Vorrichtung zum ebenen streckziehen von werkstücken

Publications (2)

Publication Number Publication Date
EP2107952A1 EP2107952A1 (fr) 2009-10-14
EP2107952B1 true EP2107952B1 (fr) 2013-05-08

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07818526.1A Not-in-force EP2107952B1 (fr) 2006-10-05 2007-09-28 Dispositif de formage des pieces par etirage plan

Country Status (3)

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EP (1) EP2107952B1 (fr)
DE (1) DE102006047484A1 (fr)
WO (1) WO2008040495A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009056315A1 (de) * 2009-12-01 2011-06-09 GM Global Technology Operations LLC, ( n. d. Ges. d. Staates Delaware ), Detroit Streckziehvorrichtung und Verfahren zum Streckziehen eines Werkstücks sowie streckgezogenes Teil
JP5557374B2 (ja) * 2010-01-22 2014-07-23 ダイハツ工業株式会社 プレス成形金型
US9120137B2 (en) 2012-06-01 2015-09-01 Fca Us Llc Stamping apparatus and method of use

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE723220C (de) 1939-06-30 1942-07-31 Henschel Flugzeug Werke A G Faltenhaltung fuer Bleche beim Ziehen
PL85400B1 (fr) 1973-10-30 1976-04-30 Raciborska Fabryka Kotlow Rafakopo
DE19504264A1 (de) 1995-02-09 1996-08-14 Daimler Benz Ag Verfahren und Vorrichtung für Ziehwerkzeuge
DE19504649C1 (de) 1995-02-13 1996-08-22 Daimler Benz Ag Verfahren und Ziehwerkzeug zum Streckziehen von Blechen
US5823040A (en) * 1997-05-02 1998-10-20 Stodd; Ralph P. Method and apparatus for forming a can shell
DE29924494U1 (de) * 1998-11-02 2003-12-11 Alfons Haar Inc., Miamisburg Vorrichtung zur Herstellung eines Deckels aus Blechmaterial

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Publication number Publication date
EP2107952A1 (fr) 2009-10-14
WO2008040495A1 (fr) 2008-04-10
DE102006047484A1 (de) 2008-04-10

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