EP0920932B1 - Method and apparatus for punching a workpiece - Google Patents
Method and apparatus for punching a workpiece Download PDFInfo
- Publication number
- EP0920932B1 EP0920932B1 EP98120235A EP98120235A EP0920932B1 EP 0920932 B1 EP0920932 B1 EP 0920932B1 EP 98120235 A EP98120235 A EP 98120235A EP 98120235 A EP98120235 A EP 98120235A EP 0920932 B1 EP0920932 B1 EP 0920932B1
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- EP
- European Patent Office
- Prior art keywords
- pressure
- punch
- workpiece
- wall
- pressure medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- 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
- B21D28/24—Perforating, i.e. punching holes
- B21D28/28—Perforating, i.e. punching holes in tubes or other hollow bodies
Definitions
- the invention relates to a method and a device according to the preamble of claims 1 and 8, for punching a workpiece, the workpiece being a Hollow body manufactured by the hydroforming process or can be formed as a sheet-shaped part.
- One side of the wall of the workpiece becomes one under High pressure pressure medium and the other side of the Action of a stamp guided in a tool exposed, the stamp against the wall of the High pressure of the pressure medium cuts or a Tool designed circumferential cutting edge releases the wall under the influence of a high pressure is cut. It finds a source to deploy a high pressure pressure medium and one Pressure feeder for feeding the print medium into the High pressure room application.
- A1 a method for manufacturing an opening in the wall of a hollow body trained workpiece and a tool for implementation of the method described, the tool in the area the desired breakthrough with a sharp edge of the component-walled cavity is provided to the wall in the direction of this cavity so under pressure to be able to put them on the sharp edge cuts.
- DE 43 22 063 C1 becomes an internal high pressure forming tool guided stamp initially for the purpose of pre-cutting against the wall under maximum internal pressure and then for the purpose of complete cutting led against the wall under reduced pressure.
- the invention has for its object a method and to provide a device for punching a workpiece, the one with lower media and / or stamp pressure less edge shape deviation, a smaller ridge height and ensures a better cutting surface.
- the workpiece can be used as a hydroforming process manufactured hollow body or as a be sheet-shaped part.
- One side of the wall the workpiece becomes a high pressure one Print medium and its other side under the influence of a exposed to a tool-guided stamp.
- the punch either cuts the wall of the workpiece against the effect of the print medium or the stamp a circumferential cutting edge formed on the tool which affects the wall of the workpiece increasing pressure of the print medium (D) cut, free or both are carried out one after the other.
- the movement of the stamp is in the form of the feed movement when cutting the wall of the workpiece and / or in shape the return stroke movement when releasing the rotating Cutting edge of the tool is overlaid by a vibration and / or the application of the applied to the wall High pressure through the pressure medium (D) occurs in rhythm a vibration. This can puncture the workpiece by the stamp for non-vibrating or vibrating increasing or decreasing high pressure of the pressure medium.
- the frequency of the vibration of the stamp and / or printing medium is preferably on the order of 5 to 50 Hz. However, it is also possible to use one in the ultrasound range to use.
- the vibration amplitudes and / or the frequencies of the Vibrations of the stamp and the printing medium can be the same or be different.
- the device for punching a workpiece on one side of the wall of the workpiece Stamp and on the other side of the wall High pressure room There is also a source to provide a pressurized medium and one Pressure feeder for feeding the print medium into the High pressure room provided.
- Control device provided with the stamp movement and the vibration of the stamp and / or the high pressure of the Print medium and its vibration superposition controllable are.
- the device has a tool 2, between which Upper tool part 4 and lower tool part 6 the workpiece 8 pressure-tight is clamped.
- a stamp 10 is guided by a drive 12 in Direction of the wall of the workpiece 8 (feed movement) and can be moved away from it (return stroke movement).
- the Lower tool part 6 has a pressure chamber 14 which over a pressure feed 16 with a high pressure source 18 in Connection is established.
- the drive 12 and the high pressure source 18 are connected to a control device 20 which it allows the stamp movement and / or the pressure of the To control print medium D in rhythm with an oscillation.
- Fig. 1 issued the control device 20 to the stamp 10 via the Drive 12 one superimposed with an oscillation constant feed in the direction of the wall of the workpiece 8.
- the stamp 10 for each oscillation period larger piece penetrates into the wall 8 than it out of it retracts, it progresses gradually until it contrary to one of the control device 20 via the Pressure source 18 and the channel 16 maintained has completely penetrated constant high pressure and the cutout is made.
- the constant High pressure caused by a swinging or non-swinging or to replace decreasing high pressure.
- the stamp 10 by reversing the constant feed swinging from the wall of the To move workpiece 8.
- the pressure of the Pressure medium D in the pressure chamber 14 may be constant or else oscillating or non-oscillating, for example linear increase. Because the stamp 10 per period of vibration always a larger piece on the tool part 4 revolving cutting edge 22 as he releases it again covered, the wall 8 separates below the higher becoming pressure in the pressure chamber 14 gradually at the Tool 2 circumferential cutting edge 22.
- FIG. 3 is the path-time diagram of a wall 8 swinging cutting stamp 10 shown.
- the control device 20 Under the Influence of the control device 20 is due to the drive 12 realized an oscillation with a frequency of 17 Hz has been superimposed.
- the amplitude of the resulting feed vibration exhibits e.g. one positive proportion of 0.06 mm / s and a negative proportion from 0.04 mm / s.
- the stamp penetrates 10 with low cutting force in the wall of a workpiece and leaves a high quality perforation.
- Ultrasonic vibration provided by ultrasonic transducers achieve, whose frequency is preferably 20 kHz.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Vorrichtung
nach dem Oberbegriff der Ansprüche 1 und 8,
zum Lochen eines Werkstückes, wobei das Werkstück als ein
nach dem Innenhochdruckumformverfahren hergestellter Hohlkörper
oder als blechförmiges Teil ausgebildet sein kann.
Eine Seite der Wandung des Werkstückes wird einem unter
Hochdruck stehenden Druckmedium und die andere Seite der
Einwirkung eines in einem Werkzeug geführten Stempels
ausgesetzt, wobei der Stempel die Wandung entgegen des
Hochdruckes des Druckmediums schneidet oder eine am
Werkzeug ausgebildete umlaufende Schneidkante freigibt, an
der sich die Wand unter dem Einfluß eines Hochdrucks
geschnitten wird. Es findet eine Quelle zum Bereitstellen
eines mit Hochdruck beaufschlagbaren Druckmediums und eine
Druckzuführung zum Zuführen des Druckmediums in den
Hochdruckraum Anwendung.The invention relates to a method and a device
according to the preamble of
Beim Innenhochdruck-Umformverfahren und dem ebenso bekannten hydromechanischen Tiefziehen werden Bauteilwandungen unter Einwirkung eines unter hohem Druck stehenden Druckmediums an die Kontur eines Werkzeuges gedrückt. Um die so erzeugten Bauteile anschließend im gleichen Werkzeug mit Durchbrüchen versehen zu können, sind mehrere Verfahren und Vorrichtungen bekannt. With the hydroforming process and so on Known hydromechanical deep drawing are component walls under the action of one under high pressure standing pressure medium to the contour of a tool pressed. In order to subsequently create the components the same tool can be provided with openings several methods and devices are known.
So wird gem. DE 40 35 625 (Oberbegriff der Ansprüche 1 und 8) A1 ein Verfahren zum Herstellen eines Durchbruches in der Wandung eines als Hohlkörper ausgebildeten Werkstückes und ein Werkzeug zur Durchführung des Verfahrens beschrieben, wobei das Werkzeug im Bereich des gewünschten Durchbruchs mit einem sich scharfkantig von der Bauteilwandung wegweisendem Hohlraum versehen ist, um die Wandung in Richtung dieses Hohlraums derart unter Druck setzen zu können, daß sie sich an der scharfen Kante schneidet. Bei einem weiteren bekannten Verfahren nach DE 43 22 063 C1 wird ein im Innenhochdruck-Umformwerkzeug geführter Stempel zunächst zum Zwecke des Vorschneidens gegen die unter maximalem Innendruck stehende Wand und anschließend zum Zwecke des vollständigen Ausschneidens gegen die unter verringertem Druck stehende Wand geführt.So according to DE 40 35 625 (preamble of claims 1 and 8) A1 a method for manufacturing an opening in the wall of a hollow body trained workpiece and a tool for implementation of the method described, the tool in the area the desired breakthrough with a sharp edge of the component-walled cavity is provided to the wall in the direction of this cavity so under pressure to be able to put them on the sharp edge cuts. In another known method according to DE 43 22 063 C1 becomes an internal high pressure forming tool guided stamp initially for the purpose of pre-cutting against the wall under maximum internal pressure and then for the purpose of complete cutting led against the wall under reduced pressure.
Der abgeschnittene Rest gelangt dabei in den Druckraum, aus dem er durch den erzielten Durchbruch wieder herausgedrückt werden muß. Um dies zu vermeiden, wird gem. DE 195 06 067 C1, mit einem Stempel in der Wandung zunächst eine Sollbruchstelle erzeugt und dann durch den Stempel am Werkzeug eine umlaufende Schneidkante freigegeben, an der sich die Wandung unter dem Einfluß des sich steigernden Innenhochdrucks endgültig auftrennt.The cut off remains in the pressure chamber which he pushed out again through the breakthrough he achieved must become. To avoid this, according to DE 195 06 067 C1, first with a stamp in the wall Predetermined breaking point and then by the stamp on Tool released a circumferential cutting edge on the the wall under the influence of the increasing Final high pressure.
Unabhängig davon, ob das Ausschneiden des Durchbruchs von innen nach außen und/oder von außen nach innen erfolgt, ist allen Verfahren gemeinsam, daß sie eine große Schneidkraft, d. h., hohen Medien- und/oder hohen Stempeldruck erfordern. Weiterhin weisen die erzeugten Schnittkanten eine große Kantenformabweichung und eine große Grathöhe auf.Regardless of whether cutting out the opening of inside out and / or from outside in common to all processes that they have a high cutting force, d. i.e., require high media and / or high stamp pressure. Furthermore, the cut edges generated have a large Edge shape deviation and a large burr height.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zum Lochen eines Werkstückes zu schaffen, die bei geringerem Medien- und/oder Stempeldruck eine geringere Kantenformabweichung, eine kleinere Grathöhe und eine bessere Schnittfläche gewährleistet.The invention has for its object a method and to provide a device for punching a workpiece, the one with lower media and / or stamp pressure less edge shape deviation, a smaller ridge height and ensures a better cutting surface.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des ersten und achten Patentanspruchs. Die Unteransprüche definieren bevorzugte Ausführungen der Erfindund.This object is achieved by the features of first and eighth claims. The Subclaims define preferred embodiments of the invention.
Dabei kann das Werkstück als ein nach dem Innenhochdruckumformverfahren hergestellter Hohlkörper oder als ein blechförmiges Teil ausgebildet sein. Eine Seite der Wandung des Werkstückes wird einem unter Hochdruck stehenden Druckmedium und dessen andere Seite der Einwirkung eines in einem Werkzeug geführten Stempels ausgesetzt. Dabei schneidet der Stempel entweder die Wandung des Werkstückes entgegen der Wirkung des Druckmediums oder der Stempel gibt eine am Werkzeug ausgebildete umlaufende Schneidkante, an der sich die Wandung des Werkstückes unter dem Einfluß zunehmenden Druckes des Druckmediums (D) geschnitten , frei oder es wird beides nacheinander ausführt. Erfindungsgemäß wird die Bewegung des Stempels in Form der Vorschubbewegung beim Schneiden der Wandung des Werkstückes und/oder in Form der Rückhubbewegung beim Freigeben der umlaufenden Schneidkante des Werkzeuges von einer Schwingung überlagert und/oder das Aufbringen des an der Wandung anliegenden Hochdrucks durch das Druckmedium (D) erfolgt im Rhythmus einer Schwingung. Dabei kann das Lochen des Werkstückes durch den Stempel bei nichtschwingendem oder schwingendem zu- oder abnehmendem Hochdruck des Druckmediums erfolgen.The workpiece can be used as a hydroforming process manufactured hollow body or as a be sheet-shaped part. One side of the wall the workpiece becomes a high pressure one Print medium and its other side under the influence of a exposed to a tool-guided stamp. there the punch either cuts the wall of the workpiece against the effect of the print medium or the stamp a circumferential cutting edge formed on the tool which affects the wall of the workpiece increasing pressure of the print medium (D) cut, free or both are carried out one after the other. According to the invention the movement of the stamp is in the form of the feed movement when cutting the wall of the workpiece and / or in shape the return stroke movement when releasing the rotating Cutting edge of the tool is overlaid by a vibration and / or the application of the applied to the wall High pressure through the pressure medium (D) occurs in rhythm a vibration. This can puncture the workpiece by the stamp for non-vibrating or vibrating increasing or decreasing high pressure of the pressure medium.
Weiterhin ist es möglich, daß zuerst unter einer Vorschubbewegung des Stempels das Anschneiden der Wandung des Werkstückes bis auf eine Restwanddicke erfolgt und anschließend unter einer Rückhubbewegung des Stempels die umlaufende Schneidkante durch den Stempel freigegeben wird, so daß der Ausschnitt durch den Hochdruck des Druckmediums bei gleichzeitiger Schwingungsüberlagerung der Stempelbewegung des Stempels und/oder des Druckes des Druckmediums aus der Wandung des Werkstückes ausgeschnitten wird. Dabei kann das Anschneiden der Wandung des Werkstückes bis auf eine Restwanddicke und die Rückhubbewegung des Stempels die zur Freigabe der umlaufende Schneidkante durch den Stempel auch wechselweise im Rhythmus einer Schwingung erfolgen.It is also possible that first under a feed movement of the stamp cutting the wall of the Workpiece to a residual wall thickness and then under a return stroke movement of the stamp circumferential cutting edge is released by the punch, so that the cutout by the high pressure of the pressure medium with simultaneous vibration superimposition of the stamp movement the stamp and / or the pressure of the print medium is cut out of the wall of the workpiece. there can cut the wall of the workpiece down to a remaining wall thickness and the return stroke movement of the stamp to release the circumferential cutting edge by the punch also alternate in the rhythm of a vibration.
Die Frequenz der Schwingung von Stempel und/oder Druckmedium liegt vorzugsweise in der Größenordnung von 5 bis 50 Hz. Es ist jedoch auch möglich eine im Ultraschallbereich zu verwenden.The frequency of the vibration of the stamp and / or printing medium is preferably on the order of 5 to 50 Hz. However, it is also possible to use one in the ultrasound range to use.
Die Schwingungsamplituden und/oder die Frequenzen der Schwingungen von Stempel und Druckmedium können gleich oder unterschiedlich sein.The vibration amplitudes and / or the frequencies of the Vibrations of the stamp and the printing medium can be the same or be different.
Bei der Vorrichtung zum Lochen eines Werkstückes befindet sich auf einer Seite der Wandung des Werkstückes der Stempel und auf der anderen Seite der Wandung ein Hochdruckaum. Weiterhin ist eine Quelle zum Bereitstellen eines mit Hochdruck beaufschlagbaren Druckmediums und einer Druckzuführung zum Zuführen des Druckmediums in den Hochdruckraum vorgesehen. Erfindungsgemäß sind der Druckzylinder zur Erzeugung des Stempelvorschubes und des Stempelrückhubes und/oder der Druckzylinder zur Erzeugung des Hochdruckes des Druckmediums mit einer Einrichtung zur Erzeugung der Schwingung des Stempels bzw. mit einer Einrichtung zur Erzeugung der Schwingungen im Druckmedium gekoppelt. Weiterhin ist vorteilhafter Weise eine Steuereinrichtung vorgesehen, mit der die Stempelbewegung und die Schwingung des Stempels und/oder der Hochdruck des Druckmediums und dessen Schwingungsüberlagerung steuerbar sind.In the device for punching a workpiece on one side of the wall of the workpiece Stamp and on the other side of the wall High pressure room. There is also a source to provide a pressurized medium and one Pressure feeder for feeding the print medium into the High pressure room provided. According to the invention Printing cylinder for generating the stamp feed and Stamp return stroke and / or the pressure cylinder for generation the high pressure of the pressure medium with a device for Generation of the vibration of the stamp or with a Device for generating the vibrations in the pressure medium coupled. It is also advantageous Control device provided with the stamp movement and the vibration of the stamp and / or the high pressure of the Print medium and its vibration superposition controllable are.
Durch die Schwingungsüberlagerung der Stempelbewegung und/oder des Druckes des Druckmediums erfolgt das Schneiden in der Art eines pulsierenden Trennens der Wandung des Werkstückes im Rhythmus der jeweiligen Schwingungen.Due to the vibration superimposition of the stamp movement and / or the pressure of the printing medium is cut in the manner of a pulsating separation of the wall of the Workpiece in the rhythm of the respective vibrations.
Dadurch wird die Schnittflächenqualität wesentlich verbessert. Auch die Kantenformabweichung und der Grat werden reduziert. Die kleinere Schneidkraft ermöglicht auch, den Gegenhalterdruck zu verringern.This makes the cut surface quality essential improved. Also the edge shape deviation and the burr are reduced. The smaller cutting force enables also to reduce the counter pressure.
Die Erfindung wird nachfolgend anhand von Ausführungsbeispielen und zugehörigen Zeichnungen näher erläutert. The invention is based on Exemplary embodiments and associated drawings explained.
Es zeigen:
- Fig. 1:
- Vorrichtung mit schwingend schneidendem Stempel
- Fig. 2:
- Vorrichtung mit schwingend freigebendem Stempel
- Fig. 3:
- Weg-Zeit-Diagramm eines schwingend schneidenden Stempels
- Fig. 1:
- Device with swinging cutting punch
- Fig. 2:
- Device with swinging releasing stamp
- Fig. 3:
- Path-time diagram of a swinging cutting stamp
Die Vorrichtung weist ein Werkzeug 2 auf, zwischen dessen
Werkzeugoberteil 4 und Werkzeugunterteil 6 das Werkstück 8
druckmitteldicht eingespannt ist. Im Werkzeugoberteil 4
wird ein Stempel 10 geführt, der durch einen Antrieb 12 in
Richtung der Wandung des Werkstückes 8 (Vorschubbewegung)
und von dieser weg (Rückhubbewegung) bewegbar ist. Das
Werkzeugunterteil 6 besitzt einen Druckraum 14, der über
eine Druckzuführung 16 mit einer Hochdruckquelle 18 in
Verbindung steht. Der Antrieb 12 und die Hochdruckquelle 18
sind mit einer Steuereinrichtung 20 verbunden, die es
ermöglicht, die Stempelbewegung und/oder den Druck des
Druckmediums D im Rhythmus einer Schwingung zu steuern.The device has a
Obwohl sich diese schematische Darstellung auf den Aufbau
einer Vorrichtung in der Art zum hydromechanischen
Tiefziehen bezieht, trifft der Grundaufbau und das
Verfahren auch auf Vorrichtungen zum Innenhochdruck-Umformen
zu. Das Werkstück 8 ist dann nicht ein zwischen
zwei Werkzeughälften 4 und 6 eingespanntes Blech, sondern
ein zwischen zwei Werkzeughälften eingelegter und
anschließend mit Innenhochdruck beaufschlagter Hohlkörper.Although this schematic is based on the structure
a device in the manner of hydromechanical
Deep drawing refers to the basic structure and that
Process also on devices for hydroforming
to. The
Entsprechend des ersten Ausführungsbeispiels (Fig. 1)
erteilt die Steuereinrichtung 20 dem Stempel 10 über den
Antrieb 12 einen mit einer Schwingung überlagerten
konstanten Vorschub in Richtung der Wandung des Werkstückes
8. Indem der Stempel 10 je Schwingungsperiode immer ein
größeres Stück in die Wand 8 eindringt, als er sich daraus
zurückzieht, gelangt er schrittweise vorwärts, bis er sie
entgegen einem von der Steuereinrichtung 20 über die
Druckquelle 18 und den Kanal 16 aufrechterhaltenen
konstanten Innenhochdruck vollständig durchdrungen hat und
der Ausschnitt hergestellt ist. In Abhängigkeit vom
Werkstückwerkstoff und der gewünschten Geometrie des
Ausschnittes kann es vorteilhaft sein, den konstanten
Hochdruck durch einen schwingend oder nichtschwingend zu-
oder abnehmenden Hochdruck zu ersetzen.According to the first embodiment (Fig. 1)
issued the
Entsprechend eines weiteren Ausführungsbeispiels (Fig. 2)
ist es vorgesehen, den Stempel 10 durch Umkehr des
konstanten Vorschubs schwingend von der Wandung des
Werkstückes 8 wegzubewegen. Dabei kann der Druck des
Druckmediums D im Druckraum 14 konstant sein oder auch
schwingend oder nichtschwingend, beispielsweise linear
erhöht werden. Da der Stempel 10 je Schwingungsperiode
immer ein größeres Stück einer am Werkzeugteil 4
umlaufenden Schneidkante 22 freigibt als er sie wieder
verdeckt, trennt sich die Wandung 8 unter dem höher
werdenden Druck im Druckraum 14 schrittweise an der am
Werkzeug 2 umlaufenden Schneidkante 22 auf.According to a further exemplary embodiment (FIG. 2)
it is provided that the
Gemäß einem abschließenden Ausführungsbeispiel wird nur der
Hochdruck des Druckmediums D im Rhythmus einer Schwingung
gesteigert, während der Stempel 10 mit konstantem Vorschub
von der Wand 8 wegbewegt wird, so daß diese an der am
Werkzeug 2 umlaufenden Schneidkante 22 im Rhythmus der
Hochdruckschwingung geschnitten wird.According to a final embodiment, only the
High pressure of the pressure medium D in the rhythm of an oscillation
increased, while the
In Fig. 3 ist das Weg-Zeit-Diagramm eines die Wand 8
schwingend schneidenden Stempels 10 gezeigt. Unter dem
Einfluß der Steuereinrichtung 20 ist dem durch den Antrieb
12 realisierten Vorschub eine Schwingung mit einer Frequenz
von 17 Hz überlagert worden. Die Amplitude der
resultierenden Vorschubschwingung weist z.B. einen
positiven Anteil von 0,06 mm/s und einen negativen Anteil
von 0,04 mm/s auf. Auf dieser Basis durchdringt der Stempel
10 bei geringer Schneidkraft in die Wand eines Werkstücks
und hinterläßt dabei eine Lochung von hoher Qualität.3 is the path-time diagram of a
Ein vergleichbares Ergebnis läßt sich mit einer von einem Ultraschallgeber bereitgestellten Ultraschallschwingung erzielen, deren Frequenz vorzugsweise 20 kHz beträgt.A comparable result can be achieved with one of one Ultrasonic vibration provided by ultrasonic transducers achieve, whose frequency is preferably 20 kHz.
Claims (9)
- A method for punching a workpiece, with the workpiece (8) being arranged as a hollow body produced according to the internal high-pressure metal forming method or as a hydro-formed part and with the one side of the wall of the workpiece (8) being subjected to a pressure medium (D) which is under high pressure and its other side being subjected to the action of a punch (10) guided in a tool (2) and the punch (10) either cuts the wall of the workpiece (8) against the action of the pressure medium (D) or releases a circular cutting edge (22) formed on the tool (2) on which the wall of the workpiece (8) is cut under the influence of the increasing pressure of the pressure medium (D), or performs both successively, characterized in that the movement of the punch (10) in form of the advancing movement during the cutting of the wall of the workpiece (8) and/or in form of the return movement during the release of the circular cutting edge (22) of the tool (2) is overlapped by an oscillation and/or the application of the high pressure exerted on the wall (8) is performed by the pressure medium (D) in the rhythm of an oscillation.
- A method as claimed in claim 1, characterized in that the punching of the workpiece (8) by the punch (10) is performed by non-oscillating or oscillating, increasing or decreasing high pressure of the pressure medium (D).
- A method as claimed in claim 1 and 2, characterized in that the cutting of the wall of the workpiece (8) up to a residual wall thickness is started at first by using an advancing movement of the punch (10) and thereafter the circular cutting edge (22) is released by the punch (10) by using a return movement of the punch (10), so that the cutout (1) is cut out from the wall of the workpiece (8) by the high pressure of the pressure medium (D) under a simultaneous superposition of oscillation of the punching movement of the punch (10) and/or the pressure of the pressure medium (D).
- A method as claimed in one of the claims 1 to 3, characterized in that the start of the cutting of the wall of the workpiece (8) up to a residual wall thickness and the return movement of the punch (10) for the release of the circular cutting edge (22) by the punch (10) are performed alternatingly in the rhythm of an oscillation.
- A method as claimed in one of the claims 1 to 4, characterized in that the frequency of the oscillation of the punch (10) and/or the pressure medium (D) is in the magnitude of 5 to 50 Hz.
- A method as claimed in one of the claims 1 to 5, characterized in that the frequency of the oscillation of punch (10) and/or pressure medium (D) is in the ultrasonic range.
- A method as claimed in one of the claims 1 to 6, characterized in that the oscillation amplitudes and/or the frequencies of the oscillations of punch (10) and pressure medium (D) or the same or different.
- An apparatus for punching a workpiece, with a high-pressure deformation tool (2), with the punch (10) being arranged on one side of the wall of the workpiece (8) and with a high-pressure chamber (14) being disposed on the other side of the wall of the workpiece (8), and with a source (18) for providing a pressure medium (D) which can be pressurized with high pressure and a pressure supply line (16) for supplying the pressure medium to the high-pressure chamber, characterized in that the pressure cylinder (12) for producing the punch advancement and the punch return is coupled with a device for producing an oscillation of the punch (10) and/or that the pressure cylinder for producing the high pressure of the pressure medium is coupled with a device for producing an oscillation in the pressure medium.
- An apparatus as claimed in claim 8, characterized in that a control device (20) is provided with which the punch movement and the oscillation of the punch (10) and/or the high-pressure of the pressure medium (D) and its superposition of oscillations are controllable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19747607A DE19747607A1 (en) | 1997-10-28 | 1997-10-28 | Punching method for hollow workpieces |
| DE19747607 | 1997-10-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0920932A1 EP0920932A1 (en) | 1999-06-09 |
| EP0920932B1 true EP0920932B1 (en) | 2001-08-08 |
Family
ID=7846886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98120235A Expired - Lifetime EP0920932B1 (en) | 1997-10-28 | 1998-10-28 | Method and apparatus for punching a workpiece |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0920932B1 (en) |
| AT (1) | ATE203937T1 (en) |
| DE (2) | DE19747607A1 (en) |
| ES (1) | ES2162380T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10360738B4 (en) * | 2003-12-23 | 2006-02-02 | Daimlerchrysler Ag | Method and forming tool for cutting a hollow profile |
| DE102015106859B4 (en) * | 2015-05-04 | 2018-06-14 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method for shearing high-strength materials and cutting tool arrangement |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989482A (en) * | 1989-11-17 | 1991-02-05 | Ti Corporate Services Limited | Method and apparatus for punching a hole in sheet material |
| DE4035625A1 (en) * | 1990-11-09 | 1992-05-14 | Audi Ag | METHOD FOR PRODUCING A BREAKTHROUGH IN THE WALL OF A WORKPIECE DESIGNED AS A HOLLOW BODY, AND TOOL FOR CARRYING OUT THE METHOD |
| DE4322063C2 (en) * | 1993-07-02 | 1999-07-15 | Schaefer Hydroforming Gmbh | Method and device for cutting out a section of a wall of a hollow body produced by the hydroforming process |
| US5398533A (en) * | 1994-05-26 | 1995-03-21 | General Motors Corporation | Apparatus for piercing hydroformed part |
| DE4441192C2 (en) * | 1994-11-18 | 1998-05-20 | Schnupp Gmbh & Co Hydraulik Kg | Process for hydroforming |
| DE19506067C1 (en) * | 1995-02-22 | 1996-06-20 | Krupp Ag Hoesch Krupp | Aperture cutter for pressure moulded items |
-
1997
- 1997-10-28 DE DE19747607A patent/DE19747607A1/en not_active Ceased
-
1998
- 1998-10-28 ES ES98120235T patent/ES2162380T3/en not_active Expired - Lifetime
- 1998-10-28 AT AT98120235T patent/ATE203937T1/en not_active IP Right Cessation
- 1998-10-28 EP EP98120235A patent/EP0920932B1/en not_active Expired - Lifetime
- 1998-10-28 DE DE59801162T patent/DE59801162D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ES2162380T3 (en) | 2001-12-16 |
| DE19747607A1 (en) | 1999-05-06 |
| ATE203937T1 (en) | 2001-08-15 |
| EP0920932A1 (en) | 1999-06-09 |
| DE59801162D1 (en) | 2001-09-13 |
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