EP2107952A1 - Dispositif de formage des pieces par etirage plan - Google Patents

Dispositif de formage des pieces par etirage plan

Info

Publication number
EP2107952A1
EP2107952A1 EP07818526A EP07818526A EP2107952A1 EP 2107952 A1 EP2107952 A1 EP 2107952A1 EP 07818526 A EP07818526 A EP 07818526A EP 07818526 A EP07818526 A EP 07818526A EP 2107952 A1 EP2107952 A1 EP 2107952A1
Authority
EP
European Patent Office
Prior art keywords
umformsicken
tool part
tool
forming
recesses
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.)
Granted
Application number
EP07818526A
Other languages
German (de)
English (en)
Other versions
EP2107952B1 (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

Links

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.
  • DE 195 04 649 C1 describes a method and a drawing tool for stretch drawing of metal sheets.
  • the drawing tool in the region of its outer periphery on a dipping into a trench of the counter tool web.
  • DE 24 50 624 A1 describes a device for pressing deep, thin-walled container bottoms with large diameters, which has a tool insert and an anvil.
  • the tool insert and the counter-holder in turn have a multiple drawing bead, which, as in DE 195 04 264 Al, acts as a hold-down during deep drawing of the workpiece and must apply very high hold-down forces.
  • the forming beads according to the invention 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 invention thus 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 drawn according to the invention in this Umformsickengeometrie, wherein the tensile force is influenced by the geometry of the tool formed by the upper tool part 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. Because the workpiece is dynamic - A -
  • 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.
  • the Umformsicken and located between the Umformsicken recesses are arranged on two opposite sides of the upper tool part and the lower tool part.
  • Such a trained device 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 Ummorficken 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 20 - 120 mm so on the one hand, a sufficient penetration depth of the Umformsicken in the corresponding recesses and thus a correspondingly strong deformation of the workpiece to achieve a corresponding effect in the flat ironing guaranteed and it prevents the other that the Umformsicken due to too high a height of the same can bend.
  • the height of the Umformsicken varies over the length thereof.
  • a variation of the tensile force induced in the workpiece can be achieved if the Umformsicken the tool upper part and / or the lower tool part are designed so that they engage at different times with the recesses of the lower tool part and / or the upper tool.
  • One way of realizing the penetration of the Umformsi- cken 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.
  • 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 is a highly schematic representation of the device according to the invention with a tool upper part, a lower tool part and in addition a deep-drawing tool.
  • FIG. 2 shows a first embodiment of the forming beads according to the invention in a first state;
  • FIG. 3 shows the device from FIG. 2 in a second state
  • FIG. 4 shows the device from FIG. 2 in a third state
  • FIG. 5 shows a second embodiment of the embossing beads according to the invention in a first state
  • FIG. 6 shows the device from FIG. 5 in a second state
  • FIG. 7 shows the device from FIG. 5 in a third state
  • FIG. 10 is a plan view of the device according to the invention with a first configuration of the Umformsicken;
  • FIG. 11 is a plan view of the device according to the invention with a second configuration of the Umformsicken;
  • FIG. 12 shows a plan view of the device according to the invention with a further configuration of the forming beads
  • FIG. 13 is a plan view of the device according to the invention with a further configuration of the Umformsicken.
  • FIG. 14 shows a top view of the device according to the invention with a further configuration of the forming beads;
  • FIG. 16 is a plan view of the device according to the invention with a further configuration of the Umformsicken;
  • FIG. 17 shows a plan view of the device according to the invention with a further configuration of the forming beads
  • FIG. 19 shows a top view of the device according to the invention with a further configuration of the forming beads
  • FIG. 20 shows a plan view of the device according to the invention with a further configuration of the forming beads
  • FIG. 21 shows a plan view of the device according to the invention with a further configuration of the forming beads
  • FIG. 22 shows a further embodiment of the device according to the invention in a first operating state
  • FIG. 23 shows the device from FIG. 22 in a second operating state
  • FIG. 24 shows the device from FIG. 22 in a third operating state
  • FIG. FIG. 25 shows a further embodiment of the device according to the invention in a first operating state
  • FIG. 26 shows the device from FIG. 25 in a second operating state
  • FIG. 27 shows the device from FIG. 25 in a third operating state.
  • the device 1 shows a device 1 for the flat stretch-forming of a workpiece 2, represented 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 Umforgesicken 7, which engage in respective recesses 8 of the upper tool part 3.
  • the Umformsicken 5 and 7 may be provided with a coating tion, for example, to influence the required forming forces.
  • thermoforming 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 show a first embodiment of the upper tool part 3 and of the lower tool part 4 and in particular of the outer mold beads 5 and 7 thereof.
  • 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, ⁇ b and 6c.
  • between the innermost Umsummsicke 7c and one for placing the workpiece 2 serving Maschinen Swissaufläge 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.
  • 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 die upper part 3 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 edges of the forming beads 5 and 7 facing the workpiece 2 are provided with radii whose size lies in particular in a range of 1 to 20 mm, in particular 2 to 10 mm.
  • 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 differently sized 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 upper 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 correspond to the information on the embodiment of Figures 2, 3 and 4, wherein the Umformsicken 5a - 5d of the upper tool part 3 have smaller radii than in the previous embodiment ,
  • the forming beads 5 and 7 have a substantially rectangular cross-section in the height direction, with the above-mentioned different radii being located on the side facing the workpiece 2 can. It has been found to be particularly suitable when the width of the Umformsicken is 10 - 40 mm.
  • FIGS. 10-21 show various embodiments of the arrangement of the forming beads 5 and / or 7 on the upper tool part 3 and / or the lower die part 4.
  • the upper die part 3 is shown with the forming beads 5, but the arrangement is of course also valid for the Forming beads 7 of the tool lower 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, on the broad side of the upper die 3 and the lower die part 4 are arranged.
  • 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 and located between the Umformsicken 5 and 7 recesses 6 and 8 are arranged on four sides of the upper tool part 3 and the lower die part 4. In each case two of the four sides are opposite each other. Similar to the embodiments of FIGS. 10 to 15, here as well bent forming beads 5 and 7 and recesses 6 and 8 can be used along their length.
  • 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 can also be seen in the embodiment of Fig. 21, in which the Umformsicken 5 and 7 and located therebetween recesses 6 and 8 are arranged in a circle on the upper die 3 and the lower tool part 4.
  • the Umformsicken 5 and 7 and located therebetween recesses 6 and 8 are arranged in a circle on the upper die 3 and the lower tool part 4.
  • FIGS. 22, 23 and 24 show an embodiment of the device 1 in which respective shim plates 13 are arranged between the forming beads 5 and the upper die 3, by which the penetration depth of the Umformsicken 5 can be influenced in the workpiece 2, if different heights Shims 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.
  • the device 1 has a hold-down element 14 which is arranged between the upper die part 3 and the lower die part 2a and on the other hand, in particular by means of at least one gas spring, which is capable of wrapping around the work piece 2 to improve.
  • a hold-down element 14 which is arranged between the upper die part 3 and the lower die part 2a and on the other hand, in particular by means of at least one gas spring, which is capable of wrapping around the work piece 2 to improve.
  • a hold-down element 14 which is arranged between the upper die part 3 and the lower die part 2a and on the other hand, in particular by means of at least one gas spring, which is capable of wrapping around the work piece 2 to improve.
  • a hold-down element 14 which is arranged between the upper die part 3 and the lower die part 2a and on the other hand, in particular by means of at least one gas spring, which is capable of wrapping around the work piece 2 to improve.
  • the recesses 6 and / or 8 may be provided in one or more of the recesses 6 and /
  • the deep-drawing tool 10 is again provided. seen, by means of which the workpiece 2 is not only just stretched during its processing, but also deep drawn after the flat ironing.
  • the forming die 5 closest to the deep-drawing tool 10 may be formed as a draw ring.

Landscapes

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

Abstract

Eine Vorrichtung zum ebenen Streckziehen von Werkstücken, weist ein Werkzeugoberteil und ein mit dem Werkzeugoberteil in Eingriff gehendes Werkzeugunterteil auf, welche relativ zueinander beweglich sind. Sowohl das Werkzeugoberteil als auch das Werkzeugunterteil weisen jeweils auf wenigstens zwei Seiten jeweils wenigstens zwei voneinander beabstandete Umformsicken auf, welche in jeweilige korrespondierende Ausnehmungen des Werkzeugunterteils oder des Werkzeugoberteils eingreifen.
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 true EP2107952A1 (fr) 2009-10-14
EP2107952B1 EP2107952B1 (fr) 2013-05-08

Family

ID=38719976

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)

Country Link
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008040495A1 *

Also Published As

Publication number Publication date
DE102006047484A1 (de) 2008-04-10
WO2008040495A1 (fr) 2008-04-10
EP2107952B1 (fr) 2013-05-08

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