EP2208552B2 - Method and device for fine cutting of workpieces - Google Patents

Method and device for fine cutting of workpieces Download PDF

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Publication number
EP2208552B2
EP2208552B2 EP09000652.9A EP09000652A EP2208552B2 EP 2208552 B2 EP2208552 B2 EP 2208552B2 EP 09000652 A EP09000652 A EP 09000652A EP 2208552 B2 EP2208552 B2 EP 2208552B2
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EP
European Patent Office
Prior art keywords
cutting
punch
plate
counter
support
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.)
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EP09000652.9A
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German (de)
French (fr)
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EP2208552A1 (en
EP2208552B1 (en
Inventor
Martin Zimmermann
Martin Watermann
Konrad Trump
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Finova Feinschneidtechnik GmbH
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Finova Feinschneidtechnik GmbH
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Priority to ES09000652.9T priority Critical patent/ES2361140T5/en
Priority to PL09000652T priority patent/PL2208552T5/en
Priority to AT09000652T priority patent/ATE505278T1/en
Priority to SI200930040T priority patent/SI2208552T2/en
Priority to EP09000652.9A priority patent/EP2208552B2/en
Application filed by Finova Feinschneidtechnik GmbH filed Critical Finova Feinschneidtechnik GmbH
Priority to DE502009000546T priority patent/DE502009000546D1/en
Publication of EP2208552A1 publication Critical patent/EP2208552A1/en
Publication of EP2208552B1 publication Critical patent/EP2208552B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • 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
    • 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
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/28—Making other particular articles wheels or the like gear wheels

Definitions

  • the invention relates to a device for fine cutting of workpieces, such as gears od.
  • a device for fine cutting of workpieces such as gears od.
  • a device for fine cutting of workpieces such as gears od.
  • a device for fine cutting of workpieces such as gears od.
  • a device for positive guidance a pressure plate and a cutting plate, in which a counter-holder is guided, wherein between the pressing plate and the cutting plate, a sheet is held immovable, wherein at least the cutting punch and the cutting plate are rotatably arranged relative to each other and the cutting punch is provided with arranged at an angle to the vertical direction of movement of the cutting punch cutting surfaces
  • a similar device according to the prior art is basically from the DE OS 3324680 known.
  • punching this is a process in which the material - usually a metal strip - is firmly clamped before and during the cutting process and guided with narrow tolerances.
  • the sheet metal strip is clamped between the cutting plate and the pressure plate before the cutting process.
  • An additional clamping of the metal strip is done between the anvil and the cutting punch, with the respective forces initially keep the balance.
  • By increasing the punch force of the cutting process is initiated, so that the punch displaces the counter-holder.
  • the cut-out workpiece is ejected from the counter-holder from the cutting plate and advanced the metal strip for the next cutting operation.
  • a device is known from the documentally uncontrollable prior art, in which additionally the cutting punch and the cutting plate are rotatably arranged relative to each other and the cutting punch is provided with arranged at an angle to the vertical direction of movement of the cutting punch cutting surfaces.
  • the object of the invention is to provide a device which has a bearing of the cutting punch for large loads, the cost of storage should be as low as possible.
  • the cutting punch has a Stempelfuß which is rotatably mounted in a pressure chamber of an upper set, which is filled with a rotary bearing serving hydraulic fluid, preferably oil, and is closed by a check valve, so that the cutting punch is stored during a cutting process with the aid of an oil pad and the surfaces of the stamp foot and headset are separated.
  • a Stempelfuß which is rotatably mounted in a pressure chamber of an upper set, which is filled with a rotary bearing serving hydraulic fluid, preferably oil, and is closed by a check valve, so that the cutting punch is stored during a cutting process with the aid of an oil pad and the surfaces of the stamp foot and headset are separated.
  • the essential advantage of the new apparatus for fineblanking according to the invention is that the cutting punch has a stamp foot, which is rotatably mounted in a pressure space which is filled with hydraulic fluid. As a result, it is advantageously achieved in the bearing area of the stamp, even at high loads, that the surfaces are separated from one another. Due to the generous thickness of the oil poster of several millimeters rotates the Stempelfuß at any time exclusively on the oil pad.
  • the Fig. 1 shows that, in contrast to punching during fine cutting in addition to a cutting punch A and a cutting plate B, a counter-holder C and a guide plate D is present, wherein in the guide plate D a ring point E is integrated, with a complete clamping of the metal strip G in the Cutting line is enabled. Due to the complete clamping of the metal strip G is in the shear zone during the cutting process before a pure shear, which completely smooth Cutting surfaces without fracture zones can arise. This is achieved, inter alia, by a significantly reduced cutting gap.
  • the cutting punch A is loaded with the punch force F ST , the metal strip G with the ring-tooth force F R , the counter-holder C with the counter-holding force F G and the cutting plate B is loaded with the ram force F plunger .
  • Fig. 1 shows that in fine cutting according to the prior art, the cutting punch A performs a purely vertical, at right angles to the metal strip G extending cutting motion, so that the created cut surfaces are arranged at a right angle to the sheet metal strip plane.
  • Fig. 2 is a helical gear S shown, which nowadays has a wide range of applications in different embodiments, but with a device according to the Fig. 1 can not be produced according to the prior art.
  • Such a device 10 is formed on the one hand by a rotating cutting punch 11, which is arranged in a rotationally fixed guide plate 12.
  • the cutting punch 11 has an external helical gearing 13 a and is guided by a matching internal helical gearing 13 b of the guide plate 12.
  • the device 10 a within a rotationally fixed cutting plate 15 also rotatably arranged counter-holder 14 with a helical toothing 16 a , which also by means of a helical gearing 16 b of the cutting plate 15 is guided.
  • the aforementioned helical gears 13 a and 16 a of the cutting punch 11 and the counter-holder 14 are provided with arranged at an angle to the vertical cutting surfaces.
  • a metal strip 17 is arranged, which is additionally fully clamped by a ring not shown between cutting plate 15 and guide plate 12.
  • the cutting punch 11 and counter-holder 14 with their respective helical gears 13 and 16 occupy a position relative to one another that the respective cutting surfaces of the helical gears 13 and 16 have matching cutting lines s.
  • the device 10 is provided in a manner not shown with a device for the exact positioning of the helical teeth 16 of the counter-holder 14 to the helical teeth 13 of the punch 11.
  • a so-called top 20 is provided with a pressure chamber 21 in which a Stempelfuß 22 is guided vertically movable, which is connected to the cutting punch 11.
  • the pressure chamber 21 is filled with a hydraulic fluid, preferably oil, and closed in a manner not shown by a check valve. With the help of this arrangement, a storage of the cutting punch 11 during the cutting process by means of an oil pad 23 is possible.
  • the oil pad 23 as a variant of the so-called hydrostatic principle ensures automatically then the separation of the surfaces of Stkovfuß 22 and 20 set when the loads are large.
  • the effort for the supply of the device is extremely low, since the fine cutting oil used as a printing medium is already available in a suitably biased reservoir at the press.
  • the Stempelfußes 22 By the storage of the Stempelfußes 22 on an oil pad 23, the required separation of the surfaces of Stempelfuß 22 and 20 set is reliably met. Due to the generous thickness of the oil pad 23 of several millimeters, the Stempelfuß 22 rotates at all times exclusively on the oil pad 23. A backflow of oil through the supply line is prevented by a non-illustrated check valve, the effect of which increases itself with increasing pressure in the oil pad 23.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Punching Or Piercing (AREA)
  • Turning (AREA)
  • Control Of Cutting Processes (AREA)

Abstract

The method involves clamping a sheet metal between a press-plate and a cutting plate (15), and guiding a cutting stamp (11) by a workpiece guiding device. The workpiece is cut by a cutting contour and cutting surfaces of the cutting stamp. An opposite acting counter holder (14) is guided in the cutting plate. A vertical relative motion and a rotative relative motion are taken in relation to the cutting plate by the cutting stamp during the cutting process. Extensions of cutting surfaces are laid one above the other. An independent claim is also included for a device for fine cutting a workpiece.

Description

Die Erfindung betrifft eine Vorrichtung zum Feinschneiden von Werkstücken, wie Zahnräder od. dgl., im Wesentlichen bestehend aus einem, mit einer Schneidkontur sowie Schneidflächen versehenen Schneidstempel, der mit einer Einrichtung zur Zwangsführung versehen ist, einer Pressplatte sowie einer Schneidplatte, in der ein Gegenhalter geführt ist, wobei zwischen der Pressplatte und der Schneidplatte ein Blech unverrückbar gehalten ist, wobei zumindest der Schneidstempel und die Schneidplatte relativ zueinander drehbar angeordnet sind und der Schneidstempel mit im Winkel zur vertikalen Bewegungsrichtung des Schneidstempels angeordneten Schneidflächen versehen istThe invention relates to a device for fine cutting of workpieces, such as gears od. Like., Essentially consisting of a, provided with a cutting contour and cutting surfaces cutting punch, which is provided with a device for positive guidance, a pressure plate and a cutting plate, in which a counter-holder is guided, wherein between the pressing plate and the cutting plate, a sheet is held immovable, wherein at least the cutting punch and the cutting plate are rotatably arranged relative to each other and the cutting punch is provided with arranged at an angle to the vertical direction of movement of the cutting punch cutting surfaces

Eine ähnliche Vorrichtung nach dem Stand der Technik ist grundsätzlich aus der DE OS 3324680 bekannt. Im Gegensatz zum Stanzen handelt es sich hierbei um ein Verfahren, bei dem der Werkstoff - meist ein Blechstreifen - vor und während des Schneidvorganges fest eingespannt und mit engen Toleranzen geführt wird. So wird vor dem Schneidvorgang der Blechstreifen zwischen der Schneidplatte und der Pressplatte eingeklemmt. Eine zusätzliche Einspannung des Blechstreifens geschieht zwischen dem Gegenhalter und dem Schneidstempel, wobei sich die jeweiligen Kräfte zunächst die Waage halten. Durch Erhöhung der Stempelkraft wird der Schneidvorgang eingeleitet, so dass der Schneidstempel den Gegenhalter verdrängt. Letztlich wird das herausgeschnittene Werkstück vom Gegenhalter aus der Schneidplatte ausgeworfen und der Blechstreifen für den nächsten Schneidvorgang vorgeschoben.A similar device according to the prior art is basically from the DE OS 3324680 known. In contrast to punching, this is a process in which the material - usually a metal strip - is firmly clamped before and during the cutting process and guided with narrow tolerances. Thus, the sheet metal strip is clamped between the cutting plate and the pressure plate before the cutting process. An additional clamping of the metal strip is done between the anvil and the cutting punch, with the respective forces initially keep the balance. By increasing the punch force of the cutting process is initiated, so that the punch displaces the counter-holder. Finally, the cut-out workpiece is ejected from the counter-holder from the cutting plate and advanced the metal strip for the next cutting operation.

Darüberhinaus ist aus dem druckschriftlich nicht belegbaren Stand der Technik eine Vorrichtung bekannt, bei der zusätzlich der Schneidstempel und die Schneidplatte relativ zueinander drehbar angeordnet sind und der Schneidstempel mit im Winkel zur vertikalen Bewegungsrichtung des Schneidstempels angeordneten Schneidflächen versehen ist.Moreover, a device is known from the documentally uncontrollable prior art, in which additionally the cutting punch and the cutting plate are rotatably arranged relative to each other and the cutting punch is provided with arranged at an angle to the vertical direction of movement of the cutting punch cutting surfaces.

Bei dieser grundsätzlich vorteilhaften Vorrichtung wird jedoch die Lagerung des Schneidstempels als verbesserungswürdig angesehen.In this basically advantageous device, however, the storage of the cutting punch is considered to be in need of improvement.

Ausgehend von dem oben dargelegten Stand der Technik besteht die Aufgabe der Erfindung darin, eine Vorrichtung zu schaffen, die eine Lagerung des Schneidstempels für große Belastungen aufweist, wobei der Aufwand für die Lagerung möglichst gering sein sollte.Based on the above-described prior art, the object of the invention is to provide a device which has a bearing of the cutting punch for large loads, the cost of storage should be as low as possible.

Die Lösung der Aufgabe ergibt sich aus den Merkmalen des Anspruchs 1, insbesondere den Merkmalen des Kennzeichenteils, wonach der Schneidstempel einen Stempelfuß aufweist, der in einem Druckraum eines Obersatzes drehbar gelagert ist, welcher mit einer der Drehlagerung dienenden Hydraulikflüssigkeit, vorzugsweise Öl, gefüllt ist und von einem Rückschlagventil verschlossen ist, so dass der Schneidstempel während eines Schneidvorgangs mit Hilfe eines Ölpolsters gelagert ist und die Oberflächen von Stempelfuß und Obersatz getrennt sind.The solution of the problem arises from the features of claim 1, in particular the features of the characterizing part, according to which the cutting punch has a Stempelfuß which is rotatably mounted in a pressure chamber of an upper set, which is filled with a rotary bearing serving hydraulic fluid, preferably oil, and is closed by a check valve, so that the cutting punch is stored during a cutting process with the aid of an oil pad and the surfaces of the stamp foot and headset are separated.

Der wesentliche erfindungsgemäße Vorteil der neuen Vorrichtung zum Feinschneiden besteht darin, dass der Schneidstempel einen Stempelfuß aufweist, der in einem Druckraum drehbar gelagert ist, welcher mit Hydraulikflüssigkeit gefüllt ist. Hierdurch wird auf vorteilhafte Weise im Lagerbereich des Stempels auch bei großen Belastungen erreicht, dass die Oberflächen voneinander getrennt sind. Durch die großzügige Dicke des Ölposters von mehreren Millimetern rotiert der Stempelfuß jederzeit ausschließlich auf dem Ölpolster.The essential advantage of the new apparatus for fineblanking according to the invention is that the cutting punch has a stamp foot, which is rotatably mounted in a pressure space which is filled with hydraulic fluid. As a result, it is advantageously achieved in the bearing area of the stamp, even at high loads, that the surfaces are separated from one another. Due to the generous thickness of the oil poster of several millimeters rotates the Stempelfuß at any time exclusively on the oil pad.

Weitere Vorteile der Erfindung ergeben sich aus den nachfolgenden Unteransprüchen sowie aus der Beschreibung eines Ausführungsbeispiels.Further advantages of the invention will become apparent from the following dependent claims and from the description of an embodiment.

Es zeigen:

  • Fig. 1 eine prinzipielle Darstellung des Feinschneidens nach dem Stand der Technik,
  • Fig. 2 eine Abbildung eines Schrägstirnrades,
  • Fig. 3 eine prinzipielle Darstellung des rotationsüberlagerten Feinschneidens und
  • Fig. 4 eine Darstellung einer Lagerung des Schneidstempels gemäß Fig. 4
Show it:
  • Fig. 1 a schematic representation of the fine blanking according to the prior art,
  • Fig. 2 an illustration of a helical gear,
  • Fig. 3 a schematic representation of the rotationally superimposed fineblanking and
  • Fig. 4 an illustration of a storage of the cutting punch according to Fig. 4

In den Figuren 1 und 2 ist zunächst prinzipiell das Feinschneiden nach dem Stand der Technik dargestellt.In the FIGS. 1 and 2 First of all, the fine blanking according to the prior art is shown in principle.

Die Fig. 1 zeigt, dass im Unterschied zum Stanzen beim Feinschneiden zusätzlich neben einem Schneidstempel A und einer Schneidplatte B ein Gegenhalter C und eine Führungsplatte D vorhanden ist, wobei in die Führungsplatte D eine Ringzacke E integriert ist, mit der eine vollständige Einspannung des Blechstreifens G im Bereich der Schnittlinie ermöglicht wird. Durch die vollständige Einspannung des Blechstreifens G liegt in der Scherzone während des Schnittvorgangs eine reine Scherung vor, wodurch vollständig glatte Schnittflächen ohne Bruchzonen entstehen können. Dies wird unter anderem durch einen deutlich reduzierten Schneidspalt erreicht.The Fig. 1 shows that, in contrast to punching during fine cutting in addition to a cutting punch A and a cutting plate B, a counter-holder C and a guide plate D is present, wherein in the guide plate D a ring point E is integrated, with a complete clamping of the metal strip G in the Cutting line is enabled. Due to the complete clamping of the metal strip G is in the shear zone during the cutting process before a pure shear, which completely smooth Cutting surfaces without fracture zones can arise. This is achieved, inter alia, by a significantly reduced cutting gap.

Des Weiteren erkennt man in der Fig. 1, dass der Schneidstempel A mit der Stempelkraft FST, der Blechstreifen G mit der Ringzackenkraft FR, der Gegenhalter C mit der Gegenhalterkraft FG und die Schneidplatte B mit der Stößelkraft FStößel belastet wird.Furthermore one recognizes in the Fig. 1 in that the cutting punch A is loaded with the punch force F ST , the metal strip G with the ring-tooth force F R , the counter-holder C with the counter-holding force F G and the cutting plate B is loaded with the ram force F plunger .

Die prinzipielle Darstellung gemäß Fig. 1 zeigt, dass beim Feinschneiden nach dem Stand der Technik der Schneidstempel A eine rein vertikale, im rechten Winkel zum Blechstreifen G verlaufende Schneidbewegung vollzieht, so dass die erstellten Schnittflächen in einem rechten Winkel zur Blechstreifenebene angeordnet sind.The basic representation according to Fig. 1 shows that in fine cutting according to the prior art, the cutting punch A performs a purely vertical, at right angles to the metal strip G extending cutting motion, so that the created cut surfaces are arranged at a right angle to the sheet metal strip plane.

In der Fig. 2 ist ein Schrägstirnrad S abgebildet, welches heutzutage einen großen Einsatzbereich in unterschiedlichen Ausgestaltungen aufweist, jedoch mit einer Vorrichtung gemäß der Fig. 1 nach dem Stand der Technik nicht herstellbar ist.In the Fig. 2 is a helical gear S shown, which nowadays has a wide range of applications in different embodiments, but with a device according to the Fig. 1 can not be produced according to the prior art.

In den Figuren 3 und 4 ist eine Vorrichtung zum rotationsüberlagerten Feinschneiden dargestellt und insgesamt mit der Bezugsziffer 10 bezeichnet.In the Figures 3 and 4 an apparatus for rotationally superimposed fine cutting is shown and indicated generally by the reference numeral 10.

Eine derartige Vorrichtung 10 wird einerseits von einem rotierenden Schneidstempel 11 gebildet, der in einer drehfesten Führungsplatte 12 angeordnet ist. Der Schneidstempel 11 weist eine Außen-Schrägverzahnung 13a auf und wird durch eine übereinstimmende Innen-Schrägverzahnung 13b der Führungsplatte 12 geführt.Such a device 10 is formed on the one hand by a rotating cutting punch 11, which is arranged in a rotationally fixed guide plate 12. The cutting punch 11 has an external helical gearing 13 a and is guided by a matching internal helical gearing 13 b of the guide plate 12.

Darüber hinaus weist die Vorrichtung 10 einen innerhalb einer drehfesten Schneidplatte 15 ebenfalls rotierend angeordneten Gegenhalter 14 mit einer Schrägverzahnung 16a auf, der ebenfalls mittels einer Schrägverzahnung 16b der Schneidplatte 15 geführt ist. Die vorgenannten Schrägverzahnungen 13a und 16a des Schneidstempels 11 sowie des Gegenhalters 14 sind mit im Winkel zur Vertikalen angeordneten Schneidflächen versehen. Zwischen dem Schneidstempel 11 und der Führungsplatte 12 einerseits und dem Gegenhalter 14 bzw. der Schneidplatte 15 andererseits ist ein Blechstreifen 17 angeordnet, der zusätzlich durch eine nicht dargestellte Ringzacke zwischen Schneidplatte 15 und Führungsplatte 12 vollständig eingespannt ist.In addition, the device 10 a within a rotationally fixed cutting plate 15 also rotatably arranged counter-holder 14 with a helical toothing 16 a , which also by means of a helical gearing 16 b of the cutting plate 15 is guided. The aforementioned helical gears 13 a and 16 a of the cutting punch 11 and the counter-holder 14 are provided with arranged at an angle to the vertical cutting surfaces. Between the cutting punch 11 and the guide plate 12 on the one hand and the counter-holder 14 and the cutting plate 15 on the other hand, a metal strip 17 is arranged, which is additionally fully clamped by a ring not shown between cutting plate 15 and guide plate 12.

Vor dem Beginn eines Schneidvorganges ist es zwingend erforderlich, dass Schneidstempel 11 und Gegenhalter 14 mit ihren jeweiligen Schrägverzahnungen 13 und 16 eine Position zueinander einnehmen, dass die jeweiligen Schneidflächen der Schrägverzahnungen 13 bzw. 16 übereinstimmende Schnittlinien s aufweisen. Zu diesem Zweck ist die Vorrichtung 10 auf nicht dargestellte Weise auch mit einer Einrichtung zur exakten Positionierung der Schrägverzahnung 16 des Gegenhalters 14 zur Schrägverzahnung 13 des Stempels 11 versehen.Before the start of a cutting operation, it is imperative that the cutting punch 11 and counter-holder 14 with their respective helical gears 13 and 16 occupy a position relative to one another that the respective cutting surfaces of the helical gears 13 and 16 have matching cutting lines s. For this purpose, the device 10 is provided in a manner not shown with a device for the exact positioning of the helical teeth 16 of the counter-holder 14 to the helical teeth 13 of the punch 11.

In der Fig. 4 ist ergänzend die Lagerung des Schneidstempels 11 dargestellt.In the Fig. 4 In addition, the storage of the cutting punch 11 is shown.

Man erkennt grundsätzlich die in der Fig. 3 dargestellte Vorrichtung bestehend aus Schneidstempel 11, Führungsplatte 12, Schrägverzahnungen 13/16, Gegenhalter 14 sowie Schneidplatte 15.One recognizes basically the in the Fig. 3 shown device consisting of cutting punch 11, guide plate 12, helical gears 13/16, counter-holder 14 and cutting plate 15th

Zusätzlich sind ein Innenformgegenhalter sowie ein Innenformstempel 18 und 19 dargestellt, welche jedoch im Folgenden keine Bedeutung aufweisen.In addition, a Innenformgegenhalter and an inner mold punch 18 and 19 are shown, which, however, have no significance in the following.

Ein sogenannter Obersatz 20 ist mit einem Druckraum 21 versehen, in dem ein Stempelfuß 22 vertikal beweglich geführt ist, der mit dem Schneidstempel 11 verbunden ist. Der Druckraum 21 ist mit einer Hydraulikflüssigkeit, vorzugsweise Öl, befüllt und auf nicht dargestellte Weise von einem Rückschlagventil verschlossen. Mit Hilfe dieser Anordnung ist eine Lagerung des Schneidstempels 11 während des Schneidvorgangs mit Hilfe eines Ölpolsters 23 möglich.A so-called top 20 is provided with a pressure chamber 21 in which a Stempelfuß 22 is guided vertically movable, which is connected to the cutting punch 11. The pressure chamber 21 is filled with a hydraulic fluid, preferably oil, and closed in a manner not shown by a check valve. With the help of this arrangement, a storage of the cutting punch 11 during the cutting process by means of an oil pad 23 is possible.

Das Ölpolster 23 als Variante des sogenannten hydrostatischen Prinzips sichert genau dann automatisch die Trennung der Oberflächen von Stempelfuß 22 und Obersatz 20, wenn die Belastungen groß sind. Der Aufwand für die Versorgung der Einrichtung ist äußerst gering, da das als Druckmedium verwendete Feinschneidöl bereits in einem entsprechend vorgespannten Vorratsbehälter an der Presse zur Verfügung steht. Durch die Lagerung des Stempelfußes 22 auf einem Ölpolster 23 wird die geforderte Trennung der Oberflächen von Stempelfuß 22 und Obersatz 20 zuverlässig erfüllt. Durch die großzügige Dicke des Ölpolsters 23 von mehreren Millimetern rotiert der Stempelfuß 22 jederzeit ausschließlich auf dem Ölpolster 23. Ein Rückfluss von Öl durch die Zuleitung wird durch ein nicht dargestelltes Rückschlagventil verhindert, dessen Wirkung sich bei steigendem Druck im Ölpolster 23 selbst verstärkt.The oil pad 23 as a variant of the so-called hydrostatic principle ensures automatically then the separation of the surfaces of Stempelfuß 22 and 20 set when the loads are large. The effort for the supply of the device is extremely low, since the fine cutting oil used as a printing medium is already available in a suitably biased reservoir at the press. By the storage of the Stempelfußes 22 on an oil pad 23, the required separation of the surfaces of Stempelfuß 22 and 20 set is reliably met. Due to the generous thickness of the oil pad 23 of several millimeters, the Stempelfuß 22 rotates at all times exclusively on the oil pad 23. A backflow of oil through the supply line is prevented by a non-illustrated check valve, the effect of which increases itself with increasing pressure in the oil pad 23.

Claims (5)

  1. A device for the precision blanking of workpieces, such as toothed wheels or the like, substantially consisting of a cutting punch (11) provided with a cutting contour and cutting surfaces, which punch is provided with a means for constrained guidance, a pressing plate and a cutting plate (15), in which a counter-support (14) is guided, with a metal sheet being able to be held in non-shiftable manner between the pressing plate and the cutting plate (15), at least the cutting punch (11) and the cutting plate (15) being arranged rotatably relative to each other and the cutting punch (11) being provided with cutting surfaces arranged in angle to the vertical direction of movement of the cutting punch (11) characterised in that the cutting punch (11) has a punch foot (22) which is rotatably mounted in a pressure space (21) of an upper set (20) which is filled with hydraulic fluid, preferably oil, that serves pivotal positioning and which is closed by a non-return valve, so that the cutting punch (11) is buffered by an oil pad (23) during the cutting process and the surfaces of punch foot (22) and upper set (20) keep separated.
  2. A device according to claim 1, characterised in that also the counter support (14) and cutting plate (15) are rotatably arranged relative to each other and has a cutting contour formed analogously to the cutting punch (11), and also cutting surfaces.
  3. A device according to claim 2, characterised in that the cutting punch (11) and the counter-support (14) are rotatably mounted, and in that the pressing plate (12) and cutting plate (15) are mounted non-rotatably, but vertically movable.
  4. A device according to claim 1 to 3 characterised by a means for synchronization of the cutting punch (11) and counter-support (14) with regard to their cutting lines and the speed of rotation during precision blanking.
  5. A device according to claim 1, characterized in that the cutting contour or the cutting surfaces of the cutting punch (11) or of the counter-support (14) are formed as helical gearing (13a,16a).
EP09000652.9A 2009-01-19 2009-01-19 Method and device for fine cutting of workpieces Active EP2208552B2 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
PL09000652T PL2208552T5 (en) 2009-01-19 2009-01-19 Method and device for fine cutting of workpieces
AT09000652T ATE505278T1 (en) 2009-01-19 2009-01-19 METHOD AND DEVICE FOR FINE CUTTING OF WORKPIECES
SI200930040T SI2208552T2 (en) 2009-01-19 2009-01-19 Method and device for fine cutting of workpieces
EP09000652.9A EP2208552B2 (en) 2009-01-19 2009-01-19 Method and device for fine cutting of workpieces
ES09000652.9T ES2361140T5 (en) 2009-01-19 2009-01-19 Procedure and device for precision cutting of work pieces
DE502009000546T DE502009000546D1 (en) 2009-01-19 2009-01-19 Method and device for fine cutting workpieces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09000652.9A EP2208552B2 (en) 2009-01-19 2009-01-19 Method and device for fine cutting of workpieces

Publications (3)

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EP2208552A1 EP2208552A1 (en) 2010-07-21
EP2208552B1 EP2208552B1 (en) 2011-04-13
EP2208552B2 true EP2208552B2 (en) 2014-06-04

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EP (1) EP2208552B2 (en)
AT (1) ATE505278T1 (en)
DE (1) DE502009000546D1 (en)
ES (1) ES2361140T5 (en)
PL (1) PL2208552T5 (en)
SI (1) SI2208552T2 (en)

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DE102011102288B4 (en) 2011-05-23 2013-03-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Device and method for producing a spur gear with a helical toothing
US9676021B2 (en) * 2012-07-06 2017-06-13 Lapmaster International L.L.C. Stamping press
EP2842653B1 (en) * 2013-08-28 2016-05-11 Feintool International Holding AG Tool and method for the production of stamped parts
CN104001806B (en) * 2014-06-05 2015-09-30 武汉理工大学 A kind of sheet forming mould of helical gears and method
DE102015204415A1 (en) * 2015-03-12 2016-09-15 Bayerische Motoren Werke Aktiengesellschaft Impact cutting tool
CN108435912B (en) * 2018-03-08 2020-06-30 皖西学院 Cylindrical helical gear twisting and pressing forming die and forming method thereof
DE102022205021A1 (en) 2022-05-19 2023-11-23 Universität Stuttgart, Körperschaft Des Öffentlichen Rechts Hold-down device for a cutting tool for shear cutting a workpiece

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DE3234771A1 (en) † 1982-09-20 1984-03-22 Alfred Teves Gmbh, 6000 Frankfurt Method for blanking out teeth and apparatus for carrying out the method
DE3423543A1 (en) † 1983-06-28 1985-01-03 Repco Ltd., Melbourne, Victoria PRESS AND METHOD FOR PRODUCING THE SAME
WO2004094083A2 (en) † 2003-04-22 2004-11-04 Neumayer Tekfor Gmbh Method for producing a cup-shaped annular part having an inner toothing, a cup-shaped preform and a cup-shaped annular part

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DE3324680A1 (en) * 1983-07-08 1985-01-24 DAKO-Werkzeugfabriken David Kotthaus GmbH & Co KG, 5630 Remscheid METHOD FOR FINE CUTTING WORKPIECES AND FINE CUTTING TOOL FOR EXERCISING THE METHOD
JP2879187B2 (en) * 1993-10-18 1999-04-05 大岡技研株式会社 Multistage gear forging method and apparatus
JP2002307130A (en) * 2001-04-11 2002-10-22 Araco Corp Ring gear manufacturing method, and device used therefor
JP3975715B2 (en) * 2001-10-10 2007-09-12 トヨタ紡織株式会社 Press forming method and apparatus used therefor

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DE3234771A1 (en) † 1982-09-20 1984-03-22 Alfred Teves Gmbh, 6000 Frankfurt Method for blanking out teeth and apparatus for carrying out the method
DE3423543A1 (en) † 1983-06-28 1985-01-03 Repco Ltd., Melbourne, Victoria PRESS AND METHOD FOR PRODUCING THE SAME
WO2004094083A2 (en) † 2003-04-22 2004-11-04 Neumayer Tekfor Gmbh Method for producing a cup-shaped annular part having an inner toothing, a cup-shaped preform and a cup-shaped annular part
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Also Published As

Publication number Publication date
EP2208552A1 (en) 2010-07-21
SI2208552T2 (en) 2014-09-30
PL2208552T3 (en) 2011-09-30
SI2208552T1 (en) 2011-08-31
ES2361140T5 (en) 2014-08-12
ATE505278T1 (en) 2011-04-15
PL2208552T5 (en) 2014-10-31
ES2361140T3 (en) 2011-06-14
DE502009000546D1 (en) 2011-05-26
EP2208552B1 (en) 2011-04-13

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