EP1153735B1 - Punch for rotary press - Google Patents

Punch for rotary press Download PDF

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Publication number
EP1153735B1
EP1153735B1 EP00126657A EP00126657A EP1153735B1 EP 1153735 B1 EP1153735 B1 EP 1153735B1 EP 00126657 A EP00126657 A EP 00126657A EP 00126657 A EP00126657 A EP 00126657A EP 1153735 B1 EP1153735 B1 EP 1153735B1
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EP
European Patent Office
Prior art keywords
punch
bore
insert
holder
projection
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
Application number
EP00126657A
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German (de)
French (fr)
Other versions
EP1153735A2 (en
EP1153735A3 (en
Inventor
Ulrich Arndt
Andreas Arning
Heinrich Behrmann
Helmut Bommrowitz
Thomas Heinrich
Jürgen Hinzpeter
Thomas Jacob
Peter Lüneburg
Nils Petersen
Hans-Joachim Pierags
Jürgen Schikowski
Elke Wittenberg
Hans Wolf
Ulrich Zeuschner
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Fette GmbH
Original Assignee
Fette GmbH
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Application filed by Fette GmbH filed Critical Fette GmbH
Publication of EP1153735A2 publication Critical patent/EP1153735A2/en
Publication of EP1153735A3 publication Critical patent/EP1153735A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/06—Platens or press rams
    • B30B15/065—Press rams

Definitions

  • the invention relates to a stamp for a rotary press after the Preamble of claim 1.
  • Rotary presses are known to upper and lower punches, which in corresponding Piston guides of the rotor are guided axially and with die holes interact with the die plate.
  • the actuation of the stamp takes place with the help of stationary cams.
  • the pressing process, with the punches is performed, is effected by pressure rollers, against which the punches start and press the stamp down or up for the purpose of compression of the filled in the die holes powdery material.
  • stamp insert forms the actual Preßtechnikmaschine and thus determines the contour of the compact.
  • the invention has for its object to provide a stamp for rotary presses create, in which for a relative rotation opposite to the pressed tablet a separate drive can be dispensed with.
  • the approach of the punch insert between axially spaced Plugs guided helically in the bore and from a spring to Pretensioned front face of the punch holder At the beginning of a pressing process the punch insert moves into the punch holder up to a fixed one Attack. During this axial movement simultaneously finds a limited rotational movement the stamp insert instead. After pressing, the punch is raised, and the spring returns the punch insert to the home position. The punch insert performs a rotation and thus causes a release of the tablet.
  • One according to one embodiment of the invention is that rotatably connected to the free end of the neck a threaded spindle and in the bore a spindle nut is arranged rotationally fixed, with which the threaded spindle interacts.
  • the spindle nut can according to another embodiment be fixed by means of radial pins in the punch holder of the invention.
  • the Approach of the punch insert points to a further embodiment of the invention at least one radial pin, which engages in a groove of the punch holder, wherein the groove is dimensioned so that it the axial movement of the punch insert allows.
  • the pin can according to another embodiment of the invention, the end a radial pin, through which the spindle in a bore of the neck is fixed.
  • the angle of rotation is z. B. 10 to 30 °, preferably about 20 °.
  • the single FIGURE shows a section through a stamp according to the invention.
  • the punch has a punch shaft or punch holder 10 with a head 12, in a known manner with pressure rollers of the not shown Concentric press cooperates.
  • the punch holder 10 is not in holes shown punch guide axially guided and by a wedge 14 at a rotation prevented.
  • a punch insert 16 At the lower end of the punch holder 10 is a punch insert 16 to detect. It consists of an approximately cylindrical tool section 18, a pin-shaped cylindrical projection 20 and a threaded spindle 22.
  • An the head 12 opposite end of the punch holder is a stepped Bore shaped. In the first bore section with the largest diameter is the approach 20 slidably guided.
  • a spindle nut 24 is arranged, with the help of two opposite radial pins 26, 28 in the bore portion axially and set against rotation.
  • the threaded spindle 22 interacts with the nut 24 together.
  • a helical compression spring 30 is arranged, which rests on the bottom of the bore and on the spindle 22 acts and biases this away from the head 12.
  • the protruding sections are arranged in radial slots 34 and 36 of the punch holder 10, wherein the width the slots 34, 36 is significantly larger than the diameter of the pin 32nd
  • a sleeve 38 is attached, which is the Slits 34, 36 covers and partially over the tool portion 16th extends.
  • the latter has received in an annular groove an O-ring 40, the sealing cooperates with the inside of the sleeve 36. This prevents that Penetrate impurities.
  • the dimensions described are such that the pin 32 is not at the top the slots 34, 36 strikes; before it comes to the plant of the surfaces 42 and 44th together.
  • the pin 32 therefore only has to absorb the force of the spring 30 or the impact generated when the pin on the underside of the slots 34, 36 arrives at the plant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automatic Assembly (AREA)
  • Press Drives And Press Lines (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

Die Erfindung bezieht sich auf einen Stempel für eine Rundlaufpresse nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a stamp for a rotary press after the Preamble of claim 1.

Rundlaufpressen weisen bekanntlich Ober- und Unterstempel auf, die in entsprechenden Stempelführungen des Rotors axial geführt sind und mit Matrizenbohrungen der Matrizenscheibe zusammenwirken. Die Betätigung der Stempel erfolgt mit Hilfe von stationären Steuerkurven. Der Preßvorgang, der mit den Stempeln durchgeführt wird, wird durch Druckrollen bewirkt, gegen welche die Stempel anlaufen und die die Stempel nach unten bzw. nach oben drücken zwecks Zusammenpressung des in die Matrizenbohrungen eingefüllten pulverförmigen Materials.Rotary presses are known to upper and lower punches, which in corresponding Piston guides of the rotor are guided axially and with die holes interact with the die plate. The actuation of the stamp takes place with the help of stationary cams. The pressing process, with the punches is performed, is effected by pressure rollers, against which the punches start and press the stamp down or up for the purpose of compression of the filled in the die holes powdery material.

Es ist bekannt, die Stempel aus zwei Teilen zu formen, nämlich aus einem schaftartigen Halter, der mit den Druckrollen zusammenwirkt, und einem Einsatz, der lösbar mit dem Stempelhalter verbindbar ist. Der Stempeleinsatz bildet das eigentliche Preßwerkzeug und bestimmt mithin die Kontur des Preßlings.It is known to form the stamp from two parts, namely a shaft-like Holder, which cooperates with the pressure rollers, and an insert, the detachable can be connected to the punch holder. The stamp insert forms the actual Preßwerkzeug and thus determines the contour of the compact.

Aus DE-GM 88 16 064 ist eine Rundlaufpresse bekannt geworden, bei der der Schaft der Preßstempel eine Verzahnung aufweist, die mit einer stationär angeordneten Zahnstange zusammenwirkt. Durch die Drehbewegung von Ober- und Unterstempel unmittelbar nach dem Preßvorgang und während des Herauszziehens der Stempel aus der Matrizenbohrung soll eine Trennung von der Oberfläche der gepreßten Tablette erreicht werden.From DE-GM 88 16 064 a rotary press has become known in which the Shaft of the ram has a toothing arranged with a stationary Rack interacts. By the rotation of upper and lower punch immediately after the pressing process and during the extraction of the Stamp from the die hole should be a separation from the surface of the be reached pressed tablet.

Aus EP 0 448 190 ist eine Rundlaufpresse bekannt geworden, bei der Ober- und Unterstempel in Buchsen geführt sind, die ihrerseits drehbar gelagert und verzahnt sind, um mit einer stationären Verzahnung zusammen zu wirken. Die Stempelschäfte sind in den Buchsen linear geführt. Um den Verschleiß an den Druckrollen bzw. an den zugekehrten Köpfen der Köpfe zu reduzieren, ist auch bekannt geworden, die Stempel zweiteilig auszuführen und gegeneinander drehbar zu gestalten. Der getriebemäßige Antrieb findet nunmehr nur auf den unteren Stempelteil statt, der, wie gesagt, gegenüber dem oberen verdrehbar ist.From EP 0 448 190 a rotary press has become known in the upper and Lower stamps are guided in bushings, which in turn rotatably mounted and toothed are to interact with a stationary gearing. The stamp shafts are linearly guided in the sockets. To reduce the wear on the pressure rollers or on the facing heads of the heads, it has also become known make the stamp in two parts and rotate against each other. The geared drive now takes place only on the lower punch part, which, as I said, opposite the top is rotatable.

Der Erfindung liegt die Aufgabe zugrunde, einen Stempel für Rundlaufpressen zu schaffen, bei dem für eine Relativdrehung gegenüber der gepreßten Tablette auf einen separaten Antrieb verzichtet werden kann.The invention has for its object to provide a stamp for rotary presses create, in which for a relative rotation opposite to the pressed tablet a separate drive can be dispensed with.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Erfindungsgemäß ist der Ansatz des Stempeleinsatzes zwischen axial beabstandeten Anschlägen schraubenlinienförmig in der Bohrung geführt und von einer Feder zur Stirnfläche des Stempelhalters hin vorgespannt. Zu Beginn eines Preßvorgangs bewegt sich der Stempeleinsatz in den Stempelhalter hinein bis zu einem festen Anschlag. Während dieser Axialbewegung findet gleichzeitig eine begrenzte Drehbewegung des Stempeleinsatzes statt. Nach dem Pressen wird der Stempel angehoben, und die Feder stellt den Stempeleinsatz in die Ausgangsposition zurück. Dabei führt der Stempeleinsatz eine Drehung aus und bewirkt somit ein Lösen von der Tablette.According to the invention, the approach of the punch insert between axially spaced Plugs guided helically in the bore and from a spring to Pretensioned front face of the punch holder. At the beginning of a pressing process the punch insert moves into the punch holder up to a fixed one Attack. During this axial movement simultaneously finds a limited rotational movement the stamp insert instead. After pressing, the punch is raised, and the spring returns the punch insert to the home position. The punch insert performs a rotation and thus causes a release of the tablet.

Es sind verschiedene konstruktive Lösungen denkbar, einen Stempel der beschriebenen Art zu realisieren. Eine besteht nach einer Ausgestaltung der Erfindung darin, daß mit dem freien Ende des Ansatzes eine Gewindespindel drehfest verbunden und in der Bohrung eine Spindelmutter drehfest angeordnet ist, mit der die Gewindespindel zusammenwirkt. Die Spindelmutter kann nach einer weiteren Ausgestaltung der Erfindung mit Hilfe von radialen Stiften im Stempelhalter festgelegt sein. Der Ansatz des Stempeleinsatzes weist nach einer weiteren Ausgestaltung der Erfindung mindestens einen radialen Zapfen auf, der in einer Nut des Stempelhalters eingreift, wobei die Nut so bemessen ist, daß sie die Axialbewegung des Stempeleinsatzes zuläßt. Der Zapfen kann nach einer weiteren Ausgestaltung der Erfindung das Ende eines radialen Stiftes sein, durch den die Spindel in einer Bohrung des Ansatzes festgelegt ist. There are various constructive solutions conceivable, a stamp of the described Kind of realization. One according to one embodiment of the invention is that rotatably connected to the free end of the neck a threaded spindle and in the bore a spindle nut is arranged rotationally fixed, with which the threaded spindle interacts. The spindle nut can according to another embodiment be fixed by means of radial pins in the punch holder of the invention. Of the Approach of the punch insert points to a further embodiment of the invention at least one radial pin, which engages in a groove of the punch holder, wherein the groove is dimensioned so that it the axial movement of the punch insert allows. The pin can according to another embodiment of the invention, the end a radial pin, through which the spindle in a bore of the neck is fixed.

Zur wirksamen Übertragung der Preßkraft vom Stempelhalter auf den Stempeleinsatz ist nach einer Ausgestaltung der Erfindung vorgesehen, daß die Axialbewegung des Stempeleinsatzes durch ihre Anlage an der Stirnfläche des Stempelhalters begrenzt ist.For effective transfer of the pressing force from the punch holder on the punch insert is provided according to an embodiment of the invention that the axial movement the punch insert by their contact with the end face of the punch holder is limited.

Für das wirksame Lösen der Stempelfläche von der Oberfläche der gepreßten Tablette ist ausreichend, wenn eine relative Drehbewegung über einen beschränkten Drehwinkel stattfindet. Der Drehwinkel beträgt z. B. 10 bis 30°, vorzugsweise etwa 20°.For effective release of the stamp surface from the surface of the pressed Tablet is sufficient if a relative rotational movement over a limited Angle of rotation takes place. The angle of rotation is z. B. 10 to 30 °, preferably about 20 °.

Die Erfindung wird nachfolgend anhand eines in einer Zeichnung dargestellten Ausführungsbeispiels näher erläutert.The invention will be described below with reference to an embodiment shown in a drawing explained in more detail.

Die einzige Figur zeigt einen Schnitt durch einen Stempel nach der Erfindung.The single FIGURE shows a section through a stamp according to the invention.

In der Zeichnung weist der Stempel einen Stempelschaft oder Stempelhalter 10 auf mit einem Kopf 12, der in bekannter Weise mit Druckrollen der nicht gezeigten Rundlaufpresse zusammenwirkt. Der Stempelhalter 10 ist in Bohrungen der nicht gezeigten Stempelführung axial geführt und durch einen Keil 14 an einer Drehung gehindert. Am unteren Ende des Stempelhalters 10 ist ein Stempeleinsatz 16 zu erkennen. Er besteht aus einem annähernd zylindrischen Werkzeugabschnitt 18, einem zapfenförmigen zylindrischen Ansatz 20 und einer Gewindespindel 22. An dem dem Kopf 12 gegenüberliegenden Ende des Stempelhalters ist eine gestufte Bohrung geformt. Im ersten Bohrungsabschnitt mit dem größten Durchmesser ist der Ansatz 20 gleitend geführt. In einem weiteren Bohrungsabschnitt etwas kleineren Durchmessers ist eine Spindelmutter 24 angeordnet, die mit Hilfe von zwei aneinander gegenüberliegenden radialen Stiften 26, 28 im Bohrungsabschnitt axial und gegen Drehung festgelegt ist. Die Gewindespindel 22 wirkt mit der Mutter 24 zusammen. In einem letzten Bohrungsabschnitt noch kleineren Durchmessers ist eine Schraubendruckfeder 30 angeordnet, die am Boden der Bohrung anliegt und auf die Spindel 22 wirkt und diese vom Kopf 12 fort vorspannt.In the drawing, the punch has a punch shaft or punch holder 10 with a head 12, in a known manner with pressure rollers of the not shown Concentric press cooperates. The punch holder 10 is not in holes shown punch guide axially guided and by a wedge 14 at a rotation prevented. At the lower end of the punch holder 10 is a punch insert 16 to detect. It consists of an approximately cylindrical tool section 18, a pin-shaped cylindrical projection 20 and a threaded spindle 22. An the head 12 opposite end of the punch holder is a stepped Bore shaped. In the first bore section with the largest diameter is the approach 20 slidably guided. In a further bore section a little smaller Diameter, a spindle nut 24 is arranged, with the help of two opposite radial pins 26, 28 in the bore portion axially and set against rotation. The threaded spindle 22 interacts with the nut 24 together. In a final bore section of even smaller diameter a helical compression spring 30 is arranged, which rests on the bottom of the bore and on the spindle 22 acts and biases this away from the head 12.

Durch den Ansatz 20 erstreckt sich radial ein zylindrischer Stift 32, der an beiden Seiten des Ansatzes 20 zapfenförmig übersteht. Die überstehenden Abschnitte sind in radialen Schlitzen 34 bzw. 36 des Stempelhalters 10 angeordnet, wobei die Breite der Schlitze 34, 36 deutlich größer ist als der Durchmesser des Stiftes 32.Through the projection 20 extends radially a cylindrical pin 32, which at both Pages of the approach 20 peg-shaped protrudes. The protruding sections are arranged in radial slots 34 and 36 of the punch holder 10, wherein the width the slots 34, 36 is significantly larger than the diameter of the pin 32nd

Am unteren Ende des Stempelhalters 10 ist eine Hülse 38 angebracht, welche die Schlitze 34, 36 überdeckt und sich teilweise über den Werkzeugabschnitt 16 erstreckt. Letzterer hat in einer Ringnut einen O-Ring 40 aufgenommen, der dichtend mit der Innenseite der Hülse 36 zusammenwirkt. Dadurch wird verhindert, daß Verunreinigungen eindringen. At the lower end of the punch holder 10, a sleeve 38 is attached, which is the Slits 34, 36 covers and partially over the tool portion 16th extends. The latter has received in an annular groove an O-ring 40, the sealing cooperates with the inside of the sleeve 36. This prevents that Penetrate impurities.

In der Zeichnung ist der Zustand des Stempels dargestellt, der eingenommen wird, wenn kein Preßvorgang stattfindet. Während des Preßvorgangs kommt der Werkzeugabschnitt 18 mit dem zu verpressenden Material in Kontakt. Dadurch wird eine relative Axialkraft zwischen Einsatz 16 und Stempelhalter 10 erzeugt. Der Einsatz wird in Richtung Stempelhalter 10 gedrückt und aufgrund des Zusammenwirkens von Mutter 24 und Spindel 22 gleichzeitig gedreht, bis die obere Schulter 42 des Werkzeugabschnitts mit der zugekehrten Stirnfläche 44 des Stempelhalters 10 zur Anlage gelangt. Dies muß spätestens dann der Fall sein, wenn erhebliche Preßkräfte aufgebaut werden, um die Tablette zu pressen. Beim anschließenden Anheben des Stempelhalters 10 kann über die vorher gespannte Feder 30 der Stempeleinsatz 16 wieder nach unten gedrückt werden. Bei dieser Bewegung findet ebenfalls eine gewisse Drehung des Stempeleinsatzes 16 statt und damit eine Relativdrehung zwischen der Tablette und der zugekehrten Stempelfläche. Dadurch kommt es zu einem Lösen zwischen diesen Teilen auch dann, wenn eine gewisse Verklebung vorher stattgefunden hat.In the drawing, the state of the stamp is shown, which is taken, if no pressing takes place. During the pressing process comes the tool section 18 in contact with the material to be pressed. This will be a relative axial force between insert 16 and punch holder 10 generated. The use is pressed in the direction punch holder 10 and due to the interaction from nut 24 and spindle 22 simultaneously rotated until the upper shoulder 42 of Tool section with the facing end face 44 of the punch holder 10 for Plant arrives. This must be the case at the latest when considerable compressive forces be built to squeeze the tablet. When subsequently lifting the Stamp holder 10 can on the previously biased spring 30 of the punch insert 16th be pressed down again. In this movement also finds one certain rotation of the punch insert 16 instead and thus a relative rotation between the tablet and the facing stamp surface. This happens a release between these parts even if a certain bond previously took place.

Die beschriebenen Abmessungen sind derart, daß der Stift 32 nicht an der Oberseite der Schlitze 34, 36 anschlägt; vorher kommt es zur Anlage der Flächen 42 und 44 aneinander. Der Stift 32 hat daher lediglich die Kraft der Feder 30 aufzunehmen bzw. den Schlag, der erzeugt wird, wenn der Stift an der Unterseite der Schlitze 34, 36 zur Anlage gelangt.The dimensions described are such that the pin 32 is not at the top the slots 34, 36 strikes; before it comes to the plant of the surfaces 42 and 44th together. The pin 32 therefore only has to absorb the force of the spring 30 or the impact generated when the pin on the underside of the slots 34, 36 arrives at the plant.

Claims (8)

  1. A punch for a rotary press, comprising a holder axially supported in a guide bore and a punch insert which is seated in an end-side bore of the punch holder via a trunnion-shaped projection and is adapted to be mounted via releasable fastening means, characterized in that the projection (20) is helically guided in the bore between axially spaced stops and is biased by a spring (30) towards the associated front-end face (44) of the punch holder (10).
  2. The punch according to claim 1, characterized in that that a threaded spindle (22) is connected, in a non-rotary relationship, to the free end of the projection (20) and the bore has disposed therein, in a non-rotary relationship, a spindle nut (24) with which the threaded spindle (22) interacts.
  3. The punch according to claim 2, characterized in that the spindle nut (24) is located via at least one radial pin (26, 28).
  4. The punch according to claim 2 or 3, characterized in that the projection (20) has provided thereon at least one radial trunnion (32) which engages a groove (34, 36) of the die holder (10) wherein said groove is sized so as to allow for an axial motion of the die insert (16).
  5. The punch according to claim 4, characterized in that said trunnion is the end of a radial pin (36) by which the spindle (22) is located in a bore of the projection (20).
  6. The punch according to any one of claims 1 to 5, characterized in that the axial motion of the insert (16) is limited by its abutting action against the front-end face (44) of the die holder (10).
  7. The punch according to any one of claims 1 to 6, characterized in that the angle of rotation of the insert (16) is about 10 to 30°, preferably about 20°.
  8. The punch according to any one of claims 1 to 7, characterized in that a helical spring (30) is disposed in said bore.
EP00126657A 2000-05-11 2000-12-05 Punch for rotary press Expired - Lifetime EP1153735B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10024340A DE10024340C2 (en) 2000-05-11 2000-05-11 Stamp for rotary press
DE10024340 2000-05-11

Publications (3)

Publication Number Publication Date
EP1153735A2 EP1153735A2 (en) 2001-11-14
EP1153735A3 EP1153735A3 (en) 2002-08-07
EP1153735B1 true EP1153735B1 (en) 2005-06-22

Family

ID=7642503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00126657A Expired - Lifetime EP1153735B1 (en) 2000-05-11 2000-12-05 Punch for rotary press

Country Status (4)

Country Link
US (1) US6749416B2 (en)
EP (1) EP1153735B1 (en)
JP (1) JP2001321995A (en)
DE (2) DE10024340C2 (en)

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DE102004051006B4 (en) 2004-10-20 2009-07-02 Fette Gmbh Rotary press
DE102005021923C5 (en) * 2005-05-12 2014-03-13 Fette Compacting Gmbh Method for operating a rotary press and rotary press
CN1951843B (en) * 2005-10-21 2011-09-28 鸿富锦精密工业（深圳）有限公司 Optic element forming device
CN100553924C (en) * 2006-01-18 2009-10-28 鸿富锦精密工业（深圳）有限公司 Forming die for optical element
CN101015947B (en) * 2006-02-10 2011-03-30 鸿富锦精密工业（深圳）有限公司 Mould structure
US8794941B2 (en) 2010-08-30 2014-08-05 Oscomp Systems Inc. Compressor with liquid injection cooling
US9267504B2 (en) 2010-08-30 2016-02-23 Hicor Technologies, Inc. Compressor with liquid injection cooling
GB2486259B (en) * 2010-12-09 2013-01-16 Holland Ltd I Tablet pressing
US20130025559A1 (en) * 2011-06-10 2013-01-31 Honda Motor Co., Ltd. High pressure die casting flash containment system
JP5220943B1 (en) * 2012-08-13 2013-06-26 伊藤工具株式会社 Mold mold for compression molding
JP6265403B1 (en) * 2017-10-17 2018-01-24 伊藤工具株式会社 Mold mold for compression molding
CN108000929A (en) * 2017-12-11 2018-05-08 上海天和制药机械有限公司 A kind of rotation table device of rotary tablet machine
DE102019104676A1 (en) * 2019-02-25 2020-08-27 GTE General Tool Engineering GmbH Tableting punch, tabletting arrangement consisting of upper punch and lower punch and die as well as a pressing process for the tabletting arrangement

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Also Published As

Publication number Publication date
US20010041198A1 (en) 2001-11-15
JP2001321995A (en) 2001-11-20
US6749416B2 (en) 2004-06-15
EP1153735A2 (en) 2001-11-14
DE50010604D1 (en) 2005-07-28
DE10024340A1 (en) 2001-11-29
EP1153735A3 (en) 2002-08-07
DE10024340C2 (en) 2002-09-12

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