EP2335841B1 - Method for producing bent elements and tool for same - Google Patents

Method for producing bent elements and tool for same Download PDF

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Publication number
EP2335841B1
EP2335841B1 EP09015634.0A EP09015634A EP2335841B1 EP 2335841 B1 EP2335841 B1 EP 2335841B1 EP 09015634 A EP09015634 A EP 09015634A EP 2335841 B1 EP2335841 B1 EP 2335841B1
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EP
European Patent Office
Prior art keywords
stage
embossing
blank
fine
forming
Prior art date
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Application number
EP09015634.0A
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German (de)
French (fr)
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EP2335841A1 (en
Inventor
Sven Dipl.-Ing. Hoftstetter
Willi Dipl.-Ing. Grimm
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Feintool International Holding AG
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Feintool International Holding AG
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Priority to EP09015634.0A priority Critical patent/EP2335841B1/en
Publication of EP2335841A1 publication Critical patent/EP2335841A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00Shaping by press-cutting; Perforating
    • B21D28/02Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/06Making more than one part out of the same blank; Scrapless working
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D35/00Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D43/00Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/28Associations of cutting devices therewith

Definitions

  • the invention relates to a method for producing bent parts, in which cut from a clamped between the upper and lower part of a tool strip a one-piece blank in a at least one guide plate, die, punch and ejector comprehensive fine cutting stage, the blank then in a forming stage in its predetermined Form cold bent and from this the finished part is discharged, the fineblanking stage is driven by a hydraulic system.
  • the invention further relates to a follow-on composite tool for producing bent parts a top and bottom part with at least one for cutting a blank from a strip strip provided fine cutting stage, which contains at least one guide or pressing plate, a die, a cutting punch and an ejector, and with a bending die, scraper and counter-bearing forming stage for bending the blank in a predetermined shape, wherein the fine cutting stage is connected to a hydraulic drive system and the tool holds the tape strip clamped in the closed state and releases in the open state.
  • switching elements such as fork legs and operating levers in one piece from a sheet metal strip by contour punching (see DE 102 12 245 A1 . DE 102 61 209 A1 ).
  • the fork legs and operating levers are bent and pressed into their predetermined shape and position by means of bending and forming tools in a cold forming process.
  • the sheet metal strip is fed by a coil of a punching and forming device, in which at the same time successive - depending on the type of processing, however, sometimes also simultaneously taking place processing steps, in particular stamping, bending and pressing are made.
  • the contour punching machining in one or more of the first stations initially remains limited to the punching of the essential parts of the shift fork and the Austanzen of the central portion of the fork back as a separating cut, with the shift fork is released from the sheet metal strip, takes place only in the terminal.
  • the invention has for its object to provide a method and a tool for producing bent parts, in which the step of deburring is integrated into the cutting and forming step, wherein the accuracy of the parts increases by eliminating the Trowal iss extends the life of the tool and parts and the cost is significantly reduced by saving the separate deburring.
  • the solution according to the invention is based on the knowledge of performing the fineblanking, deburring and bending operations within a common process in a progressive compound tool.
  • the invention is characterized in that the blank is fed after a complete re-cutting in the fine cutting stage an embossing step for embossing the ridge and then the forming stage, the cut blank completely remains in the cutting opening below the die plane and the blank after embossing in the embossing stage is held down by a force additionally generated with a separate drive system in a lying below the die plane of the fine blanking level until a cross slide is retracted horizontally into the open tool below the tape strip, then the retracted cross slide against the cutting direction of the cutting opening in a Recorded level above the Matrizenebene back blank and this by further displacement of the cross slide in the normal direction to the feed direction of the tape strip in the embossing stage and the previously embossed Zusc Spent in the forming stage spends, and that after the bending process
  • the cross slide in addition to its displacement function also the correct position supplying the blanks in the respective embossing stage and forming stage, so that the blanks position accurately in the respective stages and can be centered by spring force.
  • a further advantage is that the steps of the method according to the invention can be carried out in a progressive tool within a working stroke, whereby the investment costs compared to the prior art significantly reduce productivity and can be increased while increasing the accuracy of the parts.
  • embossing dies are used for burr embossing, which have a defined embossing radius. This ensures that the radius impressed on the cutting contour is very constant compared to the tumbling and has a uniform surface structure.
  • At least two blanks arranged side by side can be completely cut out of the strip strip in separate fine cutting steps at the same time.
  • at least two cross slides are present, which operate in opposite directions with respect to the feed direction of the tape strip at 90 °.
  • each fine blanking stage is assigned an embossing step upstream of the forming step, the embossing step and the forming step being connected to an additional drive system for separately feeding the blank with an additional force for temporarily holding the blanks in the embossing step below a plane of the die plane and for ejecting are connected to the finished bending part of the forming stage, and that embossing step and forming stage are arranged with respect to the fine cutting stage normal to the feed direction of the tape strip and coupled by a common cross slide, with the tool open between the upper and lower part below the tape strip horizontally in alignment of the die plane for detecting and moving the blank from the fine cutting step to the embossing step and from the embossing step to the forming step as well as for discharging the finished bending part from the tool on
  • the cross slide is after its retraction in a arranged such position for fine blanking stage and embossing stage that he capture the completely cut, pushed back from the cutting opening of the die by the ejector in the die plane blank and with its horizontal movement the blank at 90 ° to the advancing movement along the located below the strip strip die level in the opposite the fine cutting stage offset in the direction of displacement movement outwardly arranged, at least stamping die, inner mold punch, holding punch and Subgeambos composite embossing stage for embossing the ridge on the cutting contour of the blank and in the opposite to the embossing stage turn outward in the direction of displacement movement arranged Umformla can move, the latter connected to a ramp for free-falling discharge of the finished bent part from the tool.
  • a further preferred embodiment of the tool according to the invention provides that at least two successively arranged in the feed direction of the tape strip fine cutting stages are provided, the embossing steps and forming stages are arranged to each other in the normal direction to the feed direction of the tape strip, the cross slide these stages are aligned in opposite directions to each other.
  • the solution according to the invention if only one fine cutting step, one embossing step and one forming step are provided for bending, to which a single transverse slide is assigned.
  • the embossing stage has at least one upper and lower drive system and the forming stage at least one further drive system, which are independent of each other, whereby a separate loading of the active elements of embossing stage and forming stage is made possible.
  • the additional drive systems can be hydraulically, pneumatically or mechanically driven without departing from the invention.
  • the cross slide has a flat planar shape, which is provided with two successively, in the feed direction receiving openings, which are adapted to the shape of the blanks.
  • a receiving opening in the cross slide of the fine cutting stage and the embossing stage, the other receiving opening, however, associated with the forming stage, the receiving opening for the fine cutting stage and the embossing stage circumferentially closed and the receiving opening for the forming stage is frontally open.
  • the receiving openings of the cross slide are provided with fixing elements that hold the blanks positionally accurate during the move and correct position of each stage perform.
  • the die has a defined embossing radius. This ensures that the burr embossed cutting contour obtains a high degree of uniformity and accuracy.
  • the Fig. 1 shows in plan view an example of a progressive compound tool 1, with the bending parts 2, for example, as in Fig. 2 illustrated shift rails for automatic transmission of a car made of metallic material, to be produced by the novel process.
  • the follow-on composite tool 1 comprises in this example a fine-cutting stage 3, an embossing stage 4 and a forming stage 5, which are interconnected by a cross-slide 6 (see Fig. 3 ) are coupled.
  • two fine cutting stages 3 are provided, which are arranged so close to each other that from the reel, not shown supplied strip of tape 7 two blanks 8 can be cut for the shift rail simultaneously in a complete fine cutting process.
  • the contour of the bending part 2 is completely cut out in the fine cutting stage 3.
  • Each fine cutting stage 3 are thus associated with a stamping stage 4 and a forming stage 5.
  • the respective blanks 8 are supplied to a perpendicular to the feed direction VR of the tape strip 7 outwardly laid embossing step 4 for embossing of the resulting fineblanking burr and then the forming stage 5 for performing a bending operation on the embossed blank 8.1 in its intended final shape as a bent part 2.
  • the forming stage 5 is in turn arranged offset relative to the embossing stage 4 to the outside, so that the finished bending parts 2 can be removed by ramps 9 twice falling from the tool.
  • embossing stage 4 and bending stage 5 it is also part of the solution according to the invention, if only ever one fine cutting stage 3, embossing stage 4 and bending stage 5 is present.
  • Fig. 2a shows the completely cut out of the tape strip 7 flat blank 8 in the state before the burr embossing and the forming operation.
  • the blank 8 has an elongated portion 10 with ends 11 and 12, wherein the ends 11 and 12 lie on a common longitudinal axis A.
  • the middle region of the section 10 merges into a tab-like projection 13.
  • the Fig. 2b represents the state of the reshaped blank as a finished bent part 2 in its final form, ie after the burr embossing and the bending operation.
  • the tab-like projection 13 is bent at a defined angle whose deviation from the angle specification must be very low.
  • the fineblanking step 3, the embossing step 4 and the forming step 5 are coupled by the cross slide 6, ie the cross slide 6 detects the blanks 8 completely cut in the fine cutting step 3 and transports the blanks 8 to the embossing step 4 and the blank embossed blank 8.1 to the forming step 5
  • Fig. 3 shows a perspective view of a lower part 14 of the progressive tool 1 with according to the fine cutting stage 3, embossing stage 4 and bending stage 5 associated transverse slides 6.
  • the cross slide 6 are formed with open tool between the upper part 15 and lower part 14 on the die plane ME below the plane of the tape strip 7 movable and are slidably guided along the fine cutting stage 3, the embossing step 4 and the forming stage 5 on guide rails 16, wherein the transverse slide 6 are each arranged perpendicular to the feed direction VR of the tape strip 7 and offset from each other according to the positions of the two fine cutting stages 3.
  • the pneumatically or otherwise driven cross slide 6 work in opposite directions, ie they detect the blanks 8 and perform these opposite the fineblanking stage 3 each vertically outwardly staggered embossing stage 4 and forming stage 5 to.
  • the fineblanking stage 3, the embossing stage 4 and the forming stage 5 are positioned far enough from each other so that the cross slide 6 can spend the blanks 8 and 8.1 of the fineblanking stage 3 in the embossing stage 4 and of the embossing stage 4 in the forming stage 5 in time of the opening of the tool ,
  • the cross slide 6 has an elongated flat shape and has in its flat flat portion 17 a well-closed receiving opening 18 for encompassing of the fine cutting stage 3 completely cut out Blank 8, wherein the receiving opening 18 is adapted to the shape of the blank 8.
  • the receiving opening 18 is provided with fixing elements 19, for example claws, which allow a positionally correct fixing of the blank 8 in the receiving opening 18.
  • the receiving opening 18 has approximately the shape of in Fig. 2a
  • a further receiving opening 20 which is opposite to the receiving opening 18 to the bending stage 5 out offset in the cross slide 6 and open to the outside, so that after the bending process in the forming stage 5, the finished bent part 2 can be removed by the respective ramp 9.
  • Fig. 4a to 4c is the basic structure of the fineblanking stage 3, embossing stage 4 and bending stage 5 of the progressive tool 1 in the open state shown schematically.
  • the fineblanking stage 3 consists essentially of a guide plate 21, a die 22, a cutting punch 23, ejector 24, inner mold punch 25 and an ejector 26 which are arranged according to their function to be exercised in the upper block or sub-block of the progressive tool 1.
  • the guide plate 21, the cutting punch 23, the ejector 24, inner mold punch 25 and ejector 26 are connected via corresponding piston / cylinder units not shown with a hydraulic system 27 which generates the corresponding pressure forces for the fine cutting operation and the active elements applies.
  • the fine-cutting stage 3 corresponds to the known prior art, so that it is possible to dispense with a more detailed illustration. In the following, only the special features of the fineblanking stage are highlighted.
  • the hydraulic system 27 of the fine cutting stage 3 is designed so that the guide plate 21 and the ejector 26 are held under pressure when opening the progressive tool 1, so that the stripping of the stamped grid and the expulsion of the Butzens 28 takes place immediately and the slugs 28 on the die plane remain lying in order to be removed with the cross slide 6 when retracted from the progressive tool 1.
  • the embossing step 4 (see Fig. 4b ) comprises a bell-shaped embossing punch 30 which is fixedly connected to the pressure plate 33 with the top block 31.
  • the ejector 36 is guided vertically, in which the inner mold embossment 37 is guided, which also stands firmly on the pressure plate 33.
  • the ejector is connected via compression springs 35 and the pressure plate 34 with the auxiliary hydraulic 32.
  • a lower additional hydraulic system 39 is provided, which acts on the embossing team 40 via a piston not shown in order to press the embossed blank 8.1 controlled at a later time after retraction of the cross slide 6 in the fixing elements 19.
  • an internal punch 41 for stamping a defined draw in on the inner contour of the blank 8.1 and a holding punch 42 in the vertical alignment of the stamp 30 for the outer contour are guided in a sliding manner, wherein inner form stampers 41 and retaining stamps 42 are firmly on a pressure plate on the sub-block 38.
  • Embossing dies 30, inner embossing dies 41 and holding dies 42 can have different embossing radii, which are selected according to the desired geometrical relationships of the inner and outer contours of the bent parts 2.
  • the cross slide 6 is located in retracted non-engagement position PA outside the engagement zone of the die 30, inner form stampers 41 and retaining stamp 42nd It is understood that the upper and lower auxiliary hydraulics 32 and 39 can be replaced by a pneumatic or mechanical drive system, without departing from the invention.
  • the forming stage 5 contains as Fig. 4c shows a scraper 43 and a punch 44, which are resiliently fixed in a mounted on the top block 31 pressure plate 45 in each separate bearings 46, wherein the spring axis FA of the scraper 43 and the spring axis FB of the punch 44 are aligned perpendicular to each other.
  • Forming stage 5 further includes an abutment 47 and an about the axis B in the ejector pivotally formed bending jaw 48 and an ejector 49, by a provided in the sub-block 38 of the forming stage 5 further lower auxiliary hydraulics 50 vertically above or below the die plane ME of Fine cutting stage 3 is retractable and extendable.
  • the bending jaw 48 By retracting the auxiliary hydraulic 50, the bending jaw 48 is pivoted about the axis B by means of the abutment 47. In this case, the embossed blank 8.1 between the ejector 49, the punch 44 and the wiper 43 is clamped.
  • the extension of the auxiliary hydraulic 50 is carried out simultaneously as the auxiliary hydraulic system 39 of the embossing stage 4, to press the finished bending part 2 of the> forming stage 5 in the transverse splitter 6, so that the part can be subsequently applied via the ramp 9
  • the lower auxiliary hydraulic 50 of the bending stage 5 is also a pneumatic or mechanical drive can be used.
  • the inventive method runs according to the in Fig. 4a to 9c shown steps as follows.
  • the follow-on composite tool 1 is open.
  • the upper block 31 and the tape strip 7 are located in a plane substantially above the die plane ME arranged level.
  • the cross slide 6 is extended from the fine cutting stage 3, the embossing stage 4 and the forming stage 5, ie it is located in the rear disengaged position PA.
  • a cut-to-size cutout 8.1 is located for stamping the burr on the cutting contour.
  • Such a ridge embossed blank 8 was also stored by the cross slide 6 in the forming stage 5 for bending.
  • the die plane ME of the fineblanking stage 3, the recuperatorambosebene GE of the embossing stage 4 and the Biegebackbene BE of the forming stage 5 match (see Fig. 4a to 4c ).
  • the tool is ready for the stroke.
  • Fig. 5a to 5c is the follow-on composite tool 1 shown closed and the tape strip 7 and the blanks 8 and 8.1 are clamped between the upper part 15 and lower part 14.
  • the closing of the tool takes place by approaching the lower part 14 to the upper part 15.
  • the tape strip 7 is clamped between guide or pressing plate 21 and the ejector 24.
  • the blank 8.1 in the embossing stage 4 is between ejector 36th and inner form stampers 41 clamped and in the forming stage 5, the scraper 45 and the punch 45 is centered with respect to the ridge embossed blank 8.1 by the resilient bearings 46.
  • the bending process begins.
  • Fig. 6a to 6c show the beginning of the cut in the embossing step 3, wherein the cutting punch 23 has run back through the force acting on the ratchet hydraulic system 27.
  • the blank 8.1 is centered by the springs 35 in the bending punch 30.
  • Embossing stamp 30 and inner mold embossing 41 and the holding stamp 42 are ready to intervene.
  • the forming stage 5 of the bending operation which is triggered by a pivoting of the bending jaw 48 about the axis B due to the effectiveness of the auxiliary hydraulic 50 and the thrust bearing 47.
  • the cutting punch 23 has cut out the blank 8 on all sides from the tape strip 7.
  • the blank 8 lies in the cutting opening of the die 22 below the die plane ME.
  • the blank 8.1 is flash-embossed on its outer contour and inner contour and lies above in alignment of the die plane ME in the forming stage 5.
  • the bending process is completed (see Fig. 7b and 7c ).
  • the progressive tool 1 is shown by moving the lower part 14 from the upper part 15 in the open state ( Fig. 8a to 8c ).
  • the completely cut-out blank 8 is fixed in the cutting opening of the die 22 in a plane below the die plane ME ( Fig. 8a ) and the ridge-embossed blank 8.1 is held down in this plane by an additionally hydraulically generated spring force ( Fig. 8b ).
  • the finished bent part 2 was moved to a position well below the die plane ME by means of the auxiliary hydraulic 50 during the bending operation ( Fig. 8c ).
  • the additional hydraulic 32 in the top block 31 of the embossing stage 4 is not switched off in the open state of the tool and thus acts on the blanks 8 and 8.1 as a hold-down force, so that the blank 8.1 comes to lie below the die plane ME, and on the other hand, the auxiliary hydraulic 50 causes the lowering of the blank 8.1 when bending below the die plane ME.
  • the die plane ME is thus exposed below the tape strip 7 and allows the horizontal retraction of the cross slide 6 from its disengaged position PA (see Fig. 4a to 4c ) in a position for receiving the blanks 8 and 8.1 and the finished bending part. 2
  • the Fig. 9a to 9c illustrate the step of horizontal retraction of the cross slide 6 along the die plane ME in the open progressive die 1.
  • the cross slide 6 is moved by a pneumatic actuator not shown so far with its receiving openings 18 and 20 horizontally to the latter centered on the fine cutting stage 3 and the embossing stage. 4 are positioned and the respective receiving openings the respective blanks 8 and 8.1 can encompass or capture, wherein the slug 28 is pushed out of the tool.
  • the blank 8 is pushed back out of the cutting opening of the die 22 from the plane below the die plane ME into the plane above the die plane ME.
  • the blank 8 is then in the receiving opening 18 of the cross slide.
  • the lower auxiliary hydraulic system 39 has vertically raised the blank 8.1 embossed in the embossing stage 4 via the piston and the embossing team 40 so that the blank 8.1 lies in alignment with the plane above the die plane ME and can be grasped by the receiving opening 20 of the transverse slide 6 ( Fig. 9b ).
  • the actuated by the lower auxiliary hydraulic 50 ejector 49 in the forming stage 5 has the finished bent part 2 in alignment over the die plane ME vertically raised so far that the bent part 2 is above the die plane ME.
  • the cross slide 6 then moves as far as the receiving opening 18 is centrally above the embossing step 4 and the blank 8 can be stored in the embossing stage 4 correct position.
  • the further receiving opening 20 of the cross slide 6 has the ridge embossed blank 8.1 at the same time shifted positionally correct in the forming stage 5, where the blank 8.1 is centered and bent.
  • the finished bent part 2 is discharged via the ramp 9. The tool closes and the next stroke can begin.
  • the burr embossing in the embossing stage 4 allows the removal of the burr within a process, resulting in edge rounding with uniform surface structure at the cutting edge and precise radius of the cutting edge.
  • the precision and accuracy of the bending parts is increased.
  • the removal of the burr within the machining process within the tool further leads to the tool life increase.
  • the inventive method leads to a very stable Production with high reproducibility, since all dimensions are tool-bound. The costs for quality assurance are reduced and the test cycle can be extended accordingly.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Biegeteilen, bei dem aus einem zwischen Ober- und Unterteil eines Werkzeuges geklemmten Bandstreifen ein einteiliger Zuschnitt in einer zumindest eine Führungsplatte, Matrize, Schneidstempel und Auswerfer umfassende Feinschneidstufe zugeschnitten, der Zuschnitt anschließend in einer Umformstufe in seine vorgegebene Form kalt gebogen und aus dieser das fertige Teil abgeführt wird, wobei die Feinschneidstufe von einem hydraulischen System angetrieben wird.The invention relates to a method for producing bent parts, in which cut from a clamped between the upper and lower part of a tool strip a one-piece blank in a at least one guide plate, die, punch and ejector comprehensive fine cutting stage, the blank then in a forming stage in its predetermined Form cold bent and from this the finished part is discharged, the fineblanking stage is driven by a hydraulic system.

Die Erfindung betrifft ferner ein Folgeverbundwerkzeug zum Herstellen von Biegeteilen, aus einem Ober- und Unterteil mit mindestens einer zum Ausschneiden eines Zuschnitts aus einem Bandstreifen vorgesehenen Feinschneidstufe, die wenigstens eine Führungs- bzw. Pressplatte, eine Matrize, einen Schneidstempel und einen Auswerfer enthält, und mit einer aus Biegestempel, Abstreifer und Gegenlager zusammengesetzten Umformstufe zum Biegen des Zuschnitts in eine vorgegebene Form, wobei die Feinschneidstufe an ein hydraulisches Antriebssystem angeschlossen ist und das Werkzeug im geschlossenen Zustand den Bandstreifen klemmend hält und im geöffneten Zustand freigibt.The invention further relates to a follow-on composite tool for producing bent parts a top and bottom part with at least one for cutting a blank from a strip strip provided fine cutting stage, which contains at least one guide or pressing plate, a die, a cutting punch and an ejector, and with a bending die, scraper and counter-bearing forming stage for bending the blank in a predetermined shape, wherein the fine cutting stage is connected to a hydraulic drive system and the tool holds the tape strip clamped in the closed state and releases in the open state.

Stand der TechnikState of the art

Es ist bekannt, Schaltelemente wie Gabelschenkel und Betätigungshebel einteilig aus einem Blechstreifen durch Konturstanzen herzustellen (siehe DE 102 12 245 A1 , DE 102 61 209 A1 ). Die Gabelschenkel und Betätigungshebel werden mittels Biege- und Umformwerkzeuge in einem Kaltumformungsprozess in ihre vorgegebene Form und Position gebogen und gepresst. Der Blechstreifen wird von einem Coil einer Stanz- und Umformeinrichtung zugeführt, in denen im Wesentlichen zur gleichen Zeit aufeinanderfolgende -je nach Art der Bearbeitung jedoch teilweise auch gleichzeitig erfolgende Bearbeitungsschritte, insbesondere Stanzen, Biegen und Pressen vorgenommen werden. Die Konturstanzbearbeitung in einer oder in mehreren der ersten Stationen bleibt zunächst auf das Ausstanzen der wesentlichen Teile der Schaltgabel beschränkt und das Austanzen des Mittelabschnitts des Gabelrückens als Trennschnitt, mit dem die Schaltgabel aus dem Blechstreifen gelöst wird, erfolgt erst in der Endstation.It is known to produce switching elements such as fork legs and operating levers in one piece from a sheet metal strip by contour punching (see DE 102 12 245 A1 . DE 102 61 209 A1 ). The fork legs and operating levers are bent and pressed into their predetermined shape and position by means of bending and forming tools in a cold forming process. The sheet metal strip is fed by a coil of a punching and forming device, in which at the same time successive - depending on the type of processing, however, sometimes also simultaneously taking place processing steps, in particular stamping, bending and pressing are made. The contour punching machining in one or more of the first stations initially remains limited to the punching of the essential parts of the shift fork and the Austanzen of the central portion of the fork back as a separating cut, with the shift fork is released from the sheet metal strip, takes place only in the terminal.

Des Weiteren ist aus der DE 103 26 870 B3 ein Verfahren zur Herstellung eines Getriebeschaltelements wie Schienenteil und Gabelteil aus Metall bekannt, bei dem der Schienenteil und der Gabelteil als Feinschneidteile zugeschnitten und durch Biegen und/oder Pressen weiter geformt werden.Furthermore, from the DE 103 26 870 B3 a method for producing a gear shift element such as rail part and fork part made of metal, in which the rail part and the fork part are cut as fine blanking parts and further formed by bending and / or pressing.

Der Nachteil all dieser bekannten technischen Lösungen besteht darin, dass der beim Stanzen entstehende Grat an den Teilen erhalten bleibt und durch alle Bearbeitungsstationen hindurch geschleppt wird, was einerseits dazu führt, dass der Grat an der fertigen Teil durch ein nachfolgendes aufwändiges Entgraten, beispielweise ein die Genauigkeit der Teile beeinträchtigendes Trowalisieren, entfernt werden muss, und andererseits der Grat die Bearbeitungsqualität der Teile, insbesondere ihre Genauigkeit und die Standzeit der Werkzeuge herabsetzt.The disadvantage of all these known technical solutions is that the burr resulting from the punching is retained on the parts and towed through all the processing stations, which on the one hand leads to the burr on the finished part by a subsequent complex deburring, for example, a On the other hand, the burr reduces the machining quality of the parts, in particular their accuracy and tool life.

Aufgabenstellungtask

Bei diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren und ein Werkzeug zum Herstellen von Biegeteilen bereitzustellen, in dem der Arbeitsschritt des Entgratens in den Schneid- und Umformschritt integriert wird, wobei die Genauigkeit der Teile durch den Wegfall des Trowalisierens erhöht, die Standzeit des Werkzeugs und der Teile verlängert und der Aufwand durch die Einsparung des separaten Entgratens wesentlich reduziert wird.In this prior art, the invention has for its object to provide a method and a tool for producing bent parts, in which the step of deburring is integrated into the cutting and forming step, wherein the accuracy of the parts increases by eliminating the Trowalisierens extends the life of the tool and parts and the cost is significantly reduced by saving the separate deburring.

Diese Aufgabe wird durch ein Verfahren der eingangs genannten Gattung mit den Merkmalen des Anspruchs 1 und durch ein Werkzeug mit den Merkmalen des Anspruchs 7 gelöst.This task is accomplished by a procedure of the beginning mentioned genus with the features of claim 1 and solved by a tool with the features of claim 7.

Vorteilhafte Ausgestaltungen des Verfahrens und Werkzeugs sind den Unteransprüchen entnehmbar.Advantageous embodiments of the method and tool are the dependent claims.

Die erfindungsgemäße Lösung geht von der Erkenntnis aus, die Operationen Feinschneiden, Entgraten und Biegen innerhalb eines gemeinsamen Prozesses in einem Folgeverbundwerkzeug durchzuführen.
Die Erfindung zeichnet sich dadurch aus, dass der Zuschnitt nach einem kompletten Umschnitt in der Feinschneidstufe einer Prägestufe zum Verprägen des Grates und anschließend der Umformstufe zugeführt wird, wobei der komplett ausgeschnittene Zuschnitt solange in der Schneidöffnung unterhalb des Matrizenebene verbleibt und der Zuschnitt nach dem Verprägen in der Prägestufe durch eine mit einem separaten Antriebssystem zusätzlich erzeugte Kraft in einer unterhalb der Matrizenebene der Feinschneidstufe gelegenen Ebene solange niedergehalten wird bis ein Querschieber in das geöffnete Werkzeug unterhalb des Bandstreifens horizontal eingefahren ist, dann der eingefahrene Querschieber den entgegen der Schneidrichtung aus der Schneidöffnung in eine Ebene oberhalb der Matrizenebene zurückgedrückten Zuschnitt erfasst und diesen durch ein weiteres Verschieben des Querschiebers in normaler Richtung zur Vorschubrichtung des Bandstreifens in die Prägestufe und den zuvor verprägten Zuschnitt in die Umformstufe lagegerecht verbringt, und dass nach dem Biegevorgang durch eine weitere erzeugte Kraft das fertige Biegeteil aus der Umformstufe in den Querschieber gedrückt wird, der das Biegeteil lageorientiert aus dem geöffneten Werkzeug verbringt, wobei das Erfassen der Teile in allen Stufen durch den Querschieber gleichzeitig erfolgt.
Natürlich kann die erfindungsgemäße Lösung auch überall dort zum Einsatz gebracht werden, wo Teile eine bestimmte funktionsbedingte Biegekontur besitzen müssen.
The solution according to the invention is based on the knowledge of performing the fineblanking, deburring and bending operations within a common process in a progressive compound tool.
The invention is characterized in that the blank is fed after a complete re-cutting in the fine cutting stage an embossing step for embossing the ridge and then the forming stage, the cut blank completely remains in the cutting opening below the die plane and the blank after embossing in the embossing stage is held down by a force additionally generated with a separate drive system in a lying below the die plane of the fine blanking level until a cross slide is retracted horizontally into the open tool below the tape strip, then the retracted cross slide against the cutting direction of the cutting opening in a Recorded level above the Matrizenebene back blank and this by further displacement of the cross slide in the normal direction to the feed direction of the tape strip in the embossing stage and the previously embossed Zusc Spent in the forming stage spends, and that after the bending process by a further force generated the finished bent part is pressed from the forming stage in the cross slide, which spends the bending part position-oriented from the open tool, wherein the detection the parts in all stages by the cross slide simultaneously.
Of course, the solution according to the invention can also be used everywhere where parts have to have a certain function-related bending contour.

In einer bevorzugten Ausführungsvariante läuft das erfindungsgemäße Verfahren während eines Arbeitshubes taktweise in folgenden Arbeitsschritten ab:

  1. a) Schließen des Werkzeugs und Klemmen des Bandstreifens zwischen Ober- und Unterteil,
  2. b) vollständiges Ausschneiden mindestens eines Zuschnitte aus dem Bandstreifen in der Feinschneidstufe,
  3. c) Festhalten des Zuschnitts unterhalb der Matrizenebene in der Schneidöffnung der Matrize der Feinschneidstufe, Niederhalten des Zuschnitts in der Prägestufe und Absenken des verprägten Zuschnitts in der Umformstufe unterhalb der Matrizenebene durch die zusätzlich erzeugten Federkräfte beim Öffnen des Werkzeugs,
  4. d) horizontales Einfahren eines von in Bezug auf die Vorschubrichtung des Bandstreifens unter 90° arbeitenden Querschiebers zwischen Ober- und Unterteil unterhalb des Bandstreifens in eine Position über der Schneidstufe und der Prägestufe zum Erfassen der jeweiligen Zuschnitte auf der Matrizenebene,
  5. e) Zurückdrücken des in der Schneidöffnung der Feinschneidstufe liegenden Zuschnitts in eine Ebene oberhalb der Matrizenebene durch den Auswerfer in der Feinschneidstufe, Freigeben des niedergehaltenen verprägten Zuschnitts und Anheben der Zuschnitte durch die separaten voneinander unabhängigen Antriebssystemen in der Prägestufe und Umformstufe,
  6. f) Erfassen des in die Ebene oberhalb der Matrizenebene zurückgedrückten und freigegebenen Zuschnitts durch den Querschieber und horizontales Zuführen des Zuschnitts in die jeweils gegenüber der Feinschneidstufe nach außen versetzte Prägestufe und Umformstufe durch ein Verfahren der Querschieber aus der Erfassungsposition der Feinschneidstufe bis in die Position der Prägestufe und anschließend aus der Erfassungsposition der Prägestufe in die Position der Umformstufe unter gleichzeitigem Ausbringen des fertigen Biegeteils aus dem Werkzeug durch den Querschieber,
  7. g) Schließen des Werkzeugs und erneutes simultan ablaufendes Feinschneiden in der Feinschneidstufe, Verprägen des Grates in der Prägestufe und Biegen des verprägten Zuschnitts in der Umformstufe.
In a preferred embodiment, the method according to the invention cycles during a working stroke in the following work steps:
  1. a) closing the tool and clamping the tape strip between upper and lower part,
  2. b) completely cutting out at least one blank from the strip strip in the fineblanking stage,
  3. c) holding the blank below the die plane in the cutting opening of the die of the fineblanking stage, holding down the blank in the embossing step and lowering the embossed blank in the forming step below the die plane by the additionally generated spring forces when opening the tool,
  4. d) horizontal retraction of a cross slide operating at 90 ° with respect to the feed direction of the tape strip, between the upper and lower part below the tape strip, into a position above the cutting step and the embossing step for detecting the respective cuts on the die plane,
  5. e) pushing back in the cutting opening of Fine blanking stage lying blank in a plane above the die plane through the ejector in the fine blanking stage, releasing the held down embossed blank and lifting the blanks by the separate independent drive systems in the embossing stage and forming stage,
  6. f) detecting the blank pushed back into the plane above the die plane and released by the cross slide and horizontally feeding the blank into the embossing step and forming step outwardly offset relative to the fine cutting step by moving the cross slide out of the detection position of the fine cutting step into the position of the embossing step and then from the detection position of the embossing stage in the position of the forming stage while simultaneously applying the finished bending part of the tool by the cross slide,
  7. g) Closing the tool and resuming simultaneous fineblanking in the fineblanking step, embossing the burr in the embossing step and bending the embossed blank in the forming step.

Von besonderem Vorteil ist weiterhin, dass es mit voneinander unabhängigen hydraulischen und/oder mechanischen und/oder pneumatischen Antrieben für die Prägestufe und Umformstufe möglich wird, auf die Wirkelemente der Stufen definierte Kräfte separat aufzubringen, die in ihrer Höhe auf den Kräftebedarf zum Niederhalten der Zuschnitte auf eine Ebene unterhalb der Matrizenebene oder Anheben der Zuschnitte auf eine Ebene oberhalb der Matrizenebene entsprechend abgestimmt und eingestellt werden können.Of particular advantage is further that it is possible with independent hydraulic and / or mechanical and / or pneumatic drives for the embossing stage and forming stage, applied to the active elements of the stages defined forces separately, the height of the forces required to hold down the blanks can be adjusted and adjusted to a level below the Matrizenebene or raising the blanks to a level above the Matrizenebene.

Nach einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Verfahren übernimmt der Querschieber neben seiner Verschiebefunktion auch das lagegerechte Zuführen der Zuschnitte in die jeweilige Prägestufe und Umformstufe, so dass die Zuschnitte positionsgenau in die jeweilige Stufen einfahren und durch Federkraft zentriert werden können.According to a further preferred embodiment of the method according to the invention, the cross slide in addition to its displacement function also the correct position supplying the blanks in the respective embossing stage and forming stage, so that the blanks position accurately in the respective stages and can be centered by spring force.

In weiterer Ausgestaltung des erfindungsgemäßen Verfahrens werden mindestens zwei nebeneinander angeordnete Zuschnitte aus dem Bandstreifen in jeweils separaten Feinschneidstufen, Prägestufen und Umformstufen gleichzeitig bearbeitet, wobei je Feinschneidstufe, Prägestufe und Umformstufe gemeinsame Querschieber vorhanden sind, die in Bezug auf die Vorschubrichtung des Bandstreifens unter 90° zueinander gegenläufig arbeiten.In a further embodiment of the method according to the invention at least two juxtaposed blanks from the tape strip in each separate fine cutting stages, embossing stages and forming stages are processed simultaneously, each fine cutting stage, embossing stage and forming common cross slide are present, with respect to the feed direction of the tape strip at 90 ° to each other working in opposite directions.

Von Vorteil ist weiterhin, dass die Arbeitsschritte des erfindungsgemäßen Verfahrens in einem Folgeverbundwerkzeug innerhalb eines Arbeitshubes durchgeführt werden können, wodurch sich die Investitionskosten gegenüber dem Stand der Technik erheblich reduzieren und die Produktivität bei gleichzeitiger Erhöhung der Genauigkeit der Teile erhöht werden kann.A further advantage is that the steps of the method according to the invention can be carried out in a progressive tool within a working stroke, whereby the investment costs compared to the prior art significantly reduce productivity and can be increased while increasing the accuracy of the parts.

Nach einer bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens werden zum Gratverprägen Prägestempel verwendet, die einen definierten Prägeradius besitzen. Dies stellt sicher, dass der an die Schneidkontur angeprägte Radius im Vergleich zum Trowalisieren sehr konstant ist und eine gleichmäßige Oberflächenstruktur aufweist.According to a preferred embodiment of the method embossing dies are used for burr embossing, which have a defined embossing radius. This ensures that the radius impressed on the cutting contour is very constant compared to the tumbling and has a uniform surface structure.

In weiterer Ausgestaltung des erfindungsgemäßen Verfahrens können mindestens zwei nebeneinander angeordnete Zuschnitte aus dem Bandstreifen in jeweils separaten Feinschneidstufen gleichzeitig komplett ausgeschnitten werden. Für diesen Fall sind mindestens zwei Querschieber vorhanden, die in Bezug auf die Vorschubrichtung des Bandstreifens unter 90° zueinander gegenläufig arbeiten.In a further embodiment of the method according to the invention, at least two blanks arranged side by side can be completely cut out of the strip strip in separate fine cutting steps at the same time. In this case, at least two cross slides are present, which operate in opposite directions with respect to the feed direction of the tape strip at 90 °.

Das erfindungsgemäße Werkzeug ist einfach und kompakt aufgebaut und hat den großen Vorteil, dass das Feinschneiden, das Gratverprägen und das Biegen der Teile innerhalb eines Prozesses durchgeführt werden können. Mit anderen Worten jeder Feinschneidstufe ist eine der Umformstufe vorgeordnete Prägestufe zugeordnet ist, wobei die Prägestufe und die Umformstufe an ein zusätzliches Abtriebssystem zum separaten Beaufschlagen des Zuschnitts mit einer zusätzlichen Kraft für ein zeitweiliges Niederhalten der Zuschnitte in der Prägestufe unterhalb einer Ebene der Matrizenebene und zum Ausstoßen des fertigen Biegeteils aus der Umformstufe angeschlossen sind, und dass Prägestufe und Umformstufe in bezug auf die Feinschneidstufe normal zur Vorschubrichtung des Bandstreifens angeordnet und durch einen gemeinsamen Querschieber gekoppelt sind, der bei geöffnetem Werkzeug zwischen Ober- und Unterteil unterhalb des Bandstreifens horizontal in Flucht der Matrizenebene zum Erfassen und Verschieben des Zuschnitts von der Feinschneidstufe zur Prägestufe und von der Prägestufe zur Umformstufe sowie zum Ausbringen des fertigen Biegeteils aus dem Werkzeug ein- und herausfahrbar ausgebildet ist.The tool according to the invention has a simple and compact design and has the great advantage that the fine blanking, the burr embossing and the bending of the parts can be carried out within one process. In other words, each fine blanking stage is assigned an embossing step upstream of the forming step, the embossing step and the forming step being connected to an additional drive system for separately feeding the blank with an additional force for temporarily holding the blanks in the embossing step below a plane of the die plane and for ejecting are connected to the finished bending part of the forming stage, and that embossing step and forming stage are arranged with respect to the fine cutting stage normal to the feed direction of the tape strip and coupled by a common cross slide, with the tool open between the upper and lower part below the tape strip horizontally in alignment of the die plane for detecting and moving the blank from the fine cutting step to the embossing step and from the embossing step to the forming step as well as for discharging the finished bending part from the tool on and out is formed.

In weiterer Ausgestaltung des erfindungsgemäßen Werkzeugs ist der Querschieber nach seinem Einfahren in einer solchen Position zur Feinschneidstufe und Prägestufe angeordnet, dass er den komplett ausgeschnittenen, aus der Schneidöffnung der Matrize durch den Auswerfer in die Matrizenebene zurückgedrückten Zuschnitt erfassen und mit seiner horizontalen Bewegung den Zuschnitt unter 90° zur Vorschubbewegung entlang der unterhalb des Bandstreifens gelegenen Matrizenebene in die gegenüber der Feinschneidstufe in Richtung Verschiebebewegung nach außen versetzt angeordnete, mindestens aus Prägestempel, Innenformstempel, Haltestempel und Prägeambos zusammengesetzte Prägestufe zum Verprägen des Grats an der Schnittkontur des Zuschnitts und in die gegenüber der Prägestufe wiederum nach außen in Richtung Verschiebebewegung versetzt angeordnete Umformstufe verschieben kann, wobei letztere mit einer Rampe zum freifallenden Abführen des fertigen Biegeteils aus dem Werkzeug verbunden ist.In a further embodiment of the tool according to the invention, the cross slide is after its retraction in a arranged such position for fine blanking stage and embossing stage that he capture the completely cut, pushed back from the cutting opening of the die by the ejector in the die plane blank and with its horizontal movement the blank at 90 ° to the advancing movement along the located below the strip strip die level in the opposite the fine cutting stage offset in the direction of displacement movement outwardly arranged, at least stamping die, inner mold punch, holding punch and Prägeambos composite embossing stage for embossing the ridge on the cutting contour of the blank and in the opposite to the embossing stage turn outward in the direction of displacement movement arranged Umformstufe can move, the latter connected to a ramp for free-falling discharge of the finished bent part from the tool.

Eine weitere bevorzugte Ausführungsvariante des erfindungsgemäßen Werkzeugs sieht vor, dass mindestens zwei hintereinander in Vorschubrichtung des Bandstreifens angeordnete Feinschneidstufen vorgesehen sind, deren Prägestufen und Umformstufen zueinander in normaler Richtung zur Vorschubrichtung des Bandstreifens angeordnet sind, wobei die Querschieber dieser Stufen zueinander gegenläufig arbeitend ausgerichtet sind.
Es gehört natürlich auch zur erfindungsgemäßen Lösung, wenn nur eine Feinschneidstufe, eine Prägestufe und eine Umformstufe zum Biegen vorgesehen sind, dem ein einziger Querschieber zugeordnet ist.
A further preferred embodiment of the tool according to the invention provides that at least two successively arranged in the feed direction of the tape strip fine cutting stages are provided, the embossing steps and forming stages are arranged to each other in the normal direction to the feed direction of the tape strip, the cross slide these stages are aligned in opposite directions to each other.
Of course, it is also part of the solution according to the invention if only one fine cutting step, one embossing step and one forming step are provided for bending, to which a single transverse slide is assigned.

In weiterer Ausbildung der Erfindung weist die Prägestufe mindestens ein oberes und unteres Antriebssystem und die Umformstufe mindestens ein weiteres Antriebssystem auf, die voneinander unabhängig sind, wodurch ein separates Beaufschlagen der Wirkelemente von Prägestufe und Umformstufe ermöglicht wird.
Es versteht sich, dass die zusätzlichen Antriebssysteme hydraulisch, pneumatisch oder mechanisch angetrieben sein können, ohne die Erfindung zu verlassen.
In a further embodiment of the invention, the embossing stage has at least one upper and lower drive system and the forming stage at least one further drive system, which are independent of each other, whereby a separate loading of the active elements of embossing stage and forming stage is made possible.
It is understood that the additional drive systems can be hydraulically, pneumatically or mechanically driven without departing from the invention.

Nach einer erfindungsgemäßen Weiterbildung hat der Querschieber eine flache ebene Form, die mit zwei hintereinander, in Vorschubrichtung liegenden Aufnahmeöffnungen versehen ist, welche an die Form der Zuschnitte angepasst sind.According to a development of the invention, the cross slide has a flat planar shape, which is provided with two successively, in the feed direction receiving openings, which are adapted to the shape of the blanks.

Zweckmäßigerweise ist eine Aufnahmeöffnung im Querschieber der Feinschneidstufe und der Prägestufe, die andere Aufnahmeöffnung jedoch der Umformstufe zugeordnet, wobei die Aufnahmeöffnung für die Feinschneidestufe und die Prägestufe umlaufend geschlossen und die Aufnahmeöffnung für die Umformstufe stirnseitig offen ausgebildet ist.Conveniently, a receiving opening in the cross slide of the fine cutting stage and the embossing stage, the other receiving opening, however, associated with the forming stage, the receiving opening for the fine cutting stage and the embossing stage circumferentially closed and the receiving opening for the forming stage is frontally open.

Nach Anspruch 15 sind die Aufnahmeöffnungen des Querschiebers mit Fixierelementen versehen, die die Zuschnitte positionsgenau während des Verschiebens halten und lagegerecht der jeweiligen Stufe zuführen.According to claim 15, the receiving openings of the cross slide are provided with fixing elements that hold the blanks positionally accurate during the move and correct position of each stage perform.

In weiterer Ausgestaltung des erfindungsgemäßen Werkzeugs ist vorgesehen, dass der Prägestempel einen definierten Prägeradius aufweist. Dies stellt sicher, dass die gratverprägte Schneidkontur eine hohe Gleichmäßigkeit und Genauigkeit erhält.In a further embodiment of the tool according to the invention it is provided that the die has a defined embossing radius. This ensures that the burr embossed cutting contour obtains a high degree of uniformity and accuracy.

Weitere Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung unter Bezugnahme auf die beigefügten Zeichnungen.Further advantages and details will become apparent from the following description with reference to the accompanying drawings.

Ausführungsbeispielembodiment

Die Erfindung soll nachstehend an einem Ausführungsbeispiel näher erläutert werden.The invention will be explained in more detail below using an exemplary embodiment.

Es zeigenShow it

  • Fig. 1 eine Draufsicht des erfindungsgemäßen Werkzeugs mit jeweils senkrecht zur Bandvorschubrichtung angeordneten Feinschneidstufen, Prägestufen und Biegestufen, deren Querschieber zueinander gegenläufig arbeiten, Fig. 1 a plan view of the tool according to the invention with each arranged perpendicular to the tape feed direction fine cutting stages, embossing stages and bending stages, the cross slide work in opposite directions,
  • Fig. 2a und 2b eine perspektivische Darstellung des Zuschnitts und des fertigen Biegeteils, Fig. 2a and 2b a perspective view of the blank and the finished bent part,
  • Fig. 3 eine perspektivische Ansicht des Unterteils des erfindungsgemäßen Folgeverbundwerkzeugs, Fig. 3 a perspective view of the lower part of the progressive compound tool according to the invention,
  • Fig. 4a bis 4c jeweils eine schematische Schnittdarstellung von Feinschneidstufe, Prägestufe und Biegestufe im geöffneten Zustand des Werkzeugs, Fig. 4a to 4c each a schematic sectional view of fineblanking stage, embossing stage and bending stage in the open state of the tool,
  • Fig. 5a bis 5c eine schematische Schnittdarstellung von Feinschneidstufe, Prägestufe und Biegestufe im geschlossenen Zustand des Werkzeug zwischen Ober- und Unterteil geklemmten Bandstreifen und Zuschnitten, Fig. 5a to 5c a schematic sectional view of fineblanking stage, embossing step and bending stage in the closed state of the tool between the upper and lower part clamped tape strips and blanks,
  • Fig. 6a bis 6c die Feinschneidstufe bei Schnittbeginn, die Prägestufe nach Zentrierung des Zuschnitts und die Umformstufe bei laufendem Biegevorgang in schematischer Darstellung, Fig. 6a to 6c the fineblanking stage Beginning of cut, the embossing step after centering of the blank and the forming step during the bending process in a schematic representation,
  • Fig. 7a bis 7c die Feinschneidstufe mit vollständig ausgeschnittenen Zuschnitt, die Prägestufe mit gratverprägtem Zuschnitt und die Umformstufe mit fertig gebogenem Zuschnitt in schematischer Darstellung bei geschlossenem Werkzeug, Fig. 7a to 7c the fineblanking stage with fully cut blank, the embossing step with burr-embossed blank and the forming step with ready-cut blank in schematic representation with the tool closed,
  • Fig. 8a bis 6c die Feinschneidstufe mit vollständig ausgeschnittenem Zuschnitt, die Prägestufe mit gratverprägtem Zuschnitt und die Umformstufe mit fertig gebogenem Biegeteil in schematischer Darstellung bei geöffnetem Werkzeug, Fig. 8a to 6c the fine-cutting stage with fully cut blank, the embossing step with burr-embossed blank and the forming stage with finished bent bending part in a schematic representation with the tool open,
  • Fig. 9a bis 9c eine schematische Darstellung von Feinschneidstufe, Prägestufe und Umformstufe mit durch den eingefahrenen Querschieber erfassten Zuschnitten, Fig. 9a to 9c a schematic representation of fine blanking stage, embossing stage and forming stage with detected by the retracted cross slide blanks,

Die Fig. 1 zeigt in Draufsicht ein Beispiel eines Folgeverbundwerkzeugs 1, mit dem Biegeteile 2, beispielsweise wie in Fig. 2 dargestellte Schaltschienen für Automatikgetriebe eines Pkw aus metallischem Werkstoff, nach dem erfindungsgemäßen Verfahren hergestellt werden sollen. Das Folgeverbundwerkzeug 1 umfasst in diesem Beispiel eine Feinschneidstufe 3, eine Prägestufe 4 und eine Umformstufe 5, die miteinander durch einen Querschieber 6 (siehe Fig. 3) gekoppelt sind.The Fig. 1 shows in plan view an example of a progressive compound tool 1, with the bending parts 2, for example, as in Fig. 2 illustrated shift rails for automatic transmission of a car made of metallic material, to be produced by the novel process. The follow-on composite tool 1 comprises in this example a fine-cutting stage 3, an embossing stage 4 and a forming stage 5, which are interconnected by a cross-slide 6 (see Fig. 3 ) are coupled.

Im vorliegenden Beispiel sind zwei Feinschneidstufen 3 vorgesehen, die so nahe aneinander angeordnet sind, dass aus dem über nicht dargestellte Haspeln zugeführten Bandstreifen 7 zwei Zuschnitte 8 für die Schaltschiene gleichzeitig in einem kompletten Feinschneidvorgang ausgeschnitten werden können. Mit anderen Worten, die Kontur des Biegeteiles 2 wird in der Feinschneidstufe 3 vollständig ausgeschnitten. Jeder Feinschneidstufe 3 sind damit eine Prägestufe 4 und eine Umformstufe 5 zugeordnet. Die jeweiligen Zuschnitte 8 werden einer senkrecht zur Vorschubrichtung VR des Bandstreifens 7 nach außen verlegten Prägestufe 4 zum Verprägen des beim Feinschneiden entstandenen Grates und dann der Umformstufe 5 zum Ausführen einer Biegeoperation an dem verprägten Zuschnitt 8.1 in seine vorgesehene Endform als Biegeteil 2 zugeführt. Die Umformstufe 5 liegt wiederum gegenüber der Prägestufe 4 nach außen versetzt angeordnet, so dass die fertigen Biegeteile 2 jeweils durch Rampen 9 zweifach fallend aus dem Werkzeug abgeführt werden können. Natürlich gehört es auch zur erfindungsgemäßen Lösung, wenn nur je eine Feinschneidstufe 3, Prägestufe 4 und Biegestufe 5 vorhanden ist.In the present example, two fine cutting stages 3 are provided, which are arranged so close to each other that from the reel, not shown supplied strip of tape 7 two blanks 8 can be cut for the shift rail simultaneously in a complete fine cutting process. In other words, the contour of the bending part 2 is completely cut out in the fine cutting stage 3. Each fine cutting stage 3 are thus associated with a stamping stage 4 and a forming stage 5. The respective blanks 8 are supplied to a perpendicular to the feed direction VR of the tape strip 7 outwardly laid embossing step 4 for embossing of the resulting fineblanking burr and then the forming stage 5 for performing a bending operation on the embossed blank 8.1 in its intended final shape as a bent part 2. The forming stage 5 is in turn arranged offset relative to the embossing stage 4 to the outside, so that the finished bending parts 2 can be removed by ramps 9 twice falling from the tool. Of course, it is also part of the solution according to the invention, if only ever one fine cutting stage 3, embossing stage 4 and bending stage 5 is present.

Fig. 2a zeigt den aus dem Bandstreifen 7 vollständig ausgeschnittenen ebenen Zuschnitt 8 im Zustand vor dem Gratverprägen und der Umformoperation. Der Zuschnitt 8 hat einen langgestreckten Abschnitt 10 mit Enden 11 und 12, wobei die Enden 11 und 12 auf einer gemeinsamen Längsachse A liegen. Der mittlere Bereich des Abschnitts 10 geht in einen laschenartigen Ansatz 13 über.
Die Fig. 2b stellt den Zustand des umgeformten Zuschnitts als fertiges Biegeteil 2 in seiner Endform, d.h. nach dem Gratverprägen und der Biegeoperation, dar. Der laschenartige Ansatz 13 ist unter einem definierten Winkel abgebogen, dessen Abweichung von der Winkelvorgabe sehr gering sein muss.
Fig. 2a shows the completely cut out of the tape strip 7 flat blank 8 in the state before the burr embossing and the forming operation. The blank 8 has an elongated portion 10 with ends 11 and 12, wherein the ends 11 and 12 lie on a common longitudinal axis A. The middle region of the section 10 merges into a tab-like projection 13.
The Fig. 2b represents the state of the reshaped blank as a finished bent part 2 in its final form, ie after the burr embossing and the bending operation. The tab-like projection 13 is bent at a defined angle whose deviation from the angle specification must be very low.

Die Feinschneidstufe 3, die Prägestufe 4 und die Umformstufe 5 sind durch den Querschieber 6 gekoppelt, d.h. der Querschieber 6 erfasst die in der Feinschneidstufe 3 vollständig ausgeschnittenen Zuschnitte 8 und transportiert die Zuschnitte 8 zur Prägestufe 4 und den gratverprägten Zuschnitt 8.1 zur Umformstufe 5. Die Fig. 3 zeigt eine perspektivische Ansicht eines Unterteils 14 des Folgeverbundwerkzeugs 1 mit entsprechend der Feinschneidstufe 3, Prägestufe 4 und Biegestufe 5 zugeordneten Querschiebern 6. Die Querschieber 6 sind bei geöffnetem Werkzeug zwischen Oberteil 15 und Unterteil 14 auf der Matrizenebene ME unterhalb der Ebene des Bandstreifens 7 verfahrbar ausgebildet und werden entlang der Feinschneidstufe 3, der Prägestufe 4 und der Umformstufe 5 an Führungsschienen 16 gleitend geführt, wobei die Querschieber 6 jeweils senkrecht zur Vorschubrichtung VR des Bandstreifens 7 angeordnet und gegeneinander entsprechend der Positionen der beiden Feinschneidstufen 3 versetzt sind. Die pneumatisch oder anderweitig angetriebenen Querschieber 6 arbeiten zueinander gegenläufig, d.h. sie erfassen die Zuschnitte 8 und führen diese der gegenüber der Feinschneidstufe 3 jeweils senkrecht nach außen versetzten Prägestufe 4 und Umformstufe 5 zu. Die Feinschneidstufe 3, die Prägestufe 4 und die Umformstufe 5 sind voneinander soweit positioniert, dass der Querschieber 6 in Takt der Öffnung des Werkzeugs die Zuschnitte 8 und 8.1 von der Feinschneidstufe 3 in die Prägestufe 4 und von der Prägestufe 4 in die Umformstufe 5 verbringen kann.The fineblanking step 3, the embossing step 4 and the forming step 5 are coupled by the cross slide 6, ie the cross slide 6 detects the blanks 8 completely cut in the fine cutting step 3 and transports the blanks 8 to the embossing step 4 and the blank embossed blank 8.1 to the forming step 5 Fig. 3 shows a perspective view of a lower part 14 of the progressive tool 1 with according to the fine cutting stage 3, embossing stage 4 and bending stage 5 associated transverse slides 6. The cross slide 6 are formed with open tool between the upper part 15 and lower part 14 on the die plane ME below the plane of the tape strip 7 movable and are slidably guided along the fine cutting stage 3, the embossing step 4 and the forming stage 5 on guide rails 16, wherein the transverse slide 6 are each arranged perpendicular to the feed direction VR of the tape strip 7 and offset from each other according to the positions of the two fine cutting stages 3. The pneumatically or otherwise driven cross slide 6 work in opposite directions, ie they detect the blanks 8 and perform these opposite the fineblanking stage 3 each vertically outwardly staggered embossing stage 4 and forming stage 5 to. The fineblanking stage 3, the embossing stage 4 and the forming stage 5 are positioned far enough from each other so that the cross slide 6 can spend the blanks 8 and 8.1 of the fineblanking stage 3 in the embossing stage 4 and of the embossing stage 4 in the forming stage 5 in time of the opening of the tool ,

Der Querschieber 6 hat eine langgestreckte flache Form und besitzt in seinem flachen ebenen Teil 17 eine allseits geschlossene Aufnahmeöffnung 18 zum Umfassen des von der Feinschneidstufe 3 vollständig ausgeschnittenen Zuschnitts 8, wobei die Aufnahmeöffnung 18 an die Form des Zuschnitts 8 angepasst ist. Die Aufnahmeöffnung 18 ist mit Fixierelementen 19, beispielsweise Klauen, versehen, die eine lagegerechte Fixierung des Zuschnitts 8 in der Aufnahmeöffnung 18 erlauben. Im vorliegenden Ausführungsbeispiel hat die Aufnahmeöffnung 18 annähernd die Form des in Fig. 2a näher beschriebenen Zuschnitts 8. Neben der Aufnahmeöffnung 18 besitzt der Querschieber 6 in seinem flachen ebenen Teil 17 eine weitere Aufnahmeöffnung 20, die gegenüber der Aufnahmeöffnung 18 zur Biegestufe 5 hin versetzt im Querschieber 6 angeordnet und nach außen offen ausgebildet ist, so dass nach dem Biegevorgang in der Umformstufe 5 das fertige Biegeteil 2 durch die jeweilige Rampe 9 abgeführt werden kann.The cross slide 6 has an elongated flat shape and has in its flat flat portion 17 a well-closed receiving opening 18 for encompassing of the fine cutting stage 3 completely cut out Blank 8, wherein the receiving opening 18 is adapted to the shape of the blank 8. The receiving opening 18 is provided with fixing elements 19, for example claws, which allow a positionally correct fixing of the blank 8 in the receiving opening 18. In the present embodiment, the receiving opening 18 has approximately the shape of in Fig. 2a In addition to the receiving opening 18 of the cross slide 6 has in its flat flat portion 17 has a further receiving opening 20 which is opposite to the receiving opening 18 to the bending stage 5 out offset in the cross slide 6 and open to the outside, so that after the bending process in the forming stage 5, the finished bent part 2 can be removed by the respective ramp 9.

In Fig. 4a bis 4c ist der prinzipielle Aufbau der Feinschneidestufe 3, Prägestufe 4 und Biegestufe 5 des Folgeverbundwerkzeugs 1 im geöffneten Zustand schematisch dargestellt.In Fig. 4a to 4c is the basic structure of the fineblanking stage 3, embossing stage 4 and bending stage 5 of the progressive tool 1 in the open state shown schematically.

Die Feinschneidstufe 3 setzt sich im Wesentlichen aus einer Führungsplatte 21, einer Matrize 22, einem Schneidstempel 23, Auswerfer 24, Innenformstempel 25 und einem Ausstosser 26 zusammen, die gemäß ihrer auszuübenden Funktion im Oberblock bzw. Unterblock des Folgeverbundwerkzeugs 1 angeordnet sind.
Die Führungsplatte 21, der Schneidstempel 23, der Auswerfer 24, Innenformstempel 25 und Ausstosser 26 sind über entsprechende nicht weiter dargestellte Kolben/Zylindereinheiten mit einem hydraulischen System 27 verbunden, das die entsprechenden Druckkräfte für die Feinschneidoperation erzeugt und auf die Wirkelemente aufbringt. Im Übrigen entspricht die Feinschneidstufe 3 dem bekannten Stand der Technik, so dass auf eine weitergehende Darstellung verzichtet werden kann. Im Folgenden werden nur die Besonderheiten der Feinschneidstufe hervorgehoben.
The fineblanking stage 3 consists essentially of a guide plate 21, a die 22, a cutting punch 23, ejector 24, inner mold punch 25 and an ejector 26 which are arranged according to their function to be exercised in the upper block or sub-block of the progressive tool 1.
The guide plate 21, the cutting punch 23, the ejector 24, inner mold punch 25 and ejector 26 are connected via corresponding piston / cylinder units not shown with a hydraulic system 27 which generates the corresponding pressure forces for the fine cutting operation and the active elements applies. Incidentally, the fine-cutting stage 3 corresponds to the known prior art, so that it is possible to dispense with a more detailed illustration. In the following, only the special features of the fineblanking stage are highlighted.

Das hydraulische System 27 der Feinschneidstufe 3 ist dabei so ausgelegt, dass die Führungsplatte 21 und der Ausstosser 26 beim Öffnen des Folgeverbundwerkzeugs 1 unter Druck gehalten werden, damit das Abstreifen des Stanzgitters und das Ausstossen des Butzens 28 sofort erfolgt und die Butzen 28 auf der Matrizenebene liegen bleiben, um mit dem Querschieber 6 beim Einfahren aus dem Folgeverbundwerkzeug 1 abgeführt werden können.The hydraulic system 27 of the fine cutting stage 3 is designed so that the guide plate 21 and the ejector 26 are held under pressure when opening the progressive tool 1, so that the stripping of the stamped grid and the expulsion of the Butzens 28 takes place immediately and the slugs 28 on the die plane remain lying in order to be removed with the cross slide 6 when retracted from the progressive tool 1.

Die Prägestufe 4 (siehe Fig. 4b) umfasst einen glockenartig ausgebildeten Prägestempel 30, der fest mit der Druckplatte 33 mit dem Oberblock 31 verbunden ist.
Innerhalb des Prägestempels 30 ist der Auswerfer 36 vertikal geführt, in dem der Innenformpräger 37 geführt wird, welcher ebenfalls fest auf der Druckplatte 33 steht.
Der Auswerfer ist über Druckfedern 35 und der Druckplatte 34 mit der Zusatzhydraulik 32 verbunden.
Im Unterblock 38 der Prägestufe 4 ist eine untere Zusatzhydraulik 39 vorgesehen, die über ein nicht weiter dargestellten Kolben auf den Prägeambos 40 wirkt, um den verprägten Zuschnitt 8.1 zu einem späteren Zeitpunkt nach dem Einfahren des Querschiebers 6 gesteuert in die Fixierelemente 19 zu drücken.
Im Prägeamboss 40 sind weiterhin ein Innenformpräger 41 zum Verprägen eines definierten Einzugs an der Innenkontur des Zuschnitts 8.1 und ein Haltestempel 42 in vertikaler Flucht des Prägestempels 30 für die Außenkontur gleitend geführt, wobei Innenformpräger 41 und Haltestempel 42 fest über eine Druckplatte auf dem Unterblock 38 stehen.
Prägestempel 30, Innenformpräger 41 und Haltestempel 42 können verschiedene Prägeradien besitzen, die je nach den gewünschten geometrischen Verhältnissen der Innen- und Außenkontur der Biegeteile 2 ausgewählt werden. Der Querschieber 6 befindet sich in zurückgefahrener Nichteingriffsposition PA außerhalb der Eingriffszone von Prägestempel 30, Innenformpräger 41 und Haltestempel 42.
Es versteht sich, dass die obere und untere Zusatzhydraulik 32 bzw. 39 durch ein pneumatisches oder mechanisches Antriebssystem ersetzt werden kann, ohne die Erfindung zu verlassen.
The embossing step 4 (see Fig. 4b ) comprises a bell-shaped embossing punch 30 which is fixedly connected to the pressure plate 33 with the top block 31.
Within the embossing die 30, the ejector 36 is guided vertically, in which the inner mold embossment 37 is guided, which also stands firmly on the pressure plate 33.
The ejector is connected via compression springs 35 and the pressure plate 34 with the auxiliary hydraulic 32.
In the sub-block 38 of the embossing stage 4, a lower additional hydraulic system 39 is provided, which acts on the embossing team 40 via a piston not shown in order to press the embossed blank 8.1 controlled at a later time after retraction of the cross slide 6 in the fixing elements 19.
In the stamping boss 40, furthermore, an internal punch 41 for stamping a defined draw in on the inner contour of the blank 8.1 and a holding punch 42 in the vertical alignment of the stamp 30 for the outer contour are guided in a sliding manner, wherein inner form stampers 41 and retaining stamps 42 are firmly on a pressure plate on the sub-block 38.
Embossing dies 30, inner embossing dies 41 and holding dies 42 can have different embossing radii, which are selected according to the desired geometrical relationships of the inner and outer contours of the bent parts 2. The cross slide 6 is located in retracted non-engagement position PA outside the engagement zone of the die 30, inner form stampers 41 and retaining stamp 42nd
It is understood that the upper and lower auxiliary hydraulics 32 and 39 can be replaced by a pneumatic or mechanical drive system, without departing from the invention.

Die Umformstufe 5 enthält wie Fig. 4c zeigt einen Abstreifer 43 und einen Biegestempel 44, die in einer am Oberblock 31 befestigten Druckplatte 45 in jeweils separaten Lagern 46 federnd festgelegt sind, wobei die Federachse FA des Abstreifers 43 und die Federachse FB des Biegestempels 44 zueinander senkrecht ausgerichtet sind.
Zur Umformstufe 5 gehören des Weiteren ein Gegenlager 47 und eine um eine um die Achse B im Auswerfer verschwenkbar ausgebildete Biegebacke 48 und ein Auswerfer 49, der durch eine im Unterblock 38 der Umformstufe 5 vorgesehene weitere untere Zusatzhydraulik 50 vertikal über oder unter die Matrizenebene ME der Feinschneidstufe 3 ein- und ausfahrbar ist. Durch das Einfahren der Zusatzhydraulik 50 wird die Biegebacke 48 mittels des Gegenlagers 47 um die Achse B geschwenkt. Dabei wird der verprägte Zuschnitt 8.1 zwischen dem Auswerfer 49, dem Biegestempel 44 und dem Abstreifer 43 klemmend gehalten. Das Ausfahren der Zusatzhydraulik 50 wird simultan ausgeführt wie die Zusatzhydraulik 39 der Prägestufe 4, um das das fertige Biegeteil 2 der >Umformstufe 5 in den Querscheiber 6 zu drücken, so dass das Teil nachfolgend über die Rampe 9 ausgebracht werden kann
Anstelle der unteren Zusatzhydraulik 50 der Biegestufe 5 ist ebenso ein pneumatischer oder mechanischer Antrieb einsetzbar.
The forming stage 5 contains as Fig. 4c shows a scraper 43 and a punch 44, which are resiliently fixed in a mounted on the top block 31 pressure plate 45 in each separate bearings 46, wherein the spring axis FA of the scraper 43 and the spring axis FB of the punch 44 are aligned perpendicular to each other.
Forming stage 5 further includes an abutment 47 and an about the axis B in the ejector pivotally formed bending jaw 48 and an ejector 49, by a provided in the sub-block 38 of the forming stage 5 further lower auxiliary hydraulics 50 vertically above or below the die plane ME of Fine cutting stage 3 is retractable and extendable. By retracting the auxiliary hydraulic 50, the bending jaw 48 is pivoted about the axis B by means of the abutment 47. In this case, the embossed blank 8.1 between the ejector 49, the punch 44 and the wiper 43 is clamped. The extension of the auxiliary hydraulic 50 is carried out simultaneously as the auxiliary hydraulic system 39 of the embossing stage 4, to press the finished bending part 2 of the> forming stage 5 in the transverse splitter 6, so that the part can be subsequently applied via the ramp 9
Instead of the lower auxiliary hydraulic 50 of the bending stage 5 is also a pneumatic or mechanical drive can be used.

Das erfindungsgemäße Verfahren läuft nach den in Fig. 4a bis 9c dargestellten Schritten wie folgt ab. Das Folgeverbundwerkzeug 1 ist geöffnet. Der Oberblock 31 und der Bandstreifen 7 befinden sich in einer deutlich oberhalb der Matrizenebene ME angeordneten Ebene. Der Querschieber 6 ist aus der Feinschneidstufe 3, der Prägestufe 4 und der Umformstufe 5 ausgefahren, d.h. er befindet sich in der hinteren Nichteingriffsposition PA. In der Prägestufe 4 liegt ein vom Querschieber 6 lagegerechter Zuschnitt 8.1 zum Verprägen des Grates an der Schneidkontur. Ein solch gratverprägter Zuschnitt 8 wurde durch den Querschieber 6 ebenso in die Umformstufe 5 zum Biegen abgelegt. Die Matrizenebene ME der Feinschneidstufe 3, die Prägeambosebene GE der Prägestufe 4 und die Biegebackenebene BE der Umformstufe 5 stimmen überein (siehe Fig. 4a bis 4c). Das Werkzeug ist startbereit für den Hub.The inventive method runs according to the in Fig. 4a to 9c shown steps as follows. The follow-on composite tool 1 is open. The upper block 31 and the tape strip 7 are located in a plane substantially above the die plane ME arranged level. The cross slide 6 is extended from the fine cutting stage 3, the embossing stage 4 and the forming stage 5, ie it is located in the rear disengaged position PA. In the embossing stage 4, a cut-to-size cutout 8.1 is located for stamping the burr on the cutting contour. Such a ridge embossed blank 8 was also stored by the cross slide 6 in the forming stage 5 for bending. The die plane ME of the fineblanking stage 3, the Prägeambosebene GE of the embossing stage 4 and the Biegebackbene BE of the forming stage 5 match (see Fig. 4a to 4c ). The tool is ready for the stroke.

In der Fig. 5a bis 5c ist das Folgeverbundwerkzeug 1 geschlossen dargestellt und der Bandstreifen 7 und die Zuschnitte 8 bzw. 8.1 sind zwischen Oberteil 15 und Unterteil 14 geklemmt. Das Schließen des Werkzeugs erfolgt durch Anfahren des Unterteils 14 an das Oberteil 15. In der Feinschneidstufe 3 liegt der Bandstreifen 7 geklemmt zwischen Führungs- bzw. Pressplatte 21 und dem Auswerfer 24. Der Zuschnitt 8.1 in der Prägestufe 4 ist zwischen Auswerfer 36 und Innenformpräger 41 geklemmt und in der Umformstufe 5 wird der Abstreifer 45 und der Biegestempel 45 in Bezug auf den gratverprägten Zuschnitt 8.1 durch die federnden Lager 46 zentriert. Der Biegevorgang beginnt.In the Fig. 5a to 5c is the follow-on composite tool 1 shown closed and the tape strip 7 and the blanks 8 and 8.1 are clamped between the upper part 15 and lower part 14. The closing of the tool takes place by approaching the lower part 14 to the upper part 15. In the fine cutting stage 3, the tape strip 7 is clamped between guide or pressing plate 21 and the ejector 24. The blank 8.1 in the embossing stage 4 is between ejector 36th and inner form stampers 41 clamped and in the forming stage 5, the scraper 45 and the punch 45 is centered with respect to the ridge embossed blank 8.1 by the resilient bearings 46. The bending process begins.

Die Fig. 6a bis 6c zeigen den Schnittbeginn in der Prägestufe 3, wobei der Schneidstempel 23 durch das auf die Ringzacke wirkende Hydrauliksystem 27 zurückgelaufen ist. In der Prägestufe 5 wird der Zuschnitt 8.1 durch die Federn 35 im Biegestempel 30 zentriert. Prägestempel 30 und Innenformpräger 41 sowie der Haltestempel 42 sind eingriffsbereit. In der Umformstufe 5 läuft der Biegevorgang, der durch ein Verschwenken der Biegebacke 48 um die Achse B infolge des Wirksamwerdens der Zusatzhydraulik 50 und des Gegenlagers 47 ausgelöst wird.The Fig. 6a to 6c show the beginning of the cut in the embossing step 3, wherein the cutting punch 23 has run back through the force acting on the ratchet hydraulic system 27. In the embossing step 5, the blank 8.1 is centered by the springs 35 in the bending punch 30. Embossing stamp 30 and inner mold embossing 41 and the holding stamp 42 are ready to intervene. In the forming stage 5 of the bending operation, which is triggered by a pivoting of the bending jaw 48 about the axis B due to the effectiveness of the auxiliary hydraulic 50 and the thrust bearing 47.

In der Fig. 7a hat der Schneidstempel 23 den Zuschnitt 8 allseitig vom Bandstreifen 7 ausgeschnitten. Der Zuschnitt 8 liegt in der Schneidöffnung der Matrize 22 unterhalb der Matrizenebene ME. Der Zuschnitt 8.1 ist an seiner Außenkontur und Innenkontur gratverprägt und liegt oberhalb in Flucht der Matrizenebene ME in der Umformstufe 5. Der Biegevorgang ist abgeschlossen (siehe Fig. 7b und 7c).In the Fig. 7a the cutting punch 23 has cut out the blank 8 on all sides from the tape strip 7. The blank 8 lies in the cutting opening of the die 22 below the die plane ME. The blank 8.1 is flash-embossed on its outer contour and inner contour and lies above in alignment of the die plane ME in the forming stage 5. The bending process is completed (see Fig. 7b and 7c ).

Das Folgeverbundwerkzeug 1 ist durch Abfahren des Unterteils 14 vom Oberteil 15 im geöffneten Zustand gezeigt (Fig. 8a bis 8c). Der vollständig ausgeschnittene Zuschnitt 8 liegt in der Schneidöffnung der Matrize 22 in einer Ebene unterhalb der Matrizenebene ME fest (Fig. 8a) und der gratverprägte Zuschnitt 8.1 wird in dieser Ebene durch eine zusätzlich hydraulisch erzeugte Federkraft niedergehalten (Fig. 8b).The progressive tool 1 is shown by moving the lower part 14 from the upper part 15 in the open state ( Fig. 8a to 8c ). The completely cut-out blank 8 is fixed in the cutting opening of the die 22 in a plane below the die plane ME ( Fig. 8a ) and the ridge-embossed blank 8.1 is held down in this plane by an additionally hydraulically generated spring force ( Fig. 8b ).

Das fertige Biegeteil 2 wurde in eine Position deutlich unterhalb der Matrizenebene ME mittels der Zusatzhydraulik 50 während des Biegevorgangs verschoben (Fig. 8c).
Dies wird dadurch möglich, dass einerseits die Zusatzhydraulik 32 im Oberblock 31 der Prägestufe 4 im geöffneten Zustand des Werkzeuges nicht abgeschaltet wird und somit auf die Zuschnitte 8 und 8.1 als niederhaltende Kraft wirkt, so dass der Zuschnitt 8.1 unterhalb der Matrizenebene ME zu liegen kommt, und andererseits die Zusatzhydraulik 50 die Absenkung des Zuschnitts 8.1 beim Biegen unterhalb der Matrizenebene ME bewirkt.
Die Matrizenebene ME liegt somit unterhalb des Bandstreifens 7 frei und ermöglicht das horizontale Einfahren des Querschiebers 6 aus dessen Nichteingriffsposition PA (siehe Fig. 4a bis 4c) in eine Position zur Aufnahme der Zuschnitte 8 und 8.1 sowie des fertigen Biegeteils 2.
The finished bent part 2 was moved to a position well below the die plane ME by means of the auxiliary hydraulic 50 during the bending operation ( Fig. 8c ).
This is possible because on the one hand the additional hydraulic 32 in the top block 31 of the embossing stage 4 is not switched off in the open state of the tool and thus acts on the blanks 8 and 8.1 as a hold-down force, so that the blank 8.1 comes to lie below the die plane ME, and on the other hand, the auxiliary hydraulic 50 causes the lowering of the blank 8.1 when bending below the die plane ME.
The die plane ME is thus exposed below the tape strip 7 and allows the horizontal retraction of the cross slide 6 from its disengaged position PA (see Fig. 4a to 4c ) in a position for receiving the blanks 8 and 8.1 and the finished bending part. 2

Die Fig. 9a bis 9c verdeutlichen den Arbeitsschritt des horizontalen Einfahrens des Querschiebers 6 entlang der Matrizenebene ME in das geöffnete Folgeverbundwerkzeug 1. Der Querschieber 6 wird durch einen nicht weiter dargestellten pneumatischen Antrieb soweit mit seinen Aufnahmeöffnungen 18 und 20 horizontal verfahren bis letztere mittig über der Feinschneidstufe 3 und der Prägestufe 4 positioniert sind und die entsprechenden Aufnahmeöffnungen die jeweiligen Zuschnitte 8 bzw. 8.1 um- bzw. erfassen können, wobei der Butzen 28 aus dem Werkzeug geschoben wird.
Nachdem der Querschieber 6 diese Position erreicht hat, beginnt in der Feinschneidstufe 3 das Zurückdrücken des Zuschnitts 8 aus der Schneidöffnung der Matrize 22 von der Ebene unterhalb der Matrizenebene ME in die Ebene oberhalb der Matrizenebene ME. Der Zuschnitt 8 befindet sich dann in der Aufnahmeöffnung 18 des Querschiebers 6.
Simultan dazu hat die untere Zusatzhydraulik 39 den in der Prägestufe 4 gratverprägten Zuschnitt 8.1 über den Kolben und den Prägeambos 40 soweit vertikal angehoben, dass der Zuschnitt 8.1 in Flucht der Ebene oberhalb der Matrizenebene ME liegt und von der Aufnahmeöffnung 20 des Querschiebers 6 erfasst werden kann (Fig. 9b).
Der durch die untere Zusatzhydraulik 50 betätigte Auswerfer 49 in der Umformstufe 5 hat das fertige Biegeteil 2 in Flucht über die Matrizenebene ME vertikal soweit angehoben, dass das Biegeteil 2 oberhalb der Matrizenebene ME liegt.
Der Querschieber 6 verfährt sodann soweit bis die Aufnahmeöffnung 18 mittig über der Prägestufe 4 liegt und der Zuschnitt 8 in der Prägestufe 4 lagegerecht abgelegt werden kann. Die weitere Aufnahmeöffnung 20 des Querschiebers 6 hat den gratverprägten Zuschnitt 8.1 zugleich lagegerecht in die Umformstufe 5 verschoben, wo der Zuschnitt 8.1 zentriert und gebogen wird. Das fertige Biegeteil 2 wird über die Rampe 9 ausgebracht.
Das Werkzeug schließt und der nächste Hub kann beginnen.
The Fig. 9a to 9c illustrate the step of horizontal retraction of the cross slide 6 along the die plane ME in the open progressive die 1. The cross slide 6 is moved by a pneumatic actuator not shown so far with its receiving openings 18 and 20 horizontally to the latter centered on the fine cutting stage 3 and the embossing stage. 4 are positioned and the respective receiving openings the respective blanks 8 and 8.1 can encompass or capture, wherein the slug 28 is pushed out of the tool.
After the cross slide 6 has reached this position, in the fine cutting stage 3, the blank 8 is pushed back out of the cutting opening of the die 22 from the plane below the die plane ME into the plane above the die plane ME. The blank 8 is then in the receiving opening 18 of the cross slide. 6
Simultaneously with this, the lower auxiliary hydraulic system 39 has vertically raised the blank 8.1 embossed in the embossing stage 4 via the piston and the embossing team 40 so that the blank 8.1 lies in alignment with the plane above the die plane ME and can be grasped by the receiving opening 20 of the transverse slide 6 ( Fig. 9b ).
The actuated by the lower auxiliary hydraulic 50 ejector 49 in the forming stage 5 has the finished bent part 2 in alignment over the die plane ME vertically raised so far that the bent part 2 is above the die plane ME.
The cross slide 6 then moves as far as the receiving opening 18 is centrally above the embossing step 4 and the blank 8 can be stored in the embossing stage 4 correct position. The further receiving opening 20 of the cross slide 6 has the ridge embossed blank 8.1 at the same time shifted positionally correct in the forming stage 5, where the blank 8.1 is centered and bent. The finished bent part 2 is discharged via the ramp 9.
The tool closes and the next stroke can begin.

Mit der Erfindung lassen sich folgende Vorteile erreichen. Das Gratverprägen in der Prägestufe 4 ermöglicht die Entfernung des Grates innerhalb eines Prozesses, was zu einer Kantenverrundung mit gleichmäßiger Oberflächenstruktur an der Schneidkante und präzisem Radius der Schneidkante führt.
Die Präzision und Genauigkeit der Biegeteile wird erhöht.
Die Entfernung des Grates innerhalb des Bearbeitungsvorganges innerhalb des Werkzeugs führt zu des Weiteren zur Standzeiterhöhung der Werkzeuge.
Das erfindungsgemäße Verfahren führt zu einer sehr stabilen Fertigung mit einer hohen Reproduzierbarkeit, da alle Maße werkzeugformgebunden sind. Die Kosten für die Qualitätssicherung sinken und der Prüfzyklus kann entsprechend verlängert werden. Bezugszeichenliste Folgeverbundwerkzeug 1 Biegeteile 2 Feinschneidstufe 3 Prägestufe 4 Umformstufe 5 Querschieber 6 Bandstreifen 7 Zuschnitt nach dem Feinschneiden 8 Zuschnitt nach dem Gratverprägen 8.1 Rampen 9 Langgestreckter Abschnitt von 8 10 Enden von 10 11, 12 Laschenartiger Ansatz 13 Unterteil von 1 14 Oberteil von 1 15 Führungsschienen 16 Flacher ebener Teil von 6 17 Geschlossene Aufnahmeöffnung in 6 18 Fixierelement 19 Offene Aufnahmeöffnung in 6 20 Führungsplatte mit Ringzacken 21 Matrize 22 Schneidstempel 23 Auswerfer 24 Innenformstempel 25 Ausstosser 26 Hydraulisches System von 3 27 Abfallbutzen (vom Umschnitt) 28 Prägestempel von 4 30 Oberblock 31 Obere Zusatzhydraulik von 4 32 Druckplatte 33 Deckplatte von 4 34 Federn 35 Auswerfer von 4 36 Innenformpräger 37 Unterblock 38 Untere Zusatzhydraulik von 4 39 Prägeambos 40 unterer Innenformpräger 41 Haltestempel von 42 Abstreifer von 5 43 Biegestempel von 5 44 Pressplatte von 5 45 Federnde Lager von 44, 45 46 Gegenlager von 5 47 Biegebacke von 5 48 Auswerfer von 5 49 Untere Zusatzhydraulik von 5 50 Längsachse von 8 A Schwenkachse von 48 B Biegebackenebene in 5 BE Prägeambosebene GE Federachse von 43 FA Federachse von 44 FB Matrizenebene ME Nichteingriffsposition von 6 PA Vorschubrichtung von 7 VR
With the invention, the following advantages can be achieved. The burr embossing in the embossing stage 4 allows the removal of the burr within a process, resulting in edge rounding with uniform surface structure at the cutting edge and precise radius of the cutting edge.
The precision and accuracy of the bending parts is increased.
The removal of the burr within the machining process within the tool further leads to the tool life increase.
The inventive method leads to a very stable Production with high reproducibility, since all dimensions are tool-bound. The costs for quality assurance are reduced and the test cycle can be extended accordingly. LIST OF REFERENCE NUMBERS Progressive Die 1 bent parts 2 Fine cutting stage 3 embossing stage 4 forming stage 5 cross slide 6 tape strips 7 Cutting after fineblanking 8th Cut after the burr embossing 8.1 ramps 9 Elongated section of 8 10 Ends of 10 11, 12 Tab-like approach 13 Lower part of 1 14 Top of 1 15 guide rails 16 Flat level part of 6 17 Closed receiving opening in 6 18 fixing 19 Open receiving opening in 6 20 Guide plate with ring points 21 die 22 cutting punch 23 ejector 24 Inner die 25 ejector 26 Hydraulic system of 3 27 Waste trash (from the re-cut) 28 Embossing stamp of 4 30 upper block 31 Upper auxiliary hydraulics of 4 32 printing plate 33 Cover plate of 4 34 feathers 35 Ejector of 4 36 Interior shape Präger 37 sub-block 38 Lower auxiliary hydraulics of 4 39 Prägeambos 40 lower inner mold embossing 41 Holding stamp of 42 Scraper of 5 43 Bending stamp of 5 44 Pressing plate of 5 45 Springing bearings from 44, 45 46 Counter bearing of 5 47 Bending jaws of 5 48 Ejector of 5 49 Lower auxiliary hydraulics of 5 50 Longitudinal axis of 8 A Pivot axis of 48 B Bending bakery plane in 5 BE Prägeambosebene GE Spring axis of 43 FA Spring axle of 44 FB Matrizenebene ME Disengaged position of 6 PA Feed direction of 7 VR

Claims (16)

  1. Method for producing bent parts, in which method an integral blank (8) in a fine-blanking stage (3) comprising at least one guide plate (21), a die (22), a cutting ram (23), and an ejector (24) is cut from a strip (7) that is clamped between an upper part and a lower part (14, 15) of a tool, the blank (8) in a forming stage (5) is subsequently cold-bent to the predefined shape thereof, and the finished part is discharged from said forming stage (5), wherein the fine-blanking stage (3) is driven by a hydraulic system (27), characterized in that the blank (8) following a complete encircling cut in the fine-blanking stage (3) is fed to an embossing stage (4) in order for the burr to be seamed and is subsequently fed to the forming stage (5), wherein the completely cut out blank (8) remains in the cutting opening of the embossing stage (4) below the die plane (ME) for so long, and the blank (8) after seaming in the embossing stage (4) by way of a force that is additionally generated by a separate drive system (32, 39, 50) is held down in a plane that lies below the die plane (ME) of the fine-blanking stage (3) for so long until a transverse slide (6) has been driven horizontally into the opened tool below the strip (7), the transverse slide (6) that has been driven in then acquires the blank (8) that has been urged back counter to the cutting direction out of the cutting opening into a plane above the die plane (ME), and by way of a further displacement of the transverse slide (6) in the normal direction in relation to the indexing direction (V) of the strip (7) moves said blank (8) in a positionally correct manner into the embossing stage (4), and moves the previously seamed blank (8) in a positionally correct manner into the forming stage (5), and in that the finished bent part (2) after the bending procedure by way of a further additionally generated force is urged out of the forming stage (5) into the transverse slide (6) which moves the bent part (2) in a positionally oriented manner out of the opened tool, wherein the acquisition of the parts in all stages is performed simultaneously by the transverse slide (6).
  2. Method according to Claim 1, characterized by the following operational steps that are performed in a cyclical manner during one operating stroke:
    a) closing the tool and clamping the strip (7) between the upper part and the lower part (14, 15);
    b) cutting out completely at least one blank (8) from the strip (7) in the fine-blanking stage (3);
    c) retaining the blank (8) below the die plane (ME) in the cutting opening of the die (22) of the fine-blanking stage (3), holding down the blank (8) in the embossing stage (4), and lowering the seamed blank (8) in the forming stage (5) below the die plane (ME) by way of separate spring forces that are mutually independent and additionally generated when the tool is opened;
    d) horizontally driving in a transverse slide that in relation to the indexing direction (VR) of the strip (7) operates at an angle of 90° between the upper part and the lower part (14, 15) below the strip (7) into a position above the cutting stage and the embossing stage, in order for the respective blanks (8) to be acquired on the die plane (ME);
    e) urging back the blank (8) that in the fine-blanking stage (3) is lying in the cutting opening of the fine-blanking stage (3) into a plane above the die plane (ME) by way of the ejector (24), releasing the seamed blank (8) that is being held down, and raising the blanks (8) in the embossing stage (4) and in the forming stage (5) by separate drive systems (32, 39, 50) that operate in a mutually independent manner;
    f) acquiring the blank (8) by the transverse slide (6), said blank (8) having been urged back into the plane above the die plane (ME) and having been released, and horizontally infeeding the blank (8) into that embossing stage (4) and that forming stage (5) that in each case has been outwardly offset in relation to the fine-blanking stage (3) by a displacement of the transverse slides (6) from the acquisition positon of the fine-blanking stage (3) up to the position of the embossing stage (4), and subsequently from the acquisition position of the embossing stage (4) into the position of the forming sage (5), while simultaneously discharging the finished bent part (2) from the tool by the transverse slide (6);
    g) closing the tool and renewed concurrent fine-blanking, seaming of the burr in the embossing stage (4), and bending of the seamed blank (8) in the forming stage (5).
  3. Method according to either of Claims 1 and 2, characterized in that the forces that are additionally applied to the blanks (8) for holding down or raising in the embossing stage (4) and the forming stage (5) are generated hydraulically and/or mechanically and/or pneumatically.
  4. Method according to either of Claims 1 and 2, characterized in that the blanks (8) after infeeding into the embossing stage (4) are centred by a spring force.
  5. Method according to either of Claims 1 and 2, characterized in that at least two blanks (8) from the strip (7) are processed simultaneously beside one another in respectively separate fine-blanking stages (3), embossing stages (4), and forming stages (5), wherein common transverse slides (6) which in relation to the indexing direction (VR) of the strip (7) operate at 90° in a reciprocating manner are assigned to each fine-blanking stage (3), embossing stage (4), and forming stage (5).
  6. Method according to either of Claims 1 and 2, characterized in that embossing rams (30) having a defined embossing radius are used for seaming the burrs.
  7. Progressive composite tool for producing bent parts, for carrying out the method according to Claim 1, composed of an upper part and a lower part (15, 14), having at least one fine-blanking stage (3) provided for cutting out a blank (8) from a strip (7), said fine-blanking stage (3) containing at least one guiding or pressing plate (21), respectively, one die (22), one cutting ram (23), and one ejector (24); and having a forming stage (3) that is assembled from a bending ram (44), a wiper (43), and counter bearings (47), for bending the blank (8) to a predefined shape; wherein the fine-blanking stage (3) is connected to a hydraulic drive system (27) and the tool in the closed state holds the strip (7) in a clamping manner, and releases the latter in the opened state, characterized in that each fine-blanking stage (3) is assigned an embossing stage (4) that is upstream of the forming stage (5), wherein the embossing stage (4) and the forming stage (5) are connected to an additional drive system (32, 39, 50) for separately impinging the blank (8) with an additional force for temporarily holding down the blank (8) in the embossing stage (4) below a plane of the die plane (ME) and for ejecting the finished bent part (2) from the forming stage (5), and in that the embossing stage (4) and the forming stage (5) in relation to the fine-blanking stage (3) are disposed in a manner normal to the indexing direction of the strip (7) and are coupled by a common transverse slide (6) which in the case of an opened tool is configured so as to be drivable in and out between the upper part and the lower part (15, 14) below the strip (7), in a manner horizontal in the alignment of the die plane (ME) for acquiring and displacing the blanks (8) from the fine-blanking stage (3) to the embossing stage (4) and from the embossing stage (4) to the forming stage (5), and for discharging the finished bent part (2) from the tool.
  8. Progressive composite tool according to Claim 7, characterized in that the transverse slide (6) upon being retracted in relation to the fine-blanking stage (3) and the embossing stage (4) is disposed in such a position that said transverse slide (6) can acquire the completely cut out blank (8) that by the ejector (24) has been urged out of the cutting opening of the die (22) into the die plane (ME), and by way of the horizontal movement of said transverse slide (6) can displace the blank (8) at 90° in relation to the indexing direction (VR) along the die plane (ME) that is disposed below the strip (7) into the embossing stage (4) that in the direction of the displacement movement is disposed so as to be outwardly offset and is assembled from at least an embossing ram (30) and an embossing anvil (40) for seaming the burr on the cutting contour of the blank, and into the forming stage (5) which in relation to the embossing stage (4) is again disposed so as to be outwardly offset in the direction of the displacement movement, wherein said forming stage (5) is connected to a ramp (9) for discharging the finished bent part (2) from the tool in a free-falling manner.
  9. Progressive composite tool according to Claim 7, characterized in that at least two fine-blanking stages (3) are disposed sequentially in the indexing direction (VR) of the strip (7), the embossing stages (4) and forming stages (5) thereof being mutually disposed in the direction normal to the indexing direction (VR) of the strip (7), wherein the transverse slides (6) of these stages are aligned so as to operate in a mutually reciprocating manner.
  10. Progressive composite tool according to Claim 7, characterized in that the embossing stage (3) has at least one upper and one lower drive system (32, 39), and the forming stage has at least one further drive system (50), said drive systems being mutually independent.
  11. Progressive composite tool according to either of Claims 7 and 10, characterized in that the additional drive system (32, 39, 50) is a hydraulic, pneumatic, or mechanical system.
  12. Progressive composite tool according to Claim 7, characterized in that the transverse slide (6) has a planar even shape and is provided with receptacle openings (18, 20) which in each case are adapted to the shape of the blank (8) and of the finished parts.
  13. Progressive composite tool according to Claim 12, characterized in that the receptacle opening (18) is assigned to the fine-blanking stage (3) and to the embossing stage (4) and in terms of the circumference is configured so as to be closed.
  14. Progressive composite tool according to Claim 12, characterized in that the receptacle opening (20) is assigned to the forming stage (5) and at the end side is configured so as to be open.
  15. Progressive composite tool according to one of Claims 7 to 14, characterized in that the receptacle openings (18, 20) of the transverse slide (6) are provided with fixing elements (19) for holding the blank (8, 8.1) in a positionally correct manner.
  16. Progressive composite tool according to Claim 7, characterized in that the embossing ram (30) and the internal shape embossing tool (41) are provided with a defined embossing radius.
EP09015634.0A 2009-12-17 2009-12-17 Method for producing bent elements and tool for same Active EP2335841B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09015634.0A EP2335841B1 (en) 2009-12-17 2009-12-17 Method for producing bent elements and tool for same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09015634.0A EP2335841B1 (en) 2009-12-17 2009-12-17 Method for producing bent elements and tool for same

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EP2335841A1 EP2335841A1 (en) 2011-06-22
EP2335841B1 true EP2335841B1 (en) 2017-08-16

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019008085A1 (en) 2019-11-21 2020-08-06 Daimler Ag Tool for cutting a raw vehicle component

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ES2533390T3 (en) * 2011-07-08 2015-04-09 Cie Automotive, S.A. Machine and stamping procedure of metal parts
DE102011112215A1 (en) * 2011-09-02 2013-03-07 Robert Bosch Gmbh Clamping lever arrangement, method for producing a clamping lever and control device
CN102389924B (en) * 2011-10-10 2014-11-05 扬州广菱电子有限公司 Large-size shallow-drawing stamping part progressive die
CN103920819B (en) * 2014-05-07 2016-08-24 安徽江淮汽车股份有限公司 Progressive die for stamping parts of automobile
DE102018102929B3 (en) 2018-02-09 2019-03-21 Johannes Hülshorst Apparatus and method of manufacturing a metal retaining bracket

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DE4128194C2 (en) * 1991-08-24 1994-05-19 Rohde & Schwarz Device for the automatic production of sheet metal parts
DE10212245A1 (en) 2002-03-19 2003-10-16 Ise Ind Gmbh Gearshift fork for vehicles has fork ridges, fork sides, drag bearing receivers and an operating lever made from a one-piece steel sheet
DE10326870B3 (en) 2003-06-14 2005-02-03 Dieter Kirschdorf Method for producing a gear shift element made of metal
ATE427798T1 (en) * 2006-09-01 2009-04-15 Feintool Ip Ag METHOD AND TOOL FOR PRODUCING THREE-DIMENSIONAL FITTINGS PRODUCED BY FORMING AND FINE BLANKING PROCESSES

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Publication number Priority date Publication date Assignee Title
DE102019008085A1 (en) 2019-11-21 2020-08-06 Daimler Ag Tool for cutting a raw vehicle component

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