EP2208552B1 - 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
EP2208552B1
EP2208552B1 EP09000652A EP09000652A EP2208552B1 EP 2208552 B1 EP2208552 B1 EP 2208552B1 EP 09000652 A EP09000652 A EP 09000652A EP 09000652 A EP09000652 A EP 09000652A EP 2208552 B1 EP2208552 B1 EP 2208552B1
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EP
European Patent Office
Prior art keywords
cutting
punch
counter
plate
support
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EP09000652A
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German (de)
French (fr)
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EP2208552B2 (en
EP2208552A1 (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 SI200930040T priority patent/SI2208552T2/en
Priority to EP09000652.9A priority patent/EP2208552B2/en
Priority to PL09000652T priority patent/PL2208552T5/en
Priority to AT09000652T priority patent/ATE505278T1/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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    • 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 first to a method for fine cutting of workpieces, such as gears od.
  • the material preferably sheet metal
  • clamped at least between a press plate and a cutting plate and a cutting punch is forcibly guided by means for guiding and the workpiece by means of a cutting contour and cutting surfaces of the cutting punch and an oppositely acting, guided in the cutting plate counter-holder is cut out.
  • Such a method according to the prior art is basically from DE OS 3324680 known.
  • 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.
  • Such a method advantageously has a significantly reduced cutting gap with respect to stamping, as a result of which a higher dimensional accuracy of the cut surfaces is achieved.
  • the object of the invention is to provide a new method for fine cutting of workpieces, such as gears od. Like., which has a wider range of applications.
  • the inventive method for fine blanking has the fundamental advantage that the application of fineblanking is extended to workpieces whose cut surfaces are not perpendicular to the sheet plane, making it possible, for example, to produce the increasingly important helical gears. Since only the time-consuming machining production of helical gears was possible in the past, the inventive method not only allows a significant expansion of the application of fineblanking, but also a much cheaper production of helical gears.
  • the helical gears can not be cut directly from a sheet metal strip, but it must previously sheet blanks (boards) are created, the outer diameter have the later tip diameter of the helical gear.
  • the board having a corresponding opening is fixed against rotation on the underside of the cutting punch.
  • the cutting process is initiated.
  • the cutting punch is pressed down with the board arranged underneath.
  • the cutting punch and counter-holder before fine cutting a position to each other, in which the extension of the respective cutting surfaces are superimposed and move punch and counter-holder during fine cutting in terms of their rotation synchronously.
  • the quality of the created cut surfaces, in particular in the workpiece area close to the counter-holder, is significantly improved by this interaction between the punch and the counter-holder, since the counter-holder has an improved support function with respect to the workpiece during the cutting process.
  • the invention according to claim 4 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 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.
  • the object of the invention is to provide a device which has an extended application range in the production of workpieces by means of the fine blanking technique.
  • the essential advantage of the new apparatus for fineblanking according to the invention now consists in the fact that it can also be used to create cut surfaces which are not arranged perpendicular to the sheet plane. As a result, it is now possible to expand the field of application of fineblanking, for example, to the increasingly important helical gears.
  • the counter-holder and the cutting plate are rotatably arranged relative to one another and have a cutting contour of analogous design to the cutting punch and cutting surfaces.
  • the cutting punch and the counter-holder are rotatably mounted and the Press plate and the cutting plate reversible, but mounted vertically movable.
  • An additional device for the synchronization of cutting punch and counter-holder with respect to their cutting lines and the rotational speed during fine cutting has a particularly preferred embodiment of the invention. This improves the interaction of the cutting punch and the counter-holder during the cutting process, so that the quality of the created cut surfaces is greater, in particular in the workpiece area close to the counter-holder, since the counter-holder has an improved support function relative to the workpiece during the cutting process.
  • the cutting punch has a punch foot which is rotatably mounted in a pressure space which is filled with hydraulic fluid.
  • 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 spike 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, there is a pure shear in the shearing zone during the cutting process, whereby completely smooth cut surfaces without fracture zones can arise. This is achieved, inter alia, by a significantly reduced cutting gap.
  • 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 is also guided by means of a helical toothing 16 b of the cutting plate 15.
  • 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 a position to each other assume 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 pressure medium already in a suitably biased reservoir to the press for Available.
  • 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)
  • Control Of Cutting Processes (AREA)
  • Turning (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 zunächst ein Verfahren zum Feinschneiden von Werkstücken, wie Zahnräder od. dgl., bei dem der Werkstoff, vorzugsweise Blech, zumindest zwischen einer Pressplatte und einer Schneidplatte eingespannt und ein Schneidstempel mittels einer Einrichtung zur Führung zwangsgeführt ist sowie das Werkstück mittels einer Schneidkontur sowie Schneidflächen des Schneidstempels und eines entgegengesetzt wirkenden, in der Schneidplatte geführten Gegenhalters ausgeschnitten wird.The invention relates first to a method for fine cutting of workpieces, such as gears od. Like., In which the material, preferably sheet metal, clamped at least between a press plate and a cutting plate and a cutting punch is forcibly guided by means for guiding and the workpiece by means of a cutting contour and cutting surfaces of the cutting punch and an oppositely acting, guided in the cutting plate counter-holder is cut out.

Ein derartiges Verfahren 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.Such a method according to the prior art is basically from 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.

Ein derartiges Verfahren weist auf vorteilhafte Weise gegenüber dem Stanzen einen deutlich reduzierten Schneidspalt auf, wodurch eine höhere Maßgenauigkeit der Schnittflächen erreicht wird.Such a method advantageously has a significantly reduced cutting gap with respect to stamping, as a result of which a higher dimensional accuracy of the cut surfaces is achieved.

Mit diesem grundsätzlich vorteilhaften Verfahren können jedoch auf nachteilige Weise nur Werkstücke feingeschnitten werden, deren Schnittflächen senkrecht zur Blechebene liegen, dadurch sind zwar Geradverzahnungen herstellbar, nicht aber die im Bereich der Laufverzahnung bedeutenderen Schrägverzahnungen.With this basically advantageous method, however, only workpieces whose cut surfaces are perpendicular to the plane of the sheet can be finely cut in a detrimental manner, as a result of which straight toothings can be produced, but not the more important helical toothings in the area of the running gear.

Die Aufgabe der Erfindung besteht deshalb darin, ein neues Verfahren zum Feinschneiden von Werkstücken, wie Zahnräder od. dgl., zu schaffen, welches einen größeren Einsatzbereich aufweist.The object of the invention is to provide a new method for fine cutting of workpieces, such as gears od. Like., Which has a wider range of applications.

Die Lösung der Aufgabe ergibt sich aus den Merkmalen des Anspruchs 1, wonach während des Schnittvorganges zumindest der Schneidstempel eine vertikale Relativbewegung und gleichzeitig eine rotative Relativbewegung in Bezug zur Schneidplatte vollzieht.The solution of the problem arises from the features of claim 1, wherein at least the cutting punch performs a vertical relative movement and at the same time a rotary relative movement with respect to the cutting plate during the cutting process.

Das erfindungsgemäße Verfahren zum Feinschneiden hat den grundsätzlichen Vorteil, dass der Einsatzbereich des Feinschneidens auch auf Werkstücke erweitert wird, deren Schnittflächen nicht senkrecht zur Blechebene verlaufen, wodurch es beispielsweise möglich wird, die immer wichtiger werdenden Schrägverzahnungen herzustellen. Da in der Vergangenheit nur die zeitintensive zerspanende Herstellung von Schrägverzahnungen möglich war, ermöglicht das erfindungsgemäße Verfahren nicht nur eine erhebliche Erweiterung des Einsatzbereiches des Feinschneidens, sondern auch eine deutlich günstigere Herstellung von Schrägverzahnungen.The inventive method for fine blanking has the fundamental advantage that the application of fineblanking is extended to workpieces whose cut surfaces are not perpendicular to the sheet plane, making it possible, for example, to produce the increasingly important helical gears. Since only the time-consuming machining production of helical gears was possible in the past, the inventive method not only allows a significant expansion of the application of fineblanking, but also a much cheaper production of helical gears.

Um eine schräge Verzahnung aus einem Blechstreifen zu schneiden, ist es erfindungsgemäß erforderlich, dass die Schneidbewegung nicht senkrecht, sondern schräg durch das Blech geführt wird. Im Falle eines schrägverzahnten Stirnlaufrades bedeutet das die Überlagerung der senkrechten Schneidbewegung mit einer Rotation der Schneidelemente zueinander. Diese Rotation kann grundsätzlich auf zwei Arten erzeugt werden, nämlich entweder durch eine Drehung von Schneid- und Führungsplatte bei drehfester Position von Stempel und Gegenhalter oder durch eine Drehung von Stempel und Gegenhalter bei drehfester Lage von Schneid- und Führungsplatte, weil für die Erzeugung der Schrägverzahnung einzig und allein die Relativbewegung zwischen Schneidplatte und Stempel von Bedeutung ist. Zwar ist erfindungsgemäß die Rotationsbewegung durch Schneidstempel und Gegenhalter als bevorzugt anzusehen, jedoch umfasst das erfindungsgemäße Verfahren auch die oben dargelegte andere Möglichkeit.In order to cut an oblique toothing of a metal strip, it is according to the invention required that the cutting movement is not performed vertically, but obliquely through the sheet. In the case of a helical Stirnlaufrades means that is the superposition of the vertical cutting movement with a rotation of the cutting elements to each other. This rotation can be generated in principle in two ways, namely either by rotation of the cutting and guide plate in the rotationally fixed position of the punch and counter-holder or by a rotation of the punch and counter-holder in the rotationally fixed position of cutting and guide plate, because for the generation of helical gearing only the relative movement between insert and punch is important. Although the rotational movement by cutting punch and counter-holder is to be considered as preferred according to the invention, the method according to the invention also encompasses the other option set out above.

Aus dem heterogenen Stand der Technik, nämlich dem italienischen Patent 1137113 des Erfinders Luigi Belcredi ist bereits ein Verfahren bekannt, bei dem ein Schrägstirnrad feingeschnitten wird, jedoch weist dieses Verfahren grundsätzliche Unterschiede auf.From the heterogeneous state of the art, namely the Italian patent 1137113 The inventor Luigi Belcredi already discloses a method in which a helical gear is finely cut, but this method has fundamental differences.

Im Gegensatz zum erfindungsgemäßen Verfahren können die schrägverzahnten Zahnräder nicht direkt aus einem Blechstreifen geschnitten werden, sondern es müssen vorher Blechrohlinge (Platinen) erstellt werden, deren Außendurchmesser den späteren Kopfkreisdurchmesser des Schrägstirnrads aufweisen. Durch einen im Schneidstempel angeordneten rechteckigen Stift wird die eine entsprechende Öffnung aufweisende Platine drehfest an der Unterseite des Schneidstempels fixiert. Nach dem Einklemmen der Platine zwischen Schneidstempel und Abstreifer wird der Schneidvorgang eingeleitet. Dabei wird der Schneidstempel mit darunter angeordneter Platine nach unten gedrückt. Mit der Hilfe einer in den Schneidstempel und den Abstreifer sowie in die Führung und die Matrize eingebrachten Schrägverzahnung werden der Schneidstempel einschließlich Platine zu einer Rotation gezwungen. Dadurch werden aus den Platinen während der Rotation die Zahnzwischenräume herausgeschnitten.In contrast to the method according to the invention, the helical gears can not be cut directly from a sheet metal strip, but it must previously sheet blanks (boards) are created, the outer diameter have the later tip diameter of the helical gear. By means of a rectangular pin arranged in the cutting punch, the board having a corresponding opening is fixed against rotation on the underside of the cutting punch. After clamping the board between the punch and scraper, the cutting process is initiated. The cutting punch is pressed down with the board arranged underneath. With the help of an introduced into the cutting punch and the scraper and in the guide and the die helical teeth of the cutting punch including board forced to a rotation. As a result, the interdental spaces are cut out of the boards during the rotation.

Bei einer vorteilhaften Ausführungsform des erfindungsgemäßen Verfahrens vollzieht während des Schnittvorganges auch der Gegenhalter eine vertikale Relativbewegung und gleichzeitig eine rotative Relativbewegung im Bezug zur Schneidplatte.In an advantageous embodiment of the method according to the invention during the cutting process and the counter-holder performs a vertical relative movement and at the same time a rotary relative movement in relation to the cutting plate.

Durch diese übereinstimmende Rotation von Schneidstempel und Gegenhalter verbessert sich die geometrische Genauigkeit des schrägverzahnten Werkstückes.By this coincident rotation of the punch and counter holder, the geometric accuracy of the helical workpiece improves.

Bei einer besonders bevorzugten Ausführungsform des erfindungsgemäßen Verfahrens weisen Schneidstempel und Gegenhalter vor dem Feinschneiden eine Position zueinander auf, bei der die Verlängerung der jeweiligen Schnittflächen übereinander liegen und sich Schneidstempel und Gegenhalter während des Feinschneidens im Hinblick auf ihre Rotation synchron bewegen.In a particularly preferred embodiment of the method according to the invention, the cutting punch and counter-holder before fine cutting a position to each other, in which the extension of the respective cutting surfaces are superimposed and move punch and counter-holder during fine cutting in terms of their rotation synchronously.

Durch dieses Zusammenwirken von Schneidstempel und Gegenhalter wird zusätzlich die Qualität der erstellten Schnittflächen insbesondere in dem dem Gegenhalter naheliegenden Werkstückbereich deutlich verbessert, da der Gegenhalter bezüglich des Werkstücks während des Schnittvorgangs eine verbesserte Stützfunktion aufweist.In addition, the quality of the created cut surfaces, in particular in the workpiece area close to the counter-holder, is significantly improved by this interaction between the punch and the counter-holder, since the counter-holder has an improved support function with respect to the workpiece during the cutting process.

Des Weiteren betrifft die Erfindung gemäß Anspruch 4 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.Furthermore, the invention according to claim 4 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 means for positive guidance, a pressure plate and a cutting plate , in which a counterpart is led, whereby between the press plate and the cutting plate a plate is held immovable.

Ausgehend von dem oben dargelegten Stand der Technik besteht die Aufgabe der Erfindung darin, eine Vorrichtung zu schaffen, die einen erweiterten Einsatzbereich bei der Herstellung von Werkstücken mittels der Feinschneidtechnik aufweist.Based on the above-described prior art, the object of the invention is to provide a device which has an extended application range in the production of workpieces by means of the fine blanking technique.

Die Lösung der Aufgabe ergibt sich aus den Merkmalen des Anspruchs 4, wonach zumindest der Schneidstempel und die Schneidplatte relativ zueinander drehbar angeordnet sind und dass der Schneidstempel mit im Winkel zur vertikalen Bewegungsrichtung des Schneidstempels angeordneten Schneidflächen versehen ist.The solution of the problem arises from the features of claim 4, according to which at least the cutting punch and the cutting plate are rotatably arranged relative to each other and that the cutting punch is provided with arranged at an angle to the vertical direction of movement of the cutting punch cutting surfaces.

Der wesentliche erfindungsgemäße Vorteil der neuen Vorrichtung zum Feinschneiden besteht nunmehr darin, dass mit dieser auch Schnittflächen erstellt werden können, die nicht senkrecht zur Blechebene angeordnet sind. Dadurch besteht nun die Möglichkeit, den Einsatzbereich des Feinschneidens beispielsweise auf die immer wichtiger werdenden Schrägverzahnungen zu erweitern.The essential advantage of the new apparatus for fineblanking according to the invention now consists in the fact that it can also be used to create cut surfaces which are not arranged perpendicular to the sheet plane. As a result, it is now possible to expand the field of application of fineblanking, for example, to the increasingly important helical gears.

Vorrichtungsgemäß ist es von Vorteil, wenn wie bei einer weiteren Ausführungsform auch der Gegenhalter und die Schneidplatte relativ zueinander drehbar angeordnet sind sowie eine zum Schneidstempel analog ausgebildete Schneidkontur sowie Schneidflächen aufweisen. Durch diese Ausbildung des Feinschneidwerkzeuges erhöht sich die geometrische Genauigkeit der Werkstücke deutlich.According to the device, it is advantageous if, as in a further embodiment, the counter-holder and the cutting plate are rotatably arranged relative to one another and have a cutting contour of analogous design to the cutting punch and cutting surfaces. By this design of fineblanking tool, the geometric accuracy of the workpieces increases significantly.

Bei einer besonders bevorzugten Ausführungsform sind der Schneidstempel und der Gegenhalter drehbar gelagert und die Pressplatte und die Schneidplatte umdrehbar, jedoch vertikal beweglich gelagert.In a particularly preferred embodiment, the cutting punch and the counter-holder are rotatably mounted and the Press plate and the cutting plate reversible, but mounted vertically movable.

Eine zusätzliche Einrichtung zur Synchronisation von Schneidstempel und Gegenhalter hinsichtlich ihrer Schneidlinien sowie der Rotationsgeschwindigkeit während des Feinschneidens weist eine besonders bevorzugte Ausführungsform der Erfindung auf. Hierdurch wird das Zusammenwirken von Schneidstempel und Gegenhalter während des Schneidvorgangs verbessert, so dass die Qualität der erstellten Schnittflächen insbesondere in dem dem Gegenhalter naheliegenden Werkstückbereich größer ist, da der Gegenhalter bezüglich des Werkstücks während des Schneidvorgangs eine verbesserte 4Stützfunktion aufweist.An additional device for the synchronization of cutting punch and counter-holder with respect to their cutting lines and the rotational speed during fine cutting has a particularly preferred embodiment of the invention. This improves the interaction of the cutting punch and the counter-holder during the cutting process, so that the quality of the created cut surfaces is greater, in particular in the workpiece area close to the counter-holder, since the counter-holder has an improved support function relative to the workpiece during the cutting process.

Letztlich weist der Schneidstempel bei einer weiteren Ausführungsform der Erfindung einen Stempelfuß aus, 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.Finally, in another embodiment of the invention, the cutting punch has a punch 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 spike 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, there is a pure shear in the shearing zone during the cutting process, whereby completely smooth cut 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 Fstößei belastet wird.Furthermore one recognizes in the Fig. 1 That the cutting punch A with the plunger force F ST, the sheet metal strip G with the annular toothed force F R, the counter-holder C with the counter-holder force F G and the cutting insert B is charged with the plunger force F stößei.

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 is also guided by means of a helical toothing 16 b of the cutting plate 15. 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 beginning of a cutting process, it is imperative that the cutting punch 11 and counter-holder 14 with their respective helical gears 13 and 16 a position to each other assume 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 pressure medium already in a suitably biased reservoir to the press for Available. 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 (10)

  1. A method for the precision blanking of workpieces, such as toothed wheels or the like, in which the material, preferably metal sheet, is clamped at least between a pressing plate and a cutting plate (15), and a cutting punch (11) is constrainedly guided by means of a means for guidance and the workpiece is cut out by means of a cutting contour and cutting surfaces of the cutting punch (11) and by means of a counter-support (14) acting in the opposite direction and guided in the cutting plate (15), characterised in that during the cutting operation at least the cutting punch (11) executes a vertical relative movement and simultaneously a rotary relative movement in relation to the cutting plate (15).
  2. A method according to Claim 1, characterised in that during the cutting operation the counter-support (14) also executes a vertical relative movement and simultaneously a rotary relative movement in relation to the cutting plate (15).
  3. A method according to Claim 1 or 2, characterised in that the cutting punch (11) and counter-support (14), before the precision blanking, have a position relative to each other in which the extensions of the respective cutting surfaces lie one above the other and in that the cutting punch (11) and counter-support (14) during the precision blanking move synchronously with regard to their rotation.
  4. A device (10) 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), characterised in that at least the cutting punch (11) and the cutting plate (15) are arranged rotatably relative to each other, and in that the cutting punch (11) is provided with cutting surfaces arranged at an angle to the vertical direction of movement of the cutting punch (11).
  5. A device according to Claim 4, 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.
  6. A device according to Claim 4 or 5, 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 movably.
  7. A device according to one of Claims 4 to 6, characterised by a means for synchronisation of the cutting punch (11) and counter-support (14) with regard to their cutting lines and the speed of rotation during the precision blanking.
  8. A device according to one of Claims 4 to 7, characterised in that the cutting punch (11) has a punch foot (22) which is rotatably mounted in a pressure space (21) which is filled with hydraulic fluid.
  9. A device according to Claim 8, characterised in that the pressure space (21) is closed by a non-return valve.
  10. A device according to one of Claims 4 or 9, characterised 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
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
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
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 true EP2208552B1 (en) 2011-04-13
EP2208552B2 EP2208552B2 (en) 2014-06-04

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EP09000652.9A Active EP2208552B2 (en) 2009-01-19 2009-01-19 Method and device for fine cutting of workpieces

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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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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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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
BR112015000346A2 (en) * 2012-07-06 2017-06-27 Yield Force S L printing 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

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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
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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
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Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
EP2208552B2 (en) 2014-06-04
PL2208552T5 (en) 2014-10-31
SI2208552T2 (en) 2014-09-30
DE502009000546D1 (en) 2011-05-26
ATE505278T1 (en) 2011-04-15
ES2361140T5 (en) 2014-08-12
SI2208552T1 (en) 2011-08-31
EP2208552A1 (en) 2010-07-21
PL2208552T3 (en) 2011-09-30
ES2361140T3 (en) 2011-06-14

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