EP2036631B1 - Method and device for manufacturing stamping parts with a larger functional area - Google Patents

Method and device for manufacturing stamping parts with a larger functional area Download PDF

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Publication number
EP2036631B1
EP2036631B1 EP07018139A EP07018139A EP2036631B1 EP 2036631 B1 EP2036631 B1 EP 2036631B1 EP 07018139 A EP07018139 A EP 07018139A EP 07018139 A EP07018139 A EP 07018139A EP 2036631 B1 EP2036631 B1 EP 2036631B1
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EP
European Patent Office
Prior art keywords
cutting
ejector
geometry
forming
flat strip
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EP07018139A
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German (de)
French (fr)
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EP2036631A1 (en
Inventor
Andreas Marti
Ulrich Dipl.-Ing. Schlatter
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Feintool Intellectual Property AG
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Feintool Intellectual Property AG
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Priority to AT07018139T priority Critical patent/ATE489181T1/en
Priority to DE502007005770T priority patent/DE502007005770D1/en
Priority to EP07018139A priority patent/EP2036631B1/en
Priority to MX2008011613A priority patent/MX2008011613A/en
Priority to CA2639455A priority patent/CA2639455C/en
Priority to KR20080090304A priority patent/KR101488019B1/en
Priority to JP2008234889A priority patent/JP2009066662A/en
Priority to US12/283,705 priority patent/US9027379B2/en
Priority to CN2008102135830A priority patent/CN101386045B/en
Publication of EP2036631A1 publication Critical patent/EP2036631A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/16—Shoulder or burr prevention, e.g. fine-blanking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor

Definitions

  • the invention relates to a method for producing a stamped part with enlargedêtsa Structure by means of fine cutting a workpiece from a tape strip, wherein the tape strip between one of a cutting punch, a guide plate for the cutting punch, arranged on the guide plate ring teeth and a Ausstosser upper part and a Cutting plate and ejector existing lower part clamped when closing and the ring point is pressed into the tape strip.
  • the invention further relates to an apparatus for producing a stamped part with an enlarged functional surface by means of fine cutting a workpiece from a strip of tape, with a two-part tool, the Atesten a cutting punch, a guide plate for the cutting punch, arranged on the guide plate ring prong, a Ausstosser, a cutting plate and an ejector, wherein in use the tape strip between the guide plate and cutting plate is clamped and the ring prong is pressed into the tape strip.
  • Typical features of fine cut parts are the edge indent and the cutting edge.
  • the feeder which increases with decreasing the corner radius and increasing sheet thickness.
  • the insertion depth can be approx. 30% and the feed width is about 40% of the sheet thickness or more (see DIN 3345, fineblanking, Aug. 1980).
  • the feeder is thus dependent on material thickness and quality, so that its control is limited and often a limitation of the part function, For example, by a lack of sharp edges of the corners in teeth or by the induced change in the functional length of the parts, brings with it.
  • the punch pull therefore reduces the parting function and forces the manufacturer to use a thicker stock.
  • the workpiece is machined in a single-stage arrangement in at least two successive successive successive step sequences in different cutting directions, in a first cutting operation in the vertical direction cut a tailored to the workpiece geometry semi-finished product with a small indentation and cut in at least one other cutting operation in the opposite direction the part becomes.
  • the collection of the first part of the step is to be replenished at least in the corner.
  • predominantly the projecting punching burr is avoided.
  • the feeder is ultimately not eliminated and material volume is displaced along the cutting line, which is accompanied by an increased risk of cracking.
  • the present invention seeks to avoid the Kanteneinzugs targeted by generating a volume corresponding intake within the part geometry while maintaining the functional surfaces of thinner fine cutting parts while saving material, without the material is moved along the cutting line ,
  • the solution according to the invention is characterized in that it is possible for the first time to economically apply the fine blanking process to parts, for example toothed parts of medium and greater thickness with sharp edges without post-processing and material displacement along the cutting line.
  • the process parameters for the deformation are determined by a virtual forming simulation depending on the material type, shape and geometry of the workpiece. This leads to a fast practical design of the preform elements, in particular the determination of the preform angles on the preform elements.
  • the process parameters for the deformation can be iteratively determined by measuring on actually produced fine-cut parts, without departing from the invention.
  • the method according to the invention can be used variably.
  • the deformation can be carried out in a separate preliminary stage within a tool as a follow-up cut.
  • the complete section by the method according to the invention is particularly advantageous for thinner parts applicable.
  • the inventive method thus covers the fine blanking of parts in a wide dimensional range, for example, parts up to average thicknesses and smaller to medium Dimensions in the complete section and parts up to large thicknesses and dimensions in the subsequent cut, from.
  • the device according to the invention has a simple and robust construction.
  • at least the ejector which counteracts the cutting direction and is assigned to the cutting stage, is provided for the negative deformation of a material volume adapted to the expected edge feed on the feed side, wherein the ejector has on its active side a preform angle between 20 ° and 40 ° corresponding to the geometry of the expected edge feed plus an addition is adapted, wherein the ejector is adapted to support the preformed portion during cutting.
  • Fig. 1 a schematic representation of a device with a separate precursor for preforming the feed geometry with clamped between the upper and lower part tape strip in the closed tool
  • Fig. 2 a simplified schematic representation of the device according to Fig. 1 on the cut tape strip in the closed tool
  • Fig. 3 an enlarged view of the stamping die with preforming angle
  • Fig. 4a and 4b a schematic representation of the geometry of the Kanteneinzugs a according to the prior art and after the deformation according to the invention
  • Fig. 5 a schematic representation of the vote between die and the preformed portion of the tape strip
  • Fig. 6 an example of a produced by the process according to the invention gear part with and without deformation.
  • the Fig. 1 shows the basic structure of a device comprising an upper part 1 and a lower part 2.
  • the upper part 1 includes a Ring sprocket 3 having guide plate 4, a cutting punch 5, which is guided in the guide plate 4, and a Ausstosser 6.
  • the lower part 3 is formed of a cutting plate 7 and an ejector 9.
  • the strip strip 10 of alloyed stainless steel with a thickness of 4, 5 mm, from the method according to the invention, a gear part 11 with teeth 12 to be manufactured is clamped according to the shown positional condition of the tool between the guide plate 4 and cutting plate 7 and the ring teeth 3 has already penetrated into the tape strip 10, whereby the material due the acting ring-tooth force is prevented from re-flowing during cutting.
  • the precursor is formed by a guided in the lower part 2 as a preforming element V embossing die 13, which has on its active side 14 previously determined by a virtual forming simulation preforming angle ⁇ and is provided with a contour 15, the geometry of the expected collection with an empirical values resulting addition corresponds.
  • the deforming of the clamped between upper and part 1 and 2 tape strip is carried out by the stamper 13, the effective direction runs counter to the cutting direction SR of the cutting punch 5.
  • the punch 13 deforms during its advancing movement the tape strip 10 so far that moves the contour 15 of the active side 14 of the die with its preforming angle a in the material of the tape strip by a matched to the geometry of the feeder amount and a deformation of the tape strip 10 on the feed side which corresponds to the volume of the expected intake.
  • Fig. 3 shows an example of a stamping die 13 with a corresponding contour 15 on its active side. It can be seen that this contour corresponds exactly to the geometry of the feeder.
  • the process parameters for the deformation for example the geometry, i. the pull-in height and pull-in width, and the material volume, i. Feeding volume is determined by a virtual forming simulation, depending on the material type, shape and geometry of the workpiece, in which the flow of material in the forming process is shown, strains and reference stresses are analyzed to determine if the deformation can be made and the loads borne by the tool elements.
  • the process parameters for the deformation can also be determined on the real fineblanking part by individual measurement of the pull-in height, pull-in width and determination of the feed volume. This requires a series of tests and their evaluation in order to be able to interpret the embossing die 13 accordingly on this basis.
  • the ejector 9 is used according to the invention as a preforming element for deforming the clamped tape strip in accordance with the expected geometry of the edge indentation.
  • FIG. 4a shows the forming indentation on a fine blank, which made without application of the invention has been.
  • this entry E is defined by the edge retraction height h and edge retraction width b and the resulting burr by cutting burr height and cutting burr width. It is certain that the burr volume is many times smaller than the catch volume V. So to speak, volume has been lost. On the one hand, this volume migrates significantly behind the outer contour of the part and, on the other hand, a small amount is lost due to the solidification of the material.
  • the dimensions and the volume V of the expected edge indentation are determined. This can be done as described in section [0028] either by a forming simulation or by a direct measurement on the real part.
  • Fig. 4b schematically illustrates that the thus determined edge retraction E is imaged in the opposite direction in mirrored form on the feed side. This is done by a corresponding preforming with the embossing punch 13, which is provided with an adapted to the geometric conditions of the expected edge retraction E contour 15 with preforming angle ⁇ . From the Fig. 5 is the particularly good match between the Contour 15 on the die 13 and the preformed portion of the tape strip 10 can be seen.
  • Fig. 6 shows the example of a manufactured by the process according to the invention gear 11, in which a measured at the tooth tip reduction of the insertion depth was achieved by 36%.

Abstract

The method involves performing a negative pre-forming process using a preform element i.e. ejector (9), of a fine blanking tool, before beginning a cutting process at clamped and untreated strips (10) with respect to a cutting direction (SR), where the pre-forming process corresponds to a machining tolerance, and size and geometry of an estimated edge entry during a cutting process in a cutting plate (7). Material volume in a mirrored form is produced on an entry side. The strips are supported by the preform element at start of and during cutting of a precast area. An independent claim is also included for a device for manufacturing a stamping part with an increased functional surface.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Stanzteiles mit vergrößerter Funktionafläche mittels Feinschneidens eines Werkstücks aus einem Bandstreifen, bei dem der Bandstreifen zwischen einem aus einem Schneidstempel, einer Führungsplatte für den Schneidstempel, einer an der Führungsplatte angeordneten Ringzacke und einem Ausstosser zusammengesetzten Oberteil und einem aus Schneidplatte und Auswerfer bestehenden Unterteil beim Schließen eingespannt und die Ringzacke in den Bandstreifen eingedrückt wird.The invention relates to a method for producing a stamped part with enlarged Funktionsafläche by means of fine cutting a workpiece from a tape strip, wherein the tape strip between one of a cutting punch, a guide plate for the cutting punch, arranged on the guide plate ring teeth and a Ausstosser upper part and a Cutting plate and ejector existing lower part clamped when closing and the ring point is pressed into the tape strip.

Die Erfindung betrifft weiterhin eine Vorrichtung zum Herstellen eines Stanzteiles mit vergrößerter Funktionsfläche mittels Feinschneidens eines Werkstücks aus einem Bandstreifen, mit einem zweiteiligen Werkzeug, das midestens einen Schneidstempel, eine Führungsplatte für den Schneidstempel, eine an der Führungsplatte angeordnete Ringzacke, einen Ausstosser, eine Schneidplatte und einen Auswerfer umfasst, wobei im Gebrauch der Bandstreifen zwischen Führungsplatte und Schneidplatte eingespannt ist und die Ringzacke in den Bandstreifen eingedrückt ist.The invention further relates to an apparatus for producing a stamped part with an enlarged functional surface by means of fine cutting a workpiece from a strip of tape, with a two-part tool, the Atesten a cutting punch, a guide plate for the cutting punch, arranged on the guide plate ring prong, a Ausstosser, a cutting plate and an ejector, wherein in use the tape strip between the guide plate and cutting plate is clamped and the ring prong is pressed into the tape strip.

Stand der TechnikState of the art

In der Feinschneid- und Umformtechnik werden vorwiegend Stähle verarbeitet. Dabei erstreckt sich die Vielfalt verwendeter Werkstoffe von einfachen Baustählen bis hin zu hochfesten Feinkornstählen. Die Ressource "Werkstoff" hat in den letzten Jahren stark an Bedeutung gewonnen. Mit einer optimalen Werkstoffausnutzung lassen sich die Herstellkosten eines Bauteiles wesentlich beeinflussen. Die hochfesten Stähle ermöglichen dünnwandigere Bauteile bei gleichem Festigkeitsverhalten.
In den meisten Fällen wirkt die Schnittfläche beim Feinschneiden als Funktionsfläche, weshalb der Einzug einen Kostenfaktor darstellt.In fineblanking and forming technology, mainly steels are processed. The variety of materials used extends from simple structural steels to high-strength fine-grained steels. The resource "material" has gained in importance in recent years. With optimal material utilization, the production costs of a component can be significantly influenced. The high-strength steels enable thinner-walled components with the same strength behavior.
In most cases, the cut surface acts as a functional surface during fineblanking, which is why the feeder is a cost factor.

Typische Merkmale von Feinschnittteilen sind der Kanteneinzug und der Schnittgrat. Insbesondere in Eckenpartien stellt sich der Einzug ein, der mit kleiner werdendem Eckenradius und steigender Blechdicke zunimmt. Die Einzugstiefe kann rd. 30% und die Einzugsbreite etwa 40% der Blechdicke oder mehr betragen (siehe DIN 3345, Feinschneiden, Aug. 1980). Der Einzug ist damit abhängig von Materialdicke und -qualität, so dass seine Steuerung nur begrenzt möglich ist und oft eine Einschränkung der Teilefunktion, beispielsweise durch eine fehlende Scharfkantigkeit der Ecken bei Verzahnungsteilen oder durch die hervorgerufene Änderung der Funktionslänge der Teile, mit sich bringt.
Der Stanzeinzug reduziert deshalb die Teilefunktion, und zwingt den Hersteller zur Verwendung eines dickeren Ausgangsmaterials.Typical features of fine cut parts are the edge indent and the cutting edge. In particular, in corner parts, the feeder, which increases with decreasing the corner radius and increasing sheet thickness. The insertion depth can be approx. 30% and the feed width is about 40% of the sheet thickness or more (see DIN 3345, fineblanking, Aug. 1980). The feeder is thus dependent on material thickness and quality, so that its control is limited and often a limitation of the part function, For example, by a lack of sharp edges of the corners in teeth or by the induced change in the functional length of the parts, brings with it.
The punch pull therefore reduces the parting function and forces the manufacturer to use a thicker stock.

Es sind eine ganze Reihe von Lösungen bekannt, die versuchen, den Kanteneinzug entweder durch Nachschneiden ( CH 665 367 A5 ), Nachschaben ( DE 197 38 636 A1 ) oder Verschieben von Material während des Schneidens ( EP 1 815 922 A1 ) zu beseitigen.
Die bekannten Lösungen nach CH 665 367 A5 und DE 197 38 636 A1 reduzieren nicht den Kanteneinzug, sondern bearbeiten die Teile aufwändig nach, so dass einerseits erhebliche Kosten für zusätzliche Bearbeitungsvorgänge und Werkzeuge erforderlich sind, und andererseits entsprechender Materialverlust durch die Notwendigkeit des dickeren Materialeinsatzes eintritt.
Bei der bekannten Lösung gemäß EP 1 815 922 A1 wird das Werkstück in einer einstufigen Anordnung in mindestens zwei zeitlich aufeinander abfolgenden Schrittfolgen in unterschiedlichen Schnittrichtungen bearbeitet, wobei in einem ersten Schneidvorgang in vertikaler Arbeitsrichtung ein auf die Werkstückgeometrie abgestimmtes Halbfertigfabrikat mit einem geringen Einzug ausgeschnitten und in mindestens einem weiteren Schneidvorgang in entgegengesetzter Arbeitsrichtung das Teil fertiggeschnitten wird. Der Einzug des ersten Teilschritts soll dabei zumindest im Eckbereich wieder aufgefüllt werden. Mit diesem bekannten Verfahren wird vorwiegend jedoch der vorstehende Stanzgrat vermieden.
Auch bei dieser bekannten Lösung wird der Einzug letztendlich nicht beseitigt und Materialvolumen entlang der Schnittlinie verschoben, was mit einem erhöhten Risiko einer Rissbildung einhergeht.There is a whole series of solutions known which try to cut the edges either by trimming ( CH 665 367 A5 ), Scraping ( DE 197 38 636 A1 ) or moving material during cutting ( EP 1 815 922 A1 ) to eliminate.
The known solutions CH 665 367 A5 and DE 197 38 636 A1 Do not reduce the edge feed, but edit the parts consuming, so on the one hand considerable costs for additional machining operations and tools are required, and on the other hand corresponding material loss due to the need for thicker material use occurs.
In the known solution according to EP 1 815 922 A1 the workpiece is machined in a single-stage arrangement in at least two successive successive step sequences in different cutting directions, in a first cutting operation in the vertical direction cut a tailored to the workpiece geometry semi-finished product with a small indentation and cut in at least one other cutting operation in the opposite direction the part becomes. The collection of the first part of the step is to be replenished at least in the corner. With this known method, however, predominantly the projecting punching burr is avoided.
Also in this known solution, the feeder is ultimately not eliminated and material volume is displaced along the cutting line, which is accompanied by an increased risk of cracking.

Aufgabenstellungtask

Bei diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, den Kanteneinzug gezielt durch Erzeugen eines dem Volumen entsprechenden Einzugs innerhalb der Teilegeometrie bei gleichzeitiger Beibehaltung der Funktionsflächen an dünneren Feinschneidteilen unter Einsparung von Material weitgehend zu vermeiden, ohne dass das Material entlang der Schnittlinie bewegt wird.In this prior art, the present invention seeks to avoid the Kanteneinzugs targeted by generating a volume corresponding intake within the part geometry while maintaining the functional surfaces of thinner fine cutting parts while saving material, without the material is moved along the cutting line ,

Diese Aufgabe wird durch ein Verfahren der eingangs genannten Gattung mit den kennzeichnenden Merkmalen des Anspruchs 1 und durch eine Vorrichtung mit den Merkmalen des Anspruchs 9 gelöst.This object is achieved by a method of the type mentioned with the characterizing features of claim 1 and by a device having the features of claim 9.

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

Die erfindungsgemäße Lösung zeichnet sich dadurch aus, dass es erstmals möglich wird, das Feinschneidverfahren auf Teile, beispielsweise Verzahnungsteile mittlerer und größerer Dicke mit scharfen Kanten ohne Nachbearbeitung und Materialverschiebung entlang der Schnittlinie wirtschaftlich anzuwenden.The solution according to the invention is characterized in that it is possible for the first time to economically apply the fine blanking process to parts, for example toothed parts of medium and greater thickness with sharp edges without post-processing and material displacement along the cutting line.

Dies wird dadurch erreicht, dass vor Beginn des Schnitts am eingespannten unbehandelten Bandstreifen entgegen der Schneidrichtung mit einem Vorformelement eine zur Schnittrichtung negative Verformung durchgeführt wird, die dem erwarteten Kanteneinzug beim Schneiden in die Schneidplatte in Größe und Geometrie zuzüglich einer Zugabe entspricht und ein Materialvolumen in gespiegelter Form an der Einzugsseite erzeugt. Mit Beginn und während des Schnitts wird der so vorgeformte Bereich des eingespannten Bandstreifens durch das Vorformelement abgestützt.This is achieved by counteracting the clamped, untreated strip of tape prior to commencing the cut the cutting direction is performed with a preforming element negative deformation to the cutting direction, which corresponds to the expected Kanteneinzug when cutting into the insert in size and geometry plus an addition and generates a volume of material in a mirrored form on the feed side. At the beginning and during the cut, the thus preformed area of the clamped tape strip is supported by the preform element.

Von besonderem Vorteil ist, dass die Prozessparameter für die Verformung, beispielsweise die Geometrie und das Werkstoffvolumen des vorzuformenden Bereichs, in Abhängigkeit von Materialart, Form und Geometrie des Werkstücks durch eine virtuelle Umformsimulation bestimmt werden. Dies führt zu einer schnellen praxisnahen Auslegung der Vorformelemente, insbesondere der Bestimmung der Vorformwinkel an den Vorformelementen.
Die Prozessparameter für die Verformung lassen sich aber durch Vermessen an real hergestellten Feinschnittteilen iterativ bestimmen, ohne die Erfindung zu verlassen.It is particularly advantageous that the process parameters for the deformation, for example the geometry and the material volume of the region to be preformed, are determined by a virtual forming simulation depending on the material type, shape and geometry of the workpiece. This leads to a fast practical design of the preform elements, in particular the determination of the preform angles on the preform elements.
However, the process parameters for the deformation can be iteratively determined by measuring on actually produced fine-cut parts, without departing from the invention.

Das erfindungsgemäße Verfahren ist variabel einsetzbar. So kann die Verformung in einer separaten Vorstufe innerhalb eines Werkzeugs als Folgeschnitt durchgeführt werden. Es ist aber auch im Komplettschnitt unproblematisch ausführbar, wenn der Auswerfer zugleich als Vorformelement verwendet wird, wobei der Komplettschnitt nach dem erfindungsgemäßen Verfahren besonders vorteilhaft für dünnere Teile anwendbar ist.
Das erfindungsgemäße Verfahren deckt somit das Feinschneiden von Teilen in einem breiten Abmessungsbereich, beispielsweise Teile bis zu mittleren Dicken und kleinere bis mittlere Abmessungen im Komplettschnitt und Teile bis zu großen Dicken und Abmessungen im Folgeschnitt, ab.The method according to the invention can be used variably. Thus, the deformation can be carried out in a separate preliminary stage within a tool as a follow-up cut. However, it is also feasible without problems in the complete section, if the ejector is also used as a preform element, the complete section by the method according to the invention is particularly advantageous for thinner parts applicable.
The inventive method thus covers the fine blanking of parts in a wide dimensional range, for example, parts up to average thicknesses and smaller to medium Dimensions in the complete section and parts up to large thicknesses and dimensions in the subsequent cut, from.

Die erfindungsgemäße Vorrichtung hat einen einfachen und robusten Aufbau.
Für den Komplettschnitt ist mindestens der entgegen der Schneidrichtung wirkende, der Schneidstufe zugeordnete Auswerfer zum negativen Verformen eines an den erwarteten Kanteneinzug angepassten Materialvolumens an der Einzugsseite vorgesehen, wobei der Auswerfer an seiner Aktivseite einen Vorformwinkel zwischen 20° und 40° aufweist, der der Geometrie des erwarteten Kanteneinzugs zuzüglich einer Zugabe angepasst ist, wobei der Auswerfer dazu geeignet ist, den vorgeformten Bereich beim Schneiden abzustützen.The device according to the invention has a simple and robust construction.
For the complete cut, at least the ejector, which counteracts the cutting direction and is assigned to the cutting stage, is provided for the negative deformation of a material volume adapted to the expected edge feed on the feed side, wherein the ejector has on its active side a preform angle between 20 ° and 40 ° corresponding to the geometry of the expected edge feed plus an addition is adapted, wherein the ejector is adapted to support the preformed portion during cutting.

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.
Es zeigtThe invention will be explained in more detail below using an exemplary embodiment.
It shows

Fig. 1 eine schematische Darstellung einer Vorrichtung mit einer separaten Vorstufe zum Vorformen der Einzugsgeometrie bei zwischen Ober- und Unterteil geklemmtem Bandstreifen im geschlossenen Werkzeug, Fig. 1 a schematic representation of a device with a separate precursor for preforming the feed geometry with clamped between the upper and lower part tape strip in the closed tool,

Fig. 2 eine vereinfachte schematische Darstellung der Vorrichtung nach Fig. 1 am durchgeschnittenen Bandstreifen im geschlossenen Werkzeug, Fig. 2 a simplified schematic representation of the device according to Fig. 1 on the cut tape strip in the closed tool,

Fig. 3 eine vergrößerte Darstellung des Prägestempels mit Vorformwinkel, Fig. 3 an enlarged view of the stamping die with preforming angle,

Fig. 4a und 4b eine schematische Darstellung der Geometrie des Kanteneinzugs eines nach dem Stand der Technik und nach dem erfindungsgemäßen Verformen, Fig. 4a and 4b a schematic representation of the geometry of the Kanteneinzugs a according to the prior art and after the deformation according to the invention,

Fig. 5 eine schematische Darstellung der Abstimmung zwischen Prägestempel und dem vorgeformten Bereich des Bandstreifens und Fig. 5 a schematic representation of the vote between die and the preformed portion of the tape strip and

Fig. 6 ein Beispiel eines nach dem erfindungsgemäßen Verfahren herstellten Getriebeteils mit und ohne Verformung. Fig. 6 an example of a produced by the process according to the invention gear part with and without deformation.

Die Fig. 1 zeigt den grundsätzlichen Aufbau einer Vorrichtung, die ein Oberteil 1 und ein Unterteil 2 umfasst. Zum Oberteil 1 gehört eine eine Ringzacke 3 aufweisende Führungsplatte 4, ein Schneidstempel 5, der in der Führungsplatte 4 geführt ist, und ein Ausstosser 6. Das Unterteil 3 ist gebildet aus einer Schneidplatte 7 und einem Auswerfer 9. Der Bandstreifen 10 aus legiertem rostfreien Stahl mit einer Dicke von 4,5 mm, aus dem nach dem erfindungsgemäßen Verfahren ein Getriebeteil 11 mit Verzahnung 12, gefertigt werden soll, ist nach dem gezeigten Stellungszustand des Werkzeugs zwischen Führungsplatte 4 und Schneidplatte 7 eingeklemmt und die Ringzacke 3 ist bereits in den Bandstreifen 10 eingedrungen, wodurch der Werkstoff infolge der einwirkenden Ringzackenkraft am Nachfließen während des Schneidens gehindert wird.The Fig. 1 shows the basic structure of a device comprising an upper part 1 and a lower part 2. The upper part 1 includes a Ring sprocket 3 having guide plate 4, a cutting punch 5, which is guided in the guide plate 4, and a Ausstosser 6. The lower part 3 is formed of a cutting plate 7 and an ejector 9. The strip strip 10 of alloyed stainless steel with a thickness of 4, 5 mm, from the method according to the invention, a gear part 11 with teeth 12 to be manufactured is clamped according to the shown positional condition of the tool between the guide plate 4 and cutting plate 7 and the ring teeth 3 has already penetrated into the tape strip 10, whereby the material due the acting ring-tooth force is prevented from re-flowing during cutting.

Die Vorstufe wird gebildet durch einen im Unterteil 2 geführten als Vorformelement V ausgebildeten Prägestempel 13, der auf seiner Aktivseite 14 einen zuvor durch eine virtuelle Umformsimulation bestimmten Vorformwinkel α aufweist und mit einer Kontur 15 versehen ist, die der Geometrie des erwarteten Einzugs mit einer aus Erfahrungswerten resultierenden Zugabe entspricht. Das Verformen des zwischen Ober- und Teil 1 bzw. 2 eingeklemmten Bandstreifens erfolgt durch den Prägestempel 13, dessen Wirkrichtung entgegen der Schneidrichtung SR des Schneidstempels 5 verläuft. Der Prägestempel 13 verformt bei seiner Vorschubbewegung den Bandstreifen 10 soweit, dass sich die Kontur 15 der Aktivseite 14 des Prägestempels mit seinem Vorformwinkel a in das Material des Bandstreifens um einen an die Geometrie des Einzugs angepassten Betrag hineinbewegt und eine Verformung des Bandstreifens 10 auf der Einzugsseite bewirkt, die dem Volumen des erwarteten Einzugs entspricht.
Fig. 3 zeigt ein Beispiel eines Prägestempels 13 mit einer entsprechenden Kontur 15 an seiner Aktivseite. Es ist zu erkennen, dass diese Kontur der Geometrie des Einzugs genau entspricht.The precursor is formed by a guided in the lower part 2 as a preforming element V embossing die 13, which has on its active side 14 previously determined by a virtual forming simulation preforming angle α and is provided with a contour 15, the geometry of the expected collection with an empirical values resulting addition corresponds. The deforming of the clamped between upper and part 1 and 2 tape strip is carried out by the stamper 13, the effective direction runs counter to the cutting direction SR of the cutting punch 5. The punch 13 deforms during its advancing movement the tape strip 10 so far that moves the contour 15 of the active side 14 of the die with its preforming angle a in the material of the tape strip by a matched to the geometry of the feeder amount and a deformation of the tape strip 10 on the feed side which corresponds to the volume of the expected intake.
Fig. 3 shows an example of a stamping die 13 with a corresponding contour 15 on its active side. It can be seen that this contour corresponds exactly to the geometry of the feeder.

Die Prozessparameter für das Verformen, beispielsweise die Geometrie, d.h. die Einzugshöhe und Einzugsbreite, und das Werkstoffvolumen, d.h. Einzugsvolumen, wird in Abhängigkeit von Materialart, Form und Geometrie des Werkstücks durch eine virtuelle Umformsimulation bestimmt, in der der Werkstofffluss im Umformprozess dargestellt, Dehnungen und Vergleichsspannungen analysiert werden, um festzustellen, ob die Formänderung machbar und die Belastungen durch die Werkzeugelemente getragen werden können. Die Prozessparameter für das Verformen können aber auch am realen Feinschneidteil durch individuelle Vermessung der Einzugshöhe, Einzugsbreite und Bestimmung des Einzugsvolumens ermittelt werden. Dazu bedarf es eine Reihe von Versuchen und deren Auswertung, um auf dieser Grundlage den Prägestempel 13 entsprechend auslegen zu können.The process parameters for the deformation, for example the geometry, i. the pull-in height and pull-in width, and the material volume, i. Feeding volume is determined by a virtual forming simulation, depending on the material type, shape and geometry of the workpiece, in which the flow of material in the forming process is shown, strains and reference stresses are analyzed to determine if the deformation can be made and the loads borne by the tool elements. However, the process parameters for the deformation can also be determined on the real fineblanking part by individual measurement of the pull-in height, pull-in width and determination of the feed volume. This requires a series of tests and their evaluation in order to be able to interpret the embossing die 13 accordingly on this basis.

Anstelle der separaten, hier näher beschriebenen Vorstufe, wird erfindungsgemäß der Auswerfer 9 als Vorformelement für das Verformen des eingeklemmten Bandstreifens entsprechend der erwarteten Geometrie des Kanteneinzugs genutzt.Instead of the separate precursor described in more detail here, the ejector 9 is used according to the invention as a preforming element for deforming the clamped tape strip in accordance with the expected geometry of the edge indentation.

Die Zusammenhänge zum Verständnis für das erfindungsgemäße Verfahren sind in den Fig. 4a, 4b, 5 und 6 gezeigt.
Die Fig. 4a zeigt den sich ausbildenden Einzug an einem Feinschneidteil, das ohne Anwendung der Erfindung gefertigt wurde. Dieser Einzug E ist nach DIN 6930 und VDI-Richtlinie 2906 durch die Kanteneinzugshöhe h und Kanteneinzugsbreite b und der sich einstellende Grat durch Schnittgrathöhe und Schnittgratbreite definiert. Es ist gesicherte Erkenntnis, dass das Gratvolumen um ein Vielfaches gegenüber dem Einzugsvolumen V kleiner ist. Gewissermaßen ist also Volumen verloren gegangen. Dieses Volumen wandert einerseits deutlich hinter die Aussenkontur des Teils und andererseits geht ein geringer Betrag aufgrund der Verfestigung des Materials verloren.
Beim Scherschneiden werden Zugkräfte in das Material eingebracht, welche letztendlich grösser werden als die zusammenhaltenden Kräfte im Atomgitter. Dies führt zu einem Abgleiten zwischen den benachbarten Ebenen von Schneidstempel 5 und Schneidplatte 7. Vor dem eigentlichen Scheren finden jedoch plastische Verformungen statt, die zum Kanteneinzug E führen.The relationships to the understanding of the inventive method are in the Fig. 4a . 4b . 5 and 6 shown.
The Fig. 4a shows the forming indentation on a fine blank, which made without application of the invention has been. According to DIN 6930 and VDI guideline 2906, this entry E is defined by the edge retraction height h and edge retraction width b and the resulting burr by cutting burr height and cutting burr width. It is certain that the burr volume is many times smaller than the catch volume V. So to speak, volume has been lost. On the one hand, this volume migrates significantly behind the outer contour of the part and, on the other hand, a small amount is lost due to the solidification of the material.
When shear cutting tensile forces are introduced into the material, which are ultimately greater than the cohesive forces in the atomic lattice. This leads to slipping between the adjacent levels of cutting punch 5 and cutting plate 7. However, before the actual shearing plastic deformations take place, leading to the edge feed E.

Für jede Geometrie eines nach dem erfindungsgemäßen Verfahren herzustellenden Teils werden die Abmessungen und das Volumen V des zu erwartenden Kanteneinzugs bestimmt. Dies kann wie im Abschnitt [0028] beschrieben entweder durch eine Umformsimulation oder durch eine direkte Vermessung am realen Teil geschehen.
In Fig. 4b ist schematisch verdeutlicht, dass der so bestimmte Kanteneinzug E in der Gegenrichtung in gespiegelter Form an der Einzugsseite abgebildet wird. Dies erfolgt durch ein entsprechendes Vorformen mit dem Prägestempel 13, der mit einer an die geometrischen Verhältnisse des erwarteten Kanteneinzugs E angepassten Kontur 15 mit Vorformwinkel α versehen ist.
Aus der Fig. 5 ist die besonders gute Abstimmung zwischen der Kontur 15 am Prägestempel 13 und der vorgeformten Partie des Bandstreifens 10 ersichtlich. Während auf der Auswerferseite die vorgeformte Partie durch die Kontur 15 am Prägestempel 13 gestützt wird, entsteht auf der Führungsseite ein Hohlraum, da der Schneidstempel 5 um die Einzugshöhe h zurücksteht. Die Folge dieser Abstimmung ist ein Hohlraum H, der jedoch auf Grund des deutlich gegenüber dem Volumen des Einzugs geringeren Volumens des Grats nicht komplett aufgefüllt werden kann. Infolge der seitlichen Begrenzung durch die Schneidplatte 4 wird das Material am Ausweichen gehindert und entsprechend umgeformt, was zu einer zusätzlichen Verfestigung der Einflusszone im Bereich des Einzugs E führt.For each geometry of a part to be produced by the method according to the invention, the dimensions and the volume V of the expected edge indentation are determined. This can be done as described in section [0028] either by a forming simulation or by a direct measurement on the real part.
In Fig. 4b schematically illustrates that the thus determined edge retraction E is imaged in the opposite direction in mirrored form on the feed side. This is done by a corresponding preforming with the embossing punch 13, which is provided with an adapted to the geometric conditions of the expected edge retraction E contour 15 with preforming angle α.
From the Fig. 5 is the particularly good match between the Contour 15 on the die 13 and the preformed portion of the tape strip 10 can be seen. While the preformed part is supported by the contour 15 on the ejection punch 13 on the ejector side, a cavity is created on the guide side, since the cutting punch 5 is set back by the pull-in height h. The result of this vote is a cavity H, which, however, can not be completely filled due to the significantly lower volume of the burr compared to the volume of the collection. As a result of the lateral boundary by the cutting plate 4, the material is prevented from dodging and deformed accordingly, resulting in an additional solidification of the influence zone in the region of the feeder E.

Fig. 6 zeigt das Beispiel eines nach dem erfindungsgemäßen Verfahren gefertigten Getriebeteils 11, bei der eine an der Zahnspitze gemessene Reduktion der Einzugstiefe um 36% erzielt wurde. Fig. 6 shows the example of a manufactured by the process according to the invention gear 11, in which a measured at the tooth tip reduction of the insertion depth was achieved by 36%.

Bezugszeichenliste Oberteil des Feinschneidwerkzeugs 1 Unterteil des Feinschneidwerkzeugs 2 Ringzacke 3 Führungsplatte 4 Schneidstempel 5 Ausstosser 6 Schneidplatte (Matrize) 7 Auswerfer 9 Bandstreifen 10 Getriebeteil 11 Verzahnung 12 Prägestempel/ Auswerfer 13 Aktivseite von 13 14 Kontur von 13 15 Kanteneinzug E Kanteneinzugsbreite b Kanteneinzugshöhe h Hohlraum H Schneidrichtung SR Einzugsvolumen V Vorformwinkel α LIST OF REFERENCE NUMBERS Upper part of fineblanking tool 1 Lower part of the fineblanking tool 2 V-shaped projection 3 guide plate 4 cutting punch 5 ejector 6 Cutting plate (matrix) 7 ejector 9 tape strips 10 transmission part 11 gearing 12 Embossing stamp / ejector 13 Active side of 13 14 Contour of 13 15 edge rollover e Edge rollover width b Edge rollover height H cavity H cutting direction SR feeder volume V preform angle α

Claims (9)

  1. Method for the production of stampings with enlarged functional surface by means of fine blanking a workpiece out of a flat strip, wherein the flat strip at closing is clamped between an upper part consisting of a shearing punch (5), a pressure pad (4) for the shearing punch, an arranged on the pressure pad V-shaped projection (3) and an ejector (6) and a lower part consisting of a cutting die (7), an ejector (9) and an inner form punch and the V-shaped projection is pressed into the flat strip, characterized in that at the untreated clamped flat strip before the cutting starts is realized a negative with regard to the cutting direction forming with a preforming element in the direction opposite to the cutting direction that corresponds to the expected edge rollover into the cutting die with regard to size and geometry at cutting including an allowance and generates a material volume at the side of the rollover in a mirror-inverted form, and that in the beginning and during the cutting the preformed area of the clamped flat strip is supported by the preforming element.
  2. Method according to claim 1, characterized in that the process parameters for the forming in the area to be preformed, for example the geometry and the material volume of the edge rollover, are determined depending on the material type, shape and geometry of the workpiece by a virtual forming simulation.
  3. Method according to claim 1, characterized in that that the process parameters for the forming, for example the geometry and the material volume of the edge rollover, of the area to be preformed, are iteratively determined depending on the material type, shape and geometry of the workpiece by measuring at least two real fine blanking parts.
  4. Method according to claims 1 to 3, characterized in that the forming is carried out in a separate pre-stage or before starting the cutting process in a common stage, the process parameters of which are respectively adjusted according to the determined edge rollover.
  5. Method according to claims 4, characterized in that the forming in the direction to the pressure pad and the cutting in the following step are realized at parts with a thickness of up to 10 mm, advantageously 3 to 5 mm, and small and large dimensions.
  6. Method according to claims 1 and 4, characterized in that as preforming element is used the ejector (9) of the fine blanking tool.
  7. Method according to claims 4 and 6, characterized in that the forming in the direction to the stamp and the cutting in the complex cutting operation are realized at parts with medium thickness, advantageously 3 to 7 mm, and small and medium-sized dimensions.
  8. Method according to claim 1, characterized in that no material is shifted along the cutting line determined by cutting die (7) and shearing punch (5).
  9. Device for the production of a stamping with enlarged functional surface by means of fine blanking a workpiece out of a flat strip, for realizing the method according to claim 1, with a tool having two parts comprising at least a shearing punch (5), a pressure pad (4) for the shearing punch (5), an arranged on the pressure pad V-shaped projection (3), an ejector (6), a cutting die (7) and an ejector (9), wherein the used flat strip is clamped between pressure pad (4) and cutting die (7) and the V-shaped projection is pressed into the flat strip, characterized in that at least one acting against the cutting direction (SR), allocated to the cutting stage ejector (9) is provided for negatively forming a material volume (V) on the rollover side corresponding with the expected edge rollover (E), wherein the ejector (9) at its active side has a preforming angle (α) of 20° to 40°, preferably 30°, which correspond with the geometry of the expected edge rollover plus an allowance, wherein the ejector is suitable to support the preformed area at cutting.
EP07018139A 2007-09-14 2007-09-14 Method and device for manufacturing stamping parts with a larger functional area Active EP2036631B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AT07018139T ATE489181T1 (en) 2007-09-14 2007-09-14 METHOD AND DEVICE FOR PRODUCING STAMPED PARTS WITH ENLARGED FUNCTIONAL AREA
DE502007005770T DE502007005770D1 (en) 2007-09-14 2007-09-14 Method and device for producing stamped parts with an enlarged functional surface
EP07018139A EP2036631B1 (en) 2007-09-14 2007-09-14 Method and device for manufacturing stamping parts with a larger functional area
MX2008011613A MX2008011613A (en) 2007-09-14 2008-09-10 Method and device for manufacturing stamping parts with a larger functional area.
CA2639455A CA2639455C (en) 2007-09-14 2008-09-11 Method and device for the production of a stamping with enlarged functional surface
KR20080090304A KR101488019B1 (en) 2007-09-14 2008-09-12 Method and device for the production of a stamping with enlarged functional surface
JP2008234889A JP2009066662A (en) 2007-09-14 2008-09-12 Method and device for producing punching part with enlarged functional surface
US12/283,705 US9027379B2 (en) 2007-09-14 2008-09-15 Method and device for the production of a stamping with enlarged functional surface
CN2008102135830A CN101386045B (en) 2007-09-14 2008-09-16 Method and device for manufacturing stamping parts with a larger functional area

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Application Number Priority Date Filing Date Title
EP07018139A EP2036631B1 (en) 2007-09-14 2007-09-14 Method and device for manufacturing stamping parts with a larger functional area

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EP2036631A1 EP2036631A1 (en) 2009-03-18
EP2036631B1 true EP2036631B1 (en) 2010-11-24

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EP (1) EP2036631B1 (en)
JP (1) JP2009066662A (en)
KR (1) KR101488019B1 (en)
CN (1) CN101386045B (en)
AT (1) ATE489181T1 (en)
CA (1) CA2639455C (en)
DE (1) DE502007005770D1 (en)
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CN101386045B (en) 2012-11-21
CA2639455C (en) 2015-12-29
DE502007005770D1 (en) 2011-01-05
US20090173129A1 (en) 2009-07-09
CN101386045A (en) 2009-03-18
KR20090028465A (en) 2009-03-18
KR101488019B1 (en) 2015-01-29
JP2009066662A (en) 2009-04-02
US9027379B2 (en) 2015-05-12
EP2036631A1 (en) 2009-03-18
MX2008011613A (en) 2009-04-15
CA2639455A1 (en) 2009-03-14
ATE489181T1 (en) 2010-12-15

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